C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/370
C22B 3/00 (2006.01) C01B 17/06 (2006.01) C22B 3/06 (2006.01)
Patent
CA 1066062
Abstract of the Disclosure This invention relates to a method of recovering one or more metal values of the group consisting of copper, silver, nickel, cobalt ant zinc from a sulfur an iron containing ore of the metal or metals. The method consists of intermixing the ore and at least a stoichiometric amount of nitric acid of about 30-50% by volume concentration to form an aqueous acid leach solution of the same. The solution is heated to a temperature at or above the melting point of sulfur while the solution is contained under pressure in a relatively inert atmosphere. The temperature of the solution is controlled to substantially solubilize the sulfur and the metal value or values in the acid soluble phase of the solution while substantially insolu- bilizing the iron values with respect thereto. The iron values are separated from the acid soluble phase of the solution, and the metal value or values recovered from the acid soluble phase. This process allows the metals to be solvent extracted from the liquor without the problem of lasting precipitates forming in the liquor and fouling the extraction process.
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