Abstract This paper reports on the experimental investigation of the phase relations in the CaO-SiO2-Dy2O3 system. CaO-SiO2-Dy2O3 slags were equilibrated at 1773 and 1873 K for 86400 s in Ar and then quenched in water to determine the phase relations of the system. The composition of the equilibrated phases was measured by EPMA-WDS and XRD. The presence of ternary compounds and the solid solution and liquid regions were determined to construct the isothermal sections at 1773 and 1873 K of the ternary phase diagram. The data from this work will support further investigations on the feasibility to recover REEs through pyrometallurgical processing.

中文翻译：

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SiO2-Dy2O3-CaO三元体系中相关系的实验研究

摘要 本文报道了CaO-SiO2-Dy2O3 体系中相关系的实验研究。CaO-SiO2-Dy2O3 渣在 1773 和 1873 K 下在 Ar 中平衡 86400 秒，然后在水中淬火以确定系统的相关系。通过EPMA-WDS和XRD测量平衡相的组成。确定三元化合物的存在以及固溶体和液体区域以构建三元相图的 1773 和 1873 K 处的等温截面。这项工作的数据将支持进一步研究通过火法冶金处理回收 REE 的可行性。