CN108025222B - Scraper device of crystallization tank - Google Patents
Scraper device of crystallization tank Download PDFInfo
- Publication number
- CN108025222B CN108025222B CN201680055889.0A CN201680055889A CN108025222B CN 108025222 B CN108025222 B CN 108025222B CN 201680055889 A CN201680055889 A CN 201680055889A CN 108025222 B CN108025222 B CN 108025222B
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- scraper
- crystallization tank
- doctor blade
- concave
- convex
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/02—Crystallisation from solutions
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/16—Regeneration of process solutions
- C25D21/18—Regeneration of process solutions of electrolytes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Accessories For Mixers (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Cleaning In General (AREA)
Abstract
Provided is a scraper device for a crystallization tank, which can accurately scrape off a crystallized product (crystal) adhering to the inner surface of the crystallization tank even when a convex portion and a concave portion are generated on the inner surface of the crystallization tank. In order to scrape off a crystallized substance (32) adhering to an inner surface (3a) of an inner cylinder (3), a scraper device (10) is provided with: a projection scraper (12) for scraping off the crystallized product (32) adhering to the projection (3A); and a recess scraper (14) for scraping off the crystallized product (32) adhering to the recess (3B).
Description
Technical Field
The present invention relates to a scraper device for scraping off crystallized substances (crystals) adhering to the inner surface of a crystallization tank in the crystallization tank for regenerating a used plating solution or the like.
Background
In a plating solution (for example, a methanesulfonic acid solution) used for plating a steel sheet with tin, iron components, moisture, and sludge are mixed. The plating liquid is regenerated by removing these mixtures (iron component, moisture, sludge), and for this purpose, a plating liquid regeneration apparatus (e.g., a methanesulfonic acid regeneration apparatus) is used.
In this plating liquid regenerating apparatus, after the used plating liquid is concentrated to a predetermined concentration (for example, 4 times the concentration) by the concentrating device, the concentrated plating liquid is transferred to a cylindrical tank called a crystallization tank (crystallizing tank), and the plating liquid is cooled to a predetermined temperature (for example, -4 ℃) by the crystallization tank, whereby the iron component dissolved in the plating liquid is crystallized and precipitated. Then, the iron crystals crystallized in the plating liquid are separated from the plating liquid by a solid-liquid separator.
In this case, the crystallization tank is provided with a cooling device on the outer surface of the crystallization tank to cool the solution in the crystallization tank to a predetermined temperature. A part of crystals (crystallized product) crystallized from the solution adheres to the inner surface of the crystallization tank, and there is a possibility that the heat transfer efficiency of the cooling device is lowered and the solution in the crystallization tank cannot be cooled and maintained at a predetermined temperature. In the case where the solution in the crystallization tank cannot be cooled and maintained at a predetermined temperature, from the viewpoint of maintenance of facilities and quality assurance, it is necessary to stop the liquid transfer to the crystallization tank and to stop the operation of the apparatus after the crystallization tank.
Therefore, in general, in the crystallization tank, a scraper (scraper) is provided at the end of a stirrer that stirs the solution in the crystallization tank in order to scrape off crystals adhering to the inner surface of the crystallization tank (see, for example, patent documents 1 and 2).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-11986
Patent document 2: japanese patent laid-open No. 2012 and 246263
Disclosure of Invention
Problems to be solved by the invention
As described in patent documents 1 and 2, in the crystallization tank, a scraper is provided at the end in the tank radial direction of a stirrer for stirring the solution in the crystallization tank in order to scrape off crystals adhering to the inner surface of the crystallization tank.
When the inner surface of the crystallization tank is a perfect circle, the scraper uniformly contacts the inner surface of the crystallization tank over the entire circumference, and therefore there is no problem. However, when the inner surface of the crystallization tank is not perfectly round due to aging of the crystallization tank or the like (deformation due to the weight of the pipe attached to the tank or the like), and a convex portion and a concave portion are formed on the inner surface of the crystallization tank, the scraper cannot uniformly contact the inner surface of the crystallization tank over the entire circumference, and the scraper is largely warped and deformed when passing through the convex portion or the like, and cannot be restored, so that the crystal adhering to the inner surface of the crystallization tank cannot be accurately scraped off, and the adhered crystal remains.
As a result, crystals adhering to the inner surface of the crystallization tank grow, and the thickness of the crystal layer becomes thick (for example, about 10 mm), so that the heat transfer efficiency of the cooling device is lowered, and the solution in the crystallization tank cannot be cooled and maintained at a predetermined temperature. In this way, from the viewpoint of quality assurance and maintenance of equipment, it is necessary to stop the supply of the liquid to the crystallization tank and to stop the operation of the apparatus after the crystallization tank.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a scraper device for a crystal growth vessel, which can accurately scrape off crystallized substances (crystals) adhering to the inner surface of the crystal growth vessel even when a convex portion and a concave portion are generated on the inner surface of the crystal growth vessel.
Means for solving the problems
In order to solve the above problems, the present invention has the following features.
[1] A scraper device for a crystallization tank, which is provided at a distal end in a tank radial direction of a stirrer for stirring a solution in the crystallization tank, and scrapes off a crystallized product adhering to an inner surface of a cylindrical crystallization tank, the scraper device for a crystallization tank comprising: a protrusion scraper for scraping off the crystallized substances adhering to the protrusions on the inner surface of the crystallization tank; and a recess scraper for scraping off the crystallized substances adhered to the recess of the inner surface of the crystallization tank.
[2] The doctor apparatus for a crystallizer according to [1], wherein a recess doctor blade support member for restoring the recess doctor blade after the recess doctor blade is warped and deformed is attached to the doctor apparatus for a crystallizer.
[3] The doctor apparatus for a crystallizer tank according to any one of [1] and [2], wherein a convex portion doctor blade support member for restoring the convex portion doctor blade after the convex portion doctor blade is warped and deformed is attached to the doctor apparatus for a crystallizer tank.
[4] The doctor apparatus for a crystallization tank according to any one of [1] to [3], wherein four members of the convex portion doctor blade, the convex portion doctor blade support member, the concave portion doctor blade, and the concave portion doctor blade support member are stacked and fixed to the stirring blade by a bolt and a nut.
[5] The doctor blade device for a crystallization tank according to any one of [1] to [4], wherein the convex portion doctor blade is configured such that a gap between the convex portion doctor blade and an inner surface of the crystallization tank at a position where a distance from a central axis of the crystallization tank is shortest in the convex portion doctor blade is 0mm to 1.5mm, and the concave portion doctor blade is configured such that a gap between the concave portion doctor blade and an inner surface of the crystallization tank at a position where a distance from the central axis of the crystallization tank is longest in the concave portion doctor blade is 0mm to 1.5 mm.
[6] The doctor blade apparatus for a crystallization tank according to any one of [1] to [5], wherein the solution in the crystallization tank is a methanesulfonic acid solution used for plating a steel sheet with tin.
Effects of the invention
In the present invention, even when the inner surface of the crystallization tank has projections and recesses, the crystallized product (crystal) adhering to the inner surface of the crystallization tank can be scraped off accurately.
Drawings
FIG. 1 is a longitudinal sectional view showing a crystallization tank in an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing a crystallization tank in one embodiment of the present invention.
Fig. 3 is a plan view showing a planar shape of a blade in one embodiment of the present invention.
Detailed Description
An embodiment of the present invention will be described with reference to the drawings. Here, the description will be given taking the example of a crystallization tank in a plating liquid regenerating apparatus (for example, a methanesulfonic acid regenerating apparatus).
Fig. 1 is a longitudinal sectional view showing a crystallization tank according to an embodiment of the present invention, and fig. 2 is a transverse sectional view showing the crystallization tank according to the embodiment of the present invention.
As shown in fig. 1 and 2, a crystallization tank 1 according to an embodiment of the present invention has a cylindrical shape and includes: an outer cylinder 2; an inner cylinder 3 provided inside the outer cylinder 2; a top plate 5a covering the upper portions of the outer cylinder 2 and the inner cylinder 3; and a bottom plate 5b located at the lower portions of the outer cylinder 2 and the inner cylinder 3. The crystallization tank 1 is made of SUS304, for example, and has a plate thickness of 2 to 6 mm.
Then, the coolant 4 is supplied to the gap between the outer cylinder 2 and the inner cylinder 3 in order to cool the plating liquid 30 to be regenerated, which is supplied into the inner cylinder 3.
Further, an agitator 6 is provided for agitating the plating liquid 30 to be regenerated, which is supplied into the inner cylinder 3. The mixer 6 has: a motor 7 provided on the top plate; a rotating shaft 8 extending downward from the motor 7 in the inner tube 3; and stirring blades 9 extending from the rotating shaft 8 in the tank radial direction. The stirring blade 9 rotates about the rotation shaft 8.
Thus, in the crystallization vessel 1, the plating liquid 30 to be regenerated supplied into the inner cylinder 3 is cooled to a predetermined temperature by the cooling liquid 4 through the inner cylinder 3 while being stirred by the stirrer 6, and thereby the iron component dissolved in the plating liquid 30 is crystallized and precipitated in the plating liquid 30 as the crystallized product 31.
In this crystallization tank 1, as shown in fig. 2, due to aging or the like, the projections 3A and the recesses 3B are formed on the inner surface of the crystallization tank 1 (the inner surface 3A of the inner tube 3). The convex portion 3A is a portion having a relatively short distance from the central axis of the crystallization tank 1 (the axial center 8a of the rotating shaft 8) to the inner surface of the crystallization tank 1 (the inner surface 3A of the inner cylinder 3). The recess 3B is a portion having a relatively long distance from the central axis of the crystallization tank 1 (the axial center 8a of the rotating shaft 8) to the inner surface of the crystallization tank 1 (the inner surface 3a of the inner cylinder 3). For example, a portion where the distance from the axial center 8a of the rotary shaft 8 to the inner surface 3A of the inner tube 3 is smaller than a reference value is defined as a convex portion 3A, and a portion where the distance from the axial center 8a of the rotary shaft 8 to the inner surface 3A of the inner tube 3 is equal to or larger than the reference value is defined as a concave portion 3B, with the average value of the distances from the axial center 8a of the rotary shaft 8 to the inner surface 3A of the inner tube 3 being a reference value.
Therefore, in the present embodiment, in order to scrape off the crystallized product 32 (not shown in fig. 1) adhering to the inner surface 3A of the inner cylinder 3, the scraper device 10 is provided at the end in the groove radial direction of the stirrer 6, and the scraper device 10 includes the convex portion scraper 12 for scraping off the crystallized product 32 adhering to the convex portion 3A and the concave portion scraper 14 for scraping off the crystallized product 32 adhering to the concave portion 3B.
That is, the detailed description is as follows.
The doctor blade device 10 is provided from the vicinity of the top plate 5a to the vicinity of the bottom plate 5b of the crystallization tank 1, and includes: a blade mounting plate 11 disposed at the end of the stirring blade 9 of the stirrer 6 in the tank radial direction; and a convex scraper 12, a convex scraper support plate 13, a concave scraper 14, and a concave scraper support plate 15, wherein the convex scraper 12, the convex scraper support plate 13, the concave scraper 14, and the concave scraper support plate 15 are stacked in this order from the front to the back in the rotation direction S of the mixer 6, and are mounted on the scraper mounting plate 11 by bolts and nuts 16.
Fig. 3 is a plan view showing planar shapes of the convex portion blade 12, the convex portion blade support plate 13, the concave portion blade 14, and the concave portion blade support plate 15. The planar shapes are all rectangular, the longitudinal lengths are the same, but the lengths in the end direction are different. Further, the bolt and nut 16 mounting hole 17 is made as a long hole so that the mounting position in the tip direction can be changed/adjusted.
The projection scraper 12 is a scraper for scraping off the crystallized product 32 adhering to the projection 3A. For example, made of Teflon (registered trademark) and having a thickness of 0.5 to 3 mm. The convex portion scraper support plate 13 is a support plate for the following applications: the support plate can restore the projection scraper 12 even if the support plate is warped and deformed by the resistance from the crystallized product 32 when the projection scraper 12 scrapes off the crystallized product 32 adhering to the projection 3A. The protruding scraper support plate 13 is made of, for example, Teflon (registered trademark) and has a thickness of 1 to 6 mm.
On the other hand, the recess scraper 14 is a scraper for scraping off the crystallized product 32 adhering to the recess 3B. For example, made of Teflon (registered trademark) and having a thickness of 1 to 4 mm. The concave portion blade support plate 15 is a support plate for the following applications: the support plate can restore the concave portion scraper 14 after the concave portion scraper 14 is largely warped and deformed when passing through the convex portion 3A. The blade support plate 15 for concave part is made of stainless spring steel, for example, and has a thickness of 0.2 to 0.6 mm.
From the viewpoint of maintaining the heat transfer efficiency of the coolant 4, suppressing the wear of the scraper device 10, and preventing the overload of the stirrer 6, it is preferable that the clearance between the protrusion scraper 12 and the inner surface 3A of the inner tube 3 is 0mm to 1.5mm at the position where the distance from the axial center 8a of the rotating shaft 8 to the inner surface 3A of the inner tube 3 is shortest in the protrusion 3A, and the clearance between the recess scraper 14 and the inner surface 3A of the inner tube 3 is 0mm to 1.5mm at the position where the distance from the axial center 8a of the rotating shaft 8 to the inner surface 3A of the inner tube 3 is longest in the recess 3B.
With the above configuration, even when the projections 3A and the recesses 3B are formed on the inner surface of the crystallization tank 1 (the inner surface 3A of the inner tube 3), the present embodiment can accurately scrape off the crystallized product (crystal) adhering to the inner surface of the crystallization tank 1 (the inner surface 3A of the inner tube 3).
In the doctor blade of the type that presses the inner surface of the crystallization tank 1, it is difficult to make the doctor blade follow the irregularities of the inner cylinder 3. In the present invention, however, the scraper can easily follow the irregularities of the inner cylinder 3 by adjusting the gap between the scraper and the inner surface 3a of the inner cylinder 3 according to the irregularities.
In the above embodiment, the convex portion scraper 12 is provided in front of the rotation direction S of the agitator 6, and the concave portion scraper 14 is provided behind the rotation direction S of the agitator 6.
In the above-described embodiment, the crystallization tank in the plating liquid regenerating device (for example, methanesulfonic acid regenerating device) is considered, but the present invention can also be applied to a crystallization tank for other applications.
Description of the reference symbols
1: a crystallization tank; 2: an outer cylinder; 3: an inner barrel; 3 a: the inner surface of the inner cylinder; 3A: a convex portion; 3B: a recess; 4: cooling liquid; 5 a: a top plate; 5 b: a base plate; 6: a blender; 7: a motor; 8: a rotating shaft; 8 a: the axis of the rotating shaft; 9: a stirring wing; 10: a scraper device; 11: a scraper mounting plate; 12: a scraper for the convex part; 13: a scraper supporting plate for the convex part; 14: a scraper for concave parts; 15: a scraper supporting plate for concave part; 16: a bolt and a nut; 17: mounting holes (long holes) for bolts and nuts; 30: electroplating solution; 31: crystallization in the plating solution; 32: and the crystallized substances are attached to the inner surface of the crystallization tank.
Claims (5)
1. A scraper device for a crystallizer, which is provided at the end in the tank radial direction of a stirrer for stirring a solution in the crystallizer and scrapes off a crystallized product adhering to the inner surface of a cylindrical crystallizer,
the scraper device for a crystallization tank is characterized by comprising:
a protrusion scraper for scraping off the crystallized substances adhering to the protrusions on the inner surface of the crystallization tank; and
a recess scraper for scraping off the crystallized substances adhered to the recess of the inner surface of the crystallization tank,
the doctor blade device for the crystallizer is provided with a concave part doctor blade supporting component which is made of stainless steel spring steel and has a thickness of 0.2 mm-0.6 mm, the concave part doctor blade supporting component is used for restoring the concave part doctor blade after the concave part doctor blade generates buckling deformation,
the doctor blade device for the crystallization tank is provided with a hard Teflon doctor blade supporting member for convex part with the thickness of 1 mm-6 mm, and the doctor blade supporting member for the convex part is used for restoring the doctor blade for the convex part after the convex part is warped and deformed.
2. The doctor apparatus for a crystal growth tank according to claim 1,
the four members of the convex scraper, the convex scraper supporting member, the concave scraper and the concave scraper supporting member are overlapped and fixed on the stirring blade by a bolt and a nut.
3. The doctor apparatus for a crystallization tank according to claim 1 or 2,
the convex portion scraper is configured such that a gap between the convex portion scraper and an inner surface of the crystallization tank at a position where a distance from a center axis of the crystallization tank is shortest in the convex portion is 0mm to 1.5mm, and the concave portion scraper is configured such that a gap between the concave portion scraper and an inner surface of the crystallization tank at a position where a distance from the center axis of the crystallization tank is longest in the concave portion is 0mm to 1.5 mm.
4. The doctor apparatus for a crystallization tank according to claim 1 or 2,
the solution in the crystallization tank was a methanesulfonic acid solution used for plating a steel sheet with tin.
5. The doctor apparatus for a crystal growth tank according to claim 3,
the solution in the crystallization tank was a methanesulfonic acid solution used for plating a steel sheet with tin.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015192441 | 2015-09-30 | ||
| JP2015-192441 | 2015-09-30 | ||
| PCT/JP2016/004337 WO2017056472A1 (en) | 2015-09-30 | 2016-09-26 | Scraper device for crystallization tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108025222A CN108025222A (en) | 2018-05-11 |
| CN108025222B true CN108025222B (en) | 2020-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680055889.0A Active CN108025222B (en) | 2015-09-30 | 2016-09-26 | Scraper device of crystallization tank |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP6237935B2 (en) |
| KR (1) | KR102041940B1 (en) |
| CN (1) | CN108025222B (en) |
| MY (1) | MY197377A (en) |
| TW (1) | TWI701073B (en) |
| WO (1) | WO2017056472A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108994016A (en) * | 2018-07-24 | 2018-12-14 | 彭圆 | A kind of method of industry high-salt wastewater processing |
| CN112742061A (en) * | 2020-12-11 | 2021-05-04 | 安徽金禾实业股份有限公司 | Cooling device and cooling method for maltol sublimation section |
| CN115350498A (en) * | 2022-07-20 | 2022-11-18 | 徐姣姣 | Amino acid recycling system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2404451B3 (en) * | 1977-09-29 | 1980-08-08 | Duprat Jacques | |
| CN101484615A (en) * | 2006-08-21 | 2009-07-15 | 杰富意钢铁株式会社 | Apparatus for regenerating plating solution and method for regenerating plating solution |
| JP2012000651A (en) * | 2010-06-18 | 2012-01-05 | Kubota Corp | Screw press |
| JP2012246263A (en) * | 2011-05-30 | 2012-12-13 | Mitsubishi Rayon Co Ltd | Scraper unit for crystallizer of methacrylic acid, crystallizer and crystallization method |
| CN204107083U (en) * | 2014-10-11 | 2015-01-21 | 宁波大学 | A kind of sedimentation and filtration crystallization kettle |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008023778A1 (en) * | 2006-08-21 | 2008-02-28 | Jfe Steel Corporation | Plating solution regenerating apparatus and method of regenerating plating solution |
| CN201361467Y (en) * | 2008-11-03 | 2009-12-16 | 四川宜宾江源化工机械制造有限责任公司 | Scraper sleeve-type crystallizer |
| JP5394147B2 (en) | 2009-06-30 | 2014-01-22 | 三菱レイヨン株式会社 | (Meth) acrylic acid purification method |
-
2016
- 2016-09-26 CN CN201680055889.0A patent/CN108025222B/en active Active
- 2016-09-26 JP JP2016570136A patent/JP6237935B2/en active Active
- 2016-09-26 WO PCT/JP2016/004337 patent/WO2017056472A1/en active Application Filing
- 2016-09-26 KR KR1020187008467A patent/KR102041940B1/en active IP Right Grant
- 2016-09-26 MY MYPI2018700073A patent/MY197377A/en unknown
- 2016-09-30 TW TW105131597A patent/TWI701073B/en active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2404451B3 (en) * | 1977-09-29 | 1980-08-08 | Duprat Jacques | |
| CN101484615A (en) * | 2006-08-21 | 2009-07-15 | 杰富意钢铁株式会社 | Apparatus for regenerating plating solution and method for regenerating plating solution |
| JP2012000651A (en) * | 2010-06-18 | 2012-01-05 | Kubota Corp | Screw press |
| JP2012246263A (en) * | 2011-05-30 | 2012-12-13 | Mitsubishi Rayon Co Ltd | Scraper unit for crystallizer of methacrylic acid, crystallizer and crystallization method |
| CN204107083U (en) * | 2014-10-11 | 2015-01-21 | 宁波大学 | A kind of sedimentation and filtration crystallization kettle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6237935B2 (en) | 2017-11-29 |
| TWI701073B (en) | 2020-08-11 |
| WO2017056472A1 (en) | 2017-04-06 |
| CN108025222A (en) | 2018-05-11 |
| KR102041940B1 (en) | 2019-11-07 |
| JPWO2017056472A1 (en) | 2017-10-05 |
| KR20180043820A (en) | 2018-04-30 |
| MY197377A (en) | 2023-06-14 |
| TW201718069A (en) | 2017-06-01 |
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