Pickling of stainless steels while continuously reoxidizing cata

Details Pickling of stainless steels while continuously reoxidizing cata Pickling of stainless steels while continuously reoxidizing cata

1997-02-26

1998-07-28

Warden, Jill

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 3, 134 10, 134 41, 423DIG1, C23G 102

Patent

active

057857652

ABSTRACT:
In a pickling process for stainless steels or similar ferrous alloys, continuous reoxidation of Fe.sup.2+ to Fe.sup.3+ and/or NOx to nitric acid in the pickling liquor is economically performed by continuously treating a portion of the pickling liquor into a separate reactor where it is contacted with oxygen onto a catalytic bed and recycling the solution so reoxidized into the pickling bath. The need of continuously adding an oxidant in the form of hydrogen peroxide and of stabilizing compounds into the pickling bath is eliminated altogether thus achieving a dramatic reduction of the processing costs.

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