The Bond work index W i as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding ore in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when for a given size of grinding product the value of the work index W i
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Energy Calculation Grinding Barratt 1989 described a method using bond indices than adding a single factor of 125 to arrive at the agsag speci c energy in 1991 the canadians developed the sagpower index spi test using 2 kg of material in a 300 mm diameter mill this test has been furEnergy Calculation Grinding
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