Abstract
Granulated raw materials with a particle size of 20-80 μm were prepared from a slurry of Na2CO3, CaCO3, and SiO 2 (quartz) by the spray-dry method, and injected with carrier gas into a radio-frequency induction thermal plasma. Spherical particles 5-60 μm in size were obtained and analyzed. Thermo-gravimetric analysis and X-ray diffraction analysis showed that during the short flight of the order of milliseconds, all carbonates were decomposed and >95% quartz was reacted into a noncrystalline state. Glass transition was clearly observed by differential thermal analysis. Increase of the carrier gas from 3 to 6 L/min led to a decrease in the volatilization ratio of Na2O from 46% to 18% with a slight decrease of the reaction ratio of quartz in trade balance. Electron probe microanalysis showed that the volatilization could be attributed to an excess heating of small particles <30 μm, and suppression by the increase of carrier gas.
Original language | English |
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Pages (from-to) | 3908-3914 |
Number of pages | 7 |
Journal | Journal of the American Ceramic Society |
Volume | 91 |
Issue number | 12 |
DOIs | |
Publication status | Published - Dec 2008 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry