Leaching of sulfidized chalcopyrite with H2SO4-NaCl-O2

摘要: The recovery of copper from chalcopyrite by leaching is complex not only due to the slow dissolution kinetics this mineral in most aqueous media but also production solutions that are heavily contaminated with iron. On contrary, sulfidized very attractive because a faster and more selective compared untreated chalcopyrite. In work, results H2SO4-NaCl-O2 concentrate discussed. Experiments were carried out concentrates previously reacted elemental sulfur at 375 °C for 60 minutes. showed concentration chloride ions below 0.5 M, temperature, time important variables extraction Cu. other hand, Fe was little affected same variables, remaining 6 pct all experimental conditions tested. Microscopic observations leached particles produced reaction does form coherent layer surrounding particle, rather certain locations as large clusters. can be accurately described nonreactive core-shrinking rim topochemical expression spherical 1 − (1 0.45X)1/3=kt. activation energy found 76 kJ/mol range 85 100 °C.