阅读说明：本技术 一种高炉协同处置危废hw17的新工艺方法 (Novel process method for blast furnace co-processing hazardous waste hw17 ) 是由 鄢永普 余梦超 徐建根 曾成勇 罗文� 周浩享 曾其雄 张正冰 王莉萍 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种高炉协同处置危废hw17的新工艺方法,首先,首先,对表面处理废物hw17进行预处理,表面处理废物hw17进行多次筛选或压块处理,使其符合使用要求。然后,将符合要求的hw17与原料进行一定比例的混合,最后进入高炉冶炼。本发明的高炉协同处置危废hw17的新工艺方法,无需新设备的投入,且无需改变原有的高炉炼铁工艺,具有处置彻底,处置成本低,工艺和操作简单的优点。(The invention discloses a novel process method for the blast furnace co-processing of hazardous waste hw17, which comprises the following steps of firstly, preprocessing surface treatment waste hw17, and screening or briquetting the surface treatment waste hw17 for multiple times to enable the surface treatment waste hw to meet the use requirements. Then, mixing the hw17 meeting the requirements with the raw materials according to a certain proportion, and finally entering a blast furnace for smelting. The novel process method for the blast furnace to cooperatively treat the hazardous waste hw17 does not need to invest new equipment and change the original blast furnace ironmaking process, and has the advantages of thorough treatment, low treatment cost and simple process and operation.)

1. A novel process method for the blast furnace co-processing of hazardous waste hw17 is characterized in that: the method comprises the following steps:

(1) pretreatment: screening or briquetting the surface treatment waste hw 17;

(2) transportation and weighing: hermetically transporting the pretreated surface treatment waste hw17 to a weighing device for weighing;

(3) mixing in proportion: transporting the weighed surface treatment waste hw17 to a mixing chamber, and mixing the surface treatment waste hw17 with blast furnace raw materials to obtain a blast furnace mixture, wherein the content of the surface treatment waste hw17 is less than 5% of the blast furnace raw materials;

(4) blast furnace smelting: the mixed surface treatment waste hw17 is transported to a blast furnace for blast furnace smelting.

2. The new process method for blast furnace co-processing hazardous waste hw17 as claimed in claim 1, wherein the new process method comprises the following steps: the content of the surface treatment waste hw17 is 2% of the blast furnace mixture.

3. The new process method for blast furnace co-processing hazardous waste hw17 as claimed in claim 1, wherein the new process method comprises the following steps: the pretreatment comprises the following steps:

(1.1) primary screening: carrying out primary screening on the surface treatment waste hw17, and transporting the hw17 with the appearance and the components meeting the requirements to a pretreatment site in a closed manner;

(1.2) secondary screening: carrying out secondary screening on the hw17 meeting the requirements of the primary screening, and transporting the hw17 meeting the requirements of the secondary screening to a stacking area for storage;

(1.3) three screens: the drained hw17 is transported to the top of a large bunker by an electric single-beam crane, screening is carried out by a grid at the top of the large bunker and a vibrating screen at the discharge outlet of the large bunker, and screened oversize materials I are used as blast furnace materials; weighing the undersize product I and the auxiliary materials according to batch proportioning;

(1.4) briquetting: weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a briquetting device to prepare an oval sphere;

(1.5) four screenings: screening the oval surface treatment waste hw17 by using a screen, and taking oversize products II as blast furnace materials; and stirring and briquetting the undersize product II again.

4. The new process method for blast furnace co-processing hazardous waste hw17, according to claim 3, characterized in that: the step (1.1) further comprises the following steps:

(1.11) rinsing: after the surface treatment waste hw17 is transported to a designated site in a closed manner, the site where the surface treatment waste hw17 is stacked is washed, and sewage enters a sewage collection system.

5. The new process method for blast furnace co-processing hazardous waste hw17, according to claim 4, characterized in that: and the sewage in the sewage collection system is precipitated and then enters the mixing chamber to be mixed with the blast furnace raw material and the surface treatment waste hw 17.

6. The new process method for blast furnace co-processing hazardous waste hw17 as claimed in claim 1, wherein the new process method comprises the following steps: the initial temperature in the blast furnace is 2200 ℃ and the maximum treatment temperature in the blast furnace is 2400 ℃.

7. The new process method for blast furnace co-processing hazardous waste hw17 as claimed in claim 1, wherein the new process method comprises the following steps: the pretreatment also comprises bag dedusting.

Technical Field

The invention relates to the field of chemical production, in particular to a novel process method for cooperatively treating hazardous waste hw17 by a blast furnace.

Background

The hw17 is a heavy metal-containing surface treatment sludge (acid cleaning sludge: 336-.

Introduction of the prior disposal technology:

resource utilization: dissolving sludge by using sulfuric acid, removing sludge by filter pressing, and removing iron from filtrate through oxidation reaction; after iron removal, the filtrate is heated, reduced and filter-pressed to extract chromium hydroxide, and the chromium slag is converted into chromium production workshop to produce basic chromium sulfate; extracting copper, zinc and nickel solution from the filtrate by an organic phase; and adding sulfuric acid to back extract pure nickel sulfate, zinc and copper, and crystallizing to obtain the product. The advantages are that: the treatment is thorough; the disadvantages are as follows: professional enterprises need to be built, the process is complex, the flow is long, and the equipment investment is huge; the requirement on useful elements is high, the proportion of the useful elements is low, and the economic benefit is poor; the disposal cost is high, and the economic benefit is unstable; the treatment of resource is less dangerous and waste, and the production efficiency of enterprises is unstable.

And (3) cement kiln co-treatment: the sludge is homogenized and pretreated, and enters a cement kiln for cooperative treatment according to a certain proportion. The advantages are that: the equipment investment is low and the disposal quantity is large. The disadvantages are as follows: the existing synergistic treatment amount is large, the influence on the cement kiln capacity is large, the comprehensive benefit of a cement enterprise is not favorably obtained, the benefit driving force is reduced, the existing basic saturation is realized, and the growth amount is not large; in addition, the requirement on the content of heavy metals is strict, and the proportion is strictly controlled; finally, heavy metals enter a concrete building to be diluted and cured, and can be leached into water and soil after a long time, so that the environment is influenced.

Incineration disposal: to be pretreated and homogenized and enter a professional incinerator for incineration disposal. The advantages are that: all kinds of hw17 sludge can be sent to an incinerator for disposal. The disadvantages are as follows: a professional incineration enterprise is built, the equipment investment is large, and a tail gas treatment system needs to be matched subsequently; the sludge residue after incineration still needs professional treatment, and the treatment is not thorough; the process equipment and the operation are complex, and professional personnel are required to be equipped; the disposal cost is high.

Curing and landfill disposal: and after curing, filling the mixture into a special landfill. The advantages are that: all varieties hw17 sludge can be landfilled for curing. The disadvantages are as follows: the curing and landfill costs are high; a professional rigid landfill is needed, and the treatment in a common landfill cannot be realized; the sludge is actually kept, and the risk of environmental pollution caused by leaching after a long time is not eliminated; the professional rigid landfill site is few, and the large amount of hw17 sludge is not filled in the landfill.

Carrying out vitrification treatment in a plasma furnace: and (4) entering a plasma furnace, and adding other ingredients at high temperature to form glass body solidification. The advantages are that: the solidification is complete, and the variety of the hw17 sludge can be treated. The disadvantages are as follows: professional equipment needs to be invested, and the investment is huge; the plasma furnace has low power and low handling capacity; the disposal cost is high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a novel process method for the blast furnace to cooperatively treat dangerous waste hw17 aiming at the defects of the prior art.

The invention realizes the purpose through the following technical scheme: a novel process method for the blast furnace co-processing of hazardous waste hw17 is disclosed, wherein: the method comprises the following steps:

(1) pretreatment: screening or briquetting the surface treatment waste hw 17;

(2) transportation and weighing: hermetically transporting the pretreated surface treatment waste hw17 to a weighing device for weighing;

(3) mixing in proportion: transporting the weighed surface treatment waste hw17 to a mixing chamber, and mixing the surface treatment waste hw17 with blast furnace raw materials to obtain a blast furnace mixture, wherein the content of the surface treatment waste hw17 is less than 5% of the blast furnace raw materials;

(4) blast furnace smelting: transporting the mixed surface treatment waste hw17 to a blast furnace for blast furnace smelting;

by mixing the surface-treated waste hw17 into blast furnace raw materials to perform the blast furnace, the surface-treated waste hw17 is fully utilized without changing the original process of the blast furnace.

As a further optimization of the invention, the content of the surface treatment waste hw17 is 2% of the blast furnace mixture. If the content of the surface treatment waste hw17 is too high, too much waste is generated during the blast furnace treatment, and the product yield is also reduced.

As a further optimization of the invention, the transportation comprises the following steps:

the pretreatment comprises the following steps:

(1.1) primary screening: carrying out primary screening on the surface treatment waste hw17, and transporting the hw17 with the appearance and the components meeting the requirements to a pretreatment site in a closed manner;

(1.2) secondary screening: carrying out secondary screening on the hw17 meeting the requirements of the primary screening, and transporting the hw17 meeting the requirements of the secondary screening to a stacking area for storage;

(1.3) three screens: the drained hw17 is transported to the top of a large bunker by an electric single-beam crane, screening is carried out by a grid at the top of the large bunker and a vibrating screen at the discharge outlet of the large bunker, and screened oversize materials I are used as blast furnace materials; weighing the undersize product I and the auxiliary materials according to batch proportioning;

(1.4) briquetting: weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a briquetting device to prepare an oval sphere;

(1.5) four screenings: screening the oval surface treatment waste hw17 by using a screen, and taking oversize products II as blast furnace materials; and stirring and briquetting the undersize product II again.

As a further optimization scheme of the present invention, the step (1.1) further comprises the following steps:

(1.11) rinsing: after the surface treatment waste hw17 is transported to a designated site in a closed manner, the site where the surface treatment waste hw17 is stacked is washed, and sewage enters a sewage collection system.

As a further optimization scheme of the invention, the sewage in the sewage collecting system is precipitated and then enters the mixing chamber to be mixed with the blast furnace raw material and the surface treatment waste hw 17.

The surface treatment waste hw17 contains water, so a flushing sewage collection system is arranged, field flushing water enters a sewage collection pool, the field flushing water and the water or the objects which are flushed or thrown out due to hoisting and the like are precipitated together, clear water after precipitation enters a mixing chamber to be used as production water, and sludge in the precipitation pool directly enters a pull-type belt weigher to be weighed and recovered.

As a further optimization scheme of the invention, the initial temperature in the blast furnace is 2200 ℃, and the maximum treatment temperature in the blast furnace is 2400 ℃.

As a further optimization scheme of the invention, the pretreatment also comprises bag-type dust removal.

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

the hw17 sludge mainly contains inorganic compounds such as SiO2, AL2O3, CaO, FeO and the like and a small amount of heavy metals, is consistent with blast furnace ironmaking and slagging materials, meets the basic requirements of a blast furnace on ironmaking raw materials such as ironmaking and slagging raw materials, and can be added into the blast furnace raw materials according to a certain proportion to meet the requirements of ironmaking and slagging. And the existing equipment of the existing iron and steel enterprises is utilized, the equipment investment is basically not needed, the treatment process technology and the operation requirement are simple, the energy is fully utilized, and the hw17 sludge is disposed in place. The iron element enters molten iron and is recycled; part of heavy metals are reduced into molten iron to become trace elements, so that the resource utilization is realized, and the improvement of the variety of the molten iron is facilitated; part of heavy metal enters blast furnace slag and is vitrified and solidified to be used as building materials such as cement, brick making and the like; the tail gas enters the existing environmental treatment equipment. The method has the advantages that the characteristic of large material use amount of the iron and steel enterprises is fully exerted, the treatment amount is large, the treatment time is along with the existing blast furnace iron-making process, the existing process of the iron and steel enterprises is not changed, and the treatment time is short.

Through setting up sewage collection system, guarantee that waste water is not arranged outward, and realized the recycle of sewage.

Drawings

FIG. 1 is a schematic flow chart of a new process for the blast furnace co-processing of hazardous waste hw 17;

FIG. 2 is a schematic flow chart of the pretreatment step in the new process for blast furnace co-processing hazardous waste hw 17;

Detailed Description

The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.

Examples

The new process method for the blast furnace to cooperatively treat the hazardous waste hw17 has no additional equipment in the process flow of the blast furnace, and the pretreatment is additionally provided with partial equipment for blocking or briquetting. And (3) smelting the incineration residue hw17 blocks or balls serving as raw materials in a blast furnace.

The new process method for the blast furnace co-processing of the hazardous waste hw17 shown in fig. 1 specifically comprises the following steps:

a novel process method for the blast furnace co-processing of hazardous waste hw17 comprises the following steps:

(1) pretreatment: the surface treatment waste hw17 is subjected to screening or briquetting. As shown in fig. 2, the pretreatment includes the following specific steps.

(1.1) primary screening: and (3) carrying out primary screening on the surface treatment waste hw17, and hermetically transporting hw17 with the appearance and the components meeting the requirements to a pretreatment site.

(1.11) rinsing: after the surface treatment waste hw17 is transported to a designated site in a closed manner, the site where the surface treatment waste hw17 is stacked is washed, and sewage enters a sewage collection system.

(1.2) secondary screening: and carrying out secondary screening on the hw17 meeting the requirements of the primary screening, and transporting the hw17 meeting the requirements of the secondary screening to a stacking area for storage.

(1.3) three screens: the drained hw17 is transported to the top of a large bunker by an electric single-beam crane, screening is carried out by a grid at the top of the large bunker and a vibrating screen at the discharge outlet of the large bunker, and screened oversize materials I are used as blast furnace materials; and weighing the first undersize product and the auxiliary materials according to batch proportioning.

(1.4) briquetting: and weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a briquetting device to prepare an oval sphere.

(1.5) four screenings: screening the oval surface treatment waste hw17 by using a screen, and taking oversize products II as blast furnace materials; and stirring and briquetting the undersize product II again.

(2) Transportation and weighing: and (3) closely transporting the pretreated surface treatment waste hw17 to a weighing device for weighing.

(3) Mixing in proportion: transporting the weighed surface treatment waste hw17 to a mixing chamber, and mixing the surface treatment waste hw17 with blast furnace raw materials to obtain a blast furnace mixture, wherein the content of the surface treatment waste hw17 is less than 5% of the blast furnace raw materials;

(4) blast furnace smelting: the mixed surface treatment waste hw17 is transported to a blast furnace for blast furnace smelting.

In summary, the above steps can be summarized as that the surface treatment sludge hw17 is pretreated into briquettes or balls (1cm-10cm) as the blast furnace raw material, and the briquettes or balls enter the lower main adhesive tape of the blast furnace trough from the movable belt, then enter the feeding main adhesive tape and finally enter the blast furnace. After the smelting in the blast furnace, part of heavy metal enters molten iron to be used as trace elements, and part of heavy metal enters furnace slag.

The surface treatment waste hw17 is used as raw material to be smelted in a furnace. 50t/d of surface treatment waste is treated, the consumption proportion of the surface treatment waste accounts for 0.22 percent of the whole ore, the proportion is extremely small, and the fluctuation of total (Fe) components is about 0.1 percent, thereby meeting the fluctuation requirement of blast furnace charging on raw materials. The blast furnace in this example has an effective volume of 2500m3, an original design capacity of 400 ten thousand t/a, and an actual output of 460 ten thousand t/a. The furnace body is a thin lining structure integrating a short and fat type furnace body and a brick wall, a combined soft water closed circulating system, a double-rectangular iron tapping field, 3 tapholes, 30 air ports and three internal combustion type hot blast furnaces and one top combustion type hot blast furnace are adopted. The basic charge structure is: 80% of sintered coke, 20% of lump ore, 60% of factory dry quenching coke and 40% of outsourcing coke.

12800d/t of daily molten iron, 21000d/t of consumed ore, 2500t/d of consumed coke and 900t/d of consumed coal powder.

The surface treatment waste hw17 is used as raw material to be smelted in a furnace. 50t/d of surface treatment waste is treated, the consumption proportion of the surface treatment waste accounts for 0.22 percent of the whole ore, the proportion is extremely small, and the fluctuation of total (Fe) components is about 0.1 percent, thereby meeting the fluctuation requirement of blast furnace charging on raw materials.

In this embodiment, the blast furnace capacity, energy consumption, heavy metals of slag, heavy metals of water, and heavy metals of fly ash are monitored, and the data are as follows:

conditions of the furnace

Slag flushing water

Dry slag and granulated slag in front of furnace

Gas ash and dry ash

Dust removal ash under groove

Environmental monitoring (8.31 and 9.22)

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.