Properties of glass-ceramics prepared from Kira (waste by-products of silica sand and kaolin clay refining) and various additives

K. Okada, T. Toya, Y. Kameshima, A. Nakajima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Five different glass-ceramics were prepared from Kira (waste by-products from processing of silica sand and kaolin clay) with various additives. Mixtures of Kira with CaCO3 (mass ratio 62.7/37.3, designated sample CC), dolomite (mass ratio 65/35, CM1) and mass ratio 75/25 (CM2), and paper sludge ash waste (mass ratio 55/45, PS) were melted at 1350-1400°C, quenched in water and ground to <48 mesh. Glass-ceramic samples were prepared by re-firing these powders at 950-1100°C. The main crystalline phases formed were wollastonite in CC, diopside (in CM1), anorthite (in CM2), quartz solid solution (in PS fired at 1000°C, designated PS1) and cristobalite (in PS fired at 1100°C, designated PS2). All these glass-ceramics showed a smooth-textured shiny white appearance and had very good mechanical properties; their four point bending strengths ranged from 63 to 130 MPa and Vickers microhardness values ranged from 6.0 to 7.6 GPa. Their thermal expansion coefficients ranged from 4.7×10-6 to 8.1×10-6 /°C and their chemical durabilities towards acid (1 mass% H 2SO4 at 90°C) were in the range 3.6×10 -9 to 93×10-9 g/(cm2s). Their resistance to alkali (1 mass% NaOH at 90°C) ranged from 8.2×10-9 to 27×10-9 g/(cm2s). The chemical durability of these glass-ceramics is better than that in commercial glass-ceramics used as building materials. Kira waste is therefore a promising candidate raw material for glass-ceramic building materials, ceramic tiles, etc.

Original languageEnglish
Title of host publicationWaste Management in Japan
EditorsH. Itoh
Pages11-19
Number of pages9
Publication statusPublished - Dec 1 2004
Externally publishedYes
EventSecond International Conference on Waste Management and the Environment - Rhodes, Greece
Duration: Sep 29 2004Oct 1 2004

Publication series

NameWaste Management in Japan

Other

OtherSecond International Conference on Waste Management and the Environment
CountryGreece
CityRhodes
Period9/29/0410/1/04

Keywords

  • Chemical durability
  • Glass-ceramics
  • Kaolin clay waste
  • Mechanical properties
  • Silica sand waste
  • Thermal expansions

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Okada, K., Toya, T., Kameshima, Y., & Nakajima, A. (2004). Properties of glass-ceramics prepared from Kira (waste by-products of silica sand and kaolin clay refining) and various additives. In H. Itoh (Ed.), Waste Management in Japan (pp. 11-19). (Waste Management in Japan).