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A Low Temperature Detoxification Method for Treatment of Chrysotile-Containing Waste Roofing Slate

Center for Carbon Mineralization, Climate Change Mitigation and Sustainability Division, Korea Institute of Geoscience and Mineral Resources, 124, Gwahak-ro, Yuseong-gu, Daejeon 34132, Korea
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Minerals 2017, 7(8), 144; https://doi.org/10.3390/min7080144
Received: 14 July 2017 / Revised: 27 July 2017 / Accepted: 8 August 2017 / Published: 10 August 2017
In this study, we evaluated a two-step process for detoxification of waste roofing slate, involving cement hydrate removal and low temperature detoxification using oxalic acid. These treatments were conducted on raw material and intermediate product, respectively. Cement hydrate removal effectively eliminated most Ca-containing cement hydrate components from the raw material under the following conditions: HCl to solid ratio: 0.456 g/g, reaction time: 2 h, and solid to liquid ratio: 0.124 g/mL. Following low temperature (~100 °C) detoxification of intermediate product obtained after cement hydrate removal, chrysotile in waste roofing slate was effectively transformed to Mg-oxalate under conditions of oxalic acid to solid ratio of >0.67 g/g. View Full-Text
Keywords: asbestos; detoxification; oxalic acid; Mg oxalate asbestos; detoxification; oxalic acid; Mg oxalate
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Jo, H.; Jang, Y.N.; Jo, J.H. A Low Temperature Detoxification Method for Treatment of Chrysotile-Containing Waste Roofing Slate. Minerals 2017, 7, 144.

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