National University of Science and Technology “MISiS”, Moscow, Russia:

I. R. Boboev, Junior Researcher (Chair of Non-Ferrous Metals and Gold), e-mail: boboev-i@mail.ru
E. A. Kasatkina, Post-Graduate Student (Chair of Non-Ferrous Metals and Gold), e-mail: NotreLenok@gmail.com
A. V. Ryabova, Master's Degree Student (Chair of Non-Ferrous Metals and Gold)
A. S. Atmadzhidi, Master's Degree Student (Chair of Non-Ferrous Metals and Gold)

Nowadays, materials with high content of impurities, complicating further gold extraction, are often used as the raw materials for Dore bar obtaining. High content of tin in alloy on refining stage complicates the separation of solid and liquid phases after the aqua regia dissolution. Refining of such alloys according to the existing technologies requires their preliminary purification from such impurities as tin and lead. This paper shows the results of investigation of the process of high-tin (to 30% of Sn) gold-bearing alloy leaching by HCl solution for the purpose of selective isolation of tin, lead and copper in products. Dissolution kinetics of these metals-impurities was investigated with various leaching conditions. There was investigated the possibility of intensification of copper leaching process with application of hydroacoustic investigation for solution saturation with oxygen. Application of hydroacoustic irradiators shows the secondary effects, promoting the film destruction on leached material surface, blocking its dissolution. According to this, hydroacoustic processing makes a favourable influence on leaching process, while the dissolution rate increasing is explained by thermomechanical and physicalchemical impact on leached material and reagent. Optimal conditions of each processing stage of the investigated alloy were defined on the basis of the obtained data. Research results offered the process flowsheet, making possible the obtaining of conditioned Dore bar from high-tin gold-bearing alloy and isolation of metals-impurities in particular products.

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