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The Frothbuster A solution to frothing thickeners. Authors: Ian Arbuthnot - Outokumpu Technology Pty Ltd Carla Kaboth Normandy Mining Ltd (Golden Grove) ABSTRACT One of the most common problems in the thickening of mineral flotation concentrates is the flotation of solids within the thickener as a result of the presence of fine air bubbles in the thickener feed.