Potential of cockle shell and oyster shell in producing precipitated calcium carbonate
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Date
2019-07
Authors
Zafirah Binti Zainuddin
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Abstract
The research was conducted in order to synthesize and characterize precipitated calcium carbonate (PCC) based on cockle shell and oyster shell at selected/pre-determined operating conditions. The cockle shell and oyster shell used as starting material and needs to be prepared involving three main processes which are calcination, slaking and recarbonation. The operating variables that control the PCC synthesis such as temperature , stirring rate , pH and flow rate of carbon dioxide gas. The starting material and PCC produced was characterized based on its presence in morphology structure , composition of element , particle size distribution , decomposition of CaCO3 and mineral phase using FESEM-EDX , MasterSizer (Dry Method) , and XRD respectively. 40 °C , 60 °C and 80 °C were being chosen to study the effect of temperature on chemical content of elemental analysis , morphology structure, carbonation period , particle size distribution and polymorph. The morphology from PCC-40° C shows cubic-like rhombohedral calcite while other PCC-60 °C and PCC-80° C shows the spherical calcite. The higher the temperature perform on synthesizing PCC , the shorter the recarbonation period. Low temperature provide small and fine particles. Most of PCC from cockle shell indicate calcite and vaterite in their polymorph.