Browsing by Author "Bruinsma, O.S.L."
Now showing items 1-8 of 8
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The continuous depolymerization of filled polytetrafluoroethylene with a continuous process
Van der Walt, I.J.; Bruinsma, O.S.L.; Grunenburg, A.T.; Nel, J.T.; Maluleke, G.G. (Wiley, 2008)A new method for beneficiating unfilled as well as filled polytetrafluoroethylene (PTFE) waste has been developed. This process does not use any carrier gas while forming the depolymerization products. It enables polymer ... -
Integrated barium carbonate process for sulphate removal from mine wastewater
Hlabela, Patrick Simon (North-West University, 2009)The mining industry in South Africa is one of the primary sources of water pollution. Closed down mines leave a legacy of chemically polluted water after closure, and current operating mines are continuously discharging ... -
A kinetic expression for the pyrolytic decomposition of polyterafluoroethylene
Van der Walt, Izak J.; Neomagus, Hein W.J.P.; Bruinsma, O.S.L.; Nel, Johann T.; Crouse, Philippus L. (Elsevier, 2008)Despite the fact that the thermal decomposition of polytetrafluoroethylene has been extensively studied over the past six decades, some inconsistencies regarding the kinetic parameters, e.g. the order of the reaction, ... -
Recovery of valuable products from polytetrafluoroethylene (PTFE) waste
Van der Walt, Izak Jacobus (North-West University, 2007)The disposal of PTFE waste presents a global problem from both an ecological and economical perspective. This study was performed to address this problem as well as to understand the mechanism according to which PTFE is ... -
Separation of zirconium and hafnium via solvent extraction
Van der Westhuizen, Derik Jacobus (North-West University, 2010)Zirconium metal (Zr) is highly desirable as a cladding material for nuclear fuel rods in nuclear power plants, because of its very low nuclear absorption cross-section for thermal neutrons, however to use this Zr metal it ... -
Separation of Zr and Hf via fractional crystallization of K2Zr(Hf)F6 : a theoretical and experimental study
Branken, David Jacobus (North-West University, 2009)Due to the low absorption cross section for thermal neutrons of zirconium (Zr) in contrast to hafnium (Hf), Zr-metal must essentially be Hf free (<100 ppm Hf) to be suitable for use in nuclear reactors. However, Zr and Hf ... -
Solvent extraction of South African coal using a low volatile, coal-derived solvent
Van Rensburg, Eulouka Janse (North-West University, 2007)Coal is an important fuel for countries with large coal reserves such as South Africa since it is expected that oil and natural gas prices will continue to rise. The Waterberg coalfield contains 40% of South Africa's ... -
Thermal reduction of barium sulphate with carbon monoxide: a thermogravimetric study
Hlabela, S.P.; Neomagus, H.W.J.P.; Waanders, F.B.; Bruinsma, O.S.L. (Elsevier, 2010)The kinetic parameters of the reduction of barium sulphate to barium sulphide using carbon monoxide fractions of 2.4–9.6% and temperatures of 850–1000 °C, using an isothermal thermogravimetric method, were obtained. This ...