An energy based, ore specific model for autogenous and semi-autogenous grinding mills

Leung, Kam (1988). An energy based, ore specific model for autogenous and semi-autogenous grinding mills PhD Thesis, School of Engineering, The University of Queensland.

       
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Author Leung, Kam
Thesis Title An energy based, ore specific model for autogenous and semi-autogenous grinding mills
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 1988
Thesis type PhD Thesis
Supervisor W.J. Whiten
Language eng
Subjects 290500 Mechanical and Industrial Engineering
Formatted abstract
A model of autogenous and semi-autogenous grinding mills has been developed which can be used to predict the performance of different ore types in mills of different size.

The approach was based on ore specific appearance functions. Pendulum and tumbling tests on ore samples were conducted to describe quantitatively the high and low energy breakage of different ore types. The energy levels in a mill were related to the mill diameter and charge. The effect of energy level on breakage was obtained from the pendulum tests. The laboratory results were complemented by operating data. Plant tests were conducted on mills at three different installations. Data and samples were also obtained from earlier tests on a different ore type in one of these mills. The initial model development ignored secondary effects such as mill discharge density and circulating loads. These were included specifically in models for two cases.

The model was used to simulate n e w data not used in the original model development. After quantifying the effects of mill discharge density a nd circulating load, the model accurately predicted product size distributions for all of these additional surveys. No load sizings were available for any of these data but the model load predictions were of similar form to other observed load size distributions. Applications of the model for design and optimisation of circuits using simulation techniques are demonstrated.
Keyword Autogenous grinding
Milling machinery
Additional Notes Other Title: Model of autogenous and semi-autogenous grinding mills.

Document type: Thesis
Collection: UQ Theses (RHD) - UQ staff and students only
 
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