Method for removing mercury from gas

Details Method for removing mercury from gas Method for removing mercury from gas

B - Operations, Transporting

01

D

B01D 53/64 (2006.01) C01B 17/56 (2006.01) C01B 19/00 (2006.01)

Patent

CA 2429837

The invention relates to a method for the removal of mercury from gas containing sulphur dioxide and oxygen and from the sulphuric acid vapour contained in the gas. According to the method, the gas is washed with a water solution that contains selenium ions, whereby metallic selenium is formed in the presence of oxygen, which precipitates the mercury in the gas and vapour either as a selenide or in a chlorine-containing environment, as a dichloride of mercury and selenium. Gas washing occurs at a low temperature, below 50 ~C.

L'invention concerne un procédé d'extraction de mercure à partir d'un gaz contenant du dioxyde de soufre et de l'oxygène et à partir de la vapeur d'acide de soufre contenue dans le gaz. Selon l'invention, ce gaz est lavé avec une solution aqueuse à base d'ions de sélénium (du sélénium métallique étant formé en présence d'oxygène) qui fait précipiter le mercure contenu dans le gaz et la vapeur soit comme séléniure soit comme dichlorure de mercure et sélénium dans un environnement contenant du chlore. Le lavage de gaz se fait à basse température (- 50 C).

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