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

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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

Fingerprint

Silicates
recycling
Metal ions
Recycling
silicates
metal ions
liquid phases
Powders
Glass
glass
Liquids
Silicon Dioxide
Gels
Metals
Silica
Glass bottles
gels
Hydrofluoric Acid
silicon dioxide
aqueous solutions

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

A method of removing metal ions from silicate glasses for recycling by liquid-phase deposition. / Homma, Tetsuya.

In: Journal of Non-Crystalline Solids, Vol. 291, No. 1-2, 10.2001, p. 25-31.

Research output: Contribution to journalArticle

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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.",
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