摘要
采用循环碳化浸取制备轻质碳酸镁，对循环碳化过程进行了传质过程及动力学研究.考察了气体流量、配气比例、粒度等因素对循环碳化过程的影响，从理论上建立了循环碳化过程的传质和反应动力学模型.计算推导及实验结果表明，在温度10-25℃区间，其表观活化能为18.6kJ/mol，扩散传质为循环碳化过程控制步骤；而在25-35℃区间，其表观活化能为33.15kJ/mol，循环碳化过程由传质扩散与表面化学反应混合控制.
The mass transfer and kinetics on the preparation process of light magnesium carbonate by stream-recycling carbonation were studied. The influences of gas flow, distribution proportion of gas and particle size, etc., on the process of stream-recycling carbonation were examined. At the same time, its model of stream-recycling reaction was built theoretically. The results show that the process of stream-recycling carbonation is controlled by diffusion mass transfer within 10-25℃, of which activation energy is 18.6 kJ/mol, while controlled by diffusion mass transfer and surface chemical reaction altogether within 25-35 ℃, of which activation energy is 33.15 kJ/mol.
出处
《过程工程学报》
CAS
CSCD
北大核心
2009年第3期424-430,共7页
The Chinese Journal of Process Engineering
关键词
循环碳化
轻质碳酸镁
菱镁矿
传质
动力学
stream-recycling carbonation
light magnesium carbonate
magnesite
mass transfer
kinetics
