Browsing by Author "Waanders, F.B."
Now showing items 1-20 of 60
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Behaviour of calcium-containing minerals in the mechanism towards in situ CO2 capture during gasification
Van Dyk, J.C.; Waanders, F.B.; Hack, K. (Elsevier, 2008)Mineral matter transformation and the behavior of mineral matter in the coal during gasification, provide more information on the suitability of a specific coal source for combustion or gasification purposes. Therefore, ... -
Behaviour of calcium-containing minerals in the mechanism towards in situ CO2 capture during gasification
Van Dyk, J.C.; Waanders, F.B.; Hack, K. (Elsevier, 2008)Mineral matter transformation and the behavior of mineral matter in the coal during gasification, provide more information on the suitability of a specific coal source for combustion or gasification purposes. Therefore, ... -
Behaviour of selected major elements during fixed-bed gasification of South African bituminous coal
Bunt, J.R.; Waanders, F.B.; Schobert, H. (Elsevier, 2012)The Sasol–Lurgi Fixed Bed Dry Bottom gasifier (S–L FBDB) treats a feed coal containing c.a. 30% ash forming minerals, which means that there are complex mineralogical processes occurring simultaneously with each other, ... -
Carbon particle type characterization of the carbon behaviour impacting on a commercial-scale Sasol-Lurgi FBDB gasifier
Bunt, J.R.; Waanders, F.B.; Wagner, N.J. (Elsevier, 2009)Char-form analysis, whilst not yet an ISO standard, is a relatively common characterization method applied to pulverized coal samples used by power utilities globally. Fixed-bed gasification coal feeds differ from pulverized ... -
The characterisation of the corrosion and degradation of atomised ferrosilicon in a dense medium circuit
Mans, Andries (North-West University, 2003)The Kumba Resources Sishen Iron Ore Mine is one of the biggest iron ore producers in South Afica, where beneficiation of the iron ore is done using a dense medium separation process. Ferrosilicon is used as the dense medium ... -
CO2 reactivity of briquettes derived from discard inertinite-rich Highveld coal using lignosulphonate and resin as binders
Leokaoke, N.T.; Bunt, J.R.; Neomagus, H.W.J.P.; Waanders, F.B.; Strydom, C.A. (SAIMM, 2019)South African collieries generate approximately 31 Mt of fine and ultrafine coal annually, with the majority of the ultrafine fraction discarded in slurry ponds and underground workings. Use can be made of this energy ... -
Coagulation/flocculation potential of polyaluminium chloride and bentonite clay tested in the removal of methyl red and crystal violet
Fosso-Kankeu, E.; Webster, A.; Ntwampe, I.O.; Waanders, F.B. (Springer, 2017)This study investigated the influence of the physico-chemical properties of methyl red (MR) and crystal violet (CV) on their removal by bentonite clay and polyaluminium chloride (PACl). Different dosages of bentonite clay, ... -
Coal and coal ash characteristics to understand mineral transformations and slag formation
Van Dyk, J.C.; Waanders, F.B.; Benson, S.A.; Laumb, M.L. (Elsevier, 2009)A knowledge of the composition and structure of minerals in coal is necessary in order to understand the mineral transformations and agglomerate or slag formation during combustion or gasification. Coal ash fusibility ... -
Coal char temperature profile estimation using optical reflectance for a commercial-scale Sasol-Lurgi FBDB gasifier
Bunt, J.R.; Waanders, F.B.; Joubert, J.P. (Elsevier, 2008)In the Sasol-Lurgi fixed-bed dry-bottom (FBDB) gasifier the temperature in the combustion zone should not exceed the melting point of the ash-forming minerals, causing them to melt/flow and agglomerate. Sintering of ash ... -
Colouring of dolomite, quartzite and dolerite mine dump rocks
Easton, Z.; Waanders, F.B.; Fosso-Kankeu, E. (EARET, 2018)For environmental and aesthetic purposes it has become essential that mine dump rocks either blend into the environment or be used in the production of other products. Lately, there has been a constant need to produce ... -
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 ... -
Copolymerization of ethyl acrylate onto guar gum for the adsorption of Mg(II) and Ca(II) ions
Fosso-Kankeu, E.; Waanders, F.B.; Maloy, E. (Taylor & Francis, 2016)In the present study, the copolymerization of ethyl acrylate and guar gum was induced by microwave irradiation in the presence of catalytic amount of the initiator potassium persulfate (KPS). The maximum percentage conversion ... -
Degradation of polycyclic aromatic hydrocarbons from coal tar aqueous solutions using photo-biocatalysts
Batchamen Mougnol, Jean-Bedel (North-West University (South Africa)., 2023)Polycyclic aromatic hydrocarbons (PAHs) are amongst the most predominant pollutants that are currently released into the environment. Despite the myriad of environmental regulations enforced by governments in countries ... -
The design and operational behaviour of a laboratory scale fixed-bed gasifier
Conradie, Frederik Hendrik (North-West University (South Africa) , Potchefstroom Campus, 2016)Fixed bed coal gasification and combustion operations form an important part in the global energy supply, and these processes are characterized by complex interactions which are difficult to study on an industrial scale. ... -
Design of a primary off-gas scrubber for a ferro-manganese electric arc furnace process
Fourie, Jethro Paul (2014)An electric arc furnace makes use of electrical energy in the form of an arc to heat charged material. In the ferromanganese smelting process the ferric oxide (Fe2O3) and manganese oxide (MnO2) are reduced with coke. The ... -
Destabilization dynamics of clay and acid-free polymers of ferric and magnesium salts in AMD without pH adjustment
Ntwampe, I.O.; Waanders, F.B.; Bunt, J.R. (IWA Publishing, 2016)The physicochemical treatment was employed to treat acid mine drainage (AMD) in the removal of turbid materials using clay only (exp A) and a combination of clay, FeCl3 and Mg(OH)2 (exp B) to form a polymer. A 5 g sample ... -
Determination and statistical evaluation of the effect of minerals and mineral associations in specific dense medium fractions on ash fusion temperature
Govender, Ashriti (North-West University, 2005)During Sasol-Lurgi Fixed Bed Dry Bottom coal gasification, the mineral matter in coal undergoes various transformations. Heat induced transformation due to low ash fusion temperatures leads to agglomeration of the ash ... -
Effective removal of ammonia from the drinking water system : a case study at Magalies Water
Mugwili, Muyahavho Enemiah (North-West University (South Africa)., 2023)Access to clean drinking water and sanitation is recognised as a human right and imperative to holistic functioning of life and interlocking nitty-gritties. In recent years, the quality of surface water in low- and ... -
Effluent treatment and its re-use for the Kriel Power Station
Mkabane, Palesa Tolerence (North-West University (South Africa) , Potchefstroom Campus, 2015)Kriel Power Station generates effluent of about 5ml per day from different effluent streams of the pre-treatment plant. Currently the water is recovered into the effluent sump and pumped to the high level ash water sumps ... -
Environmental geochemistry and acid mine drainage modelling of the Sabie River water system in the vicinity of abandoned gold mines
Lusunzi, Rudzani (North-West University (South Africa)., 2023)The purpose of this research was to learn more about the release, transport, dispersal, and fate of metal species emitted by mine tailings storage facilities (MTSFs) on the Sabie River system. Analytical techniques and ...