A method of removing metal ions from silicate glasses for recycling by liquid-phase deposition

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3 Citations (Scopus)

Abstract

A method of removing metal ions from silicate glasses for recycling was studied. This method utilizes a liquid-phase deposition (LPD) technique using a hydrofluosilicic acid (H2SiF6) aqueous solution supersaturated with silica. Silicate glass powder prepared from a glass bottle was dissolved in aqueous hydrofluoric acid (HF) solution. The fluorinated silicon oxide (SiOF) separated from the H2SiF6, and then an LPD-SiOF gel was formed in the supersaturated H2SiF6 aqueous solution. Almost all ratios of metals to silicon (Si) were reduced by at least one order of magnitude. The LPD-SiOF powder formed by drying the LPD-SiOF gel at 23 °C showed a different chemical bonding structure than that of the initial silicate glass powder. The LPD-SiOF powder showed a cluster structure of spheres 1-2 μm in diameter. A possible mechanism for removal of the non-Si primary component metal oxides and other impurity metal ions is proposed. The features of this method and a possible application for recycled silica are also discussed.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalJournal of Non-Crystalline Solids
Volume291
Issue number1-2
DOIs
Publication statusPublished - 2001 Oct 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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