Cement Production and Manufacturing Process
Calcareos materials which can supply CaO. this can be limestone, chalk or marble. Argillaceous material providing silica (SiO 2), alumina (Al 2 O 3) and iron oxide (Fe 2 O 3). Although clay is generally used for this purpose. It can be replaced with materials such as slate, shale, slag from steel manufacture or even burned paddy husk.