Patent ID: 6406524
Filing Date: 2002-06-18
Classification: B01D,C25C

Abstract:
A plant for dry cleaning by removing fluorine containing waste gases from a reduction process in several electrolytic cells for aluminum, comprising: a central storing place for aluminum oxide from which a piping system distributes the aluminum oxide from the central storing place to a plurality of decentralized cleaning plants, each decentralized cleaning plant comprising a storage portion to store aluminum oxide before and after use in the decentralized cleaning plant, in flow communication with a filter portion, the filter portion using aluminum oxide to remove fluorine containing waste gases from a waste gas flow; and an exhaust fan integrated with a top part of the filter portion of each decentralized cleaning plant, wherein a separate silo is not employed, and each decentralized cleaning plant is adapted to serve groups of between 5 and 40 electrolytic cells.