硫化矿物中的微细金包体一般不能用普通氰化法回收。金矿石必须经预先处理,使与金结合的硫化矿物氧化,并除去对氰化浸出过程有影响的其它矿物和化合物。为此,研究了焙烧预处理工艺,在焙烧后从难选的含硫和碳的矿石中回收金。通入含氧气体(如空气或富氧空气),在高温(400～800℃) Sulfur minerals in the fine gold inclusions generally can not be recovered by ordinary cyanidation. Gold ore must be pre-treated to oxidize the gold-bound sulfide minerals and to remove other minerals and compounds that have an impact on the cyanide leaching process. To this end, the roasting pretreatment process has been studied, recovering gold from refractory sulfur and carbon containing ores after firing. Into the oxygen-containing gas (such as air or oxygen-enriched air), at high temperature (400 ~ 800 ℃)