MnO_2 酸化による BaO-BaCl_2-MnO 系フラックスを用いた高 Mn 溶鉄の脱りん

概要

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Dephosphorization process of high manganese molten iron with BaO-BaCl_2-MnO flux by oxidation of MnO_2, including slag recycle system, was investigated in a laboratory scale test. By using BaO-BaCl_2 flux of 100kg/t and MnO_2 of 10-15kg/t, dephosphorization yield of 70% was achieved at 1400℃, if the molten iron with manganese content of 18 mass% has carbon content of 2 mass%. To get satisfactory dephosphorization, (BaO)/(BaCl_2) mass% ratio in the slag should be controlled to 50/50-70/30, MnO content in the slag to 20 mass%, and (BaO)/(SiO_2) mass% ratio should be larger than 15. Phosphate capacity of the slag was calculated to be 10^<22.9>-10^<23.3>. Also, it is considered possible to use the slag repeatedly for dephosphorization by subsequent reduction of P_2O_5 in BaO-BaCl_2 slag with carbon at 1600℃.
社団法人日本鉄鋼協会の論文
1996-02-01