ball mill discription What is this reference in the discription of a ball mill that says "drawing approximately 0.0011% of the total world's power (see List of countries by electricity consumption)". I don't see anything on the List of countries by electricity consumption that has anything to do with percentage of use by groups of machines.
A survey of 40 industrial mills in Australia found that the maximum ball mill diameter in use was 5.34 metres and length 8.84 metres .Autogenous mills range up to 12 metres in diameter. The length-to-diameter ratios indicated in Table 7.1 for ball mills are for normal use, but for primary grinding the ratio could vary between 1:1 and 1.8:1.