First grind and second bake. The largest advantage of this technique, compared with that of “first bake and second grind”, is energy consumption reduction. Large plaster stone shall be ground into powders with diameter less than 0.2mm, which increases the specific surface when calcining, enlarges the contact area with heat medium, improves calcination heat exchange efficiency and lowers energy consumption greatly. This equipment has small bulk, large production capacity, and simple structure and is hard to destroy.
　　Analysis on technique features:

I. Concept of technique
　　 Crusher grinds large gypsum into small granules less than 25mm. After storage and measurement with weigh belt, transfer them into Raymond mill for milling. Transfer qualified calcined gypsum powder to clinker bin for storage or to board-manufacturing workshop for usage.

II. Technique’s advantages:

１．Features of first grind and second bake:
    Compared with that of first grind 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 0.2mm, which increases the specific surface when calcining, enlarges contact area with heat medium, improves calcining heat exchange efficiency and lowers energy consumption greatly; the disadvantages are three powder pollution positions in technical process, which shall be solved with dust-removing equipment.
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