“An experimental study has been made to evaluate the relationships between grinding parameters and the directional sound levels emitted from the collision of the grinding media with the mill wall for a laboratory batch ball mill.
Discrete frequency and single frequency band sound pressure level measurements were performed to investigate the changes in sound levels with grind time. It was demonstrated that the reduction in sound levels with grind time observed for a narrow sized feed can be used to indicate optimum breakage rates, overall time-based particle size distribution, and ore character.
The relationships established with the discrete frequency and single frequency band monitoring have determined that mill sound levels could be used as an on-line production parameter for a batch mill and as a laboratory indicator of relative grindability.
Multiple frequency band sound power level measurements during the wet grinding of feed materials, having a distribution of particle sizes, has shown that mill sound levels can indicate the actual effective pulp viscosity in the mill and hence permit the identification of the dynamic rheological regime existing within the mill. The results show that the production of fine particles is not directly related to the sound levels. However, rheological transitions from dilatant to pseudoplastic, to pseudoplastic with yield rheology, as identified by the sound levels, are reflected in the fine particle production. It also was shown that mill sound will reflect mill pulp rheology with and without the presence of a grinding additive and for the case where the additive is or is not effective"--Abstract, pages ii-iii.
Watson, John L.
Morris, Arthur E., 1935-
O'Keefe, T. J. (Thomas J.)
Materials Science and Engineering
Ph. D. in Metallurgical Engineering
University of Missouri--Rolla
xv, 170 pages
© 1985 Scott Douglas Morrison, All rights reserved.
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Morrison, Scott Douglas, "An analysis of mill sound levels to aid in the control and understanding of the grinding process" (1985). Doctoral Dissertations. 535.
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