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Separation of cobalt and nickel by non-equilibrium solvent extraction

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Abstract

The separation of cobalt and nickel in the ammoniacal sulfate solution by non-equilibrium solvent extraction with a phosphate (P303) as extractant was studied. In the experiment, the effects of equilibrium pH value in aqueous phase, contact time of the two phases, the air-blowing time for feed liquor in the open beaker on percentage extraction of cobalt and nickel and percentage reextraction of nickel from the loaded organic phase with dilute H2SO4. etc were studied. The results showed that: Co(II) can be oxidized to Co(III)-ammino-complex by adding (NH4)2S2O8 or blowing air to the aqueous phase, and Co(III)-ammino-complex is a kind of kinetically inert complex. Its extractive speed is very slow, while the nickel’s is much faster than that of cobalt. By controlling the contact time of the two phases, nickel can be separated from cobalt by non-equilibrium solvent extraction. Then nickel was reextracted from the loaded organic phase with dilute H2SO4.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Central South University, 410083, Changsha, China

    Wang Kai-yi, Niu Cong-wei, Qian Dong, Liu Ju-hong, Chen Xiao-yi & Lai De-yong

Authors
  1. Wang Kai-yi
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  2. Niu Cong-wei
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  3. Qian Dong
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  4. Liu Ju-hong
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  5. Chen Xiao-yi
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  6. Lai De-yong
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Additional information

Foundation item: The Natural Science Foundation of Hunan Province (No.99JJY20010)

Biography of the first author: WANG Kai-yi, professor, born in 1938, majoring in applied chemistry.

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Wang, Ky., Niu, Cw., Qian, D. et al. Separation of cobalt and nickel by non-equilibrium solvent extraction. J Cent. South Univ. Technol. 8, 50–53 (2001). https://doi.org/10.1007/s11771-001-0024-5

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  • DOI: https://doi.org/10.1007/s11771-001-0024-5

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