CN100340677C - Slag regulating agent for super high power large electric furnace smelting - Google Patents
Slag regulating agent for super high power large electric furnace smelting Download PDFInfo
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- CN100340677C CN100340677C CNB2004100847870A CN200410084787A CN100340677C CN 100340677 C CN100340677 C CN 100340677C CN B2004100847870 A CNB2004100847870 A CN B2004100847870A CN 200410084787 A CN200410084787 A CN 200410084787A CN 100340677 C CN100340677 C CN 100340677C
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- slag
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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
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Abstract
The present invention relates to a technology for smelting by an ultra-high-power electric-arc furnace, particularly to a slag regulating agent for smelting by an ultra-high-power large electric furnace. The slag regulating agent for smelting by an ultra-high-power large electric furnace is characterized in that the slag regulating agent comprises the following ingredients (weight percentages %): 30 to 50 percent of C, 5 to 7 percent of Al, 8 TO 10 percent of Mg, 10 to 12 percent of Al2O3, 20 to 25 percent of Ca, 9 to 10 percent of SiC, and the rest is impurities; the bulk density of the slag regulating agent is from 1.8 to 2.0 g/cm <3>. The slag regulating agent of the present invention can uniformly and continuously produces foamed slag for the whole furnace and reduces FeO, Fe2O3, etc. in a slag layer, and thereby, the present invention has the advantages of smelting yield improvement and tapping alloy yield improvement; simultaneously, the continuous and stable foamed slag can improve the thermal efficiency of furnace smelting and reduce smelting electricity consumption. Due to the adjustment of the slag ingredients, the present invention also has the advantages of furnace slag dephosphorizing capacity improvement and furnace service life prolongation.
Description
(1) technical field
The present invention relates to the ultra-high power electric arc furnace smelting technology, relate in particular to slag regulating agent for super high power large electric furnace smelting.
(2) background technology
The ultra high power electric furnace that does not have the furnace wall carbonyl spray gun for only equipping slag door water-cooled carbon-oxygen gun, it is inhomogeneous generally all to exist carbon-oxygen gun spray carbon dust, spray carbon dust quantity not sufficient, thereby cause stove inner foam slag inhomogeneous, the characteristics of short, poor stability of foamy slag time length, often cause in the stove in the slag all iron content higher, smelt recovery rate on the low side, blow the serious problem of decreasing.It is a solution preferably that employing is added the slag conditioning agent while smelting, but existing super high power large electric furnace smelting is not also seen the report of relevant this respect.Adding the finishing slag slag supplying agent for converter smelting has report, discloses a kind of converter smelting finishing slag slag supplying agent as publication number CN 1264745, and its composition is (weight percent %) MgO 45～55, and CaO 4～9, and C 3～10, SiO
23～10, it mainly acts on is that to make principal phase be that the low-melting-point slag of iron protoxide changes the high-melting-point slag that principal phase is Dicalcium Phosphate (Feed Grade) and tricalcium silicate into, to improve the fusing point and the viscosity of converter finishing slag.This patent disclosure be converter finishing slag conditioning agent, the purpose of using is the MgO content that improves in the converter finishing slag, reduce the ferrous oxide content in the finishing slag, making principal phase is that the low-melting-point slag of iron protoxide changes the high-melting-point slag that principal phase is Dicalcium Phosphate (Feed Grade) and tricalcium silicate into, to improve the fusing point and the viscosity of converter finishing slag.
(3) summary of the invention
The object of the present invention is to provide a kind of slag regulating agent for super high power large electric furnace smelting, this slag supplying agent can to whole stove more evenly, making foamed slag constantly, FeO and Fe in the reduction slag blanket
2O
3Deng, smelt recovery rate, raising tapping yield of alloy thereby improve, and continual and steady foamy slag can improve the thermo-efficiency that stove is smelted, reduce melting electric consumption, owing to adjusted the composition of slag, can improve the dephosphorizing capacity of slag simultaneously, prolong the work-ing life of stove.
The present invention is achieved in that a kind of slag regulating agent for super high power large electric furnace smelting, and it is characterized in that the composition of slag supplying agent is (weight percent %): C 30～35, and Al 5～7, and MgO 8～10, Al
2O
310～12, CaO 20～25, and SiC 9～10, and all the other are impurity.
Above-mentioned slag regulating agent for super high power large electric furnace smelting, the volume density of described slag supplying agent are 1.8～2.0g/cm
3
Slag supplying agent of the present invention is block mainly based on carbon and lime, and lumpiness is 35 * 35 * 30mm
3About, can add in the stove by charging system and bell charge cavity from furnace top bin, this bulk slag supplying agent can sink and be suspended in the slag blanket after the adding stove is interior because proportion is fit to, and has avoided floating on the top of the slag by the shortcoming of scaling loss.This slag supplying agent combines with the carbon dust that sprays into from fire door carbon rifle, can to whole stove evenly, continue, making foamed slag stably, FeO and Fe in the reduction slag blanket
2O
3Deng, make all iron content in the slag drop to 20%～25% this suitable level, improve the purpose of smelting recovery rate, improving the tapping yield of alloy thereby reach.Continual and steady foamy slag can improve the thermo-efficiency that stove is smelted simultaneously; reduce melting electric consumption; and have working the slag basicity and a flowability; improve the dephosphorizing capacity of slag, the composition of adjustment slag; make that MgO content suitably raises in the slag, thereby play the anti-material of protection furnace wall magnesia carbon brick, prolong the effect of furnace campaign.Owing to improved the performance of foamy slag, improved thermo-efficiency, make the electrosmelting cycle correspondingly shorten to some extent, and because the effect of foamy slag, reduced the radiation of arclight, for the prolongation of lining life provides solid guarantee, Graphite Electrodes has also reduced loss per ton steel owing to having reduced oxidation, has obtained huge metallurgical effect and economic benefit.Improving aspect the quality of molten steel, omnidistance evenly, foamy slag stable, that continue can prevent that molten steel is air-breathing.
(4) embodiment
A kind of slag regulating agent for super high power large electric furnace smelting, its composition are (weight percent %): C 30～35, and Al 5～7, and MgO 8～10, Al
2O
310～12, CaO 20～25, and SiC 9～10, and rest part is an impurity, and the volume density of slag supplying agent is 1.8～2.0g/cm
3
Preparation method: with materials such as carbon dust, fat lime, aluminium slag and the magnesia shape of claying into power earlier, add an amount of common bond then and mix thoroughly, with its briquetting glomeration, then pressure ball is toasted with special machinery, reduce the water content of briquetting, increase the intensity of briquetting.
Concrete using method: in the super high power large electric furnace smelting process, add by the top filling system in the stove when dividing 3～4 batches behind the about 25000Kwh of melting electric consumption (as have ready conditions to add continuously then effect is better), the slag supplying agent that adds in the stove combines with the carbon dust of slag door carbon rifle winding-up, in stove evenly, stable, making foamed slag constantly, FeO and Fe in the reduction slag blanket
2O
3Deng oxide compound.The consumption of slag regulating agent for super high power large electric furnace smelting of the present invention is about ton steel 6～7Kg/t.s.
Embodiment:
Referring to table 1, table 2, table 1 is the testing data summary sheet; Table 2 is a composition of testing the corresponding electric furnace slag supplying agent of sequence number with table 1.
Table 1
Table 2
| Corresponding test sequence number | C | Al | MgO | Al 2O 3 | CaO | SiC | Impurity | Volume density |
| Unit | ％ | ％ | ％ | ％ | ％ | ％ | ％ | g/cm 3 |
| 1、2 | 30.5 | 5.4 | 9.9 | 11.9 | 22.3 | 9.3 | 11.2 | 1.86 |
| 3、4、5 | 33.1 | 6.1 | 9.2 | 10.8 | 23.7 | 9.5 | 7.6 | 1.92 |
| 6、7 | 34.9 | 6.8 | 8.1 | 10.2 | 24.9 | 9.9 | 5.2 | 1.96 |
The foregoing description carries out in 150 tons of super high power large electric furnace smelting processes, behind the about 25000Kwh of power consumption, divide 3～4 batches to add in the stove (as have ready conditions to add continuously then effect is better) about 1 ton slag supplying agent by the top filling system, the slag supplying agent that adds combines with the carbon dust of slag door carbon rifle winding-up, making foamed slag uniformly and stably in stove, FeO in the reducing slag and Fe
2O
3Deng oxide compound, make all iron content in the slag in the electric furnace stove on average from certain year 36.30% dropped to 24.71%, the FeO content in the slag has also correspondingly dropped to 19.68% by 32.10%, has obtained good effect.Average tapping temperature keep with certain year suitable situation under, use by slag supplying agent, improved foamy slag situation whole in the electric furnace stove, substantially realized the purpose that omnidistance submerged arc is smelted, improved the thermo-efficiency of electrosmelting, average electric power consumption per ton steel has dropped to 279.9Kwh/t.s from the 290.4Kwh/t.s in certain year.Smelting has also dropped to 24.57Kg/t.s from 36.69Kg/t.s with lime consumption, the corresponding shortening to some extent of electrosmelting cycle, simultaneously owing to improved the effect of foamy slag, reduced the radiation of arclight, for the prolongation of lining life provides solid guarantee, Graphite Electrodes has also reduced loss per ton steel owing to having reduced oxidation simultaneously, has obtained huge integrated metallurgical effect and economic benefit.Improving aspect the quality of molten steel, omnidistance evenly, foamy slag stable, that continue can prevent that molten steel is air-breathing, it is air-breathing and make defective such as the high reservation of nitrogen in steel ([N]) to eliminate molten steel.
Claims (1)
1. slag regulating agent for super high power large electric furnace smelting, it is characterized in that: the composition of slag supplying agent is counted with weight percent %: C 30～35, and Al 5～7, and MgO 8～10, Al
2O
310～12, CaO20～25, SiC 9～10, and all the other are impurity; The volume density of slag supplying agent is 1.8～2.0g/cm
3
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100847870A CN100340677C (en) | 2004-11-30 | 2004-11-30 | Slag regulating agent for super high power large electric furnace smelting |
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|---|---|---|---|
| CNB2004100847870A CN100340677C (en) | 2004-11-30 | 2004-11-30 | Slag regulating agent for super high power large electric furnace smelting |
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| CN1782101A CN1782101A (en) | 2006-06-07 |
| CN100340677C true CN100340677C (en) | 2007-10-03 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447272C (en) * | 2006-06-30 | 2008-12-31 | 宝山钢铁股份有限公司 | Electric arc furnace smelting stainless steel mother liquid steel slag foaming agent |
| CN100432240C (en) * | 2006-12-21 | 2008-11-12 | 马鞍山中冶钢铁冶金科技实业有限公司 | Electric furnace highly effective metallurgy complexing agent |
| CN102912079A (en) * | 2012-10-26 | 2013-02-06 | 攀枝花钢城集团瑞钢工业有限公司 | Submerged arc agent for steelmaking through steel-iron slag and application method of submerged arc agent |
| EP3042965A1 (en) * | 2015-01-09 | 2016-07-13 | S.A. Lhoist Recherche Et Developpement | Process for dephosphorization of molten metal during a refining process |
| CN110564917A (en) * | 2019-09-24 | 2019-12-13 | 山东钢铁股份有限公司 | Slag modifier and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07316631A (en) * | 1994-05-23 | 1995-12-05 | Sumitomo Metal Ind Ltd | Deoxidizing and cleaning method of molten steel |
| CN1264745A (en) * | 2000-02-22 | 2000-08-30 | 伍发贵 | Final slag modifier for smelting steel in converter |
| CN1286312A (en) * | 2000-04-29 | 2001-03-07 | 幸超 | Slag modifier for refining molten steel |
| JP2002038212A (en) * | 2000-07-27 | 2002-02-06 | Sumitomo Metal Ind Ltd | Slag modifier and method for producing high purity ultra-low carbon steel |
| CN1390958A (en) * | 2002-07-26 | 2003-01-15 | 重庆钢铁(集团)有限责任公司 | Deoxidizing slag-forming agent for ladle furnace |
| CN1408886A (en) * | 2002-09-23 | 2003-04-09 | 郭建华 | Aluminum-calcium slag and its preparing method |
-
2004
- 2004-11-30 CN CNB2004100847870A patent/CN100340677C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07316631A (en) * | 1994-05-23 | 1995-12-05 | Sumitomo Metal Ind Ltd | Deoxidizing and cleaning method of molten steel |
| CN1264745A (en) * | 2000-02-22 | 2000-08-30 | 伍发贵 | Final slag modifier for smelting steel in converter |
| CN1286312A (en) * | 2000-04-29 | 2001-03-07 | 幸超 | Slag modifier for refining molten steel |
| JP2002038212A (en) * | 2000-07-27 | 2002-02-06 | Sumitomo Metal Ind Ltd | Slag modifier and method for producing high purity ultra-low carbon steel |
| CN1390958A (en) * | 2002-07-26 | 2003-01-15 | 重庆钢铁(集团)有限责任公司 | Deoxidizing slag-forming agent for ladle furnace |
| CN1408886A (en) * | 2002-09-23 | 2003-04-09 | 郭建华 | Aluminum-calcium slag and its preparing method |
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| CN1782101A (en) | 2006-06-07 |
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