Pre-melted type converter converter-rear slagging flux and manufacturing method thereof

Abstract

The present invention provides a pre-melted type converter converter-rear slagging flux and a manufacturing method thereof. The slagging flux comprises, by weight, 15-25% of white corundum, 35-45% of silica sand and 35-45% of white lime. The manufacturing method comprises the following steps: 1) baking raw materials: baking the white corundum, the silica sand and the white lime at a temperature of 70-200 DEG C, wherein the baking time is 0.5-1.5 hours, such that the water content is less than 0.5%; 2) carrying out mixing: stirring and mixing the white corundum, the silica sand and the white lime according to the ratio; 3) carrying out pre-melting: carrying out pre-melting for the white corundum, the silica sand and the white lime at the temperature of 1400-1700 DEG C, wherein the pre-melting time is 0.5-3 hours; 4) carrying out crushing: cooling the mixed material, and then crushing the cooled material into the particles with the particle size of 1-5 cm to obtain the slagging flux. The slagging flux of the present invention has characteristics of high purity, short slag formation time and high production efficiency, and can effectively improve the cleanliness of the steel. With adopting the slagging flux of the present invention, the impurity content in the converter-rear top slag can be reduced by 45-60%, and the slag formation time can be reduced by 30-50%.

Description

technical field [0001] The invention belongs to the converter steelmaking process, in particular to a pre-melted converter post-furnace slagging agent and a manufacturing method thereof. Background technique [0002] In the post-converter slagging process, high alumina bauxite is used as a slagging material to adjust the Al content of refining slag. 2 o 3 content. Chinese patent (Patent No. 200310111177.0) discloses a slagging process using dolomite, bauxite, and lime as slagging agents, the composition of which is CaO content of 65%-75%, SiO 2 Content 4%-10%, MgO content 1%-3%, Al 2 o 3 Content 7%-14%. [0003] In the above-mentioned patents, bauxite is used as Al in the top slag of molten steel after adjusting the converter furnace. 2 o 3 content of the main raw material. However, TiO in bauxite (for example) 2 , Fe 2 o 3 The content of other impurities accounts for 4.5%-5%, and the impurities in the slagging agent will pollute the molten steel. At the same tim...

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Problems solved by technology

However, TiO in bauxite (for example) 2 , Fe 2 o 3 The content of other impurities accounts for 4.5%-5%, and the impurities in the slagging agent will pollute the molten steel

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