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 35 for “"Metal recovery"”.
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Bacterial acid phosphatase and its application to waste remediation and metal recovery
… from aqueous flows. In the presence of metal ions the phosphatase produces metal phosphate at the cell surface via the liberation of inorganic phosphate from a phosphate donor (glycerol-2-phosphate). Previous studies using biogenic hydrogen uranyl phosphate (HUP) on Serratia sp. removed …
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Electrorefining of base metal refinery residue copper alloy for platinum group metal recovery
… 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 toll-refined …
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GREEN METHODS BASED ON ECO-FRIENDLY LIXIVIANTS FOR CRITI-CAL METAL RECOVERY FROM TUNGSTEN INDUSTRIAL SCRAPS
… aims to develop new recycling methods for the recovery of critical metals from hard metal (HM) wastes, based on the use of functional and eco-friendly organic ac-ids in a hydro- or solvometallurgical leaching system. The thesis is presented as a collection of research products (3 articles and 1 …
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A study of the current best practice in the Scottish electroplating industry and improved metal recovery technique for waste water streams.
… new technologies is very limited, often perform metal finishing operations. Metals and chemicals are the basis of the finishing industry. Compared to most of the other manufacturing and industrial production processes, metal finishing can typically be characterised as chemically intensive, and it …
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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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Nickel hydroxy-carbonate precipitation in a pellet reactor
… the Netherlands in a research context to heavy metal recovery from stream concentrations varying from 10 to 10 000ppm. The metals include copper, iron, lead, manganese, nickel and zinc. The potential for effluent treatment is broad and covers a range of mining industries metal-containing …
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Evaluation of the Redostat™ device for the study of ferrous iron biological oxidation kinetics.
Heap bioleaching is an established metallurgical route for the recovery of copper from low grade sulphide ores and pretreatment of refractory gold bearing sulphides. However, metal recovery is generally low (80 to 85% copper recovery is achieved in about a year) due to the slow heap bioleaching …
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Sulfidation of Ternary Oxides: A Thermodynamic and Experimental Study Toward Selective Metal Extraction
Conventional metal refining techniques face growing challenges due to increasing ore complexity and their limited ability to accommodate post-consumer recycling feedstocks. Sulfidation is a promising pyrometallurgical approach for the selective separation and recovery of critical elements from such …
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Critical Material Recovery from Salt-Lakes and Spent Batteries with Membranes and Solvents
The sustainable extraction and recovery of critical metals such as lithium, cobalt, and rare earth elements are essential for advancing renewable energy technologies, electric vehicles, and modern electronics. This thesis addresses the significant environmental, economic, and logistical challenges …
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Studies on the recovery of useful chemicals from waste and secondary materials
… 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 and 3 …
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Precipitation of nickel and cobalt sulphides using different reactor configurations
… dissolved nickel and cobalt. Removal of these metals to optimum levels is desired, however, the product should also be easy to handle and the process easy to incorporate into the current system. There are various precipitation agents that can be used to remove metals from solution, these being …
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Rare Earth Elements (REEs) Recovery and Hydrochar Production from Hyperaccumulators
Phytomining is a promising method for metal recovery, but rare studies have been devoted to metal recovery from hyperaccumulator biomass. The objective of this study was to propose efficient and sustainable methods for treating REE hyperaccumulators, aimed at enhancing REE recovery and obtaining …
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Mathematical modelling of agglomerate scale phenomena in heap bioleaching
… occurring process that has been harnessed in metal recovery from low grade ores. The heap bioleaching technique involves complex interactions between chemical reactions, microbial processes and transport processes. The need for efficient heap operations has led to the scientific investigation …
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Supporting Well-Defined Platinum Group Metals in Metal-Organic Frameworks for Heterogeneous Catalysis
… paramount. The effectiveness of molecular organometallic catalysts in particular can be largely attributed to the precise tools available for synthesis and characterization of the ligands and metal complexes, which allow for fine control over electronics and sterics to optimize substrate binding, …
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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 …
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The application of colloidal photocatalysis in actinide photoredox chemistry
… lattice sites. Photocatalytic treatment of metal ion species by such particles has a number of important commercial applications in precious metal recovery and in the removal of heavy elements from effluent streams. The selective manipulation of actinide metal oxidation states plays an …
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The effect of ion accumulation owing to water recycling on flotation performance
… process. Copper and nickel were the target metals, floated as chalcopyrite and pentlandite, respectively. Their recovery and grade under different conditions was used as a measure to quantify whether a threshold ion concentration existed. The key performance indicators used were: (a) water …
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Controlling dark fermentation of agro-industrial waste for valued organic acids production
… polyhydroxyalkanoates (PHA) production n and metal leaching. 1) Polyhydroxyalkanoates are biopolymers synthesized by several microorganisms as carbon and energy reserves in the event of carbon excess and nutrient deficiency. Industrial production of PHA remains constrained by production costs …
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Microrecycling of Batteries and Carbon-Containing Waste for Manufacturing Different Materials
… batteries—such as lithium-ion (Li-ion), nickel-metal hydride (Ni-MH), and alkaline batteries—presents a huge challenge for both environmental sustainability and resource recovery. These spent batteries contain a wealth of valuable metals, including nickel (Ni), cobalt (Co), manganese (Mn), iron …
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