Gypsum – Electro Magnetic Industries


Natural gypsum (CaSO4 • 2H2O), also known as gypsum, could be processed into β-hemihydrate gypsum (CaSO4 • 1 / 2H2O) by calcining and grinding, namely building gypsum, plaster or stucco. If the calcination temperature is 190 ° C, we can obtain model gypsum, whose fineness and whiteness is higher than construction gypsum. If natural gypsum is calcined under 400-500 ° C or above 800 ° C temperature, the final material would be flooring gypsum, which clotting, hardening are slow, but the strength, abrasion resistance and water resistance after hardening is better, compared with ordinary building gypsum. Usually selenite is white, colorless or transparent crystal, sometimes due to impurities and ash, the appearance could be yellow, light brown and other colors.

Gypsum production process

At present, our company can design and produce dozens of different specifications gypsum production line. And different production process can be tailored with customers’ different special requirements.

Primary stage

The large size crusher gypsum ore is broken into less than 30mm granule by crushers. Then be delivered to the grinding mill.

Second stage

Gypsum powder production line adopts Chinese domestic mature and advanced process and equipments, such as vertical mill and boiling furnace etc

Third stage

The qualified gypsum powder, which reaches required fineness, could pass separator and is transported into boiling furnace by air to be calcined. The rest big powder would return mill again. Boiling furnace is the most widely used equipment in china in building gypsum process industry. The virtue is its simple structure and easy operation.

Final stage

Calcined gypsum powder would be stored by silo or packed by bags for sale, or transported into following workshop directly.

Equipment needed

The gypsum production line designed by SBM adopts Chinese mature and advanced technical equipments, such as the MTW Series Euro-Type Trapezium Mill, which is the most widely used machine in building gypsum production line grinding part. Its advantages are simple structure, small land occupation, compact construction, big capacity, high-strength material, low consumption and convenient operation etc.

MTW Series Euro-type Trapezium Mill

This grinding machine has a wide usage in metallurgy, construction, chemicals and other mining industries.

LM series vertical Mill

Gypsum plaster flour milling equipment necessary processing equipment, which is not only …

Investment prospects

New building materials have many excellent features, like lightweight, high-strength, insulation, energy conservation, soil conservation and decorative etc.. The new building materials application not only could greatly improve the house function, but also enrich the house more modern feeling from inside and outside, to meet people’s aesthetic requirements. The different performance and function new building material requires, the different raw material and process methods are. For example, some new material could significantly reduce building weight, create good conditions for lightweight structure promotion, and greatly speed up building efficiency. Some focus on colors, such as decoration new material; Some pay more attention to functions, like thermal insulation new material; Some other multiple varieties are derived through deep processing, such as building plate and so on.

Take the New Architecture Board as example, new Architecture Board currently has dozens of varieties. Thereinto, gypsum board, glass fiber reinforced cement (GRC) panels, asbestos-free calcium silicate board have currently Chinese largest production capacity, the most widely usage. These three plates not only use the different raw materials, different production processes, but also have different performance and functions. The material they use is non-metallic materials which are readily available. Treat them as raw sheet, then be mixed by antiseep, heat preservation, fire protection and other functional materials. We could get all kinds of light new wall materials with excellent performance, through composite technology.

Application area

The main use of gypsum

Gypsum is used in a wide variety of applications: Gypsum board is primarily used as a finish for walls and ceilings, and is known in construction as drywall, sheetrock or plasterboard; Gypsum blocks are used like concrete blocks in building construction; Gypsum mortar is an ancient mortar used in building construction; Plaster ingredients are used in surgical splints, casting moulds and modeling; Fertilizer and soil conditioner: In the late 18th and early 19th centuries, Nova Scotia gypsum, often referred to as plaster, was a highly sought fertilizer for wheat fields in the United States. It is also used in ameliorating high-sodium soils; A binder in fast-dry tennis court clay; As alabaster, a material for sculpture, it was used especially in the ancient world before steel was developed, when its relative softness made it much easier to carve; A wood substitute in the ancient world: For example, when wood became scarce due to deforestation on Bronze Age Crete, gypsum was employed in building construction at locations where wood was previously used; A tofu (soy bean curd) coagulant, making it ultimately a major source of dietary calcium, especially in Asian cultures which traditionally use few dairy products; Adding hardness to water used for brewing; Used in baking as a dough conditioner, reducing stickiness, and as a baked-goods source of dietary calcium The primary component of mineral yeast food; A component of Portland cement used to prevent flash setting of concrete; Soil/water potential monitoring (soil moisture); A common ingredient in making mead; In the medieval period, scribes and illuminators mixed it with lead carbonate (powdered white lead) to make gesso, which was applied to illuminated letters and gilded with gold in illuminated manuscripts; In foot creams, shampoos and many other hair products; A medicinal agent in traditional Chinese medicine called shi gao; Impression plasters in dentistry; Used in mushroom cultivation to stop grains from clumping together; Test have shown that gypsum can be used to remove pollutants such as lead or arsenic from contaminated waters.

Mainly used materials

Thixotropic agents


Stick pitch

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