EXTRACTION MECHANISM OF Sc(III) AND SEPARATION FROM ThUV).Fe(III) AND Lu(III) WITH BIS(2,4,4-TRIMETHYLPENTYL)PHOS- PHINIC ACID IN N-HEXANE FROM SULPHURIC ACID SOLUTIONS |
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| Authors: | Chun Wang Deqian Li |
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| Affiliation: | Laboratory of Rare Earth Chemistry and Physics.Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, 130022, P. R.China |
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| Abstract: | ABSTRACT The extraction equilibrium data of sulphuric acid and scandium(III) with bis(2,4,4-trimethylpenty)phosphinic acid (HBTMPP]) from sulphuric acid solutions have been obtained. There are two extraction mechanisms of scandium(III) with HBTMFP] at different ranges of aqueous acidity. The extraction of Sc(III) proceeds according to a cation exchange reaction at lower aqueous acidity and to a solvating reaction at higher acidity. The practicability of separating Sc(III) from Th(IV),Fe(III) and Lu(II) by controlling the aqueous acidity was discussed. The effect of temperature on extraction of Sc(III) was observed and thermodynamic, functions were caculated. IR and NMR spectra were made for organic extracts. The extraction characteristics of HBTMPP] and di(2-ethylbexyl)phosphinic acid (HDEHP]) were contrasted to obtain more information about extraction with HBTMPP]. |
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