碳酸锰热解过程的动力学

来源期刊：中国有色金属学报2000年第1期

论文作者：王成刚 朱军 韩景智 赵秦生

文章页码：113 - 116

关键词：碳酸锰；热解；动力学

Key words：MnCO₃; thermal decomposition; kinetics

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。

Abstract: The kinetics on the thermal decomposition of MnCO₃ was investigated. The parameters in the kinetic equations were worked out. The results showed that the decomposition reaction of MnCO₃ 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 MnO₂ products layer is a restraining factor of MnO oxidation, the effective method of speeding up MnO oxidation rate is changing the structure of the MnO₂ products layer in order to make it become porous, loosened and enlarged the diffusion coefficient of oxygen.