A multi-stage discharging continuous metal magnesium reduction furnace and production method

Abstract

The present application relates to the technical field of metal magnesium production, and particularly relates to a multi-stage discharging continuous metal magnesium reduction furnace and a production method, which comprises a reduction tank, grading mechanisms and a discharger, the reduction tank is an equal-diameter circular tube arranged through the furnace body in the vertical direction, the discharger is arranged below the reduction tank, and a plurality of grading mechanisms are arranged in the vertical direction and stacked in the reduction tank, the bottom grading mechanism is located in the discharger, and the grading mechanism comprises a reactor used for collecting magnesium vapor in the reduction tank. The discharger drives the grading mechanism and the material to descend out of the furnace, the top of the reduction tank is supplemented with the grading mechanism and the material to be reacted, the continuous production of the magnesium reduction furnace is realized, the single-furnace production capacity is improved, and the problems of large furnace temperature disturbance and low service life of the reduction tank are solved.

Description

Technical Field

[0001] This invention relates to the field of magnesium metal production technology, and in particular to a multi-stage discharge continuous magnesium metal reduction furnace and production method. Background Technology

[0002] Industrially, magnesium smelting technology mainly refers to the thermal reduction method, represented by the Pidgeon process. The traditional Pidgeon process uses horizontal reamer reduction furnaces, but horizontal reamer production suffers from extremely poor automation and continuity, resulting in low capacity. Furthermore, due to the large span of the horizontal reamers, they are prone to sinking, bending, and deformation under high temperatures, shortening their service life. Therefore, in recent years, vertical reduction furnaces have begun to be used in production to address the problems associated with horizontal reamers. Structurally, the vertical reduction furnace places the reamer vertically inside the furnace chamber, resulting in a high degree of automation in material feeding and discharging. It has now replaced the horizontal reamer reduction furnace and become the mainstream technology.

[0003] Chinese Invention Patent Publication No. CN118361950B Figures 1-3 The structure of the current vertical reduction furnace is disclosed in section 0003 of the instruction manual. In the vertical reduction furnace, the reduction tank is placed vertically inside the furnace body, and a central tube is set inside the reduction tank. During production, the material is first added to the area between the tank and the central tube using an overhead crane. Then, the crystallizer and the furnace cover are installed in sequence, so that the pellet material is reduced at a temperature of 1200°C. After the reaction is completed, the furnace cover is opened. First, the crystallizer is removed using an overhead crane, and then the central tube is lifted out using an overhead crane. At the same time, a material collection trolley is used at the bottom of the furnace to collect the slag flowing out from the bottom of the reduction tank. After the slag is removed, the central tube and material are put back in for recycling.

[0004] Clearly, the charging and discharging processes of vertical reduction furnaces represent a significant improvement over those of horizontal reduction furnaces. However, vertical reduction furnaces still operate intermittently, processing in batches, and have not achieved fully continuous production. The production interruption time during the charging and discharging phases remains relatively long, and there is still room for improvement in single-furnace capacity. Furthermore, in this intermittent operation, the instantaneous addition of cold material to the vertical tank during the charging phase after discharging severely disrupts the furnace temperature field, leading to fluctuations in production conditions. Stable production conditions are a prerequisite for the normal operation of thermal furnaces. Additionally, the high-temperature reduction tank has relatively low strength; the instantaneous contact with a large amount of cold material, coupled with significant temperature differences and lateral pressure, can easily cause the tank to crack and deform, severely impacting its service life. Summary of the Invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a multi-stage discharge continuous magnesium reduction furnace and production method. By designing a discharge device to drive the grading mechanism and the material to descend and exit the furnace, and replenishing the grading mechanism and the material to be reacted at the top of the reduction tank, continuous production of magnesium reduction furnace is realized, the single furnace capacity is improved, and the problems of large furnace temperature disturbance and short reduction tank life are solved.

[0006] A multi-stage discharge continuous magnesium reduction furnace includes a reduction tank, a grading mechanism, and a discharge device. The reduction tank is a circular tube of equal diameter that runs vertically through the furnace body. The discharge device is located below the reduction tank. Multiple grading mechanisms are stacked vertically inside the reduction tank, with the bottom grading mechanism located inside the discharge device. Each grading mechanism includes a reactor for collecting magnesium vapor inside the reduction tank.

[0007] By setting multiple grading mechanisms in the reduction tank and installing a discharge device at the bottom of the reduction tank, the discharge device can drive the grading mechanisms and materials to descend and exit the furnace. The top of the reduction tank can replenish the grading mechanisms and materials to be reacted, thus realizing continuous production of the magnesium reduction furnace, increasing the single furnace capacity, and solving the problems of large furnace temperature fluctuations and short reduction tank life caused by loading a large amount of cold material at one time in traditional intermittent operation.

[0008] Furthermore, the grading mechanism also includes a base, the diameter of which matches the inner wall diameter of the reduction tank; the reactor sidewall is provided with vent holes, the reactors of adjacent grading mechanisms are connected, and the reactor of the top grading mechanism is connected to the magnesium vapor collection mechanism.

[0009] By setting a base that matches the diameter of the reduction tank, the discharger can quantitatively discharge materials from each grading mechanism, preventing unreacted materials from flowing out. The specific structure of the reactor enables the collection of magnesium vapor within the reduction tank.

[0010] Furthermore, the reactor is located at the center of the base, and all the reactors of the grading mechanism are arranged in a vertical row in the reduction tank.

[0011] By placing the reactor in the center, the efficiency of magnesium vapor collection was improved.

[0012] Furthermore, it also includes a support mechanism located at the bottom of the reduction tank, which is used to support the grading mechanism inside the reduction tank when the discharger is disengaged.

[0013] By setting up a support mechanism, it is easy for the discharge device to detach from the reduction tank, and the discharge device can be replaced with one that has been emptied of material to continue production.

[0014] A method for producing magnesium metal in a multi-stage discharge continuous reduction furnace includes the following steps: S1. Place the bottom of the discharge device against the bottom of the reduction tank, and load several classifying mechanisms and materials to be reacted into the reduction tank from the top. After the reduction tank is full, connect the reactor of the top classifying mechanism to the magnesium vapor collection mechanism. S2. The discharge device descends slowly, driving the grading mechanism to descend slowly inside the reduction tank, and the material continues to be heated and reacted inside the reduction tank. S3. When the top-level grading mechanism is fully inside the reduction tank, the magnesium vapor collection mechanism is separated, a new grading mechanism is added to the top of the reduction tank, and the magnesium vapor collection mechanism is connected. As the discharge device descends, the material is filled inside the reduction tank. S4. When the bottom grading mechanism is completely removed from the reduction tank, fix the upper grading mechanism. S5. Transport the discharge device containing the material out, and move the empty discharge device to a position where it is against the bottom of the reduction tank; S6, repeat steps S2-S5.

[0015] By designing a feeder to drive the grading mechanism and materials to descend and exit the furnace, and replenishing the grading mechanism and materials to be reacted at the top of the reduction tank, continuous production of magnesium reduction furnace is realized, the single furnace capacity is increased, and the problems of large furnace temperature disturbance and short reduction tank life caused by loading a large amount of cold material at one time in traditional intermittent operation are solved.

[0016] Furthermore, step S4 shuts down the magnesium vapor collection mechanism, and step S5 turns the magnesium vapor collection mechanism on after the operation is completed.

[0017] By designing the start and stop of the magnesium vapor collection mechanism, the large amount of air drawn from the bottom of the furnace and disturbing the furnace temperature is avoided when the feeder is replaced.

[0018] The beneficial effects of this invention are: This invention discloses a multi-stage discharge continuous magnesium reduction furnace and production method, which eliminates the central tube of the traditional reduction furnace. By designing a discharge device to drive the grading mechanism and the material to descend and exit the furnace, the grading mechanism and the material to be reacted are replenished at the top of the reduction tank, realizing continuous production of magnesium reduction furnace. The method is an iterative upgrade of the traditional intermittent method, which improves the single furnace capacity and solves the problems of large furnace temperature disturbance and short reduction tank life caused by charging a large amount of cold material at one time in the traditional intermittent operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a multi-stage discharge continuous magnesium metal reduction furnace according to the present invention. Figure 2 This is a schematic diagram of the reduction tank and discharge device of the present invention; Figure 3 This is a front view of the feeder of the present invention; Figure 4 This is a top view of the feeder of the present invention; Figure 5 This is a front view of the grading mechanism of the present invention; Figure 6 This is a side view of the grading mechanism of the present invention.

[0020] In the diagram: 1. Reduction tank; 2. Reactor; 3. Discharge device; 4. Magnesium vapor collection mechanism; 5. Material; 6. Support mechanism; 7. Base; 8. Vent. Detailed Implementation

[0021] To better explain and facilitate understanding of the present invention, it will be described in detail below with reference to the accompanying drawings and specific embodiments. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a clearer and more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0022] like Figures 1-6 As shown, a multi-stage discharge continuous magnesium reduction furnace includes a reduction tank 1, a grading mechanism, and a discharge device 3. The reduction tank 1 is a circular tube of equal diameter that runs vertically through the furnace body. The discharge device 3 is located below the reduction tank 1. Multiple grading mechanisms are stacked vertically inside the reduction tank 1, with the bottom grading mechanism located inside the discharge device 3. The grading mechanism includes a reactor 2, which is used to collect magnesium vapor inside the reduction tank 1.

[0023] By setting multiple grading mechanisms in the reduction tank 1 and setting a discharge device 3 below the reduction tank 1, the discharge device 3 can drive the grading mechanism and material 5 to descend and exit the furnace. The top of the reduction tank 1 can replenish the grading mechanism and the material 5 to be reacted, thus realizing continuous production of the magnesium reduction furnace, increasing the single furnace capacity, and solving the problem of large furnace temperature disturbance and short life of reduction tank 1 caused by loading a large amount of cold material 5 at one time in traditional intermittent operation.

[0024] Specifically, the grading mechanism also includes a base 7, the diameter of which matches the inner wall diameter of the reduction tank 1; the side wall of the reactor 2 is provided with air holes 8, the reactors 2 of adjacent grading mechanisms are connected, and the reactor 2 of the top grading mechanism is connected to the magnesium vapor collection mechanism 4.

[0025] By setting a base 7 that matches the diameter of the reduction tank 1, the discharger 3 can quantitatively discharge materials from each grading mechanism, preventing unreacted materials 5 from flowing out. The specific structure of the reactor 2 enables the collection of magnesium vapor within the reduction tank 1.

[0026] Specifically, the reactor 2 is located at the center of the base 7, and all the reactors 2 of the grading mechanism are arranged in a vertical row in the reduction tank 1.

[0027] By placing reactor 2 in the center, the efficiency of magnesium vapor collection is improved.

[0028] Specifically, it also includes a support mechanism 6, which is located at the bottom of the reduction tank 1 and is used to support the grading mechanism inside the reduction tank 1 when the discharge device 3 is disengaged.

[0029] By setting up a support mechanism 6, it is easy for the discharge device 3 to detach from the reduction tank 1 and replace the discharge device 3 after the material 5 has been emptied to continue production.

[0030] A method for producing magnesium metal in a multi-stage discharge continuous reduction furnace includes the following steps: S1. Place the bottom of the discharge device 3 against the bottom of the reduction tank 1, and load several classifying mechanisms and the material to be reacted 5 into the top of the reduction tank 1 in sequence. After the reduction tank 1 is filled, connect the reactor 2 of the top classifying mechanism to the magnesium vapor collection mechanism 4. S2, the discharge device 3 descends slowly, driving the classification mechanism to descend slowly inside the reduction tank 1, and the material 5 continues to be heated and reacted inside the reduction tank 1. S3. When the top-level grading mechanism is fully introduced into the reduction tank 1, the magnesium vapor collection mechanism 4 is separated, a new layer of grading mechanism is added to the top of the reduction tank 1, and the magnesium vapor collection mechanism 4 is connected. As the discharge device 3 descends, the material 5 is filled inside the reduction tank 1. S4. When the bottom grading mechanism is completely removed from the reduction tank 1, fix the upper grading mechanism. S5. Discharge device 3 containing material 5 is transported out, and discharge device 3 emptying material 5 is moved to a point where it is against the bottom of reduction tank 1. S6, repeat steps S2-S5.

[0031] Figure 1 The reduction tanks 1 from left to right in the middle show the furnace state during the above steps. The reduction tank 1 is designed with a feeder 3 to drive the grading mechanism and material 5 to descend and exit the furnace. The top of the reduction tank 1 is replenished with the grading mechanism and the material 5 to be reacted, which realizes continuous production of magnesium reduction furnace, improves single furnace capacity, and solves the problem of large furnace temperature disturbance and short life of reduction tank 1 caused by loading a large amount of cold material 5 at one time in traditional intermittent operation.

[0032] Specifically, step S4 shuts down the magnesium vapor collection mechanism 4, and step S5 turns the magnesium vapor collection mechanism 4 on after the operation is completed.

[0033] By designing the start and stop of the magnesium vapor collection mechanism 4, the large amount of air drawn from the bottom of the furnace and disturbing the furnace temperature is avoided when the feeder 3 is replaced.

[0034] The magnesium vapor collection mechanism 4 includes a condensation system and a vacuum system. Existing equipment can be used to meet the usage requirements, and the specific structure will not be described in detail here.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-stage discharge continuous magnesium reduction furnace, characterized in that, The system includes a reduction tank (1), a grading mechanism, and a discharge device (3). The reduction tank (1) is a circular tube of equal diameter that runs vertically through the furnace body. The discharge device (3) is located below the reduction tank (1). Multiple grading mechanisms are stacked vertically inside the reduction tank (1). The bottom grading mechanism is located inside the discharge device (3). The grading mechanism includes a reactor (2) and a base (7). The diameter of the base (7) matches the diameter of the inner wall of the reduction tank (1). The reactor (2) is used to collect magnesium vapor inside the reduction tank (1). The side wall of the reactor (2) is provided with vents (8). The reactors (2) of adjacent grading mechanisms are connected. The reactor (2) of the top grading mechanism is connected to the magnesium vapor collection mechanism (4).

2. The multi-stage discharge continuous magnesium reduction furnace as described in claim 1, characterized in that: The reactor (2) is located at the center of the base (7), and all the reactors (2) of the grading mechanism are arranged in a row in the vertical direction in the reduction tank (1).

3. The multi-stage discharge continuous magnesium reduction furnace as described in claim 1, characterized in that: It also includes a support mechanism (6), which is located at the bottom of the reduction tank (1) and is used to support the grading mechanism inside the reduction tank (1) when the discharger (3) is disengaged.

4. A method for producing magnesium metal reduction in a multi-stage discharge continuous furnace, comprising a multi-stage discharge continuous magnesium metal reduction furnace as described in any one of claims 1-3, characterized in that, Includes the following steps: S1. Place the bottom of the discharge device (3) against the bottom of the reduction tank (1), and load several classification mechanisms and materials to be reacted (5) into the top of the reduction tank (1) in sequence. After filling the reduction tank (1), connect the reactor (2) of the top classification mechanism to the magnesium vapor collection mechanism (4). S2, the discharge device (3) descends slowly, driving the grading mechanism to descend slowly inside the reduction tank (1), and the material (5) continues to be heated and reacted inside the reduction tank (1); S3. When the top-level grading mechanism is fully entered into the reduction tank (1), the magnesium vapor collection mechanism (4) is separated, a new layer of grading mechanism is added to the top of the reduction tank (1), and the magnesium vapor collection mechanism (4) is connected. As the discharge device (3) descends, the material (5) is filled inside the reduction tank (1). S4. When the bottom grading mechanism is completely removed from the reduction tank (1), fix the upper grading mechanism. S5. Transport the discharge device (3) containing the material (5) out, and move the discharge device (3) empty of the material (5) to the bottom of the reduction tank (1); S6, repeat steps S2-S5.

5. The method for producing magnesium metal in a continuous multi-stage discharge furnace as described in claim 4, characterized in that: Step S4 closes the magnesium vapor collection mechanism (4), and step S5 opens the magnesium vapor collection mechanism (4) after the operation is completed.

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