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Preparation method of pre-melting electroslag

A production method, the technology of premelting electroslag, which is applied in the field of premelting electroslag production methods, can solve the problems of large environmental pollution, poor slag uniformity, and large energy consumption, and achieve surface quality assurance, fast melting speed, and fluidity Good results

Inactive Publication Date: 2007-12-05
INNER MONGOLIA UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, there are disadvantages such as poor uniformity of slag, large environmental pollution, and long refining time.
Various powders need to be baked at a high temperature above 600°C for a long time, which consumes a lot of energy
Moreover, the purity requirements of various raw materials are relatively high, so the cost of slag is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Select the electroslag model DZ635, in which the mass fraction of materials: fluorite 0.20-0.65, high-alumina raw material 0.15-0.30, high-calcium raw material 0.05-0.10, high-magnesium raw material 0-0.10, and returned slag 0-0.60.

[0018] 1) Add the above-mentioned dry part of the material into the electric arc furnace, the material height is 0.5-1.0m, and sprinkle carbon powder and iron filings on the upper part of the material to facilitate arcing;

[0019] 2) Put down the electrodes, and after electrification, the carbon powder and iron filings start arcing, burn, and start smelting;

[0020] 3) The current is controlled by the insertion depth of the electrode, and the general control current is less than 100-300A;

[0021] 4) After the slag is smelted and cooled, it is broken, and the particle size is generally 1-40mm.

[0022] In order to ensure the continuous progress of the smelting process, various raw materials should be continuously added according to the ...

Embodiment 2

[0024] Select the electroslag model DZ622, in which the mass fraction of materials: fluorite 0.20-0.65, high-alumina raw material 0.15-0.22, high-calcium raw material 0.15-0.22, high-magnesium raw material 0-0.10, and returned slag 0-0.60.

Embodiment 3

[0026] Select the electroslag model DZ433, in which the mass fraction of materials: fluorite 0.20-0.45, high-alumina raw material 0.20-0.32, high-calcium raw material 0.20-0.32, high-magnesium raw material 0-0.10, and returned slag 0-0.60.

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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

1. Technical field: [0001] The invention relates to a production method of premelted electroslag, which belongs to the field of metallurgy, in particular to a refining slag system used in the electroslag melting and casting process. 2. Background technology: [0002] Most manufacturers in my country choose CaF in the electroslag casting process 2 -Al 2 o 3 Slag system, generally choose CaF 2 / Al 2 o 3 It is 7 / 3 refining slag. Since the composition of the 7 / 3 slag system is not at the eutectic point, the composition of the solidified slag skin is different from that of the molten slag. In this way, as the smelting progresses, the slag skin will continue to form, and the composition of the slag will continue to change, that is to say, the stability of the slag is relatively poor, which makes it difficult to stabilize the process parameters in the production process. The existing slag system for electroslag remelting is made by mixing fine powders such as alumina and flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B4/06B22D23/10
Inventor 宋希文
Owner INNER MONGOLIA UNIV OF SCI & TECH
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