High-scrap-ratio KR molten iron desulfurization method

Abstract

The invention discloses a KR molten iron desulfurization method with a large scrap ratio, and belongs to the technical field of molten iron desulfurization. The method comprises the following steps that before KR molten iron desulfurization treatment, a pre-slag treatment mixture is added into the center of a ladle, the pre-slag treatment mixture is spread on the surface of slag, and the pre-slag treatment mixture comprises 60 wt%-70 wt% of soda ash, 10 wt%-14 wt% of titanium dioxide and 20 wt%-26 wt% of fluorite powder; a slagging-off plate is used for slagging off the slag added with the pre-slag treatment mixture for 20-30 s, and then the ladle is inclined; and after slagging-off is finished, the ladle is shaken to be normal, and complete slagging-off is carried out after the desulfurization reaction. According to the KR molten iron desulfurization method with the large scrap steel ratio, the slag viscosity can be obviously reduced by adding the pre-slag treatment mixture before slagging-off, the iron loss is reduced, the slagging-off time is shortened, and the temperature drop of molten iron is reduced; therefore, the technical problems of difficult slagging-off of front slag, large slagging-off iron loss, low desulfurization efficiency and the like in the molten iron pretreatment process under the condition that the large scrap steel ratio is 25%-30% are solved.

Description

A kind of large scrap ratio KR molten iron desulfurization method technical field The present invention relates to molten iron desulfurization technical field, more specifically, relate to a kind of large scrap ratio KR molten iron desulfurization method. Background technique The development of iron and steel industry directly affects the national economy, and while it contributes to the national economy, it also consumes It has a large amount of natural resources and brings great pressure to the environment. Unlike the limited natural resources of iron ore, scrap steel can be Recycled green resources. The use of scrap steel not only promotes the recycling of resources and the sustainable development of production, but also Reduce carbon emissions and NO x It has good economic and environmental benefits. The addition of scrap to the ladle is An important means for iron and steel enterprises to develop circular economy is the current development trend of China'...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects and shortcomings of the prior art, and the purpose is to provide a method for desulfurizing hot metal with a large scrap steel ratio KR. The method can significantly reduce the viscosity of slag, reduce iron loss, and reduce scraping by adding the pre-slag treatment mixture before slag removal. slag time and reduce the temperature drop of molten iron, thereby solving the technical problems such as difficulty in removing slag, large iron loss and low desulfurization efficiency in the pretreatment process of molten iron under the condition of large scrap steel ratio of 25% to 30%.

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