Process for treating brass components to substantially...

C - Chemistry – Metallurgy – 23 – F

Patent

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C23F 1/00 (2006.01) E03B 7/09 (2006.01) E03C 1/04 (2006.01)

Patent

CA 2340645

A process for the treatment of brass components to reduce leachable lead therefrom when the components are exposed to water which includes the steps of first cleaning the brass components with a cleaning agent in the form of a mineral acid, a mineral acid plus an oxidizing agent, ammonium chloride or ferric chloride and then rinsing to remove the cleaning agent. Thereafter, the brass components are contacted with a lead removal reagent after which the brass components are washed again. It is also possible, in the preferred embodiment, to remove any leachable lead remaining on the surface of the brass components by the additional step of treating the brass components with a water soluble acid and thereafter rinsing the components to leave the components substantially free of the acid. The process as disclosed reduces the leachable lead to well within the most stringent state and/or federal guidelines.

L'invention porte sur un procédé de traitement de pièces de laiton en réduisant la teneur en plomb lixiviable lorsqu'on les expose à l'eau. Le procédé consiste à: laver les pièces à l'aide d'un agent de nettoyage qui peut être soit un acide minéral, soit un acide minéral plus un oxydant, soit un chlorure d'ammonium ou de fer; à rincer pour éliminer les agents de nettoyage; à mettre en contact les pièces avec un réactif éliminant le plomb; puis à procéder à un deuxième lavage des pièces. On peut également dans l'exécution préférée éliminer tout le plomb lixiviable restant à la surface des pièces en les traitant dans une étape supplémentaire par un acide hydrosoluble, puis en les rinçant jusqu'à élimination quasi totale de l'acide. Ledit procédé ramène la teneur en plomb lixiviable très en dessous des directives les plus sévères des états et fédérales.

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