中文摘要：

以氯化钙和碳酸钠制备碳酸钙为例,将套管式微反应器应用于颗粒的制备过程,并详细考察了各种操作条件对颗粒制备的影响。对所得产品进行SEM和粒度分布分析,结果表明：颗粒粒径随着体系总流量和反应物浓度的增大而减小;微反应器混合距离对颗粒平均粒径无明显影响。将套管式微反应器沉淀法与直接沉淀法进行比较,结果发现,直接沉淀法得到的颗粒形貌差,颗粒粒径在8-11μm之间;而在相同的反应条件下,套管式微反应器可以制得平均粒径为0.89μm,分散性良好的球形碳酸钙颗粒。

英文摘要：

The preparation of ultrafine CaCO3 particles from a solution reaction between CaCl2 and NaaCO3 in a novel tube-in-tube microreactor is described. The effects of varying different factors such as flow rate, reactant concentration, micro-pore size and mixing distance were investigated in detail. The sizes and morphologies of particles prepared using the microreactor were characterized by scanning electron microscopy and compared with those of a material prepared by a direct precipitation method. The results showed that the mean particle diameter decreased with increasing total flow rate and concentrations of the reactants. The mixing distance had no significant effect on the particle size. Furthermore, it was found that the particles prepared using the microreactor had a mean diameter of 0.89 μm with a narrow size distribution, while the particles obtained using direct chemical precipitation under the same conditions had a broad distribution of particle size in the range 8 - 11 μm.