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

무해화된 폐석면에 함유된 유가금속 회수 기술 개발

  • 김동년 (국민대학교 응용화학과) ;
  • 양동현 (국민대학교 응용화학과) ;
  • 김석찬 (국민대학교 응용화학과)
  • Received : 2020.07.09
  • Accepted : 2020.07.27
  • Published : 2020.08.10

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.

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