Search Results - "Matjie, R.H."

Extraction of alumina from coal fly ash generated from a selected low rank bituminous South African coal by Matjie, R.H., Bunt, J.R., van Heerden, J.H.P.

“…Vast quantities of coal ash, originating from the steam generation coal-based process have accumulated over the years. Continuous research is conducted to…”
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The selective dissolution of alumina, cobalt and platinum from a calcined spent catalyst using different lixiviants by Matjie, R.H., Scurrell, M.S., Bunt, J.

“…Metal catalysts are widely used in the petrochemical processing industry such as in the Fischer–Tropsch (FT) process to produce hydrocarbons from synthesis gas…”
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Effect of fluxing inorganic element-bearing acetate composite on the distribution of pyrolytic products from Highveld partially oxidized fine-coal reject and its beneficiated residue by Mphahlele, K., Matjie, R.H., Bunt, J.R., Janse van Vuuren, A.

“…•Carboxylate salts decrease tar yield but increase carbon conversion and gas yield.•Understanding mode of occurrence of mineral matter is vital for efficient…”
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The influence of calcium lignosulphonate addition on non-isothermal pyrolysis and gasification of demineralised bituminous coal fines by Uwaoma, R.C., Seheri, M.P., Strydom, C.A., Bunt, J.R., Matjie, R.H.

“…•Coal fines were demineralised using acid de-ashing treatment.•CaLS added to the coal fines and demineralised coal in different proportion showed an increase…”
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The determination of pyrolytic synergies between sewage sludge and low-rank coal by Mphahlele, K., Matjie, R.H., Rutto, H., Fonts, I., Gonzalo, A., Osifo, P.O., Bunt, J.R.

“…In this study, South African sewage sludge (SASS) and turnout North American lignite (NAL) were subjected to analytical pyrolysis and evaluation of synergistic…”
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Chemical composition of glass and crystalline phases in coarse coal gasification ash by Matjie, R.H., Li, Zhongsheng, Ward, Colin R., French, David

“…A procedure has been developed for determining the chemical composition and relative abundance of the amorphous or glassy material, as well as crystalline…”
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Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa by Uwaoma, R. C, Strydom, C. A, Matjie, R. H, Bunt, J. R, Okolo, G. N, Brand, D. J

“…The lighter density (<1.5 g/cm3) fractions produced from two waste coals sampled from the waste coal disposal sites at thermochemical plants situated in South…”
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A metallurgical coke replacement derived from torrefied wood chips pre-treated by wet oxidation by Uwaoma, R.C., Stokes, W.G., Bunt, J.R., Strydom, C.A., Matjie, R.H.

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Production of sodium-based zeolites and a potassium-containing leach liquor by alkaline leaching of South African coal fines ash by Collins, A.C., Strydom, C.A., Matjie, R.H., Bunt, J.R., van Dyk, J.C.

“…South African coal discards derived from feed coal for thermoprocesses pose human health and environmental problems and incur high disposal costs. These issues…”
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Kinetics, thermodynamics, and thermal decomposition characteristics of co-pyrolysis of municipality solid waste residue hydrochar and <1.5 g/cm3 fraction of South African discarded fine coal by Uwaoma, R.C., Schröer, B.J., Strydom, C.A., Bunt, J.R., Matjie, R.H., Mphahlele, K., Meyer, J.A.

“…The solid residues obtained after subjecting Municipality Solid Waste Residue (MSWR) to hydrothermal treatment were blended (50:50) with the <1.5 g/cm3…”
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Co-gasification reactivity and kinetics of municipality and coffee waste residue hydrochar and South African density separated coal blends by Uwaoma, R.C., Strydom, C.A., Bunt, J.R., Matjie, R.H., Okolo, G.N., Marx, S.

“…Residues obtained from hydrothermal liquefaction of municipality waste (MSWR) and coffee waste (CR) were blended with coal and charred at 1000 °C…”
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Characterization of unburned carbon present in coarse gasification ash by Wagner, N.J., Matjie, R.H., Slaghuis, J.H., van Heerden, J.H.P.

“…Depending on the mode of operation and quality of the feed material, discrete unburned carbon particles are evident in coarse gasification ash emanating from a…”
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Production of Al(HI)-K(I)-Ti(IV)-sulphate-containing leach liquor from metakaolinite-containing ash derived from South African coal fines by Collins, A.C., Strydom, C.A., Matjie, R.H., Bunt, J.R., van Dyk, J.C.

“…South African discard coal fines and K2CO3 blends were heated in a laboratory-scale rotary kiln to produce ashes for H2SO4 leaching tests. The optimized H2SO4…”
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The influence of the roof and floor geological structures on the ash composition produced from coal at UCG temperatures by Uwaoma, R.C., Strydom, C.A., Matjie, R.H., Bunt, J.R., van Dyk, J.C

“…The mineralogy of the ash and slag formed at typical UCG temperatures were investigated using a bituminous coal from the Theunissen UCG site in the Free State…”
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Mineralogical features of size and density fractions in Sasol coal gasification ash, South Africa and potential by-products by Matjie, R.H., Van Alphen, C.

“…Bulk gasification ash (a mixture of coarse and fine ash particles), a by-product of coal gasification, is formed at elevated temperatures and pressures by the…”
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Chemical and mineralogical characterization of a South African bituminous coal and its ash, and effect on pH of ash transport water by Moitsheki, L.J., Matjie, R.H., Baran, A., Mooketsi, O.I., Schobert, H.H.

“…Sasol utilizes a low-rank bituminous coal for steam and synthetic gas production. The ash produced is transported by water for further processing…”
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Selective removal of dissolved silicon and aluminium ions from gas liquor by hydrometallurgical methods by Matjie, R.H., Engelbrecht, R.

“…Sasol raw gas liquor emanating from the gasification plant is contaminated by trace amounts of silicon, iron and aluminium which can crystallize or precipitate…”
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Mineralogical characterisation of Secunda gasifier feedstock and coarse ash by Matjie, R.H., van Alphen, C., Pistorius, P.C.

“…The formation of clinkers in a Sasol–Lurgi fixed bed dry bottom (FBDB) gasifier is a complex process controlled by coal mineralogy and operating conditions…”
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Extraction of cobalt(II) from an ammonium nitrate-containing leach liquor by an ammonium salt of di(2-ethylhexyl)phosphoric acid by Matjie, R.H., Mdleleni, M.M., Scurrell, M.S.

“…A hydrometallurgical process that involves solvent extraction and selective precipitation has been used to selectively recover Co 2+ from an aqueous filtrate…”
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