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化工学报  2015 

碳酸氢钠调控五水碳酸镁的合成

DOI: 10.11949/j.issn.0438-1157.20141032, PP. 164-170

Keywords: 结晶,五水碳酸镁,动力学控制,颗粒过程,化学反应

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Abstract:

在NaHCO3调控作用下,通过MgCl2和Na2CO3反应结晶合成了五水碳酸镁(MgCO3·5H2O)。利用SEM、XRD和TG等技术,结合反应结晶过程中镁离子浓度变化,研究了工艺参数对结晶过程和产物影响。实验结果表明,合成五水碳酸镁过程中极易生成MgCO3·3H2O副产物。纯MgCO3·5H2O制备工艺条件为:NaHCO3加入量≥3.00g·L-1,碳酸钠加料速率2~50ml·min-1,合成温度0~5.0℃。所合成的五水碳酸镁呈棱柱状形貌,晶体表面光滑,尺寸20~160μm。分析表明,添加碳酸氢钠促进了结晶动力学,同时基团对三水碳酸镁晶体的形成具有位阻效应,但有利于五水碳酸镁晶体形成,产生晶型调控的协同效果。工艺参数的改变将使得结晶过程发生热力学和动力学控制的转换,影响结晶产物的晶型晶貌。

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