Manufacturing

Manufacturing

The limestone obtained from captive mines is enriched with higher quality limestone procured from nearby states as and when required. The raw mix normally contains 95% limestone and 5% laterite. The raw materials are crushed to around 20-25 mm size and the proportioned raw materials are ground in a ball mill in dry condition to a very fine powder. The resultant product is called raw meal and is stored in concrete silos where it is pneumatically homogenized to get a uniform product.

Cement is produced by grinding clinker with 3 to 5% gypsum in a closed circuit ball mill to required fineness. Gypsum is added to control the setting properties of cement. Grinding clinker and gypsum produces ordinary Portland cement (OPC). Fly ash / Slag at required proportion is ground along with clinker and gypsum to produce Portland Pozzolana cement (PPC) / Portland slag cement (PSC). The ground cement is stored in concrete silos and packed in 50kg bags using electronic packing machines.