Composition, apparatus and method of conditioning scale on a...

C - Chemistry – Metallurgy – 23 – G

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C23G 3/02 (2006.01) C23G 1/14 (2006.01) C23G 1/19 (2006.01)

Patent

CA 2395426

A composition and apparatus and method of using the composition for aqueous spray descaling or conditioning of scale or oxide on metal surface, especially stainless steel strip or the like, in one embodiment, althrough it can be used to descale or condition oxide or scale on other work pieces such as metal bar, or even discrete objects. An aqueous solution having a base composition of an alkali metal hydroxide, such as sodium hydroxide, potassium hydroxide, or a mixture of alkali metal hydroxides such as sodium hydroxide and potassium hydroxide is used. The aqueous solution may contain certain additives to improve the descaling performance of the salt. In one embodiment, the solution is used to condition the scale or surface oxide on a strip of stainless steel. The strip of steel is at a temperature between the melting point of the alkali metal hydroxide in anhydrous form and a temperature at which the Leidenfrost effect appears. One or more nozzles is provided to spray the solution, and the heated strip is passed by the nozzle or nozzles where the solution is sprayed on the surface or surfaces of the strip that have the scale or oxide. The invention also includes the apparatus and control thereof for the spraying of the solution.

L'invention concerne une composition, un appareil et un procédé d'utilisation de la composition pour procéder à l'élimination du tartre par pulvérisation aqueuse ou au traitement du tartre ou de l'oxyde sur des surfaces métalliques, notamment, dans un mode de réalisation, sur des bandes d'acier inoxydable et analogues. Le procédé peut également s'utiliser pour éliminer ou traiter l'oxyde ou le tartre sur d'autres pièces de travail, telles qu'une barre métallique, par exemple. Une solution aqueuse est utilisée, ayant une composition de base d'un hydroxyde métallique alcalin, tel que l'hydroxyde de sodium, l'hydroxyde de potassium, ou un mélange d'hydroxydes métalliques alcalins, tel que l'hydroxyde de sodium et l'hydroxyde de potassium. La solution aqueuse peut renfermer certains additifs qui améliorent la performance de détartrage du sel. Dans un mode de réalisation, la solution est utilisée pour traiter le tartre ou l'oxyde de surface sur une bande d'acier inoxydable. La bande d'acier a une température comprise entre le point de fusion de l'hydroxyde métallique alcalin sous une forme anhydre et une température à laquelle se manifeste l'effet Leidenfrost. Une ou plusieurs buses servent à pulvériser la solution, buses qui passent au-dessus de la bande et pulvérisent les surfaces comportant le tartre ou l'oxyde. L'invention concerne également l'appareil destiné à pulvériser la solution, et la commande de l'appareil.

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