含碳微细粒难处理复杂金矿选矿试验研究

针对某含碳超显微包裹体难浸金矿石,分别开展了常规氰化浸出探索试验、优先浮碳再细磨浮金探索试验、细磨焙烧预处理再氰化提金探索试验。试验结果表明,采用常规氰化时金的浸出率仅为14.01%,即使进行脱碳处理后,金浮选的回收率也仅达到51.82%。该类型矿石若要解决受含碳和包裹金影响的问题,有效的途径之一就是进行焙烧预处理。矿石经细磨后,采用“焙烧-水洗-碱浸-氰化”的工艺流程,金的浸出率可达87.57%,从而使金得到了较好的回收。

Experimental study on gold mineral processing of carbon-bearing ultramicroscopic inclusions

For a difficult-to-leaching gold ore containing carbon-containing ultra-microscopic inclusions, the conventional cyanide leaching exploratory experiment, the exploratory experiment of preferential carbon floating and then fine grinding float gold, and the exploratory experiment of fine grinding roasting pretreatment and cyanidation gold extraction were carried out respectively. The test results show that the gold leaching rate when using conventional cyanidation is only 14.01%, and even after the decarburization treatment, the gold flotation recovery rate is only 51.82%. If this type of ore is to solve the problem of carbon-containing and coated gold, one of the effective ways is to carry out roasting pretreatment. After the ore is finely ground, the process flow of "roasting-washing-alkali leaching-cyanidation" is adopted, and the leaching rate of gold can reach 87.57%, so that the gold is better recovered.