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J. Korean Ceram. Soc. > Volume 41(12); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(12): 889.
doi: https://doi.org/10.4191/kcers.2004.41.12.889
Formation Mechanism of Aragonite by Substitute of Mg2+ Ions
Kyung-Sun Choi, Jin-Koo Park, Ji-Whan Ahn, Hwan Kim1
Korea Institute of Geoscience and Mineral Resources
1School of Materials Science and Engineering, Seoul National University
ABSTRACT
Acicular type aragonite precipitated calcium carbonate was synthesized by carbonation reaction of $Ca(OH)_2$ slurry and $CO_2$ gas. As increasing the initial concentration of $Mg^{2+}$ ion, calcite crystal phase substantially decreased while that of aragonite crystal phase increased. According to XRD and EDS analysis, it was found that the addition of $MgCl_2$ induced the $Mg^{2+}$ ion to substitute in $Ca^{2+}$ ion site of calcite lattice then the unstabled calcite structure be resolved, consequently the growth of calcite structure is interrupted while the growth of aragonite structure is expedited.
Key words: Precipitated calcium carbonate, Aragonite, Carbonation process, Magnesium ion
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