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http://dx.doi.org/10.9713/kcer.2022.60.4.594

A Study on the Characteristics of Ca(OH)2 According to the Calcination Conditions of Oyster Shells and Its Application for Exterior Water Paints  

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)
Han, Chang Soo (Migam Co., Ltd)
Lee, Jong Dae (Department of Chemical Engineering, Chungbuk National University)
Publication Information
Korean Chemical Engineering Research / v.60, no.4, 2022 , pp. 594-605 More about this Journal
Abstract
CaO was prepared by calcining for oyster shells using a microwave kiln. It was analyzed to Ca(OH)2 synthed on hydration reaction from prepared CaO. The synthesized Ca(OH)2 was formulated as an external water paint. Oyster shells (325 mesh, 43 ㎛) were decarbonized for (a) 950 ℃/1 hr and (b) 1,150 ℃/1 hr to prepare CaO. In the calcination condition of (a), CaO was 56.7 wt%, and in the calcination condition of (b), CaO was 100 wt%. To compare CaO by calcination of oyster shells with that of limestone, limestone (25~30 mm) was decarbonized at 950 ℃/1 hr to prepare CaO, and as a result of the analysis(XRD), it was analyzed as CaO 100 wt%. CaO was prepared under the calcining conditions of oyster shells (b) 1,150 ℃/1 hr, and Ca(OH)2 was synthesized through hydration. Hydration conditions of the prepared CaO were (a) CaO : H2O(100 g : 200 g) and (b) CaO : H2O(100 g : 400 g). As a result of the hydration reaction, it was confirmed as low reactivity. 100 wt% of Ca(OH)2 was synthesized. In particular, Ca(OH)2 synthesized under the hydration condition of (a) was analyzed in a plate shape. An external water paint was formulated with Ca(OH)2 synthesized from oyster shells as the main component. When 15 items of the external water paint standard specification (KS M 6010) were analyzed, it was confirmed that all other criteria were satisfied except for freezing stability.
Keywords
Oyster shell; Microwave kiln; Calcination; Calcium hydroxide; Exterior water paint;
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Times Cited By KSCI : 1  (Citation Analysis)
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