Polymorph and morphology of CaCO3 in relation to precipitation conditions in a bubbling system

doi:10.1016/j.cjche.2016.12.004

Abstract

Abstract: Simulating the typical carbonation step in a mineral CO₂ sequestration, precipitated calcium carbonate (PCC) was prepared by bubbling CO₂ gas into a rich Ca solution. These carbonation reactions were conducted at three pH ranges, namely 10.0-9.0, 9.0-8.0, and 8.0-7.0, in which temperature and CO₂ flow rate are additional experimental variables. The PCC obtained in experiments was examined by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). It was found that supersaturation determined by pH value and flow rate of CO₂ has significant influence on polymorph of PCC. Vaterite was preferably formed at high supersaturation, while dissolution of metastable vaterite and crystallization of calcite occurred at low supersaturation. High temperature is a critical factor for the formation of aragonite. At 70℃, vaterite, calcite and aragonite were observed to coexist in PCC because transformation from vaterite to aragonite via calcite occurred at this temperature. Scanning electron microscopy (SEM) technology was performed on prepared PCC, and various morphologies consistent with polymorphs were observed.

Key words: Precipitated calcium carbonate, Rich Ca solution, Bubbling CO₂, pH range, Polymorph, Morphology

摘要： Simulating the typical carbonation step in a mineral CO₂ sequestration, precipitated calcium carbonate (PCC) was prepared by bubbling CO₂ gas into a rich Ca solution. These carbonation reactions were conducted at three pH ranges, namely 10.0-9.0, 9.0-8.0, and 8.0-7.0, in which temperature and CO₂ flow rate are additional experimental variables. The PCC obtained in experiments was examined by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). It was found that supersaturation determined by pH value and flow rate of CO₂ has significant influence on polymorph of PCC. Vaterite was preferably formed at high supersaturation, while dissolution of metastable vaterite and crystallization of calcite occurred at low supersaturation. High temperature is a critical factor for the formation of aragonite. At 70℃, vaterite, calcite and aragonite were observed to coexist in PCC because transformation from vaterite to aragonite via calcite occurred at this temperature. Scanning electron microscopy (SEM) technology was performed on prepared PCC, and various morphologies consistent with polymorphs were observed.

关键词: Precipitated calcium carbonate, Rich Ca solution, Bubbling CO₂, pH range, Polymorph, Morphology

Jian Sun, Lisheng Wang, Dongfang Zhao. Polymorph and morphology of CaCO₃ in relation to precipitation conditions in a bubbling system[J]. , 2017, 25(9): 1335-1342.

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Polymorph and morphology of CaCO₃ in relation to precipitation conditions in a bubbling system

Polymorph and morphology of CaCO₃ in relation to precipitation conditions in a bubbling system

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