阅读说明：本技术 一种球团链箅机散料综合处理的方法及其处理系统 (Method and system for comprehensively treating bulk materials of pellet chain grate machine ) 是由 周志安 景涛 王春林 李康 胡建军 代友训 于 2021-01-05 设计创作，主要内容包括：本发明公开了一种球团链箅机散料综合处理的方法及其处理系统。在单位时间段内,将链箅机产生的散料进行收集、筛分,并检测筛上粗散料的粒径、强度、温度以及含水量,然后通过散料分选数学模型计算获得散料的综合性能指标值筛选出合格散料直接回收至回转窑焙烧处理,而未合格的筛上粗颗粒散料和筛下细颗粒散料则作为造球原配料直接进行造球处理。本发明针对链箅机各段的散料集中收集及处理,实现了球团生产系统内部散料的循环利用,不再外运处置,降低了外运运输成本,降低了料场堆存成本,减少了物料损失成本,减少了杂矿贬值成本,同时还改善了环境,提高了生产效率。(The invention discloses a method and a system for comprehensively treating bulk materials of a pellet chain grate. In unit time quantum, collect, sieve the bulk cargo that the chain grate machine produced to detect particle diameter, intensity, temperature and the water content of coarse bulk cargo on the sieve, then select separately the comprehensive properties index value that mathematical model calculated and obtain the bulk cargo through the bulk cargo and select out qualified bulk cargo and directly retrieve to rotary kiln calcination and handle, and coarse grain bulk cargo on the unqualified sieve and undersize fine particle bulk cargo are then directly carried out the pelletization as the former batching of pelletization and are handled. The bulk cargo collecting and processing device is used for collecting and processing bulk cargo of each section of the chain grate machine in a centralized manner, so that the cyclic utilization of the bulk cargo inside a pellet production system is realized, the bulk cargo is not transported and disposed outside, the transportation cost outside is reduced, the stockyard storage cost is reduced, the material loss cost is reduced, the miscellaneous ore depreciation cost is reduced, the environment is improved, and the production efficiency is improved.)

1. A method for comprehensively treating bulk materials by a pellet chain grate machine is characterized by comprising the following steps: the method comprises the following steps:

1) according to the trend of materials, green pellets enter a chain grate machine (1), sequentially pass through a blast drying section (UDD), an air draft drying section (DDD), a transition preheating section (TPH) and a preheating section (PH) on the chain grate machine (1), and are conveyed into a rotary kiln (2) for oxidizing roasting;

2) collecting bulk materials generated in the process of passing the materials in the step 1) through a chain grate machine (1), and detecting parameter information of particle size, hardness, moisture content and temperature of the bulk materials;

3) establishing a bulk material sorting mathematical model according to the detected parameter information;

4) and calculating to obtain the comprehensive performance index value of the bulk materials through a bulk material sorting mathematical model, and determining the subsequent treatment mode of the part of the bulk materials according to the calculated value of the comprehensive performance index of the bulk materials.

2. The method of claim 1, wherein: the bulk material sorting mathematical model is as follows:

in the formula I, Y is the comprehensive performance index of the bulk material; dc is the detected particle size of the bulk cargo, mm; nc is the detected hardness of the bulk material, N; tc is the detected bulk temperature, DEG C; wc is the detected water content of the bulk material in percentage by mass; dmin is the set minimum particle size of qualified bulk cargo, mm; nmin is the set minimum strength of qualified bulk material, N; tmin is the set minimum temperature of qualified bulk cargo; DEG C; wmax is the maximum water content and mass percentage of the set qualified bulk material; i is the weight index of the particle size of the bulk material; j is the weight index of the hardness of the bulk material; k is the weight index of bulk temperature; r is the weight index of the water content of the bulk material;

preferably, i is 0.2 to 0.4; j is 0.3 to 0.5; k is 0.15 to 0.25; r is 0.01-0.05, and i + j + k + r is 1.

3. The method of claim 2, wherein: the step 4) is specifically as follows:

401) when Y is more than or equal to 1; conveying the part of bulk materials into a rotary kiln (2) for oxidation roasting treatment;

402) when Y is less than 1, the bulk material is used as pelletizing material for pelletizing treatment.

4. The method according to any one of claims 1-3, wherein: in step 2), the bulk material collection specifically comprises: in a unit time period, collecting and screening bulk materials of a forced air drying section (UDD) and an induced draft drying section (DDD) in a centralized manner, and collecting and screening bulk materials of a transition preheating section (TPH) and a preheating section (PH) in a centralized manner; taking all oversize materials as bulk materials to be detected; all the undersize materials are used as pelletizing raw materials to carry out pelletizing treatment;

or, in a unit time period, collecting and screening all bulk materials of a grate blower drying section (UDD), an air draft drying section (DDD), a transition preheating section (TPH) and a preheating section (PH) in a centralized manner; taking all oversize materials as bulk materials to be detected; all the undersize materials are used as pelletizing raw materials to carry out pelletizing treatment;

preferably, the particle size of the oversize material is more than or equal to 5mm, preferably more than or equal to 5.5 mm.

5. The method according to claim 3 or 4, characterized in that: the pelletizing treatment specifically comprises the following steps: firstly, thinning bulk materials serving as pelletizing raw materials, then mixing the bulk materials with other pelletizing raw materials, and finally pelletizing;

preferably, the refining treatment specifically comprises: crushing (for example, crushing to a particle size of 3mm or less, preferably 2mm or less) a bulk material serving as a pelletizing raw material; then carrying out dry grinding treatment (for example, dry grinding until the granularity is less than or equal to 0.074mm accounts for 70-90%, preferably, the granularity is less than or equal to 0.074mm accounts for 75-85%); then carrying out a wetting treatment (for example, spray water treatment to a water content of 7-9%, preferably 8-8.5%); finally, conveying the mixture to a pelletizer (11) for pelletizing;

or, the refining processing specifically includes: crushing (for example, crushing to a particle size of 3mm or less, preferably 2mm or less) a bulk material serving as a pelletizing raw material; then carrying out wet grinding treatment (for example, wet grinding until the particle size reaches 0.074mm or less accounts for 70-90%, preferably until the particle size reaches 0.074mm or less accounts for 75-85%); then filtering the ore pulp, and returning filtrate to continuously participate in wet grinding; the filter cake is conveyed to a pelletizer (11) for pelletizing.

6. A system for the integrated treatment of pellet grate bulk material as claimed in any one of claims 1 to 5, characterized in that: the system comprises a chain grate machine (1), a rotary kiln (2) and a bulk material centralized collection and treatment device (3); the discharge hole of the chain grate machine (1) is communicated with the feed inlet of the rotary kiln (2); the chain grate machine (1) comprises a drying section and a preheating section; the bulk material centralized collection and treatment device (3) is arranged below the drying section and the preheating section of the chain grate machine (1); the discharge end of the bulk material centralized collection and treatment device (3) is connected with a transition bin (6) for materials to be detected; a material particle size detection unit (601), a material hardness detection unit (602), a material temperature detection unit (603) and a material moisture content detection unit (604) are arranged in the material transition bin (6) to be detected.

7. The system of claim 6, wherein: the drying section of the chain grate machine (1) comprises an air blowing drying section (UDD) and an air draft drying section (DDD); the preheating section of the chain grate machine (1) comprises a preheating section (TPH) and a preheating section (PH); the forced air drying section (UDD), the induced draft drying section (DDD), the preheating section (TPH) and the preheating section (PH) are sequentially connected in series; hot air bellows (101) are arranged on two sides of each of the blast drying section (UDD), the draft drying section (DDD), the preheating section (TPH) and the preheating section (PH); a small grid hopper (102) is arranged below each of the blast drying section (UDD), the draft drying section (DDD), the preheating section (TPH) and the preheating section (PH); the bulk material centralized collection and treatment device (3) is positioned below a small grid hopper (102) of a blowing drying section (UDD), an air draft drying section (DDD), a preheating section (TPH) and a preheating section (PH).

8. The system of claim 7: the method is characterized in that: the bulk material centralized collection and treatment device (3) comprises a first conveyor (301), a screening machine (302), a second conveyor (303) and a third conveyor (304); the first conveyor (301) is arranged below the small grid hoppers (102) of the air blowing drying section (UDD), the air draft drying section (DDD), the preheating first section (TPH) and the preheating second section (PH); the screening machine (302) is arranged at the discharge end of the first conveyor (301); the material discharge port on the screen of the screening machine (302) is connected with the material inlet of the material transition bin (6) to be detected through a second conveyor (303); a screen material discharge port of the screening machine (302) is connected with a feed port of the crusher (7) through a third conveyor (304);

or the bulk material centralized collection and treatment device (3) comprises a drying section bulk material collection and treatment device (4) and a preheating section bulk material collection and treatment device (5); the drying section bulk material collecting and processing device (4) is positioned below the small grid hoppers (102) of the air blowing drying section (UDD) and the air draft drying section (DDD); the bulk material collecting and processing device (5) in the preheating section is positioned below the small grid hoppers (102) in the preheating section (TPH) and the preheating section (PH).

9. The system of claim 8, wherein: the drying section bulk material collecting and processing device (4) comprises a first drying section conveyor (401), a drying section screening machine (402), a second drying section conveyor (403) and a third drying section conveyor (404); the first drying section conveyor (401) is arranged below the small grid hoppers (102) of the air blowing drying section (UDD) and the air draft drying section (DDD); the drying section screening machine (402) is arranged at the discharge end of the first drying section conveyor (401); the material discharge port on the screen of the drying section screening machine (402) is connected with the material inlet of the material transition bin (6) to be detected through a second drying section conveyor (403); a screen material discharge port of the drying section screening machine (402) is connected with a feed port of the crusher (7) through a third conveyor (404);

preferably, the preheating section bulk material collecting and processing device (5) comprises a first preheating section conveyor (501), a preheating section screening machine (502), a second preheating section conveyor (503) and a third preheating section conveyor (504); the first preheating section conveyor (501) is arranged below the small grid hoppers (102) of the preheating section (TPH) and the preheating section (PH); the preheating section screening machine (502) is arranged at the discharge end of the first preheating section conveyor (501); the material discharge port on the screen of the preheating section screening machine (502) is connected with the material inlet of the material transition bin (6) to be detected through a second preheating section conveyor (503); and a screen underflow material outlet of the preheating section screening machine (502) is connected with a feed inlet of the crusher (7) through a third conveyor (504).

10. The system of claim 9, wherein: the system also comprises a bucket elevator (8); the feeding end of the bucket elevator (8) is connected with a qualified material discharging opening of the to-be-detected material transition bin (6) through a qualified material conveying pipeline (605); the discharge end of the bucket elevator (8) is connected with the feed inlet of the rotary kiln (2) through a first chute (S1); the non-qualified material discharge port of the material transition bin (6) to be detected is connected with the feed port of the crusher (7) through a non-qualified material conveying pipeline (606);

preferably, the screen holes of the screening machine (302), the drying section screening machine (402) and the preheating section screening machine (502) are all larger than or equal to 5mm, and preferably larger than or equal to 5.5 mm.

11. The system according to claim 9 or 10, characterized in that: the system also comprises a dry grinding machine (9) and/or a wet grinding machine (10) and a buffer bin (11); the feeding hole of the dry mill (9) is connected with the discharging hole of the crusher (7) through a second chute (S2); the discharge outlet of the dry mill (9) is connected with the feed inlet of the buffer bin (11) through a third chute (S3); and/or

The feed inlet of the wet grinder (10) is connected with the discharge outlet of the crusher (7) through a fourth chute (S4); the discharge opening of the wet grinder (10) is connected with the feed opening of the buffer bin (11) through a fifth chute (S5);

preferably, a filter residue discharge hole of the wet grinding machine (10) is connected with a feed hole of the buffer bin (11) through a fifth chute (S5); the filtrate outlet of the wet grinder (10) is connected with the water inlet of the wet grinder (10) through a circulating water pipeline (1001).

12. The system of claim 11, wherein: the system also comprises a pelletizer (12); the feed inlet of the pelletizer (12) is connected with the discharge outlet of the buffer bin (11) through a powder conveying pipeline (1101); the discharge port of the pelletizer (12) is connected with the feed port of the chain grate machine (1) through a green pellet conveying device (13);

preferably, the system further comprises a wetting machine (14); the wetting machine (14) is arranged on a powder conveying pipeline (1101) between the buffer bin (11) and the pelletizer (12); a spray head (1401) is arranged in the inner cavity of the wetting machine (14); the water inlet end of the spray head (1401) is communicated with the water inlet pipe (1402).

13. The system of claim 12, wherein: the system also comprises a sixth chute (S6); the feed inlet of the sixth chute (S6) is connected below the discharge end of the chain grate machine (1); the discharge hole of the sixth chute (S6) is communicated to the feed inlet of the sieving machine (302) or the preheating section sieving machine (502);

preferably, the first conveyor (301), the second conveyor (303), the third conveyor (304), the first preheating section conveyor (501), the second preheating section conveyor (503) and the third preheating section conveyor (504) are all chain scraper conveyors; the first drying section conveyor (401), the second drying section conveyor (403) and the third drying section conveyor (404) are all belt conveyors; and/or

The dry grinding machine (9) is one of a dry disc grinding machine, a dry ball grinding machine and a dry roller grinding machine.

Technical Field

The invention relates to a collecting device for bulk pellets of a chain grate machine, in particular to a method for comprehensively treating bulk pellets of the chain grate machine and a treatment system thereof, and belongs to the field of recovery of bulk pellets of the chain grate machine.

Background

The pellet is a method for artificial block raw material, and is a process for changing powder material into physical property phase and chemical composition which can meet the requirements of next processing step. The pelletizing production process is a production process for refining pellets, and pelletizing and sintering are two common processes for refining iron ore in the iron and steel smelting industry. The pellet ore is prepared by adding a small amount of additive into finely ground iron concentrate powder or other iron-containing powder, mixing, rolling into pellets by a pelletizer under the condition of adding water for wetting, and then drying, roasting and solidifying into the spherical iron-containing raw material with certain strength and metallurgical property.

As shown in fig. 2, in the existing pellet production process, a chain grate-rotary kiln-circular cooler is a relatively mature process, and the chain grate is divided into four sections along the material flow direction: a forced air drying section, an air draft drying section, a preheating section and a preheating section; the two sides of each section are correspondingly provided with hot air bellows. A small grid hopper is arranged below the chain grate machine, and a belt conveyor is arranged below the small grid hopper. Bulk materials accumulated in small grid hoppers below a chain grate machine air blowing drying section, an air draft drying section, a preheating section and a preheating section front section (generally, a third last small grid hopper of a chain grate machine discharging section is lifted to the drying section) and bulk material ash accumulated in hot air blowers on two sides of the bulk materials are conveyed to a bulk material bin through a belt conveyor, and then the bulk materials are periodically conveyed to a raw material yard through an automobile, doped into an iron raw material pile and recycled as iron-containing raw materials. Bulk materials of a chain grate preheating two-section rear section (generally, a penultimate small grid hopper and a penultimate small grid hopper in a small grid hopper at the head part of the chain grate) and bulk materials at the head part of the chain grate and the discharge end of the head part of the chain grate enter a bucket elevator together through a chute, are conveyed to a rotary kiln through the bucket elevator for roasting, and are finally discharged into an annular cooler from the discharge end of the rotary kiln for cooling.

In the actual production of the existing bulk material collecting system of the chain grate machine, the following defects and problems exist:

1) bulk materials are stored in the bulk material ore tank and transported to a stock yard by an automobile to be stockpiled as sintering and homogenizing ingredients, so that the transportation cost is increased: such as stockyard stockpiling cost, material loss cost, miscellaneous ore depreciation cost and the like; the internal recycling of the materials in the pellet mill cannot be realized.

2) Fine dust exists in the bulk cargo, and the dust is serious in the process of transferring and loading, so that the field and the surrounding environment are severe.

3) Wet crushed balls under a sieve of a roller-type distributor of a chain grate machine, which can be mixed in bulk materials, can block after entering a bulk material ore bin, so that the blanking is not smooth.

4) The bucket elevator has no dust removal facility and severe field environment.

5) The temperature of bulk materials close to the preheating second section of the chain grate machine is higher, so that the service life of a conveying belt of the belt conveyor is reduced;

6) bulk cargo is transported and occupies the stock ground place, influences stock ground operating efficiency.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a method for comprehensively treating bulk materials of a pellet chain grate machine and a treatment system thereof. In unit time period, the bulk materials at the drying section and the preheating section of the chain grate machine and at the discharge end of the chain grate machine are collected in a centralized mode, then screening is carried out, the particle size, the strength, the temperature and the water content of coarse bulk materials on a screen are detected, the comprehensive performance index value of the bulk materials is obtained through calculation of a bulk material sorting mathematical model, qualified bulk materials are further screened out and directly recycled to a rotary kiln for roasting treatment, unqualified coarse-particle bulk materials on the screen and undersize fine-particle bulk materials are subjected to crushing, grinding, moistening and the like and then are used as pelletizing raw materials to be directly subjected to pelletizing treatment, the bulk materials are not transported outside, the transportation cost outside is reduced, the stockyard storage cost is reduced, the material loss cost is reduced, the cost of ore impurity value loss is reduced, the environment is improved, and the production efficiency is improved.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

according to a first embodiment of the invention, a method for the integrated treatment of bulk material by a pellet grate machine is provided: the method comprises the following steps:

1) according to the trend of the materials, the green pellets enter a chain grate machine, sequentially pass through a blast drying section, a draft drying section, a transition preheating section and a preheating section on the chain grate machine, and are conveyed into a rotary kiln for oxidizing roasting.

2) Collecting the bulk materials generated in the process of passing the materials in the step 1) through a chain grate machine, and detecting the parameter information of the particle size, the hardness, the moisture content and the temperature of the bulk materials.

3) And establishing a bulk material sorting mathematical model according to the detected parameter information.

4) And calculating to obtain the comprehensive performance index value of the bulk materials through a bulk material sorting mathematical model, and determining the subsequent treatment mode of the part of the bulk materials according to the calculated value of the comprehensive performance index of the bulk materials.

Preferably, the bulk material sorting mathematical model is as follows:

in the formula I, Y is the comprehensive performance index of the bulk material. Dc is the detected particle size of the bulk material, mm. Nc is the detected hardness of the bulk material, N. Tc is the detected bulk temperature, DEG C. And Wc is the detected water content of the bulk material in percentage by mass. Dmin is the set minimum particle size, mm, of the qualified bulk material. Nmin is the set minimum strength, N, of a qualified bulk material. Tmin is the set minimum temperature of qualified bulk cargo, DEG C. Wmax is the maximum water content and mass percentage of the set qualified bulk material. i is a weight index of the particle size of the bulk material. j is a weight index of the hardness of the bulk material. k is the weight index of bulk temperature. r is the weight index of the water content of the bulk material.

Preferably, i is 0.2 to 0.4; j is 0.3 to 0.5; k is 0.15 to 0.25; r is 0.01-0.05, and i + j + k + r is 1.

Preferably, the step 4) is specifically:

401) when Y is more than or equal to 1. And conveying the part of bulk materials to a rotary kiln for oxidation roasting treatment.

402) When Y is less than 1, the bulk material is used as pelletizing material for pelletizing treatment.

Preferably, in step 2), the bulk material is collected specifically as follows: and in unit time period, collecting and screening bulk materials of the forced air drying section and the induced air drying section of the chain grate machine in a centralized manner, and simultaneously collecting and screening bulk materials of the transition preheating section and the preheating section in a centralized manner. And all oversize materials are used as bulk materials to be detected. All the undersize materials are used as pelletizing raw materials to carry out pelletizing treatment.

Or, in unit time period, collecting and screening all bulk materials in the air draft drying section, the transition preheating section and the preheating section of the grate blower drying section in a centralized manner. And all oversize materials are used as bulk materials to be detected. All the undersize materials are used as pelletizing raw materials to carry out pelletizing treatment.

Preferably, the particle size of the oversize material is more than or equal to 5mm, preferably more than or equal to 5.5 mm.

Preferably, the pelletizing treatment specifically comprises: the bulk material as the pelletizing raw material is firstly refined, then is mixed with other pelletizing raw materials, and finally is pelletized.

Preferably, the refining treatment specifically comprises: the bulk material as the pelletizing raw material is first crushed (for example, to a particle size of 3mm or less, preferably 2mm or less). Then, dry-grinding treatment is carried out (for example, dry-grinding is carried out until the particle size is less than or equal to 0.074mm and is 70 to 90%, preferably, the particle size is less than or equal to 0.074mm and is 75 to 85%). Then a moistening treatment (e.g. spray water treatment to a water content of 7-9%, preferably 8-8.5%) is carried out. And finally, conveying the mixture to a pelletizer for pelletizing.

Or, the refining processing specifically includes: the bulk material as the pelletizing raw material is first crushed (for example, to a particle size of 3mm or less, preferably 2mm or less). Then, wet milling treatment is carried out (for example, wet milling is carried out until the particle size is 0.074mm or less in the range of 70 to 90%, preferably 0.074mm or less in the range of 75 to 85%). The pulp is then filtered and the filtrate is returned to continue to participate in the wet milling. And conveying the filter cake to a pelletizer for pelletizing.

According to a second embodiment of the invention, there is provided a system for integrated treatment of a pellet chain grate bulk material or a system for use in the method for integrated treatment of a pellet chain grate bulk material according to the first embodiment: the system comprises a chain grate machine, a rotary kiln and a bulk material centralized collection and treatment device. The discharge hole of the chain grate machine is communicated with the feed inlet of the rotary kiln. The chain grate machine comprises a drying section and a preheating section. The bulk material centralized collection and treatment device is arranged below the drying section and the preheating section of the chain grate machine. The discharge end of the bulk material centralized collection and treatment device is connected with a material transition bin to be detected. And a material particle size detection unit, a material hardness detection unit, a material temperature detection unit and a material moisture content detection unit are arranged in the material transition bin to be detected.

Preferably, the drying section of the chain grate machine comprises an air blowing drying section and an air draft drying section. The preheating section of the chain grate machine comprises a preheating section and a preheating section. The blast drying section, the air draft drying section, the preheating section and the preheating section are sequentially connected in series. And hot air bellows are arranged on two sides of each of the blast drying section, the air draft drying section, the preheating section and the preheating section. And a small-grid hopper is arranged below each of the blast drying section, the air draft drying section, the preheating section and the preheating section. The bulk material centralized collection and treatment device is positioned below the blowing drying section, the air draft drying section and the small grid hoppers of the preheating section and the preheating section.

Preferably, the bulk material centralized collection and treatment device comprises a first conveyor, a screening machine, a second conveyor and a third conveyor. The first conveyor is arranged below the small grid hopper of the blowing drying section, the air draft drying section, the preheating section and the preheating section. The screening machine is arranged at the discharge end of the first conveyor. The material discharge gate on the sieve of screening machine is connected with the feed inlet of waiting to examine the material transition storehouse through the second conveyer. And the undersize material discharge port of the screening machine is connected with the feed port of the crusher through a third conveyor.

Or the bulk material centralized collection and treatment device comprises a drying section bulk material collection and treatment device and a preheating section bulk material collection and treatment device. And the bulk material collecting and processing device in the drying section is positioned below the small grid hoppers in the blowing drying section and the air draft drying section. The bulk material collecting and processing device of the preheating section is positioned below the small grid hoppers of the preheating section and the preheating section.

Preferably, the bulk material collecting and processing device for the drying section comprises a first drying section conveyor, a drying section screening machine, a second drying section conveyor and a third drying section conveyor. The first drying section conveyor is arranged below the small grid hoppers of the air blowing drying section and the air draft drying section. The drying section screening machine is arranged at the discharge end of the first drying section conveyor. The material discharge gate on the sieve of drying section screening machine is connected with the feed inlet of waiting to examine the material transition bin through second drying section conveyer. And a screen material discharge port of the drying section screening machine is connected with a feed port of the crusher through a third conveyor.

Preferably, the preheating section bulk material collecting and processing device comprises a first preheating section conveyor, a preheating section screening machine, a second preheating section conveyor and a third preheating section conveyor. The first preheating section conveyor is arranged below the small grid hoppers of the first preheating section and the second preheating section. The preheating section screening machine is arranged at the discharge end of the first preheating section conveyor. And an oversize material discharge port of the preheating section screening machine is connected with a feed inlet of a material transition bin to be detected through a second preheating section conveyor. And a screen material discharge port of the preheating section screening machine is connected with a feed port of the crusher through a third conveyor.

Preferably, the system further comprises a bucket elevator. The feed end of the bucket elevator is connected with a qualified material discharge port of the material transition bin to be detected through a qualified material conveying pipeline. The discharge end of the bucket elevator is connected with the feed inlet of the rotary kiln through a first chute. The non-qualified material discharge port of the material transition bin to be detected is connected with the feed inlet of the crusher through a non-qualified material conveying pipeline.

Preferably, the screen hole diameters of the screening machine, the drying section screening machine and the preheating section screening machine are all larger than or equal to 5mm, and preferably larger than or equal to 5.5 mm.

Preferably, the system also comprises a dry mill and/or a wet mill and a buffer bin. And the feed inlet of the dry grinding machine is connected with the discharge outlet of the crusher through a second chute. And the discharge port of the dry mill is connected with the feed inlet of the buffer bin through a third chute.

Preferably, the feed inlet of the wet mill is connected with the discharge outlet of the crusher through a fourth chute. And a discharge port of the wet grinder is connected with a feed port of the buffer bin through a fifth chute.

Preferably, the filter residue discharge hole of the wet grinding machine is connected with the feed inlet of the surge bin through a fifth chute. And a filtrate outlet of the wet grinder is connected with a water inlet of the wet grinder through an annular water pipeline.

Preferably, the system further comprises a pelletizer. The feed inlet of the pelletizer is connected with the discharge outlet of the buffer bin through a powder conveying pipeline. The discharge port of the pelletizer is connected with the feed port of the chain grate machine through a green pellet conveying device.

Preferably, the system further comprises a wetting machine. The moistening machine is arranged on a powder conveying pipeline between the buffer bin and the pelletizer. And a spray head is arranged in the inner cavity of the wetting machine. The water inlet end of the spray head is communicated with the water inlet pipe.

Preferably, the system further comprises a sixth chute. And the feed inlet of the sixth chute is connected below the discharge end of the chain grate machine. And a discharge port of the sixth chute is communicated to a feed port of the screening machine or the preheating section screening machine.

Preferably, the first conveyor, the second conveyor, the third conveyor, the first preheating section conveyor, the second preheating section conveyor and the third preheating section conveyor are all chain scraper conveyors. The first drying section conveyor, the second drying section conveyor and the third drying section conveyor are all belt conveyors.

Preferably, the dry mill is one of a dry disc mill, a dry ball mill and a dry roller mill.

In the prior art, bulk materials of a chain grate machine are collected in a mine groove for storage, then the bulk materials are transported to a stock yard by an automobile and stored as sintering and homogenizing materials, so that the transportation cost (stock yard storage cost, material loss cost, miscellaneous ore depreciation cost and the like) is increased, and the internal recycling of materials in a pellet mill cannot be realized. And fine dust still exists in the bulk cargo, and the raise dust is more serious in transportation and loading process, leads to the scene easily and all around the environment is abominable. Secondly, wet crushed balls under a sieve of the roller-type distributor of the chain grate machine can be possibly mixed in the bulk materials, and the situation of blockage can occur after the wet crushed balls enter the bulk material ore bin, so that the blanking is not smooth. And the bucket elevator has no dust removal facility, and the field environment is severe. Further, high temperature bulk material can reduce the service life of the belt conveyor belt due to the higher bulk material temperature near the preheating section (especially the preheating section) of the chain grate machine. Meanwhile, bulk cargo transfer occupies a stock yard site, and the operation efficiency of the stock yard is affected.

In the invention, bulk materials of the chain grate machine are collected and processed in a centralized manner, namely bulk materials of a blowing drying section, an air draft drying section, a preheating section and a discharging end of the chain grate machine are collected and processed by a bulk material centralized collecting and processing device. Generally, the bulk material in the drying section of the chain grate machine has uniform granularity, mainly comprises dust, contains a small part of large-particle materials, has good hydrophilicity and high balling index, has the granularity of 0.1-4 mm, the moisture content of less than 20 percent, the hardness of 9-10N and the temperature of less than 60 ℃ (being suitable for being used as a balling raw material). And the bulk cargo granularity of chain grate machine preheating section is inhomogeneous, and the bulk cargo thickness two-stage differentiation has tiny dust, also has broken balls and the bobble of big granule, and this bulk cargo hydrophilicity is not good, and the balling-up index is lower, and the bulk cargo granularity is 2 ~ 16mm, and the hardness is 500 ~ 800N, temperature 450 ~ 550 ℃ (big granule bulk cargo can be transported back to the rotary kiln calcination, and the bobble bulk cargo is applicable to as pelletizing batching). This system is through concentrating the collection processing with the pelletizing bulk cargo of dry section and preheating section, is favorable to two kinds of bulk cargo intensive mixings on the one hand, gets the strong point and mends the weak point, improves pelletizing performance, adopts one set of equipment to concentrate the collection processing to the bulk cargo simultaneously, and very big saving input cost has also guaranteed production efficiency.

In the invention, in a section time period, bulk materials (mainly bulk materials and dust generated in a hot air bellow and a small grid hopper) of a chain grate machine are conveyed to a screening machine through a conveyor in a centralized manner and then screened to obtain large-particle materials and small-particle materials, wherein the large-particle materials are conveyed to a transition bin of materials to be detected for performance detection (particle size, strength, moisture content, temperature and the like); and conveying the pellets meeting certain performance conditions (meeting the roasting requirement of the rotary kiln) back to the rotary kiln for oxidizing roasting. And conveying the unqualified large-particle materials and the small-particle materials screened by the screening machine to a crusher, then crushing (for example, crushing by a hammer crusher to the particle size of-3 mm) to obtain fine materials, then conveying the crushed fine materials to a wet grinder and/or a dry grinder to perform wet grinding or dry grinding (for example, grinding by a wet grinder and/or a dry disc grinder until the particle size of the materials reaches-0.074 mm, wherein the ratio is 75-80%) to obtain powder, and finally collecting the powder to a buffer bin in a centralized manner to be used as a ball-making raw material for later use. When pelletizing is required, the powder in the buffer bin is firstly conveyed to a wetting machine for wetting (for example, the water content of the powder is 8-8.5% by adopting a water mist spraying mode) so as to improve the pelletizing performance, and then the powder is conveyed to a pelletizer to be pelletized and pelletized together with other iron-containing raw materials. This scheme is through carrying out performance detection with the large granule material and then select the bulk cargo pelletizing that accords with the participation oxidation roasting condition and carry out recovery processing to and recycle unqualified large granule material and tiny particle material as pelletizing raw materials, avoided the waste of qualified bulk cargo in this part bulk cargo on the one hand, and reduced the handling capacity and the treatment cost of follow-up bulk cargo. On the other hand, the base number of the pellet production is at least counted by tons, the amount of the bulk materials generated is considerable, the part of the bulk materials are selectively recycled, the production cost (including the input cost for producing the part of the bulk materials and the increasing cost of post-treatment) can be greatly reduced, and the production efficiency is improved.

In the invention, after wet grinding treatment (for example, wet grinding until the abrasive particle size reaches-0.074 mm accounts for 75-80%), ore pulp is required to be filtered, wherein the filtered filtrate is continuously returned to the wet grinding machine for recycling, the filtered filter cake is conveyed to a buffer bin for later use, and finally conveyed to a batching chamber of a pelletizer to participate in initial batching, and is mixed with concentrate powder or other iron-containing powder with a small amount of additives, and then is rolled into balls by the pelletizer under the condition of adding water for wetting, and is roasted by a drying rotary kiln of a chain grate machine to be consolidated into spherical iron-containing pellets with certain strength and metallurgical performance.

In the invention, a bulk material chute (namely a sixth chute) at the discharge end of the chain grate machine is also included. Typically, part of the bulk material is also produced at the discharge end of the chain grate, and so the feed inlet of the sixth chute is connected below the discharge end of the chain grate. And a discharge hole of the sixth chute is communicated to the sieving machine. The purpose of collecting and processing the part of bulk materials can be realized.

In the invention, a material particle size detection unit, a material hardness detection unit, a material temperature detection unit and a material moisture content detection unit are arranged in the material transition bin to be detected. The material particle size detection unit detects the particle size of the bulk material conveyed to the material transition bin to be detected in unit time period (can detect one by one, and can also detect in a sampling way, for example, a one-level or multi-level sieving machine is adopted to carry out screening selection step by step to obtain one or more groups of bulk materials with different particle size distributions. The material hardness detection unit detects the strength of the bulk material after particle size detection (can detect the bulk material one by one or can detect the bulk material by sampling, for example, a pellet compressive strength tester detects bulk material components with different particle size distributions one by one or detects the bulk material components by sampling, and reasonable selection can be carried out according to actual working conditions). The material temperature detection unit detects the temperature of the bulk material after the intensity detection is finished (can detect one by one, and can also detect the bulk material in a sampling mode, for example, a temperature detector or an infrared thermometer and the like are adopted, and reasonable selection can be carried out according to actual working conditions). The material moisture content detecting unit detects the moisture content of bulk materials (can detect one by one, also can detect by sampling, for example, adopt moisture rapid determination appearance to carry out moisture detection to bulk materials, can carry out reasonable selection according to operating condition) of accomplishing temperature detection. It should be noted that, the detection sequence can be reasonably adjusted and exchanged according to the actual working condition. Generally, when the four indexes are detected and qualified, the bulk pellets are pellets which meet the requirements of the rotary kiln for oxidizing roasting. Can be directly conveyed into the rotary kiln. The waste of the part of qualified bulk materials is avoided, and the part of qualified bulk materials are returned to the kiln for roasting, so that the yield of the pellets can be greatly improved.

It should be noted that, in the present invention, each detection unit may be provided with a plurality of units, for example: the number of the material particle size detection unit, the material hardness detection unit, the material temperature detection unit and the material moisture content detection unit is 1-10, preferably 2-8, and more preferably 3-5.

In the present invention, if the bulk material satisfies the rotary kiln oxidizing roasting condition, the larger the particle size of the bulk material is, the higher the strength is, the higher the temperature is, and the lower the water content is, the better is. Therefore, in this scheme, the standard parameter values can be set: the minimum particle size of the qualified bulk material is Dmin and mm (generally more than or equal to 5mm, preferably more than or equal to 5.5 mm). The minimum strength of the qualified bulk material is Nmin, N (generally greater than or equal to 480N, preferably greater than or equal to 500N). The minimum temperature of the acceptable bulk material is Tmin at (generally ≥ 400 ℃, preferably ≥ 450 ℃). The maximum water content of the qualified bulk material is Wmax, and the mass percentage is generally less than or equal to 4 percent, and preferably less than or equal to 2 percent. In a unit time period, the actual measurement particle size of the bulk material detected by a material particle size detection unit in the material transition bin to be detected is Dc and mm; the actual measurement strength of the bulk material detected by the material hardness detection unit is Nc, N; the actual measurement temperature of the bulk material detected by the material temperature detection unit is Tc and DEG C; the actually measured moisture content of the bulk material detected by the material moisture content detection unit is Wc,%; setting the comprehensive performance index of the bulk material as Y, then:

in formula I, I is a weight index of the particle size of the bulk material. j is a weight index of the hardness of the bulk material. k is the weight index of bulk temperature. r is the weight index of the water content of the bulk material. Through formula I, the particle size, strength, temperature, moisture content and other parameters of the bulk material can be effectively coupled, so that a more visual parameter value (bulk material comprehensive performance index) is obtained, and whether the bulk material is qualified bulk material or not (the bulk material meeting the rotary kiln oxidizing and roasting condition is defined as qualified bulk material) is accurately and quickly judged by judging the value and the standard value. Wherein, the value of i is 0.2-0.4. j is 0.3-0.5. k is 0.15-0.25. r ranges from 0.01 to 0.05 and i + j + k + r is 1. Greatly improves the production efficiency and reduces the production cost.

In the present invention, the unit time period refers to a certain period of time or cycle in the pellet production process. The time period may be divided according to time (e.g., days, hours, minutes, etc.), or may be determined according to the time taken for drying and preheating green pellets of the same quality (e.g., green pellets of the same batch in the same equipment) in a certain period. The establishment of the unit time period can be reasonably set according to the actual working condition.

In the invention, the bulk material centralized collection and treatment device comprises a drying section bulk material collection and treatment device and a preheating section bulk material collection and treatment device. Namely, bulk materials generated by the chain grate machine are collected in sections. Aiming at low-temperature bulk materials (generally bulk materials in a drying section of a chain grate machine), a belt conveyor is generally adopted for conveying, then the low-temperature bulk materials are lifted to a crusher for treatment by a low-temperature bucket lifter, and then dry grinding, storage in a buffer bin and the like are sequentially carried out by adopting a chute conveying mode. And to high temperature bulk cargo (generally be chain grate machine preheating section bulk cargo), adopt high temperature resistant chain slat conveyor (high temperature bulk cargo can reduce the life of belt conveyor conveyer belt with higher speed), then carry the coarse grain material that satisfies the calcination requirement to carry out the calcination processing in adopting high temperature resistant bucket to carry the machine to carry to the rotary kiln after the screening.

Further, under the general condition, because the bulk cargo intensity of drying section, the water content, temperature etc. hardly reach the condition of directly carrying to the rotary kiln and carrying out the oxidation calcination, consequently can directly handle the bulk cargo of drying section as the balling raw materials according to actual conditions (promptly in examining the material transition bin, the drying section bulk cargo is not directly mixed with preheating section bulk cargo, but directly carry to the breaker, and to some operating modes, the drying section bulk cargo can satisfy the condition that the rotary kiln calcination required, then detect the screening again after drying section bulk cargo and preheating section bulk cargo are directly mixed, can rationally confirm according to operating condition), on the one hand can improve production efficiency, on the other hand has also avoided the drying section to cause unqualified error that detects the screening to the qualified bulk cargo of preheating section.

Compared with the prior art, the invention has the following beneficial technical effects:

1: the method for comprehensively treating bulk materials of the pellet chain grate machine does not adopt the mode that bulk materials are transported to a stock yard by an automobile, so that the transportation cost is reduced, the stock yard storage cost is reduced, the material loss cost is reduced, the miscellaneous and depreciation cost is reduced, and the internal recycling of materials in a pellet plant is realized. Meanwhile, the bulk cargo does not occupy the stock ground, so that the investment cost is reduced, and the operation efficiency of the stock ground is improved.

2: according to the method for comprehensively treating the bulk materials of the pellet chain grate machine, the comprehensive performance of the bulk materials is actually detected by arranging the material transition bin to be detected, and the fast and accurate screening of the bulk materials is realized through the coupling mathematical model, so that the qualified bulk materials are recycled to the maximum value. The production cost is reduced, and the production efficiency is greatly improved.

3: the method for comprehensively treating the bulk materials of the pellet chain grate machine changes bulk material treatment into in-system recycling, avoids the problem of dust emission in the transferring and loading processes, and improves the environment.

4: the system for comprehensively treating the bulk materials of the pellet chain grate machine cancels the existing bulk material ore tank, and reduces the construction cost.

5: the bulk material comprehensive treatment system of the pellet chain grate machine can carry out sectional treatment on the bulk material generated by the chain grate machine, so that the high-temperature bulk material does not damage the conveying belt of the belt conveyor any more, and the service life of the conveying belt of the belt conveyor is prolonged.

6: the system for comprehensively treating the bulk materials of the pellet chain grate machine can be used for intensively treating the bulk materials of the chain grate machine only by one set of equipment, thereby greatly reducing the investment cost and ensuring the continuity of system production.

Drawings

FIG. 1 is a flow chart of the method for comprehensive treatment of bulk materials by the pellet chain grate machine.

Fig. 2 is a prior art structural view.

Fig. 3 is a schematic view of a system for uniformly collecting bulk materials for comprehensive bulk material treatment of the pellet chain grate machine.

Fig. 4 is a schematic structural diagram of sectional collection of bulk materials of the system for comprehensive bulk material treatment of the pellet chain grate machine.

Fig. 5 is a structural diagram of the system for collecting and processing the bulk materials of the integrated pellet chain grate machine.

Fig. 6 is a structural diagram of the system bulk material sectional collection and centralized processing of the bulk material comprehensive processing of the pellet chain grate machine.

Reference numerals: 1: a chain grate machine; 101: a hot air bellows; 102: a small grid hopper; UDD: a forced air drying section; DDD: an air draft drying section; TPH: preheating for one section; pH: a second preheating stage; 2: a rotary kiln; 3: bulk material centralized collection and treatment device; 301: a first conveyor; 302: screening machine; 303: a second conveyor; 304: a third conveyor; 4: a bulk material collecting and processing device at the drying section; 401: a first drying section conveyor; 402: a drying section screening machine; 403: a second drying section conveyor; 404: a third drying section conveyor; 5: a bulk material collecting and processing device at the preheating section; 501: a first preheating section conveyor; 502: a preheating section screening machine; 503: a second preheating section conveyor; 504: a third preheating section conveyor; 6: a material transition bin to be detected; 601: a material particle size detection unit; 602: a material hardness detection unit; 603: a material temperature detection unit; 604: a material moisture content detection unit; 605: a qualified material conveying pipeline; 606: a non-qualified material conveying pipeline; 7: a crusher; 8: a bucket elevator; 9: a dry mill; 10: a wet mill; 1001: a water circulation pipeline; 11: a buffer bin; 1101: a powder conveying pipeline; 12: pelletizing; 13: a green ball conveying device; 14: a wetting machine; 1401: a spray head; 1402: a water inlet pipe; s1: a first chute; s2: a second chute; s3: a third chute; s4: a fourth chute; s5: a fifth chute; s6: and a sixth chute.

Detailed Description

The technical solution of the present invention is illustrated below, and the claimed scope of the present invention includes, but is not limited to, the following examples.

According to a first embodiment of the invention, a method for the integrated treatment of bulk material by a pellet grate machine is provided: the method comprises the following steps:

1) according to the trend of materials, green pellets enter a chain grate machine 1, sequentially pass through an air blowing drying section UDD, an air exhausting drying section DDD, a transition preheating section TPH and a preheating section PH on the chain grate machine 1, and are conveyed into a rotary kiln 2 for oxidizing roasting.

2) Collecting the bulk materials generated in the process of passing the materials in the step 1) through the chain grate machine 1, and detecting the parameter information of the particle size, the hardness, the moisture content and the temperature of the bulk materials.

3) And establishing a bulk material sorting mathematical model according to the detected parameter information.

4) And calculating to obtain the comprehensive performance index value of the bulk materials through a bulk material sorting mathematical model, and determining the subsequent treatment mode of the part of the bulk materials according to the calculated value of the comprehensive performance index of the bulk materials.

Preferably, the bulk material sorting mathematical model is as follows:

in the formula I, Y is the comprehensive performance index of the bulk material. Dc is the detected particle size of the bulk material, mm. Nc is the detected hardness of the bulk material, N. Tc is the detected bulk temperature, DEG C. And Wc is the detected water content of the bulk material in percentage by mass. Dmin is the set minimum particle size, mm, of the qualified bulk material. Nmin is the set minimum strength, N, of a qualified bulk material. Tmin is the set minimum temperature of qualified bulk cargo, DEG C. Wmax is the maximum water content and mass percentage of the set qualified bulk material. i is a weight index of the particle size of the bulk material. j is a weight index of the hardness of the bulk material. k is the weight index of bulk temperature. r is the weight index of the water content of the bulk material.

Preferably, i is 0.2 to 0.4; j is 0.3 to 0.5; k is 0.15 to 0.25; r is 0.01-0.05, and i + j + k + r is 1.

Preferably, the step 4) is specifically:

401) when Y is more than or equal to 1. The bulk material is conveyed to a rotary kiln 2 to be subjected to oxidizing roasting treatment.

402) When Y is less than 1, the bulk material is used as pelletizing material for pelletizing treatment.

Preferably, in step 2), the bulk material is collected specifically as follows: and in a unit time period, intensively collecting and screening bulk materials of the air blowing drying section UDD and the air draft drying section DDD of the chain grate machine, and meanwhile intensively collecting and screening bulk materials of the transition preheating section TPH and the preheating section PH. And all oversize materials are used as bulk materials to be detected. All the undersize materials are used as pelletizing raw materials to carry out pelletizing treatment.

Or, in a unit time period, collecting and screening all bulk materials of the grate blower drying section UDD air draft drying section DDD, the transition preheating section TPH and the preheating section PH in a centralized manner. And all oversize materials are used as bulk materials to be detected. All the undersize materials are used as pelletizing raw materials to carry out pelletizing treatment.

Preferably, the particle size of the oversize material is more than or equal to 5mm, preferably more than or equal to 5.5 mm.

Preferably, the pelletizing treatment specifically comprises: the bulk material as the pelletizing raw material is firstly refined, then is mixed with other pelletizing raw materials, and finally is pelletized.

Preferably, the refining treatment specifically comprises: the bulk material as the pelletizing raw material is first crushed (for example, to a particle size of 3mm or less, preferably 2mm or less). Then, dry-grinding treatment is carried out (for example, dry-grinding is carried out until the particle size is less than or equal to 0.074mm and is 70 to 90%, preferably, the particle size is less than or equal to 0.074mm and is 75 to 85%). Then a moistening treatment (e.g. spray water treatment to a water content of 7-9%, preferably 8-8.5%) is carried out. And finally, the pellets are conveyed to a pelletizer 11 for pelletizing.

Or, the refining processing specifically includes: the bulk material as the pelletizing raw material is first crushed (for example, to a particle size of 3mm or less, preferably 2mm or less). Then, wet milling treatment is carried out (for example, wet milling is carried out until the particle size is 0.074mm or less in the range of 70 to 90%, preferably 0.074mm or less in the range of 75 to 85%). The pulp is then filtered and the filtrate is returned to continue to participate in the wet milling. The filter cake is conveyed to a pelletizer 11 for pelletizing.

According to a second embodiment of the invention, there is provided a system for integrated treatment of a pellet chain grate bulk material or a system for use in the method for integrated treatment of a pellet chain grate bulk material according to the first embodiment: the system comprises a chain grate 1, a rotary kiln 2 and a bulk material centralized collection and treatment device 3. The discharge hole of the chain grate 1 is communicated with the feed inlet of the rotary kiln 2. The chain grate machine 1 comprises a drying section and a preheating section. The bulk material centralized collection and treatment device 3 is arranged below the drying section and the preheating section of the chain grate 1. The discharge end of the bulk material centralized collection and treatment device 3 is connected with a material transition bin 6 to be detected. The material transition bin 6 to be detected is internally provided with a material particle size detection unit 601, a material hardness detection unit 602, a material temperature detection unit 603 and a material moisture content detection unit 604.

Preferably, the drying section of the chain grate 1 comprises an air-blowing drying section UDD and an air-draft drying section DDD. The preheating section of the chain grate machine 1 comprises a preheating section TPH and a preheating section PH. And the forced air drying section UDD, the air draft drying section DDD, the preheating section TPH and the preheating section PH are sequentially connected in series. And hot air bellows 101 are arranged on two sides of each of the blowing drying section UDD, the exhausting drying section DDD, the preheating section TPH and the preheating section PH. And a small grid hopper 102 is arranged below each of the forced air drying section UDD, the air draft drying section DDD, the preheating section TPH and the preheating section PH. The bulk material centralized collection and treatment device 3 is positioned below the small grid hoppers 102 of the air blowing drying section UDD, the air draft drying section DDD, the preheating section TPH and the preheating section PH.

Preferably, the bulk material centralized collection and processing device 3 comprises a first conveyor 301, a screening machine 302, a second conveyor 303 and a third conveyor 304. The first conveyor 301 is arranged below the small grid hoppers 102 of the air blowing drying section UDD, the air draft drying section DDD, the preheating first-stage TPH and the preheating second-stage PH. The sizer 302 is positioned at the discharge end of the first conveyor 301. The material discharge gate on the sieve of screening machine 302 is connected with the feed inlet of waiting to examine material transition bin 6 through second conveyer 303. The undersize material outlet of the sieving machine 302 is connected with the feed inlet of the crusher 7 through a third conveyor 304.

Alternatively, the bulk material centralized collection and processing device 3 comprises a drying section bulk material collection and processing device 4 and a preheating section bulk material collection and processing device 5. The drying section bulk material collecting and processing device 4 is positioned below the small grid hoppers 102 of the air blowing drying section UDD and the air draft drying section DDD. The preheating section bulk material collecting and processing device 5 is positioned below the small grid hoppers 102 of the preheating section TPH and the preheating section PH.

Preferably, the bulk drying section collecting and processing device 4 comprises a first drying section conveyor 401, a drying section screening machine 402, a second drying section conveyor 403 and a third drying section conveyor 404. The first drying section conveyor 401 is arranged below the small grid hoppers 102 of the forced air drying section UDD and the induced draft drying section DDD. The dryer section screening machine 402 is arranged at the discharge end of the first dryer section conveyor 401. The material discharge port on the sieve of the drying section sieving machine 402 is connected with the feed port of the material transition bin 6 to be detected through a second drying section conveyer 403. The undersize material outlet of the drying section sieving machine 402 is connected with the feed inlet of the crusher 7 through a third conveyor 404.

Preferably, the preheating-section bulk collecting and processing device 5 includes a first preheating-section conveyor 501, a preheating-section screening machine 502, a second preheating-section conveyor 503, and a third preheating-section conveyor 504. The first preheating stage conveyor 501 is disposed below the cell hoppers 102 of the preheating stage TPH and the preheating stage PH. The preheating section screening machine 502 is arranged at the discharge end of the first preheating section conveyor 501. The material discharge port on the screen of the preheating section screening machine 502 is connected with the material inlet of the material transition bin 6 to be detected through a second preheating section conveyor 503. The screen underflow material outlet of the preheating section screening machine 502 is connected with the inlet of the crusher 7 through a third conveyor 504.

Preferably, the system further comprises a bucket elevator 8. The feed end of the bucket elevator 8 is connected with the qualified material discharge port of the material transition bin 6 to be detected through a qualified material conveying pipeline 605. The discharge end of the bucket elevator 8 is connected with the feed inlet of the rotary kiln 2 through a first chute S1. The non-qualified material discharge port of the material transition bin 6 to be detected is connected with the feed inlet of the crusher 7 through a non-qualified material conveying pipeline 606.

Preferably, the screen holes of the screening machine 302, the drying section screening machine 402 and the preheating section screening machine 502 are all larger than or equal to 5mm, preferably larger than or equal to 5.5 mm.

Preferably, the system further comprises a dry mill 9 and/or a wet mill 10 and a surge bin 11. The inlet opening of the dry mill 9 is connected to the outlet opening of the crusher 7 via a second chute S2. The discharge opening of the dry mill 9 is connected with the feed opening of the surge bin 11 through a third chute S3.

Preferably, the inlet opening of the wet mill 10 is connected to the outlet opening of the crusher 7 via a fourth chute S4. The discharge opening of the wet mill 10 is connected with the feed opening of the surge bin 11 via a fifth chute S5.

Preferably, the residue discharge port of the wet mill 10 is connected with the feed port of the surge bin 11 through a fifth chute S5. The filtrate outlet of the wet grinder 10 is connected with the water inlet of the wet grinder 10 through a circulating water pipe 1001.

Preferably, the system further comprises a pelletizer 12. The feed inlet of the pelletizer 12 is connected with the discharge outlet of the buffer bin 11 through a powder conveying pipeline 1101. The discharge outlet of the pelletizer 12 is connected with the feed inlet of the chain grate machine 1 through a green pellet conveying device 13.

Preferably, the system further includes a moistener 14. The moistening machine 14 is arranged on the powder conveying pipeline 1101 between the buffer bin 11 and the pelletizer 12. A spray head 1401 is arranged in the inner cavity of the moistening machine 14. The water inlet end of the spray head 1401 is communicated with a water inlet pipe 1402.

Preferably, the system further comprises a sixth chute S6. The feed inlet of the sixth chute S6 is connected below the discharge end of the chain grate 1. The discharge hole of the sixth chute S6 is communicated to the feed hole of the sieving machine 302 or the preheating section sieving machine 502.

Preferably, the first conveyor 301, the second conveyor 303, the third conveyor 304, the first preheating section conveyor 501, the second preheating section conveyor 503, and the third preheating section conveyor 504 are all chain conveyors. The first drying section conveyor 401, the second drying section conveyor 403 and the third drying section conveyor 404 are all belt conveyors.

Preferably, the dry mill 9 is one of a dry disc mill, a dry ball mill, and a dry roll mill.

Example 1

As shown in fig. 3 and 4, a system for integrated processing of a pellet grate bulk material or a system for a method for integrated processing of a pellet grate bulk material according to the first embodiment: the system comprises a chain grate 1, a rotary kiln 2 and a bulk material centralized collection and treatment device 3. The discharge hole of the chain grate 1 is communicated with the feed inlet of the rotary kiln 2. The chain grate machine 1 comprises a drying section and a preheating section. The bulk material centralized collection and treatment device 3 is arranged below the drying section and the preheating section of the chain grate 1. The discharge end of the bulk material centralized collection and treatment device 3 is connected with a material transition bin 6 to be detected. The material transition bin 6 to be detected is internally provided with a material particle size detection unit 601, a material hardness detection unit 602, a material temperature detection unit 603 and a material moisture content detection unit 604.

Example 2

Example 1 was repeated except that the drying section of the chain grate 1 included an air-blowing drying section UDD and an air-draft drying section DDD. The preheating section of the chain grate machine 1 comprises a preheating section TPH and a preheating section PH. And the forced air drying section UDD, the air draft drying section DDD, the preheating section TPH and the preheating section PH are sequentially connected in series. And hot air bellows 101 are arranged on two sides of each of the blowing drying section UDD, the exhausting drying section DDD, the preheating section TPH and the preheating section PH. And a small grid hopper 102 is arranged below each of the forced air drying section UDD, the air draft drying section DDD, the preheating section TPH and the preheating section PH. The bulk material centralized collection and treatment device 3 is positioned below the small grid hoppers 102 of the air blowing drying section UDD, the air draft drying section DDD, the preheating section TPH and the preheating section PH.

Example 3

Example 2 is repeated, as shown in fig. 5, except that the bulk material collective collection and treatment apparatus 3 includes a first conveyor 301, a sifter 302, a second conveyor 303, and a third conveyor 304. The first conveyor 301 is arranged below the small grid hoppers 102 of the air blowing drying section UDD, the air draft drying section DDD, the preheating first-stage TPH and the preheating second-stage PH. The sizer 302 is positioned at the discharge end of the first conveyor 301. The material discharge gate on the sieve of screening machine 302 is connected with the feed inlet of waiting to examine material transition bin 6 through second conveyer 303. The undersize material outlet of the sieving machine 302 is connected with the feed inlet of the crusher 7 through a third conveyor 304.

Example 4

Example 2 was repeated, as shown in fig. 6, except that the bulk material collective-collection processing apparatus 3 includes a drying-stage bulk material collection processing apparatus 4 and a preheating-stage bulk material collection processing apparatus 5. The drying section bulk material collecting and processing device 4 is positioned below the small grid hoppers 102 of the air blowing drying section UDD and the air draft drying section DDD. The preheating section bulk material collecting and processing device 5 is positioned below the small grid hoppers 102 of the preheating section TPH and the preheating section PH.

Example 5

Example 4 is repeated, and the bulk material collecting and processing device 4 of the drying section comprises a first drying section conveyor 401, a drying section screening machine 402, a second drying section conveyor 403 and a third drying section conveyor 404. The first drying section conveyor 401 is arranged below the small grid hoppers 102 of the forced air drying section UDD and the induced draft drying section DDD. The dryer section screening machine 402 is arranged at the discharge end of the first dryer section conveyor 401. The material discharge port on the sieve of the drying section sieving machine 402 is connected with the feed port of the material transition bin 6 to be detected through a second drying section conveyer 403. The undersize material outlet of the drying section sieving machine 402 is connected with the feed inlet of the crusher 7 through a third conveyor 404.

Example 6

In the embodiment 5, the preheating-section bulk material collecting and processing device 5 includes a first preheating-section conveyor 501, a preheating-section screening machine 502, a second preheating-section conveyor 503, and a third preheating-section conveyor 504. The first preheating stage conveyor 501 is disposed below the cell hoppers 102 of the preheating stage TPH and the preheating stage PH. The preheating section screening machine 502 is arranged at the discharge end of the first preheating section conveyor 501. The material discharge port on the screen of the preheating section screening machine 502 is connected with the material inlet of the material transition bin 6 to be detected through a second preheating section conveyor 503. The screen underflow material outlet of the preheating section screening machine 502 is connected with the inlet of the crusher 7 through a third conveyor 504.

Example 7

Example 6 is repeated as shown in fig. 5-6, except that the system further comprises a bucket elevator 8. The feed end of the bucket elevator 8 is connected with the qualified material discharge port of the material transition bin 6 to be detected through a qualified material conveying pipeline 605. The discharge end of the bucket elevator 8 is connected with the feed inlet of the rotary kiln 2 through a first chute S1. The non-qualified material discharge port of the material transition bin 6 to be detected is connected with the feed inlet of the crusher 7 through a non-qualified material conveying pipeline 606.

Example 8

Example 7 is repeated, except that the screen holes of the screening machine 302, the drying section screening machine 402 and the preheating section screening machine 502 are all larger than or equal to 5 mm.

Example 9

Example 8 is repeated except that the system further comprises a dry mill 9 and a wet mill 10 and a surge bin 11. The inlet opening of the dry mill 9 is connected to the outlet opening of the crusher 7 via a second chute S2. The discharge opening of the dry mill 9 is connected with the feed opening of the surge bin 11 through a third chute S3.

Example 10

Example 9 was repeated except that the feed inlet of the wet mill 10 was connected to the discharge outlet of the crusher 7 via a fourth chute S4. The discharge opening of the wet mill 10 is connected with the feed opening of the surge bin 11 via a fifth chute S5.

Example 11

Example 10 is repeated, except that the residue outlet of the wet grinding mill 10 is connected to the inlet of the surge bin 11 via a fifth chute S5. The filtrate outlet of the wet grinder 10 is connected with the water inlet of the wet grinder 10 through a circulating water pipe 1001.

Example 12

Example 11 is repeated except that the system also includes a pelletizer 12. The feed inlet of the pelletizer 12 is connected with the discharge outlet of the buffer bin 11 through a powder conveying pipeline 1101. The discharge outlet of the pelletizer 12 is connected with the feed inlet of the chain grate machine 1 through a green pellet conveying device 13.

Example 13

Example 12 is repeated except that the system further includes a moistener 14. The moistening machine 14 is arranged on the powder conveying pipeline 1101 between the buffer bin 11 and the pelletizer 12. A spray head 1401 is arranged in the inner cavity of the moistening machine 14. The water inlet end of the spray head 1401 is communicated with a water inlet pipe 1402.

Example 14

Example 13 is repeated except that the system further includes a sixth chute S6. The feed inlet of the sixth chute S6 is connected below the discharge end of the chain grate 1. The discharge hole of the sixth chute S6 is communicated to the feed hole of the sieving machine 302 or the preheating section sieving machine 502.

Example 15

Example 14 was repeated except that the first conveyor 301, the second conveyor 303, the third conveyor 304, the first preheating section conveyor 501, the second preheating section conveyor 503 and the third preheating section conveyor 504 were all chain conveyors. The first drying section conveyor 401, the second drying section conveyor 403 and the third drying section conveyor 404 are all belt conveyors.

Example 16

Example 15 was repeated except that the dry mill 9 was a dry disc mill.

Method example 1

In a unit time period (a period that 15 tons of green pellets of the first batch of the No. 1 pelletizer are produced into cooked pellets through a chain grate machine-rotary kiln), the minimum particle size of qualified bulk pellets is set to be Dmin which is 5 mm. The minimum strength of a qualified bulk material is 480N. The minimum temperature of the qualified bulk material is Tmin 450 ℃. The maximum water content of the qualified bulk material is 2 percent (mass percentage). The weight index i of the particle size of the bulk material was 0.28. The weighting index j of the bulk hardness is 0.45. The weighting index k of the bulk material temperature is 0.24. The weight index r of the water content of the bulk material is 0.03.

Meanwhile, 315kg of the material to be detected is collected in the material transition bin 6 to be detected; it was further detected that the average particle size of the bulk pellets in this portion was 8.4 mm. The average strength of the bulk pellets was 613N. The average temperature of the bulk pellets was 477.1 ℃. The average moisture content of the bulk pellets was 0.8%.

Then:

because Y is approximately equal to 1.344 and is larger than 1, the part of bulk materials are put into a rotary kiln for oxidation roasting treatment.

Method example 2

In a unit time period (a period that 15 tons of green pellets of the second batch of the No. 1 pelletizer are produced into cooked pellets through a chain grate machine-rotary kiln), the minimum particle size of qualified bulk pellets is set to be Dmin which is 5 mm. The minimum strength of a qualified bulk material is 480N. The minimum temperature of the qualified bulk material is Tmin 450 ℃. The maximum water content of the qualified bulk material is 2 percent (mass percentage). The weight index i of the particle size of the bulk material was 0.28. The weighting index j of the bulk hardness is 0.45. The weighting index k of the bulk material temperature is 0.24. The weight index r of the water content of the bulk material is 0.03.

At the same time, 719kg of materials to be detected are collected in the material transition bin 6 to be detected; it was further detected that the average particle size of the bulk pellets in this portion was 6.5 mm. The average strength of the bulk pellets was 744N. The average temperature of the bulk pellets was 502 ℃. The average moisture content of the bulk pellets was 0.5%.

Then:

because Y is approximately equal to 1.403 and is more than 1, part of the bulk material is put into a rotary kiln for oxidation roasting treatment.

Method example 3

In a unit time period (a period that 20 tons of green pellets of the first batch of the No. 2 pelletizer are produced into cooked pellets through a chain grate machine-rotary kiln), the minimum particle size of qualified bulk pellets is set to be Dmin which is 5 mm. The minimum strength of a qualified bulk material is 480N. The minimum temperature of the qualified bulk material is Tmin 450 ℃. The maximum water content of the qualified bulk material is 2 percent (mass percentage). The weight index i of the particle size of the bulk material was 0.28. The weighting index j of the bulk hardness is 0.45. The weighting index k of the bulk material temperature is 0.24. The weight index r of the water content of the bulk material is 0.03.

Meanwhile, 553kg of materials to be detected are collected in the material transition bin 6 to be detected; it was further detected that the average particle size of the bulk pellets in this portion was 4 mm. The bulk pellets had an average strength of 453N. The average temperature of the bulk pellets was 510 ℃. The average moisture content of the bulk pellets was 0.7%.

Then:

because Y is approximately equal to 0.962 < 1, the pellet manufacturing treatment is carried out by using the bulk material as the pellet manufacturing raw material.

Method example 4

In a unit time period (a period that 20 tons of green pellets of the second batch of the No. 2 pelletizer are produced into cooked pellets through a chain grate machine-rotary kiln), the minimum particle size of qualified bulk pellets is set to be Dmin which is 5 mm. The minimum strength of a qualified bulk material is 480N. The minimum temperature of the qualified bulk material is Tmin 450 ℃. The maximum water content of the qualified bulk material is 2 percent (mass percentage). The weight index i of the particle size of the bulk material was 0.28. The weighting index j of the bulk hardness is 0.45. The weighting index k of the bulk material temperature is 0.24. The weight index r of the water content of the bulk material is 0.03.

Meanwhile, 603kg of materials to be detected is collected in the material transition bin 6 to be detected; it was further detected that the average particle size of the bulk pellets in this portion was 4.5 mm. The average strength of the bulk pellets was 501N. The average temperature of the bulk pellets was 505 ℃. The average moisture content of the bulk pellets was 0.9%.

Then:

because Y is approximately equal to 1.043 and is more than 1, the part of bulk materials are put into a rotary kiln for oxidation roasting treatment.

Method example 5

In a unit time period (a period that 20 tons of green pellets of the third batch of the No. 2 pelletizer are produced into cooked pellets through a chain grate machine-rotary kiln), the minimum particle size of qualified bulk pellets is set to be Dmin which is 5 mm. The minimum strength of a qualified bulk material is 480N. The minimum temperature of the qualified bulk material is Tmin 450 ℃. The maximum water content of the qualified bulk material is 2 percent (mass percentage). The weight index i of the particle size of the bulk material was 0.28. The weighting index j of the bulk hardness is 0.45. The weighting index k of the bulk material temperature is 0.24. The weight index r of the water content of the bulk material is 0.03.

Meanwhile, 408kg of materials to be detected are collected in the material transition bin 6 to be detected; it was further detected that the average particle size of the bulk pellets in this portion was 5.1 mm. The average strength of the bulk pellets was 487N. The average temperature of the bulk pellets was 463 ℃. The average moisture content of the bulk pellets was 1.5%.

Then:

because Y is approximately equal to 1.029 > 1, the part of bulk materials are put into a rotary kiln for oxidation roasting treatment.

Method example 6

In a unit time period (a period that 20 tons of green pellets of the first batch of the No. 3 pelletizer are produced into cooked pellets through a chain grate machine-rotary kiln), the minimum particle size of qualified bulk pellets is set to be Dmin which is 5 mm. The minimum strength of a qualified bulk material is 480N. The minimum temperature of the qualified bulk material is Tmin 450 ℃. The maximum water content of the qualified bulk material is 2 percent (mass percentage). The weight index i of the particle size of the bulk material was 0.28. The weighting index j of the bulk hardness is 0.45. The weighting index k of the bulk material temperature is 0.24. The weight index r of the water content of the bulk material is 0.03.

Meanwhile, 482kg of materials to be detected are collected in the material transition bin 6 to be detected; it was further detected that the average particle size of the bulk pellets in this portion was 4.7 mm. The average strength of the bulk pellets was 470N. The average temperature of the bulk pellets was 438 ℃. The average moisture content of the bulk pellets was 2.1%.

Then:

because Y is approximately equal to 0.969 and less than 1, part of the bulk material is put into a rotary kiln for oxidation roasting treatment.

Method example 7

In a unit time period (a period that 20 tons of green pellets of the first batch of the No. 3 pelletizer are produced into cooked pellets through a chain grate machine-rotary kiln), the minimum particle size of qualified bulk pellets is set to be Dmin which is 5 mm. The minimum strength of a qualified bulk material is 480N. The minimum temperature of the qualified bulk material is Tmin 450 ℃. The maximum water content of the qualified bulk material is 2 percent (mass percentage). The weight index i of the particle size of the bulk material was 0.29. The weighting index j of the bulk hardness is 0.44. The weighting index k of the bulk material temperature is 0.22. The weight index r of the moisture content of the bulk material is 0.05.

Meanwhile, 487kg of the material to be detected is collected in the material transition bin 6 to be detected; it was further detected that the average particle size of the bulk pellets in this portion was 4.7 mm. The average strength of the bulk pellets was 470N. The average temperature of the bulk pellets was 438 ℃. The average moisture content of the bulk pellets was 2.1%.

Then:

because Y is approximately equal to 0.965 < 1, part of the bulk material is put into a rotary kiln for oxidation roasting treatment.

Method example 8

In a unit time period (a period that 20 tons of green pellets of the first batch of the No. 2 pelletizer are produced into cooked pellets through a chain grate machine-rotary kiln), the minimum particle size of qualified bulk pellets is set to be Dmin which is 5 mm. The minimum strength of a qualified bulk material is 480N. The minimum temperature of the qualified bulk material is Tmin 450 ℃. The maximum water content of the qualified bulk material is 2 percent (mass percentage). The weight index i of the particle size of the bulk material was 0.29. The weighting index j of the bulk hardness is 0.44. The weighting index k of the bulk material temperature is 0.22. The weight index r of the moisture content of the bulk material is 0.05.

Meanwhile, 553kg of materials to be detected are collected in the material transition bin 6 to be detected; it was further detected that the average particle size of the bulk pellets in this portion was 4 mm. The bulk pellets had an average strength of 453N. The average temperature of the bulk pellets was 510 ℃. The average moisture content of the bulk pellets was 0.7%.

Then:

because Y is approximately equal to 0.990 < 1, the part of the bulk material is used as a pelletizing raw material to be pelletized.