Gold Mineral Flotation versus Preparation Conditions of a Complexing Agent Belonging in Dithiazinanes
V. A. CHANTURIA1, T. A. IVANOVA1, I. G. ZIMBOVSKY1, A. A. BONDAREV2, V. L. KOMAROVSKY2
1Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 111020 Russia
2Svyatogor JSC, ul. Kirova 2, Krasnouralsk, 624330 Russia
Keywords: minerals, flotation, gold-bearing ore, adsorption, collecting agents, manual application, gold, complexing, micro– and nanoparticles, electron microscopy
Abstract
Toward efficient and optimized application of agents MTH and ETH, belonging in dithiazinanes, to flotation of gold from complex ores, the actual flotation tests were preceded by the analysis of complexing conditions in water environment and on pyrite surface with manually attached gold (FeS<sub>2</sub>Au). The microscopic and spectral analyses of FeS<sub>2</sub>Au surface after contact with MTH and ETH show organic S– and N–containing agents. It is found that selective gold recovery from gold-bearing material in flotation with MTH and ETH is conditioned by a number of factors that accelerate formation of low solubility compounds on the surface of gold particles. The analysis includes studying duration of mineral and reagent contact, optimal medium alkalinity, formation of oxidized film on the surface of Au<sup>0</sup> particle, introduction of modifying agents that act as additional ligands as well as mechanochemical acceleration of complex formation. Mechanochemical treatment with introduction of low solubility ETH agent in a mill before copper sulfide gold-bearing ore flotation enabled increased gold recovery in the rough flotation concentrate and middlings by 15.9 and 4%, respectively. In this case, Au content in tailings was reduced by 0.15 g/t as against flotation experiments with butyl xanthate and its combination with ETH.
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