自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 12    December 2016

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Solvent extraction mechanism and precipitation stripping of bismuth (III) in hydrochloric acid medium by tributyl phosphate
WANG Zhi-jian(王志坚), DING Feng-hua(丁风华), ZHAN Jing(湛菁), ZHANG Chuan-fu(张传福)

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:Tributyl phosphate (TBP) was employed for the Bi(III) extraction from hydrochloric acid medium. The effects of extraction time and material concentration were examined. The replacement mechanism between the anion (Cl-) and TBP was proposed for extraction. The results show the species extracted into the organic phase were found to be mainly BiCl3·xTBP (x=2 or 3). Thermodynamic parameters of the extraction reaction were obtained from the thermodynamics analysis, which illustrates that higher temperatures show a negative effect on the extraction. Extraction isotherm was obtained with 2.16 mol/L TBP for a typical solution containing 0.1 mol/L of bismuth and 1.0 mol/L of hydrochloric acid. About 98.5 % of bismuth has been extracted from the leaching solution under the optimum condition. Moreover, oxalate was explored as a precipitation stripping agent for BiCl3·xTBP (x=2 or 3) complexes, by which Bi(III) was stripped in the form of Bi2(C2O4)3·7H2O. A stripping efficiency of 99.3% was obtained in only one stage at the phase ratio of 1 and TBP also could be recycled. Therefore, the method is an efficient, effective and highly selective approach to extract Bi(III) and to recover metal bismuth.

 

Key words: solvent extraction; bismuth (Bi); tributyl phosphate (TBP); precipitation stripping; extraction mechanism

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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