Effect of entrainment in bubble load measurement on froth recovery estimation at industrial scale |
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| Affiliation: | 1. Automation and Supervision Centre for Mining Industry, CASIM, Department of Chemical and Environmental Eng., Federico Santa Maria Technical University, P.O. Box 110-V, Valparaíso, Chile;1. Universidade Federal do Rio Grande do Sul (UFRGS), Department of Mining Engineering – PPG3M-LTM, Av. Bento Gonçalves, 9500, Prédio 75, Sala 124, Porto Alegre, RS, Brazil;2. Centro de Tecnologia Mineral - CETEM/MCTI, Rio de Janeiro, Brazil;1. Department of Mineral Engineering, University of Mines and Technology, P.O. Box 237, Tarkwa, Ghana;2. Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Adelaide, SA 5095, Australia;1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China;2. Hubei Key Laboratory of Mineral Resources Processing & Environment, Wuhan University of Technology, Wuhan 430070, Hubei, China;3. CSIRO Mineral Resources, Private Bag 10, Clayton South, VIC 3169, Australia |
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| Abstract: | Froth recovery was calculated in a 130 m3 mechanical cell of a rougher flotation circuit. This was done by bubble load determinations along with mass balance surveys. Valuable grade in the bubble load decreased in the ?38 μm due to fine particles entrained to the chamber of the device. The effect of fine particle entrainment on froth recovery was evaluated. A comparison between results from the raw bubble load data (assuming all particles were transported by true flotation) with those from corrected bubble load information (subtracting fine particle entrainment) was carried out. Entrainment occurred due to hydraulic transport in the bubble rear, which corresponds to the worst case scenario for froth recovery estimation. Results showed that the relative error was less than 0.3%, which allowed validation of the bubble load measurement as an effective methodology for froth recovery estimation at industrial scale. |
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| Keywords: | Froth recovery Bubble load Entrainment Flotation |
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