Experiences in using gas dispersion measurements to evaluate metallurgical performance of scavenger cleaner and recleaner circuit at Vale’s Thompson Mill

Abstract

The performance of a flotation circuit is largely the result of the operator’s response to visual clues. This includes manipulation of the gas input and how it is distributed to cells in a bank. A new gas dispersion technology was presented which was conducted to perform characterization tests in Outokumpu 30 m³ and 50 m³ flotation cells installed at Thompson Vale’s concentrator, and subsequent data analysis. The experimental program was designed to establish “as-found” baseline conditions for each cell of the two-parallel banks in the scavenger-cleaner and recleaner circuit, to select and characterize one typical cell in the two banks with either different frother concentrations or different air flow rates, and establish what variables can be manipulated in future characterization work. A three-parameter model was developed in order to link the bubble size and frother concentration. This relationship can be used to correlate gas dispersion change to improved metallurgical performance.

Keywords

bubble size / bubble size distribution / bubble surface area flux / gas dispersion

References

[1] DahlkeR, FinchJ A, GomezC O, CooperM, ScottD. Impact of air distribution profile on banks in a Zn cleaning circuit [C]. Proceedings of the 36th Annual Meeting of the Canadian Mineral Processors, 2004, Ottawa, Canada, CIM: 525-539

[2] ZhangW, NessetJ E, RaoS R, FinchJ A. Characterizing frothers through critical coalescence concentration (CCC95)-hydrophilic-lipophilic balance (HLB) [J]. Minerals, 2012, 2(3): 208-227

[3] ZhangW, ZhouX, FinchJ A. Determining independent control of dual-frother systems-gas holdup, bubble size and water overflow rate [J]. Minerals Engineering, 2012, 39: 106-116

[4] NessetJ E, Hernandez-aguilarJ R, AcunaC, GomezC O F J A. Some gas dispersion characteristics of mechanical flotation machines [J]. Minerals Engineering, 2006, 19: 807-815

[5] PyechaJ J, LacoutureB, SimsS, HopeG, TradlingA. Evaluation of a Microcell sparger in the Red Dog column flotation cells [J]. Minerals Engineering, 2006, 19: 748-757

[6] Hernandez-aguilarJ R, ThorpeR, MartinC J. Experiences in using gas dispersion measurements to understand and modify metallurgical performance [C]. Proceedings of the 38th Annual Meeting of the Canadian Mineral Processors, 2006, Ottawa, Canada, CIM: 387-402

[7] Hernandez-AguilarJ R, ReddickS. Gas dispersion management in a Cu/Mo separation circuit [C]. Proceedings of the 6th International Copper-Cobre Conference, 2007, Toronto, Canada, CIM: 173-184

[8] Hernandez-AguilarJ R, BasiJ. Improving column flotation cell operation in a Cu/Mo separation circuit [C]. Proceedings of the 41st Annual Meeting of the Canadian Mineral Processors, 2009, Ottawa, Canada, CIM: 39-61

[9] NessetJ E, ZhangW, FinchJ A. A benchmarking tool for assessing flotation cell performance [C]. Proceedings of 44th Annual Meeting of the Canadian Mineral Processors, 2012, Ottawa, Canada, CIM: 183-209

[10] ZhangW, KolahdoozanM, NessetJ E, FinchJ A. Use of frother with sampling-for-imaging bubble sizing technique [J]. Minerals Engineering, 2009, 22(5): 513-515

[11] HuY-h, MengX-l, SunWei. A novel quantificational assessment method of frothers effect on bubble characteristics [J]. Journal of Central South University of Technology, 2011, 18: 1910-1916

[12] ZhangW, ZhuS, FinchJ A. Frother partitioning in dual-frother systems: development of analytical technique [J]. International Journal of Mineral Processing, 2013, 119: 75-82

[13] CooperM, ScottD, DahlkeR, GomezC O, FinchJ A. Impact of air distribution profile on banks in a Ni cleaning circuit [J]. CIM Bulletin, 2004, 97(1083): 761-765

[14] RavichandranV, EswaraiahC, SakthivelR, BiswalS K, ManisankarP. Gas dispersion characteristics of flotation reagents [J]. Power Technology, 2013, 235: 329-335

[15] ZhangW, NessetJ E, FinchJ A. Water recovery and bubble surface area flux in flotation [J]. Canadian Metallurgical Quarterly, 2010, 49(4): 353-362

[16] GorainB K, FranzidisJ P, MalapigE V. The empirical prediction of bubble surface area flux in mechanical flotation cells from cell design and operating data [J]. Minerals Engineering, 1999, 12(3): 309-322