Method and device for recycling metal pickling baths

Details Method and device for recycling metal pickling baths Method and device for recycling metal pickling baths

C - Chemistry, Metallurgy

23

G

C23G 1/36 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2492183

The invention relates to a method for recycling metal pickling baths, including rinsing baths and air washers. Said method is characterised in that a) before the recycling process, free acids in the liquid waste flows to be treated are converted into a metallic salt form, b) water is separated from the largely acid-free metallic salt solution produced in order to obtain a concentrated metal salt solution, and c) the concentrated metal salt solution is subjected to a thermal method in order to obtain metal oxides and free acids. The invention also relates to a corresponding device. The inventive method and device enable the degree of acid recovery and also the production of metal oxides to be significantly increased, with lower operating costs.

L'invention concerne un procédé et un dispositif pour recycler des bains de décapage de métaux, y compris les bains de rinçage associés et les bains provenant d'installations de lavage d'effluents. Ledit dispositif est caractérisé par les étapes suivantes: a) conversion des acides libres présents dans les flux de déchets liquides à traiter, avant le recyclage, en sels métalliques; b) séparation de l'eau et de la solution de sels métalliques obtenue, largement exempte d'acide, pour permettre l'obtention d'une solution de sels métalliques concentrée; c) traitement thermique de la solution de sels métalliques concentrée pour permettre l'obtention d'oxydes métalliques et d'acides libres. L'invention concerne également un dispositif pour la mise en oeuvre dudit procédé. Ledit dispositif et ledit procédé permettent d'augmenter considérablement le degré de recyclage d'acide et la récupération d'oxydes métalliques tout en réduisant les coûts d'exploitation.

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