Physico-Chemical Features of the Synthesis of Mullite in Mixtures of Quartz-Pyrophyllite Rock with a Fluoride-Forming Component

Physico-Chemical Features of the Synthesis of Mullite in Mixtures of Quartz-Pyrophyllite Rock... It is established that the use of an ammonium fluoride treatment on quartz-pyrophyllite rock (45% pyrophyllite and 53% quartz) at 650°C changes the traditional mechanism by which mullite is synthesized; it is formed not from metapyrophyllite but from fluoridated pyrophyllite, with the formation of aluminum trifluoride and topaz being intermediate stages of the synthesis process. The optimum ratio of quartzpyrophyllite rock to ammonium hydrodifluoride is 1:1.6, which at 1300°C increases the yield of acicular mullite (with particles 20 – 30 μm long and 3 – 5 μm in cross section) from 12 to 68 wt.%. The content of residual quartz in the mullite is no greater than 15 – 18 wt.%. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

Physico-Chemical Features of the Synthesis of Mullite in Mixtures of Quartz-Pyrophyllite Rock with a Fluoride-Forming Component

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Publisher
Springer US
Copyright
Copyright © 2014 by Springer Science+Business Media New York
Subject
Material Science; Characterization and Evaluation of Materials; Materials Science, general; Ceramics, Glass, Composites, Natural Methods
ISSN
1083-4877
eISSN
1573-9139
D.O.I.
10.1007/s11148-014-9675-2
Publisher site
See Article on Publisher Site

Abstract

It is established that the use of an ammonium fluoride treatment on quartz-pyrophyllite rock (45% pyrophyllite and 53% quartz) at 650°C changes the traditional mechanism by which mullite is synthesized; it is formed not from metapyrophyllite but from fluoridated pyrophyllite, with the formation of aluminum trifluoride and topaz being intermediate stages of the synthesis process. The optimum ratio of quartzpyrophyllite rock to ammonium hydrodifluoride is 1:1.6, which at 1300°C increases the yield of acicular mullite (with particles 20 – 30 μm long and 3 – 5 μm in cross section) from 12 to 68 wt.%. The content of residual quartz in the mullite is no greater than 15 – 18 wt.%.

Journal

Refractories and Industrial CeramicsSpringer Journals

Published: Aug 12, 2014

References

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