Operational results of OK series roller mill

Operational results of a series roller mill, the OK36-4, which was installed at the Ofunato plant of ONODA Cement Co. Ltd. in 1988, are discussed. The maximum capacity and the specific power consumption are 137 t/h and 27.2 kWh/t, respectively, for ordinary cement grinding and 103.3 t/h and 32.8 kWh/t, respectively, for high early strength cement grinding. The quality of both ordinary and high early strength cement was the same as that from conventional tube mills. The mill has been operated stably without any problems due to vibration and wear up to the present. The scale-up policy for the OK mill was confirmed to be adequate to predict a capacity of the OK36-4 mill from that of the OK12-2 mill, which is the smallest among the series