CN111850195B - Method for treating zinc-containing solid waste of steel plant by environment-friendly improved blast furnace - Google Patents
Method for treating zinc-containing solid waste of steel plant by environment-friendly improved blast furnace Download PDFInfo
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- CN111850195B CN111850195B CN202010601425.3A CN202010601425A CN111850195B CN 111850195 B CN111850195 B CN 111850195B CN 202010601425 A CN202010601425 A CN 202010601425A CN 111850195 B CN111850195 B CN 111850195B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B13/00—Obtaining lead
- C22B13/04—Obtaining lead by wet processes
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- 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
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Abstract
The invention provides an environment-friendly improved method for treating zinc-containing solid waste in a steel plant by using a blast furnace. The method selects the hot-pressed briquette, the zinc-containing dust pressing block and the mixed injection material consisting of the pulverized coal and the dust of the iron and steel plant as the blast furnace smelting raw material, and adopts the environment-friendly improved blast furnace to carry out low-stockline reduction smelting on the zinc-containing solid waste dust of the iron and steel plant, thereby reducing the extrusion damage of the upper stockpile to the lower furnace burden. And an oxygen burner is additionally arranged at the upper part of the low stockline charge level and is used for blowing normal-temperature oxygen to burn and release heat in the smelting process so as to decompose tar generated by carbonization of the hot-pressed coal. And a material injection burner is additionally arranged at the upper part of the material surface of the low material line, so that the cyclic smelting of zinc-containing solid waste in a steel plant is realized, and valuable elements in the fly ash are enriched and recovered. The invention realizes the high-efficiency, environment-friendly and low-energy-consumption recovery treatment of the zinc-containing solid waste by improving the blast furnace smelting raw material and adaptively optimizing the blast furnace structure and the smelting process aiming at the improved blast furnace raw material.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment in steel plants, and particularly relates to an environment-friendly improved method for treating zinc-containing solid waste in steel plants by using a blast furnace.
Background
The blast furnace is the most main container for iron-making production at present, and the main raw materials used are sinter, pellet, coke and a small amount of coal powder for injection. Although the high efficiency and the economy of blast furnace iron making enable the blast furnace iron making to occupy the most important position in steel smelting in China, the consumption of high-quality resources and the emission of a large amount of pollutants caused by the blast furnace bring serious challenges to energy conservation and environmental protection in China. Therefore, at present, more and more blast furnaces are developed from a single ironmaking function to the direction of the cooperative treatment of ironmaking and solid waste.
German DK waste recycling and pig iron smelting company takes converter fly ash as the main component, adds a small amount of coarse-grained iron ore powder, mixes and sinters the mixture into sintered ore, and then sends the sintered ore into a blast furnace for smelting to obtain pig iron and zinc-rich dust, and 1.7 million tons of zinc-rich dust can be produced each year (the blast furnace treats converter zinc-containing dust, world steel, 2013 (5): 8-10). In this process, the DK blast furnace has a zinc load as high as 38kg/t iron and the actual function of the blast furnace is to treat zinc containing dust, but the consumption of blast furnace reductant is high due to the zinc circulation present in the blast furnace. Most domestic iron and steel enterprises also transport iron-containing dust of iron and steel plants to the sintering process circularly, but domestic blast furnaces strictly control harmful elements in raw fuel, so that the dust recycling and sintering usage of domestic iron and steel plants are low. A few steel enterprises such as saddle steel, chen steel, Hunan steel and the like directly blow dust in steel plants into blast furnaces to achieve certain effects, but the types, the granularity and the quantity of the blown dust are strictly limited. Therefore, the existing blast furnace smelting technology for treating the zinc-containing solid waste in the steel plant has the problems of strict composition control of smelting raw materials, high energy consumption, serious pollution, low treatment efficiency and the like, and the blast furnace smelting cannot be used for treating the zinc-containing solid waste in a large-scale and high-efficiency manner.
In view of the above, the invention provides an environment-friendly improved method for treating zinc-containing solid waste in steel plants by using a blast furnace. The structure of the blast furnace smelting raw material is improved, and the blast furnace structure and the smelting process are adaptively optimized aiming at the improved blast furnace raw material, so that the zinc-containing solid waste is recovered and treated by the blast furnace smelting with high efficiency, environmental protection and low energy consumption.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an environment-friendly improved method for treating zinc-containing solid waste in a steel plant by using a blast furnace. The blast furnace smelting raw material structure is improved, and the blast furnace structure and the smelting process are adaptively optimized aiming at the improved blast furnace raw material, so that the high-efficiency, environment-friendly and low-energy-consumption blast furnace smelting is realized, and the zinc-containing solid waste is recycled and treated.
In order to achieve the purpose, the invention adopts the following technical scheme:
an environment-friendly improved blast furnace treatment method for zinc-containing solid waste of a steel plant adopts environment-friendly improved blast furnace smelting to treat zinc-containing solid waste dust of the steel plant; the blast furnace smelting adopts low-stockline operation to reduce the extrusion damage of the upper stock column to the lower furnace burden; and an oxygen nozzle and a material injection nozzle are additionally arranged at the upper part of the low stockline charge level of the blast furnace.
The environment-friendly improved blast furnace smelting comprises the following steps:
s1, preparing hot-pressed coal, zinc-containing dust briquettes and mixed injection materials consisting of coal powder and dust of an iron and steel plant respectively as raw materials for smelting by the environment-friendly improved blast furnace; the raw materials adopt hot-pressed briquette and zinc-containing dust briquettes to replace traditional coke and sinter which have high pollution and high energy consumption, and the energy-saving and emission-reducing capability during blast furnace smelting can be greatly improved.
S2, performing blast furnace smelting on the raw materials in the step S1 by adopting the low stockline operation of the environment-friendly improved blast furnace; introducing furnace top gas generated by blast furnace smelting into a dust removal system for dust removal to obtain dust removal ash and furnace top circulating gas;
blowing normal-temperature oxygen from the oxygen burner in the smelting process to burn and release heat, and decomposing tar generated by carbonization of the hot-pressed briquette;
s3, returning the furnace top circulating coal gas obtained in the step S2 from the material injection burner to the blast furnace for circulating combustion;
specifically, nitrogen is adopted to convey high-carbon fly ash during smelting, and the self-returning fly ash of the blast furnace is recycled; meanwhile, a large amount of top gas is returned to be used for blast furnace injection combustion, so that heat is supplemented, and the fuel consumption of the blast furnace is reduced.
S4, when the mass content of the valuable elements in the fly ash obtained in the step S2 is lower than 10%, blowing the valuable elements back into the blast furnace from a tuyere of the environment-friendly improved blast furnace; and when the mass content of the valuable elements is more than or equal to 10%, extracting the valuable elements in the dedusting ash by adopting a wet process.
By adopting the technical scheme, the hot-pressed briquette is adopted to replace coke in the traditional blast furnace raw material, so that the blast furnace material column framework is supported by the formed coke formed by carbonizing the hot-pressed briquette in the blast furnace. However, the strength of the formed coke is not as good as that of the coke, and a large amount of coal tar is generated in the carbonization process of the hot-pressed formed coal, so that based on the difficult problems, the design of a blast furnace operation furnace type optimization scheme and a secondary after-blow device is provided on the basis of not changing the traditional blast furnace type greatly. By adopting the low-stockline operation, the extrusion damage of the upper stockcolumn to the lower furnace burden is reduced; the oxygen burner is additionally arranged at the upper part of the burden surface of the burden line, and normal-temperature oxygen is blown to burn and release heat in the smelting process, so that tar generated by carbonization of the hot-pressed coal is decomposed, and the blockage and corrosion of a tail gas pipeline are avoided; by additionally arranging the material injection burner at the upper part of the material level of the low stockline, the top gas and part of the high-carbon dust are circularly injected into the blast furnace to supplement heat and reduce the fuel consumption of the blast furnace. Therefore, the invention can realize high-efficiency, environment-friendly and low-energy-consumption blast furnace smelting, and simultaneously recycles and treats the zinc-containing solid waste dust in the iron and steel plant.
Further, in step S1, the hot pressed briquette includes weak bond coal, coal tar pitch and biomass binder; the zinc-containing dust pressing block comprises zinc-containing solid waste dust, waste magnesia carbon bricks and bentonite in a steel plant; the mixed injection material consisting of the coal powder and the dust of the iron and steel plant comprises high-carbon and/or high-calcium dust of the iron and steel plant and blast furnace injection coal powder.
Further, the preparation method of the hot pressed briquette comprises the following steps: respectively crushing the weak bond coal and the coal tar pitch to be less than 3mm and 1mm, and then mixing the materials in percentage by mass (65-75%): (15-25%): (5% -15%) of weak caking coal, coal tar pitch and biomass binder, and preparing the hot-pressed briquette with the particle size of 40-50 mm in a high-pressure roller pair at 230-260 ℃. The weak caking coal, the coal tar pitch and the biomass binder are mixed and hot-pressed to replace coke in the traditional blast furnace, so that the use cost of the reducing agent can be reduced, and the utilization rate of low-cost raw materials can be improved.
Further, the preparation method of the zinc-containing dust briquette comprises the following steps: crushing the zinc-containing solid waste dust of the steel plant to below 1mm, and then mixing the materials in a mass ratio of (75-85%): (5-15%): (5% -15%) of the zinc-containing solid waste dust in the iron and steel plant, the waste magnesia carbon bricks and the bentonite are mixed and then are prepared into zinc-containing dust briquettes with the particle size of 20-30 mm in a high-pressure roller pair. Through mixing the suppression with the solid useless dust of zinciferous solid waste of iron and steel plant and abandonment magnesia carbon brick and bentonite, replace the sinter in traditional blast furnace, wherein, bentonite low cost, and have very strong cohesiveness and high temperature stability, can prevent that zinciferous dust briquetting is broken at the smelting in-process, leads to stock column gas permeability to reduce the scheduling problem, and then can improve blast furnace production capacity by a wide margin. The waste magnesia carbon bricks can be used for balancing the magnesium-aluminum ratio in the blast furnace slag.
Further, the mass content of the high-carbon and/or high-calcium dust in the steel plant in the mixed injection material consisting of the coal powder and the dust in the steel plant is 5-15%; the content of the mixed injection material consisting of the coal powder and the dust of the steel plant is more than or equal to 70 percent, wherein the grain size of the mixed injection material is less than 0.074 mm. High-carbon and/or high-calcium dust of a steel plant is added into the blast furnace coal powder, so that the cost of raw materials can be reduced, the utilization rate of the raw materials can be improved, and the energy-saving and emission-reducing capability of the blast furnace can be further improved.
Further, the volume of the environment-friendly improved blast furnace is 500m3～1000m3(ii) a The number of the oxygen burners is 12; the number of the material blowing burners is 4.
Further, in step S2, the dust removing system includes a gravity dust remover and a bag-type dust remover.
Further, the furnace top gas is cooled by adding cold flue gas, and then is sent to the gravity dust collector and the bag-type dust collector for dust collection, so that the dust collection ash and the furnace top circulating gas are obtained.
Further, in step S4, a wet purification process is used to enrich and recover valuable elements in the fly ash. For example, the high-purity zinc product is obtained by extracting zinc from the dedusting ash by an acid leaching method.
Further, the valuable elements include zinc and lead.
Advantageous effects
Compared with the prior art, the method for treating the zinc-containing solid waste in the steel plant by the environment-friendly improved blast furnace has the following beneficial effects:
(1) the invention provides an environment-friendly improved method for treating zinc-containing solid waste of a steel plant by a blast furnace, which selects hot-pressed briquette, zinc-containing dust briquettes and mixed injection material consisting of pulverized coal and dust of the steel plant as a blast furnace smelting raw material, and improves the structure and process of the blast furnace. The method adopts the operation of an environment-friendly improved blast furnace low-material line to smelt and circularly recover and treat zinc-containing solid waste dust in the steel plant. An oxygen burner is additionally arranged on the upper part of the low stock line stock level, so that normal-temperature oxygen is blown to burn and release heat in the smelting process, tar generated by carbonization of hot-pressed coal is decomposed, and the blockage and corrosion of a tail gas pipeline are avoided. And a material injection nozzle is additionally arranged at the upper part of the material level of the low material line, and the furnace top gas is circularly injected into the blast furnace to supplement heat and reduce the fuel consumption of the blast furnace. Finally, the high-efficiency, environment-friendly and low-energy-consumption circular smelting of zinc-containing solid waste in steel plants can be realized, and then the fly ash is enriched, recovered and purified by a wet method to obtain high-purity lead, zinc and other valuable elements.
(2) According to the method for treating the zinc-containing solid waste in the steel plant by the environment-friendly improved blast furnace, the raw materials of the blast furnace are improved, the weak caking coal, the coal tar pitch and the biomass binder are mixed and hot-pressed, the coke in the traditional blast furnace is replaced, the use cost of the reducing agent can be reduced, and the utilization rate of the low-cost raw materials is improved. Through mixing the suppression with the solid useless dust of zinciferous solid waste of iron and steel plant and abandonment magnesia carbon brick and bentonite, replace the sinter in traditional blast furnace, wherein, bentonite low cost, and have very strong cohesiveness and high temperature stability, can prevent that zinciferous dust briquetting is broken at the smelting in-process, leads to stock column gas permeability to reduce the scheduling problem, and then can improve blast furnace production capacity by a wide margin. The waste magnesia carbon bricks can be used for balancing the magnesium-aluminum ratio in the blast furnace slag. The raw materials selected by the invention have the characteristics of low price, easy obtainment and rich sources, and can reduce the cost of the raw materials, improve the utilization rate of the raw materials and further improve the energy-saving and emission-reducing capability of the blast furnace.
(3) According to the invention, by additionally arranging the material injection burner, the cyclic smelting and enrichment recovery of zinc-containing solid waste dust in the iron and steel plant can be realized, so that the content of valuable elements in the fly ash is continuously increased. When the dedusting ash is leached by a wet method to obtain a high-purity valuable element product, the extra consumption of the leaching agent can be reduced, and the purity of the leached valuable element product is obviously improved.
Drawings
FIG. 1 is a technical route diagram of the environmental-friendly improved blast furnace for treating zinc-containing solid waste in steel plants.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
An environment-friendly improved blast furnace treatment method for zinc-containing solid waste of an iron and steel plant adopts environment-friendly improved blast furnace smelting to treat zinc-containing solid waste dust of the iron and steel plant. Referring to fig. 1, the blast furnace smelting adopts a low-stockline operation to reduce the crushing damage of the upper stockpile to the lower furnace burden. The volume of the environment-friendly improved blast furnace is 500m3. 12 oxygen burners are additionally arranged on the upper part of the low stockline charge level of the blast furnace in parallel; and 4 material injection nozzles are additionally arranged on the upper part of the low stockline charge level of the blast furnace in parallel.
The improved blast furnace is adopted to smelt the zinc-containing solid waste dust in the iron and steel plant, and the specific steps are as follows:
s1, preparing hot-pressed briquette, zinc-containing dust briquettes and mixed injection materials consisting of coal powder and dust of iron and steel works respectively as raw materials for smelting in the environment-friendly improved blast furnace.
The preparation method of the hot-pressed briquette comprises the following steps: respectively crushing the weak bond coal and the coal tar pitch to be less than 3mm and 1mm, and then mixing the crushed weak bond coal and the coal tar pitch in a mass ratio of 70%: 20%: after 10% of weak caking coal, coal tar pitch and biomass binder are mixed, preparing hot-pressed briquette with the particle size of 40-50 mm in a high-pressure roller pair at 250 ℃. The weak caking coal, the coal tar pitch and the biomass binder are mixed and hot-pressed to replace coke supplied by a traditional blast furnace, so that the use cost of the reducing agent can be reduced, and the utilization rate of low-cost raw materials can be improved.
The preparation method of the zinc-containing dust briquette comprises the following steps: crushing the zinc-containing solid waste dust of the steel plant to below 1mm, and then mixing the materials in a mass ratio of 80%: 10%: after 10% of zinc-containing solid waste dust (the composition is shown in table 1) in a steel plant, waste magnesia carbon bricks and bentonite are mixed, zinc-containing dust briquettes with the particle size of 20-30 mm are prepared in a high-pressure roller pair. Through mixing the suppression with the solid useless dust of zinciferous solid waste of iron and steel plant and abandonment magnesia carbon brick and bentonite, replace the sinter in traditional blast furnace, wherein, bentonite low cost, and have very strong cohesiveness and high temperature stability, can prevent that zinciferous dust briquetting is broken at the smelting in-process, leads to stock column gas permeability to reduce the scheduling problem, and then can improve blast furnace production capacity by a wide margin. The waste magnesia carbon bricks can be used for balancing the magnesium-aluminum ratio in the blast furnace slag.
TABLE 1 chemical composition by mass of zinc-containing solid waste dust of iron and steel works
The mixed injection material consisting of the coal powder and the dust of the iron and steel plant is prepared by collecting high-carbon and high-calcium dust of the iron and steel plant, feeding the collected high-carbon and high-calcium dust and the blast furnace injection coal powder into a coal mill according to the proportion of 10 percent to prepare powder, and enabling the particle size of the mixture after powder preparation to be less than 0.074mm to be more than 70 percent.
S2, adopting the low stockline operation of the environment-friendly improved blast furnace, and adding the raw materials in the step S1 into the blast furnace through a distributor for reduction smelting; in the smelting process, zinc or lead vapor is generated by the zinc-containing solid waste dust in the steel plant in the zinc-containing dust pressing block under the reducing action of the hot pressing briquette and is discharged from the furnace top along with the furnace top gas; and then, furnace top gas generated by blast furnace smelting is added with cold flue gas for cooling, and then is sent to a gravity dust collector and a bag-type dust collector for dust removal, so that dust removal ash and furnace top circulating gas are obtained.
And blowing normal-temperature oxygen from the oxygen burner in the smelting process to burn and release heat, decomposing tar generated by carbonization of the hot-pressed coal and avoiding the blockage and corrosion of a tail gas pipeline.
And S3, returning the furnace top circulating coal gas obtained in the step S2 from the material injection burner to the blast furnace for circulating combustion.
S4, detecting and analyzing the fly ash obtained in the step S2, and blowing the fly ash into the blast furnace from the tuyere of the environment-friendly improved blast furnace when the mass content of zinc and lead in the fly ash obtained in the step S2 is lower than 10%; and when the mass content of zinc and lead is more than or equal to 10%, enriching and recovering the zinc and lead in the dedusting ash by adopting an acid leaching method.
In the embodiment, the total content of zinc and lead in the dust is more than 10% through circulating smelting in an environment-friendly improved blast furnace; and then enriching and recovering zinc and lead in the fly ash by adopting an acid leaching method. The purity of the zinc product obtained by final enrichment and recovery is more than 99.8%, the purity of the lead product is more than 99.7%, and the recovery rate of zinc and lead is as high as more than 96%.
Comparative example 1
Compared with the embodiment 1, the method for treating the zinc-containing solid waste of the steel plant by the blast furnace is different in that the zinc-containing solid waste dust of the steel plant is treated by adopting the conventional blast furnace smelting. Namely, an oxygen burner and a material injection burner are not additionally arranged on the upper part of the low stockline stock level of the blast furnace in parallel. The rest is substantially the same as that of embodiment 1, and will not be described herein.
The purity of the zinc product obtained by enriching and recovering the zinc product in the comparative example 1 is reduced to 96.9 percent, the purity of the lead product is reduced to 96.1 percent, and the recovery rate of the zinc and the lead is only 88 percent. Therefore, when the blast furnace raw material provided by the invention is adopted, if the structure and the process of the blast furnace are not optimized adaptively, the enrichment purity and the recovery rate of zinc and lead are reduced, and the high-efficiency, environment-friendly and energy-saving blast furnace smelting recovery cannot be realized. If the traditional blast furnace raw materials such as sintered ore, pellet ore, coke and coal powder injection are adopted, the recovery cost and energy consumption are high, the pollution is large, and the efficient, environment-friendly and energy-saving blast furnace smelting recovery can not be realized.
In conclusion, the invention selects the hot-pressed briquette, the zinc-containing dust briquette and the mixed injection material consisting of the coal powder and the dust of the iron and steel plant as the blast furnace smelting raw material, thereby reducing the recovery cost, improving the utilization rate of the raw material and further improving the energy-saving and emission-reducing capability of the blast furnace. Through improving the structure and the process of the blast furnace, smelting is carried out by adopting the operation of a low stockline of the environment-friendly improved blast furnace, and zinc-containing solid waste dust in the steel plant is recycled and treated. An oxygen burner is additionally arranged on the upper part of the low stock line stock level, so that normal-temperature oxygen is blown to burn and release heat in the smelting process, tar generated by carbonization of hot-pressed coal is decomposed, and the blockage and corrosion of a tail gas pipeline are avoided. And a material injection nozzle is additionally arranged at the upper part of the material level of the low material line, and the furnace top gas is circularly injected into the blast furnace to supplement heat and reduce the fuel consumption of the blast furnace. Finally, the high-efficiency environment-friendly and low-energy-consumption circular smelting of zinc-containing solid waste in steel plants can be realized, and then the fly ash is enriched and recovered to obtain high-purity and high-recovery valuable elements such as lead, zinc and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. An environment-friendly improved blast furnace treatment method for zinc-containing solid waste of a steel plant is characterized in that the zinc-containing solid waste dust of the steel plant is treated by adopting environment-friendly improved blast furnace smelting; the blast furnace smelting adopts low-stockline operation; an oxygen burner and a material injection burner are additionally arranged at the upper part of the low stockline charge level of the blast furnace;
the environment-friendly improved blast furnace smelting comprises the following steps:
s1, preparing hot-pressed coal, zinc-containing dust briquettes and mixed injection materials consisting of coal powder and dust of an iron and steel plant respectively as raw materials for smelting by the environment-friendly improved blast furnace;
s2, performing blast furnace smelting on the raw materials in the step S1 by adopting the low stockline operation of the environment-friendly improved blast furnace; introducing furnace top gas generated by blast furnace smelting into a dust removal system for dust removal to obtain dust removal ash and furnace top circulating gas;
blowing normal-temperature oxygen from the oxygen burner in the smelting process to burn and release heat, and decomposing tar generated by carbonization of the hot-pressed briquette;
s3, returning the furnace top circulating coal gas obtained in the step S2 from the material injection burner to the blast furnace for circulating combustion;
s4, when the mass content of the valuable elements in the fly ash obtained in the step S2 is lower than 10%, blowing the valuable elements back into the blast furnace from a tuyere of the environment-friendly improved blast furnace; and when the mass content of the valuable elements is more than or equal to 10%, enriching and recovering the valuable elements in the dedusting ash.
2. The method for treating zinc-containing solid waste of steel and iron plants by using the environmentally-friendly improved blast furnace as claimed in claim 1, wherein in step S1, the hot pressed briquette comprises weakly caking coal, coal tar pitch and biomass binder; the zinc-containing dust pressing block comprises zinc-containing solid waste dust, waste magnesia carbon bricks and bentonite in a steel plant; the mixed injection material consisting of the coal powder and the dust of the iron and steel plant comprises blast furnace injection coal powder and high-carbon and/or high-calcium dust of the iron and steel plant.
3. The method for treating zinc-containing solid waste of steel plants by using the environment-friendly improved blast furnace as claimed in claim 2, wherein the preparation method of the hot-pressed briquette comprises the following steps: respectively crushing the weak bond coal and the coal tar pitch to be less than 3mm and 1mm, and then mixing the materials in percentage by mass (65-75%): (15-25%): (5% -15%) of weak caking coal, coal tar pitch and biomass binder, and preparing the hot-pressed briquette with the particle size of 40-50 mm in a high-pressure roller pair at 230-260 ℃.
4. The method for treating zinc-containing solid waste of steel plants by using the environment-friendly improved blast furnace as claimed in claim 2, wherein the preparation method of the zinc-containing dust briquette comprises the following steps: crushing the zinc-containing solid waste dust of the steel plant to below 1mm, and then mixing the materials in a mass ratio of (75-85%): (5-15%): (5% -15%) of the zinc-containing solid waste dust in the iron and steel plant, the waste magnesia carbon bricks and the bentonite are mixed and then are prepared into zinc-containing dust briquettes with the particle size of 20-30 mm in a high-pressure roller pair.
5. The method for treating the zinc-containing solid waste of the steel plant by the environment-friendly improved blast furnace according to claim 2, wherein the mass content of the high-carbon and/or high-calcium dust of the steel plant in the mixed injection material consisting of the coal powder and the dust of the steel plant is 5-15%; the content of the mixed injection material consisting of the coal powder and the dust of the steel plant is more than or equal to 70 percent, wherein the grain size of the mixed injection material is less than 0.074 mm.
6. The method for treating zinc-containing solid waste of steel plant by using environment-friendly modified blast furnace as claimed in claim 1, wherein the volume of the environment-friendly modified blast furnace is 500m3～1000m3(ii) a The number of the oxygen burners is 12; the number of the material blowing burners is 4.
7. The method for treating zinc-containing solid waste of steel and iron plants through the environmentally-friendly improved blast furnace according to claim 1, wherein in step S2, the dust removal system comprises a gravity dust remover and a bag-type dust remover.
8. The method for treating the zinc-containing solid waste in the steel plant by the environment-friendly improved blast furnace according to claim 7, wherein the top gas is cooled by adding cold flue gas, and then is sent to the gravity dust collector and the bag-type dust collector for dust collection to obtain the dust collection ash and the top circulating gas.
9. The method for treating zinc-containing solid waste of steel and iron plants by using an environmentally-friendly improved blast furnace according to any one of claims 1 to 8, wherein in step S4, valuable elements in the fly ash are recovered by enrichment by using a wet purification process.
10. The method for treating zinc-containing solid waste of steel plants by using the environment-friendly improved blast furnace as claimed in claim 9, wherein the valuable elements comprise zinc and lead.
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| GB508606A (en) * | 1937-11-29 | 1939-07-04 | Huettenwerke Siegerland Ag | Method of smelting zinc containing material in shaft furnaces |
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| CN101555532A (en) * | 2009-05-22 | 2009-10-14 | 北京科技大学 | Oxygen blast furnace iron-making method based on cold-bonded carbonic pellet |
| CN101709341A (en) * | 2009-11-27 | 2010-05-19 | 北京科技大学 | Method for treating iron-containing waste materials in iron and steel plant |
| CN103740939B (en) * | 2013-12-27 | 2015-09-16 | 中冶京诚工程技术有限公司 | A kind ofly utilize Steel Plant Zinc-Bearing Wastes to produce molten iron and reclaim the method for zinc |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB508606A (en) * | 1937-11-29 | 1939-07-04 | Huettenwerke Siegerland Ag | Method of smelting zinc containing material in shaft furnaces |
| CN1632136A (en) * | 2004-12-28 | 2005-06-29 | 辽宁奇欣环保工程技术有限公司 | Method for reclaiming and reusing iron-making dust in blast furnace |
| CN101555532A (en) * | 2009-05-22 | 2009-10-14 | 北京科技大学 | Oxygen blast furnace iron-making method based on cold-bonded carbonic pellet |
| CN101709341A (en) * | 2009-11-27 | 2010-05-19 | 北京科技大学 | Method for treating iron-containing waste materials in iron and steel plant |
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