Influence of coal particles on froth stability and flotation performance |
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| Affiliation: | 1. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China;2. National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China;1. School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia;2. Pionera, P.O. Box 162, NO-1701 Sarpsborg, Norway;1. Centre for Multiphase Processes, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia;2. School of Mining Engineering, University of New South Wales, Sydney, NSW 2052, Australia;1. Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China;2. Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China |
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| Abstract: | Solid particles have significant effect on flotation froth. In this research, the effects of coal particles of different size and hydrophobicity on froth stability and flotation performance were studied. The froth stability was measured in both the froth formation and froth decay processes by maximum froth height, froth half-life time and water recovery. The results show that fine particles of moderate hydrophobicity contributed most to maximum froth height in the froth formation process and were most favorable for flotation. Fine hydrophilic particles stabilized the froth in the froth formation process but the froth half-life time was very short due to the high water solid ratio. High hydrophobic particles of both fine and coarse size fractions greatly increased the froth half-life time in the froth decay process. But the froths were very rigid and the maximum froth heights were very low. The presence of fine hydrophobic particles was very unfavorable for the recovery of coarse particles. |
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| Keywords: | Coal particles Flotation Froth stability Particle size Hydrophobicity |
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