以白云石为原料氨碱法制备球霰石及其生成机理研究  

Study on preparation of vaterite from dolomite by ammonia-alkali method and its mechanism

作　　者：范天博 贾晓辉 韩冬雪 陈思 姜宇 胡婷婷 郭洪范 李莉 刘云义 Fan Tianbo;Jia Xiaohui;Han Dongxue;Chen Si;Jiang Yu;Hu Tingting;Guo Hongfan;Li Li;Liu Yunyi(Liaoning Provincial Key Laboratory of Chemical Application Technology,College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;College of Computer Science and Technology,Shenyang University of Chemical Technology)

机构地区：[1]沈阳化工大学化学工程学院,辽宁省化工应用技术重点实验室,辽宁沈阳110142 [2]沈阳化工大学计算机科学与技术学院

出　　处：《无机盐工业》2021年第5期56-60,共5页Inorganic Chemicals Industry

基　　金：国家自然基金(61102041);辽宁省高校创新团队支撑计划(2013010);国家科技支撑计划(2013BAB09B01);辽宁省教育厅项目(L2013169);辽宁省精细化工协同创新中心资助项目;辽宁省自然基金(201602582);辽宁省自然科学基金指导计划项目:基于涡致振动的宽带压电能量收集结构研究(2019-ZD-0075)。

摘　　要：采用仿Solvay氨碱法,以白云石为起始原料,在碱性环境下制备出高球霰石含量的碳酸钙。XRD和SEM表征结果显示,碳化温度为20~40℃时的产品为球霰石;40~60℃时的产品为方解石;60~90℃时的产品为文石。球霰石的高倍SEM发现产品有许多微孔结构,对产品进行比表面积测定为32.653 m^(2)/g,孔径为2.972 nm,为生物分子的装载提供了良好的空间。对球霰石的形成机理分析表明,NH_(4)^(+)-NH3缓冲体系不仅可以增加碳酸钙的过饱和度,还可以改善溶液环境,为球霰石的生长提供了一个良好的溶液环境,溶液中微量的Mg^(2+)起到了促进完好晶型形成的作用。Calcium carbonate with high content of vaterite was prepared by imitating Solvay ammonia-alkali method with dolomite as starting material in alkaline environment.The results of XRD and SEM showed that the product with carbonization temperature of 20~40℃was vaterite,40~60℃was calcite and 60~90℃was aragonite.The high magnification SEM of vaterite showed that the product had many microporous structures.The specific surface area of the product was determined to be 32.653 m^(2)/g and the pore size was 2.972 nm.It provides a good space for the loading of biomolecules.The analysis of the formation mechanism of vaterite showed that the NH_(4)^(+)-NH3 buffer system could not only increase the supersaturation of calcium carbonate in the solution,but also improve the solution environment and provide a good solution environment for the growth of vaterite.The trace amount of Mg^(2+)in the solution played a role in promoting the formation of intact crystal forms.

关 键 词：白云石 缓冲体系 球霰石 碳酸钙 

分 类 号：TQ132.32[化学工程—无机化工]