Method for oxidation of organic waste liquors

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 11/06 (2006.01) C02F 1/04 (2006.01) C02F 1/38 (2006.01) C02F 1/72 (2006.01) F23G 5/08 (2006.01) F23G 5/46 (2006.01) F23G 7/04 (2006.01) B01D 1/14 (2006.01)

Patent

CA 2201856

A method for essentially complete oxidation of concentrated liquors containing oxidable organic matter is disclosed. The following steps are performed under substantial superatmospheric pressure in the method: a feed of the concentrated liquor (8) is brought into direct contact (7) with a hot gas (5) for heating and evaporation of said liquor to produce a final concentrate (11) suitable for oxidation and at a temperature close to its boiling point, and to quench the hot gas to a temperature not more than 100 °C above the final conconcentrate boiling point at the prevailing superatmospheric pressure, the final concentrate (11) is oxidised (1) essentially completely at a temperature of at least 800 °C with a gas (13) containing at least 60 per cent by volume of oxygen resulting in a suspension of hot gas (5) and molten slag (6), and the molten slag is separated (6) from the hot gas and dissolved in water (15).

Procédé permettant d'effectuer l'oxydation essentiellement complète de liqueurs concentrées contenant des matières organiques oxydables. Ce procédé, réalisé sous pression sensiblement suratmosphérique, consiste à mettre en contact direct (7) avec un gaz chaud (5) une charge d'alimentation en liqueur concentrée (8) en vue de chauffer et d'évaporer ladite liqueur pour produire un concentré final (11) pouvant être oxydé et présentant une température proche de son point d'ébullition, et pour refroidir le gaz chaud à une température ne dépassant pas le point d'ébullition du concentré final de plus de 100 DEG C à la pression suratmosphérique; puis à oxyder (1) presque complètement le concentré final (11) à une température d'au moins 800 DEG C au moyen d'un gaz (13) contenant au moins 60 % en volume d'oxygène, ce qui permet d'obtenir une suspension d'un gaz chaud (5) et de scories fondues (6), et enfin, à séparer (6) ces scories fondues du gaz chaud et à les dissoudre dans l'eau (15).

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