Manufacture of Rapid Hardening Cement The manufacture of rapid hardening cement is done dry process of cement manufacture In this cement lime stone and shale are used as raw material and heated at extremely high temperature to form clinkers The lime and shale clinker is then mixed with small amount of gypsum and grinded very finely to form
2 ·Manufacture of Rapid Hardening Cement The manufacture of rapid hardening cement is done dry process of cement manufacture In this cement lime stone and shale are used as raw material and heated at extremely high temperature to form clinkers The lime and shale clinker is then mixed with small amount of gypsum and grinded very finely to form
The cooled clinkers are ground to a fine powder in ball mill At this time 2 3% of gypsum is added to prevent the early setting of cement Setting and hardening of cement When water mixed with Cement form a plastic paste The past is subjected to hydration and gel and finally crystalline products are formed
·Municipal solid wastes are being increasi ngly used in the cement production process [Stavraki et al 2005] during the hardening process The cement production is based on magnesium oxide
·7 MANUFACTURING Of PORTLAND CEMENT Portland cement is made by heating raw materials rich in oxides of silicon calcium aluminum and iron to temperatures of around 1200 1400o C The chemical reactions that occur within the partially molten mass result from the formation of the four main cement materials Tricalcium silicate CaO 3•SiO2 C3S 45
·Cement Extraction Processing Manufacturing Raw materials employed in the manufacture of cement are extracted by quarrying in the case of hard rocks such as limestones slates and some shales with the aid of blasting when necessary Some deposits are mined by underground methods Softer rocks such as chalk and clay can be dug directly by excavators
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