Sorokina E.S.,Russian Academy of Sciences |
Litvinenko A.K.,Russian State Geological Prospecting University |
Hofmeister W.,Johannes Gutenberg University Mainz |
Hofmeister W.,Center for Gemstone Research |
And 5 more authors.
Gems and Gemology | Year: 2015
Discovered during the late 1970s, the Snezhnoe ruby and sapphire deposit in Tajikistan was active until the collapse of the former Soviet Union in the early 1990s and the outbreak of regional conflicts. This marble-hosted occurrence has seen renewed interest, as it is a large and potentially productive deposit that has not been sufficiently studied. Testing of samples identified solid inclusions of margarite enriched with Na and Li (calcic ephesite or soda margarite). These are believed to be previously unreported for gem corundum. Allanite, muscovite, and fuchsite (chromium-bearing muscovite) were identified for the first time in ruby and sapphire from Snezhnoe. These and other inclusions such as zircon, rutile, Kfeldspar, and Ca-Na-plagioclase could serve to distinguish them from stones mined elsewhere. Concentrations of trace elements were typical for ruby and sapphire of the same formation type. The highest Cr concentrations were observed within the bright red marble-hosted rubies, and these values were very similar to those of the famous Burmese rubies from Mogok. © 2015 Gemological Institute of America.
Markovic R.,Mining and Metallurgy Institute |
Stevanovic J.,University of Belgrade |
Avramovic L.,Mining and Metallurgy Institute |
Nedeljkovic D.,University of Belgrade |
And 3 more authors.
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2012
The aim of this study is synthesis of copper-sulfate pentahydrate from the waste sulfuric acid solution-mother liquor generated during the regeneration process of copper bleed solution. Copper is removed from the mother liquor solution in the process of the electrolytic treatment using the insoluble lead anodes alloyed with 6 mass pct of antimony on the industrial-scale equipment. As the result of the decopperization process, copper is removed in the form of the cathode sludge and is precipitated at the bottom of the electrolytic cell. By this procedure, the content of copper could be reduced to the 20 mass pct of the initial value. Chemical characterization of the sludge has shown that it contains about 90 mass pct of copper. During the decopperization process, the very strong poison, arsine, can be formed, and the process is in that case terminated. The copper leaching degree of 82 mass pct is obtained using H 2SO 4 aqueous solution with the oxygen addition during the cathode sludge chemical treatment at 80 °C ± 5 °C. Obtained copper salt satisfies the requirements of the Serbian Standard for Pesticide, SRPS H.P1. 058. Therefore, the treatment of waste sulfuric acid solutions is of great economic and environmental interest. © 2012 The Minerals, Metals & Materials Society and ASM International.
Zivkovic D.,University of Belgrade |
Strbac N.,University of Belgrade |
Sokic M.,Institute for Technology of Nuclear and Other Mineral Raw Materials |
Andric V.,Vinča Institute of Nuclear Sciences |
And 4 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2014
Preliminary results of physicochemical investigation of some archaeometallurgical findings from Kmpije locality in vicinity of Bor (Serbia) are presented in this paper. Ancient samples of prehistoric origin were investigated using different instrumental analytic methods-chemical, differential thermal, X-ray diffraction, and energy dispersive X-ray fluorescence analysis. Obtained results indicate to the presence of ancient metallurgical activities, so locality Kmpije may be considered as an archaeometallurgical site, which should be investigated more in future for more precise details. © 2014 Akadémiai Kiadó, Budapest, Hungary.
Dragulovic S.,Mining and Metallurgy Institute |
Ljubomirovic Z.,Mining and Metallurgy Institute |
Simsic Z.S.,Mining and Metallurgy Institute |
Conic V.,Mining and Metallurgy Institute |
And 3 more authors.
Optoelectronics and Advanced Materials, Rapid Communications | Year: 2011
This paper presents the method of rhodium purification and separation from other platinum and non-precious metals. Separation of non-precious metals from rhodium acid solution was carried out using ion exchange. Process of solvent extraction was carried out to separate Pt (IV) and Pd(II) from rhodium by using TBP dissolved in petroleum ether. Platinum and palladium stripping was carried out with distillated water. Flow sheet of the process of pure rhodium winning of the 98.97% purity is presented in this paper. Obtained rhodium is convenient for usage among other purposes in electronic devices.