Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns

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dc.contributor.advisorO'Connor, Cyril Ten_ZA
dc.contributor.authorMills, Peter John Templeen_ZA
dc.date.accessioned2016-09-28T19:06:05Z
dc.date.available2016-09-28T19:06:05Z
dc.date.issued1992en_ZA
dc.descriptionBibliography: pages 181-189.en_ZA
dc.description.abstractColumn flotation has gained worldwide acceptance in the minerals processing industry in the past decade. This has been due the operating characteristics of flotation columns which can produce improved grades and recoveries over conventional cells. Added to this, flotation columns are both simple to operate and generally less expensive than the equivalent requirement of conventional cells. Flotation columns are able to produce improved results due to a deep washed froth phase and a quiescent pulp phase in which the pulp interacts countercurrently with the air bubbles. Models describing the behaviour of particles in both of these phases have been developed over the past decade. The present study focusses specifically on the pulp phase and models presently used to describe the pulp zone hydrodynamics and kinetics are evaluated and improved. The hydrodynamics of the pulp or collection zone are evaluated using data obtained from three residence time distribution (RTD) studies performed on two pilot columns (5.4cm and 5.8cm diameter) and an industrial column (120cm diameter). Sodium chloride liquid tracers as well as radioactively labelled solid and liquid tracers were used in the RTD studies. In the study performed on a pilot column using the salt tracer the degree of mixing was found to increase both with increasing gas rate at constant bubble size and decreasing bubble size at a constant gas rate. This increase in mixing is attributed to the increase in the number of bubble$ and the subsequent increase in the tracer-bubble interactions. By extrapolating this result to industrial columns it is clear that flotation columns, which have smaller and substantially more bubbles, will be more mixed than bubble columns.en_ZA
dc.identifier.apacitationMills, P. J. T. (1992). <i>Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/21987en_ZA
dc.identifier.chicagocitationMills, Peter John Temple. <i>"Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 1992. http://hdl.handle.net/11427/21987en_ZA
dc.identifier.citationMills, P. 1992. Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mills, Peter John Temple AB - Column flotation has gained worldwide acceptance in the minerals processing industry in the past decade. This has been due the operating characteristics of flotation columns which can produce improved grades and recoveries over conventional cells. Added to this, flotation columns are both simple to operate and generally less expensive than the equivalent requirement of conventional cells. Flotation columns are able to produce improved results due to a deep washed froth phase and a quiescent pulp phase in which the pulp interacts countercurrently with the air bubbles. Models describing the behaviour of particles in both of these phases have been developed over the past decade. The present study focusses specifically on the pulp phase and models presently used to describe the pulp zone hydrodynamics and kinetics are evaluated and improved. The hydrodynamics of the pulp or collection zone are evaluated using data obtained from three residence time distribution (RTD) studies performed on two pilot columns (5.4cm and 5.8cm diameter) and an industrial column (120cm diameter). Sodium chloride liquid tracers as well as radioactively labelled solid and liquid tracers were used in the RTD studies. In the study performed on a pilot column using the salt tracer the degree of mixing was found to increase both with increasing gas rate at constant bubble size and decreasing bubble size at a constant gas rate. This increase in mixing is attributed to the increase in the number of bubble$ and the subsequent increase in the tracer-bubble interactions. By extrapolating this result to industrial columns it is clear that flotation columns, which have smaller and substantially more bubbles, will be more mixed than bubble columns. DA - 1992 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1992 T1 - Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns TI - Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns UR - http://hdl.handle.net/11427/21987 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21987
dc.identifier.vancouvercitationMills PJT. Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 1992 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21987en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemical Engineeringen_ZA
dc.titleModelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columnsen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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