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Showing 1 to 14 of 14 for “"Coal Flotation"”.
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Hydrodynamic studies and mathematical modeling of fine coal flotation
… This analysis has allowed the rate constant for flotation to be evaluated as functions of bubble sine, particle size, flotation column diameter, air flow rate and critical film rupture thickness. The last parameter is a measure of the hydrophobicity of the particles to be floated. Using the …
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A comprehensive study of the electrochemistry and floatability of pyrite in coal flotation
… (FeS₂) is the major source of sulfur in various coals, and its efficient removal has proven to be a more difficult task than expected. Flotation is generally considered to be the most practicable process for the preparation of coal fines. However, even this technique is usually unable to remove …
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Residual Diesel Range Organics and Selected Frothers in Process Waters from Fine Coal Flotation
… the potential fates of processing reagents in a coal preparation plant. The focus is specifically on petro-diesel (termed "diesel" in this paper), which is used as a collector in the flotation of fine coal. Diesel range organics (DRO) and polyaromatic hydrocarbons (PAHs) are measured in aqueous …
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Bubble Size Effects in Coal Flotation and Phosphate Reverse Flotation using a Pico-nano Bubble Generator
Froth flotation is widely used in minerals industry. However, it is effective in a narrow size range, nominally 45--250 mum for coal and 10--150 mum for minerals. And the flotation performance of coal and minerals beyond this size range is not quite satisfactory. It is now recognized that the …
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The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes
… in an attempt to explain observed differences in flotation behaviour with -500 μm unbeneficiated bituminous coal. Collectors were synthesis grade and commercial stocks of aromatic and aliphatic oils; MIBC was the frother. Oil dispersions were analyzed using a Coulter Counter. All the oils were …
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Reverse flotation : a novel process for the beneficiation of fine coal
The beneficiation of ultrafine coal by froth flotation is a widely used process, and its importance for the treatment of -0.1 mm coal has been appreciated of late in South African coal washing plants. A number of problems adversely affect the efficiency of this process, such as poor liberation, …
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Using froth flotation to mitigate acid rock drainage risks while recovering valuable coal from ultrafine colliery wastes
… of an investigation to develop a two-stage flotation process to produce: (i) a low-volume sulfide-rich concentrate that can be treated chemically or biologically or disposed of in a contained manner; (ii) a high-volume (low sulfur) benign tailings, with low ARD potential compared to …
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Combining froth flotation and reflux classification to mitigate ARD generating potential of the Waterberg and Witbank coal ultrafines via sulfide removal
… South Africa, over 10 million tons of ultrafine coal wastes are discarded every year, typically in the form of ultrafine slurries. These fines have a high calorific value, and contain sulfur minerals, particularly pyrite. The high calorific value of these discards leads to a waste of energy that …
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A study of floatation froth behavior
… understanding of the role of the froth phase in coal flotation, froth stability measurements have been conducted using a continuous flotation cell. The results indicate that the mass flow rate of coal or mineral matter reporting to the product is linearly related to the flow rate of water …
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Redesign of Industrial Column Flotation Circuits Based on a Simple Residence Time Distribution Model
… for improved selectivity has made column flotation cells a popular choice for upgrading fine coal. Unfortunately, recent production data from full-scale column plants indicate that many industrial installations have failed to meet original expectations in terms of clean coal recovery. …
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Identification of Improved Stratigies for Processing Fine Coal
In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often …
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Improved strategies for processing fine coal streams
In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often …
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Development of Methods to Aid in Flotation Circuit Evaluations and Drip Pan Design
… establish the performance capabilities of a new flotation technology for fine coal upgrading, known as StackCell flotation. Flotation release analysis was performed on all samples to determine the amount of hydrophilic material present in the streams around the flotation cell. Data from this work …
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Optimum Processing of 1 mm by Zero Coal
Coal in the finer particle size ranges (below 1 mm) has always suffered from poor cleaning efficiencies. This problem has been exacerbated in recent years with the increased amount of high ash fines due to continuous mining machines and the mining of dirtier coal seams. In the present work, it is …