摘要
在搅拌鼓泡釜中研究了碳化法制备立方形纳米碳酸钙的各个实验参数,包括碳化温度、氢氧化钙质量分数、二氧化碳流量、晶形导向剂、搅拌速度等对产品形貌和粒径的影响,采用扫描电镜、X射线衍射仪对产品进行了表征。结果表明：晶形导向剂、氢氧化钙质量分数是影响产品形貌的主要因素;碳化温度、二氧化碳流量和搅拌速度是影响产品粒径的主要因素。以硫酸锌为晶形导向剂合成立方形纳米碳酸钙的最佳碳化条件：碳化温度为15-30℃,氢氧化钙质量分数为6%-11%,单位质量氧化钙的二氧化碳流量为0.08-0.15 L/m in,搅拌速度为200-400 r/m in。在此条件下可以制备粒径为30-80 nm的立方形碳酸钙。
Effects of experimental factors,which included carbonation temperature,mass fraction of Ca（OH）2,flow rate of CO2,shape control agents,and stirring speed,on particle size and morphology of cubic nano-sized calcium carbonate prepared with carbonation method were investigated in a stirring bubbling reactor.Nano-sized calcium carbonate crystal samples were characterized by SEM and XRD.Results showed that mass fraction of Ca（OH）2 and shape control agent were the main effective factors on morphology;and carbonation
temperature,flow rate of CO2 ,and stirring speed were the main effective factors on diameter. Cubic calcium carbonate with diameter of 30 - 80 nm could be prepared, under the optimal carbonation parameters as follows：carbonation temperature was 15 -30 ℃, mass fraction of Ca （OH）2 was 6% - 11%, flow ratio of CO2 per unit mass of CaO was 0.08 -0.15 L/min and stirring speed was 200 -400 r/min.
出处
《无机盐工业》
CAS
北大核心
2009年第12期22-24,共3页
Inorganic Chemicals Industry
关键词
纳米碳酸钙
碳化法
碳化参数
nano-sized calcium carbonate
carbonation method
carbonation parameters
