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Browsing by Author "Mainza, Aubrey Njema"

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Contribution to the understanding of the three-product cyclone on the classification of a dual density platinum ore

Author: Mainza, Aubrey Njema Date: 2006 The detrimental effects exhibited by the conventional hydrocyclone in classifying ores that contain different density components motivated the AMIRA P9 project to look into modifications to the conventional hydrocyclone that can improve ... Read more
Developing a methodology for characterising in-situ viscosity profiles in tumbling mills

Author: Mangesana, Nobathembu Date: 2012 Milling is the most expensive operation in a mineral processing circuit and accounts for the highest amount of energy utilized. The efficiency of the milling process is affected by the rate of breakage of bigger rocks and the rate of transport ... Read more
Development of a wet fine screen model integrating the effect of operating and design variables on screening performance

Author: Mabote, Seipati Date: 2016 Mineral processing is the process that involves liberation and beneficiation of valuable constituents of an ore. Several physical beneficiation processes exist and one such process is classification. Screens are classification devices sometimes ... Read more
Effect of operating variables on IsaMill™ performance using platinum bearing ores

Author: Chaponda, Brian Date: 2011 Comminution involves crushing and grinding operations. The grinding operations use the traditional tumbling mills and stirred mills to reduce the ore to the required fineness. This thesis intends to investigate the influence of design and ... Read more
A granular flow model of an annular shear cell

Author: Bremner, Sherry Date: 2016 Machinery such as an IsaMillTM used in communition to produce fine particle sizes that allow minerals to be extracted are best modelled using granular flows. A single rheological description that captures all the features of granular flows ... Read more
Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles

Author: Ghorbani, Yousef ; Petersen, Jochen ; Becker, Megan ; Mainza, Aubrey Njema ; Franzidis,Jean-Paul Date: Jan 2013 X-ray Computed Tomography (CT) was used to follow the progression of Zn leaching in a number of individual sphalerite ore particles, which were subjected to a long-term simulated heap bioleaching environment. The ore was prepared by two ... Read more
Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps

Author: Ghorbani, Yousef ; Petersen, J ; Becker, Megan ; Mainza, Aubrey Njema ; Franzidis, Jean-Paul ; Kalala, JT Date: 2013 The application of comminution technology such as the High-pressure grinding rolls (HPGR), which is able to generate a high density of cracks in the ore particles, is favourable for leaching processes. Extraction of metallic values by the ... Read more c b
Investigation of the flotation behaviour of ball mill and IsaMill products

Author: Khonthu, Tsepang Date: 2012 Valuable minerals that are used in various aspects of everyday life are buried in fossilised storages below the ground in the earth's crust. These minerals are mined as rocks which then have to be crushed in order to liberate these minerals ... Read more
A mathematical model for predicting classification performance in wet fine screens

Author: Mwale, Adolph Ntaja Date: 2015 Screening is a well-known classification process in the minerals processing industry. The process involves separation of fine particles from coarse particles based on size and is applicable to both dry and fine screening. Fine screening is ... Read more
Using positron emission particle tracking (PEPT) to investigate the motion of granular media in a laboratory-scale tumbling mill

Author: Morrison, Angus James Date: 2012 Positron emission particle tracking is a Lagrangian, single particle tracking technique in which the trajectory of a representative tracer particle is triangulated from the decay products of the positron-emitting radioisotope with which it ... Read more