Gypsumis common name for a mineral compound called calcium sulp. dihydroxide, or sulphate of lime. It is generally found underground near limestone or other minerals formed by evaporation. One of the most common forms of raw gypsum is a pure white crystal called alabaster.
Gypsum ore, from quarries and underground mines, is crushed and stockpiled near a plant. As needed, the stockpiled ore is further crushed and screened to about 50 millimeters (2 inches) in diameter. If the moisture content of the mined ore is greater than about 0.5 weight percent, the ore must be dried in a rotary dryer or a heated roller mill. Ore dried in a rotary dryer is conveyed to a roller mill, where it is ground to the extent that 90 percent of it is less 149 micrometers (µm) (100 mesh). The ground gypsum exits the mill in a gas stream and is collected in a product cyclone.
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