Utilization of coal fly ash in the glass-ceramic production

J Hazard Mater. 2007 Oct 22;149(2):523-6. doi: 10.1016/j.jhazmat.2007.07.044. Epub 2007 Jul 21.

Abstract

Manufacturing the glass-ceramic has been proposed as a useful choice to recycle coal fly ash from power plants. In this work, a glass-ceramic of SiO2-Al2O3-Fe2O3-CaO family was synthesized by mixing 90 wt% of coal fly ash, from a power plant in west of China, with Na2O, and then melted at 1350 degrees C. The ceramization of the obtained glass was carried out at 770 degrees C for 2h. Esseneite and nepheline were found present as major crystal phases. The produced glass-ceramic exhibited good chemical durability as well as good mechanical properties. The toxicity characteristic leaching procedure (TCLP) method found that the glass-ceramic was non-hazardous.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbon / chemistry*
  • Ceramics / chemistry*
  • Coal Ash
  • Glass / chemistry*
  • Metals, Heavy / chemistry
  • Microscopy, Electron, Scanning
  • Oxides / chemistry
  • Particulate Matter / chemistry*
  • X-Ray Diffraction

Substances

  • Coal Ash
  • Metals, Heavy
  • Oxides
  • Particulate Matter
  • Carbon