Selective Separation of Rare Earth Metals by Integrated Extraction and Crystallization
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United States of America Patent
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Dec 4, 2014
app pub date -
May 8, 2014
filing date -
May 30, 2013
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Abstract
An integrated recovery process for rare earth recovery includes bringing the acid solution containing rare earth elements into contact with an organic phase containing an extraction agent to extract the rare earth elements into the organic phase. The organic phase is separated from the aqueous phase. The rare earth elements are either collected from the aqueous phase of the extraction process or the rare earth elements are stripped from the organic phase to an aqueous solution. Rare earth powders are collected from the aqueous solution by partly removing the aqueous solvent. Alternatively, the aqueous solvent can be completely removed, the collected rare earth powders are dissolved in an acidic solution, and the mixture is equilibrated for crystallization of the target rare earth element. In both cases, the crystals and a mother liquor are separated by solid/liquid separation.
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