C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/328
C22B 3/08 (2006.01) B03B 9/00 (2006.01) C22B 1/02 (2006.01) C22B 15/00 (2006.01) C22B 19/02 (2006.01)
Patent
CA 1328353
ROGERS, BERESKIN & PARR TITLE: RECOVERY OF ZINC FROM ZINC BEARING SULPHIDIC ORES AND CONCENTRATES BY CONTROLLED OXIDATION ROASTING INVENTORS: MURRY C. ROBINSON DONALD W. KIRK DR. BRUCE JUE ABSTRACT OF THE DISCLOSURE A process is described for the controlled oxidation roasting of zinc bearing sulphidic ores and concentrates by adjusting the furnace temperature and residence time together with the oxygen availability to the sulphide reten- tion requirements in the calcine. The obtained calcine is subsequently subjected to various physical and chemical pro- cess steps to separate the unreacted sulphides which are then dead roasted and treated for zinc recovery, according to one embodiment of the process. In another embodiment the separated, unreacted sulphides are returned to the control- led oxidation roasting step. The chemical separation process steps include sulphur dioxide leaching. In one embodiment zinc is prefer- -2- entially dissolved as sulphite and the solution obtained is further treated for zinc recovery. In other embodiments sulphuric acid, or ammonical ammonium carbonate or similar leaching reagents are used for the preferential dissolution of the zinc oxide present in the calcine.
504314
Jue Bruce
Kirk Donald W.
Robinson Murry C.
Bereskin & Parr
Materials-Concepts-Research Limited
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