Pickling device

Patent metadata

Field	Value
Publication number	US-11162177-B2
Application number	US-201715756725-A
Country	US
Kind code	B2
Filing date	Feb 22, 2017
Priority date	Apr 27, 2016
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

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.

First claim

The invention claimed is:

1. A pickling device, comprising:
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 heating unit for heating the acid solution in the pickling tank;
an acid-solution storage 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;
a withdrawing unit 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 unit to the heating unit,
wherein the pickling tank includes:
a pair of side plates each of which extends along a traveling direction of the steel strip, the pair of side plates forming vertical walls of the pickling tank on opposite sides of the pickling tank,
a supply port for the acid solution disposed on one of the pair of side plates; and
a drain port for the acid solution disposed on the other one of the pair of side plates, and

wherein the guide plate extends along a plane including the traveling direction of the steel strip and an up-down direction, and is disposed between the drain port and the supply port.

2. The pickling device according to claim 1 ,
wherein a center portion of the pickling tank is positioned fixedly with respect to the traveling direction of the steel strip, and
wherein the drain port and the supply port of the acid solution are disposed on the center portion with respect to the traveling direction of the steep strip.

3. The pickling device according to claim 1 ,
wherein the guide plate has a shape which extends upstream in the traveling direction of the steel strip from the heating unit disposed upstream with respect to the traveling direction of the steel strip, and which extends downstream in the traveling direction of the steel strip from the heating unit disposed downstream with respect to the traveling direction of the steel strip.

4. The pickling device according to claim 1 ,
wherein the acid-solution circulation unit includes a flow passage between a drain port of the pickling tank and the acid-solution storage tank, a flow passage between a supply port of the pickling tank and the acid-solution storage tank, an opening-and-closing valve disposed in at least one of the two flow passages, and a pump disposed in at least the other one of the two flow passages, and
wherein the withdrawing unit is configured to withdraw the steel strip from the acid solution by controlling opening and closing of the opening-and-closing valve and operation of the pump to adjust a liquid level of the acid solution in the pickling tank to be below a traveling height of the steel strip.

5. The pickling device according to claim 4 ,
wherein the withdrawing unit includes an inflow passage which connects to the drain port of the acid solution disposed on the pickling tank and which has an inlet positioned below the traveling height of the steel strip, such that the acid solution overflows through the inflow passage and the liquid level of the acid solution is adjusted to be below the traveling height of the steel strip, and thereby the steel strip is withdrawn from the acid solution.

6. The pickling device according to claim 1 ,
wherein the withdrawing unit includes a lifting unit capable of withdrawing the steel strip from the acid solution by lifting the steel strip above a liquid level of the acid solution, and
wherein the guide plate is foldable in a height direction, and is configured to open in a vertical direction when the steel strip is lifted above the liquid level of the acid solution by the lifting unit.

7. The pickling device according to claim 6 ,
wherein the lifting unit includes a supporting portion extending in a width direction of the pickling tank, for mounting the steel strip,
wherein the supporting portion is movable between a position where the steel strip is immersed in the acid solution and a position where the steel strip is lifted above the liquid level of the acid solution, and
wherein the guide plate has an upper portion attached to a lower portion of the supporting portion, and a lower portion fixed to a bottom plate of the pickling tank.

8. The pickling device according to claim 1 ,
wherein the heating unit is a heat exchanger.

9. A pickling device comprising:
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 heating unit for heating the acid solution in the pickling tank;
an acid-solution storage 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;
a withdrawing unit 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 unit to the heating unit,
wherein the pickling tank includes a pair of side plates each of which forms a vertical wall of the pickling tank on opposite sides of the pickling tank,
wherein the heating unit is arranged along each of the pair of side plates of the pickling tank inside the pickling tank, and
wherein the guide plate is disposed between the heating unit disposed along one of the pair of side plates and the heating unit disposed along the other one of the pair of side plates.

10. A The pickling device comprising:
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 heating unit for heating the acid solution in the pickling tank;
an acid-solution storage 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;
a withdrawing unit 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 unit to the heating unit,
wherein the acid-solution circulation unit includes a flow passage between a drain port of the pickling tank and the acid-solution storage tank, a flow passage between a supply port of the pickling tank and the acid-solution storage tank, an opening-and-closing valve disposed in at least one of the two flow passages, and a pump disposed in at least the other one of the two flow passages,
wherein the withdrawing unit is configured to withdraw the steel strip from the acid solution by controlling opening and closing of the opening-and-closing valve and operation of the pump to adjust a liquid level of the acid solution in the pickling tank to be below a traveling height of the steel strip,
wherein the withdrawing unit includes an inflow passage which connects to the drain port of the acid solution disposed on the pickling tank and which has an inlet positioned below the traveling height of the steel strip, such that the acid solution overflows through the inflow passage and the liquid level of the acid solution is adjusted to be below the traveling height of the steel strip, and thereby the steel strip is withdrawn from the acid

Assignees

• Primetals Tech Japan Ltd

Inventors

• Nakatsuka Ryusuke
• Tsuji Kosei
• Suemori Hideaki
• Nakamura Koichi

Classifications

• C23G1/081

  solutions containing H2SO4 · CPC title

• C23G1/08

  Iron or steel · CPC title

• C23G3/027

  Associated apparatus, e.g. for pretreating or after-treating · CPC title

• C23G3/021 Primary

  by dipping · CPC title

• C23G3/025 Primary

  Details of the apparatus, e.g. linings or sealing means · CPC title