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

被引：225
|
作者：
Krishnarao, RV [1 ]
Subrahmanyam, J [1 ]
Kumar, TJ [1 ]
机构：
[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2001年 / 21卷 / 01期
关键词：
carbon particulate; rice husks; SiO2;
D O I：
10.1016/S0955-2219(00)00170-9
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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 degreesC). (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：99 / 104
页数：6
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