What are the ingredients of gypsum?

Question 1: What are the ingredients of gypsum? Types and Uses of Gypsum for Construction The most common type of gypsum used in construction is structural gypsum, followed by model gypsum. In addition, there are high strength gypsum, anhydrous gypsum cement and floor gypsum. The raw material for gypsum production is mainly natural dihydrate gypsum, also known as soft gypsum or raw gypsum, which is calcium sulfate containing two crystal waters. Natural dihydrated gypsum can be used to produce gypsum with various properties. The main processes for producing gypsum are heating and grinding. Due to different temperatures and heating methods, gypsum with different properties can be produced. (l) Building Gypsum Building gypsum is a white powder obtained by calcining mature gypsum and other raw materials such as natural gypsumurel hydrated at a temperature of 107°C to 170°C, then grinding it finely. Its main component is hemihydrated gypsum type B. After curing, construction gypsum has good thermal insulation and sound absorption properties as well as good fire retardant and moisture absorption properties. It is white in color and can be used for the construction of interior paints, particularly suitable for the manufacture of various types of plaster. White flower decoration, smooth and delicate, if pigments are added, the product can have different colors. Construction gypsum should not be used in exterior projects and high temperature projects above 65°C. In short, construction gypsum can be used for interior painting, manufacturing of decorative products, porous gypsum products and plasterboards, etc. (2) Plaster of Paris produced by calcination of gypsum dihydrate of model gypsum If theimpurity content is low and the SKI is whiter and the powder finer, it is called model gypsum. It hardens faster than construction plaster and is more durable. Mainly used for making models, sculptures, decorative flowers, etc. (3) High-strength gypsum is produced by placing hydrated gypsum H in a pressure steam cooker and vaporizing it at an atmospheric pressure of 1.3 (124°C). Type A semi-hydrated gypsum has high strength after being finely ground. This gypsum has high density and strength after hardening. High strength gypsum is suitable for plastering projects, decorative products and plasterboards with high strength requirements. After incorporating a waterproofing agent, its products can be used in high humidity environments. It can also be added to an organic solution to form a binder. (4) Gypsum cement anhydrous When natural dihydrate gypsum is heated between 400°C and 750°C, the gypsum will completely lose water and become insoluble anhydrite. After mixing with appropriate amount of activator and grinding into fine particles, it becomes. anhydrous gypsum cement. Anhydrous gypsum cement is suitable for interior use, mainly used to make plasterboard or other products, and can also be used for interior plastering. (5) Soil gypsum If natural gypsum dihydrate is calcined above 800°C, part of the calcium sulfate will decompose into calcium oxide, and the finely ground product is called high temperature calcined gypsum, also known as floor gypsum name. After curing, gypsum for flooring has high strength, wear resistance and good water resistance, so it is mainly used as gypsum flooring and interior floor decoration. Other Foud answersre, thunder and rain 2009-01-17 20:28:52 Gypsum is a monoclinic mineral whose main chemical component is calcium sulfate (CaSO4). Gypsum is a widely used industrial and construction material. It can be used as cement retarder, gypsum building products, model making, medical food additives, sulfuric acid production, paper putty, paint putty, etc. Natural gypsum dihydrate (CaSO42H2O) is also called raw gypsum. After calcination and grinding, β-type semi-hydrated gypsum (.CaSO41/2H2O), which is construction gypsum, also called plaster of Paris and stucco. If the calcination temperature is 190°C, model gypsum can be obtained, and its fineness and whiteness are higher than that of building gypsum. If the raw gypsum is calcined at 400-500°C or at a temperature above 800°C, floor gypsum will be obtained. Its setting and hardening are slower, but its resistance, its resistanceWear resistance and water resistance after curing are better than ordinary building gypsum. lilisz16 2009-11-04 22:18:59 Chemical name: Calcium sulfate Chemical formula CaSO4. The formula quantity is 136.14. White solid. Density 2.61 g/cm3. Melting point 1450℃. The one with two crystal water molecules is called gypsum or gypsum (CaSO4?2H2O). When gypsum is heated to 150-170°C, most of the crystallized water is lost and becomes gypsum (CaSO4?1/2H2O). The solubility of CaSO4 is not great, and its solubility presents a particular phenomenon of increase and then decrease. For example, the solubility at 10°C is 0.1928 g/100 g water (the same below), at 40°C it is 0.2097 and at 100°C it goes down to 0.1619 . Usage: It can be used as polishing powder, paper putty, gas desiccant and medical dressing. It is also used in metallurgy and agriculture. Gypsum is also used in crownsnteries to regulate the cement setting time. Method of preparation: Generally produced naturally. Also a by-product of the phosphate industry and some other industries. Calcium sulfate (CaSO4) is a colorless orthorhombic or monoclinic crystal. The melting point of monoclinic crystal is 1450°C, 1193...>>

Question 2: The main thing. gypsum ingredients What is the component of calcium sulfate, chemical formula CaSO4. The melting point is 1450℃, the relative density is 2.96, and it is difficult to dissolve in water. Its dihydrate CaSO4?2H2O is commonly called gypsum (or raw gypsum).

The hemihydrate CaSO4?1/2H2O is called plaster of Paris (or calcined gypsum).

Gypsum is a mineral that is a monoclinic crystal in the form of plates or fibers, or in the form of fine-grained blocks, in the form of light gray, reddish, light yellow or light blue. When gypsum is heated to 128°C, it loses the majhas part of its crystalline water and becomes gypsum above 163°C, all the crystalline water is lost. Plaster of Paris powder becomes plastic when mixed with water, but quickly hardens and reverts to gypsum. This process releases a lot of heat and expands, so it can be used to cast models and sculptures. Calcium sulfate and gypsum can be used as raw materials for the joint production of sulfuric acid and cement, and can also be used as white pigments for paints, fillers for paper, and coagulants for tofu.

Question 3: What are the main components of gypsum? Is it harmful to the body? The main ingredient is calcium sulfate, which is harmless in terms of danger!

Question 4: What are the main components of gypsum? Is it toxic? Generally speaking, gypsum includes two natural productsls based on calcium sulfate: gypsum and anhydrite. Gypsum is calcium sulfate dihydrate and anhydrite is calcium sulfate anhydrous

CaS04?2H20

Gypsum has a wide range of uses: food, medicinal, agricultural , etc.

Gypsum cannot be consumed directly. But it is not toxic and has the effect of extinguishing fire and relieving heat. Look, the gypsum with tofu that you talked about is edible gypsum.

Question 5: What are the ingredients of medical plaster? How is it different from regular plaster? 5 points Calcium sulfate is the main component of gypsum.

Question 6: What is the chemical composition of construction gypsum? What are the features? How to cope? Natural stone is also called raw gypsum CaSO4.2H2O

Paris gypsum is a mixture of raw gypsum and anhydrous gypsum, generally CaSO4.1/2H2O

Gypse anhydrous CaSO4.H2O

Types and Uses of Building Gypsum

The most common type of gypsum used in construction is building gypsum, followed by model gypsum. In addition, there are high strength gypsum, anhydrous gypsum cement and construction gypsum. plaster on the floor.

The raw material for gypsum production is mainly natural dihydrate gypsum, also known as soft gypsum or raw gypsum, which is calcium sulfate containing two crystal waters. Natural dihydrated gypsum can be used to produce gypsum with various properties.

The main processes for producing gypsum are heating and grinding. Due to different temperatures and heating methods, gypsum with different properties can be produced.

(l) Building gypsum

Building gypsum is a white product made by calcining mature gypsum and other raw materialssuch as natural gypsum hydrated at a temperature of 107°C to 170°C. °C, then grind it into fine pieces of powder. Its main component is hemihydrated gypsum type B.

After curing, construction gypsum has good thermal insulation and sound absorption properties, good fire resistance and absorption properties. humidity; It is white in color and can be used for interior paint construction, especially suitable for the manufacture of various types of materials. plaster. White flower decoration, smooth and delicate, if pigments are added, the product can have different colors.

Construction gypsum is not suitable for exterior projects and high temperature projects above 65°C.

In short, construction gypsum can be used for interior painting, manufacturing of decorative products, porous gypsum products and plasterboards, etc.

(2) The platre de Paris produced by calcination of gypsum dihydrate of model gypsum If the impurity content is low and the SKI is whiter and the powder is finer, it is called model gypsum. It hardens faster than construction plaster and is more durable. Mainly used for making models, sculptures, decorative flowers, etc.

(3) High-strength gypsum is produced by placing H-hydrated gypsum in a pressure steam cooker and steaming it at an atmospheric pressure of 1.3 (124°C ). Type A semi-hydrated gypsum has high strength after being finely ground. This gypsum has high density and strength after hardening. High strength gypsum is suitable for plastering projects, decorative products and plasterboards with high strength requirements. After incorporating a waterproofing agent, its products can be used in high humidity environments. IIt can also be added to an organic solution to form a binder.

(4) AnhydriteGypsum Cement

When natural dihydrate gypsum is heated to 400℃~750℃, the gypsum will completely lose water and become insoluble anhydrite. After mixing it with appropriate amount of activator and grinding it, it becomes anhydrous gypsum. . cement. Anhydrous gypsum cement is suitable for interior use, mainly used to make plasterboard or other products, and can also be used for interior plastering.

(5) Soil gypsum

If natural gypsum dihydrate is calcined above 800°C, part of the calcium sulfate will decompose into calcium oxide and the product finely ground is called high calcium oxide. calcined gypsum at temperature, also known as floor plaster. After curing, gypsum for flooring has high strength, wear resistance and good resistance.water resistant, so it is mainly used as gypsum flooring and interior floor decoration.

CaS04?2H20

Generally speaking, gypsum comprises two natural calcium sulfate products: gypsum and anhydrite. Gypsum is calcium sulfate dihydrate, anhydrite is calcium sulfate anhydrous

CaS04?2H20

The main component of natural gypsum is CaSO4?2H2O

In the recycling industry, it is mainly used in cement, plasterboard decoration materials and new blocks gypsum

Gypsum has a wide range of uses.