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Metals 2017, 7(3), 79; doi:10.3390/met7030079

Application of Boron Oxide as a Protective Surface Treatment to Decrease the Air Reactivity of Carbon Anodes

1
Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec City, QC G1V 0A6, Canada
2
NSERC/Alcoa Industrial Research Chair MACE3 and Aluminum Research Centre—REGAL, Laval University, Quebec City, QC G1V 0A6, Canada
3
Alcoa Primary Metals, Alcoa Technical Center, 100 Technical Drive, Alcoa Center, New Kensington, PA 15069-0001, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 18 January 2017 / Revised: 13 February 2017 / Accepted: 28 February 2017 / Published: 3 March 2017
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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. View Full-Text
Keywords: anode air reactivity; boron oxide anode coating; anode impregnation coating; anode sample gasification; computed tomography (CT) anode air reactivity; boron oxide anode coating; anode impregnation coating; anode sample gasification; computed tomography (CT)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ishak, R.; Picard, D.; Laroche, G.; Ziegler, D.P.; Alamdari, H. Application of Boron Oxide as a Protective Surface Treatment to Decrease the Air Reactivity of Carbon Anodes. Metals 2017, 7, 79.

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