Cement Energy & Environment

39 Fig-10: UltraTech Hirmi – Process sheet of ball mill upgrade with Roller Press circuit THE PROCESS FLOW SHEET (FIG-10) OF TOTAL CIRCUIT IS SHOWN BELOW: Following performance guarantees (Table-4) with delta increase in production and delta decrease in sp. power consumption were agreed for OPC and PPC in the contract. During the performance guarantee, UltraTech cement can chose any one of the products for performance demonstration. Table-4: UltraTech Hirmi – Performance figures as per contract document S. No. Parameter OPC (with grinding aid) PPC (with grinding aid) 1 Feed mix 91.5% clinker 3.5% gypsum 5% Performance improver 61.5% clinker 3.5% gypsum 35% dry Fly ash 2 Fly ash feed fineness - 3500 cm2/gm 3 Production 290 tph (delta increase of 150 tph) 380 tph (delta increase of 190 tph) 4 Product fineness 2900 cm2/gm 18% R45 3500 cm2/gm 18% R45 5 Sp. power consumption at meters (for complete grinding circuit from hoppers discharge to cement silo feeding elevator discharge) 29.3 kWh/t at meters (delta decrease of 4.5 kWh/t) 23.2 kWh/t at meters (delta decrease of 3.3 kWh/t)