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- W2777131824 abstract "A dry process for the separation of rare earths has been investigated using a chemical vapor transport reaction mediated by metal halide vapor complexes KRCl4(g) and RAnCl3+3n(g) (R = rare earths), in which KCl and AlCl3 act as complex formers, i.e. transporting agents. Rare earth concentrates of monazite and xenotime were used as raw materials as well as the crude oxides originating from monazite, bastnasite and ionic ores. The concentrates and crude oxides were chlorinated by Cl2 gas at 1000°C. The resulting RCl3 reacts with the complex formers KCl and AlCl3 and was extracted as the vapor complexes, which selectively decompose along a well-controlled temperature gradient to give the RCl3. Heavier rare earth chlorides including YCl3 were generally more readily transported and concentrated in the deposit at temperatures around 600–700°C, and lighter ones in higher temperature fractions at 800–900°C. Chlorides of other elements such as Th, U and P in the raw materials were generally concentrated in lower temperature fractions. Yields of individual rare earths after reaction for 82 h increased with increasing atomic number or decreasing ionic radius of the rare earth ion: 20%–30% for La; 50%–60% for Ce; 60%–70% for Pr and Nd; >80% for Gd-Lu and Y." @default.
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- W2777131824 date "1996-01-01" @default.
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- W2777131824 title "Extraction and mutual separation of rare earths from concentrates and crude oxides using chemical vapor transport" @default.
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- W2777131824 doi "https://doi.org/10.1016/0925-8388(96)80040-5" @default.
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