Rod Mill Grinding: Analysis of Size Reduction Kinetics and Material Transport.
NTIS: PB/82-104357 :33 pages
A detailed experimental study of breakage kinetics in a batch rodmill indicates that while the system is inherently nonlinear, the feed disappearance kinetics for the finer sizes and the coarser sizes at high holdups is well represented by first-order behavior. A linearized grinding model that results from the first-order taylor's series expansion of the breakage rate expression was found to give good simulations of the mill product size distributions without recourse to any parameter improvement routine. Material transport through rodmills was evaluated by investigating the effect of operating variables on the holdup and residence time distribution of particulate solids flowing through the mill. Identical experiments performed in a continuous ballmill helped delineate the fundamental differences in particulate transport through these two types of mills. Mechanistic interpretations of the observed transport phenomena are presented, and their implications in the context of tumbling mill analysis and design are emphasized.
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