Effect of frothers on bubble size |
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| Institution: | 1. Helsinki University of Technology, Helsinki, Finland;2. British Columbia University, Vancouver, B.C., Canada;1. Department of Mining Engineering, Universidad de Chile, Santiago, Chile;2. Advanced Mining Technology Center, AMTC, Universidad de Chile, Santiago, Chile;3. Department of Chemical and Environmental Engineering, Federico Santa Maria Technical University, Valparaso, Chile;1. Centre for Multiphase Processes, The University of Newcastle, Callaghan, NSW 2308, Australia;2. The School of Mining Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;3. Department of Physical Chemistry, Sofia University, 1 James Bourchier Blvd, 1164 Sofia, Bulgaria;1. Mining & Mineral Resources Division, Department of Business Administration, Chinalco China Copper Corporation Limited, Beijing 100082, China;2. Department of Mining and Materials Engineering, McGill University, Montreal, QC, H3A 0C5, Canada;1. Department of Mining Engineering, West Virginia University, 365 Mineral Resources Building, 1374 Evansdale Drive, Morgantown, WV, 26506, USA;2. Department of Mining Engineering, Arak University of Technology, Arak, Iran;3. Department of Mining Engineering, Tarbiat Modares University, Tehran, Iran |
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| Abstract: | The size of bubbles in flotation cells was measured using the UCT bubble size meter and the HUT bubble size analyser. While both methods provided similar critical coalescence concentration (CCC) values for the three tested frothers, they also revealed important differences. Using the HUT bubble size analyser, which does not impose any lower bubble size limit, it was possible to find differences in bubble size measured for three frothers at concentrations exceeding the corresponding CCC values.Frothers affect both the break-up phenomena in the impeller/stator zone in flotation cell, and bubble coalescence. While longer chain polyglycols (e.g. DF-1012) are able to produce larger stable bubbles than the short chain DF-250 and DF-200 polyglycols, the CCC values for DF-1012 are lower than those for DF-250 and DF-200. |
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