Method for pickling steel plate and pickling apparatus

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United States of America Patent

PATENT NO 12091757
APP PUB NO 20220220619A1
SERIAL NO

17607781

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Abstract

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A method for pickling a steel plate having a first steel plate portion and a second steel plate portion which is connected to a tail end of the first steel plate portion and which requires a longer time for pickling than the first steel plate portion when pickled under the same condition includes: a step of pickling the steel plate by immersing the steel plate in an acid solution in at least one pickling tank while conveying the steel plate; a step of circulating the acid solution, through a circulation line connected to any of the at least one pickling tank, between the pickling tank and an oxidizing device disposed in the circulation line; a step of oxidizing Fe2+ in the acid solution to Fe3+ by the oxidizing device using a gaseous oxidant; and a feeding start step of, upon switching from pickling of the first steel plate portion to pickling of the second steel plate portion, starting feeding of a liquid oxidant for oxidizing Fe2+ in the acid solution to Fe3+ to any of the at least one pickling tank or to the circulation line.

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Patent Owner(s)

Patent OwnerAddress
PRIMETALS TECHNOLOGIES JAPAN LTD6-22 KANONSHIN-MACHI 4-CHOME NISHI-KU HIROSHIMA-SHI HIROSHIMA 733-8553

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirata, Takuya Tokyo, JP 97 531
Nakatsuka, Ryusuke Hiroshima, JP 6 1
Tsuji, Kosei Hiroshima, JP 10 20
Yoshikawa, Masashi Tokyo, JP 42 602

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