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| DETERMINATION OF THE ACTIVITY OF RE_2O_3 IN LIQUID RE_2O_3-CaF_2 AND RE_2O_3-CaO-CaF_2 SLAGS |
| Wang Changzhen;Yang Daiyin North-Eastern Institute of Technology |
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Cite this article:
Wang Changzhen;Yang Daiyin North-Eastern Institute of Technology. DETERMINATION OF THE ACTIVITY OF RE_2O_3 IN LIQUID RE_2O_3-CaF_2 AND RE_2O_3-CaO-CaF_2 SLAGS. Acta Metall Sin, 1979, 15(3): 433-437.
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Abstract 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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Received: 18 March 1979
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