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Phase reactions in the brick firing process of V-doped clay

Fachbereich Geowissenschaften der Universität, Klagenfurter Straße, D-28359 Bremen, Germany

^* e-mail: rfischer{at}min-uni-bremen.de

The phase reactions of V-doped clays in brick burning processes are studied to evaluate the utilization of V-containing wastes in brickworks. V₂O₅ was admixed to clay and annealed at temperatures between 200 and 1000 °C. The formation of mullite, cristobalite, and a pseudobrookite compound is observed between 700 and 800 °C. These phases do not occur in pure clay annealed in the corresponding temperature range. The samples were investigated with X-ray powder diffraction methods, quantitative analyses were performed with the Rietveld method and chemical analyses with X-ray fluorescence spectroscopy. Analytical Transmission Electron Microscopy showed incorporation of vanadium and iron in mullite.

Key-words: brick burning, heavy metal contaminated waste, vanadium, cristobalite, mullite, X-ray powder diffraction (XRD), Rietveld analysis, Analytical Transmission Electron Microscopy (ATEM).