Zinc recovery process

Details Zinc recovery process Zinc recovery process

2002-09-12

2008-12-16

King, Roy (Department: 1793)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C423S101000, C423S109000, C205S606000

Reexamination Certificate

active

07465334

ABSTRACT:
A process for the recovery of zinc metal from a zinc mineral includes the steps of leaching the zinc mineral in a solution including a halide species formed from two or more different halides, to leach the zinc into the solution. The zinc-bearing solution is then electrolyzed to yield zinc metal and to generate the halide species. The electrolyzed solution including the halide species is then returned to the leaching step. A portion of the electrolyzed solution can be removed as a bleed stream from a cathode compartment of an electrolytic cell of the electrolysis process and processed to remove manganese as manganese dioxide precipitate by adding thereto limestone, and the halide species from an anode compartment of the electrolysis process. In this regard, the pH and Eh of the solution can regulated in a manner that favors the formation of the manganese dioxide precipitate over the formation of a precipitate of zinc.

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Krishnamurti et al., “Influence of Manganese oxide minerals on the formation of iron oxides”, Clays and Clay Minerals, vol. 36, No. 5 467-475, 1988.

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