碳质高砷硫化物包裹多重难处理金矿热压氧化-氰化试验

Experimenton Hot Pressing Oxidation and Cyaniding of Multiple Refractory Gold Ore Coated with Carboniferous High Arsenic Sulfide

对某碳质高砷硫化物包裹多重难处理金矿进行了以热压氧化—氰化为主体工艺的试验。结果表明:原矿全硫浮选—浮选精矿常规热压氧化—氰化金浸出率仅76.2%,采取了氧化渣脱碳、原矿预脱炭及硫砷分选等措施,均难以提高金回收率。热压氧化渣采用中温焙烧预处理再氰化,可较彻底地消除有机碳的影响,金浸出率达到94.7%,且焙烧过程有害组分砷几乎不会进入气相,焙烧-氰化渣与热压氧化液中和渣混合后的毒性浸出结果满足一般固废要求。

A multi-refractory gold deposit coated with carbon high arsenic sulfide was studied by hot pressing oxidation and cyanidation.The results indicate that the gold leaching recovery of the whole sulfide flotation concentrate is only 76.2%by conventional hot pressurized oxidation-cyanidation process,and the measurements such as decarbonization of hot pressurized oxidation solid product,raw ores pre-carbonization and segmentation flotation of sulfide and arsenic,are all difficult to improve the gold recovery.The effect of organic carbon can be completely eliminated by medium temperature roasting and then cyaniding,the gold leaching rate reaches 94.7%,and the harmful component arsenic hardly enters the gas phase during roasting.The toxic leaching results of the mixture of roasting-cyanidation slag and neutralization slag of hot press oxidation eutralization slag can meet the general requirements of solid waste.