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Received July 1, 2019
Accepted September 19, 2019
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강산성 양이온 교환수지를 통한 백운석으로부터 CaCO3 및 MgO/Mg(OH)2 합성에 관한 연구
A Study on Synthesis of CaCO3 & MgO/Mg(OH)2 from Dolomite Using the Strong Acidic Cation Exchange Resin
(재)한국석회석신소연구소 연구개발부, 27003 충북 단양군 매포읍 우덕길 18-1
Korea Institute of Limestone and Advanced Materials, 18-1, Udeok-gil, Maepo-eup, Danyang-gun, Chungcheongbuk-do, 27003, Korea
hdj1057@kilam.re.kr
Korean Chemical Engineering Research, December 2019, 57(6), 812-825(14), 10.9713/kcer.2019.57.6.812 Epub 3 December 2019
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Abstract
국내에서 채광되는 백운석(dolomite, CaMg(CO3)2)을 회분식 형태의 마이크로웨이브 소성로(950 °C/60 min)에 의해 소성하여 경소백운석(CaO·MgO)을 제조하였다. 국내에서 산출된 두 개의 백운석 시료를 대상으로 경소백운석 (CaO·MgO) 제조 후 수화 특성을 규명한 결과 반응성이 다름을 규명하였다. 경소백운석(CaO·MgO)의 수화 특성의 반응성을 이용하여 강산성 양이온 교환수지와 반응 시켜서 MgO를 분리하는 조건을 실시하였다. 분리 실험 조건은 경소 백운석(CaO·MgO)과 R-SO3H (1:12 mass %)로 칼슘이온 흡착(Ca-(R-SO3)2)하여 MgO를 분리하였다. 분리 후 MgO의 함량은 94 mass % 이상으로 분리되었다. 분리된 MgO를 950 °C, 60 min 동안 열처리 후 MgO의 순도는 96 mass %로 나타났다. 그리고 칼슘 이온이 흡착된 강산성 양이온 교환수지(Ca-(R-SO3)2)와 NaOH, CO2 gas 반응에 의해서 98 mass %의 CaCO3를 합성하였다.
Two dolomite samples mined from the different mines were calcined using a batch-type microwave kiln (950 oC/60 min) to produce CaO·MgO. The hydration of the CaO·MgO samples shows different reactivity. MgO was separated by reacting with a strong acid cation exchange resin using the reactivity of the hydration properties of light dolomite (CaO·MgO). Calcium (Ca-(R-SO3)2) was separated from the prepared CaO·MgO by the cation exchange resin (CaO·MgO : R-SO3H = 1:12 mass %). High purity MgO (higher than 94 mass %) with unburned CaCO3 (1~2 mass %) was obtained by the separation process. The separated MgO was heated at 950℃ for 60 minutes to afford high purity MgO with MgO content higher than 96%. And High-grade CaCO3 was prepared from the reaction with calcium adsorbed resin (Ca-(R-SO3)2) and NaOH, CO2 gas.
Keywords
References
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