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굴 패각의 소성 조건에 따른 소석회의 특성과 외부용 수성 도료 적용 연구
황대주,유영환,한창수,이종대,Hwang, Dae Ju,Yu, Young Hwan,Han, Chang Soo,Lee, Jong Dae 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.4
CaO was prepared by calcining for oyster shells using a microwave kiln. It was analyzed to Ca(OH)<sub>2</sub> synthed on hydration reaction from prepared CaO. The synthesized Ca(OH)<sub>2</sub> 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)<sub>2</sub> was synthesized through hydration. Hydration conditions of the prepared CaO were (a) CaO : H<sub>2</sub>O(100 g : 200 g) and (b) CaO : H<sub>2</sub>O(100 g : 400 g). As a result of the hydration reaction, it was confirmed as low reactivity. 100 wt% of Ca(OH)<sub>2</sub> was synthesized. In particular, Ca(OH)<sub>2</sub> synthesized under the hydration condition of (a) was analyzed in a plate shape. An external water paint was formulated with Ca(OH)<sub>2</sub> 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.