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J. Korean Ceram. Soc. > Volume 51(2); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(2): 107.
doi: https://doi.org/10.4191/kcers.2014.51.2.107
Factors Affecting the Crystal Growth of Scalenohedral Calcite by a Carbonation Process
Thenepalli Thriveni, Namil Um1, Seong-Young Nam, Young Jun Ahn2, Choon Han2, Ji Whan Ahn
Mineral Processing Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)
1Environmental Resources Research, National Institute of Enveronmental Research (NIER)
2Department of Chemical Engineering, Kwangwoon University
ABSTRACT
In the present work, we report a novel microstructure of scalenohedral calcite synthesized without any additives by a simple and ecofriendly carbonation process carried out in a liquid-gas system as well as the effects of experimental conditions on the crystal growth of the scalenohedral calcite phase. Various process parameters, pH, temperature, $Ca(OH)_2$ concentration, $CO_2$ flow rates, and the total volume concentration, were investigated to enhance the sensitivity of the process. The highest average length of the scalenohedral calcite was obtained at pH 6.0, temperature of $45^{circ}C$, $Ca(OH)_2$ concentration of 0.2M, $CO_2$ flow rate of 80mL/min, and total volume of 1L. The synthesized calcite was characterized by XRD, SEM, and FTIR to identify the phases and surface morphology.
Key words: Synthesis, Scalenohedral calcite, Carbonation process, Applications, $CO_2$ gas
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