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J Korean Soc Environ Eng > Volume 37(6); 2015 > Article
J Korean Soc Environ Eng 2015;37(6): 371-379. doi: https://doi.org/10.4491/KSEE.2015.37.6.371
산 및 열처리 과정에 따른 주요 석면의 특성변화에 관한 연구
이진효1,2, 이수현1, 강미혜1, 배일상1, 김익수1, 한규문1, 어수미1, 정권1, 구자용2
1서울특별시보건환경연구원 대기환경연구부
2서울시립대학교 환경공학과
A Study on the Characteristics of Chrysotile and Amosite by Acid and Heat Treatment
Jin Hyo Lee1,2, Su Hyun Lee1, Mi Hye Kang1, Il Sang Bae1, Ik Soo Kim1, Kyu Mun Han1, Soo Mi Eo1, Kweon Jung1, Ja Yong Koo2
1Atmospheric Research Department, Seoul Metropolitan Government Research Institute of Public Health and Environment
2Department of Environmental Engineering, University of Seoul
Corresponding author  Ja Yong Koo ,Tel: 02-6490-5460, Fax: 02-6490-5465, Email: jykoo@uos.ac.kr
Received: May 15, 2015;  Revised: June 15, 2015;  Accepted: June 26, 2015.  Published online: June 30, 2015.
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℃, 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.
Key Words: Asbestos, Acid Treatment, Heat Treatment, Polarized Light Microscope (PLM), Scanning Electron Microscope (SEM)
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