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Experiments and Modeling of the Preparation of Ultrafine Calcium Carbonate in Spouted Beds
with Inert Particles

LIN Cheng; ZHU Tao; ZHU Yuezi; ZHANG Jiyu   

  1. Department of Chemical Engineering, Fuzhou University, Fuzhou,350002, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-12-28 Published:2003-12-28
  • Contact: LIN Cheng

惰性粒子喷动床中制备超细碳酸钙的实验与建模

林诚; 朱涛; 朱跃姿; 张济宇   

  1. Department of Chemical Engineering, Fuzhou University, Fuzhou,350002, China
  • 通讯作者: 林诚

Abstract: A novel reaction-drying process was carried out in a spouted bed reactor with inert
particles and used to prepare ultrafine CaCO3 particles. Effects of concentrations of CO2
and Ca(OH)2, and reaction temperature on Ca(OH)2 conversion were experimentally
investigated. The particle sizes and composition of CaCO3 produced were characterized with
transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results indicated
that ultrafine CaCO3 particles with mean size of 80 nm could be obtained with this novel
process.By modifying the Arrhenius Equation and considering the Ca(OH)2 state, a kinetic
model was established to describe the process in the spouted bed. The model parameters
estimated from the reaction-drying experiments were found to fit well the experimental
data, indicating the applicability of the proposed kinetic model.

Key words: ultrafine CaCO3 particles, preparation, spouted bed, inert particles, reaction and drying, modeling

摘要: A novel reaction-drying process was carried out in a spouted bed reactor with inert
particles and used to prepare ultrafine CaCO3 particles. Effects of concentrations of CO2
and Ca(OH)2, and reaction temperature on Ca(OH)2 conversion were experimentally
investigated. The particle sizes and composition of CaCO3 produced were characterized with
transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results indicated
that ultrafine CaCO3 particles with mean size of 80 nm could be obtained with this novel
process.By modifying the Arrhenius Equation and considering the Ca(OH)2 state, a kinetic
model was established to describe the process in the spouted bed. The model parameters
estimated from the reaction-drying experiments were found to fit well the experimental
data, indicating the applicability of the proposed kinetic model.

关键词: ultrafine CaCO3 particles;preparation;spouted bed;inert particles;reaction and drying; modeling