(1. 西安建筑科技大学冶金工程学院，西安710055; 2. 中南工业大学冶金系，长沙410083)
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。
关键字: 碳酸锰；热解；动力学
（1. College of Metallurgy, Xi'an University of Architecture and Technology, Xi'an 710055, P.R.China;
2. Department of Metallurgy, Central South University of Technology, Changsha 410083, P.R.China）
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.
Key words: MnCO3; thermal decomposition; kinetics
