Application of boron oxide as a protective surface treatment to decrease the air reactivity of carbon anodes

Authors: Ishak, RamziPicard, DonaldLaroche, GaétanZiegler, Donald PaulDarvishi Alamdari, Houshang
Abstract: The oxidation of a carbon anode with air and CO2 occurs during the electrolysis of alumina in Hall-Héroult cells, resulting in a significant overconsumption of carbon and dusting. Boron is well known to decrease the rate of this reaction for graphite. In this work, the application of boron oxide has been investigated to evaluate its inhibition effect on the air oxidation reaction, and to provide an effective protection for anodes. Different methods of impregnation coating have been explored. Impregnated anode samples were gasified under air at 525 C according to the standard measurement methods. X-ray tomography was used to obtain the microstructural information of the samples before and after air-burning tests. The impregnated samples showed a very low oxidation reaction rate and dust generation.
Document Type: Article de recherche
Issue Date: 3 March 2017
Open Access Date: 23 July 2019
Document version: AM
This document was published in: Metals, Vol. 7 (3), 1-15 (2017)
Alternative version: 10.3390/met7030079
Collection:Articles publiés dans des revues avec comité de lecture

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