CN110669942A - Method for treating zinc-containing dust in steel plant - Google Patents
Method for treating zinc-containing dust in steel plant Download PDFInfo
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- CN110669942A CN110669942A CN201910938858.5A CN201910938858A CN110669942A CN 110669942 A CN110669942 A CN 110669942A CN 201910938858 A CN201910938858 A CN 201910938858A CN 110669942 A CN110669942 A CN 110669942A
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- 239000011701 zinc Substances 0.000 title claims abstract description 128
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 91
- 239000000428 dust Substances 0.000 title claims abstract description 89
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000000843 powder Substances 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 43
- 239000002893 slag Substances 0.000 claims abstract description 41
- 229910052742 iron Inorganic materials 0.000 claims abstract description 36
- 238000003723 Smelting Methods 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000003034 coal gas Substances 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002918 waste heat Substances 0.000 claims abstract description 10
- 239000004615 ingredient Substances 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 8
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 241000196324 Embryophyta Species 0.000 claims description 24
- 238000011084 recovery Methods 0.000 claims description 12
- 239000000571 coke Substances 0.000 claims description 7
- 241001232253 Xanthisma spinulosum Species 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000010881 fly ash Substances 0.000 description 15
- 239000002956 ash Substances 0.000 description 11
- 238000002156 mixing Methods 0.000 description 10
- 239000011812 mixed powder Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000009931 harmful effect Effects 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000001698 pyrogenic effect Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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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
- C22B7/02—Working-up flue dust
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
-
- 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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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a method for treating zinc-containing dust in an iron and steel plant, which comprises the steps of preparing the zinc-containing dust generated in the iron and steel plant into a mixture with the Zn content of more than or equal to 2 wt%, the C content of more than or equal to 20 wt%, CaO/SiO20.45-1.05 percent of powder with the water content less than or equal to 3 weight percent for standby; feeding the powder into a vortex smelting device, simultaneously respectively introducing hot air and supplementary coal gas tangentially into the smelting device to ensure that the powder forms high-speed vortex smelting in the furnace along with the air flow, the smelting temperature reaches 1400-1600 ℃, zinc in the powder is reduced to enter furnace gas, and molten iron slag flows down along the furnace wall to enter a furnace bottom molten pool; the discharged zinc-containing furnace gas is subjected to waste heat recoveryPerforming coarse dust removal and bag dust removal treatment to finally obtain zinc-rich powder with the Zn content of more than 50%; and returning the coarse dedusting ash produced by coarse dedusting to the ingredient for recycling, obtaining liquid molten iron and slag from a furnace bottom molten pool, and performing pretreatment on the liquid molten iron and the slag to enter the steel production flow. The invention directly uses powder as raw material, and does not need the processes of raw material forming and granulating, thereby simplifying the processing technology.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for treating zinc-containing dust in a steel plant.
Background
In recent years, environmental protection has become a social consensus, national regulations on industrial dust emission are becoming strict, especially the pressure of important steel enterprises is increased, dust removal facilities in each process are increasing and upgrading, and the quantity of dust collection is also increasing continuously. Generally, dust generated by iron-making, steel-rolling and other processes of iron and steel enterprises accounts for about 10% of total steel yield, the dust often contains a large amount of iron and carbon and has high utilization value, the dust is generally returned to sintering as a batching in a traditional mode to realize internal recovery of the enterprises, but part of the dust contains high harmful elements such as zinc, direct recovery enables the zinc to be continuously and circularly enriched in a production system, particularly leads to excessive zinc load of a blast furnace, and causes great harmful effects on stable and smooth running of the blast furnace and safe and long life, so direct recovery of the part of zinc-containing dust must be avoided, and on the other hand, the quality fluctuation of the zinc-containing dust is large, and the dust is generally not favored by zinc-making enterprises, so how to effectively treat the zinc-containing dust is always an important subject in the industry.
At present, some industrial treatment technologies exist at home and abroad, and the literature reports comprise conventional ore dressing technologies, wet technologies (mainly including acid leaching and alkali leaching), and pyrogenic technologies (mainly including rotary kilns, rotary hearth furnaces, shaft furnaces, small blast furnaces and the like). In general, beneficiation processes are generally used as pretreatment processes for wet or pyrogenic processes; the wet process has the advantages of relatively low energy consumption and low equipment investment, but the leaching agent is more consumed, the production efficiency is lower, the impurity removal process steps are complicated, the problems of serious equipment corrosion, easy secondary pollution caused by leaching slag and the like generally exist, the wet process is more suitable for treating dust with higher zinc content (15 percent), and the research on the aspect of treating electric furnace dust by using the wet process is more generally used in China; the fire process is a widely familiar and popular processing method for iron and steel enterprises, the basic principle is to add reducing agent to reduce, volatilize and enrich and recover zinc in dust, the typical examples are several technologies of a rotary kiln, a rotary hearth furnace, a shaft furnace and a small blast furnace, and in addition, some new technologies using microwave, plasma and other means are provided, wherein the rotary kiln is more suitable for processing high-zinc electric furnace dust, otherwise, the economy may not be cost-effective, the small blast furnace is limited by the country, the processing of zinc-containing dust at home and abroad is mainly concentrated on the rotary hearth furnace and the shaft furnace process, the rotary hearth furnace process is put into operation in most domestic enterprises such as newly-day iron, Shenhu steel and the like, as well as steel-enterprise such as steel-enterprise, sand steel, sun light, Lai steel, Taiwan steel, Bao steel and the like, and the Oxycup shaft furnace process is put into operation in some enterprises such as Germany, Japan, domestic. The process has experience of successful operation, but has a plurality of problems, generally requires high investment, has complex process flow and large occupied area, and dust materials in the treatment process need to be molded and granulated, thereby increasing the production cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for treating zinc-containing dust in a steel plant, which utilizes the existing equipment in nonferrous smelting and steel industry to smelt the zinc-containing dust and reduces the harmful influence of zinc caused by the circulation of a steel system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for treating zinc-containing dust in a steel plant, which takes the zinc-containing dust as a raw material and obtains zinc-rich powder through vortex melting, comprises the following steps:
(1) zinc-containing dust generated in steel and iron plants is prepared into a mixture with the Zn content more than or equal to 2 wt%, the C content more than or equal to 20 wt%, and CaO/SiO20.45-1.05 percent of powder with the water content less than or equal to 3 weight percent for standby;
(2) feeding the powder into a vortex smelting device, simultaneously respectively introducing hot air and supplementary coal gas tangentially into the smelting device to ensure that the powder forms high-speed vortex smelting in the furnace along with air flow, wherein the smelting temperature reaches 1400-1600 ℃, the powder is fully contacted with furnace gas to be rapidly heated and thrown to a furnace wall to form a hot slag film, zinc in the powder is reduced out and enters the furnace gas under high temperature and reducing atmosphere, and molten iron slag flows down along the furnace wall and enters a furnace bottom molten pool;
(3) zinc-containing furnace gas discharged from the vortex smelting device is subjected to waste heat recovery, coarse dust removal and bag dust removal treatment, and finally zinc-rich powder with the Zn content of more than 50 wt% is obtained; and returning the coarse dedusting ash produced by coarse dedusting to the ingredient for recycling, obtaining liquid molten iron and slag from a furnace bottom molten pool, and performing pretreatment on the liquid molten iron and the slag to enter the steel production flow.
The zinc-containing dust in the step (1) comprises at least two of blast furnace, converter and electric furnace zinc-containing dust collected by a dry or wet dust removal process;
the Zn content in the zinc-containing dust of the blast furnace, the converter and the electric furnace is 1-30 wt%, the zinc-containing dust collected by dry dedusting can be directly mixed, the zinc-containing dust collected by wet dedusting needs to be dried until the moisture is less than or equal to 3 wt%, and the zinc-containing dust is crushed to the particle size of less than or equal to 1 mm.
The vortex smelting device in the step (2) is a vortex furnace or a flash furnace; hot air and supplementary coal gas are directly introduced from a steel plant production system and are respectively introduced tangentially at the wind speed of 100-150 m/s; the hot air temperature is 350-450 ℃, and the hot air quantity is 3500-4500 m per ton of powder charged into the furnace3The supplementary coal gas amount is 500-1500 m per ton of powder entering the furnace3The supplementary gas is one or a mixture of converter gas and coke oven gas of a steel plant.
The zinc powder-containing vortex smelting principle is as follows: zinc-containing powder particles rotate at high temperature and high speed in the rotational flow of the vortex smelting device to form extremely superior chemical kinetic conditions, are thrown to a furnace wall while being rapidly heated, are melted and adhered to the furnace wall to form a liquid slag film, and form a weak reducing atmosphere region because the concentration of furnace burden near the furnace wall is high and hot air is relatively insufficient, so that zinc is reduced to enter furnace gas to realize separation from the furnace burden. In order to ensure the smelting effect, certain supplementary coal gas is introduced, the coal gas is preferentially combusted to provide enough heat, meanwhile, the powder entering the furnace contains excessive carbon, a small amount of carbon also participates in combustion, most of the carbon participates in the reduction reaction of iron oxide and zinc oxide in a molten slag film, the zinc volatilized by reduction is discharged along with the airflow of a vortex furnace, zinc-rich powder with the Zn content of more than 50% is obtained through waste heat recovery and dust removal treatment, the molten iron slag slowly flows down along the furnace wall to enter a furnace bottom molten pool, liquid molten iron and molten slag rich in FeO are obtained, the zinc-rich powder can be sold to zinc smelting enterprises, and the molten iron and the molten slag enter normal steel production processes through pretreatment.
Compared with the prior art, the invention has the beneficial effects that:
1. the zinc-containing dust in the steel plant is treated by vortex smelting, the powder is directly used as the raw material, and the raw material forming and granulating processes are not needed, so that the treatment process is simplified, and the harmful influence of zinc caused by the circulation of a steel system is reduced.
2. The existing equipment in nonferrous smelting and steel industry is fully utilized, and the used hot air, coal gas and the like are also directly taken from the original steel production system, so that the production cost is reduced.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
a method for treating zinc-containing dust in a steel plant, which takes the zinc-containing dust as a raw material and obtains zinc-rich powder through vortex melting, comprises the following steps:
(1) zinc-containing dust generated in steel and iron plants is prepared into a mixture with the Zn content more than or equal to 2 wt%, the C content more than or equal to 20 wt%, and CaO/SiO20.45-1.05 percent of powder with the water content less than or equal to 3 weight percent for standby;
(2) feeding the powder into a vortex smelting device, simultaneously respectively introducing hot air and supplementary coal gas tangentially into the smelting device to ensure that the powder forms high-speed vortex smelting in the furnace along with air flow, wherein the smelting temperature reaches 1400-1600 ℃, the powder is fully contacted with furnace gas to be rapidly heated and thrown to a furnace wall to form a hot slag film, zinc in the powder is reduced out and enters the furnace gas under high-temperature and weak reducing atmosphere, and molten iron slag flows down along the furnace wall and enters a furnace bottom molten pool;
(3) zinc-containing furnace gas discharged from the vortex smelting device is subjected to waste heat recovery, coarse dust removal and bag dust removal treatment, and finally zinc-rich powder with the Zn content of more than 50% is obtained; and returning the coarse dedusting ash produced by coarse dedusting to the ingredient for recycling, obtaining liquid molten iron and slag from a furnace bottom molten pool, and performing pretreatment on the liquid molten iron and the slag to enter the steel production flow.
The zinc-containing dust in the step (1) comprises at least two of blast furnace, converter and electric furnace zinc-containing dust collected by a dry or wet dust removal process;
the Zn content in the zinc-containing dust of the blast furnace, the converter and the electric furnace is 1-30 wt%, the zinc-containing dust collected by dry dedusting can be directly mixed, the zinc-containing dust collected by wet dedusting needs to be dried until the moisture is less than or equal to 3 wt%, and the zinc-containing dust is crushed to the particle size of less than or equal to 1 mm.
The vortex smelting device in the step (2) is a vortex furnace or a flash furnace; hot air and supplementary coal gas are directly introduced from a steel plant production system and are respectively introduced tangentially at the wind speed of 100-150 m/s; the hot air temperature is 350-450 ℃, and the hot air quantity is 3500-4500 m per ton of powder charged into the furnace3The supplementary coal gas amount is 500-1500 m per ton of powder entering the furnace3The supplementary gas is one or a mixture of converter gas and coke oven gas of a steel plant.
Example 1
A method for treating zinc-containing dust in a steel plant specifically comprises the following steps:
1) preparing blast furnace dry dedusting ash (Zn content 15 wt%), blast furnace gravity dedusting ash (Zn content 1.5 wt%) and converter dust (Zn content 2.5%) of a steel plant into powder with Zn content 3 wt%, C content 24 wt%, CaO/SiO by mixing and uniformly mixing20.5 percent of water, 2 percent of water.
2) Feeding the mixed powder into a vortex furnace through a feeding system, and simultaneously tangentially introducing hot air and coke oven gas into the furnace at the wind speed of 120m/s, wherein the temperature of the hot air is 350 ℃, and the air quantity is 3500m per ton of powder fed into the furnace3The coal gas amount is 500m per ton of powder entering the furnace3The powder is melted in the furnace along with the airflow at a high speed and whirlpool temperature of 1400-1600 ℃, the powder is fully contacted with the furnace gas and is rapidly heated and thrown to the furnace wall to form a hot slag film, zinc in the powder is reduced out and enters the furnace gas under the high-temperature and weak reducing atmosphere, and molten slag iron slowly flows down along the furnace wall and enters the furnace bottom molten pool.
3) And (3) performing waste heat recovery, coarse dust removal and bag-type dust removal treatment on the discharged zinc-containing furnace gas to finally obtain zinc-rich powder with the Zn content of 52%, returning the coarse dust removal ash to the ingredient for recycling, smelting to obtain liquid molten iron and slag, and performing pretreatment on the liquid molten iron and slag to enter the original steel production flow.
Example 2
A method for treating zinc-containing dust in a steel plant specifically comprises the following steps:
1) mixing and uniformly mixing the fly ash (Zn content is 26 wt%), the fly ash (Zn content is 10 wt%) obtained by an electric furnace in a steel plant, the fly ash (Zn content is 10 wt%) obtained by a blast furnace dry method and the fly ash (Zn content is 1.5%) obtained by a wet converter to obtain the fly ash with the Zn content of 8 wt%, the C content of 21.2 wt%, CaO/SiO21.05, mixing powder with 3 wt% of water for later use, drying the converter fly ash in a wet method until the water content is less than 3 wt%, crushing the converter fly ash to the granularity of less than or equal to 1mm, and then mixing the materials.
2) Feeding the mixed powder into a vortex furnace through a feeding system, and simultaneously tangentially introducing hot air and converter gas into the furnace at the air speed of 100m/s, wherein the temperature of the hot air is 450 ℃, and the air quantity is 4500m per ton of powder fed into the furnace3The coal gas amount is 1500m per ton of powder entering the furnace3The powder is melted in the furnace along with the airflow at a high speed and whirlpool temperature of 1400-1600 ℃, the powder is fully contacted with the furnace gas and is rapidly heated and thrown to the furnace wall to form a hot slag film, zinc in the powder is reduced out and enters the furnace gas under the high-temperature and weak reducing atmosphere, and molten slag iron slowly flows down along the furnace wall and enters the furnace bottom molten pool.
3) And (3) performing waste heat recovery, coarse dust removal and bag-type dust removal treatment on the discharged zinc-containing furnace gas to finally obtain zinc-rich powder with the Zn content of 51%, returning the coarse dust removal ash to the ingredient for recycling, smelting to obtain liquid molten iron and slag, and performing pretreatment on the liquid molten iron and the slag to enter the original steel production flow.
Example 3
A method for treating zinc-containing dust in a steel plant specifically comprises the following steps:
1) mixing and uniformly mixing the fly ash (Zn content is 20 wt%) of the electric furnace of the steel plant and the fly ash (Zn content is 9 wt%) of the blast furnace dry method to prepare 10.3 wt% of Zn content, 22.5 wt% of C content, CaO/SiO20.65 percent of water, 2.5 percent of mixed powder for standby.
2) Feeding the mixed powder into a vortex furnace through a feeding system, simultaneously tangentially introducing hot air and supplementary coal gas (mixed gas of coke oven gas and converter gas) into the furnace at a wind speed of 110m/s, wherein the temperature of the hot air is 400 ℃, and the air quantity is 4000m per ton of powder fed into the furnace3The coal gas amount is 1000m per ton of powder entering the furnace3The powder is melted in the furnace along with the airflow at a high speed and whirlpool temperature of 1400-1600 ℃, the powder is fully contacted with the furnace gas and is rapidly heated and thrown to the furnace wall to form a hot slag film, zinc in the powder is reduced out and enters the furnace gas under the high-temperature and weak reducing atmosphere, and molten slag iron slowly flows down along the furnace wall and enters the furnace bottom molten pool.
3) And (3) performing waste heat recovery, coarse dust removal and bag-type dust removal treatment on the discharged zinc-containing furnace gas to finally obtain zinc-rich powder with the Zn content of 58%, returning the coarse dust removal ash to the ingredient for recycling, smelting to obtain liquid molten iron and slag, and performing pretreatment on the liquid molten iron and slag to enter the original steel production flow.
Example 4
A method for treating zinc-containing dust in a steel plant specifically comprises the following steps:
1) mixing and uniformly mixing the fly ash (Zn content is 19 wt%), the fly ash (Zn content is 11.5 wt%) of an electric furnace in a steel plant, the fly ash (Zn content is 11.5 wt%) of a blast furnace dry method and the fly ash (Zn content is 1.4%) of a wet converter to prepare the fly ash with the Zn content of 4.2 wt%, the C content of 20.9 wt%, and the CaO/SiO20.75 percent of mixed powder with 3 weight percent of water for standby, and the fly ash of the wet converter needs to be dried firstlyThe water content is less than 3 wt%, and the mixture is crushed to a granularity less than or equal to 1mm and then mixed.
2) Feeding the mixed powder into a vortex furnace through a blanking system, and simultaneously tangentially introducing hot air and coke oven gas into the furnace at the wind speed of 150m/s, wherein the temperature of the hot air is 370 ℃, and the air quantity is 4200m per ton of powder fed into the furnace3The coal gas amount is 750m per ton of powder entering the furnace3The powder is melted in the furnace along with the airflow at a high speed and whirlpool temperature of 1400-1600 ℃, the powder is fully contacted with the furnace gas and is rapidly heated and thrown to the furnace wall to form a hot slag film, zinc in the powder is reduced out and enters the furnace gas under the high-temperature and weak reducing atmosphere, and molten slag iron slowly flows down along the furnace wall and enters the furnace bottom molten pool.
3) And (3) performing waste heat recovery, coarse dust removal and bag-type dust removal treatment on the discharged zinc-containing furnace gas to finally obtain zinc-rich powder with the Zn content of 50%, returning the coarse dust removal ash to the ingredient for recycling, smelting to obtain liquid molten iron and slag, and performing pretreatment on the liquid molten iron and the slag to enter the original steel production flow.
Example 5
A method for treating zinc-containing dust in a steel plant specifically comprises the following steps:
1) preparing blast furnace dry dedusting ash (Zn content 15 wt%) and blast furnace gravity dedusting ash (Zn content 1.2 wt%) of steel plant into the materials of Zn content 5.2 wt%, C content 27.9 wt%, CaO/SiO20.45 percent of water, 2 weight percent of mixed powder for standby.
2) Feeding the mixed powder into a vortex furnace through a blanking system, and simultaneously tangentially introducing hot air and coke oven gas into the furnace at the wind speed of 110m/s, wherein the temperature of the hot air is 370 ℃, and the air quantity is 3800m per ton of powder fed into the furnace3The coal gas amount is 650m per ton of powder entering the furnace3The powder is melted in the furnace along with the airflow at a high speed and whirlpool temperature of 1400-1600 ℃, the powder is fully contacted with the furnace gas and is rapidly heated and thrown to the furnace wall to form a hot slag film, zinc in the powder is reduced out and enters the furnace gas under the high-temperature and weak reducing atmosphere, and molten slag iron slowly flows down along the furnace wall and enters the furnace bottom molten pool.
3) And (3) performing waste heat recovery, coarse dust removal and bag-type dust removal treatment on the discharged zinc-containing furnace gas to finally obtain zinc-rich powder with the Zn content of 54%, returning the coarse dust removal ash to the ingredient for recycling, smelting to obtain liquid molten iron and slag, and performing pretreatment on the liquid molten iron and slag to enter the original steel production flow.
The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.
Claims (4)
1. The method for treating zinc-containing dust in a steel plant is characterized in that the zinc-containing dust is used as a raw material, and zinc-rich powder is obtained through vortex smelting, and the method specifically comprises the following steps:
(1) zinc-containing dust generated in steel and iron plants is prepared into a mixture with the Zn content more than or equal to 2 wt%, the C content more than or equal to 20 wt%, and CaO/SiO20.45-1.05 percent of powder with the water content less than or equal to 3 weight percent for standby;
(2) feeding the powder into a vortex smelting device, simultaneously respectively introducing hot air and supplementary coal gas tangentially into the smelting device to ensure that the powder forms high-speed vortex smelting in the furnace along with air flow, wherein the smelting temperature reaches 1400-1600 ℃, the powder is fully contacted with furnace gas to be rapidly heated and thrown to a furnace wall to form a hot slag film, zinc in the powder is reduced out and enters the furnace gas under high temperature and reducing atmosphere, and molten iron slag flows down along the furnace wall and enters a furnace bottom molten pool;
(3) zinc-containing furnace gas discharged from the vortex smelting device is subjected to waste heat recovery, coarse dust removal and bag dust removal treatment, and finally zinc-rich powder with the Zn content of more than 50 wt% is obtained; and returning the coarse dedusting ash produced by coarse dedusting to the ingredient for recycling, obtaining liquid molten iron and slag from a furnace bottom molten pool, and performing pretreatment on the liquid molten iron and the slag to enter the steel production flow.
2. The method for treating zinc-containing dust of steel works according to claim 1, wherein the zinc-containing dust in step (1) comprises at least two of blast furnace, converter and electric furnace zinc-containing dust collected by dry or wet dust removal process;
3. the method for treating the zinc-containing dust of the steel plant according to claim 2, wherein the content of Zn in the zinc-containing dust of the blast furnace, the converter and the electric furnace is 1-30 wt%, the zinc-containing dust collected by dry dedusting can be directly mixed, the zinc-containing dust collected by wet dedusting needs to be dried until the moisture content is less than or equal to 3 wt%, and the zinc-containing dust is crushed to the dust granularity of less than or equal to 1 mm.
4. The method for treating zinc-containing dust of steel works according to claim 1, wherein the vortex melting device in the step (2) is a vortex furnace or a flash furnace; hot air and supplementary coal gas are directly introduced from a steel plant production system and are respectively introduced tangentially at the wind speed of 100-150 m/s; the hot air temperature is 350-450 ℃, and the hot air quantity is 3500-4500 m per ton of powder charged into the furnace3The supplementary coal gas amount is 500-1500 m per ton of powder entering the furnace3The supplementary gas is one or a mixture of converter gas and coke oven gas of a steel plant.
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| CN114150156A (en) * | 2021-11-30 | 2022-03-08 | 西安建筑科技大学 | Process for extracting zinc from low-grade zinc-containing dust and preparing nano zinc oxide |
| CN114645141A (en) * | 2022-03-21 | 2022-06-21 | 中冶赛迪技术研究中心有限公司 | Comprehensive recycling and disposal process for zinc and iron-containing smoke dust and slag |
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| CN114934171A (en) * | 2022-05-30 | 2022-08-23 | 山东莱钢永锋钢铁有限公司 | Recovery processing method of iron-containing dedusting ash in ferrous metallurgy |
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