BaO-塩化物系フラックスによるステンレス粗溶鋼の脱りん

概要

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Dephosphorization of crude stainless steel with BaO-based flux is investigated in a laboratory scale test and industrial AOD operation. By using BaO-BaCl_2-Cr_2O_3 flux or BaCO_3-BaCl_2-C flux of about 100kg/t, 60% dephosphorization is possible, if the crude stainless steel has a chromium content of 16 to 25% and a carbon content of 1 to 2%. In addition, a more than 90% desulphurization and removal of vanadium can also be achieved. To get satisfactory dephosphorization, Cr_2O_3 content in slag should be controlled in 3 to 6% with BaO content of 40 to 50%. Phosphate capacity of the slag (C_<PO_4^3>-≡(%PO_4^<3->)/(P_<P_2>^<1/2>・P_<O_2>^<5/4>)) is about 10^<22.7> at 1450℃. It is considered that this dephosphorization of crude stainless steel having a carbon content of 2% and a chromium content of 18% at 1450℃ proceeds with slightly higher oxygen potential of slag than that of metal.
社団法人日本鉄鋼協会の論文
1989-03-01