Method and apparatus for continuous pickling of metal strip
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United States of America Patent
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-
Sep 8, 1998
Grant Date -
N/A
app pub date -
Jan 13, 1997
filing date -
Jan 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for continuous pickling of metal strip comprises a series of pickling tanks in which the strip is submerged in pickling liquid in a caternary loop and wherein passage of the strip through the liquid produces a low liquid level at a strip entry end of each tank and a high liquid level end at a strip exit end of each tank, piping external to the tanks is provided through which pickling liquid cascades from the high liquid level end of one tank to the low liquid level end of an adjacent tank upstream thereof in a direction opposite the direction of strip travel. Valves in the cascade piping control the amount of pickling liquid flowing in the cascade piping. Pickling tank bottoms are sloped at either end to increase stirring action of the moving strip, and a holding tank or plurality of holding tanks are provided to empty the pickling tanks for repair and maintenance.
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