Gypsum Manufacturing Equipment
In some gypsum processing plants, drying, grinding, and calcining are performed in heated impact mills. In these mills hot gas contacts gypsum as it is ground. The gas dries and calcines the ore and then conveys the stucco to a product cyclone for collection. The use of heated impact mills eliminates the need for rotary dryers, calciners, and roller mills. Gypsum and stucco are usually transferred from one process to another by means of screw conveyors or bucket elevators.
Gypsum Processing Plant
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 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 100 mesh. The ground gypsum exits the mill in a gas stream and is collected in a product cyclone.
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Gypsum Application in Ammonium Sulfate Production
Gypsum is chiefly utilized in the manufacture of ammonium sulphate fertilizer, plaster of Paris, distemper and cement. A considerable quantity of gypsum is used as manure. It is a good soil conditioner and gives growth of peas, beans and alfalfa. Gypsum and anhydrite can be a good source of sulphur.
Anhydrite has been utilized in the UK and West Germany for the extraction of sulphur. The use of gypsum for the manufacture of gypsum-stucco for making tiles, roof planks and board products is fast increasing in USA. Stucco is the industrial name for the product obtained from the calcination of gypsum to hemihydrate stage.