| Precipitated CaCO3 with Unique Crystalline Morphology
Prepared from Limestone |
Zaenal Arifin, Agus Riyanto, Qudsiyyatul Lailiyah, Triwikantoro, Suminar Pratapa and Darminto*
pages : 202-207
DOI : 10.1080/0371750X.2015.1084892 |
| Abstract |
| A carbonation method has been applied to induce the precipitation reaction of calcium carbonate powders with
unique morphology. The reaction was strongly influenced by temperature, pH, CO2 gas flow rate and flow duration.
Characterization of the as-prepared CaCO3 by XRD and SEM demonstrated that the vaterite phase was mostly
formed at low temperature and CO2 gas flow rate. Phase transformation from vaterite to calcite phases at room
temperature was initiated by the formation of calcite structure in ¼ spherical shapes and was followed by
transformation to the rhombic structure. The highest growth of calcite structure, resulting in purity up to 98.6%,
occurred at the CO2 gas flow rate of 5 SCFH in 36 s. Aragonite particles were produced at CO2 gas flow rate of 0.5
and 5 SCFH to yield 99.2% and 72.3% phase purities, respectively, with needle-like morphology at a higher
temperature of 85oC. Furthermore, the reaction with lower CO2 gas flow rate (2 SCFH) led to the formation of
aragonite with a flower-like morphology. |
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