(中南大学 冶金与环境学院，长沙 410083)
摘 要: 以氰化尾渣为原料，采用还原焙烧酸浸工艺对其进行处理。当还原温度为850 ℃、加入煤粉质量为氰化尾渣质量的13%、还原时间为100 min 时，对氰化尾渣进行还原，氰化尾渣中Fe2O3 转化为Fe3O4 或FeO。还原后采用硫酸浸出，当硫酸浓度为50%、硫酸用量系数为1.2、反应温度为105 ℃、反应时间为3 h 时，铁的浸出率达到93.66%。还原焙烧渣在600 ℃氧化焙烧2 h 经过脱碳后氰化浸金，当氰化钠用量为4 kg/t、反应时间为28 h、液固比为2:1 时，金的浸出率达到92.4%。经过还原焙烧、硫酸浸出、氧化焙烧及氰化浸金，氰化尾渣渣量减少了38.8%。
关键字: 氰化尾渣；还原焙烧；硫酸浸出；氰化法；金
（School of Metallurgy and Environment,Central South University,Changsha 410083）
Abstract:The cyanide tailings were treated by reduction roasting and acid leaching. The cyanide tailings were reduced under conditions of reduction temperature 850 ℃,the mass ratio of pulverized coal to cyanide tailings 13% and reduction time 100 min. Fe2O3 in the cyanide tailings is turned into Fe3O4 or FeO. The reduced cyanide tailings were leached by sulfuric acid under conditions of a concentration of sulfuric acid 50%,the sulfuric acid dosage coefficient 1.2,leaching temperature 105 ℃ and leaching time 3 h. The leaching rate of Fe is 93.66%. The leaching rate of Au is 92.4% under conditions of sodium cyanide dosage 4 kg/t,leaching time 28 h,the ratio of liquid to solid 2:1 after acidic residue is roasted at 600 ℃ for 2 h to remove carbon. The mass of cyanide tailings decreases by 38.8% after reduction roasting,sulfuric acid leaching,oxidizing roasting and cyanide leaching.
Key words: cyanide tailings; reduction roasting; sulfuric acid leaching; cyanide process; gold
