碳酸镁水合物在283～363K范围内的晶体组成及晶型  

Composition and Morphology of Magnesium Carbonate Hydrates Synthesized by the Reaction of MgSO_4 with Na_2CO_3 in 283～363K

作　　者：邵平平[1] 李志宝[2] 密建国[1] 

机构地区：[1]北京化工大学化工学院,北京100029 [2]中国科学院过程工程研究所绿色过程与工程重点实验室,北京100190

出　　处：《过程工程学报》2009年第3期520-525,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:20876161);国家重点基础研究发展规划(973)基金资助项目(编号:2007CB613501)

摘　　要：研究了由MgSO4和Na2CO3在283-363K反应沉淀得到的碳酸镁水合物的组成和形貌随反应温度的变化规律，并对产品进行了表征.结果表明，在283-313K间，可得到棒状三水碳酸镁（MgCO3·3H2O）；当温度升高到323K时，产物由棒状三水碳酸镁变为球形碱式碳酸镁，且随着反应温度升高，球形碱式碳酸镁的直径增大.MgSO4的初始浓度和Na2CO3滴加速率对三水碳酸镁晶体形貌有明显的影响.Precipitation of various forms of magnesium carbonate hydrates was investigated by the reaction of MgSO4 with Na2CO3 at the temperatures from 283 to 363 K. XRD and SEM analysis showed that the reaction temperature had great effect on the morphology of precipitate. Three morphologies, needle-like, spherical-like and sheet-like, were obtained. The needle-like nesquehonite （MgCO3·3H2O） was synthesized from 283 to 313 K. When the temperature was below 303 K, the crystals obtained exhibited a smooth surface, with the increase of reaction temperature to 313 K, the needle-like particles displayed coarse surface covered by little rod-like crystals. When the temperature was up to 323-363 K, the spherical-like crystals were obtained, and with the temperature increasing, the diameter of crystals increased. The initial concentration of MgSO4 and Na2CO3 titration speed had also significant effect on crystal morphology of nesquehonite.

关 键 词：三水碳酸镁 碱式碳酸镁 晶体组成 晶体形貌 反应温度 

分 类 号：TQ132.2[化学工程—无机化工]