회분식 마이크로웨이브 소성로를 활용한 석회석으로부터 탄산칼슘 합성
Synthesis of CaCO3 from Limestone using a Batch-type Microwave Kiln
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
국내 석회석을 에너지효율이 높은 회분식 마이크로웨이브 소성로로 소성하여 CaO를 제조하고, 탄산화 반응과 열수반응으로 침강성탄산칼슘(PCC, precipitated calcium carbonate)을 합성하였다. 탄산화 반응시 수용액 내에서 Ca(OH)2 0.3 M, CO2 가스량 200 cc/분의 조건하에서, pH가 12에서 6까지 변화 될 때 종결하였다. 이 때 합성온도를 25℃에서 80℃로 상승시키면 칼사이트의 결정상인 교질 형태에서 자기 조립에 의한 방추형의 PCC로 합성되었다. 수용액 대신 메탄올용액 내에서 탄산화반응 유도 시 메탄올 용액(H2O:CH3OH(2:8v/v%))의 산도를 pH 12에서 7까지 변화될 때 종결하였으며, 메탄올 용액의 흡입건조방식에 따라 칼사이트의 결정상인 입방형 PCC와 바테라이트의 결정상인 구형 PCC를 합성할 수 있었다. 열수 반응에서는 제조된 교질탄산칼슘 형태의 PCC를 이용하여 Ca(HCO3)2 과포화용액을 제조하고, 끓는물에 방울 크기 2 mm로 투입하여 아라고나이트의 결정상인 육각기둥 형태인 PCC를 합성할 수 있었다.
Abstract
An energy-efficient, batch-type microwave kiln was used to form CaO from domestic limestone. All CaCO3 was converted to CaO, which was used for the synthesis of precipitated calcium carbonate(PCC) through the carbonation and hydrothermal processes. After Ca(OH)2 solution(0.3 M) was prepared, carbonation reactions were ended at pH 6.0 at a flow rate of 200 cc CO2/min. As the preparation temperature increased from 25 to 80℃, the form of PCC changed from colloidal-shaped to spindle-shaped by self assembly of cubic-shaped PCC. In the CaO-(H2O:CH3OH(2:8v/v%))-CO2 system, cubic-shaped and spherical-shaped PCC were prepared by depending on the suction of CH3OH solution. On the other hand, hexagonal-shaped aragonite PCC was prepared by the hydrothermal process. In this process, colloidal-shaped PCC from the carbonation process reacted with CO2 to form supersaturated Ca(HCO3)2 solution. Then, the solution was fed to hot water as liquid droplets(size:2 mm).
참고문헌 (32)
- Bes, A. M., "Process simulation of limestone calcination in normal shaft kilns", 박사, pp.2006
- Clemens, J., "Numerical modeling of materials processing in microwave furnaces", International J. Heat and Mass Transfer, 39(8), pp.1665~1675 (1996)
- Changhong, D., "The synthesis of ultrafine SiC powder by the microwave heating technique", J. of Materials Science, 32, pp.2469~2472 (1997)
- Chatterjee, A., "Analysis of microwave sintering of ceramics", J. AIChE, 44(10), pp.2302~2311 (1998)
- Kyung-Sun Choi, "Formation Mechanism of Aragonite by Substitute of Mg2+ Ions", 한국세라믹학회지, 41(12), pp.4~4 (2004), 한국세라믹학회
- Das, S., "Prospects of microwave processing : an overview", Bull. Mater. Sci, 32(1), pp.1~13 (2009)
- Garcia-Carmona, J., "Morphological characteristics and aggregation of calcite crystals obtained by bubbling CO2 through a Ca(OH)2 suspension in the presence of additives", Powder Technology, 130, pp.307~315 (2003)
- Hua, Z., "Synthesis of needlelike aragonite crystals in the presence of magnesium chloride and their application in papermaking", Advanced Composite Materials, 18, pp.315~326 (2009)
- Hua, Z., "Synthesis of Needlelike Aragonite from Limestone without Calcinations in the Presence of Magnesium Sulfate", Advanced Composite Materials, 18, pp.187~195 (2009)
- Dae Ju Hwang, "Effects of sodium dodecyl benzenesulfonic acid (SDBS) on the morphology and the crystal phase of CaCO_3", The Korean Journal of Chemical Engineering, 28(9), pp.1927~1935 (2011), 한국화학공학회
- Dae Ju Hwang, "Calcination of mega-crystalline calcite using microwave and electric furnaces", Journal of Industrial and Engineering Chemistry, 18(6), pp.1956~1963 (2012), 한국공업화학회
- 한춘, "Preparation of CaCO3 using mega-crystalline calcite in electrical furnace and batch type microwave kiln", Journal of Industrial and Engineering Chemistry, 19(5), pp.1507~1516 (2013), 한국공업화학회[DOI]
- Hwang, D.J., "Synthesis of CaCO3 from natural carbonate minerals using microwave kiln", 박사, Department of Chemical Engineering, pp.2013
- Juvekar, V.A., "Absorption of CO2 in a suspension of lime", Chemical Engineering Science, 28, pp.825~837 (1973)
- Kenkre, V. M., "Theory of microwave interactions in ceramic materials : the phenomenon of thermal runaway", J. Materials Science, 26, pp.2483~2489 (1991)
- Koo, B.K, "Synthesis of calcium carbonate fine powders in Ca(OH)2-C2H5OH-CO2 system", Taejeon National University of Technology, 9(1), pp.539~550 (1992)
- Kristen, H, "Microwave sintering of alumina at 2.45GHz", J. Am. Ceram. Soc, 86(8), pp.1307~1312 (2003)
- Kim, K. H., "Effect of SrCO3 and MgCl2・6H2O addition on synthesis of aragonite in Ca(OH)2-CO2-H2O system at low temperature", Geosystem Engineering, 12(2), pp.45~55 (2009)
- Lee, J.J., "Manufacture of precipitated calcium carbonate from pungchon limestone", J. of Advanced Mineral Aggregate Composites, 21, pp.251~256 (2001)
- Lee, J.J., "Manufacture and dispersion of calcite type calcium carbonate using limestone", J. of Advanced Mineral Aggregate Composites, 7, pp.19~25 (2002)
- Lee, J.J., "Study on the synthesis and characterization of vaterite using limestone", J. of Advanced Mineral Aggregate Composites, 8, pp.19~28 (2003)
- Metaxas, A. C., "Microwave heating", J. Power Engineering, 5(5), pp.237~247 (1991)
- Noh, J.H., "Evaluation method of grade and quality for limestone", J. Miner. Soc. Korea (Mineral & industry), 15(1), pp.1~14 (2002)
- Ohutama Kogyo Co., ltd., "Hollow columnar calcium carbonate and method of manufacturing the same, JP patent, 200,282", ~ (2005)
- Ohutama Kogyo Co., ltd., "Tubular calcium carbonate", JP patent, 176,776, ~ (2007)
- Park, J.L., "Effect of temperature on the formation of vaterite in Ca(OH)2-CH3OHH2O- CO2 System", J. of the Korean Ceramic Society, 39(12), pp.1143~1148 (2002)
- 박진구, "Ca(OH)2 alc Na2CO3 수용액의 균일침전 반응에 의한 아라고나이트 침강성 탄산 칼슘의 합성", 한국결정성장학회지, 14(3), pp.110~114 (2004), 한국결정성장학회
- Panda, S.S., "Sintering response of austenitic(316L) and ferritic(434L) stainless steel consolidated in conventional and microwave furnaces", Scripta Materialia, 54, pp.2179~2183 (2006)
- Sung, I.Y., "A study on manufacture of precipitated calcium carbonate used the pungchon limestone", J. of Advanced Mineral Aggregate Composites, 4, pp.71~104 (1999)
- Shin, B.C., "Preparation of colloidal calcium carbonate by carbonation process", 석사, Department of Chemical Engineering, pp.2001
- Siddarth, G., "Comparison of solid-State microwave annealing with conventional furnace annealing of ionimplanted SiC", J. Electronic Materials, 36(4), pp.423~331 (2007)
- Zhao, C., "Hybrid sintering with a tubular susceptor in a cylindrical single-mode microwave furnace", Acta Mater, 48, pp.3795~3801 (2000)