Mössbauer, TEM/SAED and XRD investigation on waste dumps of the Valea lui Stan gold mines
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The complementary investigation techniques, Mössbauer spectroscopy, transmission electron microscopy with selected area electron diffraction (TEM/SAED), X-ray diffraction (XRD) have been used to investigate the fate of the Valea lui Stan, Romania, gold-ore nanoscale-minerals during the long time of residence in the waste dumps. The preliminary investigations showed such waste dumps to contain significant amount of metals which cannot be identified by conventional methods. An intense research activity started up in order to evaluate the possibilities to recycle Valea lui Stan waste dumps and to recover metals by chemical or phytoextraction procedures. The waste dumps naturally show different mineral constituents with clay minerals as major phases, observed by XRD-technique. Although the waste dumps materials have whitish-yellowish colours, MÖSSBAUER technique evidences the presence of the finely dispersed iron bearing minerals. The authors are focusing to inspect and analyze Fe-compounds in the samples collected from Valea lui Stan’s waste dumps in order to identify the magnetic phases by Mössbauer technique.
KeywordsMössbauer TEM/SED XRD Waste dump Iron oxides
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- 1.Udubasa, S.S., Popescu-Pogrion, N., Popescu, I.V., Constantinescu, S., Udubasa, G.: Mineralogical and structural fingerprint methods of nanominerals’ identification. J. Sci. Arts 2(9), 323–331 (2009)Google Scholar
- 2.Udubasa, S.S., Constantinescu, S., Grecu, M.N., Popescu-Pogrion, N., Udubasa, G., Popescu, G.C., Tolea, F., Popescu, I.V.: Structural (EM, XRD, NGR, ESR) investigations on some sulphides from Costesti, Valea lui Stan and Jidostita gold ores (Southern Carpathians, Romania). Rom. J. Phys. 52(1–2), 93–104 (2007)Google Scholar
- 3.Finch, J., Gainsford, A.R., Tennant, W.C.: Polarized optical absorption and 57Fe Mössbauer study of pegmatitic muscovite. In: Stevens, J.G., Khasanov, A.M., Miller, J.W., Pollak, H., Li, Z. (eds.) Mössbauer mineral handbook. Am. Mineral. 67, 59–68 (1982)Google Scholar
- 4.Cornell, R.M., Schwertzmann, U.: The iron oxides: structure, properties, reactrions, occurences, uses. Wiley-VCH, Verlag GmbH & Co KGaA Weinheim, ISBN: 3-527-30274-3 (2003)Google Scholar
- 5.Murad, E.: Properties and behavior of iron oxides as determined by mössbauer spectroscopy. In: Stucki, J.W., et al. (eds.) Iron in soils and clay minerals, issue C12, pp. 309–350. D. Reidel Publishing Company, Dordvecht, NED and Boston, MA (1988)Google Scholar
- 6.Murad, E., Cashion, J.: Mössbauer spectroscopy of environmental materials and their industrial utilization. Kluwer Academic (2004)Google Scholar