硫酸亚铁还原硫酸浸取软锰矿动力学研究  

Study on sulfuric acid leaching kinetics of pyrolusite with ferrous sulfate as reducing agent

作　　者：崔益顺[1,2] 向云刚 

机构地区：[1]四川理工学院材料与化学工程学院,四川自贡643000 [2]企业信息化与物联网测控技术四川省高校重点实验室

出　　处：《无机盐工业》2015年第1期26-29,共4页Inorganic Chemicals Industry

基　　金：四川省教育厅重点项目(13ZA0127);企业信息化与物联网测控技术四川省高校重点实验室开放基金项目(2013WZJ01)

摘　　要：以硫酸亚铁作为还原剂,研究硫酸浸取软锰矿过程的动力学。考察了搅拌速率、浸出温度、硫酸初始浓度、硫酸亚铁初始浓度、矿粉初始粒度对锰浸出率的影响。结果表明:锰浸出速率随搅拌速率的增大、浸出温度的升高、硫酸浓度的增大、硫酸亚铁浓度的增大、矿粉初始粒径的减小而增大,其中矿粉粒度对锰浸出率的影响最大,硫酸浓度次之,硫酸亚铁浓度影响较小。硫酸亚铁作为还原剂,在硫酸环境下浸出软锰矿的过程受内扩散控制,浸出过程的宏观动力学方程为:1-2/3x-(1-x)2/3=1.95(1/d02)cH2SO4cFe SO4exp[-29 680/(RT)]t,其表观活化能为29.68 k J/mol。The leaching kinetics of pyrolusite by sulfuric acid with ferrous sulfate as reducing agent was studied.The effects of stirring intensify, leaching temperature, initial concentration of sulfuric acid, initial concentration of ferrous sulfate, and initial particle size of mineral powder on the leaching rate of manganese were investigated.The results showed that the leaching rate of manganese was increased with the increase of the stirring speed, leaching temperature, sulfuric acid concentration, ferrous sulfate concentration and the decrease of diameter of pyrolusite.The influence order was particle size of mineral powder, concentration of sulfuric acid, and concentration of ferrous sulfate.The pyrolusite leaching process was controlled by the diffusion through the solid film.The macroscopic kinetic equation of the leaching process was：l-2/3x-（1-x）2/3=1.95 （ 1/do2 ）CHso CFso exp [-29 680/（RT） It, and the apparent activation energy was 29.68 kJ/mol.

关 键 词：软锰矿 硫酸亚铁 硫酸 浸取动力学 锰浸出率 

分 类 号：TQ125.14[化学工程—无机化工]