以石墨为还原剂,将渣中稀土氧化物还原入液态Sn,测定1600℃下RE_2O_3-CaF_2和RE_2O_3-CaO-CaF_2渣中RE_2O_3的活度。实验在石墨坩埚中于1个大气压的CO气氛下进行,其反应方程式如下: (RE_2O_3)+3C?2[RE]_(Sn)+3CO↑ 将纯固态RE_2O_3和纯液态的RE作为标准状态。 所得实验结果如下: 1.在RE_2O_3-CaF_2渣系中RE_2O_3的活度随RE_2O_3浓度的增加而增加。 2.在RE_2O_3-CaO-CaF_2渣系中RE_2O_3的活度随RE_2O_3和CaO浓度的增加而增加。
The activity of RE_2O_3 in both liquid RE_2O_3-CaF_2 and RE_2O_3-CaO-CaF_2 slagsat 1600℃ has been determined by equilibrating the slag with liquid tin in a gra-phite crucible under one atmosphere of carbon monoxide. Pure solid RE_2O_3 andpure liquid RE metals were chosen as the standard states and the equilibrium tem-perature was closely controlled to within ±2℃. The activity of RE_2O_3 in the re-action (RE_2O_3)+3C?2[RE]_(Sn)+3CO↑ was found to increase with the increase ofthe concentration of either RE_2O_3 in the RE_2O_3-CaF_2 system or RE_2O_3 and CaOin the RE_2O_3-CaO-CaF_2 system.
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