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Minerals 2018, 8(4), 151;

Quantitative Mineralogical Comparison between HPGR and Ball Mill Products of a Sn-Ta Ore

Departament d’Enginyeria Minera, Industrial i TIC, Universitat Politècnica de Catalunya Barcelona Tech, Av. Bases de Manresa 61-63, Manresa, 08242 Barcelona, Spain
TESCAN, Libušina tř. 21, 62300 Brno, Czech Republic
Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Carrer Martí i Franquès, s/n, 08028 Barcelona, Spain
Author to whom correspondence should be addressed.
Received: 16 February 2018 / Revised: 4 April 2018 / Accepted: 5 April 2018 / Published: 11 April 2018
(This article belongs to the Special Issue Process Mineralogy of Critical Metals)
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The mineralogy and liberation characteristics of the comminuted Penouta leucogranite host of the Sn-Ta ore were determined. Grinding developed by a combination of high-pressure grinding rolls (HPGR) followed by a ball mill (BM) was compared with a single ball mill process. The mineral characteristics of the grinding products were analyzed using a Tescan Integrated Mineralogical Analyzer (TIMA-X) and X-ray powder diffraction (XRD). The ore contains 103 ppm of Ta and is mainly composed of quartz, albite, microcline, muscovite, and kaolinite. Nb, Ta-rich minerals are columbite-(Mn) and tantalite-(Mn), as well as minor microlite and wodginite. The liberation in the product is high in the size fraction of less than 250 µm (51–52 wt % for columbite-group minerals (CGM) and 74–80 wt % for cassiterite) and reduced in larger particles (8.8–17 wt % for CGM and 28–37 wt % for cassiterite). The recovery in the −250 µm fraction was high, while in the larger fraction it is limited, remaining up to 80 ppm in some tailings. The combined use of HPGR and a BM reduces the particle size distribution of the product and, thus, increases the liberation of the ores. Smaller fractions can be treated directly using gravity methods; however, particles of a size greater than +250 µm should be ground more. View Full-Text
Keywords: tantalum; liberation; process mineralogy; grinding; high-pressure grinding rolls; ball mill tantalum; liberation; process mineralogy; grinding; high-pressure grinding rolls; ball mill

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Hamid, S.A.; Alfonso, P.; Anticoi, H.; Guasch, E.; Oliva, J.; Dosbaba, M.; Garcia-Valles, M.; Chugunova, M. Quantitative Mineralogical Comparison between HPGR and Ball Mill Products of a Sn-Ta Ore. Minerals 2018, 8, 151.

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