福建某金精矿焙砂浸出金、银试验研究

Research on the Cold,Silver Leaching Process of a Gold Concentrate Calcine in Fujian

福建某金精矿焙砂主要组成矿物为赤铁矿与石英,金、银含量分别为31.27 g/t、824 g/t。采用自主合成的嗜金1号药剂从稀硫酸脱铜后的该金精矿焙砂中提取金、银。结果表明,在嗜金1号用量为5 g/L、pH为11、液固比为5 mL/g、浸出温度为25℃、浸出时间为24 h时,金与银的浸出率分别达到92.76%、85.02%。比以氰化钠为浸出剂时,金浸出率提高了3.73个百分点。嗜金1号的浸金效果较优,且嗜金1号较氰化钠对环境的影响较弱。因此,嗜金1号可以用于含金焙砂的金浸出工艺。

The main phase of the gold concentrate calcine in Fujian Province is hematite and quartz. The content of gold and silver is 31.27 g/t and 824 g/t, respectively. The copper was extracted by dilute sulfate leaching method. Then, the gold and silver were extracted by the self-made agent named Addicted-gold NO.1. The result showed that when the Addicted-gold NO.1 agent dosage of 5 g/L, pH value of 11, liquid-to-solid ratio of 5 mL/g, reaction temperature of 25 ~C, leaching time of 24 h, leaching rate of gold and silver were 92.76% and 85.02%, respectively. The leaching rate of gold was 3.73 percentage points higher than that by sodium cyanide method. Hence, the Addicted-gold NO.1 not only has excellent effect of the gold leaching rate, but also has weak impact on the environment. Therefore, the Addicted-gold NO.1 can be used in gold leaching process from gold concentrate calcine.