A method for the treatment, in particular stabilization, of...

B - Operations – Transporting – 09 – B

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B09B 3/00 (2006.01) B09C 1/08 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2264181

In a method for the treatment, in particular stabilization, of materials containing environmentally noxious constituents, especially from the incineration of waste, in which the materials are treated with ferrous compounds and water, the materials are washed and stabilized chemically using a solution containing ferrous ions (Fe++) which allows the formation of stabilizing ferric oxides (Fe+++) on the materials, the ferric oxide formation being carried out by means of an oxidation under controlled conditions with respect to the nature and the amount of oxidizing agent, temperature and pH, whereafter, if desired, the treated materials are subjected to a thermal after-treatment. A plant for carrying out the said method comprises a silo (2) containing materials containing environmentally noxious constituents; a reactor (1) to which the said materials ar fed; a tank (9) and a return water tank (7) and silos (3, 4) containing ferrous salt solution and, if desired, other chemicals, washing-water and the said chemicals being fed to the said reactor (1), the reactor contents being stirred; a sedimentation tank (5) to which the washing-water is fed; a centrifuge or filter press (6) in which the precipitate formed is dewatered; and means for aerating the water in the said tank (5) for decreasing the pH and oxidation of the water.

Ce procédé de traitement, notamment de stabilisation, de matériaux contenant des constituants nocifs pour l'environnement et provenant essentiellement de l'incinération de déchets, consiste à traiter ces matériaux à l'aide de composés ferreux et d'eau, à laver les matériaux et à les stabiliser chimiquement au moyen d'une solution contenant des ions ferreux (Fe<++>), ce qui permet la formation d'oxydes ferriques stabilisateurs (Fe<+++>) sur ces matériaux, cette formation s'effectuant au moyen d'une oxydation exécutée dans des conditions régulées quant au respect de la nature, à la quantité d'agent d'oxydation, à la température et au pH, après quoi, si on le souhaite, on soumet les matériaux traités à un traitement thermique ultérieur. L'installation destinée à mettre en oeuvre ce procédé comprend un silo (2) contenant des matériaux renfermant des constituants nocifs pour l'environnement, un réacteur (1) vers lequel les matériaux sont fournis, un bassin (9), un réservoir d'eau de retour (7) et des silos (3, 4) contenant la solution de sel ferreux et, le cas échéant, d'autres produits chimiques, l'eau de lavage et ces produits chimiques étant dirigés vers le réacteur (1) dont le contenu est brassé, un bassin de sédimentation (5) recevant l'eau de lavage, une centrifugeuse ou un filtre presse (6) dans lequel le précipité formé est déshydraté, ainsi que des moyens d'aération de l'eau dans le bassin (5), afin d'abaisser le pH et l'oxydation de celle-ci.

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