Discussion
Moisture in the raw materials matters chiefly because it
Answer: B
Correct answer: must be evaporated, which consumes fuel and kiln capacity
Every kilogram of water in the feed must be boiled off before anything else can happen, at about 2.3 megajoules per kilogram, and the vapour then occupies gas handling capacity. In a dry process plant that heat comes from the kiln exhaust, so wet raw materials reduce the throughput as well as raising the fuel per tonne - which is why moisture is monitored and stockpiles are often covered.
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