Nov 15, 2016 · Manufacture of Portland cement. Raw materials Calcareous material – such as limestone or chalk, as a source of lime (CaO). Clayey material – such as clay or shale (soft clayey stones), as a source of silica and alumina. Methods of cement manufacturing. Wet process: Grinding and mixing of the raw materials in the existence of water.
The milling process generates heat and excessive mill temperatures are undesirable. It is clearly helpful, therefore, if the clinker is cool as it enters the mill. From an environmental and a cost viewpoint, the cooler reduces energy consumption by extracting heat from the .