Process for recovering arsenic from acidic aqueous solution

C - Chemistry – Metallurgy – 01 – G

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C01G 28/00 (2006.01) B01D 1/26 (2006.01) C02F 1/02 (2006.01) C02F 1/52 (2006.01) C02F 1/66 (2006.01)

Patent

CA 2431403

A process for the recovery of arsenic trioxide from acid solutions, particularly the aqueous acid effluent produced by a gas-washing process in the pyrometallurgy of copper sulfide ores is provided. Generally, the process comprises concentrating the acid solution in one or more evaporators in series; crystallizing arsenic contained in the concentrated solution as arsenic trioxide crystals; filtering the crystallized solution to obtain a solid phase comprising impure arsenic trioxide crystals; and purifying the solid phase to obtain a purified crystal product comprising arsenic trioxide. The process produces a commercially salable arsenic trioxide product without producing any solid or liquid residues subject to special handling or treatment regulations.

La présente invention concerne un procédé servant à récupérer du trioxyde d'arsenic contenu dans des solutions acides, notamment dans l'effluent acide aqueux produit par un processus de lavage de gaz en pyrométallurgie des minerais de sulfure de cuivre. De manière générale, le procédé comprend les étapes suivantes: concentration de la solution acide dans un ou plusieurs évaporateurs en série; cristallisation de l'arsenic contenu dans la solution concentrée, sous la forme de cristaux de trioxyde d'arsenic; filtrage de la solution cristallisée pour obtenir une phase solide comprenant des cristaux de trioxyde d'arsenic impurs; et purification de la phase solide pour obtenir un produit cristallin purifié comprenant du trioxyde d'arsenic. Le procédé permet d'obtenir un produit de trioxyde d'arsenic pouvant être commercialisé, en ne produisant aucun résidu solide ou liquide faisant l'objet de réglementations spéciales concernant la manipulation ou le traitement.

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