Cleaning and liquid contact with solids – Processes – Using solid work treating agents
Patent
1996-05-24
1997-12-30
Warden, Robert J.
Cleaning and liquid contact with solids
Processes
Using solid work treating agents
134 10, 134 15, 134 28, 134 41, B08B 102, B08B 308, C23G 102
Patent
active
057025347
ABSTRACT:
A process for removing scale from stainless steel using an aqueous solution containing hydrogen peroxide. A hot rolled or annealed stainless steel strip (10) covered with scale is immersed into hot sulfuric acid contained within tanks (12) and (14). Thereafter, the strip may have residual amounts of tightly adherent scale (11). This scale is activated by the aqueous solution containing hydrogen peroxide applied to the strip such as by a spray header (16) extending completely transversely across and positioned above the strip and another spray header (18) extending completely transversely across and positioned below the strip. Any peroxide spray dripping from the, strip is collected on a catch pan (30) and flowed into a tank (28). Preferably, the peroxide solution is a dilute concentration of the acid in tanks (12) and (14). The hydrochloric acid removes smut from the strip formed by the sulfuric acid to improve the cleanliness of the pickled strip.
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Leeker Jerald W.
Rodabaugh Ronald D.
Armco Inc.
Bunyard R. J.
Chaudhry Saeed
Fillnow L. A.
Warden Robert J.
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