CN108301014B - Method for processing connecting end of carbon anode plate - Google Patents
Method for processing connecting end of carbon anode plate Download PDFInfo
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- CN108301014B CN108301014B CN201810215226.1A CN201810215226A CN108301014B CN 108301014 B CN108301014 B CN 108301014B CN 201810215226 A CN201810215226 A CN 201810215226A CN 108301014 B CN108301014 B CN 108301014B
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- carbon anode
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/245—Fluorine; Compounds thereof
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/042—Electrodes formed of a single material
- C25B11/043—Carbon, e.g. diamond or graphene
Abstract
The invention relates to a method for processing a connecting end of a carbon anode plate, (a) selecting one end face in the length direction of the carbon anode plate as a connecting end face, and grinding a group of surfaces vertical to the thickness direction into parallel planes; (b) processing a long groove on the connecting end to form a relatively independent end connecting area; (c) a through hole is formed in the connecting end along the thickness direction; (d) carrying out ultrasonic cleaning on the connecting end of the carbon anode plate, and then drying; (e) and spraying metal on the connecting area and the side surface and the end surface of the connecting area, and polishing and flattening by adopting metallographic abrasive paper after the surface temperature of the coating is reduced to normal temperature to finish the treatment of the connecting end of the carbon anode plate. Compared with the prior art, the invention improves the surface quality of the connecting end of the carbon anode plate, reduces the contact resistance, improves the integral strength of the connecting part, is beneficial to improving the capability of resisting the end fracture of the carbon anode plate in the electrolytic process and prolongs the service life of the carbon anode plate.
Description
Technical Field
The invention belongs to the field of fluorine production by medium-temperature electrolysis, and particularly relates to a method for processing a connecting end of a carbon anode plate.
Background
Elemental fluorine is an element which is widely applied, plays an important role particularly in the fields of nuclear industry, chemical industry, electrical industry and the like, and in most applications, elemental fluorine gas is the most important raw material. At present, the medium-temperature electrolysis fluorine preparation is the most mature technology and the most widely applied elemental fluorine gas preparation technology. The medium-temperature fluorine-making electrolytic cell adopts the carbon anode plate as the fluorine-making anode, and the breakage of the connecting end of the carbon anode plate is found to be an important factor restricting the service life of the anode plate in the use process, so that the research on how to prevent or delay the cracking of the connecting end in the operation process of the electrolytic cell is of great importance.
Disclosure of Invention
The present invention is directed to a method for processing a connection end of a carbon anode plate, which can prolong the service life of the carbon anode plate.
The purpose of the invention can be realized by the following technical scheme:
a method for processing the connection end of a carbon anode plate comprises the following steps:
(a) selecting one end face of the carbon anode plate in the length direction as a connecting end face, and grinding a group of areas, which are within the range of 110mm +/-0.5 mm from the connecting end face, of the surface perpendicular to the thickness direction into a group of parallel planes;
(b) processing a long groove at a position of the connecting end, which is 100mm +/-0.5 mm away from the end face, to form a relatively independent end connecting area;
(c) a through hole is formed in the connecting end along the thickness direction;
(d) carrying out ultrasonic cleaning on the connecting end of the carbon anode plate, removing dust on the surface and in pores, and then drying;
(e) and spraying metal on the connecting area and the side surface and the end surface of the connecting area, and polishing and flattening by adopting metallographic abrasive paper after the surface temperature of the coating is reduced to normal temperature to finish the treatment of the connecting end of the carbon anode plate.
And (b) processing the parallel planes in the step (a) by adopting a plane grinder, wherein the parallelism tolerance is 0.06 mm.
And (b) processing the long groove by a diamond grinding disc by adopting a surface grinder, wherein the bottom end of the processed long groove is an 3/8 circle with the radius of 3mm +/-0.04 mm, the maximum depth of the long groove is 4.8mm +/-0.1 mm, and the maximum width of the long groove is 9.1mm +/-0.1 mm.
In addition, the sides of the connection region were chamfered to a dimension of (4 ± 0.04) mm × (4 ± 0.04) mm.
And (c) processing an arc chamfer with the diameter of 17mm +/-0.5 mm and the circumferential processing depth of the through hole of 5mm +/-0.1 mm.
And (e) spraying metal such as nickel, copper, cobalt and the like by adopting ultrasonic rapid cooling low-pressure cold spraying equipment, wherein the thickness of the coating formed by the sprayed metal is 0.2-0.3 mm, the coating is uniform, and no crack exists.
In original structure, the carbon plate surface roughness is poor, the gas pocket is many, forms the point contact with the copper surface, and contact resistance is higher, leads to the contact surface to generate heat higher, and then produces thermal stress. The existence of groove and chamfer has ensured the higher joint fastness on spraying metal level and carbon plate surface, spraying metal level thickness is 0.2mm ~ 0.3mm, certain elastic deformation can take place at the firm in-process of bolt to contact with the copper and obviously be superior to being fragile carbon plate, and the metal level conductivity can be far higher than the carbon plate, under the operating mode that switches on, the electric current distributes at the metal level preferentially, and then even conduction to carbon plate tip, current distribution is more reasonable, contact resistance is littleer, thereby reduce calorific capacity, reduce the thermal stress that the carbon plate is heated. Meanwhile, the corrosion of fluorine gas and hydrogen fluoride to the connecting end of the carbon plate is greatly weakened due to the existence of the metal layer. Both improvements contribute to the extended life of the carbon plate.
Drawings
FIG. 1 is a schematic diagram of a carbon anode plate;
FIG. 2 is a schematic front view of the structure at the connection end face;
FIG. 3 is a schematic side view of the connection end face;
fig. 4 is a schematic top view of the connecting end face.
In the figure, 1-carbon anode plate, 2-long groove, 3-connecting area and 4-through hole.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
A method for processing the connection end of a carbon anode plate comprises the following steps:
firstly, a carbon anode plate 1 with the size of 620mm long, 200mm wide and 50mm thick is produced, one end in the length direction is selected as a connecting end, and the areas, within 110mm from the end face, of a group of faces, perpendicular to the thickness direction, of the connecting end are ground into a group of parallel planes; then, milling a long groove 2 at a position 100mm away from the end face to form a relatively independent end connecting area 3, wherein the bottom end of the groove is an 3/8 circle with the radius of 3mm, the maximum depth of the groove is 4.8mm, and the maximum width of the groove is 9.1 mm; thirdly, processing a chamfer with the size of 4mm multiplied by 4mm in the connecting area; fourthly, machining a phi 17 through hole 4 in the thickness direction at the connecting end, and machining an arc chamfer at the circumference of the through hole by using a phi 25 spherical grinding head, wherein the chamfer depth is 5 mm; fifthly, carrying out ultrasonic cleaning on the connecting end part, removing dust on the surface and in pores, and then drying at 150 ℃; finally, spraying metal on the connecting area, the chamfer and the end face by using ultrasonic quick-cooling low-pressure cold spraying equipment, repeatedly and uniformly spraying for 3 times to enable the final thickness of the coating to be 0.2mm, and after the surface temperature of the coating is reduced to normal temperature, polishing and flattening by using metallographic abrasive paper to finally obtain the carbon anode plate with the structure shown in figure 1 and the structure at the connecting end face shown in figures 2-4.
Example 2
A method for processing the connection end of a carbon anode plate comprises the following steps:
(a) selecting one end face of the carbon anode plate in the length direction as a connecting end face, grinding a group of areas with the surface distance of 110mm from the connecting end face in the thickness direction, wherein the error can be controlled within the range of +/-0.5 mm into a group of parallel planes, and processing the parallel planes by adopting a plane grinder, wherein the parallelism tolerance is 0.06 mm;
(b) processing an elongated slot at a position 100mm away from the end face of the connecting end, wherein the error can be controlled to be +/-0.5 mm, forming a relatively independent end connecting area, processing the elongated slot by using a surface grinding machine, wherein the elongated slot is obtained by processing a diamond grinding disc, the bottom end of the processed elongated slot has a radius of 3mm, the error can be controlled to be +/-0.04 mm of 3/8 circles, the maximum depth of the elongated slot is 4.8mm, the error can be controlled to be +/-0.1 mm, the maximum width of the elongated slot is 9.1mm, the error can be controlled to be +/-0.1 mm, chamfering is carried out on each side of the connecting area, the chamfer size is 4mm multiplied by 4mm, and the error can be controlled to be +/-0.;
(c) arranging a through hole with the diameter of 17mm and the error of +/-0.5 mm on the connecting end along the thickness direction, and processing an arc chamfer with the circumferential depth of 5mm and the error of +/-0.1 mm on the through hole;
(d) carrying out ultrasonic cleaning on the connecting end of the carbon anode plate, removing dust on the surface and in pores, and then drying;
(e) and spraying metal nickel, copper, cobalt and the like on the connecting area and the side surfaces and end surfaces of the connecting area, wherein the thickness of the formed coating is 0.3mm, the coating is uniform and has no crack, and after the surface temperature of the coating is reduced to normal temperature, the connecting end of the carbon anode plate is polished to be flat by adopting metallographic abrasive paper, so that the treatment on the connecting end of the carbon anode plate is completed.
Tests show that when the bolt torque is 29 N.m, after the metal layer is sprayed, the contact resistance is reduced by 89.5 percent, which is close to the contact resistance when the bolt torque is 90 N.m in the original structure, so that the contact resistance can be reduced without adopting a method for increasing the bolt torque, and according to the tests, the bolt torque is only 50 N.m, so that the compressive stress borne by the carbon plate is reduced.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. A method for processing the connecting end of a carbon anode plate is characterized by comprising the following steps:
(a) selecting one end face of the carbon anode plate (1) in the length direction as a connecting end face, and grinding a group of areas, which are perpendicular to the thickness direction and have the surface distance of 110mm +/-0.5 mm, of the connecting end face into a group of parallel planes;
(b) processing an elongated slot (2) at a position 100mm +/-0.5 mm away from a connecting end surface to form a relatively independent end connecting area (3), and chamfering each side of the connecting area (3);
(c) a through hole (4) is arranged on the connecting end along the thickness direction;
(d) carrying out ultrasonic cleaning on the connecting end of the carbon anode plate (1), and then drying;
(e) and (3) spraying metal on the connecting area (3) and the side surface and the end surface of the area, and after the surface temperature of the coating is reduced to normal temperature, polishing and flattening by adopting metallographic abrasive paper to finish the treatment of the connecting end of the carbon anode plate.
2. The method as claimed in claim 1, wherein the parallel planes of step (a) are processed by a surface grinder with a parallelism tolerance of 0.06 mm.
3. The method for treating the connection end of the carbon anode plate according to claim 1, wherein the long groove (2) in the step (b) is obtained by processing a diamond grinding disc by using a surface grinder.
4. The method as claimed in claim 1, wherein the chamfer size is (4 ± 0.04) mm x (4 ± 0.04) mm.
5. The method for processing the connecting end of the carbon anode plate according to claim 1 or 3, wherein the bottom end of the long groove (2) is an 3/8 circle with a radius of 3mm +/-0.04 mm, the maximum depth of the long groove (2) is 4.8mm +/-0.1 mm, and the maximum width is 9.1mm +/-0.1 mm.
6. The method for treating the connection end of a carbon anode plate according to claim 1, wherein the diameter of the through-hole (4) in the step (c) is 17mm ± 0.5 mm.
7. The method for processing the connection end of the carbon anode plate according to claim 1 or 6, wherein the circumference of the through hole (4) is further processed with an arc chamfer with a chamfer depth of 5mm ± 0.1 mm.
8. The method as claimed in claim 1, wherein the step (e) of coating metal with ultra-sonic rapid cooling low-pressure cold spray equipment.
9. The method for treating the connection end of a carbon anode plate according to claim 1 or 8, wherein the metal sprayed in the step (e) forms a coating having a thickness of 0.2mm to 0.3 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810215226.1A CN108301014B (en) | 2018-03-15 | 2018-03-15 | Method for processing connecting end of carbon anode plate |
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| CN201810215226.1A CN108301014B (en) | 2018-03-15 | 2018-03-15 | Method for processing connecting end of carbon anode plate |
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| CN108301014A CN108301014A (en) | 2018-07-20 |
| CN108301014B true CN108301014B (en) | 2020-08-11 |
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| CN109208023B (en) * | 2018-11-16 | 2021-03-30 | 核工业第八研究所 | Bridging board combined mechanism for prolonging service life of carbon anode |
| CN109487296B (en) * | 2018-11-16 | 2021-03-16 | 核工业第八研究所 | Flexible bridging board for connecting conductive columns |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200992578Y (en) * | 2006-11-30 | 2007-12-19 | 国营八一四厂 | 10kA carbon steel medium temperature fluorine preparation electrolytic tank |
| CN102337491A (en) * | 2011-10-28 | 2012-02-01 | 核工业理化工程研究院华核新技术开发公司 | Thermal spraying processing method for carbon anode used for preparing fluorine |
| CN104532289A (en) * | 2015-01-07 | 2015-04-22 | 黎明化工研究设计院有限责任公司 | Anode for electrolysis fluorine preparation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3981783A (en) * | 1975-06-23 | 1976-09-21 | Phillips Petroleum Company | Electrochemical fluorination process utilizing excess current and hydrogen addition |
| US5756230A (en) * | 1996-06-20 | 1998-05-26 | Valence Technology, Inc. | Fluoropolymer blends for polymeric electrolyte and electrodes |
| JP2000087275A (en) * | 1998-09-11 | 2000-03-28 | Toto Ltd | Carbonic acid forming electrolytic device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200992578Y (en) * | 2006-11-30 | 2007-12-19 | 国营八一四厂 | 10kA carbon steel medium temperature fluorine preparation electrolytic tank |
| CN102337491A (en) * | 2011-10-28 | 2012-02-01 | 核工业理化工程研究院华核新技术开发公司 | Thermal spraying processing method for carbon anode used for preparing fluorine |
| CN104532289A (en) * | 2015-01-07 | 2015-04-22 | 黎明化工研究设计院有限责任公司 | Anode for electrolysis fluorine preparation |
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