赵航毅, 王余莲, 时天骄, 刘珈伊, 刘英杰, 陈滢珺, 张 瑞, 王琪浩, 陈 月, 朱益斌, 张 俊
(沈阳理工大学材料科学与工程学院, 辽宁沈阳110159)
DOI:10.13732/j.issn.1008-5548.2022.06.006
收稿日期: 2022-05-09, 修回日期:2022-07-17,在线出版时间:2022-11-01。
基金项目:国家自然科学基金项目,编号:51804200;国家级大学生创新创业训练计划项目,编号:202010144005。
第一作者简介:赵航毅(2000—),男,研究方向为微纳米碳酸镁系化合物制备。E-mail: 1500704556@qq.com。
通信作者简介:
王余莲(1986—),女,副教授,博士,硕士生导师,研究方向为矿物材料的制备及应用。E-mail: ylwang0908@163.com。
时天骄(1997—),男,硕士研究生,研究方向为微纳米碳酸镁系化合物制备。E-mail: michaelstj@163.com。
摘要:以菱镁矿为初始原料,经煅烧、水化、碳化、热解获得棒状三水碳酸镁前驱体,并以三水碳酸镁和氯化铵(NH4Cl)为原料,采用水热法制备无水碳酸镁晶体,探索水热温度、水热时间及固液质量比对产物物相组成和微观形貌的影响及形成机理。结果表明:NH4Cl浓度为0.5 mol/L、水热温度为170℃、水热时间为11 h、固液质量比为1∶30时,可获得平均直径为2~5μm的菱块状无水碳酸镁晶体。水热反应期间,添加剂NH4Cl水解产生的H+加速无水碳酸镁的形成。
关键词:三水碳酸镁;无水碳酸镁;水热法;氯化铵
Abstract:Using magnesite as the initial raw material, the rod-shaped nesquehonite precursor was obtained by a calcination-hydration-carbonization-pyrolysis method. Using nesquehonite and NH4Cl as raw materials, anhydrous magnesium carbonate crystals were prepared by hydrothermal method. The effects of hydrothermal temperature, hydrothermal time and solid-to-liquid mass ratio on the physical phase composition and microscopic morphology of the products were explored, and the formation mechanism was further investigated. The results show that when the concentration of NH4Cl is 0.5 mol/L, the hydrothermal temperature is 170 ℃, the hydrothermal time is 11 h and the solid-to-liquid ratio is 1∶30, rhombic anhydrous magnesium carbonate crystals with average diameters of 2~5 μm can be obtained. During the hydrothermal reaction, the H+ produced by ammonium chloride hydrolysis accelerate the formation of anhydrous magnesium carbonate.
Keywords:nesquehonite; anhydrous magnesium carbonate; hydrothermal method; ammonium chloride
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