CN102181588B - Method for recycling refined casting residues during steelmaking in steel plant - Google Patents
Method for recycling refined casting residues during steelmaking in steel plant Download PDFInfo
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- CN102181588B CN102181588B CN2011100693463A CN201110069346A CN102181588B CN 102181588 B CN102181588 B CN 102181588B CN 2011100693463 A CN2011100693463 A CN 2011100693463A CN 201110069346 A CN201110069346 A CN 201110069346A CN 102181588 B CN102181588 B CN 102181588B
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- lime
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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
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for recycling refined casting residues during steelmaking in a steel plant. The method is characterized by comprising the following steps of: recycling the refined casting residues produced during steelmaking; performing the conventional processing to obtain dry blocky and/or powdery casting residues; during convertor steelmaking, adding 20 to 30 kg of casting residues serving as fluxing residue agents based on each ton of steel into a converter by using a steel scrap trough of the converter along steel scraps or by using an overhead bunker along a first batchof lime; adding the lime into the powdery casting residues according to the proportion of (3-8):(2-5); performing dry pressing for pelletization, wherein the particle size is 20 to 40 mm; adding intoa steel ladle through a furnace rear bin in the steel tapping process; and adding the casting residues into a desulfurizing agent, wherein the added casting residues is in an amount which is 30 to 50percent of the total weight of the desulfurizing agent. By the method, the casting residues produced during steelmaking is recycled after being recovered and processed, a large number of water resources required by hydro-thermal treatment are saved, steam and dust are not generated, pollution to the ambient environment is prevented, and the casting residues serving as resources in the steelmakingprocess can be utilized to the greatest extent.
Description
Technical field
The present invention relates to slag the recycle method in steel-making, the especially steelworks refining residual casting slag recycle method in steel-making that a kind of Iron And Steel Industry produces.The said refining residual casting slag general reference of the application: the ladle top slag after refining modes such as LF ladle furnace are handled.
Background technology
Iron And Steel Industry is the metallurgy industry of energy intensive, resource-intensive, and China's crude steel output reached 5.68 hundred million tons in 2009, accounted for 46.41% of world's crude steel ultimate production.Slag accounts for the major portion of Iron And Steel Industry solid waste, and blast furnace slag accounts for 30% of output of steel, and converter slag accounts for 12% of output of steel, and refining slag accounts for 3% of output of steel.Along with the fast development of Iron And Steel Industry, the quantity of iron and steel slag increases thereupon, and " zero release " of iron and steel slag becomes Iron And Steel Industry and walk the recycling economy road, realizes the major issue of Sustainable development.Make good use of the solid waste that produces in the smelting iron and steel production process effectively and reasonably and become each big steel enterprise problem demanding prompt solution.
Approach silicate cement for blast-furnace slag owing to its composition, and (CaO) exists not have free in the slag, existing basically entirely as the cement base-material.And it is high for copper smelter slag (casting surplus slag after containing steel-making slag and refining) owing to alkalescence; Free f (CaO) height in the slag is can not be as blast furnace slag, as the cement base-material under the condition of special processing; Even can not make pavior, so its recycling is restricted always.And this slag can automatic efflorescence occur owing to have phase transformation in the process of cooling because of undergoing phase transition when freely cool off placement slag field, and the slag granularity after the efflorescence is more than 200 orders, and volume is multiplied, and this all brings puzzlement for storage, stacking, transportation.
At present domestic formation as yet separately to the treatment process of steelworks refining residual casting slag, great majority all are after handling by the treatment process of converter slag, and wherein slag iron recovery is used.Because the limitation that this technology exists need in the treating processes to spray big water gaging, and the processing cycle is longer.The scene is easy to generate a large amount of steam and dust, causes great influence to surrounding environment.Tailings after the processing is because of containing a large amount of free calcium oxide f (CaO), free magnesium f (MgO), all fails to obtain good use always.Some steelworks has been stacked a large amount of tailings, not only contaminate environment but also land occupation; What is more important: residual casting slag (the surplus slag of casting after the steel-making refining) itself is exactly a kind of resource; Through taking rational way of recycling; Just can be implemented in the steelworks recycle, bring into play its affinability, realize the maximum using of refining residual casting slag resource; Help Iron And Steel Plant's development low-carbon economy, recycling economy.
Summary of the invention
The present invention is directed to prior art steel mill refining residual casting slag in steel-making, do not obtain basically recycle, through the processing of hot application method need to spray big water gaging, be easy to generate a large amount of steam and dust, the pollution surrounding environment; And the above-mentioned deficiency such as land occupation when stacking of the refining residual casting slag after hot application is handled; Provide a kind of the refining residual casting slag is carried out cyclic utilization method at a plurality of stations of steelmaking process; To realize the Iron And Steel Industry recycling economy road of " zero release ", make residual casting slag can obtain maximum using as the resource of steelmaking process.
Technical scheme of the present invention: the recycle method of steelworks refining residual casting slag in steel-making; It is characterized in that: the refining residual casting slag that produces of will making steel reclaims; Carry out conventional cooling break process, magnetic separation separating treatment, the anti-efflorescence processing of insulation, obtain exsiccant bulk and/or powdery residual casting slag.
(1) when converter steelmaking, residual casting slag is as fluxing and dissolving agent, and the steel scrap hopper through converter adds in converter with first lime with steel scrap or high hopper; Residual casting slag is that 20-30 kg/ton steel, residual casting slag are 20-30 kg/ton steel with lime adding amount with the amount that steel scrap adds separately;
(2) as the CAS ladle top slag modifier: allocate a certain amount of active lime in the powdery residual casting slag into, the dry-pressing balling-up, granularity is 20-40mm, in tapping process, adds in the ladle through feed bin behind the stove; The proportioning ratio of residual casting slag and lime is: 2-5:3-8;
(3) as the molten iron pre-desulfurization additive, residual casting slag is added in the sweetening agent, the residual casting slag add-on is 30%-50% of a sweetening agent weight, in the molten iron pre-desulfurization operation, adds in the hot metal ladle; The residual casting slag granularity is controlled at: 1-5mm, the proportioning ratio of residual casting slag and sweetening agent is: 2-5:3-8.
Further characteristic is: allocate residual casting slag into an amount of light heat insulation material commonly used, as covering agent in the calcium aluminate; The part by weight of residual casting slag and light heat insulation material is 0.5-1:0.2-0.6.
The proportioning ratio of said residual casting slag and lime is 1:1, and the proportioning ratio of residual casting slag and sweetening agent is 1:1, and the part by weight of said residual casting slag and light heat insulation material is 2:1.
The recycle method of steelworks refining residual casting slag of the present invention in steel-making has following characteristics:
1, will make steel the residual casting slag that produces reclaims; After carrying out conventional cooling break process, magnetic separation separating treatment, the anti-efflorescence processing of insulation; Obtain bulk and/or powdery residual casting slag,, add 4 or 5 stations of steelmaking process separately or with other components as covering agent in converter steelmaking fluxing and dissolving agent, CAS ladle top slag modifier, molten iron pre-desulfurization additive, the continuous casting etc.; Obtain recycle, make residual casting slag can obtain maximum using as the resource of steelmaking process.
2, need not carry out traditional hydrothermal treatment consists to the refining residual casting slag, more not need land occupation to handle the back tailings to stack, the great lot of water resources that conserve water thermal treatment is required does not produce steam and dust, and surrounding environment is not produced pollution.
3, in recycle, save or reduced the consumption of steel-making with materials such as lime, bauxitic clay, middle covering agents, reduced steel-making cost.
Description of drawings
Fig. 1 is a refining residual casting slag comprehensive utilization process schema of the present invention
Embodiment
The recycle method of steelworks refining residual casting slag of the present invention in steel-making; It is characterized in that: the refining residual casting slag that produces of will making steel reclaims; Carry out conventional cooling break process, magnetic separation separating treatment, the anti-efflorescence processing of insulation; After screening, obtain exsiccant bulk and/or powdery residual casting slag;
1, when converter steelmaking, block residual casting slag adds in the converter with first lime with steel scrap or high hopper through the steel scrap hopper as fluxing and dissolving agent; Residual casting slag is that 20-30 kg/ton steel, residual casting slag are 20-30 kg/ton steel with lime adding amount with the amount that steel scrap adds separately;
2, as the CAS ladle top slag modifier: allocate a certain amount of active lime (coating lime) in the block residual casting slag into, the dry-pressing balling-up, granularity is 20-40mm, in tapping process, adds in the ladle through feed bin behind the stove; The proportioning ratio of residual casting slag and lime is: 2-5:3-8; Residual casting slag and lime desulfurization agent additional proportion scope can suitably be adjusted, as: 2:8,2:7,2:6,2:5,2:4,3:8,3:7,3:6,3:5,3:4,3:3,4:8,4:7,4:6,4:5,4:4,4:3,5:8,5:7,5:6,5:5,5:4,5:3 etc.;
3, as the molten iron pre-desulfurization additive, residual casting slag is added in the sweetening agent, the residual casting slag add-on is 30%-50% of a sweetening agent weight, in the molten iron pre-desulfurization operation, adds in the hot metal ladle; The residual casting slag granularity is controlled at: 1-5mm, sweetening agent mainly are existing lime desulfurization agent, and its granularity and residual casting slag granulometric facies are same, and the proportioning ratio of residual casting slag and lime is: 2-5:3-8; Residual casting slag and lime desulfurization agent additional proportion scope can suitably be adjusted, as: 2:8,2:7,2:6,2:5,2:4,3:8,3:7,3:6,3:5,3:4,3:3,4:8,4:7,4:6,4:5,4:4,4:3,5:8,5:7,5:6,5:5,5:4,5:3 etc.;
Allocate residual casting slag into an amount of light heat insulation material commonly used, adjust fusing point and will be cheaply covering agent in the calcium aluminate; The part by weight of residual casting slag and light heat insulation material is 0.5-1:0.2-0.6.
The proportioning ratio of said residual casting slag and lime is 1:1, and the proportioning ratio of residual casting slag and sweetening agent is 1:1, and the part by weight of said residual casting slag and light heat insulation material is 2:1.
The refining residual casting slag main mine that steelmaking process produces is low-melting 12CaO7 Al mutually
2O
3, 12CaO7 Al
2O
3Existing ladle refining process all replaces fluorite as the fusing assistant under the slag basic with it; Because its adding can form the low-melting calcium aluminate of one deck rapidly on the lime surface; Can stop lime top layer HMP Dicalcium Phosphate (Feed Grade) (barrier material of Dicalcium Phosphate (Feed Grade) C2S lime fusing, when lime adds in the steel melting furnace, the SiO2 that brings into because of steel scrap etc. can form one deck Dicalcium Phosphate (Feed Grade) C2S shell rapidly on the lime top layer; The C2S fusing point is more than 2000 ℃; Its formation will hinder the fusing of lime, be the barrier material of lime fusing) form, the fusing of lime is risen make positive fluxing action.
The quick fusing of lime can promote the raising of steelmaking process dephosphorization efficient.Formula (2) is that the thermodynamics of dephosphorization is expressed formula.This expression formula shows that low temperature, high alkalinity, hyperoxia voltinism help the carrying out of dephosphorisation reaction.But in the actual production process, guarantee the fusing of lime, promptly obtain the high alkalinity slag, because of the effect of C2S shell, dephosphorisation reaction all can not carry out at low temperatures in fine assurance, the restriction of receiving of the raising slag of dephosphorization efficient.Therefore, can obtain the key that overbasic slag is the dephosphorisation reaction high efficiency at low temperatures.
4CaO+5[O]+2[P]=4aO.P
2O
5 (2)
ΔG
0=-1459.8+0.6164T,?KJ/mol
The Al of adding about 5% in steel melting furnace
2O
3, because its fluxing action can make the molten bath have high dephosphorization efficient.But Al
2O
3Though its acidity only is SiO
21/3, but be acidic oxide after all, so it excessively adds affiliation because of influencing slag alkalescence, dephosphorization efficient is reduced.By figure reflection Al
2O
3Maximum adding quantity must be controlled in 6%.
Thus, the present invention will be through reclaiming residual casting slag specially, and cool off break process, magnetic separation separating treatment, the anti-efflorescence of insulation and handle, to obtain block and powdered drying residual casting slag.
This technological key point is: the classification of residual casting slag is reclaimed, the anti-efflorescence of insulation is handled, and obtains the dry residual casting slag of bulk and/or powdery.
Claims (3)
1. the recycle method of steelworks refining residual casting slag in steel-making; It is characterized in that: the refining residual casting slag that produces of will making steel reclaims; Carry out conventional cooling break process, magnetic separation separating treatment, the anti-efflorescence processing of insulation, obtain exsiccant bulk and/or powdery residual casting slag;
(1) when converter steelmaking, block residual casting slag is as fluxing and dissolving agent, and the steel scrap hopper through blast furnace adds in converter with first lime with steel scrap or high hopper; Residual casting slag is that 20-30 kg/ton steel, residual casting slag are 20-30 kg/ton steel with lime adding amount with the amount that steel scrap adds separately;
(2) as the CAS ladle top slag modifier: allocate active lime in the block residual casting slag into, the dry-pressing balling-up, granularity is 20-40mm, in tapping process, adds in the ladle through feed bin behind the stove; The proportioning ratio of residual casting slag and lime is: 2-5:3-8;
(3) as the molten iron pre-desulfurization additive, residual casting slag is added in the sweetening agent, in the molten iron pre-desulfurization operation, add in the hot metal ladle; The residual casting slag granularity is controlled at: 1-5mm, the proportioning ratio of residual casting slag and sweetening agent is: 2-5:3-8.
2. according to the recycle method of the said steelworks refining of claim 1 residual casting slag in steel-making, it is characterized in that: allocate residual casting slag into light heat insulation material commonly used, as covering agent in the calcium aluminate; The part by weight of residual casting slag and light heat insulation material is 0.5-1:0.2-0.6.
3. according to the recycle method of the said steelworks refining of claim 2 residual casting slag in steel-making; It is characterized in that: the part by weight of said residual casting slag and lime is 1:1; The part by weight of residual casting slag and sweetening agent is 1:1, and the part by weight of residual casting slag and light heat insulation material is 2:1.
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| CN102181588B true CN102181588B (en) | 2012-10-31 |
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| JP5605339B2 (en) * | 2011-09-20 | 2014-10-15 | 新日鐵住金株式会社 | Recycling method of steelmaking slag |
| CN103031405B (en) * | 2011-11-29 | 2015-03-18 | 新疆八一钢铁股份有限公司 | Steel making technology for hot addition and transit of liquid steel slag in electric furnace |
| CN102517416A (en) * | 2011-12-30 | 2012-06-27 | 重庆大学 | Efficient dephosphorizing agent based on refined steel ladle after-cast recovery slag for revolving furnace |
| CN103031399A (en) * | 2012-05-31 | 2013-04-10 | 新疆八一钢铁股份有限公司 | Method for converter slagging regulation production |
| CN103031401B (en) * | 2012-09-26 | 2014-04-30 | 新疆八一钢铁股份有限公司 | Method for converter steelmaking by LF (Ladle Furnace) refining furnace reducing slag |
| CN103170591B (en) * | 2013-03-05 | 2015-08-26 | 新疆八一钢铁股份有限公司 | A kind of production technology of ladle molten steel coverture |
| CN103215408B (en) * | 2013-04-28 | 2015-10-28 | 山东广富集团有限公司 | A kind ofly add the method that slag block carries out converter steelmaking |
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| CN106834590A (en) * | 2016-12-25 | 2017-06-13 | 秦皇岛首秦金属材料有限公司 | A kind of method that ladle pours recrement converter reclaimer operation |
| CN107326149B (en) * | 2017-06-15 | 2019-05-17 | 山东钢铁股份有限公司 | A kind of ladle refining furnace refining slag circulation utilization method |
| CN109797338A (en) * | 2019-02-11 | 2019-05-24 | 黑龙江建龙钢铁有限公司 | A kind of big packet of square billet process pours remaining back to half ladle semisteel smelting technique |
| CN109897935B (en) * | 2019-03-19 | 2021-03-23 | 首钢集团有限公司 | Method for using cold-discarded tundish covering agent as converter slag agent |
| CN111349743B (en) * | 2020-03-30 | 2021-11-30 | 包头钢铁（集团）有限责任公司 | Energy-saving and emission-reducing method for recycling thermal-state casting residues |
| CN112226571A (en) * | 2020-09-28 | 2021-01-15 | 中冶建筑研究总院有限公司 | Method for preparing converter slagging agent by recovering refining slag |
| CN114045376A (en) * | 2021-10-18 | 2022-02-15 | 首钢集团有限公司 | Method for desulfurizing molten steel in converter tapping process |
| CN114231695B (en) * | 2021-12-01 | 2023-01-24 | 钢城集团凉山瑞海实业有限公司 | Semisteel heat-insulating covering agent pellet and preparation method thereof |
| CN115491444B (en) * | 2022-08-30 | 2024-01-30 | 马鞍山钢铁股份有限公司 | Method for preventing ladle from adhering and splashing by hot return of ladle casting residue to converter |
| CN116479214B (en) * | 2023-06-19 | 2023-10-27 | 江苏省沙钢钢铁研究院有限公司 | Synthetic slag and preparation method and application thereof |
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