无机材料学报2011，Vol.26Issue(11)：1199-1204,6.DOI:10.3724/SP.J.1077.2011.01199
针状碳酸钙制备中氯化镁晶型导向剂的套用研究
Reuse of MgCl2 as Crystal Controlling Agent in the Synthesis Process of Needle-like Calcium Carbonate
马俊 1刘华彦 1陈银飞1
作者信息
- 1. 浙江工业大学化学工程与材料学院,绿色化学合成技术省部共建国家重点实验室培育基地,杭州310014
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摘要
Abstract
MgCl2 was used as crystal controlling agent for the synthesis of regular needle-like calcium carbonate with diameter of 2.5-5μm and aspect ratio of 10-20. Complexometric titrating method was employed to determine the contents of Ca2+ and Mg2+ in filtrated solution after carbonization and the fresh MgCl2 was added to balance the Mg2+ content as same as the raw solution. The morphology, particle size and polymorphs of calcium carbonate were characterized by SEM and XRD. The results show that the content of aragonite phase CaCO3 decreases with the recycle time increasing. When the content of aragonite phase CaCO3 is lower than 80%, the aspect ratio of need-like calcium carbonate decreases significantly companied with the production of calcite cubic CaCO3 particles, thus the filtrated MgCl2 solution is unsuitable to recycled anymore. The direct recycle filtrate can be used for only once while the reused time by the MgCl2 filtrate can reach 12 by optimizing the recycle process through the addition of Mg2+ and the justification of Ph of the filtrate.关键词
针状碳酸钙/氯化镁/络合滴定/套用Key words
needle-like calcium carbonate/ magnesium chloride/ complexometric titration/ reuse分类
化学化工引用本文复制引用
马俊,刘华彦,陈银飞..针状碳酸钙制备中氯化镁晶型导向剂的套用研究[J].无机材料学报,2011,26(11):1199-1204,6.
