Cement : Manufacture, Chemical Composition, Heat of Hydration
then fed together into a mill where the rock is ground until more than 85% of the material is less than 90#181;m in diameter. Manufacture of Portland Cement The wet process : The clay is mixed to a paste in a washmill a tank in which the clay is pulverised in the presence of water. Crushed lime is then added and the whole mixture further ground. Any material which is too coarse is extracted and