Korean Chemical Engineering Research

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

굴 패각의 소성 조건에 따른 소석회의 특성과 외부용 수성 도료 적용 연구

  • 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)
  • 황대주 ((재)한국석회석신소연구소, 첨단소재팀) ;
  • 유영환 ((재)한국석회석신소연구소, 첨단소재팀) ;
  • 한창수 ((주)미감) ;
  • 이종대 (충북대학교 화학공학과)
  • Received : 2022.04.20
  • Accepted : 2022.06.20
  • Published : 2022.11.01
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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.

마이크로웨이브 소성로를 이용하여 굴 패각을 소성하여 CaO 제조하였다. 제조된 CaO를 수화 반응시켜서 Ca(OH)2를 분석하였다. 합성한 Ca(OH)2를 주성분으로하여 외부용 수성 도료 배합하였다. 굴 패각(325 mesh, 43 ㎛)은 (a) 950 ℃/1 시간와 (b) 1,150 ℃/1 시간 동안 탈탄산화반응을 시켜 CaO를 제조하였다. (a)의 소성 조건에서는 CaO 56.7 wt%이고 (b)의 소성 조건에서는 CaO 100 wt%였다. 굴 패각의 소성에 의한 CaO를 석회석의 경우와 비교하기 위하여 석회석(25~30 mm)을 950 ℃/1 시간 동안 탈탄산화 반응시켜서 CaO를 제조하였으며, XRD 분석 결과 CaO 100 wt%로 분석 되었다. 굴 패각의 소성 조건인 (b) 1,150 ℃, 1시간으로 CaO를 제조하여 수화 반응을 통하여 Ca(OH)2를 합성하였다. 제조된 CaO의 수화 조건은 (a) CaO : H2O(100 g : 200 g)과 (b) CaO : H2O(100 g : 400 g)로 수화 반응성을 실시하였다. 수화 반응 결과, 저 반응성으로 확인 되었다. 100 wt%의 Ca(OH)2를 합성하였다. 특히 (a)의 수화 조건에서 합성한 Ca(OH)2는 판상형으로 분석되었다. 굴 패각으로 합성한 Ca(OH)2를 주성분으로 외부용 수성 도료를 배합하였다. 외부용 수성 도료 표준 규격(KS M 6010)의 15개 항목에 대하여 분석하였을 때 냉동안정성을 제외한 다른 모든 기준에 적합한 것을 확인하였다.

Keywords

Acknowledgement

본 연구는 (주)미감의 수탁연구과제 지원비(2021)로 수행하였으며, 이에 감사드립니다.

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