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Combustion of petroleum coke dust as a partial substitute for natural gas and oil in the alumina trihydrate calcination process

Desgroseillers B., Perron Jean, Laurin P., Ménard O. et Martin J.. Combustion of petroleum coke dust as a partial substitute for natural gas and oil in the alumina trihydrate calcination process. Dans : Light Metals 1996: Proceedings of the Technical Sessions Presented by the Tms Light Metals Committee at the 125th Tms Annual Meeting , February 4-8 1996, Anaheim, California.

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In the Saguenay region, Alcan operates two coke calcination rotary kilns to supply with calcined coke its prebaked anode and Soderberg paste smelters. The annual production is approximately 220 000 t of calcined coke. For the last few years, the unwanted emissions of under calcined coke dust (UCCD) emitted from the kilns along with the hot gas reaches approximately 16 000 t per year. A maximum of 6 000 t of UCCD are recycled in fabrication processes. In the search of new possibilities to recycle and sell the remaining 10 000 t the possibility of using this UCCD as a heating source in other processes has emerged, particularly for the calcination of alumina trihydrate. A feasibility study on the combustion as well as a plant trial showed the benefits of burning this UCCD in two 60 t/h capacity calcination units. In fact, appreciable savings in natural gas or oil, as well as increased energetic efficiency (gain of 6%) were observed in the calcination units. Furthermore, the impact on quality of the metallurgical alumina is negligible. These results can be explained partly by the use of a solid combustible which presents longer combustion time compared to natural gas. The combustion zones are therefore extended, favoring the heat transfer to the solid during calcination.

Type de document:Matériel de conférence (Non spécifié)
Sujets:Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:Calcination de trihydrate d'alumine
Déposé le:22 janv. 2016 01:23
Dernière modification:06 mars 2018 02:35
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