Separation of cobalt and nickel by non-equilibrium solvent extraction

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.

作 者： WANG Kai-yi NIU Cong-wei QIAN Dong LIU Ju-hong CHEN Xiao-yi LAI De-yong   作者單位： College of Chemistry and Chemical Engineering, Central South University,  刊 名： 中南工業大學學報(英文版)  EI SCI 英文刊名： JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY(ENGLISH EDITION)  年，卷(期)： 2001 8(1)  分類號： O6  關鍵詞：  

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