(NH_4)_2SO_4介质中金属锰与水的反应及其动力学研究

The study of kinetics and reaction between metallic manganese and water in (NH_4)_2SO_4 solution

研究了硫酸铵介质中金属锰与水的反应及其动力学,考察了反应过程有关参数对反应速度的影响。研究证明,在硫酸铵介质中,金属锰可与水发生置换反应生成氢氧化锰,利用此反应可以制备高纯氢氧化锰。试验结果表明,随硫酸铵浓度的增加,反应速度加快;在硫酸铵介质中,金属锰与水的置换反应属扩散控制,反应的表观活化能为17.46kJ/mol;经XRD检测及SEM形貌分析证明,所得Mn(OH)2产物为片状六方晶体,颗粒较均匀,SEM粒径为3～4μm。

The kinetics and reaction between metallic manganese and water were studied in (NH4)2SO4 solution. The effects of related parameters upon the reaction kinetics were investigated. The research proved that in (NH4)2SO4 solution metallic manganese react completely with water to convert to Mn(OH)2. By means of the reaction high pure Mn(OH)2 can be prepared. With the increase of concentration of (NH4)2SO4, the reaction rate speeds up. The reaction was controlled by diffusion with apparent activation energy of 17.46kJ/mol. By means of XRD and SEM, the Mn(OH)2 product was proved to be exfoliating hexahedral and uniform with granularity of 3～4μm.