阅读说明：本技术 一种烧结混合制粒工艺及系统 (Sintering mixing granulation process and system ) 是由 张卫华 兰军 张全申 张海蓉 赵成显 智谦 于 2021-09-26 设计创作，主要内容包括：本发明涉及一种烧结混合制粒工艺,属于烧结技术领域。该工艺包括以下步骤：定量的获取用于烧结制粒的返矿、铁原料、熔剂、燃料以及钢厂废料；将获取所述铁原料、熔剂、燃料以及钢厂废料输送至混合机中,并向所述混合机中通入适量的水搅拌、混匀,获得预混合原料；将所述返矿和获得的所述预混合原料输送至制粒机中,并向制粒机中加入适量的水和蒸汽混合制粒,获得用于烧结的粒料；将获得的所述粒料输送至所述烧结机中烧结,获得烧结料。本发明将返矿直接加入制粒机中,从而减少了混合机中的原料体积和重量,提高了混合机的混合效果和混合机的选型范围,同时避免了返矿进入混合机中对混合机的损坏,提高了混合机衬板的使用寿命。(The invention relates to a sintering mixing granulation process, and belongs to the technical field of sintering. The process comprises the following steps: quantitatively obtaining return ores, iron raw materials, a fusing agent, fuels and steel mill waste materials for sintering and granulating; conveying the obtained iron raw material, the flux, the fuel and the steel mill waste into a mixer, and introducing a proper amount of water into the mixer to stir and uniformly mix to obtain a premixed raw material; conveying the return ores and the obtained premixed raw materials to a granulator, adding a proper amount of water and steam into the granulator, and mixing and granulating to obtain granules for sintering; and conveying the obtained granules to the sintering machine for sintering to obtain a sintered material. According to the invention, the return ores are directly added into the granulator, so that the volume and the weight of raw materials in the mixer are reduced, the mixing effect of the mixer and the model selection range of the mixer are improved, the damage of the return ores entering the mixer to the mixer is avoided, and the service life of the lining plate of the mixer is prolonged.)

1. A sintering mixing granulation process is characterized by comprising the following steps:

quantitatively obtaining return ores, iron raw materials, a fusing agent, fuels and steel mill waste materials for sintering and granulating;

conveying the obtained iron raw material, the flux, the fuel and the steel mill waste into a mixer, and introducing a proper amount of water into the mixer to stir and uniformly mix to obtain a premixed raw material;

conveying the return ores and the obtained premixed raw materials to a granulator, adding a proper amount of water and steam into the granulator, and mixing and granulating to obtain granules for sintering;

and conveying the obtained granules to the sintering machine for sintering to obtain a sintered material.

2. A sinter mix granulation process according to claim 1, wherein water is added to wet the return ores before the obtained return ores are conveyed to the granulator.

3. The sintering, mixing and pelletizing process according to claim 1, wherein the return ores, iron raw materials, fluxes, fuels and steel mill waste are quantitatively obtained after being weighed in a proportioning room.

4. The sintering mixing granulation process according to claim 1, wherein the return ores are sintered return ores and/or blast furnace return ores.

5. The sinter mix granulation process of claim 1, wherein the iron material comprises one or more of magnetite, hematite, limonite, and siderite.

6. A sinter mix granulation process as claimed in claim 1, wherein the fluxing agent comprises one or more of limestone, dolomite, quicklime, slaked lime and serpentine.

7. The process of claim 1, wherein the fuel comprises anthracite and/or coke breeze.

8. The process of claim 1, wherein the mill waste comprises mill scale and/or fly ash.

9. A sinter mix granulation system, using the sinter mix granulation process of any one of claims 1 to 8, comprising:

the quantitative feeding device comprises a batching chamber, a plurality of quantitative feeding devices and a control device, wherein the batching chamber is internally provided with an iron raw material bin, a flux bin, a fuel bin, a steel mill waste bin, a mineral return bin and the quantitative feeding devices;

the iron raw material bin, the flux bin, the fuel bin and the steel mill waste material bin are connected with a feeding hole of the mixing machine after passing through the corresponding quantitative feeding devices;

the discharge port of the mixer is connected with the feed port of the granulator, and the return ore bin is connected with the feed port of the granulator after passing through the corresponding quantitative feeding device; and the number of the first and second groups,

and the feeding hole of the sintering machine is connected with the discharging hole of the granulator.

10. The sintering, mixing and granulating process of claim 9, wherein said mixer is any one of a vertical mixer, a horizontal mixer and a drum mixer, and said granulator is a drum granulator or a disk granulator.

Technical Field

The invention belongs to the technical field of sintering, and particularly relates to a sintering mixing granulation process and system.

Background

At present, the conventional sintering mixing granulation in China feeds all the sintered return ores and blast furnace return ores into a mixer for mixing, but the sintered return ores and the blast furnace return ores are added into the mixer to be mixed with other raw materials, so that the following defects exist:

because the hardness and the strength of the sintered return ores and the blast furnace return ores are high, the abrasion of the mixer, especially the abrasion of a lining plate in the mixer, can be increased in the mixing process of the mixer.

Because the ratio of the sintered return ores and the blast furnace return ores in the raw materials in the sintering, mixing and granulating process is high, adding the sintered return ores and the blast furnace return ores into the mixer not only needs to use a mixer with larger capacity, but also reduces the mixing effect of other raw materials except the sintered return ores and the blast furnace return ores, and needs longer mixing time to cause higher power consumption.

Disclosure of Invention

In view of the above, the present invention aims to overcome the defects of the prior art, and provide a sintering, mixing and granulating process to solve the technical problem of poor mixer effect in the sintering, mixing and granulating process in the prior art.

The invention is realized by the following technical scheme:

a sintering mixing granulation process comprises the following steps:

quantitatively obtaining return ores, iron raw materials, a fusing agent, fuels and steel mill waste materials for sintering and granulating;

conveying the obtained iron raw material, the flux, the fuel and the steel mill waste into a mixer, and introducing a proper amount of water into the mixer to stir and uniformly mix to obtain a premixed raw material;

conveying the return ores and the obtained premixed raw materials to a granulator, adding a proper amount of water and steam into the granulator, and mixing and granulating to obtain granules for sintering;

and conveying the obtained granules to the sintering machine for sintering to obtain a sintered material.

Optionally, in order to better implement the present invention, before the obtained return ores are delivered to the granulator, water is added to moisten the return ores.

Optionally, in order to better implement the method, the return ores, the iron raw materials, the flux, the fuel and the steel mill waste are weighed according to the proportion in a batching chamber and then quantitatively obtained.

Optionally, in order to better implement the invention, the return ores are sintered return ores and/or blast furnace return ores.

Alternatively, to better practice the invention, the iron material comprises one or more of magnetite, hematite, limonite and siderite.

Optionally, to better practice the invention, the flux comprises one or more of limestone, dolomite, quicklime, slaked lime and serpentine.

Alternatively, to better practice the invention, the fuel includes anthracite and/or coke breeze.

Alternatively, to better practice the invention, the steel mill waste comprises steel mill scale and/or fly ash.

A sintering mixing granulation system adopts the sintering mixing granulation process, and comprises the following steps:

the quantitative feeding device comprises a proportioning chamber, a feeding device and a control device, wherein the proportioning chamber is internally provided with an iron raw material bin, a flux bin, a fuel bin, a steel mill waste bin, a mineral return bin and a plurality of quantitative feeding devices, and the quantitative feeding devices are respectively arranged at a discharge hole of the iron raw material bin, a discharge hole of the flux bin, a discharge hole of the fuel bin, a discharge hole of the steel mill waste bin and a discharge hole of the mineral return bin;

the iron raw material bin, the flux bin, the fuel bin and the steel mill waste material bin are connected with a feeding hole of the mixing machine after passing through the corresponding quantitative feeding devices;

the discharge port of the mixer is connected with the feed port of the granulator, and the return ore bin is connected with the feed port of the granulator after passing through the corresponding quantitative feeding device; and the number of the first and second groups,

and the feeding hole of the sintering machine is connected with the discharging hole of the granulator.

Alternatively, in order to better implement the present invention, the mixer is any one of a vertical mixer, a horizontal mixer, and a drum mixer, and the granulator is a drum granulator or a disc granulator.

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

the invention adds the obtained iron raw material for sintering granulation, flux, fuel and steel mill waste into a mixer to be mixed to obtain a premixed raw material, and adds the return ores for sintering granulation and the obtained premixed raw material into a granulator to be granulated. Thereby reduced and dropped raw materials volume and the weight that drops into in the machine that mixes, improved the mixed effect of machine and the lectotype scope that mixes the machine, avoided the return mine to get into the damage to mixing the machine in mixing the machine simultaneously, improved the life who mixes the quick-witted welt.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow diagram of a sinter mix granulation process;

FIG. 2 is a schematic diagram of a sinter mix granulation process system.

In the figure:

100-a batching chamber; 110-iron feed stock bin; 120-a flux bin; 130-a fuel silo; 140-Steel works

A waste bin; 150-returning to the ore bin; 160-a dosing device;

200-a mixer; 300-a granulator; 400-sintering machine;

510-a first water duct; 520-a second water conveying pipe; 530-a steam pipeline; 540-water spraying device;

610-a first conveyor; 620-a second conveyor; 630-a third conveyor; 640-a fourth conveyor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

As shown in fig. 1, a sintering mixing granulation process comprises the following steps:

quantitatively obtaining return ores for sintering and granulating and other raw materials except the return ores, wherein the other raw materials comprise iron raw materials, flux, fuel and steel mill waste materials; wherein the iron material is an iron-containing material and comprises one or more of magnetite, hematite, limonite and siderite, and the flux comprises one or more of limestone, dolomite, quick lime, slaked lime and serpentine; the fuel can be anthracite, coke powder or mixed fuel formed by mixing anthracite and coke powder; the steel mill waste can be rolled steel sheet, dust removal ash and mixed waste formed by mixing the rolled steel sheet and the dust removal ash; the return ores can be sintered return ores, blast furnace return ores or mixed return ores formed by mixing the sintered return ores and the blast furnace return ores. The proportion and weight of iron raw materials, flux, fuel, steel mill waste and return fines are correspondingly different according to different formulas.

Quantitative acquisition of return ores and other raw materials is completed in a batching room, and the weight of required iron raw materials, the weight of flux, the weight of fuel, the weight of steel mill waste and the weight of return ores are respectively and quantitatively weighed through a quantitative feeding device in the batching room.

The weighed iron raw materials, the flux, the fuel and the steel mill waste materials are conveyed to a mixing machine to be stirred and uniformly mixed, a proper amount of water is added in the uniformly mixing process to be uniformly mixed with the raw materials, the iron raw materials, the flux, the fuel and the steel mill waste materials are mixed in a moistening mode in the stirring process, the mixing uniformity of the other raw materials is improved, dust is reduced, and the raw materials are prevented from being layered. The other wet mixed raw materials are obtained pre-mixed raw materials;

and after obtaining the pre-mixed raw materials, conveying the return ores and the obtained pre-mixed raw materials into a granulator, introducing a proper amount of water and steam into the granulator during granulation, and granulating by the granulator to obtain granules for sintering. In the granulating process, a proper amount of water and steam are introduced, so that the premixed raw materials and the return ores can be wetted, the premixed raw materials and the return ores can be preheated, the temperature of the granulated materials is increased, the fine-grained materials are conveniently adhered to the surface of the return ores in the granulating process, granules with the return ores as grain cores are formed, meanwhile, the over-wetting phenomenon can be prevented, and the purpose of strengthening sintering is achieved.

And finally, conveying the obtained pellets to a sintering machine for sintering.

In addition, water is added to wet the return ores before the obtained return ores are conveyed to the granulator. After the pre-wetted return ores are conveyed into the granulator, the pre-wetted return ores can be quickly combined with the pre-mixed raw materials, so that the pre-mixed raw materials are attached to the surface of the return ores, and the granulation speed and the granulation effect are further improved.

The process method only adds iron raw materials, flux, fuel and steel mill waste materials in the mixing procedure, reduces the capacity of the required mixer, thereby being suitable for mixers of more types or models, simultaneously reduces the total weight of materials mixed by the mixer each time, can increase the mixing effect of the mixer, and enables the obtained premixed materials to be more uniform. In addition, because the return ores with high hardness and high strength are not added into the mixer, the abrasion of the return ores to the mixer can be avoided, and the service life of the lining plate in the mixer is prolonged.

As shown in fig. 1, in addition, water is added to wet the return ores before feeding them to the granulator. Specifically, in the process of conveying return ores to the granulator, the return ores on the conveying belt are pre-moistened in a water spraying mode. Because the sintering return ores and the blast furnace return ores are both of porous structures and are granule cores in the granulation process, the surfaces of the return ores which are not wetted are not easy to adhere to the premixed raw materials in the granulation process, and meanwhile, part of the return ores are not fully wetted and are wrapped by the premixed raw materials, so that the sintering of a subsequent sintering machine is not facilitated, and therefore, the return ores are wetted in advance in the process of conveying the return ores to the granulator, and the forming speed of granules and the quality of the granules can be improved.

In the process, the mixer may be a vertical mixer, a horizontal mixer, or a cylindrical mixer. The granulator is preferably a cylindrical granulator or a disc granulator.

As shown in fig. 2, the present invention further provides a sintering mixing granulation system, which adopts the above-mentioned sintering mixing granulation process, and the system comprises a batching chamber 100, a mixer 200, a granulator 300 and a sintering machine 400, wherein the batching chamber 100 is used for weighing and proportioning each principle, the mixer 200 is used for mixing iron raw materials, flux, fuel and steel mill waste in proportioned raw materials to form premixed raw materials, the granulator 300 is used for mixing and granulating the obtained premixed raw materials and proportioned return ores to obtain granules, and the sintering machine 400 is used for sintering the obtained granules to obtain sintered materials.

The sinter mix granulation system is described in more detail below.

As shown in fig. 2, the batching chamber 100 is provided with an iron raw material bin 110, a flux bin 120, a fuel bin 130, a steel mill scrap bin 140, a return ore bin 150 and a dosing device 160. The iron raw material bin 110, the flux bin 120, the fuel bin 130, the steel mill scrap bin 140, the return fines bin 150, and the dosing device 160 are all plural. Specifically, the iron raw material bin 110 includes a magnetite bin, a hematite bin, a limonite bin, and a siderite bin; the flux bin 120 comprises a limestone bin, a dolomite bin, a quicklime bin, a slaked lime bin and a serpentine bin; the fuel bins 130 include anthracite bins and coke breeze bins; the steel mill waste bin 140 includes a rolled steel sheet bin and a fly ash bin; the return bunker 150 includes a sintered return bunker 150 and a blast furnace return bunker 150. The quantitative feeding device 160 is installed at the discharge port of each bin to quantitatively weigh the raw materials in the corresponding bin during the discharging process of the bin, so that the required raw material amount can be accurately obtained according to different sintering formulas. Wherein, a first conveying device 610 is arranged below the discharge ports of the iron raw material bin 110, the flux bin 120, the fuel bin 130 and the steel mill waste bin 140, and a second conveying device 620 is arranged below the discharge port of the return ore bin 150. The first and second conveyors 610 and 620 are belt conveyors, but pipes may be used as the first and second conveyors 610 and 620, if necessary. The number of the first conveying device 610 may be one or more, in this embodiment, the number of the first conveying device 610 is one, the iron raw material bin 110, the flux bin 120, the fuel bin 130 and the steel mill scrap bin 140 are arranged above the first conveying device 610 side by side, and the conveying of the materials in the bins is completed by the first conveying device 610. Of course, when there are a plurality of first conveying devices, one conveying device may be separately provided for each of the raw material bin 110, the flux bin 120, the fuel bin 130, and the steel mill scrap bin 140, and the conveying of the raw materials in the bins may be completed.

As shown in fig. 2, the mixer 200 is used for mixing the raw materials, the mixer 200 has a feed inlet of the mixer 200, a discharge outlet of the mixer 200, and a first feeding device 610 connected to the feed inlet of the mixer 200 to convey the iron raw materials quantitatively weighed in the iron raw material bin 110, the flux quantitatively weighed in the flux bin 120, the fuel quantitatively weighed in the fuel bin 130, and the steel mill waste quantitatively weighed in the steel mill waste bin 140 to the mixer 200 for mixing and stirring, the first feeding device is connected to a first water pipe 510, and the first pipe 510 is connected to a water source to add a proper amount of water during the mixing and stirring process, thereby preventing the materials in the mixer 200 from being layered. The premixed raw materials are obtained after mixing and stirring by a mixer 200. A third conveying device 630 is arranged below the discharge port of the mixer 200, and the third conveying device 630 is used for conveying the premixed raw materials obtained in the mixer 200. The mixer 200 may be a vertical mixer, a horizontal mixer, or a cylindrical mixer. The third conveyor 630 is a belt conveyor, but a pipe may be used as the third conveyor 630 if necessary.

As shown in fig. 2, the granulator 300 is used for pelletizing after mixing the raw materials, and the granulator 300 has a feeding hole of the granulator 300, a discharging hole of the granulator 300, a second water adding hole and a steam inlet. The third conveying device 630 is connected to a feeding port of the granulator 300 to convey the pre-mixed raw material obtained by mixing in the mixer 200 to the granulator 300, meanwhile, the second conveying device 620 is also connected to the feeding port of the granulator 300 to convey the return ores quantitatively weighed in the return ore bin 150 to the granulator 300, the second water feeding port is connected to the second water conveying pipe 520, the second water conveying pipe 520 is connected to a water source, the steam inlet is connected to the steam pipe 530, and the steam pipe 530 is connected to a steam source, so that during granulation, a proper amount of water and steam are fed into the granulator 300 to wet the pre-mixed raw material and the return ores, the temperature of the raw material is raised, and an over-wetting phenomenon is prevented. The pellets were obtained after granulation in the granulator 300. A fourth conveying device 640 for conveying the granules is arranged below the discharge port of the granulator 300. The granulator can be a cylinder granulator or a disc granulator.

In this embodiment, the second conveying device 620 is connected to the third conveying device 630, so that the return ores conveyed by the second conveying device 620 fall on the third conveying device 630 and are conveyed to the feeding port of the granulator 300 by the third conveying device 630, so that the return ores can be preliminarily mixed with the premixed raw materials on the third conveying device 630 in the granulator 300, and the mixing efficiency and the granulating efficiency of the granulator 300 can be improved.

As shown in fig. 2, the sintering machine 400 is used for sintering pellets, and the fourth conveying device 640 is connected to the feed inlet of the sintering machine 400 to convey the pellets into the sintering machine 400, so that the desired sintered material is obtained after sintering by the sintering machine 400. The fourth conveying device 640 is a belt conveyor, but a pipe may be used as the fourth conveying device 640 if necessary.

Because the return ores are sintering return ores and/or blast furnace return ores and are high-strength and high-hardness return ores, the sintering mixing granulating system directly conveys quantitative return ores in the return ore bin 150 to the granulator 300 by additionally arranging the second conveying device 620, and the second conveying device 620 is connected with the return ore bin 150 and the granulator 300 and is mixed and granulated with the premix output by the mixer 200, so that the abrasion of the mixer 200 caused by adding the return ores in the mixer 200 in the prior art is avoided, and the service life of the mixer 200 is prolonged. Meanwhile, return ores are removed from the mixer 200, so that the total weight of raw materials in the mixer 200 is reduced, and the mixing effect of the mixer 200 is improved.

As shown in fig. 2, a water spray 540 is provided on the second conveyor 620, and the water spray 540 is connected to a water source through a pipe. The water spray device 540 sprays water to the second conveyor 620 to pre-wet the return fines prior to entering the granulator 300. Thereby increasing the forming speed of pellets in the granulator 300 and preventing the premixed raw materials from being rapidly attached to the surface of the return ores due to insufficient wetting of the return ores after the return ores enter the granulator 300.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.