Exploiting the dual functions of polymer depressants in fine particle flotation |
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| Authors: | Qi Liu David Wannas Yongjun Peng |
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| Institution: | aDepartment of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6;bCOREM, 1180 rue de la Minéralogie, Quebec City, Quebec, Canada G1N 1X7 |
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| Abstract: | Fine hydrophilic particles are known to be entrained with water in flotation of many ores. Flocculation of the hydrophilic particles by polymer depressants could potentially reduce the mechanical entrainment of these particles. This paper reports testwork completed on fine particles of several solids, iron oxide, hydroxyapatite and sphalerite, as well as on a relatively coarse quartz sample (− 75 + 38 μm). Dodecylamine was used as a collector for quartz, and several dispersants and polymer depressants, including sodium silicate, sodium metaphosphate, zinc sulfate, cornstarch, corn dextrin and carboxymethyl celluloses (with molecular weights of both 700,000 and 80,000) were used as flotation modifiers. The major part of the testwork involved flotation tests in a 200 mL flotation column. It was observed that flocculation of the fine hydrophilic particles significantly reduced their mechanical entrainment, while dispersion severely aggravated it. Thus, in the flotation separation of synthetic mixtures of the − 75 + 38 μm quartz and fine (reagent grade) iron oxide or hydroxyapatite, polymer depressants that caused flocculation performed better than those that did not cause flocculation. |
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| Keywords: | fine particle flotation modifiers selective flocculation depressants |
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