Korean Journal of Mineralogy and Petrology (광물과 암석)

The Petrological Society of Korea & The Mineralogical Society of Korea (한국암석학회 & 한국광물학회)
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Transformation Characteristics of Calcined Oyster Shell to Liquid Lime

소성된 굴패각의 액상소석회로의 전환 특성

  • Ha, Su Hyeon (School of Earth System Sciences, Kyungpook National University) ;
  • Kim, Yeongkyoo (School of Earth System Sciences, Kyungpook National University)
  • 하수현 (경북대학교 지구시스템과학부) ;
  • 김영규 (경북대학교 지구시스템과학부)
  • Received : 2020.08.06
  • Accepted : 2020.09.28
  • Published : 2020.09.30
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Abstract

There have been many studies on the calcination of oyster shells in the perspective of recycling of resources. The quicklime made by the calcination of oyster shells is used either as it is or after reacting with water to transform to liquid lime before being used. However, the liquid lime made from calcined oyster shells show slightly different properties from that of limestone. In this study, to compare these properties of oyster shell with those of limestone, the samples were calcined and reacted with water at various temperatures to transform to a liquid lime and filtered using 150 ㎛ sieves to calculate the transform rate to liquid lime. The calcined limestone was transformed to liquid lime at all temperatures, but calcined oyster shell did not show any transformation at 30℃ and 50℃ under the experimental conditions of this study, and rather increased the weight for the remaining after filtration due to the presence of Ca(OH)2 produced by the reaction with water, Even at 90℃, the transformation rate of calcined oyster shell to liquid lime was lower than that of limestone. This difference in oyster shell can be explained partly by the preventing calcined one from reacting with water by conchiolin which is protein found in the prismatic and pearl layers of oyster shell. Conchiolin is also known to be stable and does not decompose even at high temperature. However, even the calcined chalk layer without conchiolin shows lower transformation rate than that of calcined limestone, probably due to the small amount of Na in oyster shell, which may cause additional reaction including eutectic melt during calcination process.

자원의 재활용 관점에서 굴패각의 소성에 관한 연구가 많이 진행되고 있다. 굴패각을 소성시켜 만들어진 생석회는 건식으로 사용되기도 하고 물과 반응을 시켜 액상소석회로 변환시킨 뒤 사용되기도 한다. 그러나 굴패각은 석회석과는 약간 다른 소성 및 액상소석회 변화의 특성을 보여준다. 본 연구에서는 굴패각과 이를 비교하기 위한 석회석을 소성시켜 생석회를 만든 후 이를 다양한 온도의 물과 반응시켜 액상소석회로 변환 실험을 실시하였다. 액상소석회로 변환 후 150 ㎛의 체를 이용하여 거르고 액상소석회로의 전환률을 계산하였다. 소성된 석회석은 모든 온도에서 액상소석회로 전환되었다. 그러나 굴패각의 경우 본 연구의 실험조건 중 30℃와 50℃에서 액상소석회로 변환되지 않고 오히려 물과의 반응을 통하여 만들어진 Ca(OH)2의 존재로 질량이 증가하였으며 90℃에서도 석회석 보다는 낮은 액상소석회 전환률을 보여주었다. 굴패각에서 보여주는 이러한 차이는 굴패각의 각주층과 진주층에서 발견되는 단백질의 일종인 콘키올린이 높은 온도에서도 분해되지 않아 물과의 반응을 감소시켜 생기는 결과로 일부 설명할 수 있다. 그러나 콘키올린이 존재하지 않는 초크층에서도 석회석 보다 액상소석회의 변화률이 낮음을 보여준다. 이것은 석회석에는 거의 존재하지 않으나 굴패각에서 미량으로 존재하는 Na에 의하여 소성 시 패각의 방해석이 공융용융체 형성과 같은 추가적인 반응에 의한 것으로 생각된다.

Keywords

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