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Ryaboy V.I.,Mekhanobr Orgsintez Reagent CJSC | Shepeta Y.D.,Russian Academy of Sciences | Kretov V.P.,Kvadrat plyus CJSC | Golikov V.V.,JSC Polymetal Engineering
Obogashchenie Rud | Year: 2014

BTF-1522, -1552, -163, -175 reagents-collectors and their certain analogues were synthesized and tested. Effects of their surface-active prop- erties and hydrophobization ability upon flotation activity were studied. All reagents contained sodium dialkyldithiophosphates as one of their main components. Surface activity of the reagents' 1% water solution at liquid-gas interface (l-g) was determined by stalagmometric method with respect to all tested reagents, and regarding BTF-163, -1552, -152 reagents, surface tension of their water solutions was also determined as a function of concentration. Hydrophobization ability was estimated mostly qualitatively. It is shown, that in the range of the studied reagents, a stronger collector is characterized by a higher surface activity, and, correspondingly, a more selective collector - by a lower sur- face activity at liquid-gas interface. On the ground of this dependence, BTF-1522 is proposed to be applied in copper-zinc ore flotation as selective collector, BTF-1552 - in silver-bearing ores flotation, BTF-1532 - in copper-nickel ore flotation. BTF-163 is the strongest collector in copper and gold-bearing ores flotation. BTF-1522 and -163 reagents were brought into commercial practice.

This article describes the methods of reduction of reagents' toxic impact on environment at gold processing plants, utilizing ultra-fine grinding with gold cyanide dissolution. In cases where such operation includes a downstream tailings facility with water recycling, the most practical solution is complete and (or) partial recycling of cyanide. Another environmentally promising method is semi-dry disposal of cyanidation cake. There are also described physical and chemical processes, carried out with cyanide compounds experience in liquid tailing dump phase, depending on pH values and temperature. Advantages and drawbacks of reverse osmosis for treatment of discharge cyanide solutions are shown together with issues, associated with that method. There are also reviewed the major methods, used for cyanide recovery from waste solutions (AVR, Golconda, Cyanisorb), as well as technologies, applied in treatment of cyanide solutions, containing high concentrations of Cu (I) (SART, NMR) and their varieties.

The article describes non-oxidation methods of detoxication of cyanide solutions and slurries, based on binding of cyanide ions into insoluble or relatively low-toxic strong compounds. Such technologies include precipitation of CN- anion in the form of low solubility compounds, such as ferric ferrocyanide/Turnbull's blue, Fe4[Fe(CN)6]3, FeNa[Fe(CN)6], or binding of this anion with thyocyanate anion, interacting with polysulfide compounds (DTOX technology). Both considered methods do not provide the results, corresponding to existing Russian environmental regulations. Using ion-exchange resin (anion resin), cyanide solution detoxication method helps to reduce the environmental impact, but can not solve all issues. Its industrial application requires significant dilution of waste solutions with fresh water, following their treatment by ion-exchange resin, which is not always possible. The article also describes the latest developments in oxidation of cyanide ions by atmospheric oxygen on activated carbon as catalyst. Nowadays, this method is not commercially used, but it can become a prospective development in future. © Designed by: "Ore and Metals" Publishing House.

Aleksandrova T.N.,National Mineral Resources University | Tsiplakov V.N.,JSC Polymetal Engineering | Romashev A.O.,National Mineral Resources University | Semenikhin D.N.,National Mineral Resources University
Obogashchenie Rud | Year: 2015

The results of the Mayskoye deposit difficultly-treated gold sulfide ore mineralogical-technological studies are presented, the deposit being one of the five Russian largest gold reserves. The ore is characterized by presence of finely-disseminated gold in crystalline lattice of sulfides (arsenopyrite, pyrrhotine) and persulphide (pyrite), as well as natural sorption-active ore carboniferous components. In order to decrease pregrobbing effect in subsequent processing of concentrates, a possible decrease of ore carboniferous components content was studied by means of flotation, gravity-flotation and flotation-gravity methods at concentration stage. It is shown, that removal of ore carboniferous components from concentrate at the stage of concentration by flotation and gravity methods may provide for decrease in gold losses at subsequent stages of concentrates processing. It is also shown that depression of ore carboniferous components at the head of flotation process promotes increase in quantitative ratio of gold and carbon in concentrate, required for successful subsequent processing of concentrate. Application of a combination flotation-gravity flow sheet with centrifugal separation is most promising for the type of ores in question, providing for production of concentrate, suitable for successful processing by pressure oxidation technology with subsequent sorption cyanidation.

Domanskii I.V.,Saint Petersburg State University | Mil'chenko A.I.,JSC Polymetal Engineering | Vorob'ev-Desyatovskii N.V.,JSC Polymetal Engineering
Chemical Engineering Science | Year: 2011

An one-dimensional mathematical model addressing the field of tangential velocities, agitation power and other hydrodynamic features necessary for designing large-size unbaffled agitators with a precession impeller is proposed in this study. The adequacy of the model is confirmed by tests, published data, and lengthy positive operational results for industrial agitators with a volume of up to 1000m 3, designed for leaching of ore slurries. © 2011 Elsevier Ltd.

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