Mechanism of Thermochemical Interaction between Old Copper Ore Flotation Tailings and Chlorammonium Reagents
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MINERAL DRESSING
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Mechanism of Thermochemical Interaction between Old Copper Ore Flotation Tailings and Chlorammonium Reagents N. L. Medyanika*, E. V. Leont’evaa, E. R. Mullinaa, and O. A. Mishurinaa a
Nosov Magnitogorsk State Technical University, Magnitogorsk, 455000 Russia *e-mail: [email protected] Received May 12, 2020 Revised May 20, 2020 Accepted May 29, 2020
Abstract—The article addresses processability of old copper–zinc ore flotation tailings. Potential reserves and processability of mining waste are considered in terms of Uchaly Mining and Processing Plant. The mineral composition and chemistry of old tailings are determined. The analysis of modes of interaction between gold and tailings minerals reveals inefficiency of conventional technologies in extraction of valuable components. The authors validate thermochemical processing technology for old tailings with gold and silver recovery using chlorammonium reagents. The thermal study determines the mode of thermochemical interaction of old flotation tailings with NH4Cl and NH4Cl – NH4NO3 mixture, efficient sequence of tailings processing with chlorammonium reagents and the optimum temperature ranges. Keywords: Old flotation tailings, rebelliousness, chlorammonium reagents, endo-effect, thermocheimical processing, synchronous thermal study. DOI: 10.1134/S106273912003674X
INTRODUCTION
Currently, the priority area for the development of mining and processing enterprises is the comprehensive recycling of man-made waste, the potential reserves of which in Russia is about 100 billion t [1, 2]. Involvement of man-made formations into processing allows not only expanding the raw material base significantly, but also helps to reduce the load on the ecosystem of industrial zones. The practical solution to this problem is the development of effective technologies for the recovery of valuable metals based on a deep study of physicochemical and process properties of waste [3]. Tailing dumps of the Southern Urals mining and processing plants containing more than 100 t of gold and 1200 t of silver unrecovered during primary processing are promising man-made georesources. In terms of gold and silver content, they are comparable with the primary ores, which makes them a competitive mineral raw material. However, comprehensive processing of man-made minerals is complicated by the rebelliousness due to the presence of stable associations of minerals containing finely dispersed gold which, in turn, causes low efficiency of traditional processing methods. The existing technologies for gold and silver recovery are characterized by high cost and duration (autoclave oxidation, bacterial leaching), low process parameters (gravity and flotation concentra
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