Abstract
The discovery of elemental sulfur as a principal product in the oxidation of copper sulfides during ammoniacal leaching is relatively new. Reilly and Scott have reported the recovery of up to 60 pct of the sulfur content of synthetic covellite during an ammoniacal leaching study carried out in the presence of an immiscible organic sulfur solvent. Filmer et al. have reported the development of a low temperature oxidative ammonia leach process in which part of the sulfur content of the sulfides (upwards of 76 pct) reports as elemental sulfur and can be recovered from the leach residues by solvent extraction. Prior to this point it was generally believed that elemental sulfur was not formed during an ammoniacal leaching process.
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