C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/279, 53/300
C22B 5/02 (2006.01) C22B 7/04 (2006.01) C22B 15/00 (2006.01) C22B 23/02 (2006.01)
Patent
CA 1088757
ABSTRACT OF THE DISCLOSURE A process for recovering nickel and nickel- copper from molten smelter-type slags or other highly oxidized sources of nickel and nickel-copper containing magnetite (Fe3O4) comprises reducing the magnetite in the slag with carbonaceous materials or other solid reductants which are mixed into the slag by a fluid- cooled, metal-bladed mechanical stirrer. As a result of stirring the reductant into the slag, the rate of magnetite reduction is highly accelerated and the nickel or nickel-copper (as well as cobalt, if present) separates into a phase as either immiscible metal, a sulfide, or a nickel-copper-iron-sulfide matte, depending upon the initial composition of the slag. A process for the combined smelting and slag cleaning of nickel-copper concentrates is also disclosed. In this process, slag from the converter which would otherwise be returned to the smelting stage is treated in a separate reduction stage in accordance with the above procedure to recover the metal values such as copper, nickel and cobalt therefrom. With this process no slag is returned to the smelter. In another embodiment of the invention, smelting and converting are combined in a single stage in which a copper-nickel concentrate is burned and melted. The result is a copper alloy and a slag containing copper and nickel, which are recovered in accordance with the above-described procedure.
268432
Ammann Paul R.
Kim Jonathan J.
Kennecott Copper Corporation
Kirby Eades Gale Baker
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