Characteristics of precipitated calcium carbonate by hydrothermal and carbonation processes with mega-crystalline calcite using rotary microwave kiln |
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| Affiliation: | 1. Korea Institute of Limestone and Advanced Materials, Chungbuk 395-903, Republic of Korea;2. Ulimeng Co., Ltd, Chungbuk 373-809, Republic of Korea;3. Korea Institute of Geoscience and Mineral Resources 305-350, Republic of Korea;4. Department of Chemical Engineering of Kwangwoon University, Seoul 139-701, Republic of Korea;5. Department Chemical Engineering of Chungbuk National University, Chungbuk 361-763, Republic of Korea;1. Physical Chemistry Department, Laboratory of Surface Chemistry and Catalysis, National Research Center, Dokki, Cairo, Egypt;2. Zoology Department, College of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia;3. Electron Microscope and Thin Films Department, National Research Center (NRC), El- Behooth Street, Giza 12622, Egypt;1. Department of Environmental Engineering, Konkuk University, Seoul 143-701, Korea;2. Green Technology Co., Ltd., 6F Hanam Venture Tower B/D, ChangWoo-Dong, HaNam-Si 465-120, GyeongGi-Do, Korea;3. Department of Advanced Technology Fusion, Konkuk University, Seoul 143-701, Korea;1. Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, P.O. Box 87317-51167, Iran;2. Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P.O. Box 87317-51167, Iran;1. Department of Environment, Hamedan Branch, Islamic Azad University, Hamedan, Iran;2. Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran;3. Department of Chemistry, Ilam University, Ilam, Iran |
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| Abstract: | In the conventional kiln, mega-crystalline calcite (m-CC) breaks apart easily during calcinations, and cannot be easily converted to CaO due to that it requiring a lot of heat. In this study, m-CC was calcined to CaO of around 1 mm using the rotary microwave kiln. Furthermore, CaCO3 was produced by the carbonation process and hydrothermal process, and the form of CaCO3 was characterized.Calcination of m-CC using the rotary microwave kiln resulted in CaO (97 wt%) of relatively fine size.CaCO3 of colloidal-shaped and 6 μm in size could be prepared by applying the carbonation process to Ca(OH)2 using a bubble reactor at 25 °C. As the carbonation temperature increased from 25 to 80 °C, the shape of prepared CaCO3 changed from a colloidal-type to spindle-type of 1 μm due to self-assembly. Also, hexagonal-shaped aragonite could be prepared by the hydrothermal process with the supersaturated Ca(HCO3)2 solutions. |
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| Keywords: | Mega-crystalline calcite Calcination Rotary microwave kiln Carbonation Hydrothermal |
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