The Effects of Temperature, Vibration and Dosage on the Mill Motor Efficiency of Cement Grinding Ball Mills

Erwin Normanyo, R. A. Ofosu

Abstract


Abstract

Ball mills as used in mining, cement production and allied industries consume about 40% to 56% of the total electric power supplied. Electric power losses in ball mill operations constitute about 25% of the available power. This paper reports on investigations into ball mill motor efficiency evidenced from a cement plant operations perspective. Basic theory was invoked to establish a relationship between electric power consumption and grindability factors. Temperature, vibration and dosage data were collected and analysed. Plots of mill motor efficiency against data-related influential ball mill factors were conducted. Results show that time of day, temperature, vibration and tonnage of ore strongly influence ball mill motor efficiency. Mill motor efficiency was found to decrease in the afternoons. A lowest efficiency of 93% corresponded  to trunnion bearing temperature, pinion bearing temperature, mill motor temperature, mill motor vibration, pinion gear vibration of 46.04 ⁰C, 44 ⁰C, 59 ⁰C, 1.48 mm/s2 and 1.57 mm/s2, respectively. Decrease in any of the influential factors considered improved ball mill efficiency accordingly.   

 

Keywords: Ball mill, Cement Grinding, Mill Dosage, Mill Motor Efficiency, Temperature, Vibration


Keywords


Ball mill, Cement Grinding, Mill Dosage, Mill Motor Efficiency, Temperature, Vibration

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