Recycle of ceria-based glass polishing powder using NaOH solution

Kazuhiro Kato, Toshiaki Yoshioka, Akitsugu Okuwaki

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Recycle of ceria-based glass polishing powder was investigated. A waste polishing powder was treated in a 4 mol kg-1 NaOH solution with a waste/NaOH weight ratio of 1 at 60 °C, and SiO2 and Al2O3 impurities were dissolved into the solution and removed from the polishing powder. A solution which containing the impurities was heated to 100 °C, and hydroxysodalite (Na8(AlSiO4)6(OH)24H2O) was precipitate. Thus the glass polishing powder can be regenerated and hydroxysodalite was obtained as a by-product, and excess NaOH solution was reused. However addition of Si source, such as sodium silicate was required to control the leaching and precipitation process.

Original languageEnglish
Pages (from-to)725-732
Number of pages8
JournalUnknown Journal
Issue number10
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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