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 77 for “"mineral processing"”.
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Bayesian Methods for Mineral Processing Operations
… in demand have driven the development of complex processing technology for separating mineral resources from exceedingly low grade multi- component resources. Low mineral concentrations and variable feedstocks can make separating signal from noise difficult, while high process complexity and the …
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The effect of microwave radiation on mineral processing
… decrease the energy requirements. A variety of mineral ores have been investigated and the effects of microwave radiation quantified in terms of the mineralogy, changes in the Bond Work Index, flotability and magnetic separation. It has been shown that microwave pre-treatment is most effective …
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The Application of Mineral Processing Techniques to the Scrap Recycling Industry
… many standards, and test procedures in place for mineral processing. These standards and practices, if used in recycling, could aid recyclers in determining and achieving optimal separations for their plant.. New regulations for scrap imports into China make it difficult to obtain the metal …
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The effect of ore blends on the mineral processing of platinum ores
This thesis investigates the effect of ore blends on milling and flotation performance. Anglo Platinum's Waterval UG2 concentrator in Rustenburg processes ore from various shafts.
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Performance of the vertical roller mill in a mineral processing application when coupled with internal and external classifiers
Comminution is applied in all mineral processing plants where mineral liberation is needed for separation and concentration of valuable minerals. The process is energy intensive and is predominantly carried out in tumbling mills which are known to be highly inefficient. Comminution technologies …
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Socio-technical assessment of mercury and gold losses in artisanal and small-scale mining (ASM) operations in Colombia, A
… programs aimed at eliminating mercury from ASGM mineral processing systems, mercury use continues to be widespread. A number of scholars have emphasized that in order for miners to stop using mercury, any new technology must be at least or more efficient than mercury at recovering gold. However, …
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On-line moisture measurement of rocks, using microwave techniques
… of the moisture content of process streams in a mineral processing plant is vital for their efficient operation. Although many industrial moisture meters are available, most of these were designed to determine the moisture content of low density, fine grained, uniformly surfaced and low …
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The effect of recycle water quality on the flotation of a Platreef ore
… a lot of water for many activities including mineral processing, slurry transport, dust suppression and employee requirements. Apart from mining (3%), there are other competing demands for water from other sectors, for example, the municipal (6.1%), agricultural (62%), energy (2%), forestry …
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Investigation of the flotation behaviour of ball mill and IsaMill products
Valuable minerals that are used in various aspects of everyday life are buried in fossilised storages below the ground in the earth's crust. These minerals are mined as rocks which then have to be crushed in order to liberate these minerals of value. The liberated valuable minerals have to be …
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Numerical modelling of an oscillatory baffled column
… is presently being experimentally tested by the Mineral Processing Research Unit at the University of Cape Town. The commercial CFD code FLUENT 6.2.16 was used to create the modeL Numerical simulations were conducted to investigate the effects of di fferent methods of defining the oscillatory …
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The effect of phyllosilicate mineralogy and surface charge on the rheology of mineral slurries
Phyllosilicate minerals exist as common gangue components in many low grade ores. Often broadly classified as ‘clays’, this group of minerals is closely associated with several processing issues. Despite many good studies on the physico-chemical properties of phyllosilicates, there still remains a …
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THORIUM SPECIATION IN SYNTHETIC ANHYDRITE, PLACER ILMENITE CONCENTRATE, AND TITANIA SLAG: IMPLICATIONS FOR THORIUM GEOCHEMICAL BEHAVIOR, SEQUESTRATION, AND BENEFICIATION
… thorium speciation and distribution in ore minerals and related materials is of critical importance so that the thorium fuel cycle can be sourced as byproducts from metallurgical processes. The objective of this dissertation is to study thorium-bearing species in selected ore minerals and …
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Improving Efficiencies in Water-Based Separators Using Mathematical Analysis Tools
A better understanding of several mineral processing devices and applications was gained through studies conducted with mathematical analysis tools. Linear circuit analysis and population balance modeling were utilized to remedy inefficiencies found in a number of popular mineral processing …
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Design and construction of a vibration data logging prototype board for overland conveyor belts
… modern transportation systems in the mining and mineral processing industries. It is vital that the system is well maintained in order to minimise system downtime and maximise profit. The conveyor belt is the single most expensive item in the system. It must be monitored to pick up potential …
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Investigation of operating parameters in a vertical stirred mill
… to the depletion of coarser grained ores, more mineralogically complex ores are being treated. These complex ores usually have finer grained valuable minerals. Liberation of these finer grained valuable minerals lies in grinding finer. Grinding to these fine sizes is energy intensive and using …
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Integrated mining and preconcentration systems for nickel sulfide ores
… and evaluate integrated underground mining and mineral processing systems, work has been done to determine how to utilize the coarse rejects of pre-concentration in the underground environment. An amenability study for nine orebodies from four of Xstrata Nickel’s Ontario operations evaluated …
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Ammonia leaching as a pre-treatment for the processing of oxidised PGM ores
… in the need to adjust current conventional mineral processing technologies 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 …
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Elutriation Technology in Heavy Mineral Separations
… separators have been used in several different mineral processing fields for many years. Recent improvements in designs have led to the development of the CrossFlow separator. This new design employs a tangential feed system that has shown promise in several applications. This paper investigates …
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Evaluation of an advanced fine coal cleaning circuit
… technical and economic analyses of this processing scheme suggest it compares favorably with existing post-combustion desulfurization techniques. A detailed study of the MGS included the development of a model based on fundamental principles of fluid mechanics and mineral processing. The …
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