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84-
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compared with that of first grint and second bake,the largest advantage of this technique is great energy consumption reduction. the reason lies in ,great plaster stones are ground into powders with diameter less than 0.2 mm,which increases the specific surface when calcining,enlarges contact area with heat medium ,improves calcining heat exchange effciency and lowers energy consumption greatly, the disadvantages are three powder pollution position in technical process, which shall be solved with dustremoving equipment.
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