CN217628664U

CN217628664U - Novel alternating current heating electrode device of magnesium continuous refining furnace

Info

Publication number: CN217628664U
Application number: CN202221350165.8U
Authority: CN
Inventors: 周茂敬
Original assignee: Qinghai Normoon Technology Co ltd
Current assignee: Qinghai Normoon Technology Co ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-10-21
Anticipated expiration: 2032-06-01

Abstract

The utility model discloses a novel AC heating electrode device of magnesium continuous refining furnace, the device is by the molybdenum bar, the steel bar, metal composite board transition joint, the aluminium bar, aluminium meets electroplax and thermocouple sheathed tube closely to constitute, the current situation that current magnesium continuous refining furnace AC heating electrode body is big matter heavy has been solved, it is sealed to be not convenient for processing preparation and installation, it is yielding in the use, easy corrosion, drawbacks such as short-lived, the device has promoted AC heating electrode's working property greatly, to the continuous steady operation that realizes magnesium continuous refining furnace, improve the concise quality of magnesium and reduce the concise cost of magnesium and have important supporting role.

Description

Novel alternating current heating electrode device of magnesium continuous refining furnace

Technical Field

The utility model relates to a molten salt electrolysis metal magnesium production technical field, concretely relates to novel alternating current heating electrode of magnesium continuous refining furnace.

Background

In the smelting of magnesium by a molten salt electrolysis method, a magnesium continuous refining furnace is used for purifying electrolytic crude magnesium liquid before casting so as to reduce the inclusion amount in metal castings to the maximum extent. To this end, the continuous refining furnace is designed as a horizontal settler furnace, the impurities (mainly electrolyte salts, caF) ₂ MgO and iron-containing particles) to the bottom of the furnace. The magnesium continuous refining furnace can also perform good separation on metal and electrolyte. Since the metals from the electrolysis plant are contaminated with electrolytes, a continuous magnesium refining furnace must be used for the purpose of purifying the electrolytic crude magnesium bath.

The magnesium continuous refining furnace is a large-scale multi-chamber and brick-lined molten salt furnace, and the temperature of the magnesium continuous refining furnace is maintained by installing alternating-current heating electrodes on furnace walls and utilizing the resistance of electrolyte to generate heat. Each continuous magnesium refining furnace is provided with a plurality of pairs (every two pairs) of alternating-current heating electrodes, each pair of alternating-current heating electrodes is connected to an on-load alternating-current heating dry-type transformer to provide heat and keep the metal magnesium and the electrolyte in a molten state, and the electrodes are arranged on an electrolyte layer of the continuous magnesium refining furnace. About 85% of the heat generated by the positive and negative currents will concentrate at the tip portion of the electrode tip, the temperature of the electrode tip reaches 875 ℃ to maintain the temperature of the electrolyte at 750 ℃, and the ac heating electrode must dissipate the heat and maintain the high current standard, steady state, and steady flow conditions to prevent changes in operating conditions and prevent leakage of the electrolyte.

For many years, large-scale magnesium continuous refining furnace at home and abroad adopts a side-inserted steel electrode, and because the current density of the steel electrode is not too large, the conductive section and the working surface of an electrode head of the steel electrode are obviously larger, and are easy to corrode and deform in the magnesium continuous refining furnace to damage, and the damage of an alternating current heating electrode in the magnesium continuous refining furnace means the end of the service life of the magnesium continuous refining furnace. Because the replacement of the AC heating electrode is performed only when the continuous magnesium refining furnace is stopped for maintenance, the service life of the continuous magnesium refining furnace depends on the service life of the AC heating electrode. Because the service life of the overall refractory lining of the large-scale continuous magnesium refining furnace can reach five years, the development of the high-performance alternating-current heating electrode matched with the large-scale continuous magnesium refining furnace has important significance for improving the overall equipment level of the continuous magnesium refining furnace, improving the quality of magnesium products and reducing the production cost of magnesium.

Disclosure of Invention

To the defect and the problem that current continuous refining furnace AC heating electrode device of magnesium exists, the utility model provides a novel AC heating electrode device of continuous refining furnace of magnesium, the device simple structure is compact, equipment and convenient operation, has improved AC heating electrode's working property by a wide margin.

For realizing the purpose of the utility model, the utility model adopts the following technical scheme:

a new AC heating electrode device of continuous magnesium refining furnace is composed of a thick and short molybdenum rod 1, a slender molybdenum rod 2, a steel rod 3, a metal composite plate transition joint 4, an aluminum rod 5, an aluminum electric plate 6 and a thermocouple well 7; the thick and short molybdenum rods 1 are arranged at the head of the alternating current heating electrode; the aluminum electric connection plate 6 is arranged at the tail part of the alternating current heating electrode; the slender molybdenum rod 2, the steel rod 3, the metal composite plate transition joint 4, the aluminum rod 5 and the aluminum electric connection plate 6 are sequentially arranged in the middle of the alternating current heating electrode; thick short molybdenum bar 1 links to each other through threaded connection 8 between 2 with long and thin molybdenum bar, link to each other through threaded connection two 9 between long and thin molybdenum bar 2 and the rod iron 3, all adopt the opening of a slope welding mode to connect between metal composite board transition joint 4 and rod iron 3 and the aluminium bar 5, the end of aluminium bar 5 penetrates the round hole 10 of seting up on the aluminium connects the electric plate 6 and welds again, still be equipped with a plurality of bolt hole 11 on aluminium connects the electric plate 6, thermocouple well 7 inserts along the central trompil of aluminium bar 5, metal composite board transition joint 4 and rod iron 3 in proper order.

As a preferred scheme of the utility model, thick short molybdenum rod 1 and slender molybdenum rod 2 be cylindric, and thick short molybdenum rod (1) than slender molybdenum rod (2) diameter big, length short. The purity grade of the molybdenum metal is 99.95%, the melting point of the molybdenum metal is high, and the molybdenum metal is not easy to deform and is corrosion-resistant under the working condition of the magnesium continuous refining furnace.

As a preferred embodiment of the present invention, the steel rod 3 is made of stainless steel 304L, which has a high thermal diffusivity, and can rapidly dissipate the heat of the short and thick molybdenum rods 1 and the long and thin molybdenum rods 2 to maintain the high current standard of the electrode.

As an optimized scheme of the utility model, metal clad plate transition joint 4 be the three-layer metal clad plate of stainless steel 304L, thin pure titanium piece and aluminium, be convenient for control welding process condition, ensure the face of weld quality.

As a preferred embodiment of the present invention, the thick and short molybdenum rods 1 and the thin and long molybdenum rods 2 and the steel rods 3 are tightly combined by a screw thread 8 and a screw thread 9, respectively, to provide an electrical conductivity of almost 0 resistance.

As an optimized scheme of the utility model, thermowell 7 be stainless steel 304L material for installation thermocouple temperature element, the inside temperature variation of real-time supervision alternating current heating electrode can adjust alternating current heating electrode power supply parameter in view of the above, so that timely take cooling measure, prevent to leak around the electrolyte follow alternating current heating electrode because of alternating current heating electrode is overheated.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a thick short molybdenum rod 1, long and thin molybdenum rod 2, the rod iron, metal clad plate transition joint, the aluminium bar, aluminium connects electroplax and thermocouple sheathed tube's inseparable combination, the current situation that current magnesium refining furnace alternating current heating electrode body is big matter heavy has been solved, it is sealed to be not convenient for processing preparation and installation, it is yielding in the use, perishable, drawback such as short-lived, the device has promoted the working property of alternating current heating electrode greatly, to realizing the continuous steady operation of magnesium refining furnace in succession, improve the concise quality of magnesium and reduce the concise cost of magnesium and have important supporting role.

Drawings

FIG. 1 is a schematic view of the novel AC heating electrode device of the magnesium continuous refining furnace of the utility model.

FIG. 2 is a schematic diagram of the A direction of the aluminum contact plate 6 in the novel AC heating electrode device of the magnesium continuous refining furnace of the utility model.

In the figure: 1. 1, a thick and short molybdenum rod; 2. an elongated molybdenum rod 2; 3. a steel bar; 4. a metal composite plate transition joint; 5. an aluminum bar; 6. an aluminum contact plate; 7. a thermowell; 8. the first screw is connected; 9. connecting the second screw thread; 10. a circular hole; 11. bolt holes.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only some embodiments, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Examples

Referring to fig. 1 and 2, a novel ac heating electrode device for a magnesium continuous refining furnace is composed of a thick and short molybdenum rod 1, a slender molybdenum rod 2, a steel rod 3, a metal composite plate transition joint 4, an aluminum rod 5, an aluminum contact plate 6 and a thermocouple well 7; the thick and short molybdenum rods 1 are arranged at the head of the alternating current heating electrode; the aluminum electric connection plate 6 is arranged at the tail part of the alternating current heating electrode; the slender molybdenum rod 2, the steel rod 3, the metal composite plate transition joint 4, the aluminum rod 5 and the aluminum electric connection plate 6 are sequentially arranged in the middle of the alternating current heating electrode; thick short molybdenum bar 1 links to each other through threaded connection 8 between 2 with long and thin molybdenum bar, link to each other through threaded connection two 9 between long and thin molybdenum bar 2 and the rod iron 3, all adopt the opening of a slope welding mode to connect between metal composite board transition joint 4 and rod iron 3 and the aluminium bar 5, the end of aluminium bar 5 penetrates the round hole 10 of seting up on the aluminium connects the electric plate 6 and welds again, still be equipped with a plurality of bolt hole 11 on aluminium connects the electric plate 6, thermocouple well 7 inserts along the central trompil of aluminium bar 5, metal composite board transition joint 4 and rod iron 3 in proper order.

Preferably, the thick and short molybdenum rods 1 and the long and thin molybdenum rods 2 are both cylindrical, and the thick and short molybdenum rods 1 are larger in diameter and shorter in length than the long and thin molybdenum rods 2. The purity grade of the molybdenum metal is 99.95%, the melting point of the molybdenum metal is high, and the molybdenum metal is not easy to deform and is corrosion-resistant under the working condition of the magnesium continuous refining furnace.

Preferably, the material of the steel rod 3 is stainless steel 304L, which has a high thermal diffusivity and can rapidly dissipate the heat of the thick and short molybdenum rods 1 and the thin and long molybdenum rods 2 so as to maintain the high current standard of the alternating current heating electrode.

Preferably, the metal composite plate transition joint 4 is a three-layer metal composite plate made of stainless steel 304L, a thin pure titanium sheet and aluminum, so that welding process conditions can be conveniently controlled, and the quality of a welding surface can be ensured.

Preferably, the thick and short molybdenum rods 1 and the slender molybdenum rods 2 and the steel rods 3 are tightly combined through the threaded connections I8 and II 9 respectively, and the conductivity of the resistance is almost 0.

Preferably, the thermowell 7 is made of stainless steel 304L, and is used for installing a thermocouple thermometer, monitoring the temperature change inside the ac heating electrode in real time, and adjusting the power supply parameters of the ac heating electrode accordingly, so as to take cooling measures in time and prevent the electrolyte from leaking from the periphery of the ac heating electrode due to overheating of the ac heating electrode.

When the device is used, the bolt holes 11 formed in the aluminum electric-connecting plate 6 in each pair of alternating-current heating electrode devices are connected with a heating transformer bus system, when the electrolyte liquid level in the magnesium continuous refining furnace reaches a power transmission condition, power can be transmitted to the magnesium continuous refining furnace, alternating current of the alternating-current heating transformer flows through electrolyte through the bus system and the two alternating-current heating electrodes, the actual temperature value of each temperature monitoring point is compared with a set value, and the work load of the alternating-current heating electrodes is adjusted by reducing or increasing the tap set value of the transformer.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel alternating current heating electrode device of continuous refining stove of magnesium which characterized in that: the device consists of a thick and short molybdenum rod (1), a slender molybdenum rod (2), a steel rod (3), a metal composite plate transition joint (4), an aluminum rod (5), an aluminum electric connection plate (6) and a thermocouple sleeve (7); the thick and short molybdenum rods (1) are arranged at the head part of the alternating current heating electrode; the aluminum electric connection plate (6) is arranged at the tail part of the alternating current heating electrode; the slender molybdenum rod (2), the steel rod (3), the metal composite plate transition joint (4), the aluminum rod (5) and the aluminum electric plate (6) are sequentially arranged in the middle of the alternating current heating electrode; thick short molybdenum bar (1) links to each other through threaded connection (8) between long and thin molybdenum bar (2), link to each other through threaded connection two (9) between long and thin molybdenum bar (2) and rod iron (3), all adopt the open-end welding mode to connect between metal composite sheet transition joint (4) and rod iron (3) and rod iron (5), the end of rod iron (5) penetrates round hole (10) of seting up on aluminium connects electroplax (6) and welds again, still be equipped with a plurality of bolt hole (11) on aluminium connects electroplax (6), thermowell (7) insert along rod iron (5) in proper order, the central trompil of metal composite sheet transition joint (4) and rod iron (3).

2. The novel AC heating electrode device of the continuous magnesium refining furnace of claim 1, which is characterized in that: the thick and short molybdenum rods (1) and the slender molybdenum rods (2) are both cylindrical, and the thick and short molybdenum rods (1) are larger in diameter and shorter in length than the slender molybdenum rods (2).

3. The novel AC heating electrode device of the magnesium continuous refining furnace of claim 1, which is characterized in that: the steel bar (3) is made of 304L stainless steel.

4. The novel AC heating electrode device of the continuous magnesium refining furnace of claim 1, which is characterized in that: the metal composite plate transition joint (4) is a three-layer metal composite plate of stainless steel 304L, a thin pure titanium sheet and aluminum.

5. The novel AC heating electrode device of the magnesium continuous refining furnace of claim 1, which is characterized in that: the thick and short molybdenum rods (1) and the thin and long molybdenum rods (2) and the steel rods (3) are tightly combined through a first threaded connection (8) and a second threaded connection (9) respectively.

6. The novel AC heating electrode device of the magnesium continuous refining furnace of claim 1, which is characterized in that: the thermocouple sleeve (7) is made of stainless steel 304L and is used for mounting a thermocouple temperature measuring element.