Method and arrangement for regenerating a contaminated metal bath
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United States of America Patent
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-
Oct 28, 2003
Grant Date -
Nov 15, 2001
app pub date -
Apr 26, 2001
filing date -
Apr 26, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and a system for regenerating a metal bath contaminated by mixed crystals, particularly a tin bath (17) in a hot-dip coating process. A partial stream of the tin bath (17) is removed from the coating tank (15) and is first of all heated above its liquidus temperature in a heating unit (24). Subsequently, the tin bath is conducted over a cooling unit (27) and, while flowing through a filter (29), is cleaned of mixed crystals coming down as a result of the cooling. The filter 29 is a ceramic foam filter made of silicon carbide. Subsequently, the regenerated tin bath (17a) is heated in a melting tank to process temperature, and returned from there to the coating tank (15).
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