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Title: Quantitative Mineralogical Comparison between HPGR and Ball Mill Products of a Sn-Ta Ore
Author: Ahmad Hamid, S.
Alfonso Abella, María Pura
Anticoi, H.
Guasch, E.
Oliva, J.
Dosbaba, M.
Garcia Vallès, Maite
Chugunova, M.
Keywords: Mineralogia
Jaciments minerals
Mineral deposits
Issue Date: 11-Apr-2018
Publisher: MDPI
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Minerals, 2018, vol. 8, num. 4, p. 151
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ISSN: 2075-163X
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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