OPTIMISATION OF ROASTING OF ARSENIC- CARBON REFRACTORY GOLD ORES FOR CYANIDE

To optimize the technology for Bakyrchik deposit gold ore processing according to roasting- cyani-dation pattern, the researches on sorption properties and the influence of carbon-bearing minerals content in calcine on gold recovery have been carried out. The results of conducted investigations showed that sorption properties of coal- Au concentrate during roasting process change even at rela-tively high residual carbon content in the calcine. Chemical sorption, dominating in gold-bearing so-lutions contact with coal concentrate, changes into physical sorption after its roasting. Roasting was applied in order to liberate noble metals, to produce the calcine with porous structure, unaffected by processes of surface melting and sintering. key words: carbon-bearing minerals, sorption, gold recovery, roasting-cyanidation process, carbo