• Characterisation of wear in natural rubber and polyurethane hydrocyclones used for minerals processing applications 

  Combrink, Simeon (University of Pretoria, 2020-04)

  Slurry wear is a common problem in the minerals processing industry. Hydrocyclones are widely used in wet mineral classification applications and can be notoriously prone to wear. This study investigated wear in hydrocyclones, ...
• Vanadium recovery in the ferrovanadium production process 

  Van der Merwe, Marnu C.J. (University of Pretoria, 2020-08)

  Ferrovanadium can be produced in a DC arc furnace by reducing V2O3 by means of an aluminothermic reaction. Vanadium recovery is decreased by the formation of vanadium oxides within the slag, along with ferrovanadium droplet ...
• Morphological and compositional changes of chromite as it descends in the black top of a platinum group metals smelter 

  Rivera, Oscar; Garbers-Craig, Andrie Mariana (Elsevier, 2023-10)

  Please read abstract in the article.
• Isothermal oxidation kinetics of industrial South African chromite concentrates in air 

  Swanepoel, Stefan; Garbers-Craig, Andrie Mariana (Elsevier, 2023-11)

  The oxidation of chromite pellets prior to smelting in a submerged arc furnace is key to ensuring that maximum benefit can be derived in the subsequent smelting step. Oxidized pellet feed material reduces operating costs ...
• Nano-strand formation in CaF2-SiO2-Al2O3-MgO flux reacted at 1350 °C with Al-Ti-Fe powder : SEM analyses and gas reaction thermochemistry 

  Coetsee, Theresa; De Bruin, Frederik (Elsevier, 2024-03)

  Nano-strands form in fluoride-based slag during submerged arc welding (SAW) due to the re-condensation of gas species formed at high temperatures in the arc cavity. The SAW process is complex due to gas-slag-metal reactions ...
• Comparison of conventional crushing and high-voltage pulsed power technology as techniques for disaggregating different types of spent magnesia-carbon refractory bricks during recycling 

  Garbers-Craig, Andrie Mariana; Naude, Natasia (Elsevier, 2023-12)

  Three different types of spent magnesia-carbon (MgO–C) bricks were chosen to evaluate the liberation of magnesia particles through high-voltage pulsed power technology (HVPPT) and conventional comminution (jaw and cone ...
• Comparative study between coal tar pitch and lower polycyclic aromatic hydrocarbon (PAH) alternative binders for use in taphole clays 

  Cameron, I.J.-P.; Ramjee, Shatish; Garbers-Craig, Andrie Mariana (Elsevier, 2023-12)

  The use of alternative low polycyclic aromatic hydrocarbon (PAH) binders in taphole clays is essential due to health and environmental concerns associated with PAHs. Binders that could potentially substitute for ...
• Prediction of stress-corrosion cracking using electrochemical noise measurements : a case study of carbon steels exposed to H2O-CO-CO2 environment 

  Van der Merwe, Josias Willem; Du Toit, Madeleine; Klenam, Desmond Edem Primus; Bodunrin, M,O. (Elsevier, 2023-02)

  Please read abstract in the article.
• Thermochemical models and data of layered double hydroxides, a review 

  Muire, Hanno; Zietsman, Johannes Hendrik; Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus) (Elsevier, 2023-12)

  Applications and reports of unique properties displayed by layered double hydroxides (LDHs) are steadily increasing. Fundamental insight into LDH synthesis is essential to developing sustainable production processes, and ...
• Aluminium-assisted alloying of carbon steel in submerged arc welding with Al-Cr-Ni unconstrained metal powders : thermodynamic interpretation of gas reactions 

  Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-11-02)

  Unconstrained metal powders of chromium and nickel, in combination with aluminium, were used in the submerged arc welding (SAW) process to simplify weld metal alloying. Unconstrained metal powders refer to non-alloyed ...
• Aluminium-assisted alloying of carbon steel in submerged arc welding : application of Al-Cr-Ti-Cu unconstrained metal powders 

  Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-02-24)

  Al assisted alloying of carbon steel in Submerged Arc Welding (SAW) by Al-Cr-Ti-Cu unconstrained metal powders is applied. A base case without metal powder additions is compared to two metal powder addition schedules, ...
• Chemical interaction of Cr‐Al‐Cu metal powders in aluminum-assisted transfer of chromium in submerged arc welding of carbon steel 

  Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-02-01)

  In submerged arc welding (SAW) of chromium containing steels, the chromium in the weld metal is usually sourced from weld wire. Manufacturing of precise weld wire compositions for alloying of the weld metal is expensive. ...
• Modification of flux oxygen behaviour via Co-Cr-Al unconstrained metal powder additions in submerged arc welding : gas phase thermodynamics and 3D slag SEM evidence 

  Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-11-19)

  Aluminium metal is avoided as main reactant in submerged arc welding (SAW) because it is easily oxidised in this process. Aluminium is an effective de-oxidiser and can be used to prevent Cr and Co loss to the slag by ...
• Geometric acceleration of complex chemical equilibrium calculations —performance in two- to five-component systems 

  Roos, Willem Abraham; Bogaers, Alfred E.J.; Zietsman, Johannes Hendrik (Elsevier, 2023-09)

  Please read abstract in the article.
• Vacuum melting of compressed powders and hot rolling of the as-cast Ti-48Al-2Nb-0.7Cr-0.3Si intermetallic alloy : mechanical properties and microstructural analysis 

  Ellard, John J.M.; Mathabathe, M.N.; Siyasiya, Charles Witness; Bolokang, A.S. (Elsevier, 2023-09)

  The amalgamated effect of hot-rolling, rapid cooling and heat treatment on the grain refinement and the resultant mechanical properties of an intermetallic sheet of nominal composition Ti-48Al-2Nb-0.7Cr-0.3Si was investigated. ...
• The effect of oxygen lancing into a furnace alloy tap-hole : a computational case study for an open-bath furnace 

  Erwee, Markus Wouter; Reynolds, Q.G.; Zietsman, Johannes Hendrik (Springer, 2023-01)

  The opening of a furnace tap-hole with an oxygen lance is a complex phenomenon that is not well understood in a quantitative way. By means of a case study, the effect of lancing on flow in and around the tap-hole area at ...
• Insight into the chemical behaviour of chromium in CaF2-SiO2-Al2O3-MgO flux applied in aluminium-assisted alloying of carbon steel in submerged arc welding 

  Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-10-31)

  Chromium alloying of weld metal is usually accomplished via weld wire. This is done because chromium has a high affinity for oxygen and is therefore not easily transferred across the arc. The formation chromium (VI) is one ...
• In situ modification of CaF2-SiO2-Al2 O3-MgO flux applied in the aluminium-assisted transfer of titanium in the submerged arc welding of carbon steel : process mineralogy and thermochemical analysis 

  Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-05-11)

  Flux formulations are specified to target chemical and physico-chemical parameters. Chemical parameters set flux element transfer behaviours and weld metal oxygen contents. Physicochemical parameters such as slag viscosity, ...
• Re-austenitisation of thin ferrite films in C-Mn steels during thermal rebound at continuously cast slab corner surfaces 

  Maubane, Dannis Rorisang Nkarapa; Mostert, R.J. (Roelf); Banks, K.M. (Kevin) (MDPI, 2022-12-15)

  The influence of primary cooling and rebound temperature at C–Mn slab corner surfaces during continuous casting on ferrite film transformation and AlN precipitation was investigated. Laboratory simulations included primary ...
• Failure analysis of thin cast A357-T6 centre shell induced by casting defect 

  Annan, Kofi Ahomkah; Nkhoma, Richard; Siyasiya, Charles Witness; Mostert, R.J. (Roelf) (Elsevier, 2022)

  Thin-walled Al-Si alloy precision casting components are used for various applications due to their excellent castability, corrosion resistance as well as high strength to weight ratio. It is very difficult to achieve all ...

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