The effect of microwave on the crystallization process of magnesium carbonate from aqueous solutions

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Zhichao Guo
  • Wenxiang Han
  • Wenli Zhao
  • Liye Li
  • Baodong Wang
  • Yongfeng Xiao
  • Ville Alopaeus

Research units

  • Tianjin University of Science & Technology
  • National Institute of Clean-and-Low-Carbon Energy

Abstract

The effect of microwave on reactive crystallization is investigated with magnesium carbonate as the working substance. In the experiments, magnesium carbonate is precipitated by mixing aqueous magnesium sulfate and sodium carbonate solutions in a MSMPR crystallizer located in a microwave reactor. A population balance model along with crystallization kinetics is formulated to assess the influence of microwave energy input on nucleation, growth, agglomeration and breakage during crystallization process. A general high order moment method of classes (HMMC) framework is applied to solve the model numerically. The results show that crystallization kinetics parameters, including the nucleation rate constant (kn), the growth rate constant (kg), the exponent of growth rate (g) and the collision efficiency (Ψag) change significantly due to mass transfer enhancement in microwave field. Meanwhile, the exponent of nucleation (n) and the breakage rate constant (kbr) remain constant or only change slightly. It is further discovered that the crystal suspension attenuates the microwave effect during crystallization process.

Details

Original languageEnglish
Article number1
Pages (from-to)358-366
Number of pages9
JournalPowder Technology
Volume328
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

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