DOI: 10.5593/SGEM2014/B13/S4.107


I. Arribas,A. Bonilla, A. R. Avello,S. E. Bengy
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 839-850 pp

This paper confirms the advantages of the release impurity-bearing minerals from quartz samples using two different comminution technologies such as the “Selfrag” high voltage fragmentation (HV), compare with conventional milling (CM). For this study, bulk samples of quartz of hydrothermal origin from “Sierro” quartz veins in the province of Salamanca in western Spain were used. Mineralogical and chemical studies using transmitted light microscopy, XRF and XRD were conducted on bulk rock samples, samples fragmented using CM and HV methods, and on various size fractions prepared to attain greater efficiency in ore processing and removal of impurities. Fragmentation using HV "SelFrag" resulted in a high degree of release of impurities, in particular in the coarser size fractions and in rounded mineral particles with abundant cracks perpendicular to the surface of the mineral surface. By comparison, using mechanical grinding, the mineral particles show angular shapes with micro-cracks preferentially oriented subparallel to the mineral surface and the rate of release of secondary minerals is clearly inferior and only better in the finer particle size fractions.

Keywords: purification, fragmentation by high voltage, mechanical grinding, hydrothermal quartz, impurities.

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