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http://dx.doi.org/10.9713/kcer.2021.59.4.611

A Study on the Characteristics of Manufactured Mg Crown on the Calcining Conditions of Dolomite  

Hwang, Dae Ju (Advanced Materials Team, Korea Institute of Limestone and Advanced Materials)
Yu, Young Hwan (Advanced Materials Team, Korea Institute of Limestone and Advanced Materials)
Lee, Jong Dae (Department Chemical Engineering of Chungbuk National University)
Publication Information
Korean Chemical Engineering Research / v.59, no.4, 2021 , pp. 611-625 More about this Journal
Abstract
Mg crowns were manufactured using domestic dolomite (Ca·Mg(CO3)2) (20~30 mm). In order to manufacture the calcined dolomite (CaO·MgO), (a) electric furnace (950 ℃, 480 min) and (b) microwave furnace (950 ℃, 60 min) processes were used. As a result of XRD analysis, it was analyzed as (a) CaO 56.9 wt%, MgO 43.1 wt% by electric furnace process and (b) CaO 55 wt%, MgO 45 wt% by microwave furnace process. Even when the decarbonation reaction time of dolomite was shortened by 1/8 in microwave furnace process compare with electric furnace process, the calcined dolomite could be produced. The hydration reaction (ASTM C 110) is a standard for the hydration reactivity of calcined dolomite, and the calcined dolomite produced by electric furnace process showed a high hydration reactivity (max temp 79.8 ℃/1.5 minutes). Such hydration reactivity was occurred by only CaO hydration reaction and that was confirmed by XRD analysis. The calcined dolomite produced by microwave furnace process showed low hydration reactivity (max temp 81.7 ℃/19.5 minutes). Such low hydration reactivity was occurred by CaO and MgO hydration reaction due to the hydration reaction of CaO thereafter occurring of the hydration reaction of MgO, and that was confirmed by XRD analysis. The prepared Mg crown were 58.8 g and 74.6 g by electric furnace and microwave furnace processes, respectively, under the reaction conditions of 1,230 ℃, 60 min, 5 × 10-2 torr by silicothermic reduction.
Keywords
Dolomite; Calcined dolomite; Microwave heating; Silicothermic reduction reaction; Mg crown;
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