The effect of particle size on heat of immersion of bituminous high volatile Pittsburgh seam coal
AuthorTjong, Fat Kwong
Mining & Metallurgical Engineering
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A Setaram C-80 heat flux calorimeter was used to measure the heat of immersion of Pittsburgh seam coal. The investigation was focused to determine the effect of the coal particle size on the heat of immersion in water, 20% methanol-water, and an immulsion of flotation agents. Flotation experiments were also performed on all particle sizes to correlate the flotation response with the heat of immersion study. It is determined that the heat of immesional increases exponentially with decreasing particle size in all immersional liquids. The increase is also seen in the flotation recovery with flotation mixture as immersional liquid. The heat of immersion values are the lowest when flotation agent mixture is used and highest in 20% methanol-water. The high values of AH;mm in 20% methanol-water is due to the more polarity of the mixture which results in a higher capability in complete wetting the coal surface and the ease of penetration by the mixture to the pore structure of coal than other immersional liquids. The decrease in flotation recovery is caused by the decrease in the hydrophobicity of coal as the particle size decrease, which is correlated with the heat of immersion. The low heat of immersion values using the flotation agent’s mixture are thought to be caused by the difficulty of the immersional liquid to penetrate the pore structure of coal due to the hydrophobic interaction of flotation agent with coal surface. In all immersional liquids, the slow increase in the heat of immersion is observed at low surface area indicating the initial incomplete wetting of the coal surface.
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