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Automatización de la identificación mineralógica de concentrados aluvionares

AuthorsMartín Rubí, J. A.; Valle Fuentes, Francisco José ; García-Guinea, Javier
Issue Date2003
CitationIV CONGRESSO IBÉRICO DE GEOQUÍMI CA: Coimbra, 14 a 18 de Julho de 2003
AbstractThe collection and concentration of REE minerals from fluvial and Galician coastal sands were performed by gravimetric, electrostatic and magnetic methods. The second step was carried out under the polarizing microscope by the dull procedure of separating each grain mineral, by hand with a steel-needle, up to 32 different mineral species from the same concentrate that were later identified by the XRD, EMPA and XRF techniques. Finally, in the third step, an automatic mineral identification is proposed using image software (SigmaScan Pro 5.0) with bitmap pictures of the mineral grains taken by a Nikon Coolpix 950 camera coupled to a microscope Nikon Eclipse E600-POL. The counting of grains and the measurement of geometrical factor, size, colour or B/W is automatic. The program allows recording up to different 50 measurements for each grain, however only colour or BW status and geometric factor are valuable to mineralogical identification. The automatic analytical routine needs to be supported on the mineralogical background obtained by the former data of XRD, EMPA and XRF. The technique is proposed for specific detrital mineral research in which the counting ratio of mineral number is needed (garnet, ilmenite, diamond, corundum).
Appears in Collections:(MNCN) Comunicaciones congresos
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