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 26 for “"Minerals Processing"”.
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Predictions of leachate generation from minerals processing waste deposits
The minerals processing industry in South Africa produces significant tonnages of waste material which are disposed of commonly in dedicated waste depositories. These deposits pose a potential to pollute the environment if leachate is generated within the deposit and released to the surroundings. …
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Predictions of leachate generation from minerals processing waste deposits
The minerals processing industry in South Africa produces significant tonnages of waste material which are disposed of commonly in dedicated waste depositories. These deposits pose a potential to pollute the environment if leachate is generated within the deposit and released to the surroundings. …
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Solar energy in the minerals processing industry: identifying the first opportunities
… to supply the high energy demand of selected minerals processing industries by co-locating a solar power plant with a minerals processing operation. The effect on how the use of a utility scale solar energy use affects fuel transportation energy and conversion and transmission line losses is …
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Assessment and modelling of chromium release in minerals processing waste deposits
The minerals processing industry is by far the largest generator of mineral solid wastes, which are commonly stored in large scale landfill deposits. The potential environmental impact of these is directly linked to the time-dependent process of leachate generation within these deposits. Rainwater …
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Environmental life cycle considerations for design-related decision making in minerals processing
… decision making in design for the environment in minerals processing. To this end an integrated decision hierarchy has been developed. This decision hierarchy incorporates technical, environmental and social considerations in the design process. Life Cycle Assessment (LCA) has been chosen as the …
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The development and demonstration of a practical methodology for fine particle shape characterisation in minerals processing
… models for the design and optimisation of minerals processing operations are of critical importance. These models do not currently incorporate particle shape, which, although rarely quantified, is known to affect numerous unit operations. Automated Scanning Electron Microscopy …
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Development of an automatic system to monitor the performance of a dense medium (mineral) separation process
… (DMS) is a process used extensively in the minerals processing industry to separate dense from less dense material in a dense fluid. It may be considered to be a simple “sink-float” separation process. DMS is used on a large scale in South African coal, iron ore and diamond operations. There …
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Integrative Approach to Metal Extraction and Electrification
… that produces metals directly from their sulfide minerals. A particular focus of the technology has been on copper metal extraction from chalcopyrite. Molten sulfide electrolysis is competing against established technologies in a legacy industry. The premise behind this work is that molten sulfide …
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An automated camera tracking system for single bubble velocity profiling
… is to be used in research relevant to the minerals processing industry. The software components were developed in Matlab and Microsoft Visual C++ and implemented in Visual C++. The methodology used to develop the apparatus is presented, and typical examples of velocity profiles are given. …
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A mathematical model for predicting classification performance in wet fine screens
… is a well-known classification process in the minerals processing industry. The process involves separation of fine particles from coarse particles based on size and is applicable to both dry and fine screening. Fine screening is normally carried out wet. Until recently, fine wet screening had …
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A one-way coupled DEM-CFD scheme to mode free-surface flows in tumbling mills
There is a great need in the minerals processing industry for accurate prediction of slurry flows in tumbling mills. This flow is currently best understood through empirical, mechanistic and computational models. In the case of computational models, a realistic description of the system requires …
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A DEM numerical modelling approach to simulating size segregation of media in a stirred mill and effects on grind characteristics
Comminution is an important operation in the minerals processing industry. In both traditional and stirred mills, single-sized grinding beads are used, along with multiple passes through the mills, to achieve a sufficient size-reduction ratio. It is plausible to expand the size reduction …
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Removal of trace elements from coal using a multiple-property processing circuit
… Researchers at the Virginia Center for Coal and Minerals Processing have developed a multiple-property processing circuit capable of providing high rejections of ash-forming mineral matter and pyritic sulfur. Reductions were expected for trace elements associated with the mineral matter and …
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Modelling of the mixing characteristics and flotation kinetics of the collection zone in flotation columns
… flotation has gained worldwide acceptance in the minerals processing industry in the past decade. This has been due the operating characteristics of flotation columns which can produce improved grades and recoveries over conventional cells. Added to this, flotation columns are both simple to …
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Metal sulphide precipitation : effect of operational parameters on particle characteristics and process efficiency
… long-term environmental challenges facing the minerals processing industry. Uncontrolled discharges have polluted thousands of kilometres of rivers, as well as surface and groundwater bodies with acidic effluents high in dissolved metals and sulphate. Conventional treatment technologies rely on …
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Flotation in a novel oscillatory baffled column
… potential future role of OBC technology in the minerals processing industry. The results of this thesis clearly show that the OBC is a promising novel technology for the treatment of fine mineral slurries. The cell has been demonstrated to significantly improve flotation kinetics by a factor of …
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The effects of strikes on the share returns of gold and platinum mining companies
… Africa is one of the world's leading mining and minerals-processing countries, accounting for 8.2% of gross domestic product (GDP). Labour strikes are a platform that enable workers to demonstrate their dissatisfaction towards their employer concerning labour relations issues. Mining strikes in …
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Application of life cycle assessment in process design: case study on SO₂ abatement technologies in the PGM sector
… the negative impacts of their mining and mineral processing operations. Technical innovation to improve future plant designs, as well as the development of management policies, guidelines and protocols for efficient operation of process plants has therefore become a strategic priority for the …
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Optimization of spodumene flotation with fatty acid collectors
At present, hard-rock minerals like spodumene (LiAlSi2O6) – concentrated by dense media separation (DMS) and/or froth flotation – represent >50% of global lithium production. A major process challenge in spodumene beneficiation is poor flotation selectivity stemming from insolubility of the tall …
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Scale-up behavior of the froth stability measurement
… used physio-chemical separation method in the minerals processing industry. Two distinct phases are present, namely: the pulp and froth phase. Flotation research has heavily focussed on the pulp performance; however only recently it was found that the froth performance contributes significantly …
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