Liquidus Phase Diagram of CaO-SiO2-La2O3-Nb2O5 System with w(La2O3) = 15 to 25 Pct
Liquidus Phase Diagram of CaO-SiO2-La2O3-Nb2O5 System with w(La2O3) = 15 to 25 Pct
复制标题
CaO-SiO2-La2O3-Nb2O5 体系的液相线相图，其中 w(La2O3)≤=≤15 至 25 Pct
DOI：
10.1007/s11663-020-01818-8
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发表时间：
2020-03
期刊：
影响因子：
--
通讯作者：
Deying Zhu
中科院分区：
文献类型：
--
作者：
Jiyu Qiu;Chengjun Liu;Zhengyue Liu;Deying Zhu
CaO-SiO2-Nb2O5-La2O3体系的热力学信息对矿物中铌和稀土资源的利用具有重要意义。本文通过平衡实验研究了CaO-SiO2-Nb2O5-La2O3体系的相平衡。确定了12种相平衡，构建了空间液相图。分别测定了SiO2、CaNb2O6、LaNbO4、Ca2Nb2O7和CaSi3La4O13的初相场。同时对SiO2、Ca2Nb2O7和LaNbO4的初相场液相面进行了测定。最后，得到了CaO-SiO2-Nb2O5-(17.5, 20,22.5, 25%)La2O3伪三元相图。除了实验结果外，还提出了适用于空间四元相图的两个理论规则，以获得相邻两个初级相场之间二元界面的间接信息。第一个规则是判断相关沉淀反应类型的“切线规则”，第二个规则是判断相关温度趋势的“最高温度规则”。本文的工作将为铌和稀土资源的合理利用和相关热力学数据库的建立提供参考。
The thermodynamic information of the CaO-SiO2-Nb2O5-La2O3 system is of great significance for the utilization of Nb and RE resources from minerals. In this article, the phase equilibria of the CaO-SiO2-Nb2O5-La2O3 system were investigated by equilibrium experiments. Twelve kinds of phase equilibria were determined, and then a spatial liquidus phase diagram was constructed. The primary phase fields of SiO2, CaNb2O6, LaNbO4, Ca2Nb2O7 and CaSi3La4O13 were determined, respectively. Meanwhile, the liquidus surfaces in the primary phase fields of SiO2, Ca2Nb2O7 and LaNbO4 were determined. Finally, the CaO-SiO2-Nb2O5-(17.5, 20, 22.5, 25 pct)La2O3 pseudo-ternary phase diagrams were also obtained. In addition to the experimental results, two theoretical rules applicable for the spatial quaternary phase diagram were also proposed to obtain indirect information on the bivariate interface between two adjacent primary phase fields. The first rule was the “tangent line rule” for judging related precipitation reaction types, and the second rule was the “highest temperature rule” for judging related temperature trends. The present work will be helpful for the utilization of Nb and RE resources and for the establishment of related thermodynamic databases.
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