Preparation of zinc chemicals from the minor flow of a process

Details Preparation of zinc chemicals from the minor flow of a process Preparation of zinc chemicals from the minor flow of a process

C - Chemistry, Metallurgy

22

B

C22B 19/20 (2006.01) C22B 3/00 (2006.01) C25C 1/16 (2006.01)

Patent

CA 2577863

The invention is a novel process arrangement for producing pure zinc chemicals from the minor flow of a calcining-dissolving-electrolysis type of a preparation process of zinc. The invention is based on the fact that part of the production of the zinc sulphate-containing solution obtained from the dissolution of the calcining-dissolving-electrolysis plant is directed to the preparation of zinc chemicals. The actual recovery process of zinc, which is based on electrolysis, is not disturbed, as only part of the production of the zinc sulphate solution is directed to the preparation of zinc chemicals. The extraction process is based on the use of any organically substituted phosphoric acid or organically substituted thiophosphinic acid. The strong acid solution, which is generated as a by-product in the extraction process of zinc, is recycled back to the calcining-dissolving-electrolysis type of a preparation process of zinc.

L'invention concerne un nouveau procédé permettant de produire des produits chimiques purs à base de zinc à partir du flux secondaire d'un procédé de préparation de zinc du type électrolyse de calcination-dissolution. L'invention concerne le fait qu'une partie de la production de la solution contenant du sulfate de zinc obtenue à partir de la dissolution du matériel d'électrolyse de calcination-dissolution est dirigée vers la préparation de produits chimiques à base de zinc. Le procédé de récupération effectif du zinc, qui est fondé sur l'électrolyse, n'est pas perturbé, car une partie seulement de la production de la solution de sulfate de zinc est dirigée vers la préparation de produits chimiques à base de zinc. Le procédé d'extraction se fonde sur l'utilisation de tout acide phosphorique substitué de manière organique ou de tout acide thiophosphinique substitué de manière organique. La solution d'acide fort, obtenue comme sous-produit du procédé d'extraction du zinc, est recyclé vers le procédé de préparation de zinc du type électrolyse de calcination-dissolution.

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