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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 56 for “"Base metals"”.
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Effect of taxation on the base metals industry in Mexico
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1960.
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Environmental considerations in the design of base metals refineries : metals in riverine systems
… a need for engineers involved in the desing of base metals refineries to understand the impacts of their design on the environment. Desing engineers should move their focus away from meeting effluent release concentration limits to identifying potential environmental impacts.
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A simplified model for Anglo Platinum's continuous secondary leach in the base metals' refinery
An Excel-based mathematical model simulating the Base Metal's Refinery Secondary Leach operation is developed in this thesis. Fundamental building blocks of batch leach data, equipment specifications, process conditions and feed characteristics are used to develop the model. The aim of which is to …
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The recovery of valuable base metals from electronic waste using a biological matrix extracted from Black soldier flies
… waste stream in the world containing valuable metals that exceed those rich in ore from mines. In Africa, e-waste metal recycling remains largely informal and small scale resulting in inefficient metal recovery, increased negative environmental impact and human health hazards. E-waste metal …
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Total Fume and Heavy Metals Emission Factors Applicable to Aluminum-Lithium Alloy Welding
… welding techniques, primarily driven by the base metals, filler rods, electrodes, and environmental factors, welding is a major process used in industry, commerce, and service sectors. The focus of this research is to understand the fumes generated by the Tungsten Inert-Gas (TIG) welding on …
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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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The use of polyurethane foams for the extraction of platinum (II) from hydrochloric acid solutions in the presence of tin (II) chloride
… from solutions containing platinum and certain base metals is examined. Results obtained show that in all cases almost complete extraction of platinum was achieved. Of all the base metals investigated only Cu(II) co-extracts to a small extent with the noble metal. In this work a procedure has …
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Structural and electrical characterisation of silicon and other semiconducting nanoparticle networks for use in sensor and photovoltaic applications
… ore in order to recover PGMs (Platinum Group Metals), by a pure hydrometallurgical route. This method comprised of two stages, an initial thermophile bioleach stage to extract base metals followed by a cyanide leach to recover precious metals, PGMs. The study conducted assessed the possibility …
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Selective preconcentration of platinum and rhodium from hydrochloric acid media containing tin (II) chloride using polyurethane foam
… flame AAS. Near-quantitative recovery of these metals has been achieved by means of foam stripping using a suitable eluent. The rate of formation of the chloro-(trichlorostannato)platinum( II) complex anions is rapid when PtCl₄²⁻ is treated with an excess of tin( II) chloride. On the other hand, …
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Formation of thiocyanate in bioleaching residues and its effect in PGM recovery
… ore in order to recover PGMs (Platinum Group Metals), by a pure hydrometallurgical route. This method comprised of two stages, an initial thermophile bioleach stage to extract base metals followed by a cyanide leach to recover precious metals, PGMs. The study conducted assessed the possibility …
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Delineation of the Cardioprotective Agents found in red wine
… 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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The solvent extraction and separation of the tetrachloroplatinate (2) and -palladate (2) ions in the presence of stannous chloride into methylisobutylketone
… A preliminary study of the effect of four base metals on the separation was undertaken.
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Ammonia leaching as a pre-treatment for the processing of oxidised PGM ores
… formation of an oxidation layer (consisting of base metal oxides) which inhibits the flotation process that requires a clean mineral surface to be effective. Previous studies have shown that an acid pre-treatment could lead to a 20% PGM recovery increase. Due to the corrosive nature of acid, …
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An investigation into the effect of solid particulate phase on the bioleaching performance of Sulfolobus metallicus
… mineral bioleaching may be used to liberate base metals such as copper from refractory sulphidic ores. The microorganisms used in the high intensity tank-based commercial biohydrometallurgy processes are mainly mesophiles, although moderate thermophiles are currently used at Youanmi Mine in …
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The influence of alchemy and Rosicrucianism in William Shakespeare's Pericles, Prince of Tyre and The tempest, and Ben Jonson's The alchemist
… reflected in the laboratory refinement of base metals in fire (lightning) and water (sea). Pericles is able to unite with his refined Soul, incarnated in Thaisa: from their union the Philosopher's Stone or the Spirit, Marina, is born, who transmutes the base metals of men's natures by …
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Corrosion And Wear Resistance Of Titanium- And Aluminum- Based Metal Matrix Composites Fabricated By Direct Metal Laser Deposition
<p>Titanium- and Aluminum-based metal matrix composites (MMC) have shown favorable properties for aerospace applications such as airframes, reinforcement materials and joining elements. In this research, such coatings were developed by direct metal laser deposition with a powder-fed fiber coupled …
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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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Development of base metal-catalyzed C—H functionalization reactions
… 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 intermediates. …
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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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An Analysis of Microstructure and Corrosion Resistance in Underwater Friction Stir Welded 304L Stainless Steel
… metallography. Results were compared to base metal, ambient FSW, and arc welds. Upper and lower sensitization localization bands were identified in the UWFSWs. Although higher sensitization levels were present in UWFSWs compared to the arc weld, ambient FSW, and heat treated base metals, …
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