Process for removing selenium and mercury from aqueous...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/90 (2006.01) B01D 53/73 (2006.01) C01B 17/52 (2006.01) C01B 17/56 (2006.01) C01B 19/00 (2006.01) C02F 1/52 (2006.01) C02F 1/66 (2006.01)

Patent

CA 2412393

The present invention relates to an apparatus for removing volatile impurities such as mercury and selenium from a weak acid solution resulting from scrubbing gases created in the production of sulfuric acid by roasting of sulfide concentrates. The apparatus comprises a calcine filtering unit for removing calcine from the weak acid solution, a sodium sulfide mixing unit for precipitating mercury from the weak acid solution, a sodium dithionite mixing unit for precipitating selenium from the weak acid solution, and a mercury- selenium filtering unit for filtering the precipitated mercury and selenium from the weak acid solution. The present invention further relates to a treatment plant utilizing such an apparatus, a process for removing volatile impurities from a weak acid solution, and a selenium cake obtained by utilizing the present invention.

La présente invention concerne un appareil permettant d'extraire des impuretés volatiles telles que du mercure et du sélénium d'une solution d'acide faible résultant du lavage des gaz générés lors de la production d'acide sulfurique par grillage de concentrés de sulfure. Cet appareil comprend une unité de filtrage de calcinat permettant d'extraire le calcinat de la solution d'acide faible, une unité de mélange de sulfure de sodium permettant de précipiter le mercure à partir de la solution d'acide faible, une unité de mélange de dithionite de sodium permettant de précipiter le sélénium à partir de la solution d'acide faible, et une unité de filtrage du mercure-sélénium permettant de filtrer le mercure et le sélénium précipités à partir de la solution d'acide faible. La présente invention concerne également une station de traitement utilisant un tel appareil, un procédé permettant d'extraire les impuretés volatiles de la solution d'acide faible, ainsi qu'un pain de sélénium obtenu en utilisant l'appareil décrit dans la présente invention.

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