Yekaterinburg, Russia
Yekaterinburg, Russia

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Lebed' A.B.,OAO Uralelectromed | Zaikov Yu.P.,Ural Federal University | Potapov A.M.,Ural Federal University | Shpoltakova I.A.,OAO Uralelectromed | Mal'Tsev G.I.,OAO Uralelectromed
Russian Journal of Inorganic Chemistry | Year: 2013

During silver electrowinning in refining technology, irrespectively of the nature of electrolyte and anode material, an anode deposit is formed due to oxidation of singly charged silver ions to higher degrees of oxidation (+2 and +3) under polarization. Absorption spectra of Ag(II) have been obtained in solutions with various concentrations of silver ions and nitric acid using anodic polarization in combination with electronic absorption spectroscopy; silver ions of high oxidation degrees were found to be unstable in solutions. At anode potentials φa ≥ 1.15-1.22 V, Ag(I) ions in liquid phase are oxidized to Ag(II), which paint the anolyte; their content depends on silver and nitric acid concentrations in the electrolyte. The deposit crystallizes on anode at potential φa ≈ 1.5 V. Chemical analysis, X-ray powder diffraction, and a thermogravimetric study of the anode deposit have made it possible to identify its initial composition as Ag 7O8NO3. The deposit composition varies in time as a result of reduction of highly oxidized silver. © 2013 Pleiades Publishing, Ltd.

Lebed' A.B.,OAO Uralelectromed | Krayukhin S.A.,OAO Uralelectromed | Naboichenko S.S.,Ural Federal University | Mal'tsev G.I.,OAO Uralelectromed
Russian Journal of Non-Ferrous Metals | Year: 2012

Complex forms of palladium that are formed in ammonia-nitrate solutions during the desorption of platinum group metals (PGMs) from the VP-1P anionite are investigated. The possibility in principle of using the latter for the removal of PGMs from electrolytes in the refining technology of silver is confirmed. © 2012 Allerton Press, Inc.

Khrennikov A.A.,OAO Uralelectromed | Vasil'ev E.A.,OAO Uralelectromed | Lebed' A.B.,OAO Uralelectromed | Naboichenko S.S.,Ural Federal University
Russian Journal of Non-Ferrous Metals | Year: 2010

The exchange interaction of indium and zinc sulfides with an arsenite ion in a sulfuric-acid medium is investigated under laboratory conditions. Based on the regularities that are revealed, a method for the additional recovery of In and Zn from the industrial sulfide cake obtained during the removal of arsenic from the indium-containing solutions is suggested. © 2010 Allerton Press, Inc.

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