公开(公告)号：US12139797B2

公开(公告)日：2024-11-12

申请号：US17439720

申请日：2019-03-22

Applicant: PRIMETALS TECHNOLOGIES JAPAN, LTD.

Inventor： Kosei Tsuji ,  Ryusuke Nakatsuka ,  Takahiro Yagi ,  Masashi Yoshikawa ,  Hideaki Takatani ,  Toyoaki Yasui ,  Takuya Hirata

IPC: C23G3/02 ,  C23G1/08 ,  C23G1/36

Abstract: An acid solution preparation device is an acid solution preparation device for preparing an acid solution used for pickling of a steel plate, the device including a sealed tank for storing the acid solution, a gas supply part for supplying an oxygen-containing gas from outside of the sealed tank to the sealed tank, and a purge part for discharging a gas in the sealed tank to the outside.

公开(公告)号：US12091757B2

公开(公告)日：2024-09-17

申请号：US17607781

申请日：2020-01-09

Applicant: PRIMETALS TECHNOLOGIES JAPAN, LTD.

Inventor： Kosei Tsuji ,  Ryusuke Nakatsuka ,  Masashi Yoshikawa ,  Takuya Hirata

IPC: C23G1/08 ,  C23G3/02

CPC classification number: C23G1/08 ,  C23G3/021 ,  C23G3/025

Abstract: 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.

公开(公告)号：US11162177B2

公开(公告)日：2021-11-02

申请号：US15756725

申请日：2017-02-22

Applicant: PRIMETALS TECHNOLOGIES JAPAN, LTD.

Inventor： Ryusuke Nakatsuka ,  Kosei Tsuji ,  Hideaki Suemori ,  Koichi Nakamura

IPC: C23G3/02 ,  C23G1/08 ,  B08B3/04 ,  B08B3/08 ,  B08B3/10

Abstract: To prevent over-pickling during pickling pause, shorten the time required to switch between pickling operation and pickling pause, and heat acid solution efficiently, a pickling device includes: a pickling tank for storing acid solution and for pickling a steel strip by allowing the steel strip to travel therethrough while the steel strip is immersed in the acid solution; a heat exchanger for heating the acid solution in the pickling tank; a circulation tank for storing the acid solution, provided separately from the pickling tank; an acid-solution circulation device configured to circulate the acid solution between the pickling tank and the circulation tank; a control device configured to withdraw the steel strip from the acid solution; and a guide plate disposed in the pickling tank and configured to guide the acid solution circulated in the pickling tank by the acid-solution circulation device to the heat exchanger.

公开(公告)号：US10711353B2

公开(公告)日：2020-07-14

申请号：US15756699

申请日：2017-02-22

Applicant: PRIMETALS TECHNOLOGIES JAPAN, LTD.

Inventor： Ryusuke Nakatsuka ,  Kosei Tsuji ,  Hideaki Suemori ,  Koichi Nakamura

IPC: C23G3/02 ,  C23G1/08

Abstract: To prevent over-pickling of a steel strip during pickling pause, and shorten the time required to switch between pickling operation and pickling pause, a pickling device includes: a pickling tank for storing acid solution and for pickling a steel strip by allowing the steel strip to travel therethrough while the steel strip is immersed in the acid solution; a heat exchanger for heating the acid solution in the pickling tank; a circulation tank for storing the acid solution, provided separately from the pickling tank; an acid-solution circulation unit configured to circulate the acid solution between the pickling tank and the acid-solution storage tank; and a control device configured to control the acid-solution circulation device to maintain a liquid level of the acid solution in the pickling tank at a level below a traveling height of the steel strip.

公开(公告)号：US11814736B2

公开(公告)日：2023-11-14

申请号：US16982905

申请日：2018-04-16

Applicant: PRIMETALS TECHNOLOGIES JAPAN, LTD.

Inventor： Kosei Tsuji ,  Ryusuke Nakatsuka ,  Masashi Yoshikawa ,  Shinji Nanba

IPC: C23G1/02 ,  C23G3/02 ,  B08B3/04 ,  B08B3/08 ,  C23G1/08

CPC classification number: C23G3/021 ,  B08B3/041 ,  B08B3/08 ,  C23G1/086 ,  C23G3/026 ,  C23G3/027 ,  B08B2203/007

Abstract: A pickling facility includes: a pickling tank for storing an acid solution; a conveyance part for continuously conveying a steel plate immersed in the acid solution; a measurement part for measuring at least one parameter which has a correlation with a heat transfer coefficient between the acid solution and a reference surface disposed in the acid solution so as to face the steel plate; and a conveyance speed decision part configured to decide a conveyance speed of the steel plate conveyed by the conveyance part, on the basis of a measurement result of the at least one parameter.