Aspects in Mining & Mineral Science

A Granular Flow Model for Tumbling Mills: Dry Mill Power
  • Open or Close Tupper GB1,2*, Govender I3, Richter MC4 and Mainza AN4

    1Department of Physics, University of Cape Town, South Africa

    22Associate Member, National Institute for Theoretical Physics, South Africa

    3Department of Chemical Engineering, University of KwaZulu-Natal, South Africa

    4Department of Chemical Engineering, University of Cape Town, South Africa

    *Corresponding author: Tupper GB, Department of Physics, University of Cape Town, South Africa, Email: gray.tupper@uct.ac.za

Submission: March 19, 2018; Published: March 29, 2018

Volume1 Issue4
March 2018


We develop a simple granular flow model for the dissipative power density and power draw in dry tumbling mills. The model is based on a Herschel-Buckley like granular rheology with a yield stress proportional to the pressure. Data obtained from Positron-Emission-Particle-Tracking is used to correlate dependence on fill, speed and lifters.

The shrinking core model for the diffusion was established to control the mechanism with surface chemical reaction as the rate controlling step for the dissolution process.

Keyword: Power; Efficiency; Granular; Rheology; PEPT

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