Method of processing copper arsenic compound

C - Chemistry – Metallurgy – 01 – G

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C01G 28/00 (2006.01) B01D 9/02 (2006.01) C02F 1/70 (2006.01) C02F 1/72 (2006.01) C22B 3/44 (2006.01) C22B 7/00 (2006.01) C22B 30/04 (2006.01)

Patent

CA 2694792

Provided is a method of easily producing scorodite which is stable and has excellent filtering properties with excellent reproducibility and without using complex operations, when processing arsenic that is included in non-ferrous smelting intermediates, and particularly when processing copper arsenic compounds in the form of an intermetallic compound. Scorodite is produced by a leaching step of leaching arsenic from a non-ferrous melting intermediate containing a copper arsenic compound in the form of an intermetallic compound in the presence of a sulfidizing agent and an oxidizing agent, a solution adjusting step of oxidizing trivalent arsenic to pentavalent arsenic by adding the oxidizing agent to the leaching solution, and a crystallizing step of converting the arsenic in the adjusted solution to scorodite crystals.

L'invention concerne un procédé de traitement de l'arsenic contenu dans un produit intermédiaire de fusion non ferreux, en particulier un procédé de traitement de composés de cuivre-arsenic sous la forme d'un composé intermétallique, lequel produit de la scorodite stable qui excelle en termes d'aptitude à la filtration facile sans opération lourde avec une reproductibilité élevée. Ledit procédé de production de scorodite comprend : une étape de lixiviation consistant à lixivier l'arsenic en présence d'un agent de sulfuration et d'un agent oxydant à partir d'un produit intermédiaire de fusion non ferreux contenant des composés de cuivre-arsenic sous la forme d'un composé intermétallique ; une étape d'ajustement du liquide consistant à ajouter un agent oxydant au lixiviat pour effectuer de cette manière une oxydation de l'arsenic trivalent en arsenic pentavalent ; et une étape de cristallisation consistant à convertir l'arsenic contenu dans le liquide ajusté en cristaux de scorodite.

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