Amazon.com: Private Lessons (25th Anniversary Edition): Sylvia Kristel, Howard Hesseman, Eric Brown, Meridith Baer, Pamela Jean Bryant, Peter Elbling, Patrick Piccininni, Ed Begley Jr., Ron Foster,
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The raw material is loaded into the mill through the feeding device, and hot air enters the mill through the air inlet pipe. As the mill cylinder rotates, the coal and hot air exchange heat in the mill.