Preparation of CaCO3 using mega-crystalline calcite in electrical furnace and batch type microwave kiln

Dae Ju Hwang; Jae Yong Ryu; Jung Ho Park; Young Hwan Yu; Moon Kwan Choi; Kye Hong Cho; Ji Whan Ahn; Choon Han; Jong Dae Lee

Journal of Industrial and Engineering Chemistry, Vol.19, No.5, 1507-1516, September, 2013

DOI10.1016/j.jiec.2013.01.017 Export Citation

Preparation of CaCO3 using mega-crystalline calcite in electrical furnace and batch type microwave kiln

Dae Ju Hwang^{1, 2}, Jae Yong Ryu³, Jung Ho Park³, Young Hwan Yu¹, Moon Kwan Choi¹, Kye Hong Cho¹, Ji Whan Ahn¹, Choon Han^{4, †}, and Jong Dae Lee²

¹Korea Institute of Limestone and Advanced Materials, Chungbuk 395-903, Republic of Korea
²Department Chemical Engineering, Chungbuk National University, Chungbuk 361-763, Republic of Korea
³Ulimeng Co., Ltd., Chungbuk 373-809, Republic of Korea
⁴Department of Chemical Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea

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Mega-crystalline calcite (m-CC) breaks apart easily during calcination, and cannot be easily converted to CaO due to its characteristic that requires massive heat consumption. To solve this problem, the calcination characteristics were compared using electrical furnace (EF) and batch type microwave kiln (BM). After hydrating the manufactured CaO, Ca(OH)2 was produced, and through the carbonation process, CaCO3 was synthesized. The results of the XRD pattern of CaO that was formed through calcinations indicated that decarbonation reaction occurred as 98.2 wt.% by EF for 240 min, and 97.8 wt.% by BM for 30 min at the same temperature of 950 ℃. Hydration results revealed that CaO by EF was high-reactive whereas CaO by BM was medium-reactive. CaCO3 was synthesized through the carbonation process. At 25 ℃, in both cases, colloidal-shaped CaCO3 was found, and the more spindle-shaped CaCO3 by cubic-shaped self assembly was synthesized at higher temperatures. However, in case of EF, Ca(OH)2 existed in products.

Keywords:Mega-crystalline calcite;Calcinations;Hydration;Carbonation;Microwave;Microwave kiln

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Lee JJ, Park JL, Journal of Advanced Mineral Aggregate Composites., 7, 19 (2002)
Sung IY, Oum JH, Journal of Advanced Mineral Aggregate Composites., 4, 71 (1999)
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[27] Panda SS, Singh V, Upadhyaya A, Scripta Materialia., 54, 2179 (2006)

[28] Dai CH, Zhang XP, Zhang JS, Yang YJ, Cao LH, Fei X, J. Mater. Sci., 32(9), 2469 (1997)

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