Lead, zinc and manganese recovery from aqueous solutions

Details Lead, zinc and manganese recovery from aqueous solutions Lead, zinc and manganese recovery from aqueous solutions

C - Chemistry, Metallurgy

22

B

C22B 3/26 (2006.01) C22B 3/06 (2006.01) C22B 3/38 (2006.01) C22B 3/42 (2006.01) C22B 13/00 (2006.01) C22B 19/20 (2006.01) C22B 47/00 (2006.01) C25C 1/10 (2006.01) C25C 1/16 (2006.01) C25C 1/18 (2006.01)

Patent

CA 2396839

Aqueous solutions containing lead, zinc and manganese are treated to recover these metals by sequential solvent extraction steps. Solvent extractants are selected to extract preferentially lead, then zinc and then manganese in that order. Any interfering metals are removed (as by ion exchange) before extraction. The loaded extractant phases are stripped with selected acids and lead, zinc and manganese each recovered from the strip solutions. Optionally calcium can be recovered when present. A preferred type of extractant (for lead especially) is substituted monothiophosphinic acids. A closed loop system is described which is advantageous with leachate from sulphide and carbonate ores.

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