JSC “Aprelevka” Joint Venture, Kansai, Tajikistan:

F. Sh. Boboev, Deputy Chief Engineer

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
L. S. Strizhko, Professor (Chair of Non-Ferrous Metals and Gold), e-mail: sls_2007.47@mail.ru
A. V. Ryabova, Master's Degree Student (Chair of Non-Ferrous Metals and Gold), e-mail: kabysh_av@mail.ru

This paper shows the urgent technological solutions for successful introduction of heap leaching of gold in severe climatic conditions in production. There was considered the experience of work of both Russian and foreign gold mining enterprises. There was made a definition, that heap leaching process is more efficient in the cold period during the thermal insulation of the upper layer of ore pile and heating of cyanide solutions. However, these measures are lowefficient in the conditions of the lack of oxygen, required for the reaction of gold dissolution by cyanide solutions, which leads to the decrease of the rate of gold dissolution in winter. In connection with this, there was defined the necessity of founding of leaching process intensification methods. The successful solving of the set problem offered the intensification of the process of heap leaching by preliminary saturation of alkaline-cyanide solution by oxygen with application of the unit with hydrodynamic transformer. The developed unit promotes the increasing of the concentration of oxygen solution in alkaline-cyanide solutions from 4.2 to 18 mg/l. There was made a definition that industrial introduction of the offered unit as applied to the process of heap leaching in cold climatic conditions may increase the annual volume of the processed raw materials and decrease the process without the change of the existing industrial powers and powers of main and supply equipment.

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