摘要
将腐植酸添加到氢氧化钙碳化制备碳酸钙的体系中,成功合成了比表面积大于50m2/g的碳酸钙.采用BET方法测定了样品的比表面积和孔分布情况,利用XRD和SEM方法原位检测了反应过程中粒子形貌及其成分的变化过程,发现腐植酸在改变碳酸钙产品比表面积的同时还能改变其微晶形貌,随着腐植酸用量加大,碳酸钙粒子形貌由类球状变为棒状,而后变为立方形.根据SEM和XRD测试结果分析了该实验现象的机理.
Humic acid （HA） was utilized as additive to prepare calcium carbonate particles via the carbonizing reaction between Ca（OH）2 and CO2. The powder with high specific surface area over 50 m^2/g was prepared. BET method was used to analyze the BET specific surface area and pore-size distribution of the as-made products. XRD and SEM analysis was employed to investigate the morphology and composition of the calcium carbonate particles in the reaction process. The results show that humic acid could increase the specific surface area and change the crystal morphology at the same time. Morphology of the calcium carbonate fine particles graduated from sphere-like into rod-like, and then into cubic-like shape. A proposed mechanism based on the results of SEM and XRD analysis was developed to explain the phenomena.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2006年第2期219-222,共4页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20221603)
关键词
碳酸钙
腐植酸
高比表面积
形态控制
calcium carbonate
humic acid
high specific surface area
morphology control
