New information on the chalcopyrite bioleaching mechanism at low and high temperature

摘要: Abstract The chalcopyrite bioleaching mechanism was studied to determine its direct or indirect nature. At the same time, a study of possible causes that diminish dissolution rate and inhibit attack this sulphide mineral carried out. An electrochemical also performed, which included elimination diffusion barriers formed on surface. Results these studies showed oxidation state dissolved iron (Fe3+) fundamental because Fe3+ controlled relative reactions. In addition, by elemental sulphur intermediate, nonstoichiometric, copper sulphides forming surface, are less reactive than original sulphide. Intermediate caused an important barrier effect at low temperature (35 °C). higher (68 °C), intermediate do not constitute due their dissolution. Microbial attachment pyritic phase ore related liberation Fe2+ after pyrite contact bioleaching. It concluded concentrate is cooperative effort involving simultaneous mineral, possibly via thiosulphate, chalcopyrite, probably way polysulphide sulphur.