Recovering Tellurium and Valuable Metals from Complex Cu-Te-Bi Slag by a Synergistic Approach of Oxidation Leaching
LIU Yuan1, LI Yao-shan1, LI Jin-qiong1, KONG De-hong1, SHI Yun-zhang2, ZHANG Dong-yang2, GUO Hui2
1.Western Mining Group Science and Technology Development Co Ltd, Xining 810001, Qinghai, China;
2.Qinghai Xiyu Nonferrous Metals Co Ltd, Golmud 816099, Qinghai, China
Abstract：With Cu-Te-Bi slag obtained after the pyrometallurgical treatment of copper and lead anode slime as the raw material, the processing technique consisting of neutral leaching, a synergistic process of oxidation leaching, copper precipitation with oxalic acid, bismuth precipitation by hydrolysis, and tellurium reduction with sodium sulfite was adopted to separate and recover tellurium and valuable metals in the Cu-Te-Bi slag. The effects of sulfuric acid concentration, hydrogen peroxide dosage, NaCl concentration, leaching time, leaching temperature, liquid-solid ratio on the leaching rates of copper, tellurium and bismuth by the synergistic leaching method, the effect of excessive oxalic acid coefficient on copper precipitation, the effect of ending pH value on bismuth precipitation rate, as well as the effect of Cl- concentration on tellurium reduction rate were all explored. Results showed that the leaching rates of copper, tellurium and bismuth reached 98.2%, 90.1% and 99.3%, respectively, with the sulfuric acid concentration of 4 mol/L, the hydrogen peroxide dosage of 0.6 mL/g, the NaCl concentration of 2.5 mol/L, the leaching time of 1 h, the leaching temperature of 80 ℃, as well as the liquid-solid ratio of 3 mL/g. By adding oxalic acid at an amount of one time the theoretical value, the copper recipitation rate reached 99.2%; the bismuth precipitation rate reached 97.72% with the ending pH=2; the reduction rate of tellurium reached 95.6% when Cl- concentration was 0.8 mol/L. It is shown that copper can be recovered in the form of copper oxalate, bismuth recovered in the form of bismuth oxychloride and tellurium recovered in the form of tellurium powder.
刘远, 李耀山, 李金琼, 孔德鸿, 石云章, 张东阳, 郭辉. 氧化协同浸出复杂铜碲铋渣中的碲及有价金属[J]. 矿冶工程, 2021, 41(2): 75-79.
LIU Yuan, LI Yao-shan, LI Jin-qiong, KONG De-hong, SHI Yun-zhang, ZHANG Dong-yang, GUO Hui. Recovering Tellurium and Valuable Metals from Complex Cu-Te-Bi Slag by a Synergistic Approach of Oxidation Leaching. Mining and Metallurgical Engineering, 2021, 41(2): 75-79.
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2021, Vol. 41 
