CN115747847A - Sealing structure and method for anode lead column and anode cover plate of fluorine-making electrolytic cell - Google Patents

Abstract

The invention provides a sealing structure and a sealing method for an anode lead post and an anode cover plate of a fluorine-making electrolytic cell, which comprises a lead post body, wherein a sealing box which is integrally formed with the anode cover plate is sleeved on the outer side of the lead post body, a steel sleeve is sleeved on the outer side of the lead post body below the sealing box, an isolation pad is arranged between the steel sleeve and the sealing box, and a particle insulating substance layer, a flexible insulating substance layer and a plurality of rigid insulating substance layers are arranged in the sealing box. This seal structure between seal box and the wire post body adopts and sets up granule insulating substance layer, flexible insulating substance layer and a plurality of rigidity insulating substance layer simultaneously, and the granule material on granule insulating substance layer can carry out self-adaptation adjustment at vibrations and pressure fluctuation according to separating the groove, ensures that the electrolysis trough is under vibrations and pressure fluctuation operating mode, and seal box insulating nature, leakproofness are not destroyed, and flexible insulating substance layer has certain toughness, further guarantees the leakproofness.

Description

Sealing structure and method for anode lead post and anode cover plate of fluorine-making electrolytic cell

technical field

The invention relates to the technical field of sealing an anode lead post and an anode cover plate of a fluorine-making electrolytic cell, in particular to a sealing structure and method for an anode lead post and an anode cover plate of a fluorine-making electrolytic cell.

Background technique

The uranium purification and conversion electrolytic fluorine production line mainly uses a 10kA carbon steel fluorine electrolytic cell as the fluorine production equipment, and adopts the medium-temperature electrolytic fluorine production process commonly used at home and abroad to prepare fluorine gas. Through continuous exploration and optimization in recent years, the medium-temperature electrolytic fluorine production technology has achieved certain results, and the fluorine production capacity of the production line has met the needs of uranium purification and transformation. However, there are still problems such as frequent abnormal working conditions during the operation of the electrolytic fluorine production system. For example: the wire post catches fire, affecting the continuity and stability of the fluorine supply system. The function of the lead post is to connect and fix the fluorocarbon plate in the electrolytic cell, and the lead post is connected to the power supply for electrolysis. During the assembly process of the electrolytic cell, the airtightness and insulation of the lead post sealing box are extremely high. The insulation and sealing of the sealing box of the electrolytic cell are easily damaged under the conditions of vibration and pressure fluctuations. When the sealing of the lead post sealing box is damaged, air enters the electrolytic cell, oxygen and fluorine gas react, causing PTFE to catch fire, which will Lead to a large amount of fluorine gas leakage.

Contents of the invention

The purpose of the present invention is to provide a sealing structure and method for the anode wire column and the anode cover plate of the fluorine-making electrolytic cell, and the sealing box is filled and assembled by combining a granular insulating material layer, a flexible insulating material layer and a rigid insulating material layer For the sealing box, the insulation and sealing performance of the sealing box are improved, thereby reducing or eliminating the fire failure of the wire post.

The technical solution of the present invention provides a sealing structure between the anode lead post and the anode cover plate of the fluorine-making electrolytic cell, including the lead post body, and the outer side of the lead post body is sleeved with a sealing box integrally formed with the anode cover plate , under the sealing box, a steel sleeve is sleeved on the outer side of the wire post body, an isolation pad is provided between the steel sleeve and the sealing box, and a granular insulating material layer, a flexible insulating material layer, and a flexible insulation layer are arranged inside the sealing box. layer of material and multiple layers of rigid insulating material.

Further, the granular insulating material layer includes calcium fluoride powder layer and polytetrafluoroethylene powder layer, the flexible insulating material layer is sealing mud, and the rigid insulating material layer is polytetrafluoroethylene pad, bakelite pad or steel Quality washers.

Further, the interior of the sealed box is sequentially arranged from bottom to top as sealing mud, a first polytetrafluoroethylene pad, a first polytetrafluoroethylene powder layer, a calcium fluoride powder layer, a second polytetrafluoroethylene powder layer, Second PTFE pad, bakelite pad and steel pad.

Further, the components of the sealing putty include epoxy resin, maleic acid and phthalate.

Further, the components of the sealing putty are in parts by weight: 55-65 parts of epoxy resin, 10-20 parts of maleic acid glycerin, and 25 parts of phthalate.

Further, the components of the sealing putty are in parts by weight: 60 parts of epoxy resin, 15 parts of maleic acid, and 25 parts of phthalate.

Further, the spacer is made of polytetrafluoroethylene material, the spacer has a boss-shaped structure, and the top end of the spacer abuts against the bottom end of the sealing mud.

Further, a compression nut is installed on the top of the steel pad on the lead post body.

A method for sealing an anode lead post and an anode cover plate of a fluorine-making electrolytic cell, specifically comprising the following steps:

S1: Filter the calcium fluoride powder, put it in an oven, dry it at 100°C-120°C for 24 hours, take it out, and put it at room temperature for later use;

S2: The sealing mud is mixed with calcium fluoride powder according to the ratio of 60 parts of epoxy resin, 15 parts of maleic acid glycerin and 25 parts of phthalate;

S3: Knead the sealing mud into a round strip of φ12mm-16mm and coil it at the bottom of the inside of the sealing box, install the first polytetrafluoroethylene pad and press the sealing mud down to make the sealing mud flat, and then lay the first polytetrafluoroethylene pad in turn. Tetrafluoroethylene powder layer, calcium fluoride powder layer, second polytetrafluoroethylene powder layer, second polytetrafluoroethylene pad, bakelite pad and steel pad.

Further, in step S1, the calcium fluoride powder is filtered through a 120-mesh sieve.

The beneficial effect of the technical solution of the present invention on the prior art is: the sealing structure between the sealing box and the lead post body adopts the simultaneous arrangement of a granular insulating material layer, a flexible insulating material layer and a plurality of rigid insulating material layers, and the granular insulating material layer The granular material in the layer can be adaptively adjusted according to the vibration and pressure fluctuations of the electrolyzer to ensure that the insulation and sealing of the sealed box are not damaged under the conditions of vibration and pressure fluctuations in the electrolytic cell, and the flexible insulating material layer has a certain toughness. Guaranteed tightness.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the connection schematic diagram of lead post body and fluorocarbon plate in the present invention;

Fig. 2 is a sectional view of the sealing structure between the lead post and the anode cover plate in the present invention;

Explanation of reference signs: 1-wire post body, 2-steel sleeve, 3-sealing box, 4-isolation pad, 5-sealing mud, 6-first polytetrafluoroethylene pad, 7-first polytetrafluoroethylene powder layer, 8-calcium fluoride powder layer, 9-second polytetrafluoroethylene powder layer, 10-second polytetrafluoroethylene pad, 11-bakelite pad, 12-steel pad, 13-compression nut, 14-anode cover plate.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In describing the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", etc. or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined. In addition, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be It can be directly connected, or indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Example 1

As shown in Figures 1 and 2, a sealing structure for the anode lead post and the anode cover plate of a fluorine-making electrolytic cell includes a lead post body 1, and a seal integrally formed with the anode cover plate 14 is sleeved on the outside of the lead post body 1. Box 3, steel sleeve 2 is sleeved on the outer side of wire post body 1 below the sealing box 3, and steel sleeve 2 is screwed and connected with wire post body 1 to form a support for the sealing box 3 at its top.

In order to ensure that the insulation and sealing properties of the sealed box 3 are not damaged under the conditions of vibration and pressure fluctuations in the electrolytic cell, a layer of granular insulating material, a layer of flexible insulating material and multiple layers of rigid insulating material are arranged inside the sealed box 3. The granular insulating material The layers include calcium fluoride powder layer 8 and polytetrafluoroethylene powder layer, the flexible insulating material layer is sealing mud 5, and the rigid insulating material layer is polytetrafluoroethylene pad, bakelite pad 11 or steel washer. During specific sealing, sealing mud 5, the first polytetrafluoroethylene pad 6, the first polytetrafluoroethylene powder layer 7, calcium fluoride powder layer 8, and the second polytetrafluoroethylene pad are arranged sequentially from bottom to top inside the sealing box 3. Vinyl fluoride powder layer 9, second polytetrafluoroethylene pad 10, bakelite pad 11 and steel pad 12. A compression nut 13 is installed on the top of the steel pad 12 on the lead post body 1, which is used to compress each sealing layer inside the sealing box 3, especially to make the layer of granular insulating material more compact; a large area of calcium fluoride powder is laid inside the sealing box 3 The reason is: on the one hand, calcium fluoride powder plays the role of insulation and does not react with fluorine gas; Insulation.

Between the steel sleeve 2 and the sealing box 3, there is an isolation gasket 4 made of polytetrafluoroethylene material which plays the role of isolation and sealing. The spacer 4 is a boss-shaped structure, and the top of the spacer 4 abuts against the bottom of the sealing mud 5 .

Fully considering that the chemical properties of fluorine gas are very active and highly oxidizing, in order to make the sealing mud 5 non-reactive with fluorine gas and have certain toughness after curing at normal temperature or the operating temperature of the electrolytic cell, the present invention adopts epoxy resin, cisidine Diglycolic acid and phthalates are used to make sealing materials according to a certain ratio. Because epoxy resin has strong cohesive force and dense molecular structure, it is a beneficial and multifunctional electrical insulation material. Epoxy resin is cured Finally, it has excellent dielectric constant, adding suitable curing agent, toughening agent and solid filler, and self-curing between room temperature and 100°C, with good sealing and insulation. In addition, fully considering that the chemical properties of fluorine gas are very active, in order to make the sealing mud 5 non-reactive with fluorine gas, and to have a certain toughness after curing at room temperature or the operating temperature of the electrolytic cell, maleic acid glycerin is used as the curing agent. Phthalate is used as a toughening agent, thereby improving the shrinkage rate, strength and tolerance of sealing putty 5, the present invention selects epoxy resin, adopts glycerin maleic acid as curing agent simultaneously, and phthalate as a toughening agent.

The specific formulation studies of epoxy resin, maleic acid glycerol and phthalates are as follows:

Formula 1: 65 grams of epoxy resin, 10 grams of maleic acid, 25 grams of phthalates;

Formula 2: 60 grams of epoxy resin, 15 grams of maleic acid, 25 grams of phthalates;

Formula 3: 55 grams of epoxy resin, 20 grams of maleic acid, 25 grams of phthalates;

According to the operation verification of working conditions, the present invention adopts the sealing mud 5 made by formula 2, and its sealing performance, insulation and operating conditions are better than those of formulas 1 and 3, and its specific characteristics are as follows: it can be fully cured at operating temperature, The hardness, flexibility and surface finish meet the requirements of the working conditions; the sealing mud 5 does not react with fluorine gas and hydrogen fluoride gas before and after curing; after curing, it becomes a ceramic-like substance and sticks to the metal at the sealing place, and the sealing effect is good. During the operation period of the electrolytic cell, no fluorine gas leakage event occurs in the sealed box 3; the dielectric properties are good, the resistivity is greater than 107ΩΩm, and the resistivity of formula 1 and formula 3 are both less than 100ΩΩm.

A method for sealing the anode wire post and the anode cover plate of a fluorine-making electrolytic cell. The sealing method comprises the following steps: first, filter the calcium fluoride powder with a 120-mesh screen to make the particles of the calcium fluoride powder smaller, thereby making the fluoride The gap between the calcium powder particles is smaller and the sealing performance is good, and it is placed in an oven, dried at 100°C-120°C for 24 hours, taken out, and placed at room temperature for later use; then the sealing mud 5 is made according to 60 parts of epoxy resin, Mix the ratio of 15 parts of butyric acid glycerin and 25 parts of phthalates and mix with calcium fluoride powder; knead the sealing mud 5 into a round strip of φ12mm-16mm and coil it at the bottom of the sealing box 3 , install the first polytetrafluoroethylene pad 6 and press down the sealing mud 5, so that the sealing mud 5 forms a flat shape, and then lay the first polytetrafluoroethylene powder layer 7, calcium fluoride powder layer 8, and the second polytetrafluoroethylene powder layer in sequence. The vinyl powder layer 9, the second polytetrafluoroethylene pad 10, the bakelite pad 11 and the steel pad 12, and finally use the compression nut 13 to compress the steel pad 12.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. A sealing structure of a fluorine-making electrolytic cell anode lead post and an anode cover plate, characterized in that it comprises a lead post body, and the outer side of the lead post body is sleeved with a sealing box integrally formed with the anode cover plate, Under the sealing box, a steel sleeve is sleeved on the outside of the wire post body, an isolation pad is provided between the steel sleeve and the sealing box, and a layer of granular insulating material, a flexible insulating material layer is provided inside the sealing box. layer and multiple layers of rigid insulating material. 2. The sealing structure of the anode wire post and the anode cover plate of the fluorine-making electrolytic cell according to claim 1, wherein the granular insulating material layer comprises a calcium fluoride powder layer and a polytetrafluoroethylene powder layer, and the The flexible insulating material layer is sealing mud, and the rigid insulating material layer is polytetrafluoroethylene pad, bakelite pad or steel washer. 3. The sealing structure of the anode wire column and the anode cover plate of the fluorine-making electrolytic cell according to claim 1, characterized in that, the inside of the sealing box is sequentially arranged as sealing mud and a first polytetrafluoroethylene gasket from bottom to top , the first polytetrafluoroethylene powder layer, calcium fluoride powder layer, the second polytetrafluoroethylene powder layer, the second polytetrafluoroethylene pad, bakelite pad and steel pad. 4. the sealing structure of the anode lead post and the anode cover plate of the fluorine-making electrolytic cell according to claim 2, is characterized in that, the component of described sealing mud comprises epoxy resin, maleic acid and phthalate Formate. 5. The sealing structure of the anode lead post and the anode cover plate of the fluorine-making electrolytic cell according to claim 4, wherein the components of the sealing mud are in parts by weight: 55-65 parts of epoxy resin, followed by 10-20 parts of butyric acid, 25 parts of phthalates. 6. The sealing structure of the anode wire column and the anode cover plate of the fluorine-making electrolytic cell according to claim 5, wherein the components of the sealing mud are in parts by weight: 60 parts of epoxy resin, cisbutane 15 parts of diglycolic acid, 25 parts of phthalates. 7. The sealing structure of the anode lead post and the anode cover plate of the fluorine-making electrolytic cell according to claim 3, wherein the spacer is made of polytetrafluoroethylene material, and the spacer is a boss-shaped structure, The top end of the spacer abuts against the bottom end of the sealing mud. 8 . The sealing structure of the anode lead post and the anode cover plate of the fluorine-making electrolytic cell according to claim 3 , wherein a compression nut is installed on the top of the steel pad on the lead post body. 9. A method for sealing the anode lead post and the anode cover plate of a fluorine-making electrolytic cell, characterized in that it specifically comprises the following steps: S1: Filter the calcium fluoride powder, put it in an oven, dry it at 100°C-120°C for 24 hours, take it out, and put it at room temperature for later use; S2: The sealing mud is mixed with calcium fluoride powder according to the ratio of 60 parts of epoxy resin, 15 parts of maleic acid glycerin and 25 parts of phthalate; S3: Knead the sealing mud into a round strip of φ12mm-16mm and coil it at the bottom of the inside of the sealing box, install the first polytetrafluoroethylene pad and press the sealing mud down to make the sealing mud flat, and then lay the first polytetrafluoroethylene pad in turn. Tetrafluoroethylene powder layer, calcium fluoride powder layer, second polytetrafluoroethylene powder layer, second polytetrafluoroethylene pad, bakelite pad and steel pad. 10. The method for sealing the anode lead post and the anode cover plate of the fluorine-making electrolytic cell according to claim 9, characterized in that, in step S1, the calcium fluoride powder is filtered through a 120-mesh screen.

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