Activities of CoS and FeS in copper mattes and the behavior of cobalt in copper smelting |
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Authors: | S N Sinha M Nagamori |
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Affiliation: | (1) Department of Metallurgical Engineering, University of Utah, 84112 Salt Lake City, Utah;(2) Centre de Recherches Minérales, Quebec Government, 2700 Einstein, GIP 3W8 Ste-Foy, Quebec, Canada |
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Abstract: | The distributions of cobalt and iron between metallic copper and high copper mattes were measured at 1400 and 1500 K. A value
of 0.40 ±0.02 was found as the Raoultian activity coefficient of CoS at infinite dilution in the Cu2S-FeS-CoS mattes. The present activities of FeS in the Cu-saturated Cu2S-FeS mattes were found to deviate more positively than those reported by Krivsky and Schuhmann at 1623 K, and the positive
deviation from the Temkin's ideality was greater at 1400 K than at 1500 K. Using the activity coefficient of CoS, the partitions
of cobalt between copper mattes and fayalitic slags were calculated for various conditions of copper smelting. It was found
that cobalt exhibits, in the matte-slag equilibria, chemical properties intermediate between nickel and iron, but much closer
to iron than to nickel. The overall recovery of cobalt in blister copper depends on matte grade, and is as low as 3 pct at
best. When a high cobalt recovery is desired, therefore, a copper concentrate rich in cobalt must not be processed by conventional
pyrometallurgical technology in view of the inevitably high loss to slag.
Formerly Associate Professor, Department of Metallurgical Engineering, University of Utah, Salt Lake City, Utah |
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