炭素飽和溶鉄と Na_2O-SiO_2 融体間のバナジウム, ニオブおよびアンチモンの分配平衡

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The vanadium, niobium, antimony distribution between Na_2O-SiO_2 melts and carbon-saturated iron were measured in the temperatures range from 1200℃ to 1350℃. Those for vanadium and niobium increased with increasing the Na_2O content in melts. Their temperature dependencies for the typical basic composition are expressed as follows ; log (%V)/[%V]=2410/T+0.187, log (%Nb)/[%Nb]=2360/T+1.34 The predominant species of vanadium under these conditions changed from V^<2+> to V^<5+> with increasing the Na_2O content, while those for niobium were Nb^<4+> and Nb^<5+>. The distribution of antimony decreased with increasing the Na_2O content up to 57 mol%, beyond which it decreased. Antimony species changed from Sb^<2+> to Sb^<4+> as melts became more basic. Since the distribution ratio is too small in this case, it would be impossible to remove antimony from carbon-saturated iron by the soda ash treatment. The activity coefficient of SbO_<1.5> in Na_2O-SiO_2 melts was calculated by measuring the activity coefficient of antimony in carbon-saturated iron in equilibrium with molten Cu-Sb alloys, which was 0.45 at 1200℃.
1985-05-01