Extraction of scandium by liquid di-2-ethylhexylphosphoric acid in fusible diluents
Abstract
Currently widespread distribution of extraction methods using fusible reagents can be explained by a number of advantages, such as high kinetic characteristics of the process, the ease separation of two phases, high selectivity of many extractants, relatively complete regeneration.
For the extraction of scandium in technological order, neutral and cation exchange extractants can be used. Several extraction reagents melt easily at high temperatures, and such melts can be used for extraction. Efficiency of the extraction of metal by cation reagents depends on many factors. Extraction of scandium by melt mixtures of di-2-ethylhexylphosphoric acid - higher carboxylic acid - paraffin and the effect of acidity of the aqueous phase, the concentration of scandium and the aqueous extractant in the organic phase, the volume ratio of organic and aqueous phases on the extraction of metal were studied.
It was found that the extraction of scandium proceeds through the cation exchange mechanism. Scandium was extracted quantitatively (> 99.0%) from acid solutions. The optimal concentration of di-2-ethylhexylphosphoric acid in the extractant was 0,250 M, quantitative extraction of scandium was observed in the range of its concentrations of 10-3-10-6 M and the volume ratio of organic phases to aqueous phases of 1:5 - 1:20.
References
1 Komissarova LN (2001) Inorganic and analytical chemistry of scandium [Neorganicheskaya i analiticheskaya khimiya skandiya]. Editorial URSS, Moscow, Russia. (In Russian) ISBN 5-8360-0316-5
2 Zelikman AN, Korshunov BG (1991) Metallurgy of Rare Metals [Metallurgiya redkikh metallov]. Metallurgiya, Moscow, Russia. (In Russian) ISBN 5-229-00743-5
3 Sokolova YV, Koryakov VB, Perkov PG (2004) Universities Bulletin. Non-ferrous metallurgy [Izvestiya vuzov. Tsvetnaya metallurgiya] 4:30-36. (In Russian)
4 Gadzhiyeva SR, Aliyeva TI, Chiragov FM (2005) Bulletin of Baku State University. Natural Sciences Series [Vestnik Bakinskogo Universiteta. Seriya estestvennykh nauk] 2:49-54. (In Russian)
5 Kostikova GV, Krylov YS (1994) Distribution of scandium in extraction by D2EHPA with different additions of chloride and nitrate media [Raspredeleniye skandiya pri ekstraktsiy D2EGFK s razlichnymi dobavkami iz khlopidnykh i nitratnykh sred]. Proceedings of the conference on extraction: RAS Institute of Physical Chemistry [Materialy konferentsii po ekstraktsii: Institut Fizicheskoy Khimii RAN], Moscow, Russia. P.137. (In Russian)
6 Garagonich VV, Chundak SY, Kubarich LM (2002) Study of the complex formation and extraction of yttrium and scandium [Issledovaniye kompleksoobrazovaniya i ekstraktsii ittriya i skandiya]. Proceedings of All-Russian conference “Topical issues of analytical chemistry”, Vol.2 [Tezisy dokladov Vserossiyskoy konferentsii «Aktual'nyye problemy analiticheskoy khimii», Tom 2], Moscow, Russia. P.17. (In Russian)
7 Petrova VA, Palant AA (1995) Russ J Inorg Chem+ 40:1225-1228. (In Russian)
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