“Norilsk Nickel” MMC, Moscow, Russia

M. N. Naftal, Head of a Technical Department, e-mail: naftalmn@nornik.ru

Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekaterinburg, Russia
S. S. Naboychenko, President

Polar Division of “Norilsk Nickel” MMC, Norilsk, Russia
R. Yu. Sharkiy, Head of a Shop (“Nadezhda Metallurgical Plant”)
A. F. Petrov, Head of Laboratory (Center of Engineering Maintenance of Production)
N. A. Lapshina, Chief Specialist (Center of Engineering Maintenance of Production)

It is shown, that efficiency of autoclave hydrometallurgical technology of processing of Norilsk nickel-pyrrhotine concentrates can mostly be defined by the level of purposeful extraction of platinum group metals. At the same time, the mechanism of formation of losses is individual for each metal. The mechanism can be defined by the form of its occurrence in initial concentrate. Prospective direction of improvement of this technology is the application of combined surface-active substance in operation of autoclave-oxidation leaching. This substance consists of two or more components, which have technological “antagonism”, concerning the influence on the stability of water-sulphur emulsions. Regulation depth of decomposition of pyrrhotine (≥96%) is provided due to the variation of the common costs of surface-active substance and regulation of the ratio of ingredients. There is also simultaneously provided the high extraction of precious metals into autoclave sulphide concentrate, due to intensification of collecting action of melted elemental sulfur. The following industrial methods are recommended for the combined surface-active substance:
— binary system of reagents, which consists of lignosulphonates and high-molecular oil adsorption resins with more than 25 carbon atoms in molecule in average;
— content of lignosulphonates and oil-soluble sulfonate additives, for example DP-4 (ДП-4) and DP-4 SM (ДП-4 СМ). Combined surface-active substance (lignosulphonate + DP-4 SM) is introduced in operation of autoclave-oxidation leaching at “Nadezhda” Metallurgical Plant. According to the data of industrial testings, in the time of introduction of this surface-active substance, increasing of annual production of metals into autoclave sulfide concentrate, due to the decreasing of their irretrievable losses with tailings of technology, makes up 450–600 kg of amount of platinum group metals and 300–400 t of Ni. The expected economic effect from realization of this technical development, calculated in the prices of 2011, is ~0.5 bln. rub/year.

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