从氰化尾渣中提取S、Fe、Au的方法

Method for extracting S、Fe and Au from cyanidation slag

河南地区可再回收利用的氰化尾渣资源丰富,一般含金品位3g/t左右。对这类氰化尾渣首先采用沉降分离法,富集含金黄铁矿;含金黄铁矿经封闭式焙烧炉焙烧,使金充分裸露,产出硫气体经冷却生成硫磺,焙砂金品位进一步提高;焙砂经充空气搅拌水浸后,压滤固液分离,滤液蒸发烘干后为FeSO4产品;固体用常规氰化法浸金。该方法简单易行,方便快捷。试验结果表明,可使氰化尾渣中金的回收率达72.95%～91.91%。

There are abundant cyanidation slag resources in Henan province, and the grade of gold is about 3 g/t. With settlement separation method, the auriferous pyrite is enriched. After roasted by close roaster, gold in pyrite is sufficlently exposed, the yielding sulfur gas is cooled as sulphur and the gold grade of the roasted mass is even higher. After filling oxygen and water-logging, the solid and liquid is separated with pressure filtration process and the filtrate is dried for FeSO4 product. The solid product is leached for gold with ordinary cyanidation process. The recovery rate of Au is 72. 95 ~91.91%. And the method is convenient and easy to be carried out.