Doctoral Dissertations

Abstract

“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.

Advisor(s)

Watson, John L.

Committee Member(s)

Morris, Arthur E., 1935-
Erten, Hayri
Cummings, A.
O'Keefe, T. J. (Thomas J.)

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Metallurgical Engineering

Comments

The author would like to acknowledge and thank the Department of Metallurgical Engineering and the Arco Foundation for their generous financial and administrative support.

Publisher

University of Missouri--Rolla

Publication Date

Fall 1985

Pagination

xv, 170 pages

Note about bibliography

Includes bibliographical references (pages 144-148).

Rights

© 1985 Scott Douglas Morrison, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 5252

Print OCLC #

14163562

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Metallurgy Commons

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