C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/74
C25C 1/16 (2006.01)
Patent
CA 1260429
ABSTRACT Recovering zinc from zinc bearing ore or con- centrate (1) in an electrolytic cell (3) which includes a cathode (5) containing cathode compartment (16) and an anode (4) containing anode compartment (2). The cathode and anode compartments are defined by interposing between such compartments an ion-selective membrane (6) capable of preventing migration of ionic copper from anode compartment (2) to cathode compartment (16). Process includes forming in anode compartment (2) a slurry of ore or concentrate (1) with a chloride and copper-ion containing solution, intimately mixing oxygen bearing gas (7) with the slurry, maintaining the slurry substantially at atmospheric pressure and at a temperature up to the boiling point of the slurry, and maintaining the pH of the slurry from 1 to 4, whereby zinc passes into solution. At least a portion of the slurry is withdrawn and a zinc and copper rich solution (12) separated therefrom. Fresh zinc bearing ore or concentrate (1) is contacted with solution thereby (12) precipitating ionic copper therefrom. Resultant solution (15) is introduced to the cathode compartment (16) and zinc is electrochemically recovered at the cathode (5).
491522
John Leslie Thompson
Moffat & Co.
LandOfFree
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