Abstract
AbstractThe raw anode slimes from the copper refinery of the CCR Division of Noranda Minerals Inc. consist principally of AgCuSe, (Ag,Cu)2Se, PbSO4, BaSO4, CuSO4·5H2O and an oxidate matrix phase which agglomerates the slimes particles. The principal silver carriers are the selenides; minor amounts of Ag occur in the copper sulphate, in the oxidate matrix phase and as tiny inclusions of Ag-Sb chloride in CuSO4. Only traces of silver powder are present. The dominant tellurium carrier is the selenide phase in which Te replaces Se; minor amounts of Te also are present in the oxidate matrix phase. During O2-H2SO4 pressure leaching at 180°C, significant amounts of Cu, Ni, Ag, Se and Te are solubilized with the subsequent formation of Ag2SO4, Ag2Se and a silver-rich oxidate matrix phase different in composition from that in the raw anode slimes. Most of the Te reports as tellurate or tellurite in the oxidate matrix phase although minor amounts remain in solid solution in the Ag2Se. Oxygen pressure leaching of th...
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