C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
C23F 1/46 (2006.01) C01G 9/00 (2006.01) C01G 49/14 (2006.01) C22B 3/44 (2006.01) C23G 1/36 (2006.01)
Patent
CA 2214523
The present invention relates to a process for the purification of solutions containing metals comprising neutralization of the solution, reduction of Fe(III) present, and elimination of ingoing dissolved zinc, whereby the ingoing solution containing metals is neutralized using magnetite and/or metallic iron, that the ingoing iron(III) is reduced to iron(II) by means of an addition of metallic iron, that ingoing heavy metals are precipitated by the addition of a precipitating amount of a sulphide, whereby the metal sulphides precipitated are recovered by means of filtration, that the solution is, optionally, subjected to an ion exchange operation to transfer ingoing zinc into non-complex bound form, whereupon zinc is recovered as zinc carbonate, that iron(II) in the remaining solution is oxidized to iron(III), whereupon the solution is used as such or is further treated for increasing the metal content for the purpose intended.
L'invention concerne un procédé de purification de solutions contenant des métaux, qui consiste à neutraliser la solution, à réduire le Fe(III) et à éliminer le zinc dissous entrant, la solution entrante contenant des métaux étant neutralisées à l'aide de magnétite et/ou de fer métallique, à réduire le fer (III) en fer (II) par l'addition de fer métallique, à précipiter les métaux lourds par l'addition d'une quantité précipitée de sulfure. Ainsi, les sulfures de métal précipités sont récupéreés par filtration, et la solution est éventuellement soumise à une opération d'échange d'ions de sorte que le zinc entrant soit transformé en liaison non complexe, le zinc étant récupéré sous forme de carbonate de zinc, le fer (II) dans la solution restante est oxydé et transformé en fer (III), ladite solution étant utilisée telle quelle ou encore traitée de sorte que la teneur en métaux soit augmentée selon le but recherché.
Fetherstonhaugh & Co.
Kemira Kemi Aktiebolag
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