含铜难处理金精矿焙烧—酸浸—氰化提金工艺研究

Roasting-acid Leaching-cyanidation of Refractory Gold Concentrate Containing Copper

针对某含铜难处理金精矿,研究了焙烧—酸浸—氰化提金工艺,获得了优化工艺条件。结果表明,在焙烧温度为540℃,焙烧时间2 h,焙砂在初酸浓度为30 g/L、液固比3∶1,浸出温度90℃,浸出时间1.5 h的条件下,Cu浸出率>95%,酸浸渣铜品位可降至0.3%以下;脱铜渣在NaCN浓度为4‰、矿浆浓度为30%,氰化时间24 h的条件下,Au浸出率达96%以上,实现了Au和Cu的高效回收。

Focusing on refractory gold concentrate containing copper,the technology of roasting-acid leaching- cyanidation was studied and the optimized condition was obtained.Experimentation results show that Cu leaching rate is above 95% and copper grade of acid-leach residue is low of 0.3% when concentrate roasted 2 hours at temperature of 540 ℃,roasted product is leached with sulfuric acid of 30 g/L under conditions of 3 of liquid-solid ratio, 90 ℃ of temperature and time of 1.5 hours.The recovery rate of Au is above 96% when decoppering slag is leached with the densities of sodium cyanide of 4%0 under conditions of 30% of pulp density and time of 24 hours. This process realizes recovery Au and Cu in high efficiency.