CN100352955C - Preparation method of pre-melting electroslag - Google Patents
Preparation method of pre-melting electroslag Download PDFInfo
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- CN100352955C CN100352955C CNB2005101325247A CN200510132524A CN100352955C CN 100352955 C CN100352955 C CN 100352955C CN B2005101325247 A CNB2005101325247 A CN B2005101325247A CN 200510132524 A CN200510132524 A CN 200510132524A CN 100352955 C CN100352955 C CN 100352955C
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- electroslag
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Abstract
The present invention relates to a method for producing premelted electroslag, which belongs to the field of metallurgy. The present invention is characterized in that a material respectively comprises the raw materials with the mass fractions that fluorite with the mass fraction of 0.20 to 0.65, a high-aluminum raw material with the mass fraction of 0.15 to 0.32, a high-magnesium raw material with the mass fraction of 0 to 0.10, a high-calcium raw material with the mass fraction of 0.05 to 0.32 and returned slag with the mass fraction of 0 to 0.6, part of the material is added into an electric-arc furnace, the material height is from 0.5 to 1.0MM, and carbon powder and iron filings are spread on the upper part of the material; electrodes are put down, and the carbon powder and the iron filings start arc, combust and start smelting after energized; after slag smelting is completed and the slag is cooled, the slag is crushed, and the granularity is from 1 to 40MM in general. All the slag system compositions of the present invention are close to a eutectic melting point, which avoids slag segregation and ensures the chemical stability of the slag. The slag after premelted has the advantages of uniform chemical compositions, high melting speed and no dust pollution, and thereby, the premelted slag has favorable energy-saving and environment protecting effects.
Description
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 molten 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
20.20-0.65, alumine or commercial alumina 0.15-0.32, industrial magnesia or rhombspar 0-0.10, lime 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, control current 100-300A;
5) the slag melting is finished, behind the naturally cooling, is carried out fragmentation, and granularity is 1-40mm.
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 (2)
1, the production method of pre-melting electroslag is characterized in that: adopt following technology:
1) with following exsiccant raw material: fluorite 0.20-0.65, alumine or commercial alumina 0.15-0.32, industrial magnesia or rhombspar 0-0.10, lime 0.05-0.32 and electroslag casting are returned slag 0-0.6 and are prepared 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, control current 100-300A;
5) after the slag melting is finished, cooled off, carry out fragmentation, granularity 1-40mm.
2, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101325247A CN100352955C (en) | 2005-12-26 | 2005-12-26 | Preparation method of pre-melting electroslag |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101325247A CN100352955C (en) | 2005-12-26 | 2005-12-26 | Preparation method of pre-melting electroslag |
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| CN1804065A CN1804065A (en) | 2006-07-19 |
| CN100352955C true CN100352955C (en) | 2007-12-05 |
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| CNB2005101325247A Expired - Fee Related CN100352955C (en) | 2005-12-26 | 2005-12-26 | Preparation method of pre-melting electroslag |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407321B (en) * | 2010-09-21 | 2014-06-04 | 鞍钢股份有限公司 | Electro slag remelting slag and manufacturing 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 |
| 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 |
| CN105039732B (en) * | 2015-08-17 | 2017-07-11 | 东北大学 | The electroslag remelting preparation method of low silicon pre-melted slag |
| 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 |
| 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 |
| CN115287464B (en) * | 2022-07-30 | 2023-04-28 | 宝钢轧辊科技有限责任公司 | Electroslag remelting method for preventing abnormal precipitation of carbide on surface layer of cold roll |
Citations (2)
| 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 |
-
2005
- 2005-12-26 CN CNB2005101325247A patent/CN100352955C/en not_active Expired - Fee Related
Patent Citations (2)
| 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 |
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| CN1804065A (en) | 2006-07-19 |
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