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http://dx.doi.org/10.22807/KJMP.2020.33.4.407

Inactivation of Asbestos-Containing Slate Using High-Temperature Plasma Reactor  

Yoon, Sungjun (Chonnam National University Center for Asbestos and Environment)
Jeong, Hyeonyi (Chonnam National University Center for Asbestos and Environment)
Park, Byungno (Chonnam National University Center for Asbestos and Environment)
Kim, Yongun (Chonnam National University Center for Asbestos and Environment)
Kim, Hyesu (Chonnam National University Center for Asbestos and Environment)
Park, Jaebong (Chonnam National University Center for Asbestos and Environment)
Son, Byungkoo (Cheorwon Plasma Research Institute)
Kim, Taewook (Cheorwon Plasma Research Institute)
Mun, Youngbum (Sungshin Cement)
Lee, Sundong (Sungshin Cement)
Lee, Jaeyun (Sungshin Cement)
Roh, Yul (Chonnam National University Center for Asbestos and Environment)
Publication Information
Korean Journal of Mineralogy and Petrology / v.33, no.4, 2020 , pp. 407-417 More about this Journal
Abstract
The capacity of the designated landfill site for asbestos-containing waste is approaching its limit because the amount of asbestos-containing slate is increasing every year. There is a need for a method that can safely and inexpensively treat asbestos-containing slate in large capacity and at the same time recycle it. A cement kiln can be an alternative for heat treatment of asbestos-containing slate. We intend to develop a pilot scale device that can simulate the high temperature environment of a cement kiln using a high temperature plasma reactor in this study. In addition, this reactor can be used to inactivate asbestos in the slate and to synthesize one of the minerals of cement, to confirm the possibility of recycling as a cement raw material. The high-temperature plasma reactor as a pilot scale experimental apparatus was manufactured by downsizing to 1/50 the size of an actual cement kiln. The experimental conditions for the deactivation test of the asbestos-containing slate are the same as the firing time of the cement kiln, increasing the temperature to 200-2,000℃ at 100℃ intervals for 20 minutes. XRD, PLM, and TEM-EDS analyses were used to characterize mineralogical characteristics of the slate before and after treatment. It was confirmed that chrysotile [Mg3Si2O5(OH)4] and calcite (CaCO3) in the slate was transformed into forsterite (Mg2SiO4) and calcium silicate (Ca2SiO4), a cement constituent mineral, at 1,500℃ or higher. Therefore, this study may be suggested the economically and safely inactivating large capacity asbestos-containing slate using a cement kiln and the inactivated slate via heat treatment can be recycled as a cement raw material.
Keywords
Asbestos; Asbestos-containing slate; Plasma; Calcium silicate; Recycle;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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