Converter oxide and nitrogen top-blown dephosphorizing method

A converter, oxygen and nitrogen technology, applied in the manufacture of converters, etc., can solve the problems of unfavorable decarburization furnace heat balance, reduced dephosphorization effect, low carbon content of molten iron, etc., to inhibit the decarburization reaction, improve the gas supply intensity, prevent The effect of slag overflow at the furnace mouth
CN1552919AInactive Publication Date: 2004-12-08BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2004-12-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

An oxygen-nitrogen top blowing converter process for desulfurization is carried out by blowing oxygen-nitrogen at its top while blowing nitrogen or inertial gases at its bottom to desulfurise. Its top blowpipe controls oxygen blowing to desulfurise in two modes, with mixed gases at some ratio or with pure oxygen switched with pure nitrogen, in order to inhibit sputtering and to enhance stirring in smelting pool when sputter occurs by excessive oxidation, so that balance of (P) / [P] in dynamics is improved. It desulfurises better when bottom blowing is weak, can inhibit decarbonise reaction effectively with >70% recovery of Mn in molten iron, also, strengthen blowing at top to stir strongly and shorten pre-treat time, increase rate of desulfurization, control slag elimination in procedure effectively to prevent sputtering, and increase stability and security.
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Description

technical field

[0001] The invention belongs to the technical field of converter metallurgy, and mainly relates to molten iron pretreatment. Background technique

[0002] In recent years, the demand for high-grade steel, especially low-phosphorus steel, has greatly increased, which has strongly promoted the adoption and rapid development of the "three-stripping" pretreatment process for molten iron. The current development trend of the world's iron and steel industry is: on the basis of high continuous casting ratio, the steelmaking process technology focuses on the development of segmented steelmaking, that is, the formation of pre-desiliconization in the blast furnace casting house - pretreatment of molten iron to remove P, S - converter top and bottom combined blowing - outside the furnace Refining - the optimal process for continuous casting.

[0003] According to the different containers used, dephosphorization of molten iron can be divided into two categories: one is ...

Claims

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