Bottom deslagging mechanism of vertical magnesium reduction furnace and operation method

Abstract

The invention relates to the technical field of magnesium reduction furnaces, in particular to a bottom deslagging mechanism of a vertical magnesium reduction furnace and an operation method.The deslagging mechanism comprises a reduction tank body, a reduction tank bottom cover, a cover turning mechanism and a center pipe support, the reduction tank body is a cylindrical tank body, and the reduction tank bottom cover is matched with the bottom face of the reduction tank body; the cover turning mechanism is connected with the reduction tank body and the reduction tank bottom cover, the cover turning mechanism is used for controlling opening and closing of the reduction tank bottom cover, and the center pipe support is arranged in the reduction tank body and used for bearing a center pipe. By arranging the reduction tank bottom cover and the cover turning mechanism, vertical discharging is achieved, force in the horizontal direction cannot be generated between reducing slag, and the problem that a discharging port is blocked due to mutual extrusion and balance of caked reducing slag during discharging is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of magnesium reduction furnaces, and particularly to a bottom slag discharging mechanism and an operation method for a vertical magnesium reduction furnace. Background Art

[0002] At present, the main method for magnesium smelting in China is the Pidgeon process. Using calcined dolomite, ferrosilicon and fluorite as raw materials, the raw materials are put into a reduction tank, evacuated and heated at high temperature. The raw materials undergo a solid-phase reduction reaction in a high-temperature environment to generate magnesium vapor, and the magnesium vapor cools and crystallizes in the condensation area to obtain crystalline magnesium. For the reduction tanks used in the Pidgeon process for magnesium smelting, the current mainstream layout method is a vertical layout. To make the raw materials in the reduction tank heated evenly and improve the reduction efficiency, a central tube is usually arranged in the center of the reduction tank, so that the raw materials are arranged against the tube wall in the reduction tank. At the same time, the bottom of the reduction tank is made into a conical necking, and the central tube is located on the bottom conical surface, sealing the bottom discharge port so that the raw materials will not flow out from the bottom of the reduction tank. After the reduction reaction is completed, the central tube is lifted, and the reacted reduction slag flows out along the bottom discharge port to achieve slag discharging.

[0003] However, the raw materials themselves are large spherical particles, and the reduction slag formed after participating in the reduction reaction in the reduction tank will agglomerate. The conical necking of the reduction tank makes the area of the discharge port smaller than the cross-sectional area of the reduction tank. Therefore, after the central tube is lifted and the agglomerated reduction slag converges from all around to the center and discharges downward, the agglomerated reduction slag will squeeze and balance each other to block the discharge port, resulting in unsmooth slag discharging and slag blocking. At this time, it is necessary to manually penetrate the material at the discharge port. The specific operation process is that the on-site workers use a steel rod to poke the material upward from the discharge port to break the balance state of the reduction slag. However, the length of the steel rod, the operation length and strength of the workers are all limited, and it can only effectively dredge the blockage at the discharge port. If the blockage occurs at the upper end of the conical necking, it is difficult to dredge. Moreover, the reduction slag still has a certain residual temperature and will quickly discharge during the dredging moment. Therefore, the operation process of manual material penetration has a high risk factor.

[0004] In addition, the traditional slag discharging operation requires the central tube to be lifted first before slag discharging. However, before the reduction slag is discharged, a large frictional force is likely to be generated between the central tube, the reduction slag and the inner wall of the reduction tank, resulting in the inability to pull out the central tube. Sometimes, the entire reduction tank will even be pulled up, causing great difficulties to the workers' work. Summary of the Invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a bottom slag discharging mechanism and an operation method for a vertical magnesium reduction furnace. By setting a bottom cover and a flip mechanism for the reduction tank, vertical discharging is achieved, and no horizontal force is generated between the reduction slags, solving the problem of blockage of the discharge port caused by the mutual extrusion and balance of the agglomerated reduction slags during discharging.

[0006] To achieve the above object, the main technical solutions adopted by the present invention include: A vertical slag discharging mechanism at the bottom of a magnesium reduction furnace, comprising a reduction tank body, a reduction tank bottom cover, a flap mechanism and a central pipe support. The reduction tank body is a cylindrical tank body. The reduction tank bottom cover matches the bottom surface of the reduction tank body. The flap mechanism is connected to the reduction tank body and the reduction tank bottom cover. The flap mechanism is used to control the opening and closing of the reduction tank bottom cover. The central pipe support is arranged inside the reduction tank body and is used to carry the central pipe.

[0007] By setting the reduction tank bottom cover and the flap mechanism, vertical discharging is realized, and no horizontal force is generated between the reduction slags, solving the problem of blockage of the discharging port caused by the mutual extrusion and balance of the agglomerated reduction slags during discharging. Thus, there is no need for manual material penetration, ensuring the safety of workers.

[0008] At the same time, a central pipe support is also set. When using this slag discharging mechanism, there is no need to extract the central pipe, avoiding the problem that the central pipe is difficult to extract. At the same time, since the step of extracting the central pipe is cancelled, the operation process of workers is reduced, making the discharging efficiency of the reduction furnace higher and the continuity better.

[0009] Further, the flap mechanism includes a first ear part, a second ear part, a bottom cover carrier and an actuator. The first ear part is arranged in the middle of the outer wall of the reduction tank body. The second ear part is arranged at the lower part of the outer wall of the reduction tank body. The bottom cover carrier is fixedly connected to the reduction tank bottom cover and is rotationally connected to the second ear part and the actuator. The actuator is rotationally connected to the first ear part. The actuator has a telescopic stroke. When it extends, the reduction tank bottom cover moves away from directly below the reduction tank body. When it contracts, the reduction tank bottom cover tightly buckles the reduction tank body.

[0010] Further, the first ear part includes a pair of parallel first fixed ears. A horizontal first rotating shaft is arranged between the pair of first fixed ears. The second ear part includes a pair of parallel second fixed ears. A horizontal second rotating shaft is arranged between the pair of second fixed ears. The first ear part and the second ear part are respectively arranged on both sides of the reduction tank body. One end of the actuator is rotationally connected to the first rotating shaft, and the other end is rotationally connected to the bottom cover carrier. The bottom cover carrier is rotationally connected to the second rotating shaft.

[0011] Further, the bottom cover carrier is U-shaped. The two ends of the top of the bottom cover carrier are respectively connected to the first rotating shafts at a pair of first fixed ears. The inner side of the bottom of the bottom cover carrier is fixedly connected to the reduction tank bottom cover. The actuator is a pair. One ends of the pair of actuators are respectively rotationally connected to the first rotating shafts at a pair of first fixed ears, and the other ends of the pair of actuators are respectively rotationally connected to both sides of the bottom cover carrier.

[0012] By setting the specific structure of the flap mechanism, more efficient operation of the flap is realized.

[0013] Furthermore, the central tube support is in a cross shape, the four endpoints of the cross are connected to the inner wall of the reduction tank body, a limiting portion is provided at the center of the cross, the outer peripheral surface of the limiting portion is a trumpet shape with the small end facing upward, the diameter of the small end of the limiting portion is smaller than the diameter of the central tube, and the diameter of the large end of the limiting portion is greater than or equal to the diameter of the central tube.

[0014] By setting the specific structure of the central tube support, the actual area of ​​the central tube support can be reduced as much as possible while maintaining the stability of itself and the central tube. The gap of the cross-shaped central tube support is larger than the cross section of the reduction slag agglomeration, so that the reduction slag can be discharged smoothly through the central tube support.

[0015] Furthermore, the cross section of the limiting portion is cross-shaped.

[0016] By setting the cross section of the limiting portion to a cross shape, stable support for the central tube is achieved.

[0017] Furthermore, the bottom cover of the reduction tank is provided with a sealing ring.

[0018] The sealing performance of the bottom cover of the reduction tank is enhanced by providing a sealing ring.

[0019] Furthermore, the flap mechanism is connected to the reduction furnace control system.

[0020] By connecting the flap mechanism to the reduction furnace control system, the opening and closing of the bottom cover of the reduction tank can be remotely controlled, eliminating the need for manual opening of the cover on site and avoiding safety hazards.

[0021] An operating method for a bottom slag discharge mechanism of a vertical magnesium reduction furnace comprises the following steps: S1. Close the bottom cover of the reduction tank and place the central tube on the central tube support; S2, adding reducing slag into the gap between the reducing tank and the central tube, and filling the reducing slag until it covers the low temperature area of ​​the reducing furnace; S3, adding raw materials above the reduction slag and starting the reduction reaction; S4. After the reduction reaction is completed, the bottom cover of the reduction tank is opened, and a transport device is used to receive the reduction slag that has not participated in the reaction in step S2 and the reduction slag formed after the reduction reaction of the raw materials in step S3.

[0022] In a conventional vertical magnesium reduction furnace, the part of the reduction tank exposed from the furnace body is a low-temperature zone. When the raw materials are filled for reduction reaction, magnesium is easy to crystallize and agglomerate at the bottom of the reduction tank, causing blockage. In addition, since the low-temperature zone will not be heated, the insufficient temperature makes it difficult for the raw materials to fully undergo reduction reaction, resulting in waste. In step S03, the low-temperature zone of the reduction furnace is covered with reducing slag, which will not participate in the reduction reaction, thereby paving the bottom of the reduction tank body with reducing slag. Combined with the vertical discharge of the discharge mechanism, the blockage problem caused by the crystallization and agglomeration of magnesium at the bottom of the reduction tank and the waste of raw materials are solved.

[0023] The beneficial effects of the present invention are as follows: For the bottom slag discharging mechanism of the vertical magnesium reduction furnace of the present invention, the conical closing at the bottom of the reduction tank is cancelled. By setting the bottom cover and the flip cover mechanism of the reduction tank, vertical discharging is realized, and no horizontal force is generated between the reduced slag, solving the problem of blockage of the discharging port caused by the mutual extrusion and balance of the agglomerated reduced slag during discharging. Thus, manual material penetration is not required, ensuring the safety of workers.

[0024] Meanwhile, a central pipe support is also set. When using this slag discharging mechanism, it is not necessary to extract the central pipe, avoiding the problem that the central pipe is difficult to extract. At the same time, since the step of extracting the central pipe is cancelled, the operation process of workers is reduced, making the discharging efficiency of the reduction furnace higher and the continuity better.

[0025] An operation method of the bottom slag discharging mechanism of a vertical magnesium reduction furnace. The low-temperature area of the reduction furnace is covered with reduced slag. Combining with the vertical discharging of the discharging mechanism, the problem of material blockage caused by the crystallization and agglomeration of magnesium at the bottom of the reduction tank and the situation of raw material waste are solved. Description of the Drawings

[0026] Figure 1 Schematic structural diagram when the bottom cover of the reduction tank of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention is opened; Figure 2 Schematic structural diagram when the bottom cover of the reduction tank of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention is closed; Figure 3 Side view when the bottom cover of the reduction tank of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention is opened; Figure 4 Side view when the bottom cover of the reduction tank of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention is closed; Figure 5 Top view when the bottom cover of the reduction tank of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention is opened; Figure 6 Top view when the bottom cover of the reduction tank of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention is closed; Figure 7 Schematic internal structural diagram when the bottom cover of the reduction tank of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention is opened; Figure 8 Schematic internal structural diagram when the bottom cover of the reduction tank of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention is closed; Figure 9 Schematic structural diagram of the central pipe support of the central pipe of the bottom slag discharging mechanism of a vertical magnesium reduction furnace of the present invention.

[0027] In the figure: 1. Reduction tank body; 2. Reduction tank bottom cover; 3. Central pipe; 4. Central pipe support; 41. Limiting part; 5. First fixing ear; 6. Second fixing ear; 7. Bottom cover carrier; 8. First rotating shaft; 9. Second rotating shaft; 10. Sealing ring; 11. Raw material; 12. Reduction slag in low-temperature area; 13. Actuator. Detailed implementation mode

[0028] For better explaining the present invention for easy understanding, the present invention will be described in detail below in conjunction with the drawings through specific implementation modes. Among them, the orientation nouns such as "upper" and "lower" mentioned in this article are based on Figure 1 the orientation of

[0029] For a better understanding of the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to convey the scope of the present invention completely to those skilled in the art.

[0030] As Figures 1-9 shown, a bottom slag discharging mechanism of a vertical magnesium reduction furnace includes a reduction tank body 1, a reduction tank bottom cover 2, a flip mechanism and a central pipe support 4. The reduction tank body 1 is a cylindrical tank body. The reduction tank bottom cover 2 matches the bottom surface of the reduction tank body 1. The flip mechanism is connected to the reduction tank body 1 and the reduction tank bottom cover 2. The flip mechanism is used to control the opening and closing of the reduction tank bottom cover 2. The central pipe support 4 is arranged inside the reduction tank body 1. The central pipe support 4 is used to carry the central pipe 3.

[0031] By setting the reduction tank bottom cover 2 and the flip mechanism, vertical discharging is realized, and no horizontal force will be generated between the reduction slags, solving the problem of blockage of the discharging port caused by the mutual extrusion and balance of the agglomerated reduction slags during discharging. Therefore, there is no need for manual material penetration, ensuring the safety of workers.

[0032] At the same time, a central pipe support 4 is also set. When using this slag discharging mechanism, there is no need to extract the central pipe 3, avoiding the problem that the central pipe 3 is difficult to extract. At the same time, since the step of extracting the central pipe 3 is cancelled, the operation process of workers is reduced, making the discharging efficiency of the reduction furnace higher and the continuity better.

[0033] Specifically, the flip cover mechanism includes a first ear part, a second ear part, a bottom cover carrier 7 and an actuator 13. The first ear part is arranged in the middle of the outer wall of the reduction tank body 1, and the second ear part is arranged at the lower part of the outer wall of the reduction tank body 1. The bottom cover carrier 7 is fixedly connected to the reduction tank bottom cover 2, and the bottom cover carrier 7 is rotationally connected to the second ear part and the actuator 13. The actuator 13 is rotationally connected to the first ear part. The actuator 13 has a telescopic stroke. When it extends, the reduction tank bottom cover 2 moves away from directly below the reduction tank body 1, and when it contracts, the reduction tank bottom cover 2 tightly fastens the reduction tank body 1.

[0034] Specifically, the first ear part includes a pair of first fixed ears 5 arranged in parallel. A horizontal first rotating shaft 8 is arranged between the pair of first fixed ears 5. The second ear part includes a pair of second fixed ears 6 arranged in parallel. A horizontal second rotating shaft 9 is arranged between the pair of second fixed ears 6. The first ear part and the second ear part are respectively arranged on both sides of the reduction tank body 1. One end of the actuator 13 is rotationally connected to the first rotating shaft 8, and the other end is rotationally connected to the bottom cover carrier 7. The bottom cover carrier 7 is rotationally connected to the second rotating shaft 9.

[0035] Specifically, the bottom cover carrier 7 is U-shaped. The two ends of the top of the bottom cover carrier 7 are respectively connected to the first rotating shaft 8 at a pair of first fixed ears 5. The inner side of the bottom of the bottom cover carrier 7 is fixedly connected to the reduction tank bottom cover 2. There are a pair of actuators 13. One ends of the pair of actuators 13 are respectively rotationally connected to the first rotating shaft 8 at a pair of first fixed ears 5, and the other ends of the pair of actuators 13 are respectively rotationally connected to both sides of the bottom cover carrier 7.

[0036] By setting the specific structure of the flip cover mechanism, more efficient operation of the flip cover is achieved. The actuator 13 uses a telescopic rod.

[0037] Specifically, the central pipe support 4 is cross-shaped. The four endpoints of the cross are connected to the inner wall of the reduction tank body 1. A limiting part 41 is provided at the cross center. The outer peripheral surface of the limiting part 41 is a trumpet shape with the small end upward. The diameter of the small end of the limiting part 41 is smaller than the diameter of the central pipe 3, and the diameter of the large end of the limiting part 41 is greater than or equal to the diameter of the central pipe 3.

[0038] By setting the specific structure of the central pipe support 4, the central pipe support 4 can minimize the actual area while maintaining its own stability and the stability of the central pipe 3. The gap of the cross-shaped central pipe support 4 is larger than the cross-sectional area of the reduced slag agglomeration, so as to facilitate the smooth discharge of the reduced slag 12 through the central pipe support 4.

[0039] Specifically, the cross-section of the limiting part 41 is cross-shaped.

[0040] By setting the cross-section of the limiting part 41 to be cross-shaped, stable support for the central pipe 3 is achieved.

[0041] Specifically, the reduction tank bottom cover 2 is provided with a sealing ring 10 .

[0042] The sealing performance of the reduction tank bottom cover 2 is enhanced by providing the sealing ring 10 .

[0043] Specifically, the flap mechanism is connected to the reduction furnace control system.

[0044] By connecting the cover-turning mechanism to the reduction furnace control system, the opening and closing of the reduction tank bottom cover 2 can be remotely controlled, without the need to manually open the cover on site, thus avoiding potential safety hazards.

[0045] The reduction furnace control system is a prior art, and the specific method of connecting the flap mechanism to the reduction furnace control system can be implemented by those skilled in the art according to the requirements of this solution, which will not be described in detail here.

[0046] An operating method for a bottom slag discharge mechanism of a vertical magnesium reduction furnace comprises the following steps: S1, close the bottom cover 2 of the reduction tank, and place the central tube 3 on the central tube support 4; S2, adding reducing slag into the gap between the reducing tank body 1 and the central tube 3, and filling the reducing slag until it covers the low temperature zone of the reducing furnace; S3, adding raw material 11 above the reducing slag 12 and starting the reduction reaction; S4. After the reduction reaction is completed, the bottom cover 2 of the reduction tank is opened, and a transport device is used to receive the low-temperature reduction slag 12 that has not participated in the reaction in step S2 and the reduction slag formed after the reduction reaction of the raw material 11 in step S3.

[0047] In a conventional vertical magnesium reduction furnace, the part of the reduction tank exposed from the furnace body is a low-temperature zone. When the raw material 11 is filled for reduction reaction, magnesium is easy to crystallize and agglomerate at the bottom of the reduction tank, causing blockage. In addition, since the low-temperature zone will not be heated, the insufficient temperature makes it difficult for the raw material 11 to fully undergo a reduction reaction, resulting in waste. In step S03, the low-temperature zone of the reduction furnace is covered with reducing slag, which will not participate in the reduction reaction, thereby paving the bottom of the reduction tank body 1 with reducing slag. Combined with the vertical discharge of the discharge mechanism, the blockage problem caused by the crystallization and agglomeration of magnesium at the bottom of the reduction tank is solved, and the problem of waste of raw materials is solved.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A bottom slag discharging mechanism for a vertical magnesium reduction furnace, characterized in that, It includes a reduction tank body (1), a reduction tank bottom cover (2), a flap mechanism, and a central pipe support (4). The reduction tank body (1) is a cylindrical tank body. The reduction tank bottom cover (2) matches the bottom surface of the reduction tank body (1). The flap mechanism is connected to the reduction tank body (1) and the reduction tank bottom cover (2). The flap mechanism is used to control the opening and closing of the reduction tank bottom cover (2). The central pipe support (4) is arranged inside the reduction tank body (1), and the central pipe support (4) is used to carry the central pipe (3).

2. The bottom slag discharging mechanism of a vertical magnesium reduction furnace according to claim 1, characterized in that: The flap mechanism includes a first ear part, a second ear part, a bottom cover carrier (7), and an actuator (13). The first ear part is arranged in the middle of the outer wall of the reduction tank body (1). The second ear part is arranged at the lower part of the outer wall of the reduction tank body (1). The bottom cover carrier (7) is fixedly connected to the reduction tank bottom cover (2). The bottom cover carrier (7) is rotationally connected to the second ear part and the actuator (13). The actuator (13) is rotationally connected to the first ear part. The actuator (13) has a telescopic stroke. When it extends, the reduction tank bottom cover (2) moves away from directly below the reduction tank body (1). When it contracts, the reduction tank bottom cover (2) tightly buckles the reduction tank body (1).

3. The bottom slag discharging mechanism of a vertical magnesium reduction furnace according to claim 2, characterized in that: The first ear part includes a pair of parallel first fixed ears (5). A horizontal first rotating shaft (8) is arranged between the pair of first fixed ears (5). The second ear part includes a pair of parallel second fixed ears (6). A horizontal second rotating shaft (9) is arranged between the pair of second fixed ears (6). The first ear part and the second ear part are respectively arranged on both sides of the reduction tank body (1). One end of the actuator (13) is rotationally connected to the first rotating shaft (8), and the other end is rotationally connected to the bottom cover carrier (7). The bottom cover carrier (7) is rotationally connected to the second rotating shaft (9).

4. The bottom slag discharging mechanism of a vertical magnesium reduction furnace according to claim 3, characterized in that: The bottom cover carrier (7) is U-shaped. The two ends of the top of the bottom cover carrier (7) are respectively connected to the first rotating shaft (8) at a pair of first fixed ears (5). The inner side of the bottom of the bottom cover carrier (7) is fixedly connected to the reduction tank bottom cover (2). There are a pair of actuators (13). One ends of the pair of actuators (13) are respectively rotationally connected to the first rotating shafts (8) at a pair of first fixed ears (5), and the other ends of the pair of actuators (13) are respectively rotationally connected to both sides of the bottom cover carrier (7).

5. The bottom slag discharging mechanism of a vertical magnesium reduction furnace according to claim 1, characterized in that: The central pipe support (4) is cross-shaped. The four endpoints of the cross are connected to the inner wall of the reduction tank body (1). A limiting part (41) is arranged at the cross center. The outer peripheral surface of the limiting part (41) is a trumpet shape with the small end upward. The diameter of the small end of the limiting part (41) is smaller than the diameter of the central pipe (3), and the diameter of the large end of the limiting part (41) is larger than or equal to the diameter of the central pipe (3).

6. The bottom slag discharging mechanism of a vertical magnesium reduction furnace according to claim 5, characterized in that: The cross section of the limiting part (41) is cross-shaped.

7. The bottom slag discharging mechanism of a vertical magnesium reduction furnace according to claim 1, characterized in that: The reduction tank bottom cover (2) is provided with a sealing ring (10).

8. The bottom slag discharging mechanism of a vertical magnesium reduction furnace according to claim 1, characterized in that: The flap mechanism is connected to the reduction furnace control system.

9. An operation method of a bottom slag discharging mechanism of a vertical magnesium reduction furnace, characterized in that, It includes the following steps: S1. Close the reduction tank bottom cover (2), and place the central pipe (3) on the central pipe support (4). S2. Add reduction slag to the gap between the reduction tank body (1) and the central pipe (3), and fill the reduction slag until it covers the low-temperature area of the reduction furnace. S3. Start the reduction reaction after adding the raw material (11) above the reduced slag (12); S4. After the reduction reaction ends, open the bottom cover (2) of the reduction tank, and use a transportation device to receive the reduced slag in the low-temperature zone that did not participate in the reaction in step S2 and the reduced slag formed after the reduction reaction of the raw material (11) in step S3.

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