氟碳铈矿-独居石混合精矿分离提取稀土元素

以气态配合物LnAlnCl3n+3(Ln=稀土元素)为载体，研究了从氟碳铈矿-独居石混合精矿中提取分离稀土元素的分步氯化-化学气相传输反应. 精矿经第一步氯化反应分离回收非稀土元素P, Fe和Th后，生成的稀土氯化物在1000℃与配体反应生成气态配合物，并化学传输分离6 h, CaCl2和BaCl2留在残渣中. 研究发现，递减温度场和波浪温度场中的化学传输反应的分离效果不同，在波浪型温度场中的波谷附近稀土沉积量高且分离系数大.

Rare Earth Extraction and Separation from Bastnaesite-Monazite Mixed Concentrate by Chemical Vapor Transport

Vapor phase extraction and separation of rare earth elements from bastnaesite-monazite mixed concentrate were investigated using chlorination and chemical vapor transport reaction mediated by vapor complexes LnAlnCl3n+3(Ln=RE elements). The non-rare earth elements P and Fe and Th were separated from the bastnaesite-monazite mixed concentrate by carbochlorination. At 1000℃ for 6 h, the resulting RE chlorides were chemically transported and separated with the vapor complexes while CaCl2 and BaCl2 remained in the residue. Significantly different CVT separation results were observed between operations with both gradually decreased and wavy temperature mechanisms. The highest transport amount and separation results appeared in the third receptor at a valley temperature.