两矿法浸出电解锰阳极渣中锰的研究

Leaching of Manganese in Anode Residue from Manganese Electrolysis

采用两矿法还原浸出电解锰阳极渣中的锰。以硫铁矿为还原剂、电解金属锰阳极渣作氧化剂,在硫酸溶液中实现电解锰阳极渣中锰的浸出。考察了硫铁矿与阳极渣质量比、硫酸与阳极渣中MnO_(2)摩尔比、反应时间、反应温度对锰浸出效果的影响。结果表明,最佳实验条件为:硫铁矿与阳极渣质量比2∶1、硫酸与阳极渣中MnO_(2)摩尔比1.8∶1、反应时间5.5 h、实验温度90℃、液固比6∶1,此时锰浸出率达到99.1%。

The manganese in anode residue from manganese electrolysis was recovered by adopting reduction leaching process with two-ores method.It is shown that with pyrite as the reducing agent,the anode residue from manganese electrolysis as the oxidant,the leaching of manganese from the anode residue can be achieved in sulfuric acid solution.Effects of those factors,including mass ratio of pyrite to anode residue,molar ratio of sulfuric acid to MnO_(2) in the anode residue,as well as reaction time and temperature,on the manganese leaching rate were investigated.It is found that optimally with the mass ratio of pyrite to anode residue at 2∶1,the molar ratio of 1.8∶1 for sulfuric acid to MnO_(2) in the anode residue,the liquid-solid ratio of 6∶1,the leaching rate of Mn^(2+) can reach 99.1% after the reaction at 90℃ for 5.5 h.