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Influence of additives on the devolatilization product yield of typical South African coals, and effect on tar composition

Bean, N.C.; Bunt, J.R.; Strydom, C.A.; Neomagus, H.W.J.P.; Van Niekerk, D. (SAIMM, 2018)

South African coal is mainly used for electricity generation by means of pulverized fuel combustion and liquid fuels production via indirect gasification technology and Fischer-Tropsch synthesis. In order to expand the ...

Green coal development for application in fixed-bed catalytic gasification

Bunt, J.R.; Marx, S.; Waanders, F.B.; Leokaoke, N.T. (SAIMM, 2018)

A novel ‘green coal’ product formulation has recently been developed and the utilization concept tested at the North-West University coal research laboratories. Hydrothermal liquefaction was used to produce bio-oil ...

Moisture adsorption and desorption characteristics of some South African coals

Campbell, Q.P.; Barnardo, M.D.; Bunt, J.R. (SAIMM, 2013)

The high final total moisture content of fine coal after mining and processing is one of the major reasons that this resource is not extensively used in subsequent power generation, combustion, or other conversion processes. ...

Influence of temperature on the recovery of metal elements from coal ash: FACTSAGE™ simulations

Van Dyk, J.C.; Strydom, C.A.; Bunt, J.R.; Collins, A.C. (International Pittsburgh Coal Conference, 2017)

The effect of carbonaceous reductant selection on chromite pre-reduction

Kleynhans, E.L.J.; Beukes, J.P.; Van Zyl, P.G.; Bunt, J.R.; Venter, M. (Springer, 2017)

Ferrochrome (FeCr) production is an energy-intensive process. Currently, the pelletized chromite pre-reduction process, also referred to as solid-state reduction of chromite, is most likely the FeCr production process ...

SEM image processing as an alternative method to determine chromite pre-reduction

Mohale, G.T.M.; Beukes, J.P.; Kleynhans, E.L.J.; Van Zyl, P.G.; Bunt, J.R.; Tiedt, L.R.; Venter, A.D.; Jordaan, A. (SAIMM, 2017)

The specific energy consumption (SEC) of the pelletized chromite prereduction process is the lowest of all FeCr production processes commercially applied. This process also eliminates the use of chromite ore fines that ...

The preparation of activated carbon from South African coal

Campbell, Q.P.; Bunt, J.R.; Kasaini, H.; Kruger, D.J. (SAIMM, 2012)

Activated carbons used in the precious metals extraction industry are characterized by large internal surface areas and a great affinity for metal ions. The purpose of this research is to prepare activated carbon from ...

An understanding of the porosity of residual coal/char/ash samples from an air-blown packed bed reactor operating on inertinite-rich lump coal

Bunt, J.R.; Waanders, F.B.; Nel, A.; Dreyer, L.; Van Rensburg, P.W.A. (Elsevier, 2012)

The thermal treatment of coal causes a development of internal porosity of the resultant char due to the changes in the coal char pores, i.e. the opening of original closed pores, the formation of new pores, and an ...

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, ...

The effect of the roof and floor geological structures on the mineralogical composition of ash produced from coal at UCG operating temperatures

Van Dyk, J.C.; Uwaoma, R.C.; Strydom, C.A.; Matjie, R.H.; Bunt, J.R. (International Pittsburgh Coal Conference, 2017)

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