Mineralogical and Geochemical Features of Native Gold in Combustion Products of Coal from the Erkovetsky Deposit (Upper
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MINERAL DRESSING
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Mineralogical and Geochemical Features of Native Gold in Combustion Products of Coal from the Erkovetsky Deposit (Upper Amur Region) A. P. Sorokina*, A. A. Konyushokb**, O. A. Ageevb, and V. M. Kuz’minykhb a
Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences, Blagoveshchensk, 675000 Russia *e-mail: [email protected] b Amur Science Center, Far East Branch, Russian Academy of Sciences, Blagoveshchensk, 675000 Russia **e-mail: [email protected] Received May 31, 2019 Revised June 17, 2019 Accepted July 3, 2019
Abstract—A bulk coal sample from the Erkovetsky deposit is studied at Amur experimental and engineering facility. Separate fractions of coal combustion products (slag, fly ash, and sludge) are obtained for the first time, in which the morphology, fineness of gold and composition of inclusions have been studied. A consistent decrease in gold size and content is determined after coal combustion, transportation in a gas-smoke stream, and subsequent condensation. A comparative analysis of gold in the combustion products of coal and in ore bodies of the mountain-folded framing of the Zeya-Bureya basin is carried out, the ways of gold migration to peat bogs are considered. Keywords: Experimental and engineering facility, separate acquisition of combustion products, native gold, extraction, gold sources, mechanisms of gold migration to peat bogs. DOI: 10.1134/S1062739119045990
INTRODUCTION
In recent decades, studies of brown coals and products of their combustion conducted in Siberia, Transbaikalia, Russian Far East, Uzbekistan, the USA, China and other countries have determined the presence of metals and elements in them, which are profoundly imporatnt for high-tech industries. The available materials make it possible to consider coals as a possible source of strategically important trace (Ge, Ga, U, V, Se), rare-earth elements (Y, Sc, Nb), noble metals (Au, Ag, Re), as well as Al and Mg [1]. Extraction and use of these elements from coals will give precedence, making this source an economically and environmentally attractive resource, especially for China, the USA, Russia, India and other countries. The above elements can be extracted from the combustion products of coal; therefore, a very promising trend is the detection of coals with increased concentrations of the mentioned microcomponents and the development of technologies for their extraction. To do this, first of all, it is necessary to study the distribution of mineral substance in separately obtained fractions, which allows identifying the most promising product for researching it as a possible industrial source of noble, rare metals and rare earth elements. Investigations of A
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