C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/304, 18/500.3
C22B 23/00 (2006.01) C22B 1/00 (2006.01) C22B 3/08 (2006.01) C22B 23/02 (2006.01)
Patent
CA 1055711
METHOD OF ENHANCING THE ATMOSPHERIC LEACHING OF NICKELIFEROUS MATTE Abstract of Disclosure A method is disclosed for preparing matte for the atmospheric acid leaching thereof. Such mattes include nickeli- ferous sulfide mattes (e.g. nickel sulfide and nickel-copper sulfide mattes) containing 30% to 75% nickel, up to about 50% copper, up to about 10% Co, 4% to 25% sulfur and up to about 5% iron, the nickel (cobalt), copper and sulfur content making up at least about 90% by weight of the matte. The amount of sul- fur contained in the matte is less than that required stoichio- metrically to combine with the metal values therein and does not substantially exceed that amount required to combine with nickel as Ni3S2. The method resides in establishing a bath of said molten matte of predetermined composition, the temperature of the molten matte being at least about 100°C higher than its liquidus-solidus temperature, following which the temperature of the molten matte is lowered to a granulating temperature rela- tive to said liquidus-solidus temperature so that the granulating temperature falls within the range of about 50°C above and about 100°C below said liquidus-solidus temperature. The mol- ten matte is thereafter quenched in the presence of a quenching fluid from said granulating temperature, and then comminuted to the desired size for leaching, thus providing a feed pro- duct characterized by improved dissolution characteristics with respect to the nickel therein when subjected to atmospheric leaching in a hot acid solution. -2-
233946
Buker Donald O.
Ronzio Richard A.
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