用石墨为还原剂,将渣中La_2O_3还原入液态Sn,以测定1500℃下La_2O_3-CaF_2和La_2O_3-CaF_2-CaO-SiO_2渣中La_2O_3的活度.对La_2O_3-CaF_2系,并用Gibbs-Duhem积分法求得CaF_2的活度. 根据液态渣的离子结构模型,对上述二渣系中La_2O_3的活度数据进行了简单的讨论.
The activity of La_2O_3 in liquid La_2O_3-CaF_2 and La_2O_3-CaF_2-CaO-SiO_2 slagshas been determined at 1500℃ y equilibrating the slags with liquid tin in agraphite crucible under one atmosphere of carbon monoxide. From the ctivitydata on the La_2O_3-CaF_2 system, the activity of CaF_2 has been obtained by Gibbs-Duhem integration. The activity ata on the above mentioned slags are briefly discussed on thebasis of ionic constitution of liquid slags.
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