Role of Energy Split Factors in the Ball Mill Grinding of Multicomponent Feeds in Heterogeneous Environments.
Fuerstenau-DW; Abouzeid-AZM; Vakil-K; Kapur-PC
Proc 7th European Comminution Symp Yugoslavia Eur Fed Chem Eng Pub Ser 85 PP 565-576 :565-576
An energy split factor is defined as the ratio of energies consumed per unit mass when a mineral is ground in a mixture or an otherwise heterogeneous environment and ground alone for identical time intervals. This factor can be estimated from the initial rate of production of fines or from data for topsize feed particles remaining unbroken as a function of time, provided the trajectory of the size spectra of comminuted particles remains invariant in the two grinding modes. The energy split factor is a useful index of the complex interaction between the components of the mixture and the effect of heterogeneous environment in the mill. It provides a rational and consistent basis for tracking the effective flow of energy to various constituents of the grinding charge and hence leads to a formal integration of the energetic and kinetic aspects of multicomponent grinding. For illustration and verification purposes, many sets of dry and wet ball mill grinding data for feeds comprised of calcite-quartz, hematite-quartz, and dolomite-hematite mixtures in different proportions have been employed. Using these split factors, nonlinear interaction effects are quantified, grinding energies of the mixtures are accurately computed, and kinetics of mixture grinding are simulated.
Proc 7th European Comminution Symp, Yugoslavia; Eur. Fed. Chem. Eng. Pub. Ser. 85, PP. 565-576
Unversity of CA.--Berkeley