Saint Petersburg, Russia
Saint Petersburg, Russia

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Yamov A.V.,Severalmaz JSC | Kuznetsov I.A.,Polymetal Engineering JSC | Babuk A.V.,Polymetal Engineering JSC
Gornyi Zhurnal | Year: 2014

Lomonosov diamond deposit (Primorskiy Kray (Arkhangelsk Oblast)) includes six pipes, situated at the Western area of Zolotitskoe kimberlite field. "Severalmaz" JSC has been carrying out the development of this deposit since 2005. Since 2010, Lomonosov Ore Dressing and Processing Enterprise has increased the dry ore production of enterprise to 4 mln. t per year. Nowadays, there is finished the construction of the 2 stage of concentration plant with ore preparation technology, similar to the 1 operating stage. Process of ore preparation on the 1 stage of concentration plant is connected with certain problems. One of the basic problems consists in the fact that ore delivery for crushing stage is realized by dump trucks directly on fire grate of receiving bin (crack size is 400 mm). At the same time, in connection with large amount of coarse material and its high clayiness, process of preliminary screening is characterized by low production capacity. This problem is described as more significant on the 2 constructed stage of concentrating plant, which is substantiated by significantly large production capacity by processing of ore and impossibility of application of loading machine, which transporting to the 600 600 mm grid is impossible. There is realized the analysis of capital and exploitation costs on realization of project of reconstruction of concentration plant with introduction of technology of coarse grinding with the purpose of increasing of economic efficiency of project of development of Lomonosov diamond deposit. The proposed technology of coarse crushing of ore made it possible to do the following operations: -increasing of production capacity on initial ore of the whole concentration plant; -increasing of coefficient of use of technological equipment; -creation of conditions for growth of economic efficiency of enterprise's operation in whole.

There were considered the key approaches to resolving of problems, arising in the time of exploitation of Russian and CIS countries gold-mining enterprises, where alkaline cyanide solutions are used. There were compared the international and Russian requirements to neutralization of cyanide wastes of gold-mining industry. International cyanide classification was carried out. Processes of natural detoxification of cyanide compounds in tailings impoundment were considered. There were described the current Russian regulations, relating to purification of waste waters from cyanide ions and thiocyanates which are free and bounded to complex compound with metal ions. Efficiency of purification of cyanide waste waters and possibility of their discharge into water flows have the following determining indices: values of maximum allowable concentrations, dissolved in water; standard of admissible exposure and standard of admissible discharge. This article shows the Russian approach to assessment of hazard of solid wastes, which appear as a result of semi-dry storage of cyanide leaching cakes in complete sludge process, and gold heap leaching. It was noted that it is rather easy to destroy the most toxic free cyanides by a variety of methods, harmless for humans and fauna. However, even after complete destruction of cyanide compounds, dissolved in water, obtained waste waters should be dissolved by pure water or with additional purification measures. The indicators, which most frequently exceed the standard concentrations in de-cyanided water, include pH value, total salt content, products of decomposition of cyanide ions and cyanide destroying reagents, and some by-products of ore and concentrate leaching process which do not contain CN anions. 1. Ritcey G. M. Tailings management: problems and solutions in the mining industry. Amsterdam, New York: Elsevier, 1989. 970 p.

Filyanin G.A.,Polymetal Managing Company JSC | Vorobev-Desyatovskiy N.V.,Polymetal Engineering JSC
Tsvetnye Metally | Year: 2014

This article describes the history of creation of Amursk hydro-metallurgical plant (2012) and its driving up to the project capacity (2013). This plant is the first Russian autoclave enterprise, which processed refractory gold-containing concentrates. There are considered the basic advantages of autoclave oxidation of pyrite and arsenopyrite concentrates, containing "invisible" gold, in comparison with other existing methods of processing of similar materials. There are given the basic parameters of operation of enterprise and its main production stages. There are described the problems, which had to be solved during the pre-commissioning. Nowadays, the enterprise is driven up to the project capacity. This makes possible to process the refractory gold-containing concentrates with productivity of 225 th. t per year and extraction of gold from concentrate into dore bar (94%). At the same time, the reached grade of transformation of sulfur atoms from pyrite and arsenopyrite into sulfuric acid and sulfates is 96-98%, and specific consumption of oxygen for 1 kg of sulfur is 2.3 kg. Concentrate is oxidated in five-section autoclave with useful capacity of 153 m3 at the temperature range of 203-206°C in automatic mode. Oxygen with not lower than 93% frequency is used for oxidation process and obtained in short-cycle adsorption unit from air. In comparison with exis ting foreign analogues, distinctive feature of process flowsheet of Amursk hydrometallurgical plant is presence of closed water circulation, which is reached due to use of purification of reused water in multistage reverse osmosis. Results show the efficiency of this production, which can be the processing center, making possible to process the concentrates of refractory ores of Far Eastern and other closed Russian regions.

Kovalev V.N.,Polymetal Engineering JSC | Muslimov B.A.,Polymetal Engineering JSC | Klepikov A.S.,Polymetal Engineering JSC
Gornyi Zhurnal | Year: 2013

The article deals with problems associated with heap leaching of gold in permafrost zones: calculation of heat-insulating bottom layer of ore stockpile to ensure required negative temperature in underlying subsoil to support the stockpile stability; determination of heat flow for allyear- round leaching; selection of optimal ore fragmentation size. For the heat calculations, a package of programs has been developed for mathematical modeling of an ore stockpile and description of heat exchange between the stockpile and air, heat exchange between the stockpile ore material and leaching solutions and the ice-liquid water phase change. The mathematical models are based on weather data on air temperature, wind velocity and snow cover thickness and the terrestrial radiation balance, as well as use observations over 2007-2011. The authors present the calculated thickness of the required heat-insulating bottom layer of an ore stockpile and various scenarios of heap leaching. The approaches to selecting optimum ore fragmentation size for heap leaching on adverse and remote terrains have been validated based on experimental research of heap leaching of different fragmentation size ore.

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