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how gypsum rock to be crushed

Sep 22 2011 Calcining and Second Grind Raw gypsum rock is crushed before it arrives at the wallboard plant Once there it is heated to 350 F in a process called calcining which removes 75 percent of the molecularly bonded water With this water removed a second grind of the gypsum which occurs during or after calcining results in a superfine powder

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