Currently, the world is very rich in gypsum reserves reach to 150 million tons, the annual extraction of 1.30 million tons. China is a long history country rich in gypsum deposits, ink ore reserves accounted for 75% of the world's total reserves, which crystalline gypsum reserves 52.8 million tons, aphanitic gypsum reserves of 23.71 million tons, abundant gypsum reserves resources accumulated a solid foundation for the development and application of gypsum,
gypsum has also been widely expanded in the field of pharmacy applications.
Excellent characteristics of gypsum, making it widely used in the metallurgical, chemical, petrochemical, high-energy physics, aerospace, electronics and other industries. Gypsum can be used as refractory materials, such as refractory bricks, crucibles, continuous casting powder, mold core and high-temperature materials; Mixture which mixed with other impurities can be used for steelmaking; Can be used as an electrode, brushes, carbon rod, carbon tube in electrical industry;
1. superior high temperature resistance: melting point of gypsum is 3850 ± 50 ℃, boiling point is 4250 ℃. Weight loss is very small; the thermal expansion coefficient is small as well even after burning by ultra-high temperature electric arc. Gypsum strength strengthen with the increases of temperature, the gypsum strength doubled at 2000 ℃.
2, gypsum products own good thermal conductivity and thermal shock resistance. Gypsum can withstand the dramatic changes in temperature without damage at room temperature. Little change in the volume of gypsum will occur but without crack when the temperature jump.