二氧化硫液相浸取低品位软锰矿的动力学

研究了液相中二氧化硫对低品位软锰矿的浸出行为。考察了液相搅拌转速、温度、二氧化硫浓度及pH对锰浸出率的影响，研究了软锰矿粒径及表面元素相对含量随锰浸出率的变化，并对其浸出的动力学模型进行了分析。实验结果表明，搅拌转速为400r/min时可消除外扩散对锰浸出率的影响。锰浸出率随温度、二氧化硫浓度的升高而增大，随pH的增大而减小。当锰浸出率为80%时，软锰矿粒径减小约20%，表面锰含量减小73%，硅元素含量增大18%。动力学研究结果表明，软锰矿的浸出过程为扩散-化学反应混合控制过程，反应的活化能为36.85KJ/mol，二氧化硫浓度、氢离子反应级数分别为1.5595和0.5884。

Leaching kinetics of Mn from low grade pyrolusite with SO2 in liquid phase

Leaching process of Mn from low grade pyrolusite with SO2 in liquid phase was studied. Effects of agitation speed, leaching temperature, SO2 concentration and pH on Mn extraction rate were determined. Changes of particle size and surface element content of pyrolusite were determined. The results indicate that effect of outward diffusion can be eliminated when agitation speed at 400r/min. Mn extraction rate increases with increasing temperature, SO2 concentration and decreasing pH. A decrease of pyrolusite particle size at 20%, a decrease of Mn at 73% and a increase of Si at 18% on pyrolusite surface were found when Mn extraction rate at 80%. The leaching kinetics showed that the leaching reaction is controlled by both chemical reaction on particle surface and diffusion across the product layer. The determined activation energy was found to be 36.85 kJ/ mol and the reaction orders with respect to SO2 concentration and H+ were 1.5995 and 0.5884, respectively.