Physicochemical investigation of anodic processes involved in silver electrowinning in refining technology / Lebed' A. B.,Zaikov Yu. P.,Potapov A. M.,Shpoltakova I. A.,Mal'tsev G. I. // RUSSIAN JOURNAL OF INORGANIC CHEMISTRY. - 2013. - V. 58, l. 4. - P. 427-431.

ISSN/EISSN:

0036-0236 / нет данных

Type:

Article

Abstract:

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 phi(a) a parts per thousand yen 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 phi(a) a parts per thousand 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 Ag7O8NO3. The deposit composition varies in time as a result of reduction of highly oxidized silver.

Author keywords:

нет данных

DOI:

10.1134/S0036023613040098

Web of Science ID:

ISI:000318284000009

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear
Number-of-Cited-References	15
Usage-Count-Last-180-days	4
Usage-Count-Since-2013	17
Journal-ISO	Russ. J. Inorg. Chem.
Doc-Delivery-Number	135JI