CN115679097A - Method for recycling iron-making gas ash by using converter slag and refined dedusting ash - Google Patents
Method for recycling iron-making gas ash by using converter slag and refined dedusting ash Download PDFInfo
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- CN115679097A CN115679097A CN202211449774.3A CN202211449774A CN115679097A CN 115679097 A CN115679097 A CN 115679097A CN 202211449774 A CN202211449774 A CN 202211449774A CN 115679097 A CN115679097 A CN 115679097A
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- 238000000034 method Methods 0.000 title claims abstract description 48
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- 239000000463 material Substances 0.000 claims abstract description 14
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000503 Na-aluminosilicate Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
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- 239000011398 Portland cement Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
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- 239000000429 sodium aluminium silicate Substances 0.000 description 1
- 235000012217 sodium aluminium silicate Nutrition 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 150000003388 sodium compounds Chemical class 0.000 description 1
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- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
Abstract
The invention discloses a method for recycling ironmaking gas ash by using converter slag and refined fly ash, purchasing zeolite particles with the particle size of 1-3 mm and pulling the zeolite particles to a dry powder pelletizing production line for standby; uniformly mixing refined dust removal ash, zeolite particles and ironmaking gas ash according to the mass percentage of 40; when the converter discharges slag, the pellets are added into a slag pot according to 100-250 kg of slag per ton along with slag flow, or the pellets are added into the slag pot after the slag pot is filled with liquid steel slag of the converter; and (3) standing the slag tank for 120min, treating the mixture in the slag tank according to a hot splashing slag or hot smoldering slag process, and performing crushing → screening → magnetic separation on a production line for screening and magnetically separating to recover heavy metal and iron-containing materials, returning the heavy metal and iron-containing materials to a metallurgical enterprise for resource utilization, and recycling tailings as building materials or cement production materials.
Description
Technical Field
The invention relates to two aspects of process contents of recycling utilization technology of ironmaking gas ash and LF refining furnace dust and converter steel slag performance optimization, in particular to a method for recycling ironmaking gas ash by using converter slag and refined dust.
Background
In the LF smelting process, the superfine particles in part of the metallurgical raw materials are sucked to an ash bin of a dust removal system by the dust removal system and become the main part of the dust removed by the refining furnace; in addition, in the LF smelting process, partial raw and auxiliary materials in an arc region and metal materials are vaporized under the action of high temperature (3000-6000 ℃) in the arc region, a series of chemical reactions occur in the vaporization process, and chemical reaction products enter a dust removal system pipeline and then are rapidly cooled and also enter an ash bin of a dust removal system to become part of dust removal. The composition range W [ ]% of the refined fly ash of a certain plant is shown in the following table:
the application and research of the dust removal ash of the refining furnace are less. According to the invention, the particle size distribution characteristics and the component characteristics of the refining furnace dust are researched, the metallurgical transmission theory is combined, the new process of applying the refining furnace dust to steel making is conceived, the refining furnace dust is directly used as a calcareous deoxidizer in the new process of steel making, the requirement of steel making on the calcareous deoxidizer is met, the harmful factors of toxic substances generated in the dust humidifying process are eliminated, and the steel making cost is reduced and the environmental protection is obviously realized. "is expressed in terms of content; (2) The Shangjun published a paper entitled "poisoning mechanism and resource utilization process of LF refining furnace fly ash" in journal of Industrial heating 6 th year in 2013, and there is a paper "according to technical analysis, formation mechanism of poisoning substances in LF refining furnace fly ash is analyzed, starting from the steel-making link, a non-humidifying process is adopted, and the LF refining furnace fly ash is successfully applied between the steel-tapping deoxidation link and the KR desulfurization process of electric arc furnace steel-making. "is expressed in terms of content;
in the above documents, there is no mention of a process for treating ironmaking gas ash by using the fly ash of a refining furnace in cooperation with converter steel slag.
The blast furnace gas mud is a product obtained by wet dedusting of raw material dust carried along with blast furnace gas and particles generated by violent reaction in a high-temperature area in the blast furnace smelting process. Blast furnace gas ash, which is a by-product of the steel industry, contains iron and carbon as main components, and has an iron content of about 30% and a carbon content of about 20%. Meanwhile, as part of iron ores used by the blast furnace contain a certain amount of nonferrous metals, the nonferrous metals with low boiling point volatilize in the blast furnace and then enter the blast furnace gas, and are finally enriched in gas mud in the form of oxides. Eight iron and Steel Limited 2500m in Xinjiang 3 The blast furnace gas ash composition of (a) is given in the following table:
the resource utilization process of blast furnace gas ash is a rotary hearth furnace and shaft furnace process, and after zinc, lead, potassium and sodium are removed from the gas ash, the residual iron-containing pellets return to the iron-making process for resource utilization. In addition, no effective process method for effectively treating the blast furnace gas ash in full quantity exists at present.
In reference to the document (1), the journal of mining industry promulgated in Liu's country, penjinhui, zhangbo et al, 5 th of 2007, published a paper entitled "research status on recycling of blast furnace gas mud (ash)", in 1976, the United states Environmental Protection Agency (EPA) formulated laws, and dust from steel and iron plants containing lead and zinc is classified into K061 substances (toxic solid wastes) which are required to be recovered or passivated, otherwise, the dust needs to be hermetically stacked in a designated place. "is expressed in terms of content; (2) A paper entitled "research on mixed injection of blast furnace gas ash and pulverized coal" was published in journal of "chinese metallurgy" of 5 th stage of 2007 by jamaici, zhangpropylhua, and there is a paper "blast furnace gas ash is one of byproducts generated in a blast furnace smelting process, and contains a large amount of beneficial iron and carbon. At present, some foreign iron and steel enterprises adopt a landfill mode to treat the iron and steel, and basically adopt a treatment mode of returning to sintering and agglomeration again at home. The technology of mixing the coal ash with the pulverized coal and then spraying the mixture into the blast furnace from a tuyere is a very potential development technology by utilizing the blast furnace gas ash. The mixed blowing can not only effectively utilize useful substances in the ash, but also achieve the aims of reducing the coke ratio, improving the yield and facilitating the stable and smooth operation of the furnace condition.
According to the above description, there is no technical method for treating ironmaking gas ash by using converter slag and refined fly ash.
The converter steelmaking is a technological process of blowing high-speed oxygen into the surface of liquid high-temperature molten iron, oxidizing to remove the elements harmful to smelting steel species in the molten iron, and utilizing the chemical heat of reaction process to heat the molten iron to the tapping temperature suitable for smelting steel species. The liquid converter steel slag produced in the converter steelmaking process has the characteristics of high alkalinity and high f-CaO content in the steel slag. In the review of literature (1), a paper entitled "experimental study on converter slag melt modification" was published in silicate report journal of 2006, 6 th of Zhangiang, courage of Jumbo, and Xuhongjiang, and the existence of free calcium oxide (f-CaO) in high-alkalinity converter slag is a main factor causing expansion of the converter slag, so that the application of the converter slag as a building material is limited. The expansion of the converter slag is measured by adopting an autoclaving method, the influence of the granularity and the aging time on the expansion of the converter slag is examined, the blast furnace slag is added into the converter slag in a molten state, the structure of a product after the molten reaction is analyzed, the change of the volume expansion rate of the converter slag after the molten reaction is measured and analyzed by adopting the autoclaving method, and an experimental result shows that the volume expansion rate can be obviously reduced by adding the blast furnace slag into the converter slag in the molten state, so that a basis is provided for the application of the converter slag to building materials. "Gong Shi was constructed, tang Jiang Ying, wang Bin published a paper entitled" application study of converter slag in molten iron desilication field "in the 4 th journal of steelmaking in 2005, and the paper includes: the desiliconization experiment of molten iron is carried out by adopting Bao steel converter slag as flux under the conditions of laboratory and industrial mass production, and the result shows that the desiliconization effect of the desiliconization agent produced by using converter slag instead of lime as flux is better. "is expressed in terms of content;
according to the above literature, there is no process for simultaneously treating the fly ash of the refining slag and the blast furnace gas ash with the converter steel slag.
Disclosure of Invention
The invention aims to provide a method for recycling ironmaking gas ash by using converter slag and refined fly ash, which is characterized in that certain active materials are added into ironmaking gas ash and refined fly ash of a refining furnace, then the ironmaking gas ash and the refined fly ash are added into high-temperature thermal-state steel slag, heavy metal elements in the ironmaking gas ash are recovered by using the high-temperature converter steel slag, the risk factor of the refined fly ash is eliminated, and the purpose of treating waste with waste and realizing overall resource utilization is achieved.
The technical scheme adopted for realizing the aim of the invention is that the method for recycling the ironmaking gas ash by using the converter slag and the refined fly ash comprises the following implementation steps:
1) Purchasing 1-3 mm zeolite particles and conveying to a dry powder pelletizing production line for later use;
2) The ironmaking gas ash and the refined dust removal ash are transported to a pelletizing production line for standby;
3) Uniformly mixing the refined dust removal ash, the zeolite particles and the ironmaking gas ash according to the mass percentage of 40;
4) When slag is discharged from the converter, the pellets are added into a slag pot according to the amount of 100-250 kg of slag per ton, or the pellets are added into the slag pot after the slag pot is filled with liquid steel slag of the converter; wherein: the temperature of the converter slag is more than 1580 ℃, 200-250 kg of the pellets are added into each ton of slag; the temperature of the converter slag is lower than 1580 ℃, 100-200 kg of the pellets are added into each ton of slag;
5) And standing the slag tank for 120min, treating the mixture in the slag tank according to a hot splashing slag or hot smoldering slag process, and performing crushing → screening → magnetic separation on a production line for screening and recovering heavy metals and iron-containing materials in a magnetic separation manner, returning the heavy metals and iron-containing materials to a metallurgical enterprise for resource utilization, and recycling tailings as building materials or cement production materials.
The technical principle of the invention is based on steel slag thermal coupling technology and metallurgy transmission theory. The technological concept of "steel slag-based thermal coupling technology", namely, the heat contained in the "high-temperature steel slag, can influence the chemical properties and physical properties of the steel slag. On the contrary, the chemical property of the steel slag can be changed, and the temperature of the steel slag in the system can be influenced, namely the property and the temperature of the steel slag are influenced mutually. Under a certain temperature condition, the value mining and utilization of chemical components of the steel slag and the utilization of heat energy are realized by changing the physical properties and the chemical properties of the steel slag, which is called as steel slag thermal coupling technology. The concept is put forward for the first time by the inventor and professor schooled by Bao Steel research institute ShouYongli. The innovation points of the invention are as follows:
1. the inventor finds that the liquid converter steel slag contains a part of dispersed iron liquid drops or small iron beads, and the iron liquid drops or the small iron beads contain elements such as [ C ], [ Si ], [ P ] and the like and are reductive substances with strong reducibility at high temperature;
2. the converter liquid steel slag has a special alkaline mineral structure and contains a large amount of physical heat, and the converter steel slag has low heat conductivity coefficient, so that a slag tank filled with the liquid converter steel slag is a reaction container for carrying out an ideal metallurgical physical and chemical reaction.
3. The refined fly ash contains more potassium and sodium components and a plurality of reducing substances, the granularity is about 200 meshes, and the refined fly ash has stronger reactivity, and the potassium and sodium compounds have stronger reactivity in liquid steel slag;
4. the mineral tissues of potassium and sodium in the tailings can promote the hydration reaction, thus being beneficial to the resource utilization of the steel slag as building sand and road building materials and the harmless transformation of heavy metal compounds;
5. the blast furnace gas ash contains elements such as iron, zinc, lead, potassium, sodium, carbon and the like, and can generate self-reducing reaction in the solidification process of liquid converter steel slag and steel slag, so that heavy metal substances are promoted to be reduced into metal, potassium and sodium are converted into low-melting-point substances, and resource utilization of different components and harmless conversion of harmful substances are realized.
According to the above findings, the inventors carried out the following process for treating blast furnace gas ash by using converter steel slag and refined fly ash in combination: uniformly mixing refined fly ash, zeolite particles and converter gas ash according to the mass percentage of 40; in the converter slag discharging process, adding the pellets into a slag pot according to 100-250 kg of slag per ton along with slag flow, or adding the pellets into the slag pot after the slag pot is filled with converter liquid steel slag; standing the slag tank for 120min, treating the mixture in the slag tank according to a hot slag splashing or hot slag smoldering process, performing magnetic separation on the treated mixture in a crushing → screening → magnetic separation production line to recover heavy metals and iron-containing materials, returning the heavy metals and iron-containing materials to a metallurgical enterprise for resource utilization, and using tailings as building materials or cement production materials for resource utilization;
the innovation points of the invention are as follows:
1. reducing heavy metal compounds in the ironmaking gas ash and iron and manganese elements in converter steel slag by using reducing substances of refined fly ash and carbon elements in the ironmaking gas ash, and recovering the iron and zinc-lead elements in the ironmaking gas ash and the converter steel slag, wherein CO bubbles generated by the reaction can promote the breakage of pellets, stir the converter steel slag and provide dynamic conditions for the thermal coupling reaction of the steel slag;
2. by usingThe dispersed small liquid iron beads in the liquid steel slag are fused with the small zinc-lead drops reduced into liquid metal to grow up, and simultaneously [ C ] in the molten iron]、[Si]、[P]Can interact with (0) in the environment 2- ) Reacting to prevent secondary oxidation of zinc and lead and achieve the purpose of recovering zinc and lead in the ironmaking gas ash;
3. the inventor takes zeolite particles as aggregate, makes the ironmaking gas ash and the refined dust removal ash into balls, utilizes the characteristic that the zeolite contains sodium aluminosilicate minerals to digest f-CaO in the converter steel slag, improves the safety of resource utilization of the converter steel slag, simultaneously reduces the temperature of the furnace slag in a reaction area by the endothermic effect of the decomposition reaction, weakens the reaction of gasifying and escaping the furnace slag after zinc and lead are reduced, and seals the reduced zinc and lead heavy metals in the converter steel slag;
4. the method has the advantages that potassium-sodium compounds in zeolite, ironmaking gas ash and dust removed from a refining furnace are utilized to adjust the fluidity of converter slag, improve the sulfur capacity and the phosphorus capacity of the converter slag, form various low-melting-point compounds, create conditions for crushing, screening and magnetic separation of heavy metals in subsequent slag treatment, improve the hydration reaction speed in the process of recycling converter tailings and improve the recycling performance of the tailings;
5. the converter slag is utilized to react with the refined fly ash, the zeolite and the ironmaking gas ash, so that the purpose of digesting harmful substances such as calcium phosphide, calcium carbide, calcium sulfide and the like in the refined fly ash is achieved, and the harmless transformation of the harmful substances is realized;
6. no zinc-lead compound participating in the reaction exists in the converter steel slag, and because the converter steel slag is the over-burnt portland cement clinker, the hydration reaction of resource utilization forms a hydration reaction product, thereby achieving the technical purpose of ore formation and sealing storage of harmful substances.
The method fully utilizes the heat energy and potential valuable components of the converter steel slag, utilizes the ironmaking gas ash and the refining furnace fly ash in a synergistic and resource manner, treats waste by waste, and realizes the purpose of maximum utilization of potential values of three solid wastes; the current resource utilization process of ironmaking gas ash is a rotary hearth furnace and shaft furnace process. The process has the advantages of long process flow, large occupied area, large investment and long construction period, is not suitable for urban steel mills and compact steel mills, can completely solve the problem of ironmaking gas ash by using the technology, and has great positive significance and obvious environmental protection benefit. By using the invention, the amount of iron elements recovered from the converter slag by magnetic separation can be increased, and the high-efficiency recovery and utilization of the iron elements in the ironmaking gas ash can be realized.
Detailed Description
The process of the invention is illustrated by a converter line for Yili steel. The production line is configured to: the process flow of converter, LF molten steel refining and CCM continuous casting comprises the steps of 120kg of converter slag per ton of steel, 30kg of refined fly ash per ton of steel and 20kg of blast furnace gas ash per ton of steel.
A method for recycling ironmaking gas ash by using converter slag and refined fly ash comprises the following steps:
1) Purchasing zeolite particles with the diameter of 1-3 mm and carrying the zeolite particles to a dry powder pelletizing production line for later use;
2) The ironmaking gas ash and the refined dust removal ash are transported to a pelletizing production line for standby;
3) Uniformly mixing the refined fly ash, the zeolite particles and the ironmaking gas ash according to the mass percentage of 40;
4) When slag is discharged from the converter, the pellets are added into a slag pot according to 100-250 kg of slag per ton along with slag flow, or the pellets are added into the slag pot after the slag pot is filled with liquid steel slag of the converter; wherein: the temperature of the converter slag is more than 1580 ℃, and 200-250 kg of the pellets are added into each ton of slag; the temperature of the converter slag is lower than 1580 ℃, and 100-200 kg of the pellets are added into each ton of slag;
5) After the slag tank is kept still for 120min, the mixture in the slag tank is treated according to a hot splashing slag or hot stuffy slag process, heavy metal and iron-containing materials are recovered through magnetic separation after the treatment in a crushing → screening → magnetic separation production line, the heavy metal and iron-containing materials are returned to a metallurgical enterprise to be used as raw materials for resource utilization, and tailings are used as building materials or cement production raw materials for resource utilization.
Claims (1)
1. A method for recycling ironmaking gas ash by using converter slag and refined fly ash is characterized by comprising the following steps:
1) Purchasing 1-3 mm zeolite particles and conveying to a dry powder pelletizing production line for later use;
2) The ironmaking gas ash and the refined dust removal ash are transported to a pelletizing production line for standby;
3) Uniformly mixing the refined dust removal ash, the zeolite particles and the ironmaking gas ash according to the mass percentage of 40;
4) When slag is discharged from the converter, the pellets are added into a slag pot according to 100-250 kg of slag per ton along with slag flow, or the pellets are added into the slag pot after the slag pot is filled with liquid steel slag of the converter; wherein: the temperature of the converter slag is more than 1580 ℃, 200-250 kg of the pellets are added into each ton of slag; the temperature of the converter slag is lower than 1580 ℃, 100-200 kg of the pellets are added into each ton of slag;
5) After the slag tank is kept still for 120min, the mixture in the slag tank is treated according to a hot splashing slag or hot stuffy slag process, heavy metal and iron-containing materials are recovered through magnetic separation after the treatment in a crushing → screening → magnetic separation production line, the heavy metal and iron-containing materials are returned to a metallurgical enterprise to be used as raw materials for resource utilization, and tailings are used as building materials or cement production raw materials for resource utilization.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116174456A (en) * | 2023-03-13 | 2023-05-30 | 新源县渣宝环保技术有限公司 | Method for cooperatively treating fly ash in Yili region by utilizing Yili converter slag |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105695735A (en) * | 2015-11-26 | 2016-06-22 | 新疆八钢铁股份有限公司 | Self-reduction utilization process for steel rolling oily sludge and blast furnace gas dust |
| CN108130422A (en) * | 2017-12-11 | 2018-06-08 | 西安建筑科技大学 | A kind of method that valuable metal is extracted in steel plant's flue dust |
| CN109136563A (en) * | 2018-08-01 | 2019-01-04 | 刘金昌 | A kind of method that smelting iron and steel scrap loop recycles |
| CN109536729A (en) * | 2018-10-29 | 2019-03-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of utilization method for the dedusting ash that smelting iron and steel generates |
| CN110669921A (en) * | 2019-10-18 | 2020-01-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | System and method for resourcefully treating steelmaking secondary dedusting ash |
| CN110878385A (en) * | 2020-01-07 | 2020-03-13 | 王强 | Method for producing molten steel precipitation deoxidizer by using electrolytic aluminum carbon slag |
| CN112125540A (en) * | 2020-09-27 | 2020-12-25 | 武汉钢铁有限公司 | Method for recycling blast furnace gas mud by using slag stewing process |
| CN112342375A (en) * | 2020-10-28 | 2021-02-09 | 湖南华菱湘潭钢铁有限公司 | Method for recovering iron in metallurgical dust and mud |
| CN113604660A (en) * | 2021-06-21 | 2021-11-05 | 酒泉钢铁(集团)有限责任公司 | Dedusting ash micronized recycling process method |
-
2022
- 2022-11-19 CN CN202211449774.3A patent/CN115679097B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105695735A (en) * | 2015-11-26 | 2016-06-22 | 新疆八钢铁股份有限公司 | Self-reduction utilization process for steel rolling oily sludge and blast furnace gas dust |
| CN108130422A (en) * | 2017-12-11 | 2018-06-08 | 西安建筑科技大学 | A kind of method that valuable metal is extracted in steel plant's flue dust |
| CN109136563A (en) * | 2018-08-01 | 2019-01-04 | 刘金昌 | A kind of method that smelting iron and steel scrap loop recycles |
| CN109536729A (en) * | 2018-10-29 | 2019-03-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of utilization method for the dedusting ash that smelting iron and steel generates |
| CN110669921A (en) * | 2019-10-18 | 2020-01-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | System and method for resourcefully treating steelmaking secondary dedusting ash |
| CN110878385A (en) * | 2020-01-07 | 2020-03-13 | 王强 | Method for producing molten steel precipitation deoxidizer by using electrolytic aluminum carbon slag |
| CN112125540A (en) * | 2020-09-27 | 2020-12-25 | 武汉钢铁有限公司 | Method for recycling blast furnace gas mud by using slag stewing process |
| CN112342375A (en) * | 2020-10-28 | 2021-02-09 | 湖南华菱湘潭钢铁有限公司 | Method for recovering iron in metallurgical dust and mud |
| CN113604660A (en) * | 2021-06-21 | 2021-11-05 | 酒泉钢铁(集团)有限责任公司 | Dedusting ash micronized recycling process method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116174456A (en) * | 2023-03-13 | 2023-05-30 | 新源县渣宝环保技术有限公司 | Method for cooperatively treating fly ash in Yili region by utilizing Yili converter slag |
| CN116174456B (en) * | 2023-03-13 | 2023-11-24 | 新源县渣宝环保技术有限公司 | Method for cooperatively treating fly ash in Yili region by utilizing Yili converter slag |
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