CN1804065A - Preparation method of pre-melting electroslag - Google Patents

Preparation method of pre-melting electroslag Download PDF

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Publication number
CN1804065A
CN1804065A CN 200510132524 CN200510132524A CN1804065A CN 1804065 A CN1804065 A CN 1804065A CN 200510132524 CN200510132524 CN 200510132524 CN 200510132524 A CN200510132524 A CN 200510132524A CN 1804065 A CN1804065 A CN 1804065A
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melting
electroslag
raw material
production method
slag
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CN100352955C (en
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宋希文
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Inner Mongolia University of Science and Technology
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Inner Mongolia University of Science and Technology
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Abstract

The preparation method for premelting electroslag comprises: loading the material with 0.20-0.65 fluorite, 0.15-0.32 raw bauxite, 0-0.10 high raw magnesite, 0.05-0.32 high calcium material and 0-0.6 recovered slag in the arc furnace with material height as 0.5-1m; spreading carbon powder and iron filling on material top to arc and burn for melting after electrifying; cooling, and breaking with size as 1-40mm. this invention avoids slag segregation to ensure its chemical stability, has no dust pollution, and conserves energy.

Description

The production method of pre-melting electroslag
One, technical field:
The present invention relates to a kind of production method of pre-melting electroslag, belong to field of metallurgy, particularly relate to employed a kind of refining slag system in the electroslag casting process.
Two, background technology:
CaF selects in the most of producer of China in the electroslag casting process 2-Al 2O 3Slag system is generally selected CaF 2/ Al 2O 3It is 7/3 refining slag.Because the composition of 7/3 slag system is not in eutectoid point, it is different with the composition of slag therefore to solidify the slag crust that.Like this, along with the carrying out of smelting, slag crust constantly forms, and slag composition will constantly change, and that is to say the less stable of this slag, and this has determined that just the processing parameter in the production process is difficult to stablize.Existing esr all is to utilize fine powders such as aluminum oxide, fluorite to mix at the scene with slag system.So have the lack of homogeneity of slag, environmental pollution is big, shortcomings such as refining time length.Various powders also need baking for a long time under the high temperature more than 600 ℃, and energy consumption is bigger.And the purity requirement of various raw materials is higher, so the cost height of slag.
Three, summary of the invention
The technical problem that the present invention solves is: the raw material that utilization of the present invention is cheap, electroslag casting is carried out fritting, refining with refining slag, and low with production stable components, fusing point, burn-off rate is fast, and homogeneity is strong, and environmental pollution is little, refining time is short, and lower-cost pro-molten refining slag is.
Technical solution: the present invention adopts following technology:
1) with following exsiccant material: fluorite (CaF 2) 0.20-0.65, high aluminium material 0.15-0.32, high magnesium raw material 0-0.10, high calcium raw material 0.05-0.32 and electroslag casting return slag 0-0.6 by preparing burden by massfraction;
2) above-mentioned exsiccant partial material is joined in the electric arc furnace, height of materials is at 0.5-1.0m, and sprinkles carbon dust and iron filings on the top of material, so that the starting the arc;
3) put down electrode, the energising back carbon dust and the iron filings starting the arc, burning, beginning melting;
4) by electrode depth of penetration control current size, general control current is less than 100-300A;
5) the slag melting is finished, behind the naturally cooling, is carried out fragmentation, and granularity is 1-40mm.
High aluminium material is alumine or commercial alumina.
High magnesium raw material is industrial magnesia or rhombspar raw material.
The high calcium raw material is lime or rhombspar.
The massfraction of oxides-containing iron is 0.005-0.02 in the material, and the massfraction that can add coke powder is 0.001-0.008, so that with the reduction of the oxide compound of iron, sinks to furnace bottom and removes.
The composition of slag system of the present invention all near eutectoid point, has been avoided the segregation of slag, thereby has guaranteed the chemical stability of slag.After the fritting of slag process, the chemical constitution uniformity, the burn-off rate of this slag system is fast, and no dust pollution in the use is so this pre-melted slag has good energy-conservation and environment protecting.The slag crust that forms is thin and evenly, and good fluidity has guaranteed the surface quality of foundry goods.
By charge calculation, the present invention is with alumine, fluorite and to return slag etc. be raw material, utilizes 30 tons of three-phawse arc furnaces to smelt 2 heat pre-melting electroslags.The result shows that the composition of slag system is even, stable, and the technology that this invention is developed can satisfy the requirement of scale operation.
The composition of the slag (unit: massfraction) that sees attached list
The electroslag model CaF 2 Al 2O 3 CaO+ MgO SiO 2 FeO +Fe 2O 3
DZ635 0.57-0.63 0.28-0.32 0.04-0.06 0.04-0.06 ＜0.01
DZ622 0.57-0.63 0.18-0.22 0.18-0.22 ＜0.01 ＜0.01
DZ433 0.38-0.42 0.28-0.32 0.28-0.32 ＜0.01 ＜0.01
Four, embodiment
Embodiment 1
Choose electroslag model DZ635, wherein the massfraction of material: fluorite 0.20-0.65, high aluminium material 0.15-0.30, high calcium raw material 0.05-0.10, high magnesium raw material 0-0.10, return slag 0-0.60.
1) above-mentioned exsiccant partial material is joined in the electric arc furnace, height of materials is at 0.5-1.0m, and sprinkles carbon dust and iron filings on the top of material, so that the starting the arc;
2) put down electrode, the energising back carbon dust and the iron filings starting the arc, burning, beginning melting;
3) by electrode depth of penetration control current size, general control current is less than 100-300A;
4) after the slag melting is finished, cooled off, carry out fragmentation, granularity is generally at 1-40mm.
In order to guarantee constantly carrying out of fusion process, constantly add various raw materials, to guarantee the melting continuity by said ratio.
Embodiment 2
Choose electroslag model DZ622, wherein the massfraction of material: fluorite 0.20-0.65, high aluminium material 0.15-0.22, high calcium raw material 0.15-0.22, high magnesium raw material 0-0.10, return slag 0-0.60.
Embodiment 3
Choose electroslag model DZ433, wherein the massfraction of material: fluorite 0.20-0.45, high aluminium material 0.20-0.32, high calcium raw material 0.20-0.32, high magnesium raw material 0-0.10, return slag 0-0.60.

Claims (5)

1, the production method of pre-melting electroslag is characterized in that: adopt following technology:
1) with following exsiccant raw material: fluorite (CaF 2) 0.20-0.65, high aluminium material 0.15-0.32, high magnesium raw material 0-0.10, high calcium raw material 0.05-0.32 and electroslag casting return slag 0-0.6 and prepare burden by massfraction;
2) above-mentioned exsiccant partial material is joined in the electric arc furnace, height of materials is at 0.5-1.0m, and sprinkles carbon dust and iron filings on the top of material, so that the starting the arc;
3) put down electrode, the energising back carbon dust and the iron filings starting the arc, burning, beginning melting;
4) by electrode depth of penetration control current size, general control current is less than 100-300A;
5) after the slag melting is finished, cooled off, carry out fragmentation, granularity is generally at 1-40mm.
2, the production method of pre-melting electroslag according to claim 1 is characterized in that: high aluminium material is alumine or commercial alumina.
3, the production method of pre-melting electroslag according to claim 1 is characterized in that: the high magnesium raw material of the production method of pre-melting electroslag is industrial magnesia or rhombspar raw material.
4, according to the production method of the described pre-melting electroslag of claim 1, it is characterized in that: the high calcium raw material is lime or rhombspar.
5, according to the production method of the described pre-melting electroslag of claim 1, it is characterized in that: ferriferous oxide massfraction 0.005-0.02 in the material, can add the massfraction 0.001-0.008 of coke powder, so that with the oxide compound reduction of iron, sink to furnace bottom and remove.
CNB2005101325247A 2005-12-26 2005-12-26 Preparation method of pre-melting electroslag Expired - Fee Related CN100352955C (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102407321A (en) * 2010-09-21 2012-04-11 鞍钢股份有限公司 Electroslag remelting slag and manufacturing method thereof
CN102994768A (en) * 2012-08-13 2013-03-27 西峡县恒冠冶金材料有限公司 Electro-slag re-melting slag and preparation method thereof
CN103468965A (en) * 2013-09-25 2013-12-25 安徽工业大学 Electro-slag remelting refining slag efficiently utilizing return slag and preparing method and application method thereof
CN104561569A (en) * 2015-01-14 2015-04-29 中原特钢股份有限公司 Preparation and use process for electroslag remelting slag
CN105039732A (en) * 2015-08-17 2015-11-11 东北大学 Preparing method of low-silicon pre-melted slag for electroslag remelting
CN107338362A (en) * 2017-06-27 2017-11-10 中原特钢股份有限公司 A kind of electroslag novel conductive slag and preparation method thereof
CN114485147A (en) * 2022-01-21 2022-05-13 河南和成无机新材料股份有限公司 Quick ignition temperature-raising method for electric arc furnace
CN114643346A (en) * 2020-12-17 2022-06-21 沈阳铸造研究所有限公司 Multi-element pre-melted slag for electroslag casting, and preparation method and application thereof
CN115287464A (en) * 2022-07-30 2022-11-04 宝钢轧辊科技有限责任公司 Electroslag remelting method for preventing abnormal precipitation of carbides on surface layer of cold roll

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51140802A (en) * 1975-05-30 1976-12-04 Hitachi Ltd A process for production of an electro-slag remelting electrode
CN1417353A (en) * 2001-11-09 2003-05-14 上海盛宝钢铁冶金炉料有限公司 Production process of premelt calciun aluminate slag

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102407321A (en) * 2010-09-21 2012-04-11 鞍钢股份有限公司 Electroslag remelting slag and manufacturing method thereof
CN102407321B (en) * 2010-09-21 2014-06-04 鞍钢股份有限公司 Electroslag remelting slag and manufacturing method thereof
CN102994768A (en) * 2012-08-13 2013-03-27 西峡县恒冠冶金材料有限公司 Electro-slag re-melting slag and preparation method thereof
CN102994768B (en) * 2012-08-13 2014-04-02 西峡县恒冠冶金材料有限公司 Electro-slag re-melting slag and preparation method thereof
CN103468965A (en) * 2013-09-25 2013-12-25 安徽工业大学 Electro-slag remelting refining slag efficiently utilizing return slag and preparing method and application method thereof
CN103468965B (en) * 2013-09-25 2015-04-15 安徽工业大学 Preparation method for electro-slag remelting refining slag efficiently utilizing return slag
CN104561569A (en) * 2015-01-14 2015-04-29 中原特钢股份有限公司 Preparation and use process for electroslag remelting slag
CN105039732A (en) * 2015-08-17 2015-11-11 东北大学 Preparing method of low-silicon pre-melted slag for electroslag remelting
CN107338362A (en) * 2017-06-27 2017-11-10 中原特钢股份有限公司 A kind of electroslag novel conductive slag and preparation method thereof
CN114643346A (en) * 2020-12-17 2022-06-21 沈阳铸造研究所有限公司 Multi-element pre-melted slag for electroslag casting, and preparation method and application thereof
CN114643346B (en) * 2020-12-17 2023-08-18 沈阳铸造研究所有限公司 Multi-element premelting slag for electroslag casting and preparation method and application thereof
CN114485147A (en) * 2022-01-21 2022-05-13 河南和成无机新材料股份有限公司 Quick ignition temperature-raising method for electric arc furnace
CN114485147B (en) * 2022-01-21 2024-04-30 河南和成无机新材料股份有限公司 Fast ignition heating method for electric arc furnace
CN115287464A (en) * 2022-07-30 2022-11-04 宝钢轧辊科技有限责任公司 Electroslag remelting method for preventing abnormal precipitation of carbides on surface layer of cold roll

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