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Showing 1 to 20 of 20 for “"Sulphide Ores"”.
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The effect of mixing thiol collectors in the flotation of pure sulphide ores
… to increase the flotation performance of several sulphide flotation operations. The increased flotation performance has often been termed synergistic. Synergism is defined as the effect exceeding the pro rata contribution of either constituent in the mixture. This thesis aims to investigate the …
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The use of simple analytical techniques to assess surface oxidation of sulphide ores
… negative impact on the flotation performance of sulphide minerals. This is because severe oxidation makes it more difficult to process low-grade sulphide minerals, which reduces the recovery of valuable minerals during flotation. It may be possible to quantitatively correlate the rate/level of …
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Growth of mixed cultures of moderate thermophiles for commercial heap bioleaching of low-grade copper-sulphide ores
… for processing low grade and recalcitrant copper-sulphide ores which would otherwise be uneconomic to process using conventional methods of mineral extraction such as concentration followed by smelting or autoclaving. Heap bioleaching has lower operating costs compared to other metallurgical …
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Trace element distributions and partitioning trends in hydrothermal base metal sulphide ores comprising sphalerite, galena, chalcopyrite and tetrahedrite-tennantite
… and distributions in hydrothermal base metal sulphide (BMS) ores using samples from a wide variety of ore deposits and conditions of ore formation. The ranges of trace elements that can be incorporated into natural sphalerite, galena, chalcopyrite and tetrahedrite-tennantite are determined, as …
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Process mineralogical characterisation of the Kansanshi copper ore, NW Zambia
… of ore through three separate circuits: sulphide flotation, mixed flotation and oxide leach, followed by solvent extraction and electro-winning. This study revisits the process mineralogy of the ore using modern mineralogy tools, which for such a large and complex deposit cannot but …
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The role of collectors in the flotation of partially oxidised copper ores
… of partially oxidised and oxidised copper sulphide ores were investigated in this study. More specifically, the role of the functional groups of the collectors, their dosages and the effect of collector mixtures and their dosages were investigated. Batch flotation tests were used to assess …
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The solvent extraction of CU (II) from chloride solutions with certain non-chelating nitrogen donor ligands
… obtained by ferric chloride leaching of complex sulphide ores. Results show that separation of copper from iron is dependent on the amount of acid and chloride present in the aqueous phase.
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An investigation into the feasibility of bioleaching copper sulphide ore of Nchanga mine, Chingola, Zambia
… of copper from its low-grade, mixed oxide/sulphide ores in bioheap operations (Watling, 2006). It is claimed bioleaching may be a cheaper alternative to other traditional metal extraction techniques such as smelting and therefore more suitable to treat marginal or low-grade ores where …
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Evaluation of the Redostat™ device for the study of ferrous iron biological oxidation kinetics.
… 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 kinetics. It is believed that more metal values …
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The batch and continuous bacterial leaching kinetics of a refractory gold-bearing pyrite concentrate
… step in the treatment of refractory gold bearing sulphide ores and concentrates, has created the need for kinetic models to adequately describe bacterial leaching reactor performance. This work is a kinetic study of the bacterial leaching of a refractory gold bearing, pyrite concentrate. The study …
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Metallurgical craft composition at Later Iron Age (50BCE-CE50) Hengistbury Head, Dorset, Britain. An analytical-experimental re-investigation of the site with a focus on Iron Age copper smelting practices.
… smelting process utilizing imported copper- iron sulphide ores was carried out at Hengistbury Head in the Later Iron Age. By placing these results within the site's context and the broader technological context of Iron Age metallurgy in Britain and Ireland, it is argued that the metalworkers from …
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Electrical and seismic responses of shallow, volcanogenic, massive sulphide ore deposits
… produced mainly by uneconomic and disseminated sulphide mineralization and host rock features, demonstrating that the magnitude and character of electrical and seismic responses are not reliable indicators of size and economic sulphide content of volcanogenic sulphide ores. SP, soil geochemistry …
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Dielectric Properties of Minerals and Ores and the Application of Microwaves for Assisted Comminution and Ore Sorting
… Dielectric properties were measured on key sulphide and silicate minerals and select ores at various frequencies and temperatures using the cavity perturbation technique. In combination with data from the literature, experimental data were used to ascertain which minerals could be defined as …
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Investigating the effect of water quality on the adsorption of a xanthate collector in the flotation of a sulphide ore
… response of target minerals. In this study, a sulphide copper ore from the Zambian Copperbelt was floated in synthetic plant waters of varying ionic strengths, and with different concentrations of the collector sodium isobutyl xanthate (SIBX). The synthetic plant waters were prepared by adding …
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Investigating the Influence of the Electrochemical Environment on the Flotation of a Mixed Sulphide Mineral System of Bornite and Chalcocite
… in renewable energy and electric vehicles. Sulphide ores are an important source of copper. These ores contain, on average, 2% copper and require extensive processing to extract this as pure copper. Flotation is a critical front-end process used to remove gangue minerals and concentrate the …
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A mathematical model of a high sulphate wastewater, anaerobic treatment system
… activity or from the biological oxidation of sulphide ores (acid mine drainage), cannot be discharged into the environment untreated. Apart from the high sulphate levels, these waters may be very acidic and have high dissolved heavy metal concentrations. One promising treatment technology is …
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Life cycle assessment of the production of xanthate salts and of their application for ARD mitigation
… used as collectors in the mineral processing of sulphide ores. In more recent studies, xanthate has also been used in the environmental desulphurisation flotation of sulphidic mine tailings and coal waste, with a view to mitigating acid rock drainage (ARD) risks through the pre-disposal removal …
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Acid biodesulphurisation of coal discards using a heap leaching approach
… While physical separation can effectively remove sulphides from fine coal waste, it is more challenging for coal discards and waste rock due to their low liberation. This necessitates either costly physical liberation processes followed by separation or removal through chemical reactions. The …
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An investigation into the effect of potential modifiers on the flotation of a copper sulphide ore
… electrochemical in nature in the flotation of sulphide minerals which have semiconducting properties. Electrochemical mechanisms have two valuable implications in flotation, the potential across the mineral/solution interface determines flotation recovery and the anodic oxidation reaction …
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Developing a relationship between ore feed grade and flotation performance
… of processing much more complex, low-grade ores to meet the growing demand of metal production for our technologically driven future. A fundamental understanding of mineral processing is therefore critical for the optimisation of valuable mineral recoveries from such ores. The mineralogy of …