氰化尾渣还原焙烧酸浸提铁及氰化浸金新工艺  

New technology of iron extraction and gold recovery from cyanide tailings by cyanide process after reduction roasting and acid leaching

作　　者：郑雅杰[1] 龚昶[1] 孙召明[1] 

机构地区：[1]中南大学冶金与环境学院,长沙410083

出　　处：《中国有色金属学报》2014年第9期2426-2433,共8页The Chinese Journal of Nonferrous Metals

基　　金：新疆有色基金资助项目(XJYS20121205)

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%。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.

关 键 词：氰化尾渣 还原焙烧 硫酸浸出 氰化法 金 

分 类 号：TF803.21[冶金工程—有色金属冶金]