Membrane Solvent Extraction of Some Rare Earth Elements

A. G. Gaikwad, K. R. Chitra, G. D. Surender and A. D. Damodaran

Abstract
Studies on the membrane solvent extraction consisting of source and membrane, and membrane and receiving phases in extraction and stripping processes of praseodymium, samarium and yttrium in hollow fiber membrane one after the other, have been investigated. Different experimental variables, such as the pH, carrier, metal ion and stripping agent concentrations have been explored. However, the solvent and membrane solvent extraction methods were compared based on the equilibrium extraction constant. The pre-concentration by the ion transport based on enrichment factor (EF) with the consideration of controlled parameters, were predicted. The ion transport of praseodymium, samarium and yttrium in the receiving or membrane phase envisages the determination of extraction equilibrium constant for these elements.

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Keywords
membrane, extraction, stripping, praseodymium, samarium, yttrium