Convertor steelmaking method capable of reducing slag quantity

Abstract

The invention belongs to the technical field of convertor steelmaking, and provides a convertor steelmaking method capable of reducing slag quantity. The process flow disclosed by the invention is circular process flow starting with step of protecting a furnace by slag splashing and ending with the step of remaining slag in the furnace. The process flow specifically comprises the following eight stages: protecting a furnace by slag splashing; curing liquid slag in the furnace; adding scrap steel; adding molten iron; blowing-dephosphorizing at a first stage; deslagging in the middle; blowing-decarbonizing at a second stage; tapping; and remaining slag in the furnace. Compared with the conventional convertor steelmaking process, the convertor steelmaking provided by the invention has the beneficial effects that lime consumption is lowered by 40.5%, light-roasting dolomite consumption is lowered by 76.8%, and the total consumption of the lime and light-roasting dolomite is lowered by 55.5% on the premise that phosphorus content at the end point is not more than 0.015%.

Description

technical field [0001] The invention provides a converter steelmaking method for reducing the amount of slag, and belongs to the technical field of converter steelmaking. Background technique [0002] For the traditional converter steelmaking method, in order to ensure the dephosphorization effect, high alkalinity and large slag volume operations are often required, resulting in increased steel slag discharge and steel material consumption, which increases production costs. Many literatures have reported (such as [2007 China Iron and Steel Annual Conference Proceedings], 1 (2007), p.1-62) the amount of slag produced by traditional converter steelmaking is generally 120-150 kg per ton of steel, according to the CaO content in slag 40% calculation, the weight of CaO in the slag is generally 48-60 kg per ton of steel. Under the condition of using high-quality lime (CaO%=92), some literature (for example, [Steelmaking], 1 (2002), p.30) reported that the amount of lime per ton o...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a converter steelmaking method that reduces the amount of slag, which solves the problem of large consumption of lime and light-burned dolomite in the conventional converter steelmaking process, that is, greatly reduces the amount of steel slag generated, and the phosphorus content at the end of decarburization While meeting the smelting requirements, the metal yield is improved and the life of the converter is guaranteed

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