Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 139 for “"base metal"”.
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Improving base metal electrowinning
<p>"In zinc electrowinning, Mn oxidizes to form MnO<sub>2</sub> on Pb-Ag anodes, cell walls and pipes. MnO<sub>2</sub> reduces anode corrosion but also leads to short circuits and maintenance issues. MnO<sub>2</sub> is thought to interact with chloride ions and produce oxidized chlorine species. …
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Removal of zinc from a base-metal solution using ion exchange at Rustenburg Base Metal Refiners.
… necessitated an expansion in the Rustenburg Base Metal Refinery (RBMR) to accommodate the associated increase in the production of base metals (Cu, Ni, and Co). RBMR’s name plate capacity increased from 21 000 to 33 000 tonnes of nickel per annum. The expansion project involved various …
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Mathematical modelling of the base metal matte converter
… processes. A fundamental knowledge of the base metals matte smelting and converting processes system is valuable for maintaining a stable and optimum process operation. A mathematical model for the Ni - Cu - PGM matte converting process has been developed based on the assumption that the …
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Base metal and gold mine taxation in six nations
Includes bibliographical references.
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Development of base metal-catalyzed C—H functionalization reactions
… predictable manner. Nature has evolved powerful metalloenzymes based on earth abundant base metals like iron that are capable of selectively cleaving and functionalizing C—H bonds. Cytochrome P450 enzymes contain an iron-heme center that reacts with oxygen and water to form high-valent iron-oxo …
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DEVELOPMENT OF BASE METAL-CATALYZED HYDROGEN TRANSFER AND CROSS-COUPLING REACTIONS
The replacement of noble metals with less toxic and less expensive base metals in catalysis is a research topic of growing importance. The work of this thesis is focused on (i) the use of iron catalysts for reactions involving hydrogen transfer and (ii) the development of nickel-catalysed …
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High solid loading aqueous base metal/ceramic feedstock for injection molding
Increasing volume fraction of metal powder in feedstock provided lower shrinkage. Reduction of the shrinkage results in better dimensional precision. The rheology of the feedstock material plays an important role to allowing larger volume fractions of the metal powder to be incorporated in the …
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Investigating the role of dithiophosphate in the flotation of base metal sulfides
… interest to the Platinum Group Mineral (PGM) and Base Metal Sulphide (BMS) industry. Operationally, SEDTP has proved to be a point of contention as there are conflicting views regarding the role of collector with regard to its behaviour at the air-water and solid-water interface in the flotation …
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Electrorefining of base metal refinery residue copper alloy for platinum group metal recovery
… stream for minor elements from Anglo Platinum’s Base Metal Refinery (BMR) which produces copper nickel and cobalt sulphate. It contains mainly sulphur, iron jarosites, unleached base metals and platinum group metals (PGMs), which makes the treatment of SLC necessary. The SLC is currently …
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Probing Base Metal Coordination Complexes Using Electrospray Ionization Quadrupole Time-of-Flight Mass Spectrometry
… much research has been completed focusing on metal coordination complexes in the liquid phase but very little in terms of the gas phase. The purpose of this research is to further investigate these conditions and learn more about the reactions that can occur using Electrospray Ionization …
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Base metal heap and tank leaching of a platreef flotation concentrate using ammoniacal solutions
… primary treatment method for the recovery of base metal sulphides from a PGM containing concentrate that cannot be extracted economically by conventional milling, smelting and refining methods.
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Paleozoic stratigraphy as an ore control of hydrothermal, base-metal, sulfide deposits in New Mexico
… in thirteen mining districts with hydrothermal base-metal deposits in a 35,300 square mile area or southwest New Mexico.</p> <p>The rocks at the stratigraphic position of the ore-zones are characterized as massive- to thick-bedded with less than 5 percent chert present. The rocks are abundantly …
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Recovery of PGM's from a copper oxidising leach residue : Rustenburg Base Metal Refinery Anglo Platinum
Includes abstract. Includes bibliographical references (leaves 164-167).
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Petrology and geochemistry of precious and base metal mineralization, North Amethyst vein system Mineral County, Colorado
Gold, silver and base metal-rich minerals of the North Amethyst vein occupy fractures in 26 Ma volcanic rocks near the southern margin of the San Luis caldera, at the northern edge of the Creede district, San Juan Mountains, Colorado. The veins contain two associations of mineral assemblages that …
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Geodynamic Evolution of the Aegean Back-arc and its Implication for Associated Precious and Base Metal Mineralization
… back-arc of southeast Greece host a range of base and precious metal deposits. Shallow crustal mineral deposits that formed since the late Miocene to active seafloor hydrothermal systems occur in the footwall and hanging wall of the major detachment systems and within all tectono-stratigraphic …
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Gold and Base Metal Mineralization, Hydrothermal Alteration and Vein Paragenesis in the Spring Valley Deposit, Pershing County, Nevada
Spring Valley is a gold-base metal deposit located on the eastern flank of the Humboldt Range in Pershing County, Nevada. Mineralization is primarily hosted within the Feldspar Porphyry, Agglomerate, Welded Tuff, Volcaniclastic Siltstone and Quartz-eye Rhyolite units of the Rochester Formation and …
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Strain Controlled Fatigue Behavior of Weld Metal and Heat-Affected Base Metal in A36 and A514 Steel Welds
Made available in DSpace on 2014-12-14T16:00:31Z (GMT). No. of bitstreams: 1 7709028.pdf: 4372098 bytes, checksum: 8dbff2924188e3f0bef3bc08a79734ac (MD5) Previous issue date: 1976
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The use of life cycle assessment in the evaluation of environmental performance in the base metal refining industry
… by means of a case study carried out at the base metal refinery of impala Platinum Limited. An assessment was first carried out on the historic performance of the process. This was then extended to evaluate some possible impacts of future changes in operating practice and technology.
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