Recycle of ceria-based glass polishing powder using NaOH solution

Citation
K. Kato et al., Recycle of ceria-based glass polishing powder using NaOH solution, NIP KAG KAI, (10), 2000, pp. 725-731
Citations number
2
Language
GIAPPONESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
NIPPON KAGAKU KAISHI
ISSN journal
0369-4577 → ACNP
Issue
10
Year of publication
2000
Pages
725 - 731
Database
ISI
SICI code
0369-4577(200010):10<725:ROCGPP>2.0.ZU;2-W
Abstract
Recycle of ceria-based glass polishing powder was investigated. A waste pol ishing powder was treated in a 4 mol kg(-1) NaOH solution with a waste/NaOH weight ratio of I at 60 degreesC, and SiO2 and Al2O3 impurities were disso lved into the solution and removed from the polishing powder. A solution wh ich containing the impurities was heated to 100 degreesC, and hydroxysodali te (Na-8(AlSiO4)(6)(OH)(2)4H(2)O) 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 central the leaching and precipitation p rocess.