Top 7 Application And Uses Of Gypsum

2022-07-08

Summary:Gypsum is a versatile industrial and building material, It can also be used to many other fields.

Gypsum natural dihydrate gypsum (CaSO4•2H2O), also known as raw gypsum, after calcination, fine grinding can obtain β type hemihydrous gypsum (CaSO4•1/2H2O), that is, construction gypsum, also known as slagd gypsum, plaster. If calcined at a temperature of 190 °C, a model plaster is obtained, and its fineness and whiteness are higher than that of construction plaster. If the raw gypsum is calcined at 400-500 °C or higher than 800 °C, the floor plaster is obtained, which condenses and hardens more slowly, but the strength, wear resistance and water resistance after hardening are better than that of ordinary construction gypsum. Gypsum is a versatile industrial and building material. It can be used for cement retardant, gypsum building products, model making, medical food additives, sulfuric acid production, paper filler, paint filler, etc.

Material Properties

Gypsum belongs to the monoclinic crystal system, the degree of cleavage is very high, and it is easy to crack into flakes. The gypsum is heated to 100 ~ 200 ° C, and part of the crystalline water is lost, and the semi-water gypsum can be obtained. It is a gas-hard cementitious material with two forms, α and β, both diamond-shaped crystals, but with different physical properties. α type hemihydrous gypsum crystallizes well and is solid; β-type hemihydrous gypsum is a flaky and cracked crystal with a fine crystal and a much larger specific surface area than α-type hemihydrous gypsum.

When producing gypsum products, α type semihydral gypsum requires less water than β type, and the product has a higher degree of compactness and strength. Usually distilled in a saturated vapor medium by an autoclave is α type hemihydrous gypsum, also known as high-strength gypsum; Calcined from a wok or rotary kiln open device, a β-type semi-aqueous plaster, i.e. construction plaster. The industrial by-product chemical gypsum has the same properties as natural gypsum and does not require excessive processing. The slurry mixed with water re-forms the gypsum dihydrate, which quickly condenses and hardens during the drying process to gain 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 is also a retardant for Portland cement. After calcining the gypsum at 600~800 °C, a small amount of lime and other catalysts are added to grind together to obtain an ante gypsum cementitious material (also known as Gold's cementitious material); Calcined and finely ground at 900~ 1000 °C, high temperature calcined gypsum can be obtained. The products made of these two kinds of gypsum are stronger than those of building gypsum products, and the anteline cement has better heat insulation, and the high-temperature calcined gypsum has better wear resistance and water resistance.

Top 7 Application And Uses Of Gypsum

Natural gypsum applications are divided into general applications and their deep processing applications. The general applications of natural gypsum mainly include: construction, art, ceramics, food additives, pharmaceuticals, and medical gypsum boards. 

1. Building Materials

The largest user of gypsum in the building materials industry is the building materials industry, which is used to produce various gypsum building material products as raw materials for cement and cementing materials. Such as the production of gypsum partition board, load-bearing interior wall board, exterior wall block, wall covering board, ceiling, etc. Plastering gypsum is a new type of building plastering material. It has the characteristics of light weight, heat preservation and temperature adjustment. After it is painted on various walls, it is not easy to shrink and crack. It is a green building material; in addition, hemihydrate gypsum (plaster of paris) ) Is also the most commonly used cementing material. 

2. Casting

Model gypsum model gypsum can be used in casting, fine arts, ceramics and other industries.

3. Agriculture

Gypsum is used to produce sulfuric acid, and then to produce ammonium sulfate fertilizer. Anhydrite can adjust the pH of the soil, improve the soil environment, and can also provide various fertilizers with nutrients such as calcium and sulfur. The application of calcium sulfate (gypsum) during peanut planting not only has a significant effect on increasing the yield of peanuts, but also plays an extremely important role in peanut pest control, efficient fertilization and soil improvement.

4. Food Industry

In food, gypsum can coagulate soybean milk into tofu, and can also be used as a coagulant in canned tomatoes. In recent years, my country's edible gypsum has been exported to South Korea in large quantities. And in beer production engineering, gypsum has a great influence on the non-biological stability and taste quality of beer. In addition, gypsum can also be used as an animal feed additive.

5. Pharmaceutical Industry

Gypsum can be used as medicine. It is widely used in traditional Chinese medicine and Western medicine. It is also called fine stone and water cold stone in Chinese medicine. It is a heat-clearing and purging gunpowder. It mainly treats high fever, polydipsia, lung heat, cough, and stomach fire. Pain and other symptoms; hemihydrate gypsum is mainly used for external use, which can cause muscle sores.

Plaster external fixation technology is still the basic method for clinical treatment of fractures and various diseases that require correction. It has the functions of maintaining, fixing and maintaining the special posture of the affected limb, reducing or eliminating the weight bearing of the affected part.

6. Packing of Plastic and Rubber

After processing, anhydrite can be used as a filler for plastics and rubber. Modified anhydrite filler can improve the mechanical strength, heat resistance and dimensional stability of the polymer. Considering the whiteness, density, refractive index, chemical stability, resources and price, natural raw gypsum and anhydrite can be used as white coatings for papermaking.

7. Production of Calcium Sulfate Whiskers

Gypsum can be converted into calcium sulfate whiskers in an aqueous medium and under high temperature and high pressure conditions. Calcium sulfate whiskers have excellent performance and the lowest price among all whiskers. It can be used as a reinforcing filler in resin-based composite materials, friction materials, adhesives and other industries.

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