Method for utilizing ph control in the recovery of metal and...

C - Chemistry – Metallurgy – 22 – B

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C22B 19/00 (2006.01) B01D 9/00 (2006.01) C22B 7/00 (2006.01) C22B 13/00 (2006.01) C22B 17/00 (2006.01)

Patent

CA 2293687

An improved method for the recovery of metal and/or chemical values from an industrial waste stream containing zinc, cadmium, lead and/or iron compounds by heating the waste stream in a reducing atmosphere, treating the resultant fumes in an ammonium chloride solution, separating any undissolved components from the solution, adjusting the pH of the solution, if necessary, to less than about 6.3, displacing undesired metal ions from the solution using zinc metal, treating the solution to remove therefrom zinc compounds, adjusting the pH of the solution to about 6.5 to about 7.0, and further treating the zinc compounds and the undissolved components, as necessary, resulting in the zinc products and the optional iron-carbon feedstock.

La présente invention concerne un procédé amélioré de récupération de métaux et/ou produits chimiques utiles provenant d'un flux de déchets industriels contenant des composés de zinc, de cadmium, de plomb et/ou de fer, lequel procédé consiste à chauffer le flux de déchets sous une atmosphère réductrice, à traiter les fumées résultantes dans une solution de chlorure d'ammonium, à séparer les éventuels composants non dissous de la solution, à régler, le cas échéant, le pH de la solution à une valeur inférieure à 6,3 environ, à déplacer les ions métalliques indésirables de la solution au moyen de zinc, à traiter la solution pour en retirer les composés de zinc, à régler le pH de la solution à une valeur comprise entre 6,5 environ et 7,0 environ, et à appliquer un traitement supplémentaire aux composés de zinc et aux composants non dissous, selon les besoins, de manière que l'on obtient des produits de zinc et une charge d'alimentation fer-carbone facultative.

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