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A Study on Synthesis of CaCO3 & MgO/Mg(OH)2 from Dolomite Using the Strong Acidic Cation Exchange Resin

강산성 양이온 교환수지를 통한 백운석으로부터 CaCO3 및 MgO/Mg(OH)2 합성에 관한 연구

  • Hwang, Dae Ju (Korea Institute of Limestone and Advanced Materials) ;
  • Yu, Young Hwan (Korea Institute of Limestone and Advanced Materials)
  • 황대주 ((재)한국석회석신소재연구소 연구개발부) ;
  • 유영환 ((재)한국석회석신소재연구소 연구개발부)
  • Received : 2019.07.01
  • Accepted : 2019.09.19
  • Published : 2019.12.01

Abstract

Two dolomite samples mined from the different mines were calcined using a batch-type microwave kiln ($950/60min^{\circ}C$) to produce $CaO{\cdot}MgO$. The hydration of the $CaO{\cdot}MgO$ 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 ($CaO{\cdot}MgO$). Calcium ($Ca-(R-SO_3)_2$) was separated from the prepared $CaO{\cdot}MgO$ by the cation exchange resin ($CaO{\cdot}MgO:R-SO_3H=1:12mass%$). High purity MgO (higher than 94 mass %) with unburned $CaCO_3$ (1~2 mass %) was obtained by the separation process. The separated MgO was heated at $950^{\circ}C$ for 60 minutes to afford high purity MgO with MgO content higher than 96%. And High-grade $CaCO_3$ was prepared from the reaction with calcium adsorbed resin ($Ca-(R-SO_3)_2$) and NaOH, $CO_2$ gas.

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