Uses of Gypsum
Gypsum wallboard (drywall or plaster board) , is a building panel consisting mainly of a on combustible gypsum core material sandwiched between two durable paper faces.
Natural gypsum is mined, crushed, dried and ground. Then it is calcined eliminating most of its water content as steam.
This calcined gypsum, commonly called Plaster of Paris, is then mixed with other ingredients, formed into sheets which are covered with recycled paper face front and back.
The gypsum core will not support combustion or transmit temperatures greatly in excess of 212°F (100°C) until completely calcined, a slow and long process. Expansion and contraction under normal atmospheric changes is negligible.
Gypsum, a soft mineral (hydrated calcium sulfate) is used by cement manufacturers to retard and regulate the set of Portland cement. Gypsum rock not only enhances the strength of cement but also reduces shrinkage of cured cement.
Soil conditioner / fertilizer
Gypsum is also used as an economical soil conditioner and fertilizer in some crops.
Over time, drainage and excessive farming deplete the fields of vital elements like calcium, carbon, hydrogen, iron, magnesium, nitrogen, oxygen, phosphorus, potassium and sulfur.