Search Results - "Bunt, J. R"

Trace element behaviour in the Sasol–Lurgi MK IV FBDB gasifier. Part 1 – The volatile elements: Hg, As, Se, Cd and Pb by Bunt, J.R., Waanders, F.B.

“…Coal-fired power and heat production are the largest single source of Hg in the atmosphere, and in March 2005, the US-EPA ruled regarding Hg reduction from…”
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Changes to the organic functional groups of an inertinite rich medium rank bituminous coal during acid treatment processes by Strydom, C.A., Bunt, J.R., Schobert, H.H., Raghoo, M.

“…A South African inertinite rich medium rank bituminous coal was subjected to a series of acid treatment steps using concentrations of HF and HNO 3 ranging…”
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Trace element behaviour in the Sasol-Lurgi fixed-bed dry-bottom gasifier. Part 3 – The non-volatile elements: Ba, Co, Cr, Mn, and V by Bunt, J.R., Waanders, F.B.

“…Coal contains most of the naturally occurring chemical elements in (at least) trace amounts, with specific elements and their concentrations dependent on the…”
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Structural analysis of chars generated from South African inertinite coals in a pipe-reactor combustion unit by Malumbazo, N., Wagner, N.J., Bunt, J.R., Van Niekerk, D., Assumption, H.

“…An inertinite-rich medium rank C bituminous South African coal was utilized to generate chars in a pipe-reactor combustion unit. This unit generates chars at…”
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The impact of particle size and maceral segregation on char formation in a packed bed combustion unit by Malumbazo, N., Wagner, N.J., Bunt, J.R.

“…•The impact of coal particle size reduction was successfully assessed by petrography.•Maceral distribution of the feed coal fractions varied from the ROM…”
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Physical property behaviour of North Dakota lignite in an oxygen/steam blown moving bed gasifier by Mangena, S.J., Bunt, J.R., Waanders, F.B.

“…In this study lignite originating from North Dakota (USA) was thermally treated in an oxygen/steam blown commercial-scale moving bed gasifier operating on lump…”
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Identification of the reaction zones occurring in a commercial-scale Sasol–Lurgi FBDB gasifier by Bunt, J.R., Waanders, F.B.

“…Gasification behaviour is particle dependent, whilst gasifier (reactor) behaviour is an averaging process of individual responses of each particle. It was…”
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Mineralogical behaviour of North Dakota lignite in an oxygen/steam blown moving bed reactor by Mangena, S.J., Bunt, J.R., Waanders, F.B.

“…In this study, lignite from North Dakota (USA) was thermally treated in a commercial-scale oxygen/steam blown moving bed reactor at the Dakota Gasification…”
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An understanding of the behaviour of a number of element phases impacting on a commercial-scale Sasol-Lurgi FBDB gasifier by Bunt, J.R., Waanders, F.B.

“…Chemical properties of coal which impact on gasification performance relate to those processes which do effect a change in chemical constitution, these in turn…”
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Identification of reaction zones in a commercial Sasol-Lurgi fixed bed dry bottom gasifier operating on North Dakota lignite by Mangena, S.J., Bunt, J.R., Waanders, F.B., Baker, G.

“…The Sasol-Lurgi fixed bed dry bottom gasification technology has the biggest market share in the world with 101 gasifiers in operation. To be able to further…”
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Properties and reactivity of two oxidized and unoxidized South African Highveld fine coal rejects and their density-separated fractions by Mphahlele, K, Matjie, R. H., Bunt, J. R., Uwaoma, R.C.

“…Fine coal reject samples (FCRs) derived from the South African (SA) feed-coal preparation are unsuitable for gasification/combustion. In this novel…”
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The catalytic effect of Benfield waste salt on CO2 gasification of a typical South African Highveld coal by Uwaoma, R. C., Strydom, C. A., Bunt, J. R., Okolo, G. N., Matjie, R. H.

“…The possible catalytic effect of a 5% loading by mass of crystallized salt from spent Benfield solution (SBFS) was investigated and compared with the catalytic…”
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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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Destabilization dynamics of clay and acid-free polymers of ferric and magnesium salts in AMD without pH adjustment by Ntwampe, I O, Waanders, F B, Bunt, J R

“…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…”
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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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Trace element behaviour in the Sasol–Lurgi MK IV FBDB gasifier. Part 2 – The semi-volatile elements: Cu, Mo, Ni and Zn by Bunt, J.R., Waanders, F.B.

“…Gasification is a coal conversion process that could be considered to be more amenable with regards to environmental impact factors when compared to…”
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Steam gasification kinetics of biochar at elevated pressures by Schroeder, J., Neomagus, H.W.J.P., Bunt, J.R., Everson, R.C., Uwaoma, R.C.

“…A waste product biomass sample was received and charred to produce the biochar sample. The char reactivity experiments were conducted in a high-pressure fixed…”
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Mineralogical, chemical, and petrographic properties of selected South African power stations' feed coals and their corresponding density separated fractions using float-sink and reflux classification methods by Rautenbach, R., Strydom, C. A., Bunt, J. R., Matjie, R. H., Campbell, Q. P., Van Alphen, C.

“…Three South African feed coal samples for the combustion process were beneficiated to produce carbon-rich and mineral-rich fractions. The mineralogical,…”
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Reactivity of Fe salts in the destabilization of acid mine drainage employing mixing and shaking techniques without pH adjustment by Ntwampe, I.O., Waanders, F.B., Bunt, J.R.

“…Ferric chloride and Fe-sulphates are commonly Fe-salts used in water treatment, and the iron ionizes to form Fe3+ or Fe2+ when reduction occurs. A volume of…”
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Volatile trace element behaviour in the Sasol ® fixed-bed dry-bottom (FBDB)™ gasifier treating coals of different rank by Bunt, J.R., Waanders, F.B.

“…Trace element simulation and validation of model predictions for the elements Hg, As, Se, Cd and Pb have recently been undertaken for the Sasol ® FBDB™…”
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