Stagewise separation of uranium, thorium and the rare earths by liquid-liquid extraction / G.M. Ritcey and B.H. Lucas, Extraction Metallurgy Division.: M34-20/113E-PDF

“Rare earths and thorium are found associated with uranium at Elliot Lake, Ontario, one of the major uranium-producing areas of Canada. In addition to the recovery of uranium by ion exchange processing, minor quantities of thorium and rare earths are recovered as bulk concentrates. The work described shows the development of a stagewise separation of individual rare earths by liquid-liquid extraction from sulphuric acid barren liquors from the uranium recovery circuit. This is accomplished by the use of an alkylphosphoric acid dissolved in a kerosene diluent. Residual uranium and thorium are co-extracted with an amine, prior to rare-earth processing. The bench-scale results have indicated that extraction coefficients of individual rare earths, and separation factors between rare earths, are affected by the aqueous feed pH, solvent concentration, and the atomic number of the rare earth. The data presented show the possibility of selective separation of the rare earths singly or in small groups. A proposed flowsheet is given"--Abstract, p. i.

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