无水乙醇辅助下制备无水碳酸镁晶体试验研究  

Experimental study on the preparation of anhydrous magnesium carbonate crystal with the aid of anhydrous ethanol

作　　者：李克卿 王余莲[1,2] 李刚 孙浩然 张一帆 于航欢 胡彦 苏峻樟 韩会丽 张志彬 李孟强 LI Keqing;WANG Yulian;LI Gang;SUN Haoran;ZHANG Yifan;YU Hanghuan;HU Yan;SU Junzhang;HAN Huili;ZHANG Zhibin;LI Mengqiang(School of Materials Science and Engineering,Shenyang Ligong University,Shenyang Liaoning 110159,China;Liaoning Provincial Engineering Research Center for High-Value Utilization of Magnesite,Yingkou Institute of Technology,Yingkou Liaoning 115014,China;China Magnesite Association,Beijing 100036,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]辽宁省菱镁矿高值利用工程研究中心,营口理工学院,辽宁营口115014 [3]中国菱镁行业协会,北京100036

出　　处：《化工矿物与加工》2025年第3期1-9,共9页Industrial Minerals & Processing

基　　金：国家自然科学基金项目(52374271);辽宁省重点研发计划-应用基础研究项目(2022JH2/101300111);沈阳市科技局项目(22-322-3-03);沈阳市中青年科技创新人才支持计划(RC220104);辽宁省菱镁矿高值利用工程研究中心基金项目(LMKK20240101);辽宁省教育厅科研项目(SYLUGXRC+12)。

摘　　要：无水碳酸镁晶体作为一种高附加值无机功能材料,在工业生产领域备受关注。本文以菱镁矿为原料,在无水乙醇辅助下制备无水碳酸镁晶体,设计三因素四水平正交试验确定最佳试验条件,通过粒度分析、X射线衍射(XRD)分析、扫描电镜(SEM)分析等手段对产物进行表征,探究无水乙醇对无水碳酸镁晶体组成和形貌的影响及其合成机理,并计算了合成反应活化能。结果表明:在水热温度200℃、水热时间12 h、无水乙醇与重镁水体积比1∶1的条件下,得到了平均粒径为18.74μm且分散性较好的纯相立方体无水碳酸镁晶体,合成反应活化能为0.573 kJ/mol,无水乙醇促进了无水碳酸镁的生成,减小了晶体表面自由能,提高了反应速率,加速了相转化过程。Anhydrous magnesium carbonate crystals,as a high value-added inorganic functional material,have attracted much attention in the industrial production field.This article used magnesite as raw material to prepare anhydrous magnesium carbonate crystals with the assistance of anhydrous ethanol.A three factor four level orthogonal experiment was designed to determine the optimal experimental conditions.The product was characterized by particle size analysis,X-ray diffraction(XRD)analysis,scanning electron microscopy(SEM)analysis,and other methods to explore the influence of anhydrous ethanol on the composition and morphology of anhydrous magnesium carbonate crystals and their synthesis mechanism.The activation energy of the synthesis reaction was also calculated.The results show that under the conditions of hydrothermal temperature of 200℃,hydrothermal time of 12 h,and a volume ratio of anhydrous ethanol to heavy magnesium water of 1∶1,pure phase cubic anhydrous magnesium carbonate crystals with an average particle size of 18.74μm and good dispersion are obtained.The activation energy of the synthesis reaction is 0.573 kJ/mol.Anhydrous ethanol promote the generation of MgCO_(3),reduce the surface free energy of the crystal,increased the reaction rate,and accelerate the phase transition process.

关 键 词：菱镁矿 无水碳酸镁 无水乙醇 正交试验 粒度分析 相转化 合成反应 

分 类 号：TQ132.2[化学工程—无机化工]