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Showing 1 to 20 of 48 for “"Flotation performance"”.
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Developing a relationship between ore feed grade and flotation performance
Flotation systems are complex, multifaceted and water-intensive. Prevalent water restrictions globally have made it a necessity for mining operations to recycle onsite process water. This recycling leads to increased ionic strength and may introduce deleterious ions dissolved in solution which …
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The implications of froth structure and surface appearance for flotation performance
In this work, the flotation step of mineral extraction has been investigated to determine the mechanisms through which input variables impact on flotation separation efficiency and, in particular, the froth zone in flotation. The novel contribution of the work is in terms of demonstrating the …
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The effect of ion accumulation owing to water recycling on flotation performance
… different unit operations; amongst them is froth flotation. Froth flotation is a multifaceted complex process which is water intensive and to manage water usage, the global mining industries are now recycling water. The recycled water may contain deleterious ions that affect the mineral surface, …
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The role of nitrogen on the flotation performance of a complex sulphide ore
This thesis focuses on the role of nitrogen on flotation performance of a sulphide PGM ore. Merensky ore obtained from Impala Platinum mine, Rustenburg, was used in laboratory batch flotation tests. Nitrogen addition was implemented during the conditioning and / or flotation stages of the test. In …
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Investigating the use of sodium metasilicate to improve the flotation performance of altered PGE ores
Mineral hydration is known to result in low flotation recoveries and grades within primary platinum group element ores worldwide. This is because the phyllosilicate minerals derived from hydration reactions of silicate minerals (i) form electrostatic coatings on valuable minerals that in turn …
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Investigating the use of sodium silicate to improve the flotation performance of Platreef and UG2 PGE ores
… gangue such as talc can be recovered via true flotation and hence lower the concentrate grade. The widespread mitigation methods in commodities other than PGM's, involve use of dispersants to reverse slime coating, use of rheology modifiers to lower pulp viscosity and depressants to hinder the …
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The effect of microbial load and water recycling on the flotation performance of a PGM bearing ore
… source water and water recycling within the flotation circuit have shown that these practices affect the flotation process performance. It is therefore important to understand the effect that components within recycled and reclaimed water may have on flotation performance. While research on …
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The effect of polysaccharides and inorganic dispersants on the surface characteristics of talc and the effect on the flotation performance of a Merensky ore
… of talc and how this relates to the flotation performance of Merensky ore. The rationale in investigating the talc changes are due to its naturally flotable nature and the downstream problems that result from its reporting to the concentrate causing difficulties disproportionate to …
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The effect of mixing thiol collectors in the flotation of pure sulphide ores
… (DTC) has been reported 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 …
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The use of machine vision to describe and evaluate froth phase behaviour and performance in mineral flotation systems
Within froth flotation, it is widely acknowledged that froth stability affects flotation performance. As a result, it is expected that through the effective management of froth stability, it would be possible to both control and optimise a flotation cell and bank. However, for this to be possible, …
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The effect of ore blends on the mineral processing of platinum ores
… 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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A determination of the effect of changing collector chain length under varying Water Quality
… solids (TDS). The froth and pulp zones in the flotation cell work interactively to recover minerals and changes to water quality affect both zones. The factors affect the behavior of minerals and chemical reagents, impacting flotation performance. According to literature, collector behavior can …
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Modelling the influence of the froth phase on recovery in batch and continuous flotation cells
… be achieved by using data obtained from a batch flotation cell. A batch flotation cell has a distinct advantage of being suitable for generating, rapidly, large amount of data. However, the non-steady behaviour of froths found in this type of cell require a robust methodology for extracting the …
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Investigation of the effect of hydrocarbon spillages and their interaction with alteration minerals on the flotation of UG2 PGE ore
… linked to the reduction of downstream flotation performance. Anecdotal evidence suggests that such problems are further exacerbated in the presence of phyllosilicate alteration minerals (serpentine, chlorite and talc) from weathered or altered ores. The near-surface Two Rivers Platinum …
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Considering the action of frothers under degrading water quality
Froth flotation is a highly water-intensive process which is under scrutiny due to scarce fresh water supplies and increasingly strict environmental regulations with regards to polluted water discharge. This is driving the mining industry to use recycled water for their operations, which is usually …
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Optimization of spodumene flotation with fatty acid collectors
… 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 oil fatty acid (TOFA) collectors. Studies from the 1960s first …
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An investigation into the process mineralogy of the Merensky reef at Northam Platinum Limited
… Merensky reefs at Northam Platinum Ltd and their flotation performances. Flotation performance was measured in terms of the grade and recovery of the base metal sulphides (chalcopyrite, pentlandite, pyrrhotite and total sulphide) as well as through investigation of mass-water recoveries.
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Investigating depressant behaviour in the flotation of selected Merensky ores
This study utilised laboratory batch flotation tests to characterise the flotation performance, with respect to sulfide and gangue minerals, of two Merensky ores with different mineralogy, in the presence of depressants; and contributes to the increased understanding of depressant behaviour in the …
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Considering the effect of pulp chemistry during flotation on froth stability
On an industrial scale the need for improved flotation performance is of high importance in the current economic climate. Studies have shown that the pulp phase chemistry has a strong effect on the froth phase and therefore it is necessary to investigate how the manipulation of pulp chemistry …
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Multivariable control of a rougher flotation cell
… of a closed loop control system on a rougher flotation cell that could improve PGM flotation performance. A PGM rougher flotation cell equipped with Online Stream Analysis (OSA) and machine vision system (SmartFroth) was used during the investigation. Online measurements included bubble …
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