CN109371184B - Method for treating silicomanganese smelting fly ash by adopting condensation forming process - Google Patents
Method for treating silicomanganese smelting fly ash by adopting condensation forming process Download PDFInfo
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- CN109371184B CN109371184B CN201811271954.0A CN201811271954A CN109371184B CN 109371184 B CN109371184 B CN 109371184B CN 201811271954 A CN201811271954 A CN 201811271954A CN 109371184 B CN109371184 B CN 109371184B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a method for treating silicomanganese smelting dedusting ash by adopting a condensation forming process, belonging to a silicomanganese smelting process in a hot furnace. According to the invention, the silicomanganese dedusting ash and the semi-coke powder are mixed, the submerged arc furnace circulating wastewater is used for soaking, airing and condensing the mixture into a cold clot, the soaking, airing and agglomeration are screened into the furnace, the compressive strength is above 700N, the explosion is avoided at 1100 ℃, the powder content after screening is less than 20%, the furnace entering requirement of the submerged arc furnace is met, therefore, the cold clot can be fed into the furnace to replace part of coke, the coke consumption is reduced, the ferro-manganese ratio of the silicomanganese dedusting ash is about 12 times, the proportion of low-price iron ore can be increased after the blending, the production cost can also be reduced, the recycling of the silicomanganese dedusting ash after simple agglomeration is realized, and the utilization rate of the silicomanganese dedusting ash can be improved without sintering and pelletizing process conditions.
Description
Technical Field
The invention belongs to a smelting process of a silicomanganese ore heating furnace, and particularly relates to a method for treating silicomanganese smelting fly ash by adopting a condensation forming process.
Background
The content of manganese in the silicon-manganese dust is about 18 percent, and the dust is treated by sintering and pelletizing processes in the prior art. Under the condition that no sintering and pelletizing production line exists, ferroalloy enterprises directly mix raw materials into a furnace, most of the raw materials are removed by dust, and the amount of dust removal ash is greatly increased.
Disclosure of Invention
The invention aims to provide a method for treating silicomanganese smelting fly ash by adopting a condensation forming process, which aims to solve the problems of low utilization rate and waste accumulation of the silicomanganese fly ash in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for treating silicomanganese smelting fly ash by adopting a condensation forming process comprises the following steps:
step one, mixing materials:
mixing silicon-manganese dust with semi-coke powder, wherein the silicon-manganese dust accounts for 85-90%, and the semi-coke powder accounts for 10-15%; the content of manganese element in the silicomanganese fly ash is 14-18%, the carbon amount required for reducing 100kg fly ash is 10-15kg according to theoretical calculation, the part of manganese element can be fully contacted and reduced after a condensation block is fed into a furnace, and the yield of the manganese element in the manganese fly ash is improved to be more than 85%; in addition, after the blue carbon powder is added, the strength of cold coagulation blocks is increased in a preheating layer in a silicomanganese ore hot furnace, the air permeability of a charge level is improved, and simultaneously, blue carbon undersize of a ferrosilicon production line can be digested;
step two, soaking treatment:
soaking the mixed material obtained in the step one for 24-30 h; the viscosity of the silicon-manganese dust is between 0.8 and 3Pa.s, the oiliness is high, the bonding strength is poor in short-time soaking, the silicon-manganese dust can be completely soaked when being soaked for 24 to 30 hours, and the compressive strength is about 1168N after airing, so that the requirement of the submerged arc furnace on the furnace entering quality is met;
step three, airing and drying:
spreading and airing the mixed material soaked in the step two until the water content is less than 10%, and collecting cold coagulation blocks;
step four, screening and charging:
and (4) screening the condensation block obtained in the third step until the powder content is less than 26%, and feeding the condensation block into a furnace for use. The silicomanganese dedusting ash cold-coagulation blocks are directly subjected to back mixing, so that the air permeability is poor, screening is needed during feeding, the powder feeding rate of the silicomanganese dedusting ash cold-coagulation blocks is reduced and controlled within 20%, meanwhile, the air permeability of a material layer is improved by properly increasing manganese ores with good particle sizes, and the comprehensive powder feeding rate is controlled within 18%.
In the second step, the materials are soaked by adopting submerged arc furnace to circulate wastewater; the circulating water of the submerged arc furnace is used for soaking the silicomanganese dedusting ash, so that the sewage discharge amount of the circulating water of the submerged arc furnace is reduced, the viscosity of the dedusting ash in the forming process is increased, and the use strength is improved.
The thickness of the material in the third step is 100-150 mm.
And in the fourth step, the condensation block is screened by a vibrating screen with 15-20mm mesh.
In the fourth step, the cold coagulation block accounts for 5-8% of the total amount of the furnace charge. The proportion of cold-coagulation blocks entering the furnace is controlled, and the comprehensive ingredients entering the furnace meet the smelting requirement through the matching and adjustment of ore species, so that the rapid cyclic utilization of the silicomanganese fly ash is realized.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the silicomanganese dedusting ash and the semi-coke powder are mixed, the submerged arc furnace circulating wastewater is used for soaking, airing and condensing the mixture into a cold clot, the soaking, airing and agglomeration are screened into the furnace, the compressive strength is above 700N, the explosion is avoided at 1100 ℃, the powder content after screening is less than 20%, the furnace entering requirement of the submerged arc furnace is met, therefore, the cold clot can be fed into the furnace to replace part of coke, the coke consumption is reduced, the ferro-manganese ratio of the silicomanganese dedusting ash is about 12 times, the proportion of low-price iron ore can be increased after the blending, the production cost can also be reduced, the recycling of the silicomanganese dedusting ash after simple agglomeration is realized, and the utilization rate of the silicomanganese dedusting ash can be improved without sintering and pelletizing process conditions.
Detailed Description
The present invention will be further described with reference to the following embodiments.
A method for treating silicomanganese smelting fly ash by adopting a condensation forming process comprises the following steps:
step one, mixing materials:
mixing silicon-manganese dust with semi-coke powder, wherein the silicon-manganese dust accounts for 85-90%, and the semi-coke powder accounts for 10-15%;
step two, soaking treatment:
soaking the mixed material obtained in the step one in circulating wastewater of an ore furnace for 24-30 h;
step three, airing and drying:
spreading the mixed material soaked in the step two to a thickness of 100-;
step four, screening and charging:
and (4) screening the condensation block obtained in the third step by using a vibrating screen with a screen hole of 15-20mm until the powder content is less than 20%.
Step five, matching manganese series materials:
and (3) matching and adjusting ore species and controlling the proportion of cold-coagulated blocks entering the furnace, so as to ensure that the cold-coagulated blocks occupy 5-8% of the total amount of the materials entering the furnace for use.
Example 1:
step one, mixing materials:
mixing 10t of silicon-manganese dust removal ash and 1.1t of semi-coke powder;
step two, soaking treatment:
soaking the mixed material obtained in the step one in circulating wastewater of a submerged arc furnace for 24 hours, and detecting that the compressive strength is 996N;
step three, airing and drying:
spreading the mixed material soaked in the step two to a thickness of 100mm, airing until the water content is less than 10%, and collecting cold coagulation blocks;
step four, screening and charging:
screening the condensation block obtained in the third step by using a vibrating screen with a screen hole of 15mm, sampling and determining that the proportion of the particle size of less than 5mm is 26%, and basically meeting the quality requirement of charging;
step five, matching manganese series materials:
and (3) matching and adjusting ore species and controlling the proportion of cold-coagulated blocks entering the furnace, so that the cold-coagulated blocks account for 5% of the total amount of the materials entering the furnace and are used in the furnace, the load of sulfur entering the furnace reaches about 0.68%, the load standard of sulfur entering the furnace is within 0.8%, and the load requirement of sulfur entering the furnace is met.
Example 2:
step one, mixing materials:
mixing 10t of silicon-manganese dust and 1.36t of semi-coke powder;
step two, soaking treatment:
soaking the mixed material obtained in the step one in circulating wastewater of a submerged arc furnace for 28 hours, and detecting the compressive strength to be 1190N;
step three, airing and drying:
spreading the mixed material soaked in the step two to a thickness of 150mm, airing until the water content is less than 10%, and collecting cold coagulation blocks;
step four, screening and charging:
screening the condensation block obtained in the third step by using a high-efficiency vibrating screen with 18mm mesh, sampling and determining that the proportion of the granularity smaller than 5mm is 22%, and meeting the requirement of the granularity of charging;
step five, matching manganese series materials:
and (3) matching and adjusting ore species and controlling the proportion of cold-coagulated blocks entering the furnace, so that the cold-coagulated blocks account for 7% of the total amount of the materials entering the furnace and are used in the furnace, the load of sulfur entering the furnace reaches about 0.7%, the load standard of sulfur entering the furnace is within 0.8%, and the load requirement of sulfur entering the furnace is met.
Example 3:
step one, mixing materials:
mixing 10t of silicomanganese dust removal ash and 1.76t of semi-coke powder;
step two, soaking treatment:
soaking the mixed material obtained in the step one in circulating wastewater of a submerged arc furnace for 30h, and detecting the compressive strength to be 1158N;
step three, airing and drying:
spreading the mixed material soaked in the step two to a thickness of 120mm, airing until the water content is less than 10%, and collecting cold coagulation blocks;
step four, screening and charging:
screening the condensation block obtained in the third step by using a vibrating screen with a screen hole of 20mm, sampling and determining that the proportion of the granularity smaller than 5mm is 18%, and meeting the requirement of the granularity of the manganese series material in the furnace;
step five, matching manganese series materials:
and (3) matching and adjusting ore species and controlling the proportion of cold-coagulated blocks in the furnace to ensure that the cold-coagulated blocks account for 8 percent of the total amount of the materials in the furnace to be used in the furnace, the load of sulfur in the furnace reaches about 0.73 percent, and the load standard of the sulfur in the furnace is within 0.8 percent, thereby meeting the load requirement of the sulfur in the furnace.
Claims (5)
1. A method for treating silicomanganese smelting fly ash by adopting a condensation forming process is characterized by comprising the following steps:
step one, mixing materials:
mixing silicon-manganese dust with semi-coke powder, wherein the silicon-manganese dust accounts for 85-90%, and the semi-coke powder accounts for 10-15%;
step two, soaking treatment:
soaking the mixed material obtained in the step one for 24-30 h;
step three, airing and drying:
spreading and airing the mixed material soaked in the step two until the water content is less than 10%, and collecting cold coagulation blocks;
step four, screening and charging:
and (4) screening the condensation block obtained in the third step until the powder content is less than 26%, and feeding the condensation block into a furnace for use.
2. The method for treating silicomanganese smelting fly ash by adopting condensation forming process according to claim 1, characterized by comprising the following steps: and in the second step, the material is soaked by adopting an ore furnace to circulate wastewater.
3. The method for treating silicomanganese smelting fly ash by adopting condensation forming process according to claim 1 or 2, characterized by comprising the following steps: the thickness of the material in the third step is 100-150 mm.
4. The method for treating silicomanganese smelting fly ash by adopting condensation forming process according to claim 3, characterized by comprising the following steps: and in the fourth step, the condensation block is screened by a vibrating screen with 15-20mm mesh.
5. The method for treating silicomanganese smelting fly ash by adopting condensation forming process according to claim 3, characterized by comprising the following steps: in the fourth step, the cold coagulation block accounts for 5-8% of the total amount of the furnace charge.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5256186A (en) * | 1990-10-12 | 1993-10-26 | Mount Isa Mines Limited | Method for the treatment of dusts and concentrates |
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| CN101775487A (en) * | 2010-03-11 | 2010-07-14 | 岳宪忠 | Production method of block material for ironmaking by using ferroalloy mineral powder |
| CN102268541A (en) * | 2011-08-08 | 2011-12-07 | 无锡雪浪环境科技股份有限公司 | Cold-pressed pellets for smelting ferromanganese and preparation method for cold-pressed pellets |
| CN102978387A (en) * | 2012-11-22 | 2013-03-20 | 北京科大国泰能源环境工程技术有限公司 | Process for producing cold-bonded pellet by using fly ash in steel solid waste |
| CN103614562B (en) * | 2013-12-06 | 2015-08-26 | 北京科技大学 | A kind of melting furnace process Steel Plant solid waste processing method |
| CN104099467B (en) * | 2014-07-22 | 2016-03-30 | 甘肃山丹腾达西铁冶金有限责任公司 | Manganese-silicon metallurgy industry flue dust is utilized to regenerate the technique of curing molding manganese ore block |
| CN104109755B (en) * | 2014-07-30 | 2016-04-20 | 中冶南方工程技术有限公司 | A kind of dedusting ash is colded pressing metal pelletizing production system and method |
| CN108118111A (en) * | 2017-12-21 | 2018-06-05 | 贵州大学 | The technique that a kind of silicomangan dedusting ash prepares composite slag agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5256186A (en) * | 1990-10-12 | 1993-10-26 | Mount Isa Mines Limited | Method for the treatment of dusts and concentrates |
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