Method for removing deposits containing magnetite and copper...

Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment

Reexamination Certificate

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C134S022100, C134S022110, C134S022130, C134S022140, C134S022190, C134S026000, C134S027000, C134S029000, C134S030000, C134S035000, C134S036000, C134S042000, C510S108000, C510S109000, C510S375000, C510S435000

Reexamination Certificate

active

07931753

ABSTRACT:
A method to remove deposits containing magnetite and copper from a container, particularly from a steam generator of a nuclear power plant. In a first step, the container is treated using an alkaline cleaning solution containing a complexing agent forming a soluble complex with iron ions, a reducing agent, and an alkalizing agent. 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.

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International Search Report dated Jun. 23, 2008.

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