采用焙烧-硫酸浸出-氰化浸出工艺，从某复杂工业废渣中提取银。通过试验考察了焙烧气氛、添加剂种类和加入量、焙烧温度、焙烧时间等预处理因素对银浸出率的影响。试验结果表明：优化焙烧预处理条件为富氧气氛、温度903 K、焙烧时间3 h、添加剂硫酸钠加入量3％；焙砂经酸浸-氰化浸出后，银的提取率为78．41％；废渣中银质量分数由原来的0．049％降低至0．0145％。
Roasting-sulfuric acid leaching-cyanide leaching process is used to extract silver from complex industri-al residues.The effects of roasting atmosphere ,additives and their dosage ,roasting temperature and time have on ex-traction rate of silver were investigated by experiments .The results show that the optimal roasting conditions include rich oxygen ,3 %of sodium carbonate dosage ,903 K of roasting temperature ,and 3 h of roasting time .With the calci-ning leached by sulfuric acid and cyanide ,the extraction rate of silver was 78.41%,and then the content of silver in residues can be reduced from 0.049 %to 0.014 5 %.
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