硫酸亚铁还原硫酸浸取软锰矿动力学研究

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）c■c■exp［-29 680/（RT）］t，其表观活化能为29.68 kJ/mol。

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

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：1-2/3x-（1-x）2/3= 1.95（1/d02）c■c■exp［-29 680/（RT）］t，and the apparent activation energy was 29.68 kJ/mol.