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Why do the roaster require less excess air?

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+1 vote
in Fluidization Engineering by (102k points)
Why do the roaster require less excess air?

(a) For better roasting of sulphur ores

(b) To maintain required temperature

(c) To give off gas

(d) All of the mentioned

The question was posed to me in an internship interview.

Asked question is from Roasting of Sulphide Ores in chapter Industrial Applications of Fluidized Beds of Fluidization Engineering

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Correct answer is (c) To give off gas

To elaborate: To give off gas with higher concentration of sulphur dioxide concentration.

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