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Microanalysis study of Al-Amar rock and leaching behavior of its tailings for recovery of gold and silver

Treść / Zawartość
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Some Saudi gold ores, such as that at Al-Amar mine, suffer from low leaching efficiency using the toxic cyanidation process. Only about 60% of the gold and 26% of the silver in the feed ore can be extracted at 0.2% CN– after 24 h and the rest percentages of these metals remained in leaching residues (tailings). These tailings contained 1.1 ppm Au and 4.3 ppm Ag. Reprocessing of tailings serves both for economic and environmental reasons. A petrography analysis of the mineral constituents indicated that the rock samples consisted primarily of sphalerite, chalcopyrite, pyrite and galena in decreasing order of abundance. An electron probe microanalysis quantitatively showed that gold and silver were finely distributed in the grain boundaries and within sphalerite, chalcopyrite, pyrite, and quartz. The dissemination of gold and silver in these hard minerals may be the main reason for their low recovery by cyanidation. Open air roasting of the tailings can release amounts of the disseminated gold and silver which can be extracted during leaching with the harmless thiosulfate ion S2O32–. After studying the different parameters, we found that the maximum possible extraction of gold and silver from the tailings roasted for 2 h at 400°C reached about 50% at 0.2 M ammonium thiosulfate, 0.3 M ammonium hydroxide, solid–liquid ratio ½ for 24 h. These achievements represent a possible exploitation of the accumulated 1.65 million Mg tailing waste containing significant amounts of gold and silver valued at about $73 million.
Słowa kluczowe
Rocznik
Strony
527--537
Opis fizyczny
Bibliogr. 19 poz., rys., tab.
Twórcy
  • Chemistry Department, College of Science, Taif University, Taif, Saudi Arabia
  • Central Metallurgical Research and Development Institute, P.O. Box 87, Helwan, Cairo, Egypt
autor
  • Biotechnology Department, College of Science, Taif University, Taif, Saudi Arabia
  • Ceramic Department, Natural Resources Division, National Research Center, Cairo, Egypt
autor
  • Chemistry Department, College of Science, Taif University, Taif, Saudi Arabia
Bibliografia
  • AGANGI A., PRZYBYŁOWICZ W., HOFMANN A., 2015. Trace element mapping of pyrite from Archean gold deposits – A comparison between PIXE and EPMA. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 348, 302-306
  • AYATA S., YILDIRAN H., 2001. A novel technique for silver extraction from silver sulfide ore. Turk. J. Chem. 25, 187–191.
  • BEAN S. L., 1997, Thiosulfates. In: Kroschwitz, J. I. (Ed.), Kirk-Othmer Encyclopaedia of Chemical Technology. John Wiley & Sons Inc., New York, pp. 51–58.
  • CELEP O., DENIZ BAS A., YAZICI E., ALP İ., DEVECI H., 2015. Improvement of Silver Extraction by Ultra–fine Grinding Prior to Cyanide Leaching of the Plant Tailings of a Refractory Silver Ore. Miner. Process. Extr. Metall. Rev.36, 227-236.
  • FENG D., VAN DEVENTER J. S. J., 2010. Oxidative pre-treatment in thiosulfate leaching of sulfide gold ores. Int. J. Min. Proc. 94, 28–34.
  • FÖLDVÁRI M., 2011. Handbook of thermogravimetric system of minerals and its use in geological practice. BUDAPEST, Geological Institute of Hungary.
  • HARBI H. M., ELDOUGDOUG A. A., AL JAHDLI N. S., 2006. Evolution of the Arabian Shield and associated mineralizations with emphasis on gold mineralization. The 9th Arab Conference for Mineral Resources.
  • HOLLEMAN A. F., WIBERG E., 2001. Inorganic Chemistry. Academic Press: San Diego.
  • KONDRAT’EVA T., PIVOVAROVA T., BULAEV A., MELAMUD V., MURAVYOV M., USOLTSEV A., VASIL’EV E., 2012. Percolation bioleaching of copper and zinc and gold recovery from flotation tailings of the sulfide complex ores of the Ural region, Russia. Hydrometall. 111–112, 82–86.
  • LA BROOY S. R., LINGE H. G., WALKER G. S., 1994. Review of gold extraction from ores. Miner. Eng. 7, 1213–1241.
  • MAHMOUD M. H. H., AWAD H. M., ALHABIB O., 2015. Gold leaching from a Saudi ore by the nonpolluting thiosulfate process. Physicochem. Probl. Miner. Process. 51, 59–72.
  • MALUSEL V. A., POPA I. F., GOLDSTEIN J., OSANU L. R., 2012. Gold and silver extraction technology. World Intellectual Property Organization (WIPO)–Patent Cooperation Treaty (PCT), international publication number WO/2012/141607 A1, 18 Oct.
  • MARSDEN J., HOUSE, C., 2006. Chemistry of gold extraction (2nd ed.). Littleton, CO, USA: Soc. Min. Metal. Explor.
  • SALINAS-RODRÍGUEZ E., HERNÁNDEZ-ÁVILA J., RIVERA-LANDERO I., CERECEDO-SÁENZ E., REYES VALDERRAMA M., CORREA-CRUZ M., RUBIO-MIHI D., 2016. Leaching of silver contained in mining tailings, using sodium thiosulfate: A kinetic study. Hydrometallurgy 160, 6–11.
  • SRITHAMMAVUT W., LUUKKANEN S., LAARI A., KANKAANPÄÄ T., TURUNEN I., 2011. Kinetic modeling of gold leaching and cyanide consumption in intensive cyanidation of refractory gold concentrate. J. Univ. Chem. Tech. Metal. 46, 181–190.
  • SUROUR A. A., BAKHSH R., 2013. Microfabrics and microchemistry of sulfide ores from the 640 FW-E level at the Al-Amar Gold mine, Saudi Arabia. J. Microsc. Ultrastruct. 1, 96–110.
  • SUROUR A. A., HARBI H. M., AHMED A. H., 2014. The Bi’r Tawilah deposit, central western Saudi Arabia: Supergene enrichment of a Pan-African epithermal gold mineralization. J. Afr. Earth Sci. 89, 149–63.
  • WAN R. Y., LE VIER M., MILLES J. D., 1993. Research and development activities for the recovery of gold from non-cyanide solutions. Hydrometal. Fund. Tech. Innov., Chapter 27.
  • ZHANG X. M., SENANAYAKE G., NICOL M. J., 2008. Beneficial effect of silver in thiosulfate leaching of gold. Hydrometallurgy 2008, Proc. 6t 22(5), 419-433.
Uwagi
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-81898333-13f1-4a9a-8f6e-ca5451479c38
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