In order to recover gold from a complex and refractory gold ore containing carbon, high arsenic and high sulfur, different processing methods including all-slime cyanidation leaching, flotation, roasting and acid leaching were adopted. The results show that sactisfactory recovery of gold can not be achieved via the conventional all-slime cyanidation leaching and flotation processes. Moreover, by using the process of “roasting-all-slime cyanidation leaching”, the gold leaching rate is only 72.25%, due to the influence of the newly generated metal oxides which will encapsulate gold after ore roasting. However, in this study, it has been found that this encapsulated problem can be overcome by acid-dissolving method to pre-treat calcine. Therefore, a combined process of “roasting-acid leaching-water washing-alkali leaching- full-slime cyanidation leaching” has been proposed to recover gold from a complex and refractory gold mines, with a gold leached rate of 88.52%. |