上底吹き転炉を用いた転炉滓系フラックスによる溶銑脱りん(溶銑処理)(<特集>転炉機能の拡大)

概要

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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 12∿18 kg/t for the production of normal phosphorus steels.
社団法人日本鉄鋼協会の論文
1990-11-01