Repurposing of the Industrial Hydrated Lime in Storing Carbon Dioxide and Producing Calcium Carbonate

This study addresses the effect of storing carbon dioxide conditions using industrial hydrated lime on the produced calcium carbonate morphology and particle size. The investigated carbonation conditions were carbonation reaction temperature and initial pH. The structural and chemical characteristics of the produced calcium carbonate sample were investigated using X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and Raman spectroscopy. The results indicated that all carbonated products exhibited a calcite crystal structure, but with specific morphologies dependent on the carbonation conditions. A high carbonation reaction temperature promoted scalenohedral morphology, while lower temperatures promoted submicrometric elongated agglomerates and truncated prismatic morphology. The initial pH of the carbide lime mixture also significantly affected the morphology; the formation of a rhombohedral morphology was obtained at a pH value of 10.9, and the presence of rhombohedral and submicrometric elongated agglomerates was determined at pH values of 11.75 and 12.7, respectively.