超重力反应结晶法制备纳米碳酸钙颗粒研究

以Ca（OH）2悬浊液和CO2气体在起重力反应器（旋转填充床反应器）中进行碳化反应制备纳米立方形碳酸钙为研究对象，实验研究了超重力加速度gr，液体循环量L，气体流量G，Ca（OH）2初始浓度等操作条件对产物粒度及其分布、碳化反应时间的影响。结果表明：利用超重力反应结晶法可以制备出平均粒度为15～40nm、分布较窄的CaCO3，碳化反应时间较传统方法缩短约4～10倍。

Study on Synthesis of Nanometer Cubic Calcium Carbonate by High-Gravity Reactive Precipitation

The synthesis of nano-sized cubic CaCO3 by the high-gravity reactive precipitation in a rotating packed bed reactor(RPBR) were studied. The effects of high gravity acceleration, liquid flow volumetric rate,gas flow volumetric rate and initial concentration of Ca(OH)2 on the carbonation reaction time and the mean particle size and variance of particle size distribution of CaCO3 were investigated. The results showed that the CaCO3 particles with the mean size of 15 ~40nm and very narrow size distribution were produced,and the carbonation reaction time is 4~10 folds shorter than that of using conventional carbonation method.