高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

三水碳酸镁在限域旋混反应器中的结晶优化

程文婷,李智婷,翟颖   

  1. 山西大学资源与环境工程研究所
  • 收稿日期:2025-08-01 修回日期:2025-10-07 网络首发:2025-10-09 发布日期:2025-10-09
  • 通讯作者: 程文婷 E-mail:wtcheng@sxu.edu.cn
  • 基金资助:
    国家自然科学基金青年项目（批准号：22208198）和中央引导地方科技发展资金项目（批准号：YDZJSX2025D012）资助

Optimization of crystallization of nesquehonite in the confined swirling reactor

CHENG Wenting, LI Zhiting, ZHAI Ying   

  1. Institute of Resources and Environmental Engineering, Shanxi University
  • Received:2025-08-01 Revised:2025-10-07 Online First:2025-10-09 Published:2025-10-09
  • Contact: Wenting Cheng E-mail:wtcheng@sxu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China (Grant No.22208198) and the Central Guidance Fund for Local Science and Technology Development (Grant No.YDZJSX2025D012)

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摘要： 由于三水碳酸镁（MgCO3·3H2O）在制备时易发生团聚无序现象以致形貌尺寸不可控，导致其性能大幅下降而不能满足应用需求。针对此问题，本文以MgCl2·6H2O和Na2CO3为反应物，采用限域旋混反应器来制备MgCO3·3H2O晶体，并通过研究反应器转速与定转子间隙对所制备MgCO3·3H2O晶体尺寸的影响来优化操作参数。首先，对限域空间流场中的雷诺数Re、物料混合时间tm、成核诱导期tind、Kolmogorov尺度ηk等参数进行了模拟计算。计算结果表明在反应器转速为3000~5000 rpm、定转子间隙为0.2~0.5 mm时，物料流动状态以湍流为主且在MgCO3·3H2O成核之前物料就已经充分混合，限域旋混反应器可有效强化物料传质过程。然后在各个转速和定转子间隙下进行了MgCO3·3H2O的制备实验，结果发现在反应器转速为3000 rpm、定转子间隙为0.2 mm时，可生成粒度分布窄、体积平均粒径为8.919 μm的MgCO3·3H2O晶体。为了进一步量化操作参数对MgCO3·3H2O晶体尺寸的影响，分别计算了晶体体积平均粒径d43对反应器转速和定转子间隙的偏弹性，结果发现晶体体积平均粒径d43对定转子间隙的偏弹性更大，即MgCO3·3H2O晶体尺寸对定转子间隙的改变更敏感。

关键词: 三水碳酸镁, 限域旋混反应器, 粒度分布, 理论分析

Abstract: MgCO3·3H2O crystal was prone to agglomeration and disorder during its preparation, resulting in uncontrollable morphology and size. This issue led to a significant decrease in its performance and could not meet the application requirements. In this paper, MgCl2·6H2O and Na2CO3 were used as reactants, and a confined swirling reactor was employed to prepare MgCO3·3H?O crystal to address this issue. The operating parameters were optimized by investigating the effects of reactor rotation speed and stator-rotor gap on the morphology and size of the prepared MgCO3·3H?O crystal. Firstly, parameters such as Reynolds number (Re), material mixing time (t?), nucleation induction period (tind), and Kolmogorov length scale (ηk) in the confined space flow field were simulated. The calculation results showed that when the reactor rotation speed was 3000~5000 rpm and the stator-rotor gap was 0.2~0.5 mm, the material flow state was mainly turbulent, and the reaction materials were fully mixed before the nucleation of MgCO3·3H?O. The mass transfer process of materials could be effectively enhanced in the confined swirling reactor. Subsequently, experiments on the preparation of MgCO3·3H?O were carried out under various reactor rotation speeds and stator-rotor gaps. The results showed that when the reactor rotation speed was 3000 rpm and the stator-rotor gap was 0.2 mm, the MgCO3·3H?O crystal was prepared with a narrow particle size distribution and a volume-average particle size of 8.919 μm. To further quantify the influence of operating parameters on the size of MgCO3·3H?O crystal, the partial elasticity of its volume-average particle size with respect to the reactor rotation speed and the stator-rotor gap was calculated respectively. It was found that the partial elasticity of the volume-average particle size with respect to the stator-rotor gap was larger than to the reactor rotation speed, which meant that the size of MgCO3·3H?O crystals was more sensitive to the change of stator-rotor gap.

Key words: Nesquehonite, Confined swirling reactor, Particle size distribution, Theoretical analysis

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