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不同价态的稀土氧化物,在熔盐中的溶解度差异很大。用碳酸盐沉淀工艺可方便地使稀土碳酸盐中的稀土呈三价状态。在1000℃的冰晶石熔体中,Ce_2O_3的溶解度为13.6Wt％,约为CeO_2溶解度的10倍。由碳酸盐工艺制得的三价轻稀土氧化物因其结构疏松,活性大,溶解速度较快,在冰晶石熔体中的溶解度为14.9Wt％。同样条件下,经灼烧而得的其他轻稀土氧化物(RE_xO_y),在熔体中溶解很慢,且其中的CeO_2在渣中被富集。
Different valences of rare earth oxides, solubility in molten salt vary greatly. With carbonate precipitation process can easily make rare earth carbonate rare earth was trivalent state. In 1000 ℃ cryolite melt, Ce 2 O 3 solubility of 13.6Wt%, about 10 times the solubility of CeO 2. Due to its loose structure, large activity and fast dissolution rate, the trivalent light rare earth oxide obtained by the carbonate process has a solubility in the cryolite melt of 14.9 wt%. Under the same conditions, the other light rare earth oxides (RE_xO_y) obtained after burning slowly dissolve in the melt, and the CeO_2 is enriched in the slag.