(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 以氰化尾渣為原料，采用還原焙燒酸浸工藝對其進(jìn)行處理。當(dāng)還原溫度為850 ℃、加入煤粉質(zhì)量為氰化尾渣質(zhì)量的13%、還原時間為100 min 時，對氰化尾渣進(jìn)行還原，氰化尾渣中Fe2O3 轉(zhuǎn)化為Fe3O4 或FeO。還原后采用硫酸浸出，當(dāng)硫酸濃度為50%、硫酸用量系數(shù)為1.2、反應(yīng)溫度為105 ℃、反應(yīng)時間為3 h 時，鐵的浸出率達(dá)到93.66%。還原焙燒渣在600 ℃氧化焙燒2 h 經(jīng)過脫碳后氰化浸金，當(dāng)氰化鈉用量為4 kg/t、反應(yīng)時間為28 h、液固比為2:1 時，金的浸出率達(dá)到92.4%。經(jīng)過還原焙燒、硫酸浸出、氧化焙燒及氰化浸金，氰化尾渣渣量減少了38.8%。
關(guān)鍵字: 氰化尾渣；還原焙燒；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
