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Cement

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2 мес. 4 нед. назад #50679 от ahmed
ahmed создал тему: Cement
Cement
Cement is a soft bond that hardens and becomes harsh when mixed with water, making it able to bind concrete components to each other, forming strong building materials and resistant to various environmental influences.Cement is usually made of clay, limestone, There are two types of cement: hydro-cement and non-aqueous cement.

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Cement industry
Cement industry is considered one of the strategic and developmental industries, as it is directly related to the construction and construction. Cement is mainly used in building materials and concrete as a hydraulic bonding material. The cement industry is considered to be one of the simple industries compared to other industries where its industry depends on the availability of raw materials. Cement plants are usually established near raw material sources, to save transportation cost.



Origin of Cement Industry
The origin of the word cement dates back to the Romans, where they called the construction technique they took from the Greeks (OupsCementium), to denote the casting of walls that were stones with lime as a binder material. Watermark, not brick and stone powder.


In 1824, it was found that the cement was considered Roman, but it was not burnt to float. In 1885, cement production began continuously.



Stages of cement industry
Extraction of raw materials from slingshots and quarries.
Transfer raw materials using conveyor tapes or cars to the factory.
Grind raw materials, according to studied ratios, and chemical analyzes, to increase the surface area of ​​the granules, and ready to enter chemical reactions.
Burn crushed raw materials in rotary kilns, at high temperatures, and turn them into clinker.
Packing ready-made cement, in plastic or paper bags.


Raw materials in the cement industry
Limestone.
baby girl.
Silicate sand.
Surface dust.
Bucket dust.
Iron oxides are used as solvents.
gypsum.


Methods of making cement
Wet method:

Crushing of raw materials, from silicate, limestone, clay, and surface dust using crushers, transporting them to the factory for storage in open or covered areas, and later use.
Grinding raw materials, using hanging mills, mixing them with water, and grinding process continues until the raw material is smooth.
Transfer the ground materials in the pendants to storage silos, to adjust the final shape, and obtain a homogeneous mix.
Take a sample of the mixture periodically, and examine it, to make sure the mixture meets the required specifications.
Transfer the mixture to the pans basins, and there it turns the mills into a homogeneous mix.
Pull the homogeneous mix inside the suspensions from the inside of the sink to the feed hole of the rotary kiln, a long cylindrical kiln, slightly tilted from the horizontal plane to push the furnace contents forward while rotating, and lined with thermal bricks from the inside.
Dry the mixture inside the oven by high combustion gases, then cool the clinker with air cooler.
Transfer the dry mix to the core mills, add gypsum to it, and grind it permanently.
Cement packing in bags.

Dry way:

The dry method in the cement industry has replaced the wet method, because of its high precision when mixing raw materials, and because of its energy saving, this method is based on cement industry without adding water as follows:

Crushing raw materials using crushers, and transporting them to the factory for storage.
Dry the raw materials in a rotary dryer by exposing them to the hot air generated by the operation of the oven.
Grinding raw materials in mills, and then transferring them to storage silos, for homogeneous grinding, using stacking and drawing processes.
Transfer of homogeneous raw materials from silos to other types of storage places, then to mixing places, where 30% of clay and 70% of limestone are mixed.
Draw raw materials from storage silos to the feed slot in the primary heating tower to heat them, then cool them to form clinker.
Transfer clinker to core mills, and add gypsum to it.
Cement packing in bags.

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