Cu-Feマットと銅の2液相分離範囲における銀の活量

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Silver activity in the immiscible region between the molten copper and Cu - Fe matte of the Cu - Fe - S system was measured by applying a double Knudsen cell - mass spectrometric method at 1,473 K for analyzing the behavior of minor elements in a copper smelting process. The silver distribution between the two phases in the miscibility gap was also determined to find the relationship of the silver activity and composition in both the matte and copper phases with a quenching technique at the same experimental temperature. The following results have been obtained in the present study. The distribution coefficient of silver between the matte and copper phases, which is defined by {% Ag in matte} / [%Ag in metal] decreases from 0.4 at the iron free Cu - Cu2S immiscible region to 0.29 at the composition of iron saturation with increasing iron content. The activity coefficient of silver at infinite dilution in the matte, γoAg changes from 9.9 in the Cu2S phase to 16 at γ - iron saturation in the Cu - Fe matte by addition of iron while the value of 3.3 for γoAg in the metal phase equilibrated with the matte phase is kept at almost constant. The value of 0.22 is obtained for εFeAg in molten copper by using the activity values in the copper phase combined with the reported values of εSAg in molten copper and γoAg in the Cu - Ag binary system. It is understood by the value of εFeAg obtained in the present study that the quite small change of γoAg is observed with increasing iron content in the copper phase of the Cu - Fe - S system. γoAgS0.5 in the matte phase is estimated from the distribution ratio of silver between the two phases combined with γoAg in the metal phase and ρS2 over the two phase region by assuming the formation of AgS0.5 in the matte phase. The obtained value for γoAgS0.5 changes from 0.81 in the iron free matte into 0.96 in the iron saturated matte, which exhibits nearly ideal behavior.
社団法人資源・素材学会の論文
2000-01-25

Cu-Feマットと銅の2液相分離範囲における銀の活量

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