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100tLF原精炼终渣(/%:53.8CaO,8.16MgO,16.6Si02,17.45A1203,1.44TFe,1.26S,R3.08)优化成终渣(/%:51.3CaO,6.36MgO,25.0Si02,6.73A1203,2.96TFe,0.76S,R2.05)后,通过降低碱度和渣中A1203含量,65Mn钢(/%:0.63~0.65C,0.19—0.22Si,0.92~0.96Mn,0.005~0.006S,0.021~0.022P,0.0035~0.0037T[O])中的夹杂物当量个数由18.