Preparation and properties of glass-ceramics from wastes (Kira) of silica sand and kaolin clay refining

Tomohiro Toya, Yoshikazu Kameshima, Atsuo Yasumori, Kiyoshi Okada

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


Glass-ceramics were prepared from wastes generated from refining of silica sand and kaolin clay, called Kira. Several kinds of Kira were melted at 1300-1550 °C with additions of CaCO3 and quenched in air or water to obtain glasses. The quenched glasses were ground to <48 mesh and used to prepare glass-ceramics. Crystallization of the parent glass occurred above 950 °C, producing wollastonite as a major crystalline phase which gradually transformed to pseudowollastonite above 1150 °C. The macroscopic appearance of the samples changed from transparent pale green glass to smooth-textured shiny white upon crystallization. The thermal expansion coefficient of the glass-ceramics was 5.2×10-6/°C (30-380 °C). The four-point bending strengths of the as-fired glass-ceramics ranged from 76 to 86 MPa. Vickers microhardness was found to be 6.6-7.5 GPa. Since the chemical durability for acid and alkali was excellent in these glass-ceramics, they are considered to be candidates for applications such as building materials, ceramic tiles, etc.

Original languageEnglish
Pages (from-to)2367-2372
Number of pages6
JournalJournal of the European Ceramic Society
Issue number8
Publication statusPublished - Jul 2004
Externally publishedYes


  • Glass-ceramics
  • Kaolin clay waste
  • Mechanical properties
  • Silica sand waste
  • Waste materials

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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