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Compound slag cleaning agent for electric furnaces and converters and preparation method thereof

A technology of compound slag and lotion, which is applied in the field of metallurgical auxiliary materials, can solve the problems of long slag formation time, low slag basicity, and increased acid-soluble aluminum content, and achieves reduction of smelting cost, reduction of refining procedures, and reasonable composition of components. Effect

Active Publication Date: 2015-12-09
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Or compounding, the oxygen potential in the molten steel cannot be effectively reduced after adding the alloy, and it is necessary to add deoxidized alloys such as ferrosilicon, aluminum, silicon-aluminum-barium-calcium during use, resulting in too low alkalinity in the slag and acid in the molten steel Increased dissolved aluminum content is unfavorable to desulfurization function and adsorption inclusion effect
If lime and desulfurization materials are added in the later refining process, the amount of slag will increase and the slagging time will be too long, which will increase the cost of smelting and the pollution of the environment and molten steel by additional components, and the slag has no dephosphorization and phosphorus-fixing elements, which cannot be achieved. The effect of dephosphorization needs to be dephosphorized during the pretreatment of molten iron
The above-mentioned defects are extremely unfavorable to the current steel situation and the development of high-end varieties of steel. It is necessary to convert the material components of the original refining agent and slag washing agent to solve the current use defects and meet the current cost and various components of molten steel. Control Index Requirements

Method used

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  • Compound slag cleaning agent for electric furnaces and converters and preparation method thereof
  • Compound slag cleaning agent for electric furnaces and converters and preparation method thereof
  • Compound slag cleaning agent for electric furnaces and converters and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take 30 parts of 100-mesh high-calcium lime, 20 parts of 60-mesh AD powder, 20 parts of 100-mesh barium carbonate (barium oxide content ≥ 75wt%), 15 parts of 100-mesh lightly burned dolomite, 15 parts of calcium carbide below 3mm, and pass through the disc After mixing and stirring evenly, put it into the plate to get the base material; then send it into the silo of the ball extruding machine through the conveying device; The material is extruded into balls; the balls are screened out by the conveying and screening device at the lower part of the ball extruding machine to obtain spherical products with a particle size of 25-35mm, and then packaged to obtain a qualified composite slag lotion finished product.

[0038]The mass percentages of the active ingredients in the finished product are as follows: calcium oxide: 34.5%, aluminum oxide: 19.6%, barium oxide: 15%, magnesium oxide: 4.5%, and calcium carbide: 12.75%.

Embodiment 2

[0040] Take 40 parts of 100-mesh high-calcium lime, 25 parts of 100-mesh AD powder, 15 parts of 100-mesh barium carbonate (barium oxide content ≥ 75wt%), 10 parts of 100-mesh lightly burned dolomite, and 10 parts of calcium carbide below 3mm. After mixing and stirring evenly, put it into the plate to get the base material; then send it into the silo of the ball extruding machine through the conveying device; The material is extruded into balls; the balls are screened out by the conveying and screening device at the lower part of the ball extruding machine to obtain spherical products with a particle size of 25-35mm, and then packaged to obtain a qualified composite slag lotion finished product.

[0041] The mass percentages of the active ingredients in the finished product are as follows: calcium oxide: 41%, aluminum oxide: 24.6%, barium oxide: 11.25%, magnesium oxide: 3%, calcium carbide: 8.5%.

Embodiment 3

[0043] Take 45 parts of 100-mesh high-calcium lime, 30 parts of 60-mesh AD powder, 7 parts of 100-mesh barium carbonate (barium oxide content ≥ 75wt%), 10 parts of 100-mesh lightly burned dolomite, and 10 parts of calcium carbide below 3mm. After mixing and stirring evenly, put it into the plate to get the base material; then send it into the silo of the ball extruding machine through the conveying device; The material is extruded into balls; the balls are screened out by the conveying and screening device at the lower part of the ball extruding machine to obtain spherical products with a particle size of 25-35mm, and then packaged to obtain a qualified composite slag lotion finished product.

[0044] The mass percentages of the active ingredients in the finished product are as follows: calcium oxide: 46.5%, aluminum oxide: 27.5%, barium oxide: 5.15%, magnesium oxide: 3%, calcium carbide: 8.5%.

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Abstract

The invention provides a compound slag cleaning agent for electric furnaces and converters and a preparation method thereof, and belongs to the technical field of metallurgical auxiliary materials. The compound slag cleaning agent comprises the following components in percentage by weight: calcium oxide 30-50%, alumina oxide 20-40%, barium oxide 5-20%, magnesium oxide 3-15%, and a reducing agent 5-15%. The comprehensive performance of the slag cleaning agent is outstanding the deoxidization, desulphurization and dephosphorization effect of the existing slag cleaning agent is improved and increased, the LF refining time is obviously shortened, the impurity absorption capacity is good, impurities are not introduced during smelting of molten steel; moreover, the kinds and proportion of the raw materials are reasonable, so that compared with the existing dephosphorization slag cleaning agent, the cost of the compound slag cleaning agent is obviously reduced, and the compound slag cleaning agent has obvious market advantage.

Description

technical field [0001] The invention belongs to the technical field of metallurgical auxiliary materials, and in particular relates to a composite slag lotion for electric furnaces and converters and a preparation method thereof. Background technique [0002] Composite slag lotion is a kind of metallurgical auxiliary material that enters molten steel slag during the tapping process of electric furnace and converter, and can remove unstable inclusions and harmful substances in steel. It is one of the important means to realize the purification of molten steel. Add composite slag lotion to the ladle to change the alkalinity and oxidation of the ladle slag, so that the slag after slag washing has a calcium-aluminate slag system with high alkalinity, low melting point, low iron oxide, and rich CaO content. The dynamic conditions of steel flow impact in the steel process increase the slag-steel reaction interface to achieve the purpose of desulfurization, deoxidation, and adsorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 李秀峰李秀忠
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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