Method for recovering zinc

Details Method for recovering zinc Method for recovering zinc

C - Chemistry, Metallurgy

22

B

53/324

C22B 19/20 (2006.01)

Patent

CA 1106620

ABSTRACT OF THE DISCLOSURE A method for recovering zinc from oxidic zinc ores or from calcined-zinc sulphide ore concentrates, or both, the ores or concentrates being leached, and leaching residues thus obtained being subjected to a pyrometallurgical volatilization process. The method comprises the steps of: neutral leaching calcined zinc material so as to produce a leaching residue having a high content of undissolved zinc; drying the leaching residue by bringing the residue into contact with hot gases under reduc- ing conditions and in a state of suspension; volatilizing and precipitating the zinc and remaining volatile metal compounds in the form of metal oxides; and finally subjecting the mixed oxides to neutral leaching.

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