Alabaster, fine-grained massive gypsum. Used for sculptures, carvings and other decorations for centuries. It is generally snow white, translucent, and can be artificially dyed; it can become opaque by heat treatment, and its appearance is similar to marble. Italy's Florence, Livorno, Milan and Berlin are important centers of the alabaster trade.

Uses of plaster:

The white alabaster in alabaster has white color, low hardness, and whiteness of about 96. It is suitable for food additives or whitening.
Translucent alabaster has a relatively high hardness. The whiteness is around 90, suitable for making mould plaster powder. Used to make ceramic molds, industrial molds, etc.
Alabaster with a greener color has high hardness and a whiteness of about 85 or lower. It can be made into gypsum powder, medium and high-grade gypsum board, or cement.
Gypsum can be used as a raw material, mineralizer, retarder, and arousal in cement plants. Among them, the SO2 component is used to balance the ratio of sulfur to alkali in the clinker roasting, and to improve the service life of roasting operators and refractory materials.

The role of gypsum:

1. As raw materials, gypsum slag cement, gypsum bauxite expansive cement, etc.;
2. As a mineralizer, reduce the roasting temperature and save coal;
3. As a cement set-adjusting agent, it has a retarding effect, so that the cement setting time meets the national standard;
 4. As an arousing agent, it can arouse the activity of industrial waste residues such as fly ash and slag and improve the strength of fly ash cement and slag cement;
5. Gypsum can improve cement properties, such as strength, expansion and corrosion resistance;
6. Adjust the sulfur alkalization in the clinker to reduce the possibility of skinning and blockage and improve the compatibility with concrete.

Most of the commonly used gypsum in the industry is plaster of paris. Gypsum mills are used to process plaster of paris. So what is the process of making gypsum powder?
plaster of paris
Plaster of paris

What is the process of making gypsum powder?

The production process of gypsum can be summarized as the three major processes of gypsum stone crushing, calcination and grinding.
gypsum powder processing plant
Gypsum powder processing plant

First, the gypsum stone ore is crushed to about 30 mm using a jaw crusher and an impact crusher, and then transported to the grinding mill for fine grinding. The gypsum powder with the required fineness of the product after grinding is sent to the rotary kiln for calcination by the powder concentrator. If the gypsum powder does not meet the requirements, it will be returned to the mill for fine grinding to meet the product size and then calcination.
In order to stabilize the production and calcination of construction gypsum, gypsum stones of different grades are pre-homogenized in a homogenization field. Then the raw gypsum is evenly fed into the jaw crusher through the feeder, and crushed into a particle size of 10-25mm, and then finely crushed by the impact crusher. There are bucket elevators, silos, and feeders into the rotary kiln for dehydration. Grind.
The quality of the building gypsum powder processed by the production line of beneficiation, crushing, grinding and calcination is good. Due to the low temperature heat source, the gypsum is not easy to overfire. As long as the discharge temperature is controlled properly, the finished product does not contain dihydrate gypsum, and anhydrous gypsum is only Within 5%, the rest are hemihydrate gypsum. This kind of composition is ideal, and the physical properties are also very stable. It has been successfully put into production in the construction industry such as the production of gypsum board in major regions.
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