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Slag modifier and preparation method thereof

A technology of modifier and slag, which is applied in the field of steelmaking, can solve the problems of long slag splashing time, difficulty of slag blocking slag, lower melting point and viscosity of slag, etc., so as to improve the effect of slag splashing and furnace protection , Improve the effect of melting point and viscosity

Inactive Publication Date: 2019-12-13
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, if TFe is too high, it will increase the consumption of steel materials; on the other hand, because the slag TFe is too high, it will reduce the melting point and viscosity of slag, which will seriously affect the protection effect of converter slag splashing, and bring great pressure to the maintenance work of converter body; At the same time, it also causes slag splashing time to be too long, and furnace repairing and gunning time are more, which seriously affects the production rhythm; if TFe is too high, it will also cause the slag to be too thin and difficult to block slag, and the number of slag removal furnaces will increase the consumption of alloy deoxidizer and even cause serious pollution. molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw material preparation, ready lime powder Active lime powder with 85% CaO content, AD powder with 20% Al content, anthracite coal powder with 90% C, dolomite powder with 25% MgO as raw material ingredients, binder includes: bentonite 50%, methyl cellulose 25%, montmorillonite silicate 15%, fine-grained alumina 10%, the above raw materials are divided into lime powder 7%, AD powder 15%, anthracite coal powder 50%, dolomite powder 24% %, 4% of the binder is mixed together, and after fully stirring and mixing the prepared raw materials with a mixer, they are made into spherical particles with a diameter of 15mm by a ball pressing device. The pressure during the press molding process is 35Mpa. Dry in drying equipment, moisture 0.5% after drying

[0028] For steel type SPHC, the steel output of the converter is 130 tons, and the oxygen content at the end point is 500 ppm. Before the converter slag is splashed, 195 kg of modifier is added to the surface of the molten steel...

Embodiment 2

[0032] Raw material preparation, ready lime powder Active lime powder with 90% CaO content, AD powder with 25% Al content, anthracite coal powder with 92% C, dolomite powder with 28% MgO as raw material ingredients, binder includes: bentonite 40%, methyl cellulose 25%, montmorillonite silicate 25%, fine-grained alumina 10%, the above raw materials are divided into lime powder 10%, AD powder 12%, anthracite coal powder 55%, dolomite powder 20% %, the ratio of bonding 3% is mixed with the ingredients. After the prepared raw materials are fully stirred and mixed with a mixer, they are made into spherical particles with a diameter of 15mm by ball pressing equipment. The pressure during the press molding process is 38Mpa. Dried in drying equipment, moisture 0.6% after drying.

[0033] The steel type is Q235B, the steel output of the converter is 130 tons, and the oxygen content at the end point is 600ppm. Before the converter slag is splashed, 260kg of modifier is added into the f...

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Abstract

The invention discloses a slag modifier and a preparation method thereof. The modifier comprises the following materials with the following contents in percentage by weight: 5%-10% of lime powder, 40%-60% of fine anthracite, 15%-30% of dolomite powder, 5%-20% of AD powder and 2%-6% of binder. Because of containing C and Al, the modifier is capable of rapidly reducing the content of ferric oxide inslag and shortening a slag-splashing time, increasing the content of MgO in the slag, and increasing the melting point and viscosity, and thereby obviously improving the effect of slag-splashing protection for a converter. The slag modifier is capable of reducing the many consumption of fettling material, nitrogen and lime after being used for slag-splashing protection, and remarkable in economical benefit.

Description

technical field [0001] The invention belongs to the field of steelmaking, and in particular relates to a slag modifier and a preparation method thereof, which are used for reducing slag oxidation and optimizing the effect of slag splashing for furnace protection in the converter slag splashing protection stage. Background technique [0002] Due to the smelting of some low-carbon steels and low-phosphorus steels ([C]≤0.07%; [P]≤0.020%), the deep blowing at the end of converter smelting is serious, and the total iron content of the final slag of some furnaces even reaches more than 20% . On the one hand, if TFe is too high, it will increase the consumption of steel materials; on the other hand, because the slag TFe is too high, it will reduce the melting point and viscosity of slag, which will seriously affect the protection effect of converter slag splashing, and bring great pressure to the maintenance work of converter body; At the same time, it also causes slag splashing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C7/06
CPCC21C7/06C21C7/076C21C2007/0062Y02P10/20
Inventor 杜金科阎青王忠刚胡滨高志滨于亮涛张伟李四军付常伟李萍邹春峰石红燕刘辉
Owner SHANDONG IRON & STEEL CO LTD