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http://dx.doi.org/10.9713/kcer.2019.57.6.812

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

Hwang, Dae Ju (Korea Institute of Limestone and Advanced Materials)
Yu, Young Hwan (Korea Institute of Limestone and Advanced Materials)
Publication Information
Korean Chemical Engineering Research / v.57, no.6, 2019 , pp. 812-825 More about this Journal
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.
Keywords
Dolomite; Strong acidic cation exchange resin; Hydration; Calcium carbonate; Magnesium hydroxide;
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