Abstract
Results of a preliminary study of the ammoniacal leaching of synthetic covellite (CuS) in an aqueous oxidizing system in the presence of a nonmiscible organic sulfur solvent are described. Up to 60 pct of the sulfur can be recovered from the solvent as elemental sulfur while achieving high degrees of solubilization of the mineral. The effects of temperature, particle size, oxygen pressure, ammonia concentration and ammonium ion concentration on the degree of sulfur recovery were investigated. Maximum recoveries were achieved at moderate temperatures and in well-buffered systems, with a large excess of ammonia. Oxygen pressure and particle size were found to have little effect on fractional recovery of sulfur.
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