Method to control manganese in zinc leach circuits

Details Method to control manganese in zinc leach circuits Method to control manganese in zinc leach circuits

C - Chemistry, Metallurgy

22

B

C22B 19/20 (2006.01) C01G 45/02 (2006.01) C22B 3/44 (2006.01)

Patent

CA 2394631

A method and apparatus for precipitating manganese from acidic sulfate solutions, and more specifically from zinc leach solutions, without removing zinc. A zinc- and manganese-containing solution is treated with an SO2-O2 gas mixture at the appropriate pH and temperature, thereby causing manganese to precipitate as a trivalent and/or tetravalent manganese hydroxides and/or oxides that report to the leach residue or are removed separately from solution by solid/liquid separation. These trivalent and/or tetravalent manganese compounds may be used as oxidants in other parts of the leach circuit.

L'invention concerne un procédé et un appareil pour assurer la précipitation du manganèse à partir de solutions de sulfate acide, et plus particulièrement, de solutions de lixiviation du zinc, sans retirer ce dernier. Une solution contenant du zinc et du manganèse est traitée à l'aide d'un mélange de gaz SO2-O2, à la valeur de pH et à la température requises, ce qui provoque la précipitation du manganèse sous forme d'hydroxides de manganèse tétravalent et/ou trivalent, et/ou d'oxydes qui se rapportent au résidu de lixiviation ou sont séparément retirés de la solution par une séparation solide/liqude. Ces composés trivalents et/ou tétravalents peuvent être utilisés comme des oxydants dans d'autres parties du circuit de lixiviation.

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