Studies on the formation of black particles in rice husk silica ash

The formation of black (carbon fixed) particles in rice husk silica ash has been studied in detail. The formation of black particles in the silica obtained by calcination of raw untreated rice husks, is higher than that in acid treated rice husks. The tendency to form black particles increases with...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2001, Vol.21 (1), p.99-104
Main Authors: Krishnarao, R.V., Subrahmanyam, J., Jagadish Kumar, T.
Format: Article
Language:English
Subjects:
Carbon particulate
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
New materials: theory, design, and fabrication
Other materials
Physics
Rice husks
SiO 2
Specific materials
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Summary:The formation of black (carbon fixed) particles in rice husk silica ash has been studied in detail. The formation of black particles in the silica obtained by calcination of raw untreated rice husks, is higher than that in acid treated rice husks. The tendency to form black particles increases with increase in the heating rate and the temperature of calcination of the untreated rice husks. Potassium has been shown to cause the formation of black particles in rice husk silica. By treating with 3.0 N HCl acid the formation of black particles can be avoided. There is no effect of heating rate on the formation of black particles in silica from acid treated rice husks. Treatment with HCl acid was found to decrease the oxidation (burning) of carbon at lower temperature (400°C ).
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(00)00170-9