FeS-Na_2S 系フラックスと炭素飽和溶鉄間の銅の分配平衡

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Copper distribution between FeS-NaS_<0.5> flux and carbon saturated liquid iron has been studied at 1673 K. Copper distribution ratio, L_<Cu>=(mass%Cu)_<flux>/[mass%Cu]_<iron>, was about 9 when FeS only was used as sulfide flux. The addition of NaS_<0.5> to FeS increased the copper distribution ratio. The L_<Cu> showed the maximum value of about L_<Cu>=24, at around X_<NaS_<0.5>>=0.4, and became nearly constant at the range of higher NaS_<0.5> content than 0.4 of NaS_<0.5>. The addition of NaS_<0.5> also lowered sulfur content in liquid iron from 1.9mass% at X_<NaS_<0.5>>=0 to 0.04mass% at X_<NaS_<0.5>>=0.8. CuS_<0.5> dissolved in flux decreased L_<Cu> at high concentration range of NaS_<0.5>. In order to discuss the effect of NaS_<0.5> and CuS_<0.5> on the copper distribution, the activity coefficient of CuS_<0.5> in flux was evaluated. It was found that NaS_<0.5> decreased the activity coefficient of CuS_<0.5> in flux, so that the L_<Cu> increased in spite of the significant decrease of sulfur potential in the system by the addition of NaS_<0.5>.
社団法人日本鉄鋼協会の論文
1991-04-01