Browsing Faculty of Engineering by Author "10192247 - Campbell, Quentin Peter"

Now showing items 1-20 of 32

    • Adsorption of metal ions from fine coal tailings dump waste water using bio-char 

      Fosso-Kankeu, Elvis; Weideman, Reinhardt; Moyakhe, Dumisane; Campbell, Quentin; Waanders, Frans (EARET, 2018)
      Coal mining operations produce large amounts of tailings which contains heavy metals. Heavy metals such as cadmium (Cd) can cause environmental problems. The adsorption capacities of biochars produced from spent coffee ...

    • 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 ...

    • An analysis of the slow compression breakage of coal using microfocus X-ray computed tomography 

      Viljoen, Jacob; Campbell, Quentin Peter; Le Roux, Marco; De Beer, Frikkie (Taylor & Francis, 2015)
      The degradation of coal and the production of coal fines during handling and transport is a serious problem in processes that depend on closely sized large particles. To minimize the production of fines, a fundamental ...

    • 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 ...

    • Characterization of rare earth elements by XRT sorting products of a South African coal seam 

      Akdogan, G.; Campbell, Q.; Bradshaw, S.; Dorfling, C.; Bergmann, C. (Taylor & Francis, 2019)
      South Africa is an important participant in the global coal market. The four Upper coal seam situated in Springs-Witbank Coalfield was subjected to XRT sorting and subsequent mineralogical studies to characterize REE ...

    • Coal product moisture control using stockpiles 

      Campbell, Quentin; Le Roux, Marco; Espag, Chané (Springer, 2016)
      The moisture content of product coal is a major factor influencing the efficiency of downstream coal utilization processes. Product stockpiles are often used as a control measure to regulate the moisture content of the ...

    • Column leaching of fine coal tailings: impact on environment and thickener operation 

      Moyakhe, Dumisane; Fosso-Kankeu, Elvis; Campbell, Quentin (EARET, 2018)
      The coal mining sector is synonymous with generating large quantities of waste. A comprehensive fraction of the waste is classified as fines (-500 µm) and ultrafine (-100 µm) particles, which accounts eleven per cent ...

    • 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 ...

    • Destoning of fine coal in a fluidized bed 

      Le Roux, Marco; Campbell, Quentin; Langner, Danie (Springer, 2016)
      Water scarcity is driving the development of dry coal beneficiation processes. A lot of research has gone into the development of dry dense medium fluidized bed technology (DMFB), especially in China. However, these processes ...

    • 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, ...

    • Effect of fine coal tailing porosity on the mobility and speciation of heavy metals in the leachates 

      Fosso-Kankeu, Elvis; Olivier, Charl; Moyakhe, Dumisane; Barlow, Brad; Campbell, Quentin; Waanders, Frans (EARET, 2018)
      The effect of porosity of coal tailings on the mobilization and speciation of heavy metals is important for the implementation of management strategies. In this study, column leaching experiments were carried out to ...

    • The effect of particle size on the rate and depth of moisture evaporation from coal stockpiles 

      De Goede, J.; Muller, B.; Campbell, Q.P.; Le Roux, M.; De Klerk, C.B. Espag (SAIMM, 2016)
      Excessive amounts of moisture in product coal can influence the efficiency of downstream utilization processes due to a decreased calorific value and handling problems. Stockpiles can be used to decrease the moisture content ...

    • 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 ...

    • Hydrothermal preparation of biochar from spent coffee grounds, and its application for the removal of cadmium from coal tailings leachate 

      Fosso-Kankeu, E.; Weideman, R.; Moyakhe, D.; Waanders, F.B.; Le Roux, M.; Campbell, Q.P. (SAIMM, 2019)
      Spent coffee grounds were transformed into biochar using a hydrothermal method. Some of the biochar product was pre-treated through surfactant impregnation with sodium dodecyl sulphate (SDS) to enhance its adsorption ...

    • 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 ...

    • The influence of bedding-plane orientation on the degradation characteristics of a South African Waterberg coal 

      Viljoen, Jacob; Campbell, Quentin Peter; Le Roux, Marco; Hoffman, Jakobus Willem (Taylor & Francis, 2016)
      A tomographic study of coal microstructure (coal bedding planes, pre-existing cracks, microlithotype boundaries, and mineral boundaries) was undertaken to explain its influence on coal degradation due to impact. A number ...

    • 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 ...