Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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A Study on the Characteristics of Chrysotile and Amosite by Acid and Heat Treatment

산 및 열처리 과정에 따른 주요 석면의 특성변화에 관한 연구

  • Lee, Jin Hyo (Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Lee, Su Hyun (Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Kang, Mi Hye (Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Bae, Il Sang (Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Kim, Ik Soo (Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Han, Kyu Mun (Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Eo, Soo Mi (Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Jung, Kweon (Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment) ;
  • Koo, Ja Yong (Department of Environmental Engineering, University of Seoul)
  • 이진효 (서울특별시보건환경연구원 대기환경연구부) ;
  • 이수현 (서울특별시보건환경연구원 대기환경연구부) ;
  • 강미혜 (서울특별시보건환경연구원 대기환경연구부) ;
  • 배일상 (서울특별시보건환경연구원 대기환경연구부) ;
  • 김익수 (서울특별시보건환경연구원 대기환경연구부) ;
  • 한규문 (서울특별시보건환경연구원 대기환경연구부) ;
  • 어수미 (서울특별시보건환경연구원 대기환경연구부) ;
  • 정권 (서울특별시보건환경연구원 대기환경연구부) ;
  • 구자용 (서울시립대학교 환경공학과)
  • Received : 2015.05.15
  • Accepted : 2015.06.26
  • Published : 2015.06.30
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Abstract

This study is purposed to seek the characteristics of both asbestos in accordance with acid and heat treatment for chrysotile and amosite used mainly as building materials. Results of acid treatment, the refractive index, the elongation sign, the extinction of acid-treated chrysotile were mostly similar to those of untreated chrysotile regardless of pH, elapsed time. But the characteristics of acid-treated chrysotile were different from those of untreated chrysotile after 8 weeks, at pH 1.2 acidic solution. When chrysotile treated with acid, weight ratio (%) of O and Mg fluctuated greatly in accordance with acid treatment unlike Si. But the change of constituents ratio (%) was small as time passed after acid treatment. The refractive index, the elongation sign and the extinction of acid-treated amosite were mostly similar to those of untreated amosite regardless of pH, elapsed time. When amosite was treated with acid, weight ratio (%) of Fe slightly increased. But in case of O, a contrary tendency was seen. Results of heat treatment, the higher the temperature, the more increased the refractive index of chrysotile. When chrysotile was heated for 10 minutes at $1,100^{\circ}C$, the elongation sign of chrysotile changed from positive(+) to negative(-). The extinction of chrysotile didn't change apparently in accordance with heat treatment. Also weight ratio (%) of O and Mg fluctuated greatly in accordance with heat treatment unlike Si. The higher the temperature, the more increased the refractive index of amosite. The elongation sign and the extinction of amosite didn't change apparently in accordance with heat treatment. Also weight ratio (%) of O and Fe fluctuated greatly in accordance with heat treatment. But weight ratio (%) of Si and Mg of heated amosite were mostly similar to those of untreated amosite regardless of temperature, heating time.

본 연구에서는 주로 건축자재에 많이 사용된 백석면과 갈석면을 대상으로 산 및 열처리 과정에 따른 두 석면의 특성변화를 살펴보았다. 연구결과, 산처리 과정에 따른 백석면의 굴절률, 신장부호, 소광특성은 대체로 산처리하지 않은 백석면 초기 특성과 유사하게 나타났지만 pH 1.2의 강한 산성용액에서 8주 경과 후, 미지의 입자가 형성되는 등 백석면 고유의 특성이 소실되었다. 산처리 과정에 따른 백석면 구성성분의 중량비(%)는 규소의 경우, 크게 변하진 않았지만, 산소와 마그네슘의 경우, 중량비(%)가 다소 변동하였다. 갈석면의 경우, 굴절률, 신장부호, 소광특성은 pH 및 경과시간과 상관없이 산처리하지 않은 갈석면과 동일하게 나타났으며, 갈석면 구성성분의 중량비(%)는 철의 경우, 산처리 과정에 따라 다소 증가하는 경향을 보였으며, 산소는 이와 반대로 감소하는 경향을 보였고, 규소와 마그네슘은 산처리 전 후 유사하게 나타났다. 열처리 과정에 따른 백석면 굴절률은 온도가 높아질수록 수평방향, 수직방향의 굴절률이 모두 증가하였으며, 신장부호는 $1,100^{\circ}C$에서 10분간 가열했을 때 (+)에서 (-)로 변하였고, 소광특성은 변하지 않았다. 열처리 과정에 따른 백석면 구성성분의 중량비(%)는 규소의 경우, 중량비(%)는 크게 변하진 않았지만, 산소와 마그네슘의 경우, 온도별 열처리 과정에 따라 중량비(%)가 크게 변동하였다. 갈석면의 경우, 굴절률은 온도가 높아질수록 수평방향, 수직방향 모두 증가하는 경향을 보였으며, 열처리 과정에서 신장부호 및 소광특성은 변하지 않았다. 갈석면 구성성분의 중량비(%)는 산소와 철의 경우, 온도별 열처리 과정에 따라 중량비(%)가 크게 변동하였지만, 규소와 마그네슘은 전반적으로 온도 및 가열시간과 상관없이 열처리하지 않은 갈석면과 유사하게 나타났다.

Keywords

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