Browsing Faculty of Engineering by Author "10092390 - Beukes, Johan Paul"
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Aqueous solubility of Cr(VI) compounds in ferrochrome bag filter dust and the implications thereof
Du Preez, S.P.; Beukes, J.P.; Van Dalen, W.P.J.; Van Zyl, P.G.; Loock-Hattingh, M.M. (WRC, 2017)The production of ferrochrome (FeCr) is a reducing process. However, it is impossible to completely exclude oxygen from all of the high-temperature production process steps, which may lead to unintentional formation of ... -
Comparison of physical properties of oxidative sintered pellets produced with UG2 or metallurgicalgrade South African chromite: a case study
Glastonbury, R.I.; Beukes, J.P.; Van Zyl, P.G.; Jordaan, A.; Campbell, Q.P. (SAIMM, 2015)The physical properties of oxidative sintered pellets produced from typical South African UG2 ore are compared with the physical properties of pellets produced with conventional South African metallurgical-grade chromite ore ... -
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 ... -
Damring formation during rotary kiln chromite pre-reduction: effects of pulverized carbonaceous fuel selection and partial pellet melting
Van Staden, Y.; Beukes, J.P.; Van Zyl, P.G.; Kleynhans, E.L.J.; Bunt, J.R. (Springer, 2018)Electricity consumption is the largest cost contributing factor in the production of ferrochrome. Currently the pelletized chromite pre-reduction process (solid-state reduction of chromite) is the process option with the ... -
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 ... -
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 ... -
Electrical resistivity of carbonaceous bed material at high temperature
Surup, Gerrit Ralf; Chaldien, Annah; Beukes, Johan Paul; Pedersen, Tommy Andre; Tangstad, Merete (Springer Verlag, 2020)This study reports the effect of high-temperature treatment on the electrical properties of charcoal, coal, and coke. The electrical resistivity of industrial charcoal samples used as a reducing agent in electric arc ... -
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 ... -
Review of Cr(VI) environmental practices in the chromite mining and smelting industry: relevance to development of the Ring of Fire, Canada
Beukes, J.P.; Du Preez, S.P.; Van Zyl, P.G.; Paktunc, D.; Fabritius, T. (Elsevier, 2017)During stainless steel production, new chromium units are obtained from ferrochrome, a relatively crude alloy produced from chromite ore. Large chromite reserves have recently been discovered in the so-called Ring of Fire, ... -
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 ... -
A systems engineering approach for the deployment of an atmospheric monitoring station
Venter, A.D.; Stoker, P.W.; Fick, J.I.J.; Vakkari, V.; Van Zyl, P.G.; Beukes, J.P.; Laakso, L. (Wiley, 2014)In this paper the importance of a Systems Engineering (SE) approach is reiterated for developing and managing an atmospheric monitoring station. A newly established comprehensive atmospheric monitoring station, the Welgegund ... -
Techno-economic feasibility of a preoxidation process to enhance prereduction of chromite
Kleynhans, E.L.J.; Beukes, J.P.; Van Zyl, P.G.; Fick, J.I.J. (SAIMM, 2017)Ferrochrome (FeCr) is vital for the production of stainless and high-alloy ferritic steels, since it is the only source of new Cr units. FeCr production is an energy-intensive process. The pelletized chromite prereduction ...