Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Characteristics Analysis of Chlorine Bypass Dust and Water- washed Residue

염소 바이패스 분진 및 수세 잔류물의 특성분석

  • Sun-Mok Lee (Jungwoo Materials. Co., Ltd.) ;
  • Daekeun Lee (Jungwoo Materials. Co., Ltd.) ;
  • Jun-Ho Kil (Ssangyong C&E Technology Research Center) ;
  • Taewoo Lee (Ssangyong C&E Technology Research Center) ;
  • Hun Song (Carbon Neutral Materials Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Woo Sung Yum (Carbon Neutral Materials Center, Korea Institute of Ceramic Engineering & Technology)
  • 이선목 ((주)정우소재) ;
  • 이대근 ((주)정우소재) ;
  • 길준호 (쌍용C&E 기술연구소) ;
  • 이태우 (쌍용C&E 기술연구소) ;
  • 송훈 (한국세라믹기술원 탄소중립소재센터) ;
  • 염우성 (한국세라믹기술원 탄소중립소재센터)
  • Received : 2023.09.26
  • Accepted : 2023.10.13
  • Published : 2023.10.31
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Abstract

The main components of chlorine bypass dust are calcium, alkali, and chlorine. Chlorine components must be removed from chlorine bypass dust to enable its recycling as a cement raw material. Cement companies usually employ water-washing treatment to recover KCl from chlorine bypass dust. In this study, the chemical composition, mineral properties, and microstructure of the chlorine bypass dust and washed residues obtained from a 35,000 ton/year chlorine-bypass-dust-washing facility were analyzed to determine the feasibility of recycling the dust and its washed residues. The chlorine content of the dust decreased from 23.9% to 1.4% after washing, thus confirming the possibility of using the washed residues as a cement raw material. The CaO component increased from 22.4% to 49.8% whereas the K2O component decreased from 25.2% to 5.45%. The average particle diameter of the water-washed residues was 22.72 ㎛, which was significantly higher than that of the chlorine bypass dust before washing (12.13 ㎛). This result was attributed to the dissolution of chlorine compound particles measuring less than 1 ㎛ in the chlorine bypass dust during washing.

염소 바이패스 분진의 주성분은 칼슘, 알칼리 및 염소 성분이며, 시멘트 원료로 재활용하기 위하여 염소 성분 제거가 필요하다. 시멘트 업체에서는 염소 바이패스 분진의 시멘트 원료 사용과 KCl 회수를 위해서 수세 처리를 진행하고 있다. 본 연구에서는 염소 바이패스 분진 및 수세 잔류물의 재활용 가능성을 파악하기 위해서 35,000톤/년 규모 염소 바이패스 분진 수세 설비에서 사용한 염소 바이패스 분진과 수세 잔류물의 화학성분, 광물 특성 및 미세구조를 분석하였다. 염소 바이패스 분진의 염소 함량은 23.9%에서 수세 처리 후에 1.4%로 감소하여 수세 잔류물의 시멘트 원료 사용 가능성을 확인하였다. 수세 잔류물에서의 염소 성분은 대부분 Calcium Aluminium Oxide Chloride Hydrate 광물 형태로 존재하고 있음을 확인하였다. CaO 성분은 22.4%에서 49.8%로 증가하였으며, K2O 성분은 25.2%에서 5.45% 감소하였다. 수세 잔류물의 평균입경은 22.72㎛로 수세 전의 염소 바이패스 분진의 평균입경 12.13㎛와 비교하여 크게 증가한 것을 알 수 있는 데, 이것은 염소 바이패스 분진에 포함되어있는 1㎛ 이하의 염소화합물 입자가 수세 과정에서 용해되었기 때문인 것으로 판단되었다.

Keywords

Acknowledgement

본 연구는 기획재정부 재원으로 탄소혁신스타즈프로젝트사업(1415184331) 및 산업통산자원부 탄소중립산업핵심기술개발사업(RS-2023-00265662)의 연구비지원을 받아 수행되었습니다.

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