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Showing 1 to 20 of 166 for “"PGM"”.
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Fine-grinding Characterisation of PGM Ore Using HIGmill
Historically, mineral processing industries use conventional tumbling mills to carry out milling operations However, the ore bodies that are currently being explored and mined are low-grade complex ores. These ore bodies often require fine grinding to liberate their valuable fine grained minerals. …
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Multinuclear PGM complexes of thiosemicarbazones : synthesis, characterisation and biological activity
A series of mono- and dithiosemicarbazone ligands were prepared by simple Schiff-base condensation reactions between thiosemicarbazides and various substituted salicylaldehydes.
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Patrol plan of motor gunboat (PGM. Allied Class) for infiltration from sea
Patrol plans have been developed for use by Motor Gunboats to counter small scale infiltration by insurgents from the sea. The objective in developing the patrol plans was to determine the optimum deployment of the generally limited number of patrol craft available to developing nations. The patrol …
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Formation of thiocyanate in bioleaching residues and its effect in PGM recovery
… in low grade Platreef 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 …
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Investigation of the surface properties of gangue minerals in PGM bearing ores
The recovery of Platinum Group Minerals (PGM) and associated sulphides by froth flotation from the Bushveld Igneous Complex is complicated by the presence of naturally floatable gangue minerals such as talc. Although talc is present in small quantities it has a disproportionate effect on …
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Mono- and multinuclear PGM complexes containing thiosemicarbazones synthesis, characterization and antiplasmodial evaluation
Four aryl- and ferrocenyl-derived thiosemicarbazone ligands have been synthesized and characterized using NMR, infrared (IR) spectroscopy and mass spectrometry. These ligands were used towards the synthesis of three series of mono- and multinuclear complexes, in which the thiosemicarbazone ligands …
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Low PGM PtCo alloy catalysts for low loading Polymer Electrolyte Membrane Fuel Cells
… operating conditions. To establish an ideal low PGM MEA design, this thesis investigated two commercial PtCo catalysts (PtCoU30 and PtCoT50). Physical and electrochemical characterisation of the PtCo catalysts were investigated and compared to an in-house Pt benchmark (PtH40). The morphology, …
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Ammonia leaching as a pre-treatment for the processing of oxidised PGM ores
… for the treatment of low grade oxidised PGM ores. The exposure of the ore to the atmosphere leads to the 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 …
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Population Frequencies of Phosphoglucomutase (PGM), Adenylate Kinase (AK), and Haptoglobin (Hp) in the Metropolitan Birmingham Area.
Frequently the need to identify or exclude an individual arises in criminal cases. Historically, fingerprinting has been a universally acceptable method of individual identification. Unfortunately, fingerprints are not always found at the crime scene ; therefore, other methods for identification of …
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Investigation of the effect of different frother blends on the flotation of selected PGM bearing ores
Concentrators processing platinum group mineral (PGM) bearing ores use polysaccharide depressants to reduce the recovery of the naturally floatable gangue minerals (mainly silicates) present in the ores. Recent work has shown that high depressant dosage can completely depress the naturally …
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Assessment of the potential carbon footprint of engineered processes for the mineral carbonation of PGM tailings
… investigate the viability of using pyroxene-rich PGM tailings for the sequestration of CO2, with specific emphasis on net carbon neutrality. Promising mineral carbonation processes have been identified on the basis of an extensive literature review, and include the: ammonium salts pH swing, …
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A bottom-up prospective dynamic materials flow assessment for platinum group metals (PGM) global demand forecast
Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.
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The effect of microbial load and water recycling on the flotation performance of a PGM bearing ore
… microbes have on the flotation performance of a PGM bearing ore from the Bushveld IgneousComplex in South Africa. In addition, the effects of xanthate collectors such as Sodium Ethyl Xanthate (SEX) and Sodium Isobutyl Xanthate (SIBX), widely employed in sulphide mineral beneficiation, on …
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An investigation into chemical factors that affect the behaviour of Gangue minerals in the flotation of PGM ores
… processing. Some Platinum Group Mineral (PGM) concentrators report that 2/3 of the gangue collected on the concentrate is by true flotation and only 1/3 by entrainment [Malysiak et ai, 2001]. This also suggests that mechanisms other than entrainment are responsible for this phenomenon. The …
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Application of life cycle assessment in process design: case study on SO₂ abatement technologies in the PGM sector
… life cycle based, particularly in the context of PGMs. Seminal work by Stewart (1999) investigating the environmental life cycle consideration for design-related decision making in the minerals industry has not led to significant adoption. Forbes et al. (2000) analysed metal processing using LCA …
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An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa
… tailings generated from the processing of PGM ores in South Africa have the potential to sequester significant amounts of CO₂ (~14 Mt per annum). In the indirect pH swing method, silicate minerals are initially leached at low pH and then carbonated at high pH. A previous study on these …
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Investigating electrolyte-reagent-mineral interactions in response to water quality challenges in the flotation of a PGM ore
Froth flotation is a physicochemical process that enables the separation of valuable minerals and unwanted gangue minerals contained in an ore. It utilises the differences in surface properties of the minerals to be separated. Among other factors affecting flotation, water is a major factor as it …
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An investigation into the role of DTP as a co-collector in the flotation of a South African PGM ore
… and/or palladium recoveries and grades in a PGM containing ore from South Africa.
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An electrochemical investigation on the mechanisms of interfacial interactions of a xanthate collector on PGM surfaces in the presence of ions
… of interfacial interactions between ions with PGMs and the subsequent adsorption kinetics of a xanthate collector. This study investigated the effects of Ca2+, Mg2+, SO4 2- , S2O3 2- and Na+ ions at increasing ionic strength, on the adsorption of SIBX on synthetic PdS and PdTe2 minerals. The …
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