USA: +1-585-535-1023

UK: +44-208-133-5697

AUS: +61-280-07-5697

55.2 RAW MATERIAL FOR CLINKER PRODUCTION

The essential raw materials for the production of cement are limestone and clay which supply all the four principle ingredients; CaO, Al2O3, SiO2 and Fe2O3. Calcium oxide and iron oxide are obtained from calcareous materials like limestone, chalk, calcium carbonate sluge, etc. Silica and alumina are obtained from siliceous or argillaceous materials like clay, blast furnace slag, slate, etc. The composition of normal portland cement is as under:

Constituents

Per cent

Lime (CaO)

62

Silica (SiO2)

22.5

Alumina (Al2O3)

7.5

Magnesia (MgO)

2.0

Iron Oxide (Fe2O3)

2.5

Sulphur trioxide (SO3)

1.25

Alkalis (Na2O.K2O) from clay

0.5