Patent ID: 7703463
Filing Date: 2010-04-27
Classification: C23G

Abstract:
1. An installation for pickling a hollow part having an axis of rotation, the installation comprising: a support arranged with means for holding said hollow part with said axis of rotation in a horizontal orientation and with means for rotating the hollow part about said axis of rotation; a vessel containing a pickling composition; means for moving said support holding said hollow part up and down with respect to said vessel to enable partial immersion of said hollow part into said pickling composition, the hollow part configured to allow said pickling composition to penetrate into an inside of said hollow part; pump means for continuously removing said pickling composition from the inside of said hollow part; and means for maintaining a substantially constant level of the pickling composition relative to said hollow part so that the pickling composition is renewed regularly inside said hollow part, wherein said pump means include a plurality of suction ducts, each duct having a suction end situated in a vicinity of an inner wall of said hollow part in a most-deeply immersed portion of said hollow part, and for pickling a rotor wheel made up of welded-together disks and including a plurality of annular cavities about an axis of rotation of the rotor wheel, a number of said suction ducts equals a number of said annular cavities, the ducts dipping into corresponding annular cavities.