Journal
HYDROMETALLURGY
Volume 154, Issue -, Pages 129-136Publisher
ELSEVIER
DOI: 10.1016/j.hydromet.2015.04.001
Keywords
Nonsymmetric dialkylphosphinic acid; Synthesis; Extraction-separation performance; Heavy rare earths
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Funding
- National Basic Research Program of China [2012CBA01201]
- National Nature Science Foundation of China [21301104]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13026]
- National Science Foundation for Post-doctoral Scientists of China [2012M510433]
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The extraction and separation of heavy rare earths is always one of the most challenging unit operations in hydrometallurgy. Research and development of novel efficient extractant is one way to solve this problem. Organophosphinic acid is a good potential extractant A new method was established for the synthesis of nonsymmetric dialkylphosphinic acid (NSDAPA) (R'R '' POOH, R' not equal R ''), optimized the synthesizing conditions of the key intermediate mono-alkylphosphinic acid and successfully synthesized three novel extractants (n-octyl)(2,4,4'-trimethylpentyl) phosphinic acid, (n-octyl)(cyclohexyl)phosphinic acid and (2,3-dimethylbutyl) (2,4,4'-trimethylpentyl)phosphinic acid. The extraction ability of the novel extractants was investigated. The structure-property relationship and the separation performance for heavy rare earth couples Er/Y, Y/Ho, Yb/Tm and Lu/Yb were evaluated. (C) 2015 Elsevier B.V. All rights reserved.
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