Practical study of liquid-liquid extraction process for separation of rare earth elements with bis(2-ethylhexyl) phosphinic acid.

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概要

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• A separation process for rare earth elements (Pr/Nd and Y/Er) by liquid-liquid extraction with bis(2-ethylhexyl) phosphinic acid is investigated. Extraction equilibrium formulations for these elements are established and extraction constants are determined employing kerosene and toluene as diluents, in which <span style="text-decoration: overline;">MR</span><SUB>3</SUB><span style="text-decoration: overline;">(RH)</span><SUB>3</SUB> is formed at low loading, and then the larger aggregated species, (<span style="text-decoration: overline;">MR</span><SUB>3</SUB>)<SUB>2</SUB>(<span style="text-decoration: overline;">RH</span>)<SUB>4</SUB>, appears with increasing loading ratio. The proposed formulations and constants successfully express the extraction behaviors over the whole range of loading ratio up to 0.4 in single element systems. These are valid for binary element systems of Pr/Nd and Y/Er and also for the distribution behaviors in scrubbing treatment. The separation is enhanced at high pH region, that is, at high loadings. Scrubbing is also effective for separation. Simulation of Pr/Nd separation by continuous counter-current mixer-settler cascades shows that separation is enhanced by employing appropriate pH control and scrubbing treatment.

• The Society of Chemical Engineers, Japanの論文

著者

• Hirai Takayuki

  Department of Chemical Science and Engineering, Graduate School of Engineering Science, Osaka University

関連論文

• Practical study of liquid-liquid extraction process for separation of rare earth elements with bis(2-ethylhexyl) phosphinic acid.

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