用硫酸从废碱性电池中选择性浸出锌

摘要

Spent alkaline zinc-manganese battery polar material mainly composes of manganese oxide , ZnO and graphite .Based on the different solubility of manganese oxides and ZnO in acid medium , sulfuric acid leaching of zinc is experimented to separate zinc and manganese .T he effect of the ratio between liquid volume and solid mass ,sulfuric acid concentration ,leaching time and leaching temperature on zinc and manganese leaching rate was investigated .The experimental results show that leaching rate of zinc and manganese reach 99% and 14% ,respectively at the conditions of leaching time of 1 h ,sulfuric acid concentration of 1 .0 mol/L ,the ratio between liquid volume and solid mass of 10 , temperature of 25 ℃ .T he XRD spectrum of leached residue show that zinc has been largely leached , the residues mainly contain graphite and manganese dioxide .%废碱性锌锰电池的极性材料主要由锰氧化物、ZnO和石墨组成。基于锰氧化物和ZnO在酸性介质中的溶解性差异，研究了用硫酸浸出锌，并实现锌、锰分离，考察了硫酸浓度、液固体积质量比、浸出时间、浸出温度对锌、锰浸出率的影响。结果表明：在硫酸浓度1．0 mol/L、液固体积质量比10∶1、反应时间1 h、温度25℃条件下，锰浸出率为14％，而锌浸出率达99％。浸出渣的XRD图谱表明，锌几乎完全浸出，剩余成分主要为石墨和二氧化锰。