ZHAO Hangyi, WANG Yulian, SHI Tianjiao, LIU Jiayi, LIU Yingjie, CHEN Yingjun,ZHANG Rui , WANG Qihao, CHEN Yue, ZHU Yibin, ZHANG Jun

（College of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China）

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

中图分类号： TQ132.2                         文献标志码：A

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。

文章编号：1008-5548（2022）06-0049-09

DOI:10.13732/j.issn.1008-5548.2022.06.006