RECOVERY OF NICKEL FROM NICKELIFEROUS SULFIDE MATERIAL

摘要

Nickeliferous sulfidic materials containing at least one other metal selected from the group consisting of cobalt, copper and iron are leached with an at least 3N hydrochloric acid solution to produce a pregnant nickel chloride solution. The pregnant nickel chloride solution is treated with a liquid organic extractant to extract the other metals. The nickel chloride raffinate is concentrated with respect to nickel chloride, and the concentrated nickel chloride solution is heated to at least about 750.degree.C. to hydrolyze the nickel chloride to a refined nickel oxide product and a hydrogen chloride-containing gaseous effluent which is recycled to the concentration step and then through water to regenerate the leaching solution.