溶銑予備処理からみた製銑-製鋼間における適正シリコン濃度の検討(脱珪)(<特集>溶銑処理の発展)

概要

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Optimum silicon contents in hot metal are estimated from the data based on the commercial converter operation in this paper. Estimations of optimum silicon content are tried in the case with or without the dephosphorization process between blast furnaces and converters. Metallurgical and economical evaluations are also made for several desiliconization methods. The results are summarized as follows : (1) Optimum silicon content on the process without hot metal dephosphorization treatment at [P]=0.110% If tapping-temperature is 1700℃, optimum [Si]≅0.40% If tapping-temperature is 1610℃, optimum [Si]≅0.20% (2) Optimum silicon content on the process with hot metal dephosphorization treatment by soda ash [Si]≦0.10% (3) Economical evaluations for hot metal desiliconization treatment (i) In the case of using iron oxide as desiliconization reagent If [Si] initial≧0.40%, BF runner method is better. If [Si] initial<0.40%, torpedo injection method is better. (ii) In the case of refining a high manganese steel, the largest benefit would be obtained by the desiliconization treatment with manganese ore on blast furnace runner, combining the dephosphorization treatment by soda ash and less-slag blowing in top and bottom blowing converter.
社団法人日本鉄鋼協会の論文
1983-11-01