Abstract
The leaching of molybdenite and copper sulphides with solutions of hypochlorite has been studied. The roles of pH and additions of carbonate ion in controlling molybdenum extraction and hypochlorite decomposition are described. The presence of carbonate ions during leaching prevents loss of molybdenum through precipitation as calcium molybdate. Carbonate ions while increasing copper extraction appear to act as stabilizers for the hypochlorite by delaying the onset of precipitation of catalytically active copper compounds. The leaching of molybdenite-containing copper sulphide rougher concentrates, it is concluded, is best performed at pH 9 with a carbonate-containing hypochlorite solution. Theoretical consideration is given to the possible influence of cadmium, zinc and lead ions on molybdenum extraction during the leach.
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