A method for reducing the leaching of oxyanion forming...

B - Operations – Transporting – 09 – B

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B09B 3/00 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2430468

In a method for reducing the leaching of oxyanion forming elements, in particular chromium, from materials containing environmentally noxious constituents, especially from incineration residues, especially flue gas cleaning products from waste incineration, in particular fly ash, the said materials are admixed with an aqueous medium such as water in a closed container in a liquid-solid ratio sufficient to cause reducing conditions capable of stabilizing oxyanion forming elements, in particular chromium, due to oxidation of metallic Al, Zn, Fe, and other free metals present in the said materials.

La présente invention concerne un procédé qui permet de réduire la lixiviation des éléments formant des oxyanions, en particulier le chrome, présents dans des matières contenant des constituants nocifs pour l'environnement, en particulier dans des résidus d'incinération, en particulier dans des produits de l'épuration des gaz de combustion provenant de l'incinération des déchets, en particulier dans des cendres volantes, les matières précitées étant mélangées à un milieu aqueux tel que de l'eau dans un conteneur fermé selon un rapport liquide-solide suffisant pour provoquer les conditions de réduction capables de stabiliser les éléments formant les oxyanions, en particulier le chrome, en raison de l'oxydation de l'Al, du Zn, du Fe métalliques et d'autres métaux libres présents dans lesdites matières.

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