Effects of CO2 Bubble Size, CO2 Flow Rate and Calcium Source on the Size and Specific Surface Area of CaCO3 Particles

Energies

Jun-Hwan Bang²  Kyungsun Song²  Sangwon Park²  Chi Wan Jeon²  Seung-Woo Lee²  Wonbaek Kim¹ 

[1] Korea Institute of Geoscience and Mineral Resources, 124 Gwahak-ro, Yuseong-gu, Daejeon 305350, Korea;

关键词: carbonate mineralization;    CO₂ fixation;    CaCO₃;    particle size;    specific surface area;    microbubble;   

DOI  :  10.3390/en81012304

来源: mdpi

【 摘 要 】

The effects of CO₂ flow rate and calcium source on the particle size (PS) and specific surface area (SSA) of CaCO₃ particles were evaluated using microbubble generator (MBG) and air diffuser (AD) systems. The carbonate mineralization (CM) and precipitated calcium carbonate (PCC) methods were employed to produce CaCO₃ using gypsum and Ca(OH)₂ as the calcium sources, respectively. The CaCO₃ particles prepared using the MBG were smaller (with larger specific surface area) than those obtained using the conventional AD, regardless of the calcium source. The average PSs were 2–3 and 7–9 μm for the MBG and AD systems, respectively. Moreover, the PS and SSA of the particles prepared using the MBG were not greatly affected by the CO₂ injection rate. This study clearly demonstrates that the use of an MBG ensures the stable production of fine CaCO₃ particles using various calcium sources and a wider range of CO₂ flow rates.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.