Converter final-slag modifier and use thereof

A technology of modifier and converter end point, applied in the field of metallurgy, can solve the problems of complex operation, high dosage and high cost of modifier, and achieve the effects of low cost, reduced iron loss and good modification effect.

Active Publication Date: 2014-11-05
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the point of view of the modifying agent components in this invention, the cost of the modifying agent is relatively high, and it may need to be added during use, the operation is complicated, and the dosage is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The preparation method of the converter final slag modifier of the present invention comprises the following steps: mixing the raw materials, drying and roasting after cold pressing to obtain the finished converter final slag modifier. Appropriate amount of water is mixed evenly with a mixer, and the balls are pressed through a ball pressing machine, and then dried naturally for more than 72 hours, and then put into a baking oven for baking and sieving to finally obtain the finished product.

[0031] The converter final slag modifier of the present invention is preferably added before the converter is smelted and tapped, and the steel can be directly tapped after adding the converter final slag modifier for 10 to 30 seconds. The amount of converter final slag modifier added can be determined according to the oxygen activity of the end-point molten steel, which can be measured with a sub-lance after blowing: when the oxygen activity of the end-point molten steel of the co...

Embodiment 1

[0034] Converter final slag modifier is produced from converter dust, steelmaking sludge, waste magnesia bricks, anthracite and adhesives. Crumble the steelmaking sludge, waste magnesia bricks, anthracite, binder, and dedusting ash according to the weight ratio of 10:25:15:5:45, mix them evenly, press the balls through a ball press machine, and dry them naturally for 72 hours, and then into the oven for baking, sieving, and finally get modifier composition: CaO: 23%, SiO 2 : 3.5%, MgO: 26.3%, C: 12.7%, and the rest are unavoidable impurities.

[0035] In semi-steel smelting, after converter blowing, the oxygen activity of molten steel is measured to be 290ppm with a sub-lance, and a modifier of 3kg / t slag is added according to the oxygen activity of molten steel, and the steel is tapped directly after 10s. The total iron content is 16.1%.

Embodiment 2

[0037] Converter final slag modifier is produced from converter dust, steelmaking sludge, waste magnesia bricks, anthracite and adhesives. Crush the steelmaking sludge, waste magnesia bricks, anthracite, binder, and dedusting ash according to the weight ratio of 25:15:5:3:25, mix them evenly, and press the balls through a ball press machine, and dry them naturally for 72 hours, and then into the oven for baking, sieving, and finally get modifier composition: CaO: 23%, SiO 2 : 5.5%, MgO: 21.7%, C: 4.7%, and the rest are unavoidable impurities.

[0038] In semi-steel smelting, the oxygen activity of the molten steel is determined to be 500ppm with a sub-lance after blowing in the converter, and a modifier of 5kg / t slag is added according to the oxygen activity of the molten steel, and the steel is tapped directly after 15s. The total iron content is 17.1%.

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Abstract

The invention relates to a converter final-slag modifier and a use thereof, and belongs to the technical field of metallurgy. The invention provides the converter final-slag modifier and the use thereof. Active components of the converter final-slag modifier comprise, by weight, 13.5-37.5 parts of CaO, 2.4-7.5 parts of SiO2, 15-35 parts of MgO and 4-14 parts of C. The converter final-slag modifier can effectively reduce total iron content of furnace slag produced by semi-steel converter melting. The furnace slag modified by the converter final-slag modifier has total iron content reduced to 16%. Fly ash, steelmaking mud, waste magnesia brick, anthraciferous coal and a binder are mixed according to a certain ratio and are subjected to pressing ball to form balls of the converter final-slag modifier can be prepared so that secondary resource comprehensive utilization is realized. The converter final-slag modifier has a low cost and good modification effects and can effectively reduce iron loss.

Description

technical field [0001] The invention relates to a converter final slag modifier and an application thereof, belonging to the technical field of metallurgy. Background technique [0002] With the continuous progress of steelmaking technology, the technology of upgrading the final slag of the converter has been applied in major iron and steel enterprises. In the existing final slag upgrading technology, the upgrading of slag is mainly achieved by adding a modifier. There are two methods of adding the modifier: after blowing, before tapping, and after tapping; after modification, the viscosity of the slag at the end point increases, and the fluidity becomes poor, which can effectively prevent the conversion of the converter during tapping. The slag enters the ladle and pollutes the molten steel; the slag with high viscosity and high MgO content can effectively adhere to the furnace lining through slag splashing to protect the furnace lining, which plays a role in protecting th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
Inventor 陈均龚洪君李安林曾建华喻林梁新腾卿家胜陈路杨晓东朱鹏
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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