• FACTSAGE™ thermo-equilibrium simulations of mineral transformations in coal combustion ash 

  Collins, A.C.; Strydom, C.A.; Van Dyk, J.C.; Bunt, J.N. (SAIMM, 2018)

  The aim of this investigation is to report on the influence of operating conditions, and of additives such as potassium carbonate, on the slagging behaviour of South African coal. This was done using a FACTSAGE™ model that ...
• Conceptual use of vortex technologies for syngas purification and separation in UCG applications 

  Brand, J.F.; Van Dyk, J.C.; Waanders, F.B. (SAIMM, 2018)

  Syngas from Africary's Theunissen underground coal gasification (UCG) project will be used for power production and synthesis of liquid fuels and commodity chemicals. However, some of the coal components, especially ...
• Metastability of the boron-vacancy complex in silicon: insights from hybrid functional calculations 

  Ouma, Cecil N.M.; Meyer, Walter E. (De Gruyter, 2018)

  Using four distinct configurations of the boron-vacancy (BV) complex in silicon, we investigate the experimentally observed defect metastability of the BV complex in silicon using the HSE06 hybrid functional within the ...
• Steady-state and transient modelling of a microchannel reactor for coupled ammonia decomposition and oxidation 

  Schumacher, Kevin; Engelbrecht, Nicolaas; Everson, Raymond C.; Bessarabov, Dmitri G.; Friedl, Markus (Elsevier, 2019)

  A computational fluid dynamic (CFD) model was developed to describe the transient and steady-state behavior of NH3 decomposition in an experimental autothermal microchannel reactor. The effects of NH3 decomposition and NH3 ...
• Influence of density separation of selected South African coal fines on the products obtained during liquefaction using tetralin as a solvent 

  Uwaoma, Romanus C.; Strydom, Christien A.; Matjie, Ratale H.; Bunt, John R. (ACS, 2019)

  The liquefaction of two South African discarded coal fines and their density separated (float) fractions were carried out under moderate conditions in a laboratory autoclave. Liquefaction tests were carried out on both ...
• First-principle studies of ferrimagnetic double perovskite Ca2FeMoO6 compound 

  Sebaa, O.; Obodo, K.O.; Zaoui, Y.; Beldi, L.; Bouhafs, B. (Springer, 2019)

  Using first-principle calculations, the structural, electronic, and magnetic properties of the Ca2FeMoO6 double perovskite compound is investigated. Different spin-ordering: ferrimagnetic (FiM), ferromagnetic (FM), and ...
• A methodology to determine best-suited waiting-time periods for turbine start-up under fluctuating resources 

  Venter, P.V.Z. (IEEE, 2019)

  — It is not uncommon for engineering process plants to comprise energy recovery. When power generation takes place under such circumstances, the nature of interlinked processes may result in fluctuating resource availability. ...
• The use of optimisation modelling for energy recovery investment decision making 

  Venter, P.V.Z.; Terblanche, S.E.; Van Eldik, M. (IEEE, 2019)

  Investment decision making is a common occurrence for any engineering company. These investments include any possibility from relative inexpensive to extremely costly equipment. When power generation turbine procurements ...
• Simultaneous removal of pollutants from water using nanoparticles: a shift from single pollutant control to multiple pollutant control 

  Hlongwane, Gloria Ntombenhle; Sekoai, Patrick Thabang; Meyyappan, Meyya; Moothi, Kapil (Elsevier, 2019)

  The steady increase in population, coupled with the rapid utilization of resources and continuous development of industry and agriculture has led to excess amounts of wastewater with changes in its composition, texture, ...
• Instrument transformers influence on harmonic measurements for grid code compliance 

  Murray, Ruan; De Kock, Jan (IEEE, 2019)

  With an increased penetration of renewable energy sources in South Africa, especially photovoltaic (PV) and wind farm generating plants, power quality is becoming more important for utilities. With that also the accuracy ...
• Rapid microwave-assisted liquid phase conversion of bio-ethanol to n-butanol over a heterogeneous catalyst 

  Marx, Sanette; Ndaba, Busiswa (Taylor & Francis, 2018)

  A sustainable bio-based fuel industry is dependent on finding efficient technologies for the production of biofuels. A microwave-assisted method to produce bio-butanol from bio-ethanol in liquid phase was investigated using ...
• 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, 2018)

  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 ...
• Moisture transport during contact sorption drying of coal fines 

  Van Rensburg, M.J.; Le Roux, M.; Campbell, Q.P.; Peters, E.S. (Taylor & Francis, 2018)

  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 ...
• Microwave-assisted recovery of monomeric sugars from an acidic steam treated wood hydrolysate 

  Marx, Sanette; Radebe, Lehlohonono J. (Elsevier, 2018)

  ractionation of components from bio-refinery wastes streams is complicated by the presence of both oligomer and lignin fractions. Microwave-assisted acid hydrolysis was used in this study to convert oligomer sugars in an ...
• Electrical circuit modelling of double layer capacitors for power electronics and energy storage applications: a review 

  Jiya, Immanuel N.; Gouws, Rupert; Gurusinghe, Nicoloy (MDPI, 2018)

  There has been increasing interests in the use of double layer capacitors (DLCs)—most commonly referred to as supercapacitors (SCs), ultra-capacitors (UCs), or hybrid capacitors (HCs)—in the field of power electronics. ...
• Math hydrogen catalytic recombiner: engineering model for dynamic full-scale calculations 

  Avdeenkov, A.V.; Malakhov, A.A.; Bessarabov, D.G.; Sergeev, V.V.; Stepanov, A.V. (Elsevier, 2018)

  To protect a hermetic enclosure and the equipment and systems of a reactor installation housed in it from damage caused by the ignition (explosion) of hydrogen, most nuclear power plants with pressurized water reactors are ...
• Rigid polyurethane foams from unrefined crude glycerol and technical lignins 

  Muller, Louis Christiaan; Marx, Sanette; Vosloo, Hermanus C.M.; Fosso-Kankeu, Elvis; Chiyanzu, Idan (Sage, 2018)

  The need for green materials has driven interest in the preparation of rigid polyurethane foam (PUF) from various biomass types. The present study aims at increasing bio-based content by utilizing by-products from both ...
• Some physical and chemical characteristics of calcium lignosulphonate-bound coal fines 

  Strydom, C.A.; Mthombo, T.S.; Bunt, J.R.; Neomagus, H.W.J.P. (SAIMM, 2018)

  Low-cost calcium lignosulphonate (CL), which is a byproduct of theWOOD pulping industry, was investigated as a potential binder during laboratoryscale pelletization of inertinite-rich high-ash coal fines from the ...
• Nonequilibrium poroelectroelastic theory for polymer electrolytes under conditions of water electrolysis 

  Kalinnikov, A.A.; Bessarabov, D.G.; Grigoriev, S.A. (Elsevier, 2019)

  The paper deals with the nonequilibrium poroelectroelastic theory (PEET) for polymer electrolytes (PE) under the conditions of water electrolysis with a view of further use in the theoretical description of mass transfer ...
• Structural, compositional and mineralogical characterization of carbonatitic copper sulfide: run of mine, concentrate and tailings 

  Nyembwe, Kolela J.; Fosso-Kankeu, Elvis; Waanders, Frans; Nyembwe, Kasongo D. (Springer, 2019)

  The aim of this study was to determine the structural, compositional, and mineralogical composition of carbonatitic copper sulfide concentrator plant streams. Three samples, each from a different stream (run of mine (ROM), ...

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