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Showing 1 to 20 of 30 for “"QEMSCAN"”.
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The potential of QEMSCAN in predicting coal washability of Mpumalanga coals
… dry the float and discard fractions is lengthy. QEMSCAN has the ability to characterise particle density based on the mineralogical composition of the particle. The objective of this research is to determine if QEMSCAN is a viable alternative to float and sink analysis. Float and sink analysis …
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The nature of pan sediments: A case study on dust supply from the Makgadikgadi pans, Botswana
… from parent substrates. The addition of QEMSCAN analyses performed on 5 airborne and 1 surface sample, identified feldspar and pyroxene, along with quartz in its amorphous state, which was further confirmed through SEM analysis. QEMSCAN evaluated 255 minerals, many of which were below the …
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Investigating the use of sodium metasilicate to improve the flotation performance of altered PGE ores
… evaluation by scanning electron microscopy (QEMSCAN) analysis revealed large quantities of serpentine and talc present within the ore sample used in this study, which led to a poor flotation response, as indicated by batch flotation tests. Using sodium metasilicate improved the recoveries and …
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On the progression of leaching from large particles in heaps
… combination of standard optical microscopy, SEM, QEMSCAN and X-ray CT techniques has been used for the characterization of crack networks and mineral dissemination in the ore particles, which are important characteristics that determine the diffusion of reagents into and out of particles and the …
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An investigation into the complementary capabilities of X-ray computed tomography and hyperspectral imaging of drill core in geometallurgy
… of minerals by scanning electron microscopy (QEMSCAN) and quantitative X-ray diffraction (QXRD) were used as supporting techniques. The results showed HSI scanning on the magmatic Ni-Cu-PGE drill core to be challenging because of pervasive mineral alteration and the nature of the rock types …
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Process mineralogical characterisation of the Kansanshi copper ore, NW Zambia
… entailed optical microscopy, XRF, QXRD, QEMSCAN and EPMA investigations, alongside a series of laboratory scale batch flotation tests of two sulphide ores at two grinds (80% passing 150 μm, 80% passing 212 μm). Copper mineralisation at Kansanshi occurs as both vein-hosted mineralisation, …
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Mineralogical and ion-exchange leaching study of a Rare Earth Element (REE) bearing ion-adsorption clay deposit
… of minerals by scanning electron microscopy (QEMSCAN), inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The geochemical leaching characteristics of the clay mineral were investigated using a sequential …
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Dielectric Properties of Minerals and Ores and the Application of Microwaves for Assisted Comminution and Ore Sorting
… liberation of valuable minerals was obtained via QEMSCAN® (quantitative evaluation of minerals by scanning electron microscopy). Microwave treatment increased mineral liberation from most ores but reduced the competency of only a few ores. Massive sulphide ores could not be treated on the …
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Mineralogy and provenance of the TiO₂ - ilmenite heavy mineral sand deposit of Nataka
… 16 selected drill holes using a combination of QEMSCAN and EPMA revealed that the ilmenite has undergone different stages of alteration, at distinct environment conditions, yielding products spanning from hydrated ilmenite to leucoxene. The alteration dominantly involved groundwater, which was …
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Facies, stratigraphy, and mineralogy of the carbonate marker and D marker units, lower Green River Formation, Uinta Basin, Utah
… analysis, X-ray fluorescence, X-ray diffraction, QEMSCAN analysis, and stable isotopic analysis. Four facies associations were identified that correlated to unique depositional environments within the lake. These include delta, mudflat, shoal complex, and sublittoral deposits. Facies associations …
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Deep Eutectic Solvents for the Leaching of Cobalt from Oxide Ores
… and a Ni(Co) laterite ore. Analysis using XRD, QEMSCAN®, and EPMA shows that a considerable proportion of Co was hosted within high-valent Mn-oxides that require reductive processes in order to be liberated. Given this property, subsequent leaching experiments centred around the use of Type III …
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Investigation of the effect of hydrocarbon spillages and their interaction with alteration minerals on the flotation of UG2 PGE ore
… of minerals by scanning electron microscopy (QEMSCAN) was utilized to characterize the bulk mineralogy as well as PGM. The bulk mineralogy was validated with quantitative X-ray diffraction (QXRD). The last phase on the study involved using sodium metasilicate (1500 g/t) and a degreaser (500 …
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Towards the development of an integrated modelling framework underpinned by mineralogy
… using both chemical assays and mineralogy (QEMSCAN). This formed the input data for the development of an ore specific element to mineral conversion (EMC) recipe that converts chemical assays to mineral grades. The EMC technique has the advantage of being fast, inexpensive and can be used on …
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Characterising the acid mine drainage potential of fine coal wastes
… of minerals by scanning electron spectrometry (QEMSCAN).
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Characterizing the potential environmental risks of South African coal processing wastes
… of minerals by scanning electron microscopy (QEMSCAN) and quantitative x-ray diffraction (QXRD) analysis. In addition, conventional net acid generating (NAG) and acid-base accounting (ABA) static tests were enhanced through extended boil NAG tests to assess the organic acids effect on the NAG …
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Investigating the use of sodium silicate to improve the flotation performance of Platreef and UG2 PGE ores
… of minerals by scanning electron microscopy (QEMSCAN) and qualitative X-ray diffraction (QXRD) were also performed on the Platreef and UG2 feed samples and Platreef concentrates to obtain the PGM characterization and bulk modal mineralogy data. The bulk modal mineralogy data showed that the …
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Testing the Forensic Predictive Geolocation Significance of Human-made Particulates in Urban Surface Soils
… dispersive spectrometers (SEM-EDS) (using a QEMSCAN system) and fluorescence microscopy analyses to determine the number of fibres with a human-made origin in the samples. Furthermore, potential plastic particles were handpicked from 10 samples for fourier-transform infrared …
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Environmental mineralogy of gold recovery from refractory gold-arsenic-bearing Bakyrchik concentrates
… of the Fe-As alloy, has been determined by EPMA, QEMSCAN, X-ray and neutron diffraction. Toxicity and solubility of Fe-As alloy in aqueous solutions have been characterised. High-temperature structural behaviour of Fe-As alloy and Fe$_{2}$As in inert atmosphere has been determined by $\textit{in …
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Ore breakage characterisation of UG2 deposits using the JK RBT
… using Leica EZ4D optical microscope and QEMSCAN 650F to determine their mineral composition and texture. The presence of cracks in chromitite stockpile and cut drill core samples was also explored using a Nikon XTH 225 ST micro-focus X-ray system. RoM ore stockpile and cut drill core …
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The geology, petrography, geochemistry and uranium ore mineralogy of the Namibplaas sheeted leucogranites, Damaran orogen, Namibia
… the more uranium enriched D-type leucogranites. QEMSCAN investigation shows that uranium phases present in the D-type sheeted leucogranites are U-oxides as uraninite, U-Ti-oxides as betafite and Th(U)-silicates as uranothorite. The Namibplaas uranium propect is typically a low grade high tonnage …
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