CN113897470A - Novel process method for cooperatively treating hazardous waste hw18 by converter - Google Patents
Novel process method for cooperatively treating hazardous waste hw18 by converter Download PDFInfo
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- CN113897470A CN113897470A CN202110967174.5A CN202110967174A CN113897470A CN 113897470 A CN113897470 A CN 113897470A CN 202110967174 A CN202110967174 A CN 202110967174A CN 113897470 A CN113897470 A CN 113897470A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Materials Engineering (AREA)
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- Mechanical Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Geochemistry & Mineralogy (AREA)
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a novel process method for cooperatively treating hazardous waste hw18 by a converter, which comprises the steps of firstly pretreating incineration residue hw18, and screening or ball pressing the incineration residue hw18 for multiple times to enable the incineration residue to meet the use requirements. Then, mixing the hw18 meeting the requirements with slag charge according to a certain proportion, and finally, feeding the mixture and the scrap steel into a converter together to be used as an auxiliary bottom charge for steelmaking. The novel process method for the converter-cooperative treatment of the hazardous waste hw18 does not need the investment of new equipment and the change of the original converter process, and has the advantages of thorough treatment, low treatment cost and simple process and operation.
Description
Technical Field
The invention relates to the field of chemical production, in particular to a novel process method for cooperatively treating hazardous waste hw18 by using a converter.
Background
The hazardous waste such as the hw18 incineration disposal residue (772-.
Introduction of the prior disposal technology:
resource utilization: and (4) recycling valuable heavy metals in the incineration residue, such as acid extraction, alkali extraction, complexing agent extraction, biological extraction and the like. Typical process-sulfuric acid dissolution, filter pressing to remove mud, and oxidation reaction of filtrate to remove iron; 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 incineration residue 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.
Curing and landfill disposal: and the incineration residue is solidified and then enters a special landfill for landfill. The advantages are that: all varieties hw18 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, the large amount of hw18 incineration residue is not filled in the landfill in a large capacity, and the disposal cost is high.
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 curing is complete, and the variety of hw18 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.
Other treatment processes comprise: the incineration residue is proportioned according to a certain proportion, and the final product is a vitrified foam heat-insulating product by utilizing the existing thermal kiln. The advantages are that: the solidification is complete, and the incineration residue hw18 can be treated. The disadvantages are as follows: professional equipment needs to be invested, and the investment is huge; the process is complex, and the disposal quantity is small; the disposal cost is high; the product yield is low, the output value is low, and the economic benefit of enterprises is poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel process method for the converter to cooperatively treat hazardous waste hw18 aiming at the defects of the prior art.
The invention realizes the purpose through the following technical scheme: a new process method for the converter cooperative disposal of hazardous waste hw18 is characterized in that: the method comprises the following steps:
(1) pretreatment: screening or ball pressing treatment is carried out on the incineration residue hw 18;
(2) proportioning according to the proportion: mixing the pretreated incineration residue hw18 with slag, wherein the proportion of the incineration residue hw18 is 4% of the slag;
(3) converter steelmaking: and (3) feeding the mixed incineration residue hw18 and scrap steel into a converter together to be used as a bedding material for steelmaking.
As a further optimization scheme of the invention, the pretreatment of the step (1) comprises the following steps:
(1.1) primary screening: screening the incineration residue hw18 for the first time, and transporting the hw18 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 hw18 meeting the requirements of the primary screening, and transporting the hw18 meeting the requirements of the secondary screening to a stacking area for draining and storing;
(1.3) three screens: the drained hw18 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 products I are used for incineration; weighing the undersize product I and the auxiliary materials according to batch proportioning;
(1.4) pressing balls: weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a ball pressing device to prepare an oval ball shape;
(1.5) four screenings: screening the oval incineration residues hw18 by using a screen, and incinerating oversize products; and stirring and pressing the second sieved material again.
Further optimizing the scheme, the step (1.3) is carried out three times of screening, and the method comprises the following steps:
(1.31) rinsing: and after the incineration residues hw18 are transported to a pretreatment site in a closed manner, the site where the incineration residues hw18 are stacked is washed, and sewage enters a sewage collection system.
As a further optimized scheme of the invention, the converter steelmaking in the step (3) comprises the following steps:
(3.1) smelting: after the mixed incineration residues hw18 and waste steel enter a converter together to serve as a bottom material, molten iron is added into the converter, oxygen is blown into the converter for smelting, and after the smelting is finished, the molten steel is poured out to leave steel slag;
(3.2) steel slag treatment: and (3) carrying out slag splashing and furnace protection on the molten steel slag, pouring the steel slag into a slag tank after slag splashing is finished, and carrying out water cooling, crushing and magnetic separation on the steel slag in a treatment system to obtain a finished product.
As a further optimization scheme of the invention, the oxygen blowing smelting temperature of the converter is 2000 ℃, and the smelting time is 30 minutes.
According to a further optimization scheme, the auxiliary material is CaO, and the auxiliary material accounts for 20% of the first undersize product.
Compared with the prior art, the invention has the following beneficial effects:
the HW18 sludge mainly contains inorganic compounds such as SiO2, AL2O3, CaO, FeO and the like and a small amount of heavy metals, and the HW18 incineration residue has similarity with the components of sintered ore, so that the 50% of the usage amount of the sintered ore can be replaced. After the bottom slag, molten iron, waste steel and other slagging agents are subjected to steelmaking reaction, part of high-oxygen potential heavy metals in the bottom slag are reduced and then enter molten steel to become trace elements in the molten steel, the rest of the bottom slag enters a steel slag system, and the product quality reaches the technical index of the steel slag in cement, so that the characteristics of recycling and dangerous waste are eliminated. 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 converter steelmaking process, the existing process of the iron and steel enterprises is not changed, and the treatment time is short.
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, and the energy is fully utilized.
Drawings
FIG. 1 is a schematic flow chart of a novel process for the converter co-processing of hazardous waste hw 18;
FIG. 2 is a schematic flow chart of the pretreatment step in the new process for the converter co-processing of hazardous waste hw 18;
FIG. 3 is a schematic flow chart of the converter steelmaking step in the new process for the converter co-processing of the hazardous waste hw 18.
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 converter to cooperatively treat the hazardous waste hw18 has no additional equipment in the process flow of the converter, and the pretreatment is additionally provided with partial equipment for blocking or pressing balls. The incineration residue hw18 blocks or balls are used as raw materials to be smelted in a converter, and because the components of the bottom slag are close to those of the sintered ore used as a cooling agent and a slagging agent in the original process, the bottom slag can replace 50% of the usage amount of the sintered ore. After the bottom slag, molten iron, waste steel and other slagging agents are subjected to steel-making reaction, part of high-oxygen potential heavy metals in the bottom slag are reduced and then enter molten steel to become trace elements in the molten steel, and the rest of the bottom slag enters a steel slag system, so that the product quality reaches the technical index of 'steel slag used in cement' (YB/T022-2008) for the steel slag used in the cement, and the characteristics of recycling and dangerous waste are eliminated.
The new process method for the converter-co-disposal of the hazardous waste hw18 shown in fig. 1 specifically comprises the following steps:
(1) pretreatment: screening or ball pressing treatment is carried out on the incineration residue hw 18. Wherein, the pretreatment of the step (1) comprises the following steps, as shown in fig. 2.
(1.1) primary screening: and (4) screening the incineration residue hw18 for the first time, and transporting the hw18 with the appearance and the components meeting the requirements to a pretreatment site in a closed manner.
(1.2) secondary screening: and carrying out secondary screening on the hw18 meeting the requirements of the primary screening, and transporting the hw18 meeting the requirements of the secondary screening to a stacking area for draining and storing.
(1.3) three screens: the drained hw18 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 products I are used for incineration; and weighing the undersize product I and the auxiliary materials according to the batch proportioning, wherein the auxiliary materials account for 20% of the undersize product. Wherein, the step (1.3) comprises the following steps.
(1.31) rinsing: and after the incineration residues hw18 are transported to a pretreatment site in a closed manner, the site where the incineration residues hw18 are stacked is washed, and sewage enters a sewage collection system.
(1.4) pressing balls: and weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a ball pressing device to prepare an oval ball shape.
(1.5) four screenings: screening the oval incineration residues hw18 by using a screen, and incinerating oversize products; and stirring and pressing the second sieved material again.
(2) Proportioning according to the proportion: and mixing the pretreated incineration residue hw18 with slag, wherein the proportion of the incineration residue hw18 is 4% of the slag.
(3) Converter steelmaking: and (3) feeding the mixed incineration residue hw18 and scrap steel into a converter together to be used as a bedding material for steelmaking. Wherein, the step (3) comprises the following steps, as shown in fig. 3.
(3.1) smelting: and (3) after the mixed incineration residues hw18 and the scrap steel enter a converter together to serve as a bedding material, adding molten iron into the converter, blowing oxygen by the converter for smelting, pouring out the molten iron after smelting is finished, and leaving steel slag, wherein the oxygen blowing smelting temperature of the converter is about 2000 ℃, and the smelting time is 30 minutes.
(3.2) steel slag treatment: and (3) carrying out slag splashing and furnace protection on the molten steel slag, pouring the steel slag into a slag tank after slag splashing is finished, and carrying out water cooling, crushing and magnetic separation on the steel slag in a treatment system to obtain a finished product.
To sum up, the flow of the preprocessing step includes: firstly, the incineration residue hw18 is subjected to appearance and component analysis, and is transported to a pretreatment site according with requirements. After entering the field, the components and the moisture are analyzed in batches, and the components are unloaded to a raw material stacking area by the electric hoist according with the requirements. The raw materials are stored for 2-3 days in a stacking area, after the moisture is basically drained, the raw materials are lifted to a large storage bin through an electric hoist, a 100mm grid is arranged at the top of the large storage bin, a vibrating screen is arranged at the bottom of the large storage bin, after the materials pass through the vibrating screen, oversize products and oversize products at the top of the large storage bin are stacked in a concentrated mode, the oversize products and the oversize products are conveyed to a converter for disposal and utilization, undersize products and auxiliary materials are weighed according to batch ingredients, enter a conveying belt (an electromagnetic iron remover is reserved in the belt area), and are conveyed to a stirrer through a belt machine to be uniformly stirred. And (3) feeding the uniformly stirred materials into a ball pressing device, pressing the uniformly stirred materials into elliptical balls with the diameter of 50mm 36mm 25.5mm, stacking oversize materials into a finished product area, returning undersize materials to a stirring machine, then feeding the undersize materials into a belt conveyor, and continuously feeding the undersize materials into a ball pressing system. The pretreatment system is also provided with a cloth bag for dust removal and catching on-site dust.
The throttling range of the incineration residue hw18 entering the steelmaking ring of the converter comprises the following steps: firstly, shoveling the waste steel into a waste steel hopper according to a proportion on site in the steelmaking process, wherein incineration residue hw18 accounts for about 4% of slag making materials, then, entering the converter together with the waste steel as a bedding material, adding molten iron into the subsequent converter, blowing oxygen to smelt in the converter, pouring the molten steel for smelting for about 30 minutes at the temperature of about 2000 ℃, splashing the rest molten steel slag to protect the furnace, pouring the steel slag into a slag tank after splashing, entering the steel slag into a treatment system, performing water spraying cooling, crushing, magnetic separation and leaving the finished product out of the factory. And the molten steel needing secondary refining is transported to other refining devices by a crane for further refining treatment, and then is added with a heat preservation agent and sent to continuous casting.
The co-processing of the incineration residues is consistent with the steelmaking process of the converter, each converter can co-process the incineration residues, the processing time and the steelmaking smelting time are synchronous, and the pretreated incineration residues are transported to a newly-built warehouse of a steel plant by a truck. The method is characterized in that weighing configuration is carried out by a weighing hoisting device according to the production technical management requirements of a steel plant and the required operation standards, incineration residues hw18 are conveyed to a steel scrap hopper and weighed together with other steel scraps to meet the total weight requirements of the steel scraps, and then the incineration residues are waited to be hoisted by a converter crane and conveyed into the converter for absorption. During smelting, high-temperature molten iron from a blast furnace by a torpedo car is firstly added into a molten iron pretreatment device for treatment, then the molten iron is added into a converter, the temperature of the molten iron is above 1300 ℃, weighed scrap steel and incineration residues hw18 are added, then a furnace body is shaken to be vertical, an oxygen blowing pipe is descended for oxygen supply blowing, oxygen in the furnace reacts with elements such as carbon, manganese, silicon and the like in the molten iron, the temperature of raw materials is increased from 1300 ℃ to about 2000 ℃ of theoretical temperature, and the incineration residues are slagging at the high temperature. According to the furnace condition and the type of the required steel grade, a small amount of bulk materials such as lime, ferroalloy and the like are added into the converter. The flux reacts with certain elements in the furnace to generate steel slag, oxygen blowing is stopped after the temperature and the components of the molten steel are qualified, and the steel discharged from the converter is sent into a ladle to be refined by a refining device according to the requirements of steel types or directly sent to a continuous casting workshop for casting.
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.
Claims (6)
1. A new process method for the converter cooperative disposal of hazardous waste hw18 is characterized in that: the method comprises the following steps:
(1) pretreatment: screening or ball pressing treatment is carried out on the incineration residue hw 18;
(2) proportioning according to the proportion: mixing the pretreated incineration residue hw18 with slag, wherein the proportion of the incineration residue hw18 is 4% of the slag, and after the mixing is finished, performing moisture removal treatment on the hw18 and the slag again;
(3) converter steelmaking: and (3) feeding the mixed incineration residue hw18 and scrap steel into a converter together to be used as a bedding material for steelmaking.
2. The new process method for the converter-co-disposal of hazardous waste hw18 in accordance with claim 1, characterized in that: the pretreatment in the step (1) comprises the following steps:
(1.1) primary screening: screening the incineration residue hw18 for the first time, and transporting the hw18 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 hw18 meeting the requirements of the primary screening, and transporting the hw18 meeting the requirements of the secondary screening to a stacking area for draining and storing;
(1.3) three screens: the drained hw18 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 products I are used for incineration; weighing the undersize product I and the auxiliary materials according to batch proportioning;
(1.4) pressing balls: weighing the undersize product I and the auxiliary materials according to batch proportioning, stirring and feeding into a ball pressing device to prepare an oval ball shape;
(1.5) four screenings: screening the oval incineration residues hw18 by using a screen, and incinerating oversize products; and stirring and pressing the second sieved material again.
3. The new process method for the converter co-processing hazardous waste hw18, according to claim 2, is characterized in that: and (3) carrying out screening for three times, wherein the screening comprises the following steps:
(1.31) rinsing: and after the incineration residues hw18 are transported to a pretreatment site in a closed manner, the site where the incineration residues hw18 are stacked is washed, and sewage enters a sewage collection system.
4. The new process method for the converter-co-disposal of hazardous waste hw18 in accordance with claim 1, characterized in that: and (3) converter steelmaking, which comprises the following steps:
(3.1) smelting: after the mixed incineration residues hw18 and waste steel enter a converter together to serve as a bottom material, molten iron is added into the converter, oxygen is blown into the converter for smelting, and after the smelting is finished, the molten steel is poured out to leave steel slag;
(3.2) steel slag treatment: and (3) carrying out slag splashing and furnace protection on the molten steel slag, pouring the steel slag into a slag tank after slag splashing is finished, and carrying out water cooling, crushing and magnetic separation on the steel slag in a treatment system to obtain a finished product.
5. The novel process method for the converter-co-disposal of hazardous waste hw18, according to claim 4, is characterized in that: the oxygen blowing smelting temperature of the converter is 2000 ℃, and the smelting time is 30 minutes.
6. The new process method for the converter co-processing hazardous waste hw18, according to claim 2, is characterized in that: the auxiliary material is CaO, and the auxiliary material accounts for 20% of the first undersize product.
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| CN202110967174.5A CN113897470A (en) | 2021-08-23 | 2021-08-23 | Novel process method for cooperatively treating hazardous waste hw18 by converter |
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| CN202110967174.5A CN113897470A (en) | 2021-08-23 | 2021-08-23 | Novel process method for cooperatively treating hazardous waste hw18 by converter |
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| JPH10309556A (en) * | 1997-05-13 | 1998-11-24 | Takuma Co Ltd | Treatment of incineration residue |
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2021
- 2021-08-23 CN CN202110967174.5A patent/CN113897470A/en not_active Withdrawn
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|---|---|---|---|---|
| JPH10309556A (en) * | 1997-05-13 | 1998-11-24 | Takuma Co Ltd | Treatment of incineration residue |
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| CN107099658A (en) * | 2017-05-12 | 2017-08-29 | 中南大学 | A kind of method of Ore Sintering Process disposal of resources garbage flying ash |
| CN107159678A (en) * | 2017-05-12 | 2017-09-15 | 中南大学 | Agglomeration for iron mine collaboration processing garbage flying ash process bioxin control methods |
| CN107363072A (en) * | 2017-06-30 | 2017-11-21 | 中国恩菲工程技术有限公司 | The fused bath smelting method of waste |
| CN112442589A (en) * | 2019-08-29 | 2021-03-05 | 宝山钢铁股份有限公司 | Method and system for co-processing waste incineration fly ash and zinc-containing dust and mud of iron and steel plant |
| CN111515224A (en) * | 2020-04-28 | 2020-08-11 | 北京环丁环保大数据研究院 | Garbage fly ash treatment method |
| CN112113223A (en) * | 2020-08-24 | 2020-12-22 | 浙江天象环境服务有限公司 | Method for cooperatively treating industrial hazardous waste by utilizing steel mill kiln |
Non-Patent Citations (1)
| Title |
|---|
| 王彩云 等: "《钢铁炉窑协同处置危险废物类别的适宜性探讨》", 《工业安全与环保》 * |
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Application publication date: 20220107 |