摘要：利用CO₂-Ca(OH)₂-H₂O体系制备了纳米级碳酸钙粒子,探讨了无添加剂制备过程中CO₂流量对粒子大小和分散性能的影响。碳化前,在体系中引入了能与Ca²⁺生成沉淀的化合物,研究了硅酸钠、草酸钾、硼酸等对促进碳酸钙成核的效果。利用TEM、XRD和粒度分布测试对产品进行了表征。结果表明:CO₂的最佳流量为6￣7 mL/s。添加草酸钾后制得的产品,具有粒度均匀、分散性好等优点,粒子的平均粒径为60￣70 nm。

关键词：纳米碳酸钙;碳化;非均相成核

Abstract：Nano-sized calcium carbonate particles were prepared by CO₂-Ca(OH) ₂-H₂O system.Effect of CO₂ flow rate on particle size and dispersity was investigated in the process of no additive.Before the carbonation the compound that could react with Ca²⁺ into precipitation was added into the reaction system,and additives'(Na₂SiO₃,K₂C₂O₄,H₃BO₃) effect of impel nucleation was studied during the heterogeneous nucleation.Particles were characterized by TEM?XRD and particle size distribution analysis.The results show that the better CO₂ flow rate is 67 mL/s.In addition,particles synthesized by adding K₂C₂O₄ additive have uniform size and better dispersity,and the average particle size is 6070 nm.

Keywords：nano-sized calcium carbonate;carbonation;nonhomogen-ous nucleation