Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1977-01-03
1978-04-11
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 53, 423 38, 423 39, 423 94, 423 98, 423494, C01G 3900, C01G 2116
Patent
active
040839214
ABSTRACT:
Copper, iron, and lead impurities are removed from molybdenum flotation concentrates by mixing the feed concentrates with a nonvolatile chloride salt, heating the mixture to a temperature of from about 200.degree. to 350.degree. C for a time sufficient to activate the lead impurities in the concentrates so that they can be leached therefrom during the subsequent leach step, and leaching copper, iron, and lead impurities from the heat-treated concentrates with a mildly oxidizing leach solution containing chloride ions and having a pH of no more than 4. Preferably, the mixing of the chloride salt and the feed concentrates is achieved by thoroughly mixing an aqueous solution of the salt with the feed concentrates. It is advantageous to use an aqueous ferric chloride solution to leach the heat-treated concentrates inasmuch as the lead values leached from the concentrates are readily crystallized from the pregnant leach solution and the resulting spent solution can be recycled without further treatment to be mixed with the feed concentrates, or it can be treated to oxidize ferrous values therein to ferric and then recycled for repeated use as regenerated leach solution.
REFERENCES:
patent: 3117860 (1964-01-01), Bjerkerud et al.
patent: 3674424 (1972-07-01), Stanley et al.
patent: 3694147 (1972-09-01), Drobnick et al.
patent: 3854930 (1974-12-01), Kento
patent: 3911076 (1975-10-01), Probert et al.
Carter Herbert T.
Kennecott Copper Corporation
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