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在Ca(OH)2—H2O—CO2反应体系中,根据非均匀成核原理,通过调整体系反应温度、Ca(OH)2浓度、ZnSO4添加量等反应参数,控制在白云石颗粒表面生成具有链状结构的纳米Ca-CO3包覆层.利用SEM,XRD等检测表征手段,分析了不同反应参数对纳米CaCO3晶形的影响.结果表明:当反应温度为25℃,ZnSO4加入量为Ca(OH)2的4%,Ca(OH)2浓度为0.3mol/L时,在白云石颗粒表面生成了长径比为7∶1的链状纳米CaCO3.提高体系的反应浓度能够减少ZnSO4的加入量.
In the Ca (OH) 2-H2O-CO2 reaction system, according to the heterogeneous nucleation principle, the reaction parameters such as reaction temperature, Ca (OH) 2 concentration, Like structure of nano-Ca-CO3 coating.The effects of different reaction parameters on the morphology of nano-CaCO3 were analyzed by SEM and XRD.The results showed that when the reaction temperature was 25 ℃, the amount of ZnSO4 added was Ca (OH) 2, 4% Ca (OH) 2 concentration of 0.3mol / L, the aspect ratio of 7:1 chain-like nano-CaCO3 was formed on the surface of dolomite particles.Improving the system reaction concentration can reduce the amount of ZnSO4 added.