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http://dx.doi.org/10.14478/ace.2020.1048

Development of Technology for Recovering Valuable Metals in Detoxified Waste Asbestos-Containing Waste  

Kim, Dong Nyeon (Department of Applied Chemistry, Kookmin University)
Yang, Dong Hyeon (Department of Applied Chemistry, Kookmin University)
Kim, Seok Chan (Department of Applied Chemistry, Kookmin University)
Publication Information
Applied Chemistry for Engineering / v.31, no.4, 2020 , pp. 438-442 More about this Journal
Abstract
Studies on the recovery conditions and optimization process for valuable metal recovery through chemical treatment from detoxified asbestos-containing waste composed of calcium silicate, larnite, merwinite, and akermanite were conducted. The main components, Si, Ca, and Mg, of detoxified asbestos-containing waste (DACW) were separated and recovered in the form of SiO2, CaSO4, and Mg(OH)2 compounds, respectively. Each separated component was confirmed through X-ray diffraction (XRD) and inductively coupled plasma spectrometer (ICP) analysis. The recovery conditions for each component were first treating them with an acid to separate SiO2 and subsequently with H2SO4 to recover Ca in the form of sulfate, CaSO4. The remaining Mg was recovered by precipitation with Mg(OH)2 under strong basic conditions. This study suggested that it is possible to convert existing treatment process of asbestos waste by landfill through recovering the components into a resource-recycling green technology.
Keywords
Asbestos; Detoxified asbestos-containing waste (DACW); Valuable metals; XRD;
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Times Cited By KSCI : 8  (Citation Analysis)
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