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Q: Under properly controlled combustion and temperature, what is the percentage of silica content that can be obtained from rice husk ash?
  • A. 57% – 60%
  • B. 85% – 95%
  • C. 40% – 50%
  • D. 60% – 70%
Correct Answer: Option B - Rice husk ash–Rice husk ash is produced by burning rice husks that contain a large proportion of silica approx 85-95%. • Rice husk ash must be burnt at between 550ºC and 800ºC to achieve that state. • Burning at too high a temperature gives a crystalline silica that is not reactive and a health risk.
B. Rice husk ash–Rice husk ash is produced by burning rice husks that contain a large proportion of silica approx 85-95%. • Rice husk ash must be burnt at between 550ºC and 800ºC to achieve that state. • Burning at too high a temperature gives a crystalline silica that is not reactive and a health risk.

Explanations:

Rice husk ash–Rice husk ash is produced by burning rice husks that contain a large proportion of silica approx 85-95%. • Rice husk ash must be burnt at between 550ºC and 800ºC to achieve that state. • Burning at too high a temperature gives a crystalline silica that is not reactive and a health risk.