화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.20, No.5, 2727-2734, September, 2014
DOI10.1016/j.jiec.2013.10.061  Export Citation
Characteristics of precipitated calcium carbonate by hydrothermal and carbonation processes with mega-crystalline calcite using rotary microwave kiln
Dae Ju Hwang, Jae Yong Ryu1, Young Hwan Yu, Kye Hong Cho, Ji Whan Ahn2, Choon Han3, †, and Jong Dae Lee4
  • Korea Institute of Limestone and Advanced Materials, Chungbuk 395-903, Republic of Korea
  • 1Ulimeng Co., Ltd, Chungbuk 373-809, Republic of Korea
  • 2Korea Institute of Geoscience and Mineral Resources, 305-350, Republic of Korea
  • 3Department of Chemical Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea
  • 4Department Chemical Engineering, Chungbuk National University, Chungbuk 361-763, Republic of Korea
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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 mm in size could be prepared by applying the carbonation process to Ca(OH)2 using a bubble reactor at 25 8C. As the carbonation temperature increased from 25 to 80 ℃, the shape of prepared CaCO3 changed from a colloidal-type to spindle-type of 1 mm due to self-assembly. Also, hexagonal-shaped aragonite could be prepared by the hydrothermal process with the supersaturated Ca(HCO3)2 solutions.
Keywords:Mega-crystalline calcite;Calcination;Rotary microwave kiln;Carbonation;Hydrothermal
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