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对铅阳极泥进行预氧化、浸出和还原沉淀处理回收Te,结果表明,优化的Te回收工艺为自然堆放氧化处理-硫酸+氯化钠+氯酸钠体系浸出-控电位亚硫酸钠沉Te。铅阳极泥经过自然堆放氧化处理4d后,在3 mol/L硫酸+3mol/L氯化钠+20%氯酸钠体系、L/S=5∶1、反应温度80℃、反应时间4h的条件下搅拌浸出,Te浸出率达到了92.15%,Cu及其他有价元素的浸出率均在90%以上,Ag、Pb则留在渣中。对浸出液进行控电位亚硫酸钠沉Te,控制电位在0.342~0.568V之间,以两倍理论量的亚硫酸钠作为还原剂,Te还原率达92.57%,Cu及其他有价元素留在溶液中进行下一步回收。采用该优化工艺从铅阳极泥中回收Te至粗Te渣,Te综合回收率可达85%以上。
The results showed that the optimized Te recovery technology was natural deposition and oxidation treatment - sulfuric acid + sodium chloride + sodium chlorate system leaching - controlled potential sodium sulfite sink Te. Lead anode slimes were naturally oxidized for 4 days in the condition of 3 mol / L sulfuric acid + 3 mol / L sodium chloride + 20% sodium chlorate system, L / S = 5:1, reaction temperature 80 ℃ and reaction time 4h Leaching under stirring, Te leaching rate reached 92.15%, Cu and other valuable elements leaching rate of 90% or more, Ag, Pb remain in the slag. The leaching solution was controlled potential sodium sulfite Shen Te, the control potential of 0.342 ~ 0.568V between two times the theoretical amount of sodium sulfite as a reducing agent, Te reduction rate of 92.57%, Cu and other valuable elements left in solution for the next step Recycling. The optimized process was used to recover Te from crude anode slime to coarse Te residue, and the comprehensive recovery rate of Te was over 85%.