Discussion
Consider the following statements about rice husk:
1. It contains fifteen to twenty per cent silica.
2. Its ash is pozzolanic if the husk is burnt below about 700 degrees.
3. It is a valuable protein source in animal feed.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statement 1 is correct: rice husk is 15 to 20 per cent silica, far more than any other common residue. Statement 2 is correct: the ash is pozzolanic provided the husk is burnt below about 700 degrees, so the silica stays amorphous.
Statement 3 is false. Husk is almost entirely indigestible and contains very little protein; the silica that makes it valuable to the cement industry is exactly what makes it useless and abrasive as a feed.
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