proven to grind more efficiently than ball mills with feeds as coarse as 6 mm to products finer than 20 microns. in addition to grind efficiency, reduced media consumption, lower installation cost, minimal maintenance, and minimal liner wear make the vertimill the lowest total cost of ownership in many applications,
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the number of impacts in primary ball mills are far more frequent but have less magnitude than those experienced in sag mills. the increased frequency is due to the increase in charge volume 35 40% versus 5 10% , higher mill speeds, and the larger number of balls per unit charge weight.
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gold fields . an equivalent new 2.5mw ball mill would cost an estimated $4.5 million with spares and take up to 40 weeks from order to delivery. the total cost of the 2.5mw ani- ruwolt ball mill, fully refurbished is expected to be approximately $0.9 million and will take an estimated 12 weeks to be ready for installation.