Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Characteristics of Cement Raw Mix and Clinker used Non-Carbonated Materials

비탄산염 원료를 사용한 시멘트 혼합원료 및 클링커 특성

  • Young Jun Lee (Carbon Neutrality Materials Center, Korea Institute of Ceramic Eng. & Tech) ;
  • Woo Sung Yum (Carbon Neutrality Materials Center, Korea Institute of Ceramic Eng. & Tech) ;
  • Sung Kwan Seo (Carbon Neutrality Materials Center, Korea Institute of Ceramic Eng. & Tech) ;
  • Yong Sik Chu (Carbon Neutrality Materials Center, Korea Institute of Ceramic Eng. & Tech)
  • 이영준 (한국세라믹기술원 탄소중립소재센터) ;
  • 염우성 (한국세라믹기술원 탄소중립소재센터) ;
  • 서성관 (한국세라믹기술원 탄소중립소재센터) ;
  • 추용식 (한국세라믹기술원 탄소중립소재센터)
  • Received : 2023.09.18
  • Accepted : 2023.10.16
  • Published : 2023.10.31
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Abstract

The cement industry emits a large amount of GHGs (greenhouse gases) and about 65% of GHGs is originated from limestone. So non-carbonated CaO materials were examined to replace limestone in this study. It was attempt to replace limestone by used blast furnace slag, converter slag, and KR slag with high CaO content. For manufacture clinker, LSF, SM, and IM were controlled at 92, 2.5, and 1.6, respectively, and the CaCO3 replacement rate was fixed at 3%, 6%, 9%, and 12%. As using blast furnace slag, the CaCO3 replacement rate was possible up to 12%, but for converter slag and KR slag, up to 3% and 9% were possible. The burnability of clinker was better when blast furnace slag and KR slag were used. The XRD peak intensity of clinker used blast furnace slag gradually decreased as the amount of slag used increased, but when KR slag was used, the XRD peak intensity actually increased. It was presumed to be because KR slag has a high CaO content and already contains C2S, making it easier to produce clinker minerals.

시멘트산업은 다량의 온실가스를 배출하고 있으며, 이중 석회석 기인 온실가스가 약 65%를 차지하고 있다. 따라서 본 연구에서는 석회석 대체를 위해 비탄산 CaO 원료를 검토하였다. 특히 제철·제강 부산물 중 CaO 함량이 많은 고로 괴재 슬래그, 전로 슬래그 및 KR 슬래그를 사용하였다. 클링커 제조를 위해 LSF, SM, IM은 각각 92, 2.5, 1.6으로 제어하였으며, CaCO3 대체율은 3%, 6%, 9% 및 12%로 고정하였다. 혼합원료 배합설계 시 고로 괴재 슬래그 사용 조건에서는 CaCO3 대체율이 12%까지 가능하였으나, 전로 슬래그는 3%, KR 슬래그는 9%까지 가능하였다. 클링커의 소성성은 고로 괴재 슬래그 및 KR 슬래그 사용 시 좀 더 양호하였다. 고로 괴재 슬래그 사용 클링커의 XRD 피크 강도는 슬래그 사용량 증가에 따라 점차 감소하였으나, KR 슬래그 사용 시에는 XRD 피크 강도가 오히려 증가하였다. 이는 KR 슬래그의 CaO가 비탄산 성분으로 고함량이며, 이미 C2S를 함유하여 클링커 광물 생성이 좀 더 용이해지기 때문으로 사료되었다.

Keywords

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