Process for removing sulfur dioxide from flue gases

B - Operations – Transporting – 01 – D

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23/104, 23/349

B01D 53/50 (2006.01) B01D 53/80 (2006.01) C01F 5/22 (2006.01) C01F 11/46 (2006.01)

Patent

CA 2032425

A process for removing sulfur dioxide from a flue gas in a wet scrubber with an aqueous slurry formed from calcium hydroxide and magnesium hydroxide with magnesium hydroxide or magnesium oxide recovered therefrom. A thickened sludge from a thickener containing calcium sulfite solids is separated and an aqueous sulfite solution removed, with a first portion of the solution returned to the thickener while a second portion thereof is oxidized to form a sulfate solution. Lime is added to the sulfate solution to precipitate calcium sulfate and form an aqueous magnesium hydroxide suspension, with the precipitated calcium sulfate separated from the magnesium hydroxide suspension which may be dewatered to form a magnesium hydroxide product or calcined to produce magnesium oxide.

Un procédé pour retirer le dioxyde de soufre d'un gaz de combustion dans un laveur de gaz par voie humide à l'aide d'une suspension aqueuse formée d'hydroxyde de calcium et d'hydroxyde de magnésium avec récupération de l'hydroxyde de magnésium ou d'oxyde de magnésium. Une boue épaissie d'un épaississeur contenant des solides de sulfite de calcium est séparée et une solution aqueuse de sulfite est retirée; une première partie de la solution est retournée dans l'épaississeur alors qu'une seconde partie de la solution est oxydée pour former une solution de sulfate. De la chaux est ajoutée à la solution de sulfate pour précipiter le sulfate de calcium et former une suspension aqueuse d'hydroxyde de magnésium; le sulfate de calcium précipité séparé de la suspension d'hydroxyde de magnésium peut être déshydraté pour former un produit à base d'hydroxyde de magnésium ou calciné pour produire de l'oxyde de magnésium.

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