(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083； 2. 中國有色金屬工業(yè)清潔冶金工程研究中心，長沙 410083)
摘 要: 以粗鉍堿性精煉產(chǎn)生的碲渣為原料，基于高級氧化技術(shù)(AOP)，在硫酸體系中協(xié)同氧化浸出碲渣中的碲和有價金屬，研究NaCl濃度、H2O2體積分數(shù)、H2O2滴加速度、H2SO4濃度、浸出溫度、浸出時間、氣體流速和液固比等工藝參數(shù)對碲、銅、鉍、銻和鉛等金屬浸出行為的影響，確定最佳工藝參數(shù)。結(jié)果表明：在NaCl濃度0.75 mol/L、H2O2體積分數(shù)20%、H2O2滴加速度 1.2 mL/min、H2SO4濃度2.76 mol/L、浸出溫度60 ℃、浸出時間2.5 h、氣體流速2.5 L/min和液固比10 mL/g的優(yōu)化條件下，碲、銅和鉍的浸出率分別達95.75%、91.88%和90.23%，而銻和鉛的浸出率僅分別為4.84%和0.08%，實現(xiàn)碲渣中碲的高效浸出及有價金屬的有效分離和富集。
關(guān)鍵字: 碲渣；高級氧化技術(shù)；協(xié)同氧化；浸出；分離；富集
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China; 2. Cleaner Metallurgical Engineering Research Center, Nonferrous Metal Industry of China, Changsha 410083, China）
Abstract: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.
Key words: tellurium slag; advanced oxidation process; coordination oxidation; separation; enrichment
