00000nam 2200000za 4500 9.841340 CaOODSP 20221107152049 cr ||||||||||| 170809s1969 oncd ob f000 0 eng d CaOODSP eng eng fre n-cn--- n-cn-on M34-20/113E-PDF M34-20/113 Ritcey, G. M. Stagewise separation of uranium, thorium and the rare earths by liquid-liquid extraction [electronic resource] / G.M. Ritcey and B.H. Lucas, Extraction Metallurgy Division. Ottawa : Queen's Printer, [1969] iv, 30 p. : charts Technical bulletin ; TB 113 Cover title. "September 1969." Digitized edition from print [produced by Natural Resources Canada]. Includes bibliographical references (p. 14-17). “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. Includes abstract in French. gccst Metals gccst Processing Lucas, B. H. Canada. Natural Resources Canada. Canada. Mines Branch. Technical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch) TB 113 (CaOODSP)9.834857 PDF 1.69 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-113-eng.pdf 299999