Microporous glass ceramics from combination of silicate, borate and phosphate wastes

Cicek B., Esposito L., Tucci A., Bernardo E., Boccaccini A. R., Bingham P. A.

ADVANCES IN APPLIED CERAMICS, vol.111, no.7, pp.415-421, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 111 Issue: 7
  • Publication Date: 2012
  • Doi Number: 10.1179/1743676112y.0000000018
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.415-421
  • Keywords: Glass ceramic, Boron, Meat bone and meal ash, Waste recycling, BORON, ASH, MICROSTRUCTURE, FOAMS
  • Yıldız Technical University Affiliated: No


Borate mineral wastes and phosphate ash resulting from the incineration of meat and bone meal represent two particularly abundant inorganic wastes. This paper is dedicated to the combination of such wastes, together with kaolin clay, focused on the development of highly porous ceramic bodies. Borate waste has a multiple effect, providing liquid phase at the sintering temperature (1050 degrees C), gas release (from the decomposition of its calcite fraction) and a CaO source, which reacts with residues from clay and promotes the formation of anorthite crystals as a newly formed phase. Control of the heating rate, i.e. adoption of fast heating (20 degrees C min 21) and, above all, introduction of recycled soda-lime-silica glass as secondary additive, allowed obtaining lightweight microporous bodies (density below 0.45 g cm(-3)) with uniform pore structure that could be useful for thermal and acoustic insulations.