期刊
HYDROMETALLURGY
卷 100, 期 1-2, 页码 15-19出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hydromet.2009.09.006
关键词
Extraction; Rare earth elements; Sec-nonylphenoxy acetic acid; Bis(2,4,4-trimethylpentyl) dithiophosphinic acid
The extraction of rare earth elements from chloride medium by mixtures of sec-nonylphenoxy acetic acid (CA100) with bis(2,4,4-trimethylpentyl) dithiophosphinic acid (Cyanex301) or bis(2,4,4-trimethylpentyl) monothiophosphinic acid (Cyanex302) in n-heptane has been studied. The synergistic enhancement of the extraction of lanthanum (III) by mixtures of CA100 with Cyanex301 has been investigated using the methods of slope analysis and constant mole. The extracted complex of lanthanum (III) is determined. The logarithm of the equilibrium constant is calculated as - 1.41. The formation constants and the thermodynamic functions, Delta H, Delta G, and Delta S have also been determined. Moreover, the different extraction effects of rare earth elements in the mixing systems of CA100 with Cyanex301 or Cyanex302 have been employed to consider the possibility of separating rare earth elements according to their separation factors. (C) 2009 Elsevier B.V. All rights reserved.
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