Gypsum 2019-11-07 10:59:56

Gypsum

Natural dihydrate gypsum (CaSO4·2H2O) is also called raw gypsum. After calcination and grinding, β-type hemihydrate gypsum (CaSO4·1/2H2O), that is, building gypsum, also known as plaster and plaster. If the calcination temperature is 190 °C, the model gypsum can be obtained, and its fineness and whiteness are higher than that of the building gypsum. If the gypsum is calcined at 400-500 °C or higher, the floor gypsum will be solidified and hardened, but the strength, wear resistance and water resistance after hardening are better than ordinary building gypsum. Usually white, colorless, colorless transparent crystal called transparent gypsum, sometimes due to impurities such as gray, light yellow, light brown and other colors.

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Ore name: Gypsum

Hardness: 2

Chemical formula: CaSO4·2H2O

Mineral density: 2.31~2.33

Crystal habit: plate, fibrous, massive or fine

Application: construction, medical, etc.

Gypsum processing production process

Forefront stage

At present, our company can design and produce dozens of specifications of production lines, and can customize the production lines of different production processes according to different needs of users.

second stage

The gypsum powder production line adopts domestic mature and advanced process equipment, such as vertical mill and boiling furnace.

The crusher breaks the large-sized gypsum ore into small pieces of less than 30mm and transports it to the mill for grinding;

The third stage

The powder sorting machine feeds the gypsum raw powder which has reached 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. The boiling furnace is a widely used equipment in the construction of gypsum calcining equipment in China. The equipment has simple structure and convenient operation.

Fourth stage

The qualified gypsum powder after calcination is sent to the clinker silo for storage or sent to the product workshop for use.

Required equipment

The gypsum powder production line designed by our company adopts domestic mature and advanced process equipment, such as the European version of T-shaped grinding. The European version of the T-shaped grinding is a widely used equipment in the construction of gypsum calcining equipment in China. Simple structure, small size, large production capacity The equipment is compact, not easy to damage, small footprint, low loss and easy to operate.

Main use of gypsum

Gypsum is a monoclinic system with high degree of cleavage and easy to split into thin slices. The gypsum is heated by heating the gypsum to 100 to 200 ° C and losing part of the crystal water to obtain hemihydrate gypsum. The α-type hemihydrate gypsum crystallizes well and is solid; the β-type hemihydrate gypsum is a plate-like and cracked crystal with fine crystals and a much larger specific surface area than α-type hemihydrate gypsum. When producing gypsum products, α-type hemihydrate gypsum requires less water than β-type, and the product has higher density and strength. Usually, it is made by steaming autoclave in saturated steam medium, which is α-type hemihydrate gypsum, also called high-strength gypsum. It is made of β-type hemihydrate gypsum by using a wok or rotary kiln open device. plaster. The slurry of semi-hydrated gypsum and water is re-formed into dihydrate gypsum, which is rapidly solidified during the drying process to obtain strength, but softens when exposed to water. Gypsum is the main raw material for the production of gypsum cementitious materials and gypsum construction products, and also 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 together to obtain an anhydrite cement (also known as Jin's cement); after calcination at 900-1000 ° C and grinding, high-temperature calcined gypsum can be obtained. . The products made of these two kinds of gypsum have higher strength than the construction gypsum products, and the anhydrite cement has better heat insulation, and the high temperature calcined gypsum has better wear resistance and water resistance.

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