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Studies on the Preparation of Precipitated Calcium Carbonate(I) : Formation and Transformation of Amorphous Calcium Carbonate
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침강성탄산칼슘의 제조에 관한 연구(I) : 비정질탄산칼슘의 생성과 전이

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Type
Academic journal
Author
Ha, Ho (인하대학교 공과대학 화학공학과) Park, Seung-Soo (인하대학교 공과대학 화학공학과) Lee, Hee-Cheol (인하대학교 공과대학 화학공학과)
Journal
The Korean Society Of Industrial And Engineering Chemistry 공업화학 공업화학 제3권 제3호 KCI Accredited Journals
Published
1992.1
Pages
522 - 526 (5page)

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Studies on the Preparation of Precipitated Calcium Carbonate(I) : Formation and Transformation of Amorphous Calcium Carbonate
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Carbonation process of an aqueous solution of $Ca(OH)_2$ with $CO_2$ gas at $10^{\circ}C$ has been studied to investigate the formation and transformation processes of amorphous calcium carbonate. It was suggested that the amorphous calcium carbonate consisting of spherical particles with the diameter in the range of $0.02{\sim}0.05{\mu}m$ be a non-stoichiometric $CaCO_3$ phase containing small amounts of $H_2O$ and small incorporations of $HCO^-_3$. Amorphous $CaCO_3$ is unstable in the aqueous solution and converts to calcite, and its morphology depends on the carbonate species present in the slurry such that with [$CO_3^{2-}$] prevailing, chain-like calcite composed of ultrafine colloidal particles and with [$HCO^-_3$] prevailing, rhombohedral particles of calcite are formed respectively. Therefore, morphological control of calcium carbonate crystals could be expected by the adequate controls of transformation process of the amorphous calcium carbonate.

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