A5061497226- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Geochemistry and Elemental Analysis
- Mineral Processing and Grinding
- Metal Extraction and Bioleaching
- Advanced X-ray and CT Imaging
- Paleontology and Stratigraphy of Fossils
- Extraction and Separation Processes
- Mining Techniques and Economics
- Recycling and Waste Management Techniques
- Mineralogy and Gemology Studies
- Advanced X-ray Imaging Techniques
- Medical Imaging Techniques and Applications
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Particle Dynamics in Fluid Flows
- Radioactive element chemistry and processing
- Cyclone Separators and Fluid Dynamics
- earthquake and tectonic studies
- Mercury impact and mitigation studies
- Geological Modeling and Analysis
- Astro and Planetary Science
- Iron and Steelmaking Processes
- Heavy metals in environment
- Nuclear materials and radiation effects
Helmholtz Institute Freiberg for Resource Technology
2023-2025
Helmholtz-Zentrum Dresden-Rossendorf
2021-2025
University of Johannesburg
2010-2024
National Research Foundation
2024
Laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS) trace element maps of pyrite and gold from the Carbon Leader Reef in Witwatersrand basin provide new evidence that a significant proportion was intrabasinal, derived West Rand Group or equivalent shales stratigraphically below this reef. Rounded detrital grains vary compact to porous sooty, with similar textures composition diagenetic pyrites reported sedimentary rocks Group. Detrital sooty contain 0.4 11.3 ppm...
Printed circuit boards represent an extraordinarily challenging fraction for the recycling of waste electric and electronic equipment. Due to closely interlinked structure composing materials, selective copper associated precious metals from this composite material is compromised by losses during mechanical pre-processing. This problem could partially be overcome a better understanding influence particle size shape on recovery finely comminuted well-liberated metal particles separation....
The increasing demand for lithium-ion batteries (LIBs) and the critical need lithium make efficient recycling of secondary resources essential. Synthetic Li-bearing phases, some with contents greater than natural sources (e.g., spodumene), can occur in slags produced by pyrometallurgical end-of-life LIBs. This study investigates both composition synthetic model reproducing LIB recovery potential phases using SEM-based automated mineralogy batch flotation tests, respectively. In particular,...
Research Article| September 01, 2010 PALEOENVIRONMENTAL CONTROLS ON THE TEXTURE AND CHEMICAL COMPOSITION OF PYRITE FROM NON-CONGLOMERATIC SEDIMENTARY ROCKS MESOARCHEAN WITWATERSRAND SUPERGROUP, SOUTH AFRICA B.M. GUY; GUY Paleoproterozoic Mineralization Group, Department of Geology, University Johannesburg, Auckland Park, 2006, South Africa, e-mail: bradguy5@gmail.com; nbeukes@uj.ac.za Search for other works by this author on: GSW Google Scholar N.J. BEUKES; BEUKES J. GUTZMER Mineralogy,...
Given the criticality of indium (In) in high-tech applications, spent LCD screens can represent a viable secondary In resource. this work, an innovative and alternative technology to selectively leach from using microbial chelating agent, desferrioxamine E (DFOE), was developed. Indium concentrated by implementing adapted pre-treatment procedure, allowing isolation indium-rich glassy fraction. During leaching, competition between aluminum (Al) for complexation with DFOE leads precipitation...
Abstract The formation of accretion layers within the waste heat boiler is a serious operational concern as it can potentially increase downtime and, hence, limit continuous production. In previous Computational Fluid Dynamics studies, was predicted for an industrial-scale boiler, using dust stickiness sub-routine model. this study, sampling campaign used to validate sub-routine. Furthermore, various sticking and reaction mechanisms flue were investigated compared thermodynamic predictions....
Research Article| December 01, 2015 A Geometallurgical Characterization of the Vaal Reef A-Facies at Moab Khotsong Mine, Klerksdorp Goldfield, South Africa D. Pienaar; Pienaar Geosciences Department, mine, AngloGold Ashanti, Private Bag X 5010, River, 2621, Africa, Department Geology, University Johannesburg, P.O. Box 524, Auckland Park, 2006, email: dpienaar@anglogoldashanti.com Search for other works by this author on: GSW Google Scholar B.M. Guy; Guy SGS Mineral Services, 58 Mellville...
Abstract Copper-sulfides within carbonatites and phoscorites of the Phalaborwa Igneous Complex, South Africa, have been investigated since middle 20 th Century. However, aspects ore formation remained unclear. This study examines mechanisms involved in Cu-sulfide mineralisation by micro-focus X-ray computed tomography as applied to sulfide-rich drill core samples. Several texturally distinct assemblages magmatic sulfides can be identified, including: (1) <500 μm rounded bornite...
Abstract The Mesoarchaean West Rand Group displays a layer-cake stratigraphy with lithostratigraphic units correlatable on basin-wide scale. ~5 km-thick succession consists of fluvial braidplain and shelf deposits, which range from shallow inner marine orthoquartzites, outer argillites to starved iron-formations. Minor diamictites are debris flow origin possibly related glacial activity. Three major sequences present: Sequence I (Hospital Hill Subgroup) is bounded by an angular unconformity...
The demand for lithium, as well other critical resources, needed electrochemical energy storage is expected to grow significantly in the future. Slags obtained from pyrometallurgical recycling represent a promising resource of valuable materials, among them lithium and rare earth elements found artificial minerals particulate phases. This study investigates flotation separation engineered (EnAMs) slags, such aluminate gehlenite gangue phases, respectively. Flotation experiments are carried...
Abstract The recovery of uranium from quartz-pebble conglomerates the Witwatersrand Basin is accomplished through sulphuric acid dissolution under oxidising conditions. At Cooke Section on West Rand Goldfield, extraction process has been plagued by low to moderate yields order 40 75%, as opposed a target 80%. This ascribed high abundance brannerite in ore, which traditionally more problematic leach. In addition brannerite, poor metallurgical recoveries may also be associated with processing...
Abstract Mineralogical and textural variability of ores from different sources commonly leads to processing inefficiencies, particularly when a plant is designed treat ore single source (i.e. relatively uniform composition). The bulk the Witwatersrand in Klerksdorp goldfield, processed at AngloGold Ashanti Great Noligwa treatment plant, derived Vaal Reef (>90%), with comparatively small contribution obtained Crystalkop (or C-Reef). Despite uneven contribution, it critical importance...
&lt;p&gt;Image-based analytical tools in geosciences are indispensable for the characterization of minerals, but most them limited to surface a polished plane sample and lack 3D information. X-ray micro computed tomography (micro CT) provides missing information microstructures inside samples. However, major drawback CT minerals is chemical that makes mineral classification challenging.&lt;/p&gt;&lt;p&gt;Spectral (Sp-CT) new evolving tool different applications such...