摘要
研究了碳酸锰热解过程的动力学 ,确定了有关动力学参数。在热解过程中 ,MnCO3离解符合收缩核模型 ,MnO氧化符合颗粒模型。MnCO3离解为化学反应所控制 ,MnO氧化的前期是混合控制 ,氧化后期是扩散控制 ,氧气在MnO2 产物层中的扩散是MnO氧化的限制环节。加快MnO氧化速率的有效方法是改变MnO2 产物层的结构 ,使其多孔疏松 ,以此增大氧气的扩散系数。
The kinetics on the thermal decomposition of MnCO 3 was investigated. The parameters in the kinetic equations were worked out. The results showed that the decomposition reaction of MnCO 3 follows the shrinking core model, and the control step is chemical reaction; the oxidation of MnO obeys the grain pellet model, during the initial period, the oxidation reaction is simultaneously controlled by reaction and diffusion, and later by diffusion only. The diffusion of oxygen in MnO 2 products layer is a restraining factor of MnO oxidation, the effective method of speeding up MnO oxidation rate is changing the structure of the MnO 2 products layer in order to make it become porous, loosened and enlarged the diffusion coefficient of oxygen.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2000年第1期113-116,共4页
The Chinese Journal of Nonferrous Metals
