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http://dx.doi.org/10.7844/kirr.2015.24.4.22

Formation Behavior of Precipitated Calcium Carbonate Polymorphs by Supersaturation  

Ahn, Young jun (Department of Chemical Engineering, Kwangwoon University)
Jeon, ong Hyuk (Department of Chemical Engineering, Kwangwoon University)
Lee, Shin Haeng (Department of Chemical Engineering, Kwangwoon University)
Yu, Young Hwan (Department of Chemical Engineering, Kwangwoon University)
Jeon, Hong Myeong (Department of Chemical Engineering, Kwangwoon University)
Ahn, Ji Whan (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Han, Choon (Department of Chemical Engineering, Kwangwoon University)
Publication Information
Resources Recycling / v.24, no.4, 2015 , pp. 22-31 More about this Journal
Abstract
From results obtained by adjusting experimental variables based on the kinetic, the nucleation rate for formation of precipitated calcium carbonate (PCC) was investigated. Formation behavior of PCC was investigated for various concentrations of NaOH solution and $Na_2CO_3$ addition methods in the $Ca(OH)_2$ slurry. The range of nucleation rate was investigated for dissolution rates of major ion concentrations, $Ca^{2+}$ and $CO{_3}^{2-}$. In case of high concentration of major ions, vaterite and calcite were synthesized. The high nucleation rate was achieved for lower either $Ca^{2+}$ or $CO{_3}^{2-}$ ion concentration, calcite was mainly synthesized and when concentration of major ions was low, aragonite was synthesized. Furthermore, the formation of calcite was decreased with increasing concentration of NaOH. homogeneous aragonite could be obtained by addition 5 M NaOH. Therefore, in this study, specific shape of polymorphs could be prepared through controlling supersaturation.
Keywords
precipitated calcium carbonate; solution process; nucleation rate; supersaturation; NaOH;
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