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Ivanovich M.V.,Gipronickel Institute | Ilyich R.V.,Mekhanobr Orgsintez Reagent JSC | Valentinovna K.Y.,Gipronickel Institute
Obogashchenie Rud

Instead of butyl aerofloat, its modification - BTF-161SK, being a more effective reagent, is proposed for application on account of current involvement of the difficultly-treated and complex Zhdanovskoye deposit cupreous ores in processing and decrease in metals recovery in flotation concentration, mostly due to worsening of frothing in cleaning operations. Reagent BTF-161SK, in contrast to butyl aerofloat, possesses good frothing properties, also in cleaning operations, providing for metals recovery and flotation process rate increase. Conditions of aerofloat dosing into the process were studied. It is shown, that maximum recovery of nickel and copper is achieved with aerofloat addition directly into flotation cell without pre-agitation, when aerofloat ability to oxidize disulfide is decreased. Disulfide, as an oily product, with aerofloat application may promote froth suppression in cleaning operations, and in this connection reagent BTF-161SK ability to form disulfide is reduced. The results of BTF-161SK testing on rougher flotation feed with use of return water under the concentrating plant laboratory conditions are presented. It is noted, that the reagent is ready for commercial application. Source

Galaov R.B.,Norilsk Nickel | Nagovitsyn Yu.N.,Norilsk Nickel | Pliev B.Z.,Norilsk Nickel | Andreev A.A.,Inter Industry Scientific Center | Vil'chinsky V.B.,Gipronickel Institute
Gornyi Zhurnal

Polar Division of the Norilsk Nickel Mining and Metallurgical Company extracts ore from the rockburst-hazardous Oktyabrsky and Taimyrsky copper-nickel ore deposits. Mining is carried out at great depths from 650 to 1400 m below surface, with concurrent extraction of all types of ore (massive rich, disseminated and cuprous), which predetermines severe conditions of excavation support. Aside from the complicated mine-technical situation, the underground excavation stability is affected by the following factors: • mature jointing represented by 3-4 systems of variously oriented joints governing the pronounced blocky structure; • extremely intense jointing in the zones of tectonic faulting and at the faulting boundaries; • weakening of surfaces of joints by serpentine, chlorite and other minerals that reduce cohesion over the surfaces, especially when water penetrates to the joints from the mine due to natural or induced water inflows. In the given mine-technical and mining-and-geological conditions reckoned among extremely difficult, conventional types of support and support technologies available for deep excavations frequently appear low-effective. The article highlights main trends and results of the pilot projects on reengineering of underground excavation support types and technologies for deep mines in the extremely complicated mining-and-geological and rockburst-hazardous conditions. Source

The technique of qualitative thermal analysis is described by the example of the study of a Cu-Ni binary system. The main parameters affecting the results of determination of phase transformation temperatures are listed. Recommendations are given for choosing experimental conditions for determining the liquidus and solidus temperatures of multicomponent systems. Techniques for processing the results of differential thermal analysis are presented. © 2010 Pleiades Publishing, Ltd. Source

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