Abstract
Development of an equation for tumbling charge and balls plus comparison to plant data suggests that the net mill power for cylindrical semiautogenous mills can be calculated from
where mp is in kW; D is internal mill diameter (meters), L is internal mill length (meters); J is total fractional charge loading of the mill; JB is the fractional mill filling by balls; εB is the effective porosity of the charge, taken as 0.3; ρsand ρb are true densities of rock and balls (tons per cubic meter), respectively; wc is the weight fraction of rock in water and rock in the mill, taken as 0.8; and ϕc is the fraction of critical speed. Equations are given for corrections for the conical end sections.
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M&MP paper 88-627. Manuscript Apr. 7, 1988. Discussion of this paper must be submitted, in duplicate, prior to May 30, 1990.
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Austin, L.G. A mill power equation for SAG mills. Mining, Metallurgy & Exploration 7, 57–63 (1990). https://doi.org/10.1007/BF03403284
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DOI: https://doi.org/10.1007/BF03403284