Process for producing cobalt powder
AssigneeGTE Products Corporation
InventorsJoseph E. Ritsko, John J. Culkin, Martin B. MacInnis, Howard L. Acla
Life of this patent
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Abstract
Cobalt is recovered from by-product streams from a basic process by heating the by-product streams containing ammonia for a sufficient period of time at a pH of about 8 to about 10 to produce an ammonia enriched vapor and an aqueous mixture comprising a solution substantially free of ammonia and another cobalt containing precipitate. The basic process is the type wherein cobalt ions in solution are complexed with ammonia in the presence of halide ions to form an ammine halide solution which is digested to form a cobalt containing precipitate. The precipitate is subsequently reduced to form a cobalt metal powder.
Claims9
A process for producing cobalt metal powder, the basic process comprising the steps of forming cobalt ions in solution, complexing said cobalt ions with ammonia in the presence of halide ions to form a cobalt ammine halide solution, digesting said cobalt ammine halide solution in the presence of ammonia to form a cobalt containing precipitate, separating said cobalt containing precipitate from the resulting solution, and heating cobalt containing precipitate in a reducing atmosphere to obtain a cobalt metal powder wherein the improvement comprises heating the resulting solution at a pH from about 7.5 to 14 at a sufficient temperature for a sufficient period of time to produce an ammonia enriched vapor and an aqueous mixture comprising a solution substantially free of ammonia and another cobalt containing precipitate.
Dependencies are inferred from the claim text.