钛白绿矾渣与电解锰渣协同浸出试验研究

Synergistic leaching of titanium alumslag and electrolytic manganese slag

广西是我国重要的电解二氧化锰和钛白生产基地,电解锰渣和钛白绿矾渣的处理一直是制约两个行业发展的难题。由于钛白绿矾渣中的硫酸亚铁可用作还原剂浸出电解锰渣中的MnO2,因此本研究进行了硫酸体系下电解锰渣浸锰试验,考察了电解锰渣与绿矾渣配比、浸出温度、硫酸浓度、浸出时间、固液比对锰浸出率的影响,并对浸出反应进行动力学分析。试验结果表明:在电解锰渣和绿矾渣质量比10:1.0、浸出温度50℃、硫酸浓度1.0 mol/L、浸出时间1.0 h、固液比为1:15 g/mL的条件下,锰的浸出率达到98.67%;浸出反应符合收缩核模型,反应表观活化能为40.47 kJ/mol,表明浸出受内扩散-界面化学反应控制;试验还根据线性拟合结果确定了锰浸出过程的宏观动力学方程。该研究为回收电解锰渣中的锰,实现电解锰渣和钛白绿矾渣的资源化利用提供了参考依据,对固废减量化处置具有现实意义。

Guangxi is an important production base of electrolytic manganese dioxide and titanium dioxide in China.The treatment of electrolytic manganese slag and titanium alum slag has always been a difficult problem restricting the development of the two industries.Since the ferrous sulfate of titanium alum slag can be used as a reducing agent to leach MnO2 from electrolytic manganese slag,the manganese leaching test of electrolytic manganese slag in sulfuric acid system was carried out in this study.The effects of the ratio of electrolytic manganese slag to titanium alum slag,leaching temperature,sulfuric acid concentration,leaching time and solid-liquid ratio on the leaching rate of manganese were investigated,and the leaching reaction kinetics was analyzed.The results showed that under the conditions of mass ratio of electrolytic manganese slag to green alum slag 10:1.0,leaching temperature 50℃,sulfuric acid concentration 1.0 mol/L,leaching time 1.0 h and solid-liquid ratio 1:15 g/m,the leaching rate of manganese reached 98.67%.The apparent activation energy of the reaction was 40.49 kJ/mol,which indicated that the leaching was controlled by internal diffusion-interfacial reaction.The macroscopic kinetic equation of manganese leaching process was also determined according to the linear fitting results.This study provides a reference for the recovery of manganese from electrolytic manganese slag and the resource utilization of electrolytic manganese slag and titanium alum slag,and has practical significance for the reduction and disposal of solid waste.