碳化法制备球霰石碳酸钙微球及形成机理

doi:10.11962/1006-4990.2020-0230

Abstract

Abstract:

The monodispersed pure vaterite microspheres were synthesized by disperse bubbling carbonization using the reaction system of CaCl₂-NH₃-H₂O and characterized by SEM,FE-SEM,TEM and XRD.The effects of several factors such as the initial pH,final pH,initial reaction temperature and flow rate of CO₂ gas on the morphology and particle size of products were investigated.The formation mechanism of vaterite microspheres was also discussed.The experiment results demonstrate that much more CO₂ bubbles with uniform size are produced by dispersed bubbling carbonization which can increase the supersaturation of CO₂ in solution compared with the direct bubbling carbonization.It is helpful to prepare monodisperse vaterite microspheres with high purity.Low initial temperature and high flow rate of CO₂ gas also improve the produce of vaterite.The optimum conditions are as follows: initial pH of 10.0,final pH of 7.0,flow rate of CO₂ gas of 1 L/min.

Key words: dispersed bubble carbonization, vaterite, synthesis, formation mechanism

CLC Number:

TQ132.32

Zhao Li,Zhuo Minquan,Gong Fuzhong,Wang Jun,Ruan Heng,Li Kaicheng,Li Yanlin. Synthesis of vaterite CaCO₃ microspheres by carbonization method and its formation mechanism[J]. Inorganic Chemicals Industry, 2021, 53(3): 38-43.

Figures/Tables 10

References 36

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Inorganic Acid-Base-Salt Committee of CIESC

Synthesis of vaterite CaCO₃ microspheres by carbonization method and its formation mechanism

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Synthesis of vaterite CaCO3 microspheres by carbonization method and its formation mechanism