Browsing Faculty of Engineering by Author "Schobert, Harold H."
Now showing items 1-6 of 6
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Bio-oil production from sweet sorghum bagasse via liquefaction using alkaline solutions and identification of phenolic products
Sehume, Thabo Z.; Strydom, Christien A.; Bunt, John R.; Schobert, Harold H. (Springer, 2020)The feasibility of converting biomass into bio-oil and the effect of an alkaline treatment during biomass liquefaction was studied. Sweet sorghum bagasse (SSB) was treated with NaOH concentrations of 0.5, 1.0, 3.0 and 6.0 ... -
Comparison of sintering and compressive strength tendencies of a model coal mineral mixture heat-treated in inert and oxidizing atmospheres
Nel, Marika V.; Strydom, Christien A.; Schobert, Harold H.; Beukes, J. Paul; Bunt, John R. (Elsevier, 2011)The chemical interactions responsible for sintering in a coal mineral mixture were investigated in air and in N2. A mineral mixture was made up by mixing kaolin, pyrite, quartz, calcite, hydromagnesite, FeCO3 and anatase ... -
Effect of sodium compounds on the sintering propensity of coal-associated minerals
Nel, Marika V.; Strydom, Christien A.; Schobert, Harold H.; Beukes, J. Paul; Bunt, John R. (Elsevier, 2015)This study focused on the chemistry involved in sintering of coal-associated minerals during combustion and inert conditions. Changes in mechanical strength were recorded with compressive strength measurements. This method ... -
Reducing atmosphere ash fusion temperatures of amixture of coal-associated minerals: the effect of inorganic additives and ashing temperature
Nel, Marika V.; Strydom, Christien A.; Schobert, Harold H.; Beukes, J. Paul; Bunt, John R. (Elsevier, 2014)The influence of the ashing temperature and inorganic additives on the reducing-atmosphere ash fusion temperatures of a mixture of coal-associated minerals was investigated. Different inorganic compounds were added to the ... -
Solvent extraction of a South African bituminous coal using a model biomass-derived phenolic mixture
Sehume, Thabo Z.; Strydom, Christien A.; Bunt, John R.; Schobert, Harold H. (SACI, 2019)A model biomass-derived phenolic mixture was investigated for its solvent ability for extraction of a South African bituminous coal at temperatures of 300–360 °C. A previous study showed that phenol gave the highest ... -
The transient swelling behaviour of large (-20 + 16 mm) South African coal particles during low-temperature devolatilisation
Coetzee, Sansha; Neomagus, Hein W.J.P.; Bunt, John R.; Strydom, Christien A.; Schobert, Harold H. (Elsevier, 2014)In order to predict coal behaviour during certain utilisation processes, and to improve and develop coal conversion technologies, it is important to understand the swelling behaviour and plastic properties of coal. X-ray ...