Process for preparing environmentally stable products by the...

B - Operations – Transporting – 09 – C

Patent

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B09C 1/06 (2006.01) A62D 3/32 (2007.01) A62D 3/38 (2007.01) B09B 3/00 (2006.01) B09C 1/08 (2006.01) C03B 5/00 (2006.01) C04B 7/24 (2006.01) C04B 18/10 (2006.01)

Patent

CA 2276020

This invention relates to remediation and decontamination of sediments and soils contaminated with organic and inorganic contaminants. Environmentally stable products are produced when certain additives such as calcium oxides are mixed with the contaminated materials. In the process, the mixture is heated to produce a molten reaction product with at least part of an excess amount of oxygen mixture or air continuously bubbled through the melt (16) in order to provide mixing and achieve high thermal destruction and removal efficiencies of the organic contaminants. The melt (16) is then quickly quenched in moist air, steam or water to avoid the transformation of the amorphous material into crystals. The inorganic contaminants such as chromium, nickel and zinc are incorporated and completely immobilized within the amorphous silicate network. The amorphous material can be pulverized to yield a powder which evinces cementitious properties by blending it with other materials to produce blended cements.

L'invention concerne des mesures de correction et de décontamination destinées aux sédiments et aux sols contaminés par des contaminants organiques et inorganiques. On obtient des produits stables vis-à-vis de l'environnement en mélangeant avec les matériaux contaminés certains additifs tels que de la chaux vive. Selon le procédé, on chauffe le mélange de façon à obtenir un produit de réaction fondu (16), dans lequel on envoie en continu des bulles constituées d'au moins une partie de l'excédent d'un mélange d'oxygène ou d'air, ce qui permet de mélanger les contaminants organiques, ainsi que de les détruire thermiquement et de les éliminer avec un rendement élevé. Puis on trempe rapidement le produit fondu (16) dans de l'air humide, de la vapeur ou de l'eau, de façon à éviter la cristallisation du matériau amorphe. Les contaminants inorganiques tels que le chrome, le nickel et le zinc sont incorporés et complètement immobilisés à l'intérieur du réseau de silicate amorphe. On peut réduire en poudre le matériau amorphe, ce qui permet d'obtenir une poudre qui possède des propriétés cimentaires quand on la mélange avec d'autres matériaux afin de produire des ciments mixtes.

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