Converter less slag smelting early stage deslagging control method

Abstract

The invention discloses a converter less slag smelting early stage deslagging control method in order to mainly solve the technical problems of difficult pour-out of early stage slag of a double slag + residual slag smelting technology and large deslagging rate fluctuation in the prior art. The converter less slag smelting early stage deslagging control method comprises the following steps: adding scrap steel, and adding molten iron; carrying out converter blowing desiliconization and dephosphorization; adding a slag foaming agent; pouring out early stage slag; carrying out converter blowing decarburization; carrying out converter tapping; and remaining slag. The converter blowing desiliconization, the lance position in the dephosphorization stage, the oxygen supply intensity and the lime and iron ore addition amount are controlled in the invention in order to make the dephosphorization rate of the converter early stage slag reach 60% or more; and the pour-out amount of the early stage slag in the double slag + residual slag smelting technology is accurately controlled through using the slag foaming agent and a weighing device arranged on a slag tank, and the converter slag accounts for 50-70% of the weight of total slag, so the converter double slag + residual slag smelting technology is realized.

Description

technical field [0001] The invention relates to a low-slag smelting process for converter steelmaking, in particular to a control method for slag dumping in the early stage of converter low-slag smelting, and belongs to the technical field of converter steelmaking. Background technique [0002] In the converter steelmaking process, the iron loss of the converter is closely related to the amount of slag. In recent years, in the face of fierce competition in the market environment, in order to reduce production costs and improve competitiveness, domestic and foreign iron and steel enterprises have successively begun to test and study the MURC (Multi-refining Converter) converter steelmaking process of Nippon Steel Corporation of Japan - "double slag + retained Slag" smelting process, "double slag + retained slag" smelting process is: adding scrap steel, blending into molten iron → converter desiliconization, dephosphorization → dephosphorization slag in the early stage → blowi...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a control method for slag dumping in the early stage of converter less-slag smelting, which mainly solves the technical problems that the slag is difficult to pour out and the slag dumping rate fluctuates greatly in the early stage of the converter "double slag + slag remaining" smelting process in the prior art

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