实验测得La_2O_3-Al_2O_3-CaF_2三元渣系不同组成时La_2O_3的活度,并作出等活度图;同时确定该渣系在1600℃下的熔化区域。活度测定所依据的反应为 (La_2O_3)+3C2[La]Sn+3CO↑ 由实验结果得知:当La_2O_3浓度不变时,La_2O_3活度随CaF_2浓度的增加或Al_2O_3浓度的减少而增加;当CaF_2或Al_2O_3浓度不变时,La_2O_3活度都随La_2O_3浓度的增加而增加。
The activity of La_2O_3 in liquid slags of various composition of La_2O_3-Al_2O_3-CaF_2 ternary system has been determined by equilibrating the slag with liquid Sn in a graphite crucible under one atmosphere of CO at 1600℃ in Mo-wire furnace. The iso-activity diagram and the liquid boundary for La_2O_3 at 1600℃ were ascertained. It was resulted that the activity of La_2O_3 increases with the increase of CaF_2 concentration or with the decrease of Al_2O_3 concentration when the La_2O_3 concentration remained constant; and with the increase of La_2O_3 concentration when the concentration of OaF_2 and Al_2O_3 remained constant.
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