Abstract
The physical transformation of powdered kaolinite associated with rapid dehydroxylation during flash calcination has been followed using pycnometry, thermogravimetry, electron microscopy, X-ray powder diffraction and infrared spectroscopy. 116 partially dehydroxylated kinetically-frozen calcines were produced in a laboratory flash calciner covering the following ranges of process variables: calciner temperature 700–1000 °C, rate of heating to calciner temperature 4700–15000 Ks−1, residence time at the calciner temperature 0.1–1.5 s, He or N2 calciner atmosphere. From the analyses of these calcines a picture of the changes in physical characteristics caused by flash heating of kaolinite has emerged and is described.
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