Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Dephosphorization of Hot Metal in a Top and Bottom Blowing Converter with BOF-slag-based Flux
Tohru MATSUOSeiichi MASUDA
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1990 Volume 76 Issue 11 Pages 1809-1816

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Abstract

To improve the mass production process of both low-phosphorus and conventional grade steels more economically, a new hot metal dephosphorization process in a top and bottom blowing converter, called SRP, has been developed. In this process, BOF slag generated by the blowing of the dephosphorized hot metal is used as a dephosphorization agent of hot metal, implementing a two-stage slag-metal counter flow tank operation.
1. In a 2t laboratory scale test, phosphorus content of hot metal was lowered to less than 0.010% using BOF slag of 25 kg/t.
2. When silicon content of hot metal is less than 0.1%, CaO consumption necessary for producing normal phosphorus steels is calculated to be about 10 kg/t, and even low phosphorus steels can be obtained with calculated CaO of about 15 kg/t.
3. In this process, even non-desiliconized hot metal containing silicon of 0.2 0.4% can be dephosphorized with calculated CaO of 1218 kg/t for the production of normal phosphorus steels.

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© The Iron and Steel Institute of Japan
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