Method for treating and upgrading effluents containing...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 9/00 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2406845

The invention concerns a method for treating and upgrading effluents containing at least a metallic sulphate, characterised in that it comprises steps which consist in: adding at least a base to the effluent to precipitate the metallic ions in the form of metallic hydroxides Mea(OH)e; separating the precipitated hydroxide during a step of alkalinization of the rest of the effluent; adding to said effluent calcium hydroxide Ca(OH)2 so as to precipitate hydrated calcium sulphate CaSO4; and separating the calcium sulphate CaSO4 precipitated during the preceding step. Said method enables to obtain calcium sulphate (white gypsum) substantially free of metals and therefore capable of being upgraded and metallic oxy-hydroxides likewise capable of being upgraded.

Procédé de traitement et de revalorisation d'effluents contenant des sulfates métalliques mettant en oeuvre une étape d'addition d'ammoniaque.L'invention concerne un procédé de traitement d'effluents contenant au moins un sulfate métallique caractérisé en ce qu'il comprend les étapes consistant à ajouter au moins une base à l'effluent pour précipiter les ions métalliques sous forme d'hydroxydes métalliques Mea(OH)e, à séparer l'hydroxyde précipité lors de l'étape d'alcalinisation du reste de l'effluent,à ajouter audit effluent de l'hydroxyde de calcium Ca(OH)2 afin d'obtenir une précipitation de sulfate de calcium CaSO4 hydraté, et à séparer le sulfate de calcium CaSO4 précipité lors de l'étape précédente du reste de l'effluent. Ce procédé permet d'obtenir du sulfate de calcium (gypse blanc) essentiellement exempt de métaux et donc valorisable ainsi que des oxy-hydroxydes métalliques également valorisables.

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