Roasting Practices at International Nickel

THE copper-nickel sulfide ore deposits of the International Nickel Company of Canada, Limited, contain the minerais pyrrhotite, pentlandite, and chalcopyrite. In the extraction of the nickel, copper, and iron, much of the processing involves oxidation of the metals as well as sulfur. Roasting plays a predominant role at several stages in the operations which prepare the constituent metals for refining. Copper, nickel and iron concentrates of various grades, ranging from low-grade nickeliferous pyrrhotite to highgrade nickel sulfide, must be partially or completely oxidized. Figure 1 shows the main points at which roasting is conducted at INCO.
Keywords: Calcine, Concentrate, Concentrates, electrostatic precipitator, magnetite, Nickel Oxide, pentlandite, pyrrhotite, Fluids, Iron, nickel, pyrrhotite, Roasters, Roasting, Temperature
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