Flue gas desulfurization with oxidation of calcium sulfite...

B - Operations – Transporting – 01 – D

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23/103, 23/349

B01D 53/14 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01F 11/46 (2006.01)

Patent

CA 2023434

A method for removing sulfur dioxide from flue gases, with oxidation of calcium sulfite in the discharge from a liquid scrubbing system to produce gypsum, oxidizes the sulfite in a thickener overflow at a pH of between 4.0 and 6.5. The calcium sulfite is oxidized to a calcium sulfate which precipitates from the aqueous media and is separated, while the acidic aqueous media is recycled to an acidification step preceding the oxidation. A further minor portion of scrubber slurry may be discharged from the liquid scrubber unit at a pH of 4.5 to 6.0 and also treated with acid, oxidized, and the resultant gypsum separated.

Méthode pour éliminer le dioxyde de soufre dans les gaz de carneau, avec oxydation du sulfite de calcium dans le rejet provenant d'un système de lavage par un liquide pour l'obtention de gypse; la méthode consiste à oxyder le sulfite dans un trop-plein d'épaississant à un pH de 4,0-6,5. Le sulfite de calcium est oxydé en sulfate de calcium qui précipite dans le milieu aqueux et est séparé, alors que le milieu aqueux acide est recyclé vers une unité d'acidification précédant celle d'oxydation. Une autre fraction mineure de la suspension du système de lavage peut être évacuée de l'unité de lavage à un pH de 4,5-6,0, puis traitée elle aussi avec un acide et oxydée, le gypse résultant étant séparé.

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