Granted Patent B2

US 12,371,800 · App. 18/571,939 · Granted Jul 29, 2025

Inventors: Naohiko Matsuda (Tokyo, JP); Takashi Nakano (Tokyo, JP); Yuki Maehashi (Tokyo, JP); Shinji Namba (Tokyo, JP); Masashi Yoshikawa (Tokyo, JP); Kosei Tsuji (Hiroshima, JP); Takahiro Yagi (Hiroshima, JP); Ryusuke Nakatsuka (Hiroshima, JP)

Assignee: PRIMETALS TECHNOLOGIES JAPAN, LTD.

C23G3/025

Abstract

Claims (40)

1. A pickling apparatus for pickling a strip of metal being conveyed, comprising:

a pickling tank for storing an acid solution;

a surrounding part disposed in the pickling tank so as to surround a strip immersed in the acid solution in the pickling tank; and

an oxidant supply part for supplying a liquid oxidant toward an inside of the surrounding part,

wherein the surrounding part includes an upper plate part and a lower plate part disposed so as to cover both faces of the strip, and a pair of side plate parts disposed so as to connect the upper plate part and the lower plate part on both sides of the strip.

2. The pickling apparatus according to claim 1 ,

wherein the surrounding part forms a passage for the acid solution along a conveying direction of the strip, and

wherein the passage has a passage decreasing part located downstream of an upstream end of the surrounding part in the conveying direction and having a smaller passage cross-sectional area than the upstream end.

3. The pickling apparatus according to claim 2 , comprising:

a guide part disposed in the surrounding part and configured to guide the strip,

wherein the passage decreasing part is formed by the guide part.

4. The pickling apparatus according to claim 2 ,

wherein the oxidant supply part is configured to supply the liquid oxidant at a position upstream of the passage decreasing part in the conveying direction.

5. The pickling apparatus according to claim 1 ,

wherein the oxidant supply part is configured to supply the liquid oxidant at a position where a length from an upstream end of the surrounding part is above 0 and at most L/2, where L is a length of the surrounding part in a conveying direction of the strip.

6. The pickling apparatus according to claim 1 ,

wherein the oxidant supply part includes at least one pipe connected to the surrounding part and is configured to supply the liquid oxidant into the surrounding part via the pipe.

7. The pickling apparatus according to claim 6 ,

wherein the at least one pipe includes a plurality of pipes connected to the surrounding part at mutually different positions in a strip width direction of the strip.

8. The pickling apparatus according to claim 6 , comprising:

a check valve disposed in the at least one pipe.

9. The pickling apparatus according to claim 1 ,

wherein the oxidant supply part includes a pipe penetrating at least either of the upper plate part or the lower plate part.

10. The pickling apparatus according to claim 1 ,

wherein the oxidant supply part includes a pipe penetrating at least either of the pair of side plate parts.

11. The pickling apparatus according to claim 1 , comprising:

a lid part covering the pickling tank from above,

wherein the lid part is disposed to be openable and closable integrally with the upper plate part, and

wherein the oxidant supply part includes:

an oxidant tank for storing the liquid oxidant;

a pipe connected to the upper plate part; and

a flexible hose disposed between the oxidant tank and the pipe.

12. The pickling apparatus according to claim 1 , comprising:

an acid solution circulation line configured to extract the acid solution from the pickling tank and return the acid solution toward the inside of the surrounding part in the pickling tank.

13. The pickling apparatus according to claim 12 ,

wherein the oxidant supply part includes a pipe connected to the acid solution circulation line, and is configured to supply the liquid oxidant toward the inside of the surrounding part via the acid solution circulation line.

14. A pickling method for pickling a strip of metal being conveyed, comprising:

a step of conveying the strip in a state where the strip is immersed in an acid solution stored in a pickling tank and the strip is surrounded by a surrounding part disposed in the pickling tank; and

a step of supplying a liquid oxidant toward an inside of the surrounding part,

wherein the surrounding part includes an upper plate part and a lower plate part disposed so as to cover both faces of the strip, and a pair of side plate parts disposed so as to connect the upper plate part and the lower plate part on both sides of the strip.

Assignments (1)

Continuity (1)

References Cited (16)