Browsing Research Output by Author "Campbell, Q.P."
Now showing items 1-18 of 18
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Air drying of fine coal in a fluidized bed
Le Roux, M.; Campbell, Q.P.; Van Rensburg, M.J.; Peters, E.S.; Stiglingh, C. (SAIMM, 2015)The demand for energy has continued to rise worldwide in line with population growth. The majority of South Africa’s electricity is supplied by coal-fired power stations. The amount of fine coal (-2 mm) generated at coal ... -
Beneficiation of small South African coal using an air dense medium fluidized bed
Diedericks, E.S. (Peters); Le Roux, M.; Campbell, Q.P.; Hughes, N. (Taylor & Francis, 2020)This paper investigates the air dense medium fluidized bed (ADMFB) as a suitable dry beneficiation technique to upgrade +5.6 mm-13.2 mm South African coal. The separation efficiency of the ADMFB was assessed by determining ... -
Comparison of physical properties of oxidative sintered pellets produced with UG2 or metallurgicalgrade South African chromite: a case study
Glastonbury, R.I.; Beukes, J.P.; Van Zyl, P.G.; Jordaan, A.; Campbell, Q.P. (SAIMM, 2015)The physical properties of oxidative sintered pellets produced from typical South African UG2 ore are compared with the physical properties of pellets produced with conventional South African metallurgical-grade chromite ore ... -
Contact sorption: a method to reduce the moisture content of coal fines
Van Rensburg, M.J.; Le Roux, M.; Campbell, Q.P.; Peters, E.S. (Taylor & Francis, 2020)This paper introduces contact sorption with ceramic sorbents as a method to reduce the moisture content of coal fines produced by coal processing plants. The proposed method was tested on laboratory scale where ceramic ... -
Drying of coal fines assisted by ceramic sorbents
Van Rensburg, M.J.; Le Roux, M.; Campbell, Q.P. (Springer, 2016)It is proposed to introduce contact sorption drying as a method to reduce the moisture content in coal fines. The aim of this study was to investigate the possibility of drying fine and ultra-fine coal using porous ceramic ... -
Drying of fine coal using air in a fluidized bed
Le Roux, M.; Campbell, Q.P.; Van Rensburg, M.J. (IMPC, 2014)Fluidised bed drying is currently receiving much attention as a dewatering option during the beneficiation of fine (defined here as between 1 mm and 2 mm particles) coal. Apart from concerns about safety and combustion, ... -
Fine coal dewatering using high airflow
Le Roux, M.; Campbell, Q.P.; Van Rensburg, M.J. (Taylor & Francis, 2014)Fluidized bed drying is currently receiving much attention as a dewatering option after the beneficiation of fine coal. Apart from concerns about safety and combustion, the operating costs can be high if very high gas or ... -
Improved gold recovery by accelerated gravity separation
Waanders, F.B.; Campbell, Q.P. (Gecamin Publishers, 2014)This project was specifically aimed at using increased acceleration separation, as a method to optimize the recovery of gold in an ore body mainly consisting of hematite where the specific gravity of gold is much higher ... -
Investigation of lump coal agglomeration in a non-pressurized reactor
Campbell, Q.P.; Bunt, J.R.; De Waal, F. (Elsevier, 2010)The overall aim of this research was to investigate the agglomeration phenomenon of large coal particles (8 cm3 blocks) of three South African non-swelling coals (based on FSI) under various laboratory conditions. The coals ... -
Large-scale design and testing of an improved fine coal dewatering system
Le Roux, M.; Campbell, Q.P.; Smit, W. (SAIMM, 2012)Fine coal (-500 μm) is notoriously difficult to dewater. It is not uncommon for a dewatered product to have a moisture content as high as 30 per cent after vacuum filtration. This poses several handling and financial ... -
Mineralogical, chemical, and petrographic properties of selected South African power stations’ feed coals and their corresponding density separated fractions using float-sink and reflux classification methods
Rautenbach, R.; Strydom, C.A.; Bunt, J.R.; Matjie, R.H.; Campbell, Q.P. (Taylor & Francis, 2019)Three South African feed coal samples for the combustion process were beneficiated to produce carbon-rich and mineral-rich fractions. The mineralogical, petrographical, and chemical properties of these feed coals and ... -
Moisture adsorption and desorption characteristics of some South African coals
Campbell, Q.P.; Barnardo, M.D.; Bunt, J.R. (SAIMM, 2013)The high final total moisture content of fine coal after mining and processing is one of the major reasons that this resource is not extensively used in subsequent power generation, combustion, or other conversion processes. ... -
Moisture transport during contact sorption drying of coal fines
Van Rensburg, M.J.; Le Roux, M.; Campbell, Q.P.; Peters, E.S. (Taylor & Francis, 2020)Studies have shown that contact sorption drying is a feasible technique to dewater fine (+0.15mm–0.5mm) and ultra-fine (−0.15 mm) coal. The aim of this article is to further investigate the drying mechanism involved. It ... -
The preparation of activated carbon from South African coal
Campbell, Q.P.; Bunt, J.R.; Kasaini, H.; Kruger, D.J. (SAIMM, 2012)Activated carbons used in the precious metals extraction industry are characterized by large internal surface areas and a great affinity for metal ions. The purpose of this research is to prepare activated carbon from ... -
Simulation of washability and liberation information from photographs
Dorland, H.C.; Campbell, Q.P.; Le Roux, M.; McMillan, K.; Dorland, M.I. (Springer, 2016)Imagine that a sample of coal could be crushed unlimited times to the same or different top size; a different washability would be obtained for each crushing experiment. Depending on the size and distribution of the raw ... -
Using visual texture analysis to classify raw coal components
Van Vuuren, Pieter A.; Le Roux, M.; Venter, W.C.; Campbell, Q.P.; Dorland, H.C. (IEEE, 2015)Coal ore isn’t a uniform material. In order to optimize the coal liberation process it is necessary to classify a coal ore sample into its constituent components as quickly and cheaply possible. This paper investigates ... -
Validation of using a modified BET model to predict the moisture adsorption behavior of bituminous coal
Strydom, C.A.; Campbell, Q.P.; Le Roux, M.; Du Preez, S.M. (Taylor & Francis, 2016)A good correlation exists between the amount of moisture adsorbed and the oxygen content of medium-rank B vitrinite-rich and medium-rank C inertinite-rich bituminous coal. Total mass moisture adsorbed per gram of coal ... -
Water-only laboratory coal fractionation using the reflux classifier
Campbell, Q.P.; Le Roux, M.; Smith, I.G.T. (Elsevier, 2015)Due to health and environmental factors involved with standard float-sink analytical methods, a water-only fractionation procedure was investigated. A laboratory scale 105 × 105 mm reflux classifier was built and used to ...