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 11 of 11 for “"Extraction of metals"”.
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The selective separation and extraction of metals using membrane technology
The separation of Co(II), Ni(II) , Fe(II) and Fe(III) has been a problem that has vexed chemists for many years. Separation has been difficult because of the very similar chemical properties of these transition metals that are situated alongside each other in the Periodic Table. The work contained …
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The modelling of equilibrium data for the solvent extraction of metals.
In the design of a solvent extraction plant for metals it is necessary to treat the equilibrium data either graphically or analytically. This enables stagewise calculations to be performed to explore solvent usage and feed conditions and so optimise on the cost of recovery of the metal. The present …
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The kinetics of liquid-liquid extraction of metals in a rotating diffusion cell. A rotating diffusion cell is used to study the rates of extraction of divalent transition metals by di-(2-ethylhexyl)-phosphoric acid and a sulphur analogue. A chemical-diffusion model describes the rate curves.
… cell (RDC) has been used to study the kinetics of extraction of the transition metals cobalt (II), nickel (II), copper (II) and zinc (II) from sulphate solutions into either of two extractants held in n-heptane; di-(2-ethylhexyl) phosphoric acid (D2EHPA) or di-(2- ethylhexyl) dithiophosphoric …
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An initial electrochemical study into the (Bio)Leaching of chalcopyrite
… to conventional pyrometallurgical techniques for extraction of metals from mineral ores. Chalcopyrite is a key copper mineral due to its abundance on earth. However, due to its refractory nature in sulfate leaching systems, a viable hydrometallurgical route for its extraction remains elusive...The …
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The fixation of arsenic wastes
… found widespread use as a component in a variety of formulations designed to control or eliminate a variety of insect and fungicidal pests. Arsenical wastes are also often produced during the extraction of metals such as copper, gold, nickel and tin. Consequently, there are large numbers of sites …
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Investigations of the electrochemical behaviour of room temperature ionic liquids
The existence of Room Temperature Ionic Liquids (RTILs) has been known for a long time, but only recently have they been pulled to the forefront of chemical research. This increase in attention can be attributed to a keen interest in their intrinsic properties for a wide variety of potential …
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Studies on the recovery of useful chemicals from waste and secondary materials
Chapter 1 of the thesis introduces the technique of hydrometal lurgy , and describes its background in relation to pyrometallurgy, the chemital methods used in hydrometallurgy and its application to metal recovery, with particular reference to the recovery of metals as useful compounds. Chapters 2 …
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The effect of an intervention on experienced chemistry teachers' pedagogical content knowledge of environmental sustainability
… proper education and making learners aware of environmental sustainability issues may be an effective way to help citizens deal with sustainability challenges. Teachers, however, have not been sufficiently trained on how to teach with sustainability concerns in mind. The simultaneous …
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Understanding aggregation of solvating extractants in applied separations
Solvent extraction is an efficient and effective method for the industrial-scale recovery and purification of metals from mixed raw materials. Understanding the molecular-scale forces driving extraction remains an area of active research despite over 70 years of experience with industrial-scale …
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Science of single-wall carbon nanotubes: Purification, characterization and chemistry
Characterization of raw nanotube materials produced by different methods is demonstrated. Depending on the production methods, tubes of different diameters can be produced. Purification of single wall carbon nanotubes produced by laser-oven and HiPco process is also discussed. Metal catalyzed …
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Desorption of Non-Exchangeable Radiocesium in soil from Fukushima Prefecture, Japan
… and a tsunami resulting in the meltdown of four of the six reactor cores operating at the plant. As a result, nuclear waste was released from the plant, contaminating the soil in the region. Most of the contamination was sequestered within the few inches of the soil but unluckily the …