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Cement Clinker
Clinker is a nodular material produced in the kilning stage during the production of cement and is used as the binder in many cement products. The lumps or nodules of clinker are usually of diameter 3-25 mm and dark grey in color. It is produced by heating limestone and clay to the point of liquefaction at about 1400°C-1500°C in the rotary kiln.
Types of Clinker
The most common type of clinker is produced for Portland Cement and its blends. some other special types of cement clinker are:
Sulfate Resistant Clinker , it contains 76% alite, 5% belite, 2% tricalcium aluminate, 16 % tetracalcium aluminoferrite, and 1% free calcium oxide.
White Clinker , it contains 76% alite, 15% belite, 7% tricalcium aluminate, no tetracalcium aluminoferrite, and 2% free lime, but the composition may vary widely. White clinker produces white cement which is used for aesthetic purposes in construction.
Low-alkali Clinker , reduction of alkali content in clinker is done by either replacing the raw-mix alumina source with another component or installing an “alkali bleed”.
Belite Calciumsulfoaluminate Ternesite (BCT) , this concept is used in producing a type of clinker with up to 30% less carbon dioxide emission. Energy efficiency improves and the electricity costs for the manufacturing process are about 15% lower as well.
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The four main components of clinker are:
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