采用焙烧-酸浸-氰化工艺综合回收复杂金精矿中的金、银、铜.结果表明，焙烧温度、焙烧时间、焙烧添加剂种类和用量对金、银、铜浸出率影响显著.实验确定了较优工艺条件为：焙烧添加剂NaOH用量为6%，温度630℃，焙烧时间3 h，硫酸浓度1 mol/L，酸浸液固体积质量比5∶1，酸浸温度50℃，酸浸4 h，氰化纳浓度3‰，氰化浸出液固体积质量比5∶1，常温氰化72 h.在上述条件下，金、银、铜浸出率分别达到93.53%、75.37%、94.23%.%Gold, silver and copper were extracted from complex gold concentrate by roasting-acidic leaching-cyanidation process. The experimental results show that the roasting temperature, time, additive and its dosage have great influence on the leaching of gold, silver and copper. The optimal conditions were further determined as follows: NaOH dosage of 6 %(ω), roasting temperature of 630 °C, roasting time of 3 h, sulfuric acid concentration of 1 mol/L, liquid to solid ratio of 5∶1 in acidic leach, leaching temperature of 50 °C, leaching time of 4 h, sodium cyanide concentration of 3 ‰, liquid to solid ratio of 5∶1 in cyanidation, room temperature and cyanidation time of 72 h. Under above-mentioned conditions, the leaching rate of gold, silver and copper achieved at 93.53%, 75.37%and 94.23%respectively.
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