CN118361950A - A vertical tank reduction furnace for producing magnesium metal - Google Patents

Abstract

A vertical tank reducing furnace for producing magnesium metal belongs to the technical field of reducing furnaces for producing magnesium metal, and comprises a vertical tank, wherein the vertical tank comprises a straight cylindrical tank body, the vertical tank reducing furnace further comprises a bin assembly, the bin assembly comprises a straight cylindrical upper bin body and a lower bin body, the upper bin body and a base are lifted and moved relative to the lower bin body, and the outer diameter of the upper bin body is smaller than the inner diameter of the vertical tank. According to the invention, the bottom of the vertical tank is set to be of a bottom straight-mouth structure, and the lifting bin assembly is matched, so that centralized material preparation is realized, the problem of unorganized discharge of workshop smoke and dust during loading and unloading of the existing vertical tank reduction furnace is solved, and the continuous, stable and environment-friendly production of the magnesium metal vertical tank reduction furnace is improved.

Description

A vertical tank reduction furnace for producing magnesium metal

Technical Field

The invention belongs to the technical field of reduction furnaces for producing metallic magnesium, and in particular relates to a vertical tank reduction furnace for producing metallic magnesium.

Background technique

Magnesium is an alkaline earth metal with active chemical properties. In industry, the methods for smelting magnesium metal include thermal reduction, electrolysis, electric melting, gas phase metallurgy and solvent metallurgy. Among them, thermal reduction is the mainstream smelting method. Thermal reduction magnesium smelting mainly refers to the Pijiang method. The traditional Pijiang method for magnesium smelting uses a horizontal tank reduction furnace. The horizontal tank of the reduction furnace is placed horizontally inside the furnace. During production, the pellets are added to the horizontal tank, and then the pellets are reduced at a temperature of 1200°C. When the reaction is completed, the slag inside the tank needs to be removed after the crystallizer is taken out. Since the horizontal tank can only be manually slag-scraped, the continuity of horizontal tank production is extremely poor. Affected by high temperature and dust, the slag-scraping operation environment is very harsh. In addition, since the horizontal tank is affected by the high temperature environment for a long time, it is very easy to bend downward when the span of the horizontal tank is large. Therefore, the horizontal tank structure not only affects the service life of the tank body, but also is not conducive to the large-scale development of the tank body and the improvement of equipment production capacity.

The vertical tank reduction furnace solves the problems existing in the above-mentioned horizontal tank reduction furnace and has been successfully applied in industrial production. The existing vertical tank reduction furnace is shown in Figure 1-3. The vertical tank 6 is composed of an upper vacuum device 6-1, a cooling water jacket 6-2, a tank body 6-3, a lower reducer 6-4 and a slag outlet 6-5. The central tube 9 is located inside the vertical tank 6. When loading the furnace, a crane is used to load the pellet material 8 into the cavity between the vertical tank 6 and the central tube 9. High-temperature flue gas and dust overflow from the upper part of the vertical tank 6 in large quantities, quickly and unorganized. When unloading, a crane is used to lift the central tube 9, and the slag outlet 6-5 is opened at the same time, and the slag flows downward. At this time, high-temperature flue gas and dust overflow from the upper part of the vertical tank 6 in large quantities, quickly and unorganized. The above-mentioned loading and unloading operations deteriorate the workshop working environment. In addition, due to the adhesion of the slag at high temperature, the vertical tank 6 and the central tube 9 are adhered to each other, making it impossible to pull out the central tube 9. The vertical tank 6, the central tube 9 and the slag need to be lifted out and replaced with new vertical tanks 6 and central tubes 9. This will not only affect the production continuity of the vertical tank reduction furnace, but also shorten the service life of the vertical tank.

On the other hand, when the central tube 9 is lifted out to discharge the slag, the furnace cover on the top of the vertical tank cannot be closed, and high-temperature flue gas and dust overflow from the upper part. At the same time, when loading, the material falls into the vertical tank, and high-temperature flue gas and dust also overflow from the upper part. The production and operating environment of the workshop is poor. Due to the complex structure of the furnace top and the existence of an overhead crane operation, the conditions for collecting and treating flue gas and dust are not met.

Summary of the invention

In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a vertical tank reduction furnace for producing metallic magnesium. By setting the bottom of the vertical tank as a bottom straight-mouth structure and cooperating with a liftable silo assembly, centralized material preparation is achieved, thereby solving the problem of unorganized emissions of workshop smoke and dust during loading and unloading of the current vertical tank reduction furnace, and improving the continuous, stable and environmentally friendly production of the metallic magnesium vertical tank reduction furnace.

In order to achieve the above object, the main technical solutions adopted by the present invention include:

A vertical tank reduction furnace for producing metallic magnesium comprises a vertical tank, the vertical tank comprises a straight cylindrical tank body, the bottom of the tank body is a bottom straight opening with the same inner diameter as the inner diameter of the upper tank body, the vertical tank reduction furnace also comprises a silo assembly, the silo assembly comprises a straight cylindrical upper silo body and a lower silo body, the bottom of the upper silo body is provided with a base, the lower silo body is sleeved on the outside of the upper silo body and the base, the upper silo body and the base are lifted and moved relative to the lower silo body, the outer diameter of the upper silo body is smaller than the inner diameter of the vertical tank, during production, a central tube is arranged inside the upper silo body, pellet material is filled between the outer wall of the central tube and the inner wall of the upper silo body, the silo assembly is placed at the bottom of the vertical tank, when the upper silo body and the base are lifted upward relative to the lower silo body, the upper silo body is placed in the vertical tank, after production is completed, the upper silo body descends to the inside of the lower silo body.

Furthermore, a fiber pad with an annular groove is provided at the bottom inner side of the upper warehouse body, the diameter of the annular groove matches the diameter of the central tube, and when the central tube is placed inside the upper warehouse body, the bottom of the central tube is placed in the annular groove of the fiber pad.

Furthermore, a seal is arranged between the base and the lower warehouse body, and the upper warehouse body is lifted and moved relative to the lower warehouse body by a pneumatic lifting device.

Furthermore, a base neck is formed at one end of the base close to the upper storage body, and the base neck is an annular groove recessed toward the longitudinal center axis of the base. A fiber sealing ring is provided in the base neck. When the upper storage body is placed in the vertical tank, the fiber sealing ring seals the gap between the vertical tank and the base.

Furthermore, the base is a hollow structure.

Furthermore, the silo assembly is sent into or out of the bottom of the vertical tank via a track mechanism.

The beneficial effects of the present invention are as follows: the magnesium metal vertical tank reduction furnace of the present invention realizes the loading and unloading operations by setting the bottom of the vertical tank as a straight bottom mouth, and coordinating the lifting of the upper bin body in the silo assembly. The loading and unloading process is short and does not generate dust, thereby improving the production continuity and stability of the vertical tank reduction furnace and greatly improving the working environment. The materials are centrally prepared before loading the furnace, and the materials can be centrally discharged after being discharged, which solves the problem of unorganized workshop smoke and dust emissions during the current vertical tank reduction furnace loading and unloading. The high-temperature materials when discharged can also be recycled by using a waste heat recovery device during centralized discharge. By providing a fiber mat, the bonding problem between the vertical tank and the center tube is avoided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of an existing vertical tank reduction furnace;

FIG2 is a schematic diagram of the structure of a vertical tank in an existing vertical tank reduction furnace;

FIG3 is a schematic diagram of the structure of a central tube in an existing vertical tank reduction furnace;

FIG4 is a schematic diagram of the structure of a vertical tank reduction furnace according to the present invention;

FIG5 is a schematic diagram of the structure of a vertical tank in a vertical tank reduction furnace of the present invention;

FIG6 is a schematic diagram of the structure of the silo assembly when the upper silo body of the present invention is raised;

FIG. 7 is a schematic diagram of the structure of the silo assembly when the upper silo body of the present invention is lowered.

In the figure: 1. furnace roof; 2. furnace chamber; 3. burner head; 4. regenerative burner; 5. furnace bottom; 6. vertical tank; 6-1. vacuum device; 6-2. cooling water jacket; 6-3. tank body; 6-4. lower reducer; 6-5. slag outlet; 6-6. bottom straight outlet; 7. crystallizer; 8. pellet material; 9. center tube; 9-1. escape outlet; 9-2. tube body; 10. silo assembly; 10-1. upper silo body; 10-2. base neck; 10-3. base; 10-4. lower silo body; 11. steel column; 12. fiber mat; 13. fiber sealing ring; 14. track mechanism.

Detailed ways

In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

A vertical tank reduction furnace for producing magnesium metal, as shown in FIG4, includes a vertical tank 6, which is placed inside a furnace 2, the top of the furnace 2 is a furnace top 1, the two sides of the furnace 2 are furnace heads 3, a plurality of regenerative burners 4 are arranged on the furnace head 3, the bottom of the furnace 2 is a furnace bottom 5, the bottom of the furnace bottom 5 is fixedly connected to a steel column 11, a crystallizer 7 is arranged inside the vertical tank 6, and a vacuum device 6-1 and a cooling water jacket 6-2 are arranged on the upper part of the vertical tank 6. As shown in FIG5, the vertical tank 6 includes a straight cylindrical tank body 6-3, and the bottom of the tank body 6-3 is a bottom straight mouth 6-6 with an inner diameter the same as the inner diameter of the upper tank body. The vertical tank reduction furnace also includes a silo assembly 10, which includes an upper silo body 10-1 and a lower silo body 10-4 in a straight cylindrical shape. A base 10-3 is formed at the bottom of the upper silo body 10-1, and the lower silo body 10-4 is sleeved on the outer portion of the upper silo body 10-1 and the base 10-3. The upper silo body 10-1 and the base 10-3 can be lifted and moved relative to the lower silo body 10-4, and the outer diameter of the upper silo body 10-1 is smaller than the inner diameter of the vertical tank 6. Specifically, the base 10-3 and the lower silo body 10-4 are sealed, and the upper silo body 10-1 can be lifted and moved relative to the lower silo body 10-4 by a pneumatic lifting device. The pneumatic lifting device inflates or deflates the lower silo body 10-4 to enable the upper silo body 10-1 to rise or fall. The state of the upper warehouse body 10-1 when it is raised is shown in FIG6 , and the state of the upper warehouse body 10-1 when it is lowered is shown in FIG7 . Specifically, the base 10-3 is formed with a base neck 10-2 at one end close to the upper warehouse body 10-1, and the base neck 10-2 is an annular groove recessed toward the longitudinal center axis of the base 10-3. A fiber sealing ring 13 is provided inside the base neck 10-2. When the upper warehouse body 10-1 is placed in the vertical tank 6, the fiber sealing ring 13 seals the gap between the vertical tank 6 and the base 10-3 to reduce the heat loss inside the vertical tank 6. Specifically, the base 10-3 can be a hollow structure, so as to reduce the weight and manufacturing cost of the base 10-3 while ensuring its basic strength.

During production, a central tube 9 is arranged inside the upper warehouse body 10-1. As shown in FIG3 , the central tube 9 includes a tube body 9-2, and the tube body 9-2 is provided with an escape port 9-1 for magnesium vapor. The space between the outer wall of the central tube 9 and the inner wall of the upper warehouse body 10-1 is filled with pellet material 8. In order to limit the position of the central tube 9 inside the upper warehouse body 10-1 and to facilitate the separation of the central tube 9 from the upper warehouse body 10-1 after production, a fiber mat 12 with an annular groove is arranged at the bottom of the inner side of the upper warehouse body 10-1. The diameter of the annular groove matches the diameter of the central tube 9. When the central tube 9 is placed inside the upper warehouse body 10-1, the bottom of the central tube 9 is placed in the annular groove of the fiber mat 12. The silo assembly 10 is placed at the bottom of the vertical tank 6. When the upper silo 10-1 and the base 10-3 are raised relative to the lower silo 10-4, the upper silo 10-1 is placed in the vertical tank 6 so that the pellet material 8 is located in the furnace 2. The base 10-3 is placed at the furnace bottom 5. After the production is completed, the upper silo 10-1 is lowered to the inside of the lower silo 10-4. The silo assembly 10 can be sent into or out of the bottom of the vertical tank 6 through the track mechanism 14 to realize the transportation of the silo assembly 10.

The method for producing magnesium metal using the reduction furnace of the present invention comprises the following steps:

Step S01, set a fiber sealing ring 13 in the base neck 10-2, assemble the upper silo body 10-1 inside the lower silo body 10-4, and place the assembled silo assembly 10 at the loading and unloading station.

Step S02, the center tube 9 is placed in the annular groove of the fiber mat 12, and the center tube 9 together with the fiber mat 12 are loaded into the upper silo body 10-1 of the silo assembly 10 located at the loading and unloading station, and the pellet material 8 is loaded into the cavity between the upper silo body 10-2 and the center tube 9.

Step S03, install the crystallizer 7 on the top of the vertical tank 6, and cover the top of the vertical tank 6; the track mechanism 14 drives the prepared silo assembly 10 to the working position, that is, directly below the vertical tank 6, and adopts a pneumatic lifting device to raise the upper silo body 10-2 to the inside of the vertical tank 6, so that the pellet material 8 is located in the furnace 2, and the base 10-3 is placed at the furnace bottom 5, entering the production state.

Step S04, after the production cycle is completed, open the furnace cover on the top of the vertical tank 6 and take out the crystallizer 7; use a pneumatic lifting device to lower the upper bin body 10-2 from the inside of the vertical tank 6 to the lower bin 10-4; the track mechanism 14 drives the bin assembly 10 to the loading and unloading station to perform unloading operations under closed conditions.

The magnesium vertical tank reduction furnace of the present invention realizes the loading and unloading operation by setting the bottom of the vertical tank 6 as a bottom straight mouth 6-6 and coordinating the lifting of the upper bin body 10-1 in the bin assembly 10. The loading and unloading process is short and does not generate dust, thereby improving the production continuity of the vertical tank reduction furnace and greatly improving the working environment. The loading and unloading operations are all centrally processed in a specific workshop, and the high-temperature materials when discharged from the furnace can also be recycled by using a waste heat recovery device during centralized unloading. By setting the fiber mat 12, the bonding problem between the vertical tank 6 and the central tube 9 is avoided.

Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Alterations, modifications, substitutions and variations of the above embodiments by a person skilled in the art are all within the scope of the present invention.

Claims (6)

1. A vertical tank reduction furnace for producing magnesium metal, comprising a vertical tank (6), characterized in that: the vertical tank (6) comprises a straight cylindrical tank body (6-3), the bottom of the tank body (6-3) is a bottom straight opening (6-6) having an inner diameter that is the same as the inner diameter of the upper tank body, the vertical tank reduction furnace also comprises a silo assembly (10), the silo assembly (10) comprises a straight cylindrical upper silo body (10-1) and a lower silo body (10-4), the bottom of the upper silo body (10-1) is provided with a base (10-3), the lower silo body (10-4) is sleeved on the outside of the upper silo body (10-1) and the base (10-3), the upper silo body (10-1) and the base (10-3) are provided with a base (10-4), and the upper silo body (10-1) and the base (10-3) are provided with a base (10-3) at the bottom of the upper silo body (10-1). 3) The upper silo (10-1) moves up and down relative to the lower silo (10-4), the outer diameter of the upper silo (10-1) is smaller than the inner diameter of the vertical tank (6), during production, a central tube (9) is arranged inside the upper silo (10-1), and the space between the outer wall of the central tube (9) and the inner wall of the upper silo (10-1) is filled with pellet material (8), the silo assembly (10) is placed at the bottom of the vertical tank (6), when the upper silo (10-1) and the base (10-3) rise upward relative to the lower silo (10-4), the upper silo (10-1) is placed in the vertical tank (6), so that the pellet material (8) is located in the furnace (2), and after production is completed, the upper silo (10-1) descends to the inside of the lower silo (10-4). 2. A vertical tank reduction furnace for producing magnesium metal according to claim 1, characterized in that: a fiber mat (12) with an annular groove is provided at the bottom inner side of the upper bin body (10-1), the diameter of the annular groove matches the diameter of the center tube (9), and when the center tube (9) is placed inside the upper bin body (10-1), the bottom of the center tube (9) is placed in the annular groove of the fiber mat (12). 3. A vertical tank reduction furnace for producing magnesium metal according to claim 1, characterized in that: the base (10-3) and the lower bin (10-4) are sealed, and the upper bin (10-1) is lifted and moved relative to the lower bin (10-4) by a pneumatic lifting device. 4. A vertical tank reduction furnace for producing magnesium metal according to claim 3, characterized in that: a base neck (10-2) is formed at one end of the base (10-3) close to the upper storage body (10-1), and the base neck (10-2) is an annular groove recessed toward the longitudinal center axis of the base (10-3), and a fiber sealing ring (13) is provided in the base neck (10-2), and when the upper storage body (10-1) is placed in the vertical tank (6), the fiber sealing ring (13) seals the gap between the vertical tank (6) and the base (10-3). 5. The vertical tank reduction furnace for producing metallic magnesium according to claim 3, characterized in that: the base (10-3) is a hollow structure. 6. A vertical tank reduction furnace for producing magnesium metal according to claim 1, characterized in that the silo assembly (10) is transported into or out of the bottom of the vertical tank (6) via a track mechanism (14).