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Quantitative Mineralogical Comparison between HPGR and Ball Mill Products of a Sn-Ta Ore Ahmad Hamid, Sarbast Alfonso Abella, María Pura Anticoi, Hernan Guasch, Eduard Oliva, Josep Dosbaba, Marek Garcia Vallès, Maite Chugunova, Marina Mineralogia Jaciments minerals Mineralogy Mineral deposits 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 m (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 m 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 m should be ground more. 2018-06-15T09:15:20Z 2018-06-15T09:15:20Z 2018-04-11 2018-06-15T09:15:20Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.3390/min8040151 Minerals, 2018, vol. 8, num. 4, p. 151 https://doi.org/10.3390/min8040151 info:eu-repo/grantAgreement/EC/H2020/642201/EU//OptimOre cc-by (c) Ahmad Hamid, S. et al., 2018 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess MDPI Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)