Natural dihydrate gypsum (CaSO4·2H2O) is also called raw gypsum. After calcination and grinding, β-type hemihydrate gypsum (CaSO4·1/2H2O) can be obtained, that is, building gypsum, also known as plaster of paris and plaster. If the calcination temperature is 190 °C, model gypsum can be obtained, and its fineness and whiteness are higher than those of building gypsum. If the raw gypsum is calcined at 400-500 °C or higher than 800 °C, the floor gypsum is obtained. Its coagulation and hardening are slow, but the strength, wear resistance and water resistance after hardening are better than ordinary building gypsum. Usually white, colorless, colorless transparent crystals called gypsum, sometimes gray, light yellow, light brown and other colors due to impurities.
Gypsum processing and production process
At present, our company can design and produce dozens of specifications of production lines, and can tailor production lines with different production processes according to the different needs of users.
1.The gypsum powder production line adopts domestic mature and advanced process equipment, such as vertical mill, boiling furnaces, etc.
2.The crusher crushes the large-sized gypsum ore into small particles less than 30mm, and transports it to the mill for grinding;
3.The powder concentrator sends the gypsum raw powder that reaches the required fineness of the product after grinding into the boiling furnace for calcination, and the rest is returned to the mill for re-grinding until it is qualified. Boiling furnace is widely used in gypsum calcining equipment in my country. The equipment is simple in structure and easy to operate.
4.The calcined qualified gypsum powder is sent to the clinker silo for storage or sent to the product workshop for use.
Gypsum Grinding Mill
The gypsum powder production line designed by our company adopts domestic mature and advanced process equipment, such as European version trapezoidal mill. The European version trapezoidal mill is the most widely used equipment in my country in the calcination of building gypsum. Simple structure, small size, large production capacity The equipment is compact in structure, not easy to be damaged, small in floor space, low in consumption and convenient in operation.
Investment prospects
The new building materials have excellent characteristics such as light weight, high strength, heat preservation, energy saving, soil saving and decoration. The use of new building materials not only greatly improves the function of the house, but also makes the interior and exterior of the building more modern and meets people’s aesthetic requirements. The properties and functions of new building materials are different, and the raw materials and process methods for producing new building materials are also different. Some new building materials can significantly reduce the weight of buildings, create conditions for the promotion of light building structures, and greatly speed up the construction of houses. Some varieties focus on design and color, such as decoration materials; some varieties focus on functions, such as thermal insulation materials; some are derived from multiple varieties through deep processing, such as new building boards. Take new building boards as an example. At present, there are dozens of varieties of new building boards. Among them, gypsum board, glass fiber reinforced cement (GRC) board and non-asbestos calcium silicate board are three new building boards with very large production volume and common application in China. These three kinds of plates not only use different raw materials, but also have different production processes, and their performance and functions are also different. The raw materials they use are all non-metallic materials and are easy to obtain. They are used as the original plates, and then equipped with functional materials such as anti-seepage, heat preservation, fire prevention, etc., and composite technology can be used to produce a new type of wall with light weight and superior performance. Material.
The main purpose of gypsum
Gypsum belongs to the monoclinic crystal system with a high degree of cleavage and is easy to crack into thin slices. Hemihydrate gypsum can be obtained by heating gypsum to 100-200°C and losing part of crystal water. α-type hemihydrate gypsum crystals are good and firm; β-type hemihydrate gypsum is a flaky and cracked crystal, the crystal is very fine, and the specific surface area is much larger than that of α-type hemihydrate gypsum. When producing gypsum products, α-type hemihydrate gypsum requires less water than β-type gypsum, and the products have higher density and strength. Usually, α-type hemihydrate gypsum, also known as high-strength gypsum, is made by steaming in a saturated steam medium with an autoclave; plaster. The slurry of hemihydrate gypsum mixed with water re-forms dihydrate gypsum, which rapidly solidifies and hardens during drying to gain strength, but softens when exposed to water. Gypsum is the main raw material for the production of gypsum cementitious materials and gypsum building products, as well as a retarder for Portland cement. After the gypsum is calcined at 600~800°C, a small amount of lime and other catalysts are added to grind it together to obtain anhydrite cement (also known as King’s cement). . The products made with these two kinds of gypsum have higher strength than building gypsum products, and the anhydrite binder has better heat insulation, and the high-temperature calcined gypsum has better wear resistance and water resistance.
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