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minerales semiautogenos autogenos

An autogenous mill of ID 6.7. m and an effective grinding length of 2.1 m was fed with ore of SG 3.8 to 20 of its volume.. The mill was operated continuously 24 hours per day at 1200 t per day and 75 of the critical speed.The solids in the mill charge were at 80 solids. Estimate:1. The power consumption per tonne per day.