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Browsing Doctoral Degrees (Process Engineering) by Title

Browsing Doctoral Degrees (Process Engineering) by Title

Now showing items 17-36 of 47

A fundamental evaluation of the atmospheric pre-leaching section of the nickel-copper matte treatment process

Lamya, Rodrick Mulenga (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 ...
The fundamental limits of recycling : from minerals processing to computer aided design of automobiles and other consumer goods

Reuter, Markus Andreas (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 ...
A fundamental study of the dissolution of gold from refractory ores

Lorenzen, Leon (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 ...
A generic, semi-empirical approach to the stochastic modelling of bath-type pyrometallurgical reactors

Eksteen, Jacobus Johannes Reuter, M. A. Bradshaw, S. M. (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, ...
High temperature phase equilibria in the Fe-Co-Cu-Si system pertinent to slag cleaning

Banda, Wezi (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 ...
The influence of gas and liquid physical properties on entrainment inside a sieve tray column

Uys, Ehbenezer Chris (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 ...
An integrated approach to waste and energy minimization in the wine industry : a knowledge-based decision methodology

Musee, Ndeke (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 ...
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

Vena, Phumla Faith (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 ...
Mass transfer in structured packing

Erasmus, Andre Brink (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 ...
The mathematical modelling of heat transfer and fluid flow in cellular metallic foams

Fourie, Johan George (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 ...
Modified polysaccharide-based particles for strengthening paper

Terblanche, Johannes C (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 ...
Monitoring and diagnosis of process systems using kernel-based learning methods

Jemwa, Gorden Takawadiyi (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 ...
A neurocontrol paradigm for intelligent process control using evolutionary reinforcement learning

Conradie, Alex van Eck (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 ...
Optimising catalyst and membrane performance and performing a fundamental analysis on the dehydrogenation of ethanol and 2-butanol in a catalytic membrane reactor

Keuler, Johan Nico (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 ...
Practical equation of state for non-spherical and asymmetric systems

Du Rand, Marlie (Stellenbosch : University of Stellenbosch, 2004-12)

ENGLISH ABSTRACT: In this study an equation of state has been developed for the specific purpose of representing systems of simple non-polar spherical and chain-like components and their mixtures for practical applications. ...
Process monitoring and fault diagnosis using random forests

Auret, Lidia (Stellenbosch : University of Stellenbosch, 2010-12)

ENGLISH ABSTRACT: Fault diagnosis is an important component of process monitoring, relevant in the greater context of developing safer, cleaner and more cost efficient processes. Data-driven unsupervised (or feature ...
The processing of wax and wax additives with supercritical fluids

Schwarz, Cara Elsbeth (Stellenbosch : University of Stellenbosch, 2005-12)

Waxes have many potential uses but large-scale application is hampered by their virtual insolubility. By grafting the wax with a polyethylene glycol segment to form an alcohol ethoxylate, the solubility of the wax in ...
Project radicalness and maturity : a contingency model for the importance of enablers of technological innovation

Kleingeld, Anton W. (Stellenbosch : University of Stellenbosch, 2003-04)

ENGLISH ABSTRACT: The main proposition of this study is that the notion of a single set of universal success factors (enablers) of innovation is naïve. Rather, the importances of different enablers are contextually based ...
Quantitative yeast physiology and nitrogen metabolism during heterologous protein production

Gorgens, Johann Ferdinand (Stellenbosch : University of Stellenbosch, 2003-04)

ENGLISH ABSTRACT: QUANTITATIVE YEAST PHYSIOLOGY AND NITROGEN METABOLISM DURING HETEROLOGOUS PROTEIN PRODUCTION By Johann F. Görgens The physiology and nitrogen metabolism of the yeast, Saccharomyces cerevisiae, during ...
Reactive absorption kinetics of CO2 in alcoholic solutions of MEA: fundamental knowledge for determining effective interfacial mass transfer area

Du Preez, Louis Jacobus (Stellenbosch : Stellenbosch University, 2014-04)

ENGLISH ABSTRACT: The reactive absorption rate of CO2 into non-aqueous solvents containing the primary amine, mono-ethanolamine (MEA) is recognised as a suitable method for measuring the effective interfacial mass transfer ...