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http://dx.doi.org/10.9719/EEG.2014.47.5.507

Changes of Mineralogical Characteristics of Asbestos by Heat Treatment  

Jeong, Hyeonyi (Department of Earth and Environmental Sciences, Chonnam National University)
Moon, Wonjin (Korea Basic Science Institute, Gwangju Center)
Yoon, Sungjun (Department of Earth and Environmental Sciences, Chonnam National University)
Kim, Yumi (Department of Earth and Environmental Sciences, Chonnam National University)
Roh, Yul (Department of Earth and Environmental Sciences, Chonnam National University)
Publication Information
Economic and Environmental Geology / v.47, no.5, 2014 , pp. 507-515 More about this Journal
Abstract
Asbestos is designated as carcinogen minerals. Detoxification of asbestos is being conducted by physical and chemical treatments that lead the formation of non-fibrous mineral particles or phase transitions. Major researches have been performed on mineralogical properties of asbestos and possibilities of detoxification in Korea. More specific studies are needed to prove the form and crystal structure changes during the detoxification of asbestos via heat treatment. Therefore, we studied thermal effects on mineralogical characteristics of chrysotile and asbestiform tremolite using electron microscopy investigation. Electron microscopy investigation showed chrysotile fibers were fully transformed into rod-shaped forsterite at $850^{\circ}C$ in 2 hours, and asbestiform tremolite fibers were converted into non-fibrous diopside at $1050^{\circ}C$ in 2 hours. Fibrous asbestos were converted into rod-shaped minerals, which are non-asbestiform. However, compositions of both minerals were not changed before and after heat treatment. These results indicate that thermal treatment of asbestos completely broke down asbestos structure due to dehydroxylation and recrystallization. Thus, electron microscopy investigation can provide the useful information of shapes, crystal structure, and chemistries of the asbestos for the detoxification.
Keywords
asbestos; chrysotile; tremolite; heat treatment; detoxification; electron microscope;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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