Assessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT system

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dc.contributor.advisorMainza, Aubreyen_ZA
dc.contributor.authorHartmut, Brodneren_ZA
dc.date.accessioned2014-07-31T11:40:58Z
dc.date.available2014-07-31T11:40:58Z
dc.date.issued2013en_ZA
dc.descriptionIncludes bibliographical references.
dc.description.abstractThe research focus of this thesis is lifter height effect on different charge characteristics. Thecharge characteristics identified were shoulder and toe angle, charge size and toe height. Anattempt was made to develop a model for the velocity profile incorporating lifter height.Therefore the objectives of the study are to: •Determine the effect of lifter height on the velocity profile using the particle tracking data. •Determine the effect the lifter height on the charge shoulder and toe. •Develop a velocity profile model including lifter height using granular flow theory and to compare the model to experimental data. The motivation for the study is that lifters are one of the most important design variables in a mill. Without lifters the mill’s energy efficiency would decrease. In Meaders & MacPherson, (1964) the effect of lifters on energy was quantified to be between 20% and 30%. The lifters control the height and angle of departure from the charge at the mill shell and therefore control the impact area and magnitude. The area and magnitude of the charge impact will affect the grind of the mill and energy utilization in the mill. The thesis was also aimed at generating data that can be used to model the velocity profile that can be incorporated in power models. Most of the power models do not account for the effect of lifters. The experiments involved collecting data from three dimensional particle tracking of selected particles in the charge. using the PEPT system. The PEPT experiments were conducted at IThemba Labs in Cape Town South Africa using a 300 mm x 285 mm experimental mill. The charge used for the experiments were glass beads with an approximate specific gravity (SG) of 2.7. The PEPT system operates by tracking the x, y and z coordinates with respect to time of an irradiated particle (tracer). The experiments were run under different conditions to evaluate the effect of the lifter height. The experiments were operated by varying mill speed (55%, 70% and 85%), mill fill (20%, 30% and 40%) and lifter heights (1.5 mm, 3 mm, 6 mm and 10 mm).en_ZA
dc.identifier.apacitationHartmut, B. (2013). <i>Assessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT system</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Minerals Research. Retrieved from http://hdl.handle.net/11427/5613en_ZA
dc.identifier.chicagocitationHartmut, Brodner. <i>"Assessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT system."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Minerals Research, 2013. http://hdl.handle.net/11427/5613en_ZA
dc.identifier.citationHartmut, B. 2013. Assessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT system. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hartmut, Brodner AB - The research focus of this thesis is lifter height effect on different charge characteristics. Thecharge characteristics identified were shoulder and toe angle, charge size and toe height. Anattempt was made to develop a model for the velocity profile incorporating lifter height.Therefore the objectives of the study are to: •Determine the effect of lifter height on the velocity profile using the particle tracking data. •Determine the effect the lifter height on the charge shoulder and toe. •Develop a velocity profile model including lifter height using granular flow theory and to compare the model to experimental data. The motivation for the study is that lifters are one of the most important design variables in a mill. Without lifters the mill’s energy efficiency would decrease. In Meaders & MacPherson, (1964) the effect of lifters on energy was quantified to be between 20% and 30%. The lifters control the height and angle of departure from the charge at the mill shell and therefore control the impact area and magnitude. The area and magnitude of the charge impact will affect the grind of the mill and energy utilization in the mill. The thesis was also aimed at generating data that can be used to model the velocity profile that can be incorporated in power models. Most of the power models do not account for the effect of lifters. The experiments involved collecting data from three dimensional particle tracking of selected particles in the charge. using the PEPT system. The PEPT experiments were conducted at IThemba Labs in Cape Town South Africa using a 300 mm x 285 mm experimental mill. The charge used for the experiments were glass beads with an approximate specific gravity (SG) of 2.7. The PEPT system operates by tracking the x, y and z coordinates with respect to time of an irradiated particle (tracer). The experiments were run under different conditions to evaluate the effect of the lifter height. The experiments were operated by varying mill speed (55%, 70% and 85%), mill fill (20%, 30% and 40%) and lifter heights (1.5 mm, 3 mm, 6 mm and 10 mm). DA - 2013 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 T1 - Assessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT system TI - Assessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT system UR - http://hdl.handle.net/11427/5613 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/5613
dc.identifier.vancouvercitationHartmut B. Assessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT system. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Minerals Research, 2013 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/5613en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentCentre for Minerals Researchen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherEngineeringen_ZA
dc.titleAssessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT systemen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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