Method for removing deposits containing magnetite and copper...

C - Chemistry – Metallurgy – 23 – G

Patent

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C23G 1/00 (2006.01) B08B 9/00 (2006.01) B08B 9/08 (2006.01) C23G 1/19 (2006.01) C23G 1/20 (2006.01) F22B 37/48 (2006.01) F28G 9/00 (2006.01)

Patent

CA 2678753

The invention relates to a method for removing deposits containing magnetite and copper from a container, particularly from a steam generator of a nuclear power plant, wherein - in a first step the container is treated using an alkaline cleaning solution comprising a complexing agent forming a complex soluble with iron ions, a reducing agent, and an alkalizing agent, and - in a second step a further complexing agent forming a more stable complex with iron III ions than the complexing agent used in the first step and an oxidant are added to the cleaning solution of the first step present in the container.

L'invention concerne un procédé d'élimination de dépôts contenant de la magnétite et du cuivre d'un contenant, notamment d'un générateur de vapeur d'une centrale nucléaire, selon lequel - lors d'une première étape, le contenant est traité avec une solution de nettoyage alcaline qui contient un agent complexant qui forme un complexe soluble avec des ions fer, un agent de réduction et un agent d'alcalinisation, et - lors d'une seconde étape, un autre agent complexant, qui forme avec des ions fer III un complexe plus stable que l'agent complexant utilisé lors de la première étape, et un agent d'oxydation sont ajoutés à la solution de nettoyage de la première étape qui se trouve dans le contenant.

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