Method of processing non-ferrous smelting intermediates...

C - Chemistry – Metallurgy – 01 – G

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C01G 28/00 (2006.01) B09B 3/00 (2006.01) C22B 3/44 (2006.01) C22B 7/00 (2006.01) C22B 15/00 (2006.01) C22B 30/02 (2006.01)

Patent

CA 2707387

To extract arsenic from smelting intermediates containing arsenic, to outside the system in stable form. A method of processing non-ferrous smelting intermediates containing arsenic comprises: a leaching step of performing oxidation leaching of a mixture slurry in the acidic region to obtain a leaching solution, the mixture slurry being a mixture of a non-ferrous smelting intermediate containing arsenic in sulfide form and a non-ferrous smelting intermediate containing arsenic and copper as metal; a solution adjusting step of adding an oxidation agent to the leaching solution to oxidize trivalent arsenic to pentavalent arsenic and obtain an adjusted solution; and a crystallizing step of converting arsenic in the adjusted solution to scorodite crystals.

L'objectif est de retirer de l'arsenic dans une forme stable à partir d'un produit intermédiaire de fusion contenant de l'arsenic. Ainsi, l'invention porte sur un procédé de traitement d'un produit intermédiaire de fusion non ferreux contenant de l'arsenic qui comprend : une étape de lixiviation consistant à soumettre une bouillie mixte de produit intermédiaire de fusion non ferreux contenant de l'arsenic sous la forme d'un sulfure et un produit intermédiaire de fusion non ferreux contenant de l'arsenic et du cuivre métal à l'oxydation/lixiviation dans une plage acide pour produire une solution de lixiviation ; une étape de préparation de solution, consistant à ajouter un agent oxydant à la solution de lixiviation pour oxyder de l'arsenic trivalent en arsenic pentavalent, permettant ainsi de produire une solution de préparation ; et une étape de cristallisation, consistant à convertir de l'arsenic contenu dans la solution de préparation en un cristal de scorodite.

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