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.