Discrete element modelling of lifter stresses in tumbling mill

Djordjevic, N. (2003) Discrete element modelling of lifter stresses in tumbling mill. Transactions of The Institution of Mining And Metallurgy Section C-mineral Processing And Extractive Metallurgy, 112 2: C115-C119.

Author Djordjevic, N.
Title Discrete element modelling of lifter stresses in tumbling mill
Journal name Transactions of The Institution of Mining And Metallurgy Section C-mineral Processing And Extractive Metallurgy   Check publisher's open access policy
ISSN 0371-9553
Publication date 2003
Sub-type Article (original research)
Volume 112
Issue 2
Start page C115
End page C119
Total pages 5
Editor Dr S N Dunton (Managing Editor)
Place of publication Leeds, England
Publisher Maney Publishing
Collection year 2003
Language eng
Subject C1
290702 Mineral Processing
640399 Other
Abstract The discrete element code PFC3D has been used to model lifter stresses within a large tumbling mill. The intensity of the induced stresses (shear and normal) is directly proportional to the intensity of lifting action and liner/lifter wear. Results show that, for the modelled case, the magnitude of the stresses decreases as the number of lifters increase. Hence, longer intervals between relining can be expected for a mill with a larger number of lifters. However, it appears that beyond a critical number, a further increase in the number of lifters will not result in significant further reduction of stress. Distribution of the impact energy is also affected by the number of lifters. With very few lifters, the dominant form of energy consumption will be low intensity abrasion events. With larger numbers of lifters, high intensity impacts will be more frequent. Net power draw will be at a minimum for very small numbers of active lifters. As the number of lifters increases, power draw increases and eventually reaches a relatively value. Further work will be required to investigate the effect of lifter shape on the induced stresses. It appears to be possible to determine the number and shape of lifters that will result in the optimal power draw, while simultaneously minimising liner/lifter wear.
Keyword Metallurgy & Metallurgical Engineering
Mineralogy
Mining & Mineral Processing
tumbling mills
lifter stresses
modelling
power consumption
wear
Ball Mills
Q-Index Code C1

 
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