Hydrometallurgical method for the reuse of secondary zinc...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 19/20 (2006.01) C22B 3/08 (2006.01) C22B 3/44 (2006.01) C22B 3/46 (2006.01) C22B 7/02 (2006.01) C22B 19/28 (2006.01) C22B 19/30 (2006.01)

Patent

CA 2744941

The present invention relates to a method for eliminating halides, in particular chlorides and fluorides, from secondary zinc oxides, for example Waelz or Primus oxides, including the steps of (1) stripping the secondary zinc oxides with sodium carbonate and separating the dry matter from the base liquid, (2) leaching at least one portion of the dry matter from step 1 using H2SO4, preferably until reaching a pH of 2.5 to 4, and separating the dry matter from the acid liquid, and (3) treating the liquid from step 2 by adding Al3+ ions and PO4 3- ions and a neutralising agent in order to eliminate the residual fluoride, preferably until reaching a pH of < 4, and separating the liquid from the dry matter containing the fluorides.

La présente invention propose un procédé d'élimination d'halogénures, en particulier de chlorures et de fluorures, au départ d'oxydes de zinc secondaires, par exemple des oxydes Waelz ou Primus, comprenant les étapes de (1) lavage des oxydes de zinc secondaires avec du carbonate de sodium et séparation du résidu solide du liquide basique, (2) lixiviation d'au moins une partie du résidu solide de l'étape 1 au moyen de H2SO4, de préférence jusqu'à un pH entre 2,5 et 4, et séparation du résidu solide du liquide acide, et (3) traitement du liquide de l'étape 2 par ajout d'ions A1 3+ et d'ions PO4 3- et d'un agent neutralisant afin d'éliminer le fluorure résiduel, de préférence à un pH < 4, et séparation du liquide du résidu solide contenant les fluorures.

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