Cement manufacturing process

What is cement?Cements are adhesive material that can stitch the Particles together And create a solid object from the particles. The definition of cement is so comprehensive that it can include a variety of adhesives including liquid

adhesives that stitch together pieces of stone or stone and metals are being used. Examples of these adhesives in the cement industry in the refractory brick is used in cement kilns And its main characteristic is that stick the refractory brick (which is a ceramic material) into the furnace body iron . Other types of cement used in dentistry, including adhesives is. What is the word of cement in the text, the origin type of cement is limestone. The main constituent of cement, is  lime and limestone, the main raw material for them.so The cement is  a combination of Calcium oxide (lime) with other oxides such as aluminum oxide, silicon oxide, iron oxide, magnesium oxide and alkaline oxides that have affinity for combining with water in the air and under water, and the resistance is slightly hard.
Due to these characteristics, the cement composition may vary and is basically a water cement . water cement were known from the past Such as lime mortar, which the Egyptians and Greeks by mixing it with volcanic ash, clay bricks and lime juice, they reached to some sort of lime water that it had The property of hardening and By applying the mortar the Romans were able to build large buildings and They still remains loyal and visible after several thousand years.
Cement manufacturing process
Full description cement manufacturing process requires patience and a lot of time, and for this reason we confine ourselves only to name them.
Portland cement raw materials:
Portland cement raw material mainly consists of limestone and clay. This means that the raw materials used in the production of Portland cement contain calcium carbonate and compounds of silicate aluminum.
Extraction of raw materials:
Mines of  cement raw materials, including limestone, clay, Marley, gypsum and like these, is  an barefaced Mine. The extraction of materials such as limestone, iron ore and gypsum are also drilling and blasting with dynamite.
Primary crushing mode: by moving crusher or stationary crusher
Initial mixing and storage
Before the material that were crushed in the crusher, send to the mill to change to the powder, then dumped into the hall to be mixed with each other and, also  the lounge has a role in warehouse and storage.
Drying of raw materials
In some cement plants, because of the special geographical position and rich rain, some raw materials (especially clay), moisture levels are not possible to direct use from them.
Powder mixture of raw materials: In the dry method of cement production, It is necessary that the raw materials before entering the furnace are powdered that is done By Mill for raw ball materials and mills for roller raw materials.
Regulation of raw materials
Silos for raw materials
The main actions that are  effective in Working uniform furnace, raising the quality of clinker, and  Finally cement, are Uniform compound feed the furnace, well mixed and homogenous.
Rotary kiln
The main part of the action takes place in the oven to bake. Cement kiln, which is a metal cylinder, its  length and diameter, is according to the capacity of the plant .
Clinker kiln exit temperature is about 1000 to 1200 degrees. Restore the amount of heat and the difficulty of moving the hot clinker, requires necessity to cool it. Another major effect of cooling the clinker, is clinker completing  and the formation of crystals and high quality of it.
Silo (warehouse) of clinker
The output clinker of cooler, before entering the  cement mill, stores in silo or warehouse or stored hall.

Cement mill
Cement silos
Loading house
methods of Constructing Cement
Basically, there are four methods of cement production

1. wet method
2. semi wet method
3. semi-dry method
4. dry method

wet method and semi wet method
In wet method and semi wet method, the used clay in the wash mill machine, change into Grout. Then the Grout of clay, With limestone and soft Mill material is mixed into a slurry with higher concentrations. After the adjustments required by the laboratory, it is consumed as the feed of klin.in semi wet method, Emissions coming out from Mill is like slurry material And filtered before entering the oven by pressing, and  the water is taken and feed the klin like a cake or cube.
Semi dry method
In Semi dry method the dry raw materials are mixed together and feed the mill of raw materials. The  materials coming out of the klin are like powder. Before feeding the klin with this powder, some water Pour on it and change it to cube or cake and then feed the klin.
Dry method
In dry method the dry materials enters the mill . The powder coming out of the mill ,after regulation is Consumed as the feeding of the klin.
There are several methods for producing cement that is mainly depends on the technology used and the type of cement. Technology used for cement production has gradually evolved and progressed. The cement industry is wonderful with the latest techniques, and using the dry methods and helping automatic systems, has  witnessed tremendous advances in the 160 year history of manufacturing its own. Some of the cement production process like Alumina Cement, entirely is different from Production method of Portland cement.



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