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.
Results
Showing 1 to 20 of 80 for “"precious metals"”.
-
Recovery of Precious Metals from Secondary Sources
The project aim is to develop recyclable systems based on ionic liquids (ILs) or deep eutectic solvents (DESs), in combination with ligands and/or oxidants, for the recovery of Pd and Pt from catalytic converters and of Au from electronics using non-toxic reagents. The synthesis of dione and …
-
Bulk Metallic Glasses based on Precious Metals
[Restricted]
-
Distribution of precious metals and geochemistry of lateritic ores
… and degrees of development were analyzed for precious metals, platinum, palladium, iridium and gold by radiochemical neutron-activation analysis. In addition, the distribution of major, minor and other trace constituents (iron, silicon, magnesium, nickel, cobalt, chromium, copper, manganese, …
-
Carbon monoxide-driven reductive organic transformations and precious metals recycling
… terms of selectivity toward rhodium versus other precious metals and results in metal recovery in the form of reduced metallic clusters. The method performs best on freshly reduced surfaces and can be promoted by the addition of tertiary amines. Besides CO gas, formic acid can also be used as a …
-
Development of Dithiobiuret-Based Ligands for Coordination and Selective Extraction of Precious Metals
… These elements are part of a group known as the precious metals, named for their highly coveted status and desired for both their lustrous appearance and their growing industrial applications. The combination of desirability and scarcity make the precious metals especially valuable, which directs …
-
Studies on the reactivity of thiophosphate/thiophosphinate and ethyl xanthate with precious metals
Adsorption mechanisms of modified thiol collectors on gold, silver, and gold-silver alloys have been studied and compared with those of ethyl xanthate (EX). The modified thiol collectors include dicresyl monothiophosphate (DCMTP), dialkyl dithiophosphinate (DTPI) and monothiophosphinate (MTPI). In …
-
An investigation of cyanide-based heap leaching for extracting precious metals from Platreef ore
… route for processing platinum group metals (PGMs) from the Platreef ore body. Overall the process includes two stages of leaching. The first stage involves the thermophile bioleaching of the base metal (BM) sulphide minerals and acts as a form of pre-treatment to oxidise sulphur …
-
Application of Fluid Inclusions and Mineral Textures in Exploration for Epithermal Precious Metals Deposits
… characterized in 855 samples from epithermal precious metals deposits along the Veta Madre at Guanajuato, Mexico. Features associated with boiling that have been identified at Guanajuato include colloform texture silica, plumose texture silica, moss texture silica, ghost-sphere texture silica, …
-
'It Takes a Mine to Run a Mine': Financing Colorado's Precious-Metals Mining Industry, 1859-1902
Made available in DSpace on 2014-12-10T23:20:31Z (GMT). No. of bitstreams: 1 7121153.pdf: 16296376 bytes, checksum: f68dcfdbb9f52341c659e6520552604f (MD5) Previous issue date: 1971
-
RECYCLING OF PRECIOUS METALS FROM WASTE PRINTED CIRCUIT BOARDS VIA A COMBINATION OF PYRO AND HYDROMETALLURGICAL PROCESSES
… of e-waste, consisting of a diverse mix of metals, polymers, and ceramics. Recycling PCBs is crucial for managing hazardous waste and recovering valuable materials, as they contain higher concentrations of precious metals than other electronic waste. Hydrometallurgical and pyrometallurgical …
-
Price discovery, market efficiency and temporal dynamic price relationship: an empirical analysis of worldwide precious metals markets
… and spot price, for three of the most important precious metals, namely gold, silver and platinum.When people are concerned about the economy, prudent investors switch their investment into precious metals rather than other asset classes. Precious metals futures, thus, are used by commercial …
-
The curative bloom : an investigation of medicinal botanical imagery incorporating precious metals and enamel as body adornment
This written report supports the creative thesis entitled The Curative Bloom. The historical exploration of the medicinal uses of plant life, along with a technical investigation of casting, forming and enameling processes, cumulates in a creative body of jewelry work focusing on healing herbs and …
-
Development of rapid techniques based on selective dissolution for the determination of the precious metals in geological samples
The development of a rapid analytical technique for the determination of the platinumgroup elements (PGE) and gold in geological samples is described. The technique is based on selective aqua regia acid leach followed by a selective extraction (using diphenylthiourea and 1,2-dichloroethane) to …
-
Sharing the Burden of Reactivity: Synthesis, Characterization, and Reactivity of Phosphino-Alkoxide First-Row Transition Metal Complexes
… pharmaceutical and petrochemical production, use precious metals to perform critical synthetic transformations that rely on bond activation. Due to the scarce nature of these precious metals, alternative approaches to bond activation have been sought. One such alternative approach is the …
-
Separation of precious metal beta from a JSE multivariate model with macroeconomic variables
… that it can be able to separate the beta for the precious metal factor within the model. The process goes via the investigation of macrovariables (with precious metals used as one of the macrovariables) and their effect on market (JSE) returns. A complete analysis and modeling of this relationship …
-
Geochemistry of Tl and selected elements in four Carlin-Type Gold deposits
<p>Four Carlin-type sediment hosted precious metals deposits and a rhyolite hosted precious metals deposit from the western United States have been analyzed for Ag, Au, Ba, Cu, I, K, Li, Mn, Pb, Rb, Sr, Tl, and Zn, and the relationship between Tl, Rb, and Kin mineralized and unmineralized rocks has …
-
USE AND MACRO-MOLECULAR STRUCTURE OF SILICA POLYAMINE COMPOSITES
… was examined through a series of experiments. Precious metals were removed from both prepared and industrial solutions to gain familiarity with the composites and to develop separation procedures. A number of methods were developed to utilize the properties of the silica polyamine composites in …
-
USE AND MACRO-MOLECULAR STRUCTURE OF SILICA POLYAMINE COMPOSITES
… was examined through a series of experiments. Precious metals were removed from both prepared and industrial solutions to gain familiarity with the composites and to develop separation procedures. A number of methods were developed to utilize the properties of the silica polyamine composites in …
-
Hidden Interiors
… consists of containers fabricated from precious metals and adorned with precious and semi-precious materials. The hidden elements within my work are based on my relationships with specific individuals, moments in my life and memories that I cherish.
Page 1 of 4