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异丙醇催化碱式碳酸镁晶体的合成
作者:王余莲1 2 印万忠3  昂3 欧昌锐4 张夏翔4  静1 刘嘉琦1 董斯琳1  阳1 
单位:(1. 沈阳理工大学材料科学与工程学院 沈阳 110159 2. 矿物加工科学与技术国家重点实验室 北京 100160  3. 东北大学资源与土木工程学院 沈阳 110819 4. 湖南大学材料科学与工程学院 长沙 410082) 
关键词:菱镁矿 异丙醇 碱式碳酸镁 热解法合成 
分类号:TD989
出版年,卷(期):页码:2019,47(7):0-0
DOI:
摘要:

 以菱镁矿为原料、异丙醇为添加剂,采用水化碳酸化法-直接热解法合成了碱式碳酸镁晶体(4MgCO3•Mg(OH)2•4H2O)。利用X射线衍射仪和扫描电子显微镜探究了热解温度、异丙醇添加量、热解时间对产物的物相组成和形貌的影响,并通过动力学分析计算了合成反应活化能。结果表明:当异丙醇与Mg(HCO3)2溶液的体积比为2:1,热解时间为120 min时,在50 ℃合成了平均直径为1.0 μm,平均长度为10 μm,表面带绒毛的棒状4MgCO3•Mg(OH)2•4H2O晶体;4MgCO3•Mg(OH)2•4H2O热分解温度范围为150~700 ℃,分3个阶段进行,分解产物为MgO、H2O和CO2;合成反应活化能为1.330 7 kJ/mol,异丙醇降低了亚稳相水合碳酸镁向稳定相4MgCO3•Mg(OH)2•4H2O转变所需要的能量,加速了低温环境下的相转化进程。

 Hydromagnesite (4MgCO3•Mg(OH)2•4H2O) crystals were synthesized via hydration and carbonation treatment and direct pyrolysis with magnesite as a raw material and isopropanol as an additive. The influences of the pyrolysis temperature, dosage of isopropanol and pyrolysis time on the phase composition and morphology of products were investigated. The structure and shape of the as-prepared samples were examined by X-ray diffraction and scanning electron microscopy. The activation energy of the reaction was calculated through the kinetic analysis. The results show that the rod-like hydromagnesite crystals with a fluff and average diameter of 1.0 μm and average length of 10 μm are obtained when the volume ratio of isopropanlo to Mg(HCO3)2 solution is 2:1, pyrolysis temperature is 50 ℃, and pyrolysis time is 120 min. The thermal decomposition of hydromagnesite is carried out through three processes within 150?700 ℃, and the decomposed products are MgO, H2O and CO2. The activation energy of pyrolysis process assisted with isopropanlo is 1.330 7 kJ/mol. Isopropanol reduces the energy required to covert the metastable hydrated magnesium carbonate to the stable hydromagnesite, and accelerates the phase transformation process at low temperatures.

基金项目:
国家自然科学基金(51804200);矿物加工科学与技术国家重点实验室开放基金(BGRIMM-KJSRL-2019-14);辽宁省自然科学基金博士启动基金(20180540104);国家级大学生创新创业训练计划(201710144008);辽宁省大学生创新创业训练计划(201810144041)。
作者简介:
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