Discussion
A destoner is a specific gravity separator arranged to remove
Answer: D
Correct answer: Stones and dense foreign matter
A destoner is a specific gravity separator arranged to lift the grain and leave the heavy fraction behind. Air is blown up through a perforated oscillating deck, fluidising the bed so the lighter grain floats and the denser stones, mud balls and metal fragments settle to the deck surface and are walked uphill to a separate outlet.
The separation is essential before milling: a stone entering a huller or a roller mill damages the machine and can strike sparks in a dust-laden atmosphere.
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