CN102061345A - Comprehensive treatment method for recycling ferrous metallurgical slag - Google Patents
Comprehensive treatment method for recycling ferrous metallurgical slag Download PDFInfo
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The invention relates to a comprehensive treatment method for recycling ferrous metallurgical slag. The method comprises the steps of treatment of ferrous metallurgical slag, such as steel slag, blast furnace water slag, desulfurization gypsum, sludge, blast furnace slag, coal ash slag, and coal gangue, comprehensive treatment of waste coal gas, such as coke oven gas, blast furnace gas, and converter gas, and recycling of production waste water. In the method, the steel slag is comprehensively utilized, the production steps are the same, and the resources, such as plants, equipment and the like can be shared, and the investment is reduced; the waste coal gas, such as the coke oven gas, the blast furnace gas, and the converter gas, serve as drying fuels to be fully utilized, and the residual part of the waste coal gas is used for combustion and power generation, so that energy consumption is reduced; and production waste water is collected and treated and then is returned to production, so that water is saved. By implementing the method, the ferrous metallurgical slag is effectively treated; and the method has good economic and environmental benefits.
Description
Technical field
The present invention relates to a kind of treatment process of industrial residue, particularly a kind of ferrous metallurgy slag comprehensive treatment method for recycling.
Background technology
Steel industry is the consumption rich and influential family of resource, also is the disposal of pollutants rich and influential family simultaneously.To produce 1000 ten thousand tons of steel production enterprise per year is example, annual 105.32 ten thousand tons in slag, 5.4 ten thousand tons of the dried slags of blast furnace, 2.24 ten thousand tons of coal ash of power plant slags, 0.98 ten thousand ton of coal gangue, about 2.28 ten thousand tons of the dewatered sludge of producing.A large amount of metallurgical slag of steel industry discharging if reasonably do not handled and utilize, will take a large amount of arable lands, environment is made a very bad impression severe patient even threaten the normal operation that enterprise produces.Therefore, carry out research, have crucial meaning reducing enterprise's production cost, environment protection and economizing on resources to metallurgical slag resource utilization pattern.
At present, the research of metallurgical slag resource utilization mainly concentrates on the following aspects: the operating mine slag cement, as metallurgy return raw material, as road and material of construction, production agricultural fertilizer and soil improvement agent etc.Current, metallurgical slag resource utilization approach is more single, and main path is the processing of various slag single resource.The subject matter that exists has: do not form the network of metallurgical slag resource utilization, cause metallurgical slag resource utilization flexibility lower, can not adjust according to the demand in market; The industrial chain of each metallurgical slag resource utilization is shorter, does not continue exploitation downstream high value added product, and economic benefit is low; Do not pay attention to waste coal gas (coke-oven gas, blast furnace gas, coal gas of converter) is used for the production process of reconstituted product, caused the waste of waste coal gas (coke-oven gas, blast furnace gas, coal gas of converter) resource; Do not pay attention to factory effluent is recycled, cause the waste of water resources.
Summary of the invention
The objective of the invention is to the defective that exists in the present steel metallurgical slag treatment process, provide a kind of ferrous metallurgy slag comprehensive treatment method for recycling, to solve the low problem of resource product added value that the processing of current various ferrous metallurgy slag single resource brings.
For achieving the above object, the present invention adopts following technical proposals:
A kind of ferrous metallurgy slag comprehensive treatment method for recycling comprises the ferrous metallurgy slag that produces in the ferrous metallurgy process, the comprehensive utilization and the factory effluent recycling of waste coal gas, it is characterized in that:
A kind of ferrous metallurgy slag comprehensive treatment method for recycling comprises the ferrous metallurgy slag that produces in the ferrous metallurgy process, the comprehensive utilization and the factory effluent recycling of waste coal gas, it is characterized in that:
The concrete steps of the processing of A. described ferrous metallurgy slag are as follows:
A. slag is handled: the bessemer furnace slag that comes out from steelworks carries out magnetic separation, screening is handled after cylinder or hot vexed treatment facility granulation, the higher slag of isolated iron-holder by converter as the steel scrap utilization; The slag that iron content is lower enters the smelting iron and steel flow process as sintered material; Rest part through abrasive dust make slag micro powder or or make aggregate through crushing and screening; The higher slag steel of described iron-holder is the slag of particle diameter 〉=15mm, iron level 〉=85%; The slag that described iron content is lower be particle diameter at particle diameter＜15mm, the slag of 85%＞iron level 〉=80%;
B. Handling Blast Furnace Granulated Slag: blast furnace granulated slag sends into through tramp iron separator, metal locator, pneumatic two-way valve scraper-trough conveyer that vertical mill is dried and grinding is made slag micropowder after storing up dehydration naturally;
C. desulfurated plaster is handled: sintering and means of flue gas desulfurization of power plant gypsum are processed into terra alba through stoving oven;
D. the slag micro powder that step a, b, c are obtained, slag micropowder, terra alba, cement clinker, admixture and water mixing production building block cement, wherein the quality percentage composition of each component is:
Slag micro powder and slag micropowder 78% ~ 85%,
Terra alba 12% ~ 18%,
Cement clinker 5% ~ 8%,
Admixture and water surplus; Described admixture is Wingdale and alkalimetal silicate;
E. dewatered sludge, the dried slag of blast furnace, slag, coal ash slag, coal gangue crushing and screening are made aggregate: dewatered sludge and slag are from the converter steelmaking process by product, the dried slag of blast furnace is from the blast furnace ironmaking process by product, and coal ash slag and coal gangue come from the thermal power generation plant by-products;
F. with steps d gained building block cement, step e gained aggregate, be equipped with flyash and cement again, make building block through batching, stirring, moulding, maintenance;
G. with step a gained aggregate, be equipped with flyash and cement, make the city footway brick through batching, stirring, moulding, maintenance;
B. collect the waste coal gas that produces in the ferrous metallurgy process and be used for baking operation as fuel, part more than needed provides electric power by generating electricity by way of merging two or more grid systems for system;
C. reclaim factory effluent, return water of productive use after treatment again.
The present invention compares with existing ferrous metallurgy slag treatment process, has following conspicuous substantive distinguishing features and advantage: various ferrous metallurgy slag resource utilizations have formed symbiotic relationship, and the resource utilization of the various ferrous metallurgy slags that have been coupled has improved the flexibility of system; Extend industrial chain, produced high value added product building block and city footway brick, improved economic benefit; Building block and city footway brick that the inventive method utilizes various ferrous metallurgy slags to produce can be widely used in building field; Dewatered sludge, the dried slag of blast furnace, slag, coal ash slag, coal gangue crushing and screening have identical production process, can realize sharing of resources such as factory building, equipment, have reduced investment; Make full use of waste coal gas (coke-oven gas, blast furnace gas, coal gas of converter) as drying fuel, part more than needed is generated electricity by way of merging two or more grid systems, and cuts down the consumption of energy; Production, water saving are returned in the factory effluent collection and treatment later on.By the enforcement of this programme, various ferrous metallurgy slags have obtained effective processing, can bring remarkable economic efficiency and environmental benefit for enterprise.
Description of drawings
Fig. 1 is the schema of ferrous metallurgy slag comprehensive treatment method for recycling;
Fig. 2 is the inventive method materials flow chart.
Concrete implementing method
The inventive method is an example to produce 1000 ten thousand tons of steel production enterprise per year, (wherein about 37.2 ten thousand t can be used for production city footway brick and building block to produce 105.32 ten thousand tons in slag every year approximately, all the other return converter and make sintered material), 5.32 ten thousand tons of the dried slags of blast furnace, aggregate chips 5.5 ten thousand t (coal ash of power plant slag 2.24 ten thousand t, coal gangue 0.98 ten thousand t, about 2.28 ten thousand t of dewatered sludge).The required flyash of production city footway brick and building block can be by steel mill's self-sufficiency, and raw materials such as cement clinker, early strong abrasion-aided additive adopt outsourcing.Implementing method is referring to Fig. 1 and Fig. 2.
First: the bessemer furnace slag that comes out from steelworks send the steel of solid waste comprehensive treating process field after cylinder or hot vexed treatment facility granulation
The slag treatment facility carries out processing such as magnetic separation, screening, slag steel (particle diameter 〉=15mm, iron level 〉=85% that isolated iron-holder is higher
) by converter as the steel scrap utilization; The part that iron content is lower (particle diameter＜15mm, 85%＞iron level 〉=80%) send sintering to enter the smelting iron and steel flow process as sintered material; Rest part (particle diameter: 3 ~ 20mm, 20 ~ 50mm iron level＜80%) is through abrasive dust system slag micro powder, or is used for production city footway brick and building block through crushing and screening system aggregate;
Second: blast furnace granulated slag sends into through tramp iron separator, metal locator, pneumatic two-way valve scraper-trough conveyer that vertical mill is dried and grinding after storing up dehydration naturally.The part meal that draws off from grinding machine is via the electric lock air-valve, and chain transfer, chapelet, pneumatic two-way valve scraper-trough conveyer, electromagnetic separator and chain transfer, individual layer Weight type lock wind reprint valve return grinding machine so that further grinding system slag micropowder;
The 3rd: will contain free about 10% desulfurated plaster and be delivered to by transfer roller on the feed skewed slot of stoving oven by charging hopper, feed drops on the red-hot roasting material table top of fluidizing, and when temperature was raised to 140 ℃ of specified table top temperature, free water content was excluded rapidly.30 to 40 minutes of in stoving oven, stopping of feed, desulfurated plaster changes the semihydrate terra alba into basically from dihydrate;
The 4th: with the cement clinker of above-mentioned three slag micro powders that obtain, slag micropowder, gypsum and outsourcings, admixture directly according to one
Fixed ratio adds water mixing production building block cement.Slag micro powder and slag micropowder account for 78% ~ 85%, terra alba 12% ~ 18%, and cement clinker 5% ~ 8%, all the other are admixture (Wingdale and alkalimetal silicate) and water, but concrete reference literature " recycling of ferrous metallurgy slag ";
The 5th: dewatered sludge, the dried slag of blast furnace, slag, coal ash slag, coal gangue crushing and screening are made the aggregate of production city footway brick and building block.Dewatered sludge and slag are from the converter steelmaking process by product, and the dried slag of blast furnace is from the blast furnace ironmaking process by product, and coal ash slag and coal gangue come from the thermal power generation plant by-products;
The 6th: the dried slag of 5.32 ten thousand t blast furnaces behind the 5th step crushing and screening is all consumed, and according to the aggregate proportioning, the slag consumption is 3.99 ten thousand t, aggregate chips (coal ash of power plant slag, coal gangue, dewatered sludge) consumption 3.99 ten thousand t, and the aggregate total amount is 13.3 ten thousand t.Pavior brick, building block, perforated brick, standard brick goods concrete formulation are masonry cement: aggregate=1:4, according to this ratio, need building block cement
3.325 ten thousand t, raw material are totally 16.625 ten thousand t.This part material all is used for the production building block, with building block cement, aggregate, again
Be equipped with flyash and cement, through batching, stirring, moulding, maintenance, the production building block;
The 7th: will remain slag 33.21 ten thousand t and place certain hour to alleviate the influence of free calcium oxide to goods, according to certain ratio, wherein 120,000 t slags are joined 1.5 ten thousand t cement, join 1.5 ten thousand t flyash, through batching, stirring, moulding, maintenance, and the production city
City's footway brick;
The 8th:To remain 1.51 ten thousand t aggregate chips and all consume,, join 2.14 ten thousand t cement, join 1.87 ten thousand t flyash, through batching, stirring, moulding, maintenance production building block according to certain ratio with residue 21.21 ten thousand t slags;
The 9th: collect waste coal gas, be used for baking operation as fuel, part more than needed provides electric power by generating electricity by way of merging two or more grid systems for system.Concrete grammar is with reference to heat ice sister-in-law's " renewable resources of Iron And Steel Industry coal gas " and Gao Yongfen " utilizing the Study on Engineering Design of waste coal gas generating ";
The tenth: reclaim factory effluent, return water of productive use after treatment again.
Economic benefit: to produce 1000 ten thousand tons of steel production enterprise per year is example, (wherein about 37.2 ten thousand t can be used for city footway brick and building block to handle 105.32 ten thousand tons in slag every year approximately, all the other return converter and make sintered material), 5.32 ten thousand tons of the dried slags of blast furnace, aggregate chips 5.5 ten thousand t (coal ash of power plant slag 2.24 ten thousand t, coal gangue 0.98 ten thousand t, about 2.28 ten thousand t of dewatered sludge), can produce high value added product building block 300,000 m
3, city footway brick 1,500,000 m
2Comprehensive utilization waste coal gas and factory effluent reduce enterprise energy consumption.
Claims (1)
1. a ferrous metallurgy slag comprehensive treatment method for recycling comprises the ferrous metallurgy slag that produces in the ferrous metallurgy process, the comprehensive utilization and the factory effluent recycling of waste coal gas, it is characterized in that:
The concrete steps of the processing of the described ferrous metallurgy slag of A are as follows:
A. slag is handled: the bessemer furnace slag that comes out from steelworks carries out magnetic separation, screening is handled after cylinder or hot vexed treatment facility granulation, the higher slag of isolated iron-holder by converter as the steel scrap utilization; The slag that iron content is lower enters the smelting iron and steel flow process as sintered material; Rest part through abrasive dust make slag micro powder or or make aggregate through crushing and screening; The higher slag steel of described iron-holder is the slag of particle diameter 〉=15mm, iron level 〉=85%; The slag that described iron content is lower be particle diameter at particle diameter＜15mm, the slag of 85%＞iron level 〉=80%;
B. Handling Blast Furnace Granulated Slag: blast furnace granulated slag sends into through tramp iron separator, metal locator, pneumatic two-way valve scraper-trough conveyer that vertical mill is dried and grinding is made slag micropowder after storing up dehydration naturally;
C. desulfurated plaster is handled: sintering and means of flue gas desulfurization of power plant gypsum are processed into terra alba through stoving oven;
D. the slag micro powder that step a, b, c are obtained, slag micropowder, terra alba, cement clinker, admixture and water mixing production building block cement, wherein the quality percentage composition of each component is:
Slag micro powder and slag micropowder 78% ~ 85%,
Terra alba 12% ~ 18%,
Cement clinker 5% ~ 8%,
Admixture and water surplus; Described admixture is Wingdale and alkalimetal silicate;
E. dewatered sludge, the dried slag of blast furnace, slag, coal ash slag, coal gangue crushing and screening are made aggregate: dewatered sludge and slag are from the converter steelmaking process by product, the dried slag of blast furnace is from the blast furnace ironmaking process by product, and coal ash slag and coal gangue come from the thermal power generation plant by-products;
F. with steps d gained building block cement, step e gained aggregate, be equipped with flyash and cement again, make building block through batching, stirring, moulding, maintenance;
G. with step a gained aggregate, be equipped with flyash and cement, make the city footway brick through batching, stirring, moulding, maintenance;
B. collect the waste coal gas that produces in the ferrous metallurgy process and be used for baking operation as fuel, part more than needed provides electric power by generating electricity by way of merging two or more grid systems for system;
C. reclaim factory effluent, return water of productive use after treatment again.
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| CN102534069A (en) * | 2012-02-03 | 2012-07-04 | 北京首钢国际工程技术有限公司 | Direct fine grinding process for pudding blast furnace granulated slag |
| CN102795797A (en) * | 2012-08-24 | 2012-11-28 | 北京首钢国际工程技术有限公司 | Blast-furnace slag ultrafine grinding machine and storage method |
| CN102864251A (en) * | 2012-09-17 | 2013-01-09 | 山西太钢不锈钢股份有限公司 | Method for enhancing separation utilization ratio of steel slag |
| CN102899481A (en) * | 2011-07-29 | 2013-01-30 | 王振江 | Calcium-magnesium sintering additive and production process flows thereof |
| CN103058542A (en) * | 2012-12-18 | 2013-04-24 | 上海市建筑科学研究院(集团)有限公司 | Novel steel mineral powder composite admixture excitant, and preparation and use methods of same |
| CN103553461A (en) * | 2013-10-22 | 2014-02-05 | 连云港市东茂矿业有限公司 | Method for making bricks from blast furnace water granulated slags |
| CN104291714A (en) * | 2014-06-13 | 2015-01-21 | 江苏融达新材料股份有限公司 | Production method for grinding steel-iron slag powder, mineral slag powder and steel slag powder by using vertical mill |
| CN104307614A (en) * | 2014-06-13 | 2015-01-28 | 江苏融达新材料股份有限公司 | A method of grinding steel slag powder and mine slag powder and producing steel and iron slag powder by a vertical grinding mill |
| CN104451003A (en) * | 2014-12-08 | 2015-03-25 | 南京南钢嘉华新型建材有限公司 | Steel and iron slag powder integrated system |
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| CN104628272A (en) * | 2015-02-10 | 2015-05-20 | 武汉理工大学 | Gradient utilization method for total components of steel slag |
| CN105087904A (en) * | 2015-09-29 | 2015-11-25 | 攀枝花钢城集团有限公司 | Iron powder tailing treatment technology |
| CN105219972A (en) * | 2015-10-30 | 2016-01-06 | 北方民族大学 | A kind of method utilizing high-carbon content flyash to reclaim iron in slag |
| CN105363549A (en) * | 2014-11-19 | 2016-03-02 | 晋江市冠兴建材有限责任公司 | Environment-friendly coal slag recycle and treatment system good in metal recycling effect |
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| CN106381351A (en) * | 2016-08-31 | 2017-02-08 | 云南德胜钢铁有限公司 | Waste slag steel recycling method |
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| CN106381351A (en) * | 2016-08-31 | 2017-02-08 | 云南德胜钢铁有限公司 | Waste slag steel recycling method |
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Application publication date: 20110518 |