Gypsum deposits are industrially divided into four categories:
1) Layered gypsum and anhydrite deposits
2) Fibrous gypsum deposits
3) Fibrous gypsum, layered gypsum and anhydrite deposits
4) Giant - pegmatite paste deposit in loose bed
Gypsum is mostly used for cement retarder in our country, accounting for about 90% of the total utilization of gypsum, and in other aspects such as gypsum walling materials,
Cementitious materials, agriculture (for soil amendment and fertilizer), chemical industry, light industry, food, arts and crafts, culture and education, medicine, etc
Volume only accounts for about 8%.
1 Application of gypsum in cement production
Cement is produced by adding an appropriate amount of gypsum to the clinker and grinding it to a certain fineness. Gypsum is added mainly for control purposes
The hydration of C3A in clinker regulates the setting time of cement. Adding a certain amount of gypsum in cement production can not only play a role in cement
Slow coagulation, but also can improve the strength of cement. Our country is the biggest producer of cement in the world, in the future a very long time
The cement industry is still the biggest consumer of gypsum enterprises.
2 Application of gypsum in the construction industry
2.1 Lightweight gypsum blocks
Gypsum blocks are made of building gypsum (β-hemihydrous gypsum) or anhydrous anhydrous anhydrous gypsum as the main raw material, according to different models and types
Seek, adding appropriate amount of cement, perlite, fiber, slag, fly ash, inorganic and organic reinforcing agent, waterproof agent and other auxiliary raw materials, b
Casting or pressing molding, natural drying and other processes made of light partition block material. Lightweight gypsum blocks are promising
New building materials, compared with traditional building materials, have low energy consumption, low pollution, light weight, fire prevention, heat insulation, sound insulation,
Small shrinkage rate, nail, saw, bond and other outstanding advantages, is the ideal material to replace red brick, has a broad development prospect in
Abroad, especially in Europe and Australia, the construction industry has become a substitute for traditional materials. Many large engineering projects are designated
This new type of lightweight block is used. At present there are about ten small-scale semi-mechanized production lines in our country, the annual output is only 300 thousand tons.
Production and application are still in the initial stage
2.2 Gypsum board
Gypsum board is the most widely used and the most productive gypsum product among all gypsum building materials. Compared with traditional building materials, gypsum board
There are many advantages. Gypsum board can be divided into the following varieties according to the use of raw materials and specific uses and functions:
(1) Gypsum based plant fiberboard. Gypsum based plant fiberboard is gypsum as the matrix, plant fiber as the reinforcing material, adding must
Auxiliary raw materials, a kind of light building material with excellent performance made by cold pressing, which is mainly used in building partition wall and interior decoration.
Compared with traditional solid clay brick, it has obvious advantages: light weight; Save energy consumption; Increase the use area; Convenient for construction and
Flexible use; The decoration is novel and beautiful; No pollution; Good insulation, sound insulation and adjustable indoor humidity. Gypsum based plant
Fiberboard has a very broad market prospect both at home and abroad.
