Anodic behavior of the NiO-Fe2O3-Cr2O3-Cu composite during the low-temperature electrolysis of aluminum / Kovrov V. A.,Khramov A. P.,Zaikov Yu. P.,Chumarev V. M.,Selivanov E. N. // RUSSIAN JOURNAL OF NON-FERROUS METALS. - 2014. - V. 55, l. 1. - P. 8-14.

ISSN/EISSN:

1067-8212 / 1934-970X

Type:

Article

Abstract:

In order to fabricate oxide-metallic composites with the composition 25.3NiO-41.2Fe(2)O(3)-13.5Cr(2)O(3)-20.0Cu (wt \%), the temperature and duration of sintering (1350A degrees C, 30 min) that ensure the formation of the solid solution of chromium oxide in nickel ferrite have been determined. This material is tested as an anode for the electrolysis of the low-temperature solution with the composition 12.0NaF-36.8KF-51.2AlF(3) (wt \%), which was saturated with Al2O3 (t = 800A degrees C). The amount of gaseous oxygen evolved on the anode was measured. It is shown that the main reaction on an anode at current density i = 0.015-1.0 A cm(-2) is the oxidation of oxygen-containing anions from a melt with the formation of gaseous O-2 and a substantial increase in the oxidation rate of the composite anode is observed at i > 1.0 A cm(-2). The voltage across the electrolyzer (4.5 +/- 0.5 V) and the anodic potential (2.43 +/- 0.2 relative to the Al reference electrode) during a prolonged experiment (for 89 h, i = 0.4 A cm(-2)) indicate a stable and acceptable electrical conductivity of the material, while the dissolution rate, which was calculated by the weight loss (0.6 kg/yr) and volume loss (0.7 cm/yr), satisfy the requirements to inert anodes.

Author keywords:

composite anode; ferronickel spinel; NaF-KF-AlF3 melt; low-temperature electrolysis of aluminum; EPMA INERT ANODES

DOI:

10.3103/S106782121401009X

Web of Science ID:

ISI:000333158200002

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JAN
Publisher	ALLERTON PRESS INC
Address	18 WEST 27TH ST, NEW YORK, NY 10001 USA
Language	English
EISSN	1934-970X
Keywords-Plus	INERT ANODES
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
Author-Email	kovrov@ihte.uran.ru A.Khramov@ihte.uran.ru dir@ihte.uran.ru Chumarev@mail.ru pcmlab@mail.ru
ResearcherID-Numbers	Selivanov, Evgeniy/T-7296-2017 Chumarev, Vladimir/T-9760-2017
Funding-Acknowledgement	Ministry of Education and Science of the Russian Federation {[}14.515.11.0017]
Funding-Text	This study was supported by the Ministry of Education and Science of the Russian Federation, state contract no. 14.515.11.0017, March 14, 2013.
Number-of-Cited-References	22
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	16
Journal-ISO	Russ. J. Non-Ferrous Metals
Doc-Delivery-Number	AD3PM