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- W127108509 abstract "Studies were carried out on a 0.4 N di-2-ethylhexylphosphoric acid (HDEHP) solution in kerosene containing 4 g/l scandium oxide. The organic phase was contacted with solid sodium fiuoride during continuous agitation over a period of 1 hr. The precipitate was separated from the organic phase by filtration, and analyzed for its scandium content after washing with kerosene to remove traces of HDEHP. At a 6: 1 mol ratio of fluoride to scandium ions only 23% of the scandium was back-extracted from the HDEHP solution; this value increased to 31% back-extraction of scandium at a 12: 1 mol ratio of F to Sc, and rose to 98% Sc back-extraction at a 36: 1 mol ratio of F to Sc. X-ray analysis of the precipitates showed that ScF/sub 3/ forms at a 6: 1 ratio of F to Sc; some NaScF/sub 4/ forms at a 12 : 1 ratio of F to Sc, while the sodium hexafluoride Na/ sub 3/ScF/sub 6/ is formed at a 36 : 1 mol ratio of F to Sc. Thus a large excess of sodium fl uoride with formntion of Na/sub 3/ScF/sub 6/ is necessary for complete back-extraction of scandium to form a 0.4 N HDEHP inmore » kerosene. (SJR)« less" @default.
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- W127108509 date "1974-01-01" @default.
- W127108509 modified "2023-09-27" @default.
- W127108509 title "Mechanism and conditions of back-extraction of scandium from di-2- ethylhexylphosphoric acid" @default.
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