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Theses and Dissertations (Materials Science and Metallurgical Engineering): Recent submissions
Now showing items 61-80 of 163
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(University of Pretoria, 2015)The effect of thermomechanical controlled processing (TMCP) parameters and chemistry on the grain growth constants n, Q and A in the grain growth equation was studied on microalloyed steels with varying compositions of Nb, ...
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(University of Pretoria, 2015)In this study, a collector combination between xanthate and a fatty acid collector (Betacol 364) is tested on an ore containing chalcopyrite, pentlandite and pyrrhotite. An increase in the rate of pentlandite and pyrrhotite ...
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(University of Pretoria, 2015)Anglo American Kumba Iron Ore, a member of the Anglo American plc group, owns high-quality resource bases in both South Africa and Brazil. One of these, Sishen iron ore mine, is a South African mine, where lumpy high-grade ...
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(University of Pretoria, 2015)Successful commercial electrowinning and refining of metals typically requires the optimization of the electrolyte composition and operating parameters to produce high quality compact electroplated metal. The prediction ...
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(University of Pretoria, 2015)Chemical vapor deposited (CVD) silicon carbide (SiC) is used as a pressure vessel material for tristructural isotropic (TRISO) coated fuel particles for the high temperature pebble-bed reactor. Experience has shown that ...
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(University of Pretoria, 2013)Stress-corrosion cracking of steel occurs in the CO-C02-H20 system when these three environmental components are present together. The dissolved carbon monoxide in the water forms an inhibitive layer on the surface of ...
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(University of Pretoria, 2014)The aim of the study presented here was to investigate the potential for chemical wear of carbon-based refractory materials in a silicomanganese furnace tap-hole. In the study, three research questions were addressed: 1. ...
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(University of Pretoria, 2015)The tapping of slag and metal is a key operational aspect in high-carbon ferromanganese (HCFeMn) and silicomanganese (SiMn) production. Tapping behaviour can be influenced by taphole design and the physicochemical properties ...
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(University of Pretoria, 2014)Although the austenitic stainless steels 304 and 321 are often treated nominally as equivalents in their hot rolling characteristics, the question remains whether any subtle differences between the two allow further ...
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(University of Pretoria, 2014)The use of artificial intelligence models could enhance the process by which decisions are made for trading in the financial markets. In this project the aim was to define, create, apply and analyse the results of an ...
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(University of Pretoria, 2014)Kimberlite is the host rock from which diamonds are mined. The mineralogical features for kimberlites vary greatly with country, origin, depth and type of kimberlite. Kimberlites can contain various clay species with ...
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(University of Pretoria, 1991)A plug-type oxygen probe containing a magnesia stabilized solid zirconia electrolyte rod, was developed. This oxygen sensor was evaluated in the Fe-Cr-0 system at 1873 K by determining the Raoultian chromium and Henrian ...
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(University of Pretoria, 1998)The repair welding of main steam pipelines, which involves the welding of new material onto service-exposed material, are investigated. This paper investigates the literature and experimental work surrounding this subject. ...
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(University of Pretoria, 2014)The leach solution obtained by leaching of zinc containing ores typically has to be highly purified before it can be used as electrolyte for the electrowinning of zinc. Cobalt is a troublesome impurity in the sense that ...
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(University of Pretoria, 2013)Global warming and air pollution are the major problems facing the world today. Therefore strict environmental legislation on the emission of harmful gases from motor vehicles has forced the automobile industry to search ...
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(University of Pretoria, 2013)Direct Reduced Iron (DRI) is used as an alternative feedstock in electric arc furnaces, making up 50% or more of the total iron charge. DRI produced with coal based reductants (for example in rotary kilns) make up roughly ...
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(University of Pretoria, 2013)The purpose of this work was to recover uranium from residue originating from the production of molybdenum -99. Carbonate solutions containing hydrogen peroxide or oxygen gas as oxidants were used as leachants. Experimental ...
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(University of Pretoria, 1983)A sequence of 3250 m of the Rustenburg Layered Suite and its associated mineralization south of Potgietersrus was investigated. Four episodes of faulting have deformed the area. This resulted in very early differentiates, not ...
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The Efficiency of the burn-leach method in assessing the integrity of TRISO coated particle layers (University of Pretoria, 2013)The basic fuel unit of the High Temperature Reactor (HTR) of the Pebble Bed Modular Reactor (PBMR) is a uranium dioxide kernel coated with a buffer layer, an inner pyrolytic carbon (IPyC) layer, a silicon carbide (SiC) ...
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(University of Pretoria, 2012)High and medium-pressure roller crushers operate on the principle of inter-particle crushing by crushing material in a packed bed. Although reference in the study is made to high-pressure roller crushers, the work was done ...
Now showing items 61-80 of 163