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Browsing by Author "Franzidis, Jean-Paul"

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Beneficiation of fine coal using the air-sparged hydrocyclone

Author: Breed, Ashley Wayne Date: 1992 The Air-Sparged Hydrocyclone (ASH) is a high capacity flotation device which is alleged to be more efficient for the flotation of fine particles than conventional flotation equipment. The principal aims of this thesis were to investigate the ... Read more
Characterising the acid mine drainage potential of fine coal wastes

Author: Kotelo, Lerato Olga Date: 2013 Acid mine drainage (AMD) is one of the major environmental challenges facing the South African mining sector. Acid mine drainage has received significant public attention in recent years. South Africa's long mining history has led to a growing ... Read more
Combining froth flotation and reflux classification to mitigate ARD generating potential of the Waterberg and Witbank coal ultrafines via sulfide removal

Author: Iroala, Onyinye Judith Date: 2014 In South Africa, over 10 million tons of ultrafine coal wastes are discarded every year, typically in the form of ultrafine slurries. These fines have a high calorific value, and contain sulfur minerals, particularly pyrite. The high calorific ... Read more
Developing a mechanistic model for flow through a perforated plate with application to screening of particulate materials

Author: Ogunmodimu, Olumide Date: 2016 Screening in mineral processing is the practice of separating granulated ore materials into multiple particle size fractions, and is employed in most mineral processing plants. Models of screening performance have been developed previously ... Read more
Development of a fine coal beneficiation circuit for the Twistdraai Colliery

Author: Bunt, John Reginald Date: 1997 The principal aim of this thesis was to develop a fine coal beneficiation circuit for the Twistdraai Colliery capable of achieving.a saleable 10.0% ash (28 MJ/kg CV) product. Gravity circuit testing involved a comparative study of a conventional ... Read more
Dreams come true: youth entrepreneurs in eSikhawini township, Richards Bay

Author: Manqoyi, Ayanda Date: 2016 This research project examines the emergence of youth entrepreneurs in the moments just before mining and industrial activities develop within a community. It focuses on how young people engage with the hopes and promise of opportunities ... Read more
An economic analysis of coal desulpharisation by froth flotation to prevent acid rock drainage (ARD) and an economic review of capping covers and ARD treatment processes

Author: Jera, Melody Kudzai Date: 2013 Acidic drainage as a result of mining and mineral processing activities is a growing concern. The effects of Acid Rock Drainage (ARD) include environmental pollution in the affected areas and beyond. As South Africa has water challenges, the ... Read more
The effect of conditioning on froth flotation

Author: Henwood, Daryl Date: 1995 The method and extent to which mineral slurries are conditioned have been shown to greatly affect flotation grades and recovery. Most of this work is very mineral specific and centres around one or two operating variables. One of the major ... Read more
Effect of HPGR on platinum bearing ores and the flotation response as compared to the conventional ball mill

Author: Solomon, Nomonde Date: 2011 This thesis focuses on the application of the high pressure grinding rolls (HPGR) on platinum bearing ores Merensky, UG2 and Platreef. Conventional tumbling mills such as the ball mill that are typically applied on these ore types are highly ... Read more
Hydrodynamics and gas dispersion in industrial flotation cells

Author: Egya-Menash, Daniel Date: 1999 Solids suspension and gas dispersion studies were performed on a total of 40 industrial flotation cells of various types, sizes and duties in a Platinum Group Metal (pgm) concentrator in the North West Province of South Africa. The wide variety ... Read more
Improving the selectivity of the radio-labelling of ion exchange resin tracers for positron emission particle tracking

Author: Van Heerden, Michael Rudi Date: 2015 Positron emission particle tracking (PEPT) is a technique which non-invasively tracks tracer particles labelled with a positron emitting radionuclide in a system of flow. The tracers are tracked through the detection in a PET scanner, of the ... Read more
Investigating depressant behaviour in the flotation of selected Merensky ores

Author: Wiese, Jennifer Gael Date: 2009 This study utilised laboratory batch flotation tests to characterise the flotation performance, with respect to sulfide and gangue minerals, of two Merensky ores with different mineralogy, in the presence of depressants; and contributes to ... Read more
An investigation of particle collection efficiency in different particle-bubble contacting environments in flotation

Author: Breytenbach, Jacobus Nicolaas Date: 1995 The collection efficiency of quartz particles in four different particle-bubble contacting environments was investigated during this thesis. Flotation experiments were carried out in a hybrid flotation column that could be modified into three ... 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 effect of different frother blends on the flotation of selected PGM bearing ores

Author: Ngoroma, Faustine Date: 2015 Concentrators processing platinum group mineral (PGM) bearing ores use polysaccharide depressants to reduce the recovery of the naturally floatable gangue minerals (mainly silicates) present in the ores. Recent work has shown that high ... Read more
Investigation of the effect of mineralogy as rate-limiting factors in large particle leaching

Author: Ghorbani, Yousef ; Becker, Megan ; Petersen, J ; Franzidis, Jean-Paul Date: Oct 2013 Although heap leaching is by now well established in the mining industry, the process remains limited by low recoveries with different rate-limiting factors that are not clearly understood. In this study, three large particle size classes ... Read more c b
Large particle effects in chemical/biochemical heap leach processes - A review

Author: Yousef, Ghorbani ; Becker, Megan ; Mainza, Aubrey ; Franzidis, Jean-Paul ; Petersen, Jochen Date: 2011 The application of heap leach technology to recovery of economically important metals, notably copper, gold, silver, and uranium, is wide-spread in the mining industry. Unique to heap leaching is the relatively coarse particle size, typically ... Read more
Large particle effects in chemical/biochemical heap leach processes – A review

Author: Ghorbani, Yousef ; Becker, Megan ; Mainza, Aubrey ; Franzidis, Jean-Paul ; Petersen, Jochen Date: 2011 The application of heap leach technology to recovery of economically important metals, notably copper, gold, silver, and uranium, is wide-spread in the mining industry. Unique to heap leaching is the relatively coarse particle size, typically ... Read more
The liberation characteristics of Greenside No. 2 seam coal

Author: Harris, Martin Colquhoun Date: 1987 In South Africa, ever increasing quantities of fine (-0,5 mm) coal are being produced as a result of the increased use of mechanised mining methods. Very few mines beneficiate the fines; in most cases they are discarded. However the fine size ... Read more
A liberation study on ultrafine South African coals

Author: Buys, Irmtraud Erna Date: 1989 South African coal mines generate large quantities of fines as a result of the increased use of mechanised mining methods. Generally, these fines are discarded. They do however contain relatively large proportions of high grade material, which ... Read more

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