Browsing Doctoral Degrees (Process Engineering) by Title
Now showing items 23-42 of 62
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A fundamental evaluation of the atmospheric pre-leaching section of the nickel-copper matte treatment process
(Stellenbosch : University of Stellenbosch, 2007-03)Nickel-Copper sulphide ores are the most important Platinum Group Metal bearing ores. The South African deposits are exceptionally rich in the platinum group metals (PGMs) and production of the PGMs is the primary purpose ...
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The fundamental limits of recycling : from minerals processing to computer aided design of automobiles and other consumer goods
(Stellenbosch : Stellenbosch University, 2006-12)My applied engineering research and industrial application work of the past 20 years is presented in this dissertation. It is the conjecture of my work that only if thorough first principles knowledge of the depth of ...
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A fundamental study of the dissolution of gold from refractory ores
(Stellenbosch : Stellenbosch University, 1992-12)ENGLISH ABSTRACT: The dissolution of gold from refractory ores is a complex kinetic problem involving a number of chemical, mass transport and mineralogical factors. In most Witwatersrand ores in South Africa more ...
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A generic, semi-empirical approach to the stochastic modelling of bath-type pyrometallurgical reactors
(Stellenbosch : University of Stellenbosch, 2004-03)ENGLISH ABSTRACT: Bath type furnaces have become an established technology for the intensive smelting, converting and refining of primary and secondary raw materials. Since these furnaces normally have large inventories, ...
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High temperature phase equilibria in the Fe-Co-Cu-Si system pertinent to slag cleaning
(Stellenbosch : University of Stellenbosch, 2006-12)In the smelting of copper waste slags to recover cobalt and copper, the prediction of the metal liquidus temperature and the associated superheat for liquid metal handling for subsequent treatments cannot be done with ...
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The influence of gas and liquid physical properties on entrainment inside a sieve tray column
(Stellenbosch : Stellenbosch University, 2012-12)ENGLISH ABSTRACT: Distillation column design and operation require understanding of both the hydrodynamic and thermodynamic behaviour and limitations. One of the hydrodynamic aspects that negatively influence separation ...
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An integrated approach to waste and energy minimization in the wine industry : a knowledge-based decision methodology
(Stellenbosch : University of Stellenbosch, 2004-12)ENGLISH ABSTRACT: The importance of waste management is growing rapidly for several reasons. These reasons include the escalating cost of wastewater treatment and cleaning chemicals, an emerging trend of onerous regulatory ...
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Integrated optimization of pretreatment conditions for bioethanol production from steam treated triticale straw
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Cultivar/environmental variabilities in the production of triticale straw, and its impact on pretreatment-hydrolysis processes for conversion to bioethanol, were addressed in this study. Twenty triticale ...
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Integration of second generation biofuel production into existing industrial processes for short term commercial implementation
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: Since the production of second-generation biofuel (SGB) from lignocellulosic plant biomass is only economically attractive if driven by government incentives, stakeholders are reluctant to commercialise ...
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Integration of xylan extraction prior to kraft and sodaAQ pulping from South African grown Eucalyptus grandis, giant bamboo and sugarcane bagasse to produce paper pulps, value added biopolymers and fermentable sugars
(Stellenbosch : Stellenbosch University, 2013-03)ENGLISH ABSTRACT: The extraction of hemicelluloses prior to pulping that would have been dissolved in black liquor during pulping process, is an attractive alternative for pulp and paper mills as they, in addition to ...
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Investigation of potential bio-active properties and effects on production performance of aquafeed ingredients derived from fish processing waste by way of enzymatic autolysis
(Stellenbosch : Stellenbosch University, 2014-12)ENGLISH ABSTRACT: This study is part of the continuing global research effort dedicated to finding alternative aquafeed ingredients, which not only replace fish meal and fish oil as sources of essential nutrients in ...
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Investigation of the gas dispersion and mixing characteristics in column flotation using Computational Fluid Dynamics (CFD)
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: In this thesis, Computational Fluid Dynamics (CFD) was applied to study gas dispersion and mixing characteristics of industrial and pilot scale flotation columns. An Eulerian-Eulerian multiphase modelling ...
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Mass transfer in structured packing
(Stellenbosch : University of Stellenbosch, 2004-12)ENGLISH ABSTRACT: Structured packing is a popular column internal for both distillation and absorption unit operations. This is due to the excellent mass transfer characteristics and low pressure drop that it offers ...
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The mathematical modelling of heat transfer and fluid flow in cellular metallic foams
(Stellenbosch : Stellenbosch University, 2000-12)ENGLISH ABSTRACT: A mathematical model is presented which conceptualises fluid flow and heat transfer in cellular metallic foams completely saturated with a fluid in motion. The model consists of a set of elliptic partial ...
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Modified polysaccharide-based particles for strengthening paper
(Stellenbosch : University of Stellenbosch, 2010-12)ENGLISH ABSTRACT: The ongoing trend in papermaking industries is to lower production costs by increasing the low cost filler content in the sheets. However, the disruption of inter-fibre bonding is accompanied by a ...
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Monitoring and diagnosis of process systems using kernel-based learning methods
(Stellenbosch : University of Stellenbosch, 2007-12)ENGLISH ABSTRACT: The development of advanced methods of process monitoring, diagnosis, and control has been identified as a major 21st century challenge in control systems research and application. This is particularly ...
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A neurocontrol paradigm for intelligent process control using evolutionary reinforcement learning
(Stellenbosch : University of Stellenbosch, 2004-12)ENGLISH ABSTRACT: A Neurocontrol Paradigm for Intelligent Process Control using Evolutionary Reinforcement Learning Balancing multiple business and operational objectives within a comprehensive control strategy is a ...
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Nonlinear singular spectrum analysis and its application in multivariate statistical process monitoring
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT: Multivariate statistical process control (MSPC) approaches based on principal component analysis (PCA), partial least squares (PLS) and related extensions are now widely used for process monitoring and ...
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Optimising catalyst and membrane performance and performing a fundamental analysis on the dehydrogenation of ethanol and 2-butanol in a catalytic membrane reactor
(Stellenbosch : University of Stellenbosch, 2000-12)Stricter government regulations and higher energy costs have forced the chemical industry to focus more on environmentally friendly processes and to reduce energy consumption. The main goals of chemical companies are to ...
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The planning and optimisation of a supply chain network under uncertainty
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: This research work addresses the planning and optimisation of supply chains that are subject to conditions of operational uncertainty, i.e. fuzziness, (<, ≤, > or ≥) and stochastic’s (probability), that ...
