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Solvent extraction mechanism and precipitation stripping of bismuth (III) in hydrochloric acid medium by tributyl phosphate

  • Materials, Metallurgy, Chemical and Environmental Engineering
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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.

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Authors and Affiliations

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

    Zhi-jian Wang  (王志坚), Feng-hua Ding  (丁风华), Jing Zhan  (湛菁) & Chuan-fu Zhang  (张传福)

Authors
  1. Zhi-jian Wang  (王志坚)
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  2. Feng-hua Ding  (丁风华)
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  3. Jing Zhan  (湛菁)
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  4. Chuan-fu Zhang  (张传福)
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Corresponding author

Correspondence to Jing Zhan  (湛菁).

Additional information

Foundation item: Project(2011AA061002) supported by the High-Tech Research and Development Program of China; Project(2010SK2010) supported by the Key Program of Science and Technology of Hunan Province, China; Project supported by the Hunan Nonferrous Metals Fund, China

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Wang, Zj., Ding, Fh., Zhan, J. et al. Solvent extraction mechanism and precipitation stripping of bismuth (III) in hydrochloric acid medium by tributyl phosphate. J. Cent. South Univ. 23, 3085–3091 (2016). https://doi.org/10.1007/s11771-016-3373-9

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  • DOI: https://doi.org/10.1007/s11771-016-3373-9

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