Product Name : MINERAL GYPSUM (CaSO4.2H2O)
Mineralogy of Gypsum: Mineral gypsum is the most common of the naturally occurring sulphate minerals. It is a dehydrate calcium sulphate (CaSO4.2H2O) with a composition of 70% calcium sulphate and 21% water. Anhydrite (CaSo4) is also a naturally occurring sulphate mineral with no water of crystallization. Pure gypsum contains CaO 32.6%,So3 46.5%, and H2O 20.9%. Mineral gypsum and anhydrite are frequently found in close association and it is seldom that a natural calcium sulphate deposit will consist exclusively of one mineral or the other. These are common evaporate minerals. Gypsum tends to be of greater economic importance because of its chemical properties.
APPLICATION OF GYPSUM
- As a source of Sulphur:-
Sulphur absorption by the crops from the soil/per ton of grain production per hectare:-
Cereal 3-4 Kg
Pulses 8 Kg
Oilseeds 12 kg
- Natural gypsum contains 13% – 18% Sulphur. This is used as a source of Sulphur to the soil.
- Use of mineral gypsum in Punjab, Haryana and Rajasthan substantially increased the yield of Oil Seeds and pulses and also improved yield of potato & Sugarcane.
- Reclamation of Sodic land:-
Gypsum neutralizes alkaline soils and improves the soil permeability.
Gypsum provides Sulphur and Calcium to give catalytic support for maximum fertilizer utilization.
Mineral gypsum powder is used effectively for reclaiming alkaline soils.
- Use of Gypsum in Cement:-
4% to 6% of Gypsum by weight in crushed condition is utilized in Portland cement manufacture after mixing with clinker.
Gypsum acts as a retarder and controls the setting time of cement.
- Use of Gypsum in Plaster of Paris:-
Gypsum at 150oC converts into hemi hydrate form which is known as Plaster of Paris. This is used in construction industry for making wall boards, decorative roofing etc.