C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/117
C22B 1/06 (2006.01) C22B 23/00 (2006.01) C22B 47/00 (2006.01)
Patent
CA 1098713
ABSTRACT OF THE DISCLOSURE Selective sulfation process for quantitatively converting non-ferrous metals chosen from the group con- sisting of copper, nickel, cobalt, vanadium, and manganese in an ore concentrate to soluble sulfates and simultaneously converting the ferrous values in the ore to insoluble oxides. The process comprises roasting finely divided ore particles at a temperature in excess of 650° C in the presence of a roaster gas comprising at least a stoichio- metric amount of oxygen and at least 1% SO2. The roasting is performed in the presence of a sufficient amount of a mixture of salts to allow the formation of a liquid coat- ing on the ore particles. In a preferred embodiment, the mixed salt which forms the liquid coating comprises Na2SO4 and K2SO4 with the ratio of sodium to potassium being between 1.0 and 2Ø
270678
Kennecott Copper Corporation
Kirby Eades Gale Baker
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