摘要
以粗铋碱性精炼产生的碲渣为原料,基于高级氧化技术(AOP),在硫酸体系中协同氧化浸出碲渣中的碲和有价金属,研究NaCl浓度、H_2O_2体积分数、H_2O_2滴加速度、H_2SO_4浓度、浸出温度、浸出时间、气体流速和液固比等工艺参数对碲、铜、铋、锑和铅等金属浸出行为的影响,确定最佳工艺参数。结果表明:在NaCl浓度0.75 mol/L、H_2O_2体积分数20%、H_2O_2滴加速度1.2 mL/min、H_2SO_4浓度2.76 mol/L、浸出温度60℃、浸出时间2.5 h、气体流速2.5 L/min和液固比10 mL/g的优化条件下,碲、铜和铋的浸出率分别达95.75%、91.88%和90.23%,而锑和铅的浸出率仅分别为4.84%和0.08%,实现碲渣中碲的高效浸出及有价金属的有效分离和富集。
Based on advanced oxidation process （AOP）, tellurium slag, which came from basic refining of bismuth crude, was processed by coordination oxidative leaching in sulfuric acid. The effects of various parameters, such as concentration of NaCl and H2SO4, volume fraction of H2O2, dropping speed of H2O2, leaching temperature and time, gas flow rate and liquid to solid ratio on leaching behavior of Te, Cu, Bi, Sb and Pb were investigated. The optimal conditions were determined as follows： NaCl concentration of 0.75 mol/L, H2SO4 concentration of 2.76 mol/L, volume fraction of H2O2 of 20%, dropping speed of H2O2 of 1.2 mL/min, leaching temperature of 60 ℃ and leaching time of 2.5 h, liquid to solid ratio of 10. Under the optimal conditions, the leaching efficiencies of Te, Cu and Bi reach 95.75%、91.88% and 90.23%, while the leaching efficiencies of Sb and Pb are 4.84% and 0.08%, respectively, achieving efficient leaching of tellurium and separation and enrichment of valuable metals from tellurium slag relatively.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2018年第1期167-174,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金重点项目(51234009)
科技部国际合作专项(2014DFA90520)
广东省产学研项目(2013A100003)~~
关键词
碲渣
高级氧化技术
协同氧化
浸出
分离
富集
tellurium slag
advanced oxidation process
coordination oxidation
separation
enrichment
