Process for reducing the dioxin and furan content in waste...

Details Process for reducing the dioxin and furan content in waste... Process for reducing the dioxin and furan content in waste...

B - Operations, Transporting

01

D

B01D 53/46 (2006.01) B01D 53/70 (2006.01) C22B 7/02 (2006.01) C22B 21/00 (2006.01)

Patent

CA 2225654

The invention concerns a process for purifying waste gases from smelting, resmelting or combustion plant furnaces and the use of the filter dusts produced. The invention is used in particular in the production or preparation of nonferrous metals. According to the invention, at least one alkali compound, in particular NaHCO3, is injected dry, optionally in the presence of activated carbon and/or open hearth coke, into the waste gas leaving the production process. The separated filter dust is fed back to the smelting or combustion process. It has unexpectedly been found that the returned filter dust can lower the dioxin and furan contents of the crude gas. Owing to the composition of the filter dust, it can also be used as protective salt in secondary aluminium production.

L'invention concerne un procédé permettant de purifier des gaz brûlés de fours d'installations de fusion, de refusion ou de combustion, ainsi que l'utilisation des poussières de filtrage produites à cette occasion. Cette invention s'utilise notamment pendant la production ou la préparation de métaux non ferreux. Selon l'invention, on injecte à sec au moins un composé alcalin, notamment du NaHCO¿3?, éventuellement en présence de charbon actif et/ou de coke de four Martin, dans les gaz brûlés qui se dégagent du processus de production. La poussière de filtrage produite à cette occasion est renvoyée dans le processus de fusion ou de combustion. Etonnamment, il a été démontré que la poussière de filtrage ainsi renvoyée permettait d'abaisser la teneur en dioxine et en furane dans le gaz brut. La composition de la poussière de filtrage permet également de l'utiliser comme sel de recouvrement pour la production d'aluminium secondaire.

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