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

A technology of less slag smelting and control method, which is applied in the field of control of splash during the decarburization period of converter steelmaking with less slag and converter less slag smelting, and achieves the effect of improving stability and controlling splash problems.

Active Publication Date: 2016-04-27
SHANGHAI MEISHAN IRON & STEEL CO LTD
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AI Technical Summary

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

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific examples.

[0029] The "double slag + slag remaining" smelting process is used for steelmaking on a 150-ton top-bottom combined blowing converter, including the following steps: adding scrap steel, adding molten iron, desiliconization and dephosphorization by converter blowing, pouring the previous slag, and converter blowing Decarburization, converter tapping, leaving slag. Tables 1 to 5 are the key control parameters for converter slag-less smelting by the method of the present invention.

[0030] Table 1 Conditions of Secondary Metal Material in Converter Smelting Furnace

[0031]

[0032] Table 2 Converter blowing desiliconization, dephosphorization process parameters

[0033]

[0034] Table 3 Early stage deslagging process parameters of the present invention

[0035]

[0036] Table 4 Process parameters of converter blowing decarburization period of the present invention ...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C5/36
CPCY02P10/20
Inventor 陈志平左康林虞大俊夏兆东李玉娣
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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