Method for controlling splashing in less slag smelting decarbonization period of converter

Abstract

The invention discloses a method for controlling splashing in the less slag smelting decarbonization period of a converter. The technical problem that splashing is likely to happen in the decarbonization period of the double slag and remaining slag smelting technology of a converter in the prior art is mainly solved. The method for controlling splashing in the less slag smelting decarbonization period of the converter comprises the following steps of steel scrap adding, molten iron charging, converter blowing desilicication and dephosphorization, pre-slag pouring, converter blowing decarbonization, converter tapping and slag remaining. By means of control over adding of limestone or dolomite in the converter blowing decarbonization period, the oxygen supply strength is controlled to be increased step by step during lance feeding blowing, and the problems of explosive splashing during lance feeding blowing and returning dry splashing in the blowing process in the decarbonization period are well controlled through adjustment on the lance height and the oxygen supply strength in the blowing process.

Description

technical field [0001] The invention relates to low-slag smelting in converter steelmaking, in particular to a control method for splashing in the decarburization stage of converter low-slag smelting, and belongs to the technical field of converter steelmaking. Background technique [0002] In the traditional converter smelting process, the mass fraction of Si in the furnace molten iron is generally in the range of 0.2% to 0.7%. After oxygen blowing smelting in the converter, Si is preferentially oxidized to form SiO 2 , SiO 2 The formation of slag accelerates the melting of lime and other slag-forming materials, and the low-temperature conditions in the early stage of blowing can be used to form slag with good fluidity in a short period of time without large splashing. [0003] In the existing technology, the "double slag + slag retention" smelting process of "adding scrap steel, mixing in molten iron → converter desiliconization and dephosphorization → dephosphorization...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for controlling the spattering during the decarburization period of the converter with less slag smelting, mainly to solve the technical problem of the spattering during the decarburization period of the "double slag + left slag" smelting process of the converter in the prior art

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