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 278 for “"LEACH"”.
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Improved heap leach extraction through selective ore placement and targeted leach parameter optimization
Includes bibliographical references (pages 117-126).
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Barrick Gold: Design of the Leach Circuit
… gold from the ground. The project focuses on the leaching of gold, the process which chemically extracts the element from processed ore (after the refractory processes). In this paper, the team will explore the various steps of chemically extracting gold, from mineralogy to refractory processes …
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The microbiology of mining leach liquor regeneration
A method for monitoring the growth of Thiobacillus ferrooxidans independently of iron oxidation was developed. This method involved the analysis of protein using the Cobmassie Blue protein-binding assay. It was found to be free from interference by the inorganic ions present in T. ferrooxidans …
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Evaluation of stacking alternatives in gold heap leach operations
Includes bibliographical references.
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Physical Performance of Geomembranes Used in Heap Leach Pad Applications
… used as part of the liner system in heap leach pads. There is a need to quantify tensile strains in the geomembrane that could affect short-term puncture and long-term performance of the GMB. In this thesis, short-term tensile strains arising from indentations caused from the material …
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A value based approach to leach optimization at Rössing Uranium Limited
… the development and execution of an experimental leach programme and the use of a techno-economic model to determine improved operating set-points for a uraninite/uranophane ore body, for plant-scale implementation, that consistently maximise value delivery. A mineralogical investigation of …
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The cleaning of copper leach solutions by means of calcium carbonate
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Metallurgy, 1926 [first author], and Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrochemical Engineering, 1926 [second author].
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Wealth Effects of the Gramm-Leach-Bliley Act on Financial Services Industry
Gramm-Leach-Bliley Act (GLBA) was signed into law on November 12, 1999. This act is regarded as the most influential deregulation for the U.S. financial services industry in the past one-century. The purpose of this study is to determine and analyze the wealth effects of the GLBA on U.S. and …
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Removal of iron from aluminum chloride leach liquors by ion exchange, The
Includes bibliographical references.
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Vanadium and titanium extraction from titaniferous slag using a roast-leach process
… The V primary production process is the roast-leach process which involves roasting, leaching, precipitation, and calcination of the titanomagnetite. The V and steel co-production process entails the smelting of titanomagnetite in the presence or absence of the fluxes. In the presence of flux …
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Relações filogenéticas na família Balanidae (Leach, 1917) sensu Newman & Ross, 1976 (Crustacea, Cirripedia)
Since the time of its proposal, the Balanidae has suffered many modifications. It has been reduced and rearranged until it attained its current status. However, its monophyly and relationship have not been phylogenetically examined and the relationships of Balanidae to other groups of Balanoidea …
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Interrelationship of hydrology, microbial colonisation and hydrometallurgy in a simulated chalcopyrite heap leach
… ores available for extraction decrease, heap bioleaching is gaining interest as a potential operating alternative to traditional methods of roasting and smelting. The efficiency by which bacteria assist leaching chalcopyrite is governed by their interaction and association to the sulphide mineral …
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An electrochemical and leach study of the oxidative dissolution of chalcopyrite in ammoniacal solutions
… treatment processes especially in atmospheric leaching. Hence, pyrometallurgical processes are traditionally used to treat chalcopyrite concentrates. However, ore grades are falling and concentration processes are becoming increasingly costly, prompting need to revisit hydrometallurgical …
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A simplified model for Anglo Platinum's continuous secondary leach in the base metals' refinery
… 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 develop a tool to verify actual …
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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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The effect of leach concentration on the roasting and leaching on a complex sulfide ore
… of high pressure and high-temperature leaching techniques to separate out zinc and copper from the iron constituents of a calcined sulfide ore. An important variable in this study proved to be the concentration of the leaching reagent -- sulfuric acid. The leaching temperature was …
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An analysis of the use of programmable controllers to control an in situ leach mine wellfield
1 PDF file (vii, 109 pages)
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Mineralogical Characterization of Uranium Ores, Blends and Resulting Leach Residues from Key Lake Pilot Plant, Saskatchewan, Canada
… potential contaminants in uranium ore blends and leach residues (solid wastes generated by the milling of ore) is required to predict long-term controls on these contaminants in tailings porewaters. This study characterized the distribution of the elements of concern (EOCs; As, Mo, Ni, and Se) in …
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