采用焙烧-酸浸-氰化工艺从沉积污泥中提取金、银，试验考察了氰化浸出反应液固比、pH值、氰化钠质量分数、反应时间、搅拌速度对金、银浸出率的影响。沉淀污泥在焙烧温度903 K、焙烧时间2 h的条件下，进行预处理；焙砂在反应液固比4∶1、硫酸浓度0．5 mol/L、反应时间3 h、反应温度323 K、搅拌速度300 r/min的条件下，进行硫酸浸出；酸浸渣在反应液固比4∶1、pH 10．5、氰化钠质量分数0．4％、反应温度298 K、搅拌速度250 r/min、反应时间72 h的条件下，进行氰化浸出；金、银浸出率分别可达93．2％、79．1％。
Roasting-acid leaching-cyanide process was used to extract gold and silver from depositing-sludge.The effects of liquid-solid ratio,pH value,NaCN concentration,reaction temperature,stirring speed on extraction rate of gold and silver were investigated.Pre-treatment of depositing-sludge is done with the roasting temperature of 903 K and roasting time of 2 h.The sulfuric acid leaching of calcine goes under the conditions such as liquid-solid ratio of 4∶1, H2 SO4 concentration of 0.5 mol/L, reaction temperature of 323 K, reaction time of 3 h and stirring speed of 300 r/min.The cyanide leaching condition is like this:liquid-solid ration of 4∶1,pH value of 10.5,NaCN concentra-tion of 0.4 %,stirring speed of 300 r/min and reaction time of 72 h.Under such conditions,the extraction rates of gold and silver were respectively 93.20 %and 79.10 %.
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