Iron removal device and aluminum oxide production line

Abstract

The utility model discloses an iron removal device and an aluminum oxide production line. The technical problem that in the prior art, the iron removal rate is low is solved. The iron removal device comprises a first-stage iron removal assembly, a second-stage iron removal assembly and a third-stage iron removal assembly, each of the first-stage iron removal assembly and the second-stage iron removal assembly comprises a slurry container, a first power piece and a first iron remover which are communicated in sequence, and an outlet of the first iron remover is communicated with a feeding port of the slurry container; the slurry container, the first power part and the first iron remover are communicated through a pipeline to form a circulation loop for removing iron from the slurry, and an outlet of the first iron remover of the primary iron removal assembly is communicated with a feeding hole of the slurry container of the secondary iron removal assembly; the third-stage iron removal assembly comprises a second iron remover, a second power part and a finished product container which are communicated in sequence, and the second iron remover is communicated with a discharge hole of the slurry container of the second-stage iron removal assembly. The iron removal device provided by the utility model is high in iron removal rate, and the purity of an aluminum oxide product is high.

Description

Technical Field

[0001] The present application belongs to the technical field of alumina iron removal, and specifically relates to an iron removal device and an alumina production line. Background Art

[0002] Alumina ceramics are a high-strength, high-temperature, wear-resistant material that is widely used in the manufacture of mechanical parts, furnaces, electronic devices and other fields. Its main component is alumina (Al2O3), which has the characteristics of high hardness, high strength, high wear resistance, and high corrosion resistance. However, high-purity alumina ceramics often contain certain iron impurities, which can harm their performance. First, iron will affect the corrosion resistance of high-purity alumina ceramics, making them prone to corrosion in strong acid, strong alkali and other environments. Secondly, iron will affect the mechanical properties of high-purity alumina ceramics, such as increasing their elastic modulus and reducing fracture toughness. In addition, iron will react with alumina at high temperatures to produce sintered products, forming an iron oxide layer on the surface of alumina particles, affecting the performance of alumina ceramics.

[0003] In the related art, the iron removal device includes an electromagnetic iron remover group and a circulating material storage tank, which are connected to form a circulating loop to achieve iron removal, but the iron removal rate is not high. Summary of the invention

[0004] In order to solve the current technical problem of low iron removal rate, the present application provides an iron removal device.

[0005] In a first aspect of the present application, there is provided an iron removal device, comprising a primary iron removal assembly, a secondary iron removal assembly and a tertiary iron removal assembly connected in series in sequence, wherein: the primary iron removal assembly and the secondary iron removal assembly both comprise a slurry container, a first power member and a first iron remover connected in sequence, the outlet of the first iron remover being connected to the feed inlet of the slurry container, so that the slurry container, the first power member and the first iron remover are connected through a pipeline to form a circulation loop for slurry iron removal, and the outlet of the first iron remover of the primary iron removal assembly is connected to the feed inlet of the slurry container of the secondary iron removal assembly;

[0006] The three-stage iron removal assembly includes a second iron remover, a second power member and a finished product container which are connected in sequence, and the second iron remover is connected to the discharge port of the slurry container of the two-stage iron removal assembly.

[0007] In some embodiments, the secondary iron removal assembly further includes a sand mill located between the first iron remover and the slurry container.

[0008] In some embodiments, in the secondary iron removal assembly, there are multiple slurry containers, and the multiple slurry containers are connected in parallel to form multiple branch pipelines. The secondary iron removal assembly also includes a first stop valve and a second stop valve connected to the branch pipelines. The number of the first stop valves, the second stop valves and the branch pipelines are the same and correspond one to one. The first stop valve and the second stop valve are respectively located on the feed port side and the discharge port side of the corresponding slurry container; the outlet of the first iron remover is connected to the input ends of the multiple first stop valves, and the outlet of the first iron remover of the primary iron removal assembly is connected to the feed port of one of the slurry containers of the secondary iron removal assembly.

[0009] In some embodiments, the slurry container of the primary iron removal assembly is an alumina slurry storage tank of an alumina production line.

[0010] In some embodiments, the circulation loop further includes a third stop valve, and the third stop valve is located between the slurry container and the first iron remover.

[0011] In some embodiments, a fourth stop valve is further arranged between the outlet of the first iron remover of the primary iron removal assembly and the feed port of the slurry container of the secondary iron removal assembly, and the input end of the fourth stop valve is connected to the feed port of the slurry container of the primary iron removal assembly.

[0012] In some embodiments, the first iron remover and the second iron remover each include a box body and a magnetic bar located in the box body, the box body is provided with an inlet and the outlet, and the height of the inlet is lower than the outlet.

[0013] In some embodiments, the magnetic induction intensity of the magnetic bar of the first iron remover is lower than the magnetic induction intensity of the magnetic bar of the second iron remover.

[0014] In some embodiments, in the first-stage iron removal component, a stirring structure is provided in the slurry container so that the alumina powder forms an alumina slurry; the iron removal device also includes a water tank and a material tank for containing the alumina powder, and the water tank and the material tank are both connected to the slurry container of the first-stage iron removal component.

[0015] In a second aspect of the present application, an alumina production line is provided, comprising an iron removal device according to any embodiment of the first aspect.

[0016] The iron removal device provided according to the embodiment of the present application comprises a primary iron removal component, a secondary iron removal component and a tertiary iron removal component which are connected in series in sequence, wherein:

[0017] Both the primary iron removal component and the secondary iron removal component include a slurry container, a first power component and a first iron remover which are connected in sequence. The outlet of the first iron remover is connected to the feed port of the slurry container to form a circulation loop for removing iron from the slurry. The outlet of the first iron remover of the primary iron removal component is connected to the feed port of the slurry container of the secondary iron removal component. The tertiary iron removal component includes a second iron remover, a second power component and a finished product container which are connected in sequence. The second iron remover is connected to the discharge port of the slurry container of the secondary iron removal component.

[0018] Both the primary iron removal component and the secondary iron removal component can remove iron from the slurry in a cycle, and each stage of the iron removal structure can achieve cyclic iron removal. However, during the slurry circulation process, part of the slurry may remain in the slurry container and not circulate to the first iron remover for iron removal. This will cause a large amount of iron impurities to remain in the local area of ​​the slurry. Therefore, even if the circulation continues in the later stage, the iron content in the slurry cannot be further reduced, and energy waste will also be caused. The primary iron removal component, the secondary iron removal component, and the tertiary iron removal component are connected in series to form a three-stage iron removal structure. Through the three-stage iron removal, all the slurry after the previous stage of iron removal enters the next stage of iron removal, which can ensure that all the slurry can pass through the first and second stage first iron removers. Finally, all the slurry passes through the second iron remover of the three-stage iron removal component and is stored in the finished product container. It can be seen that all the slurries have passed through two first iron removers and one second iron remover, which does not cause energy waste and ensures the iron removal effect of the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of an iron removal device in one or more embodiments of the present application is shown.

[0020] Figure 2 Shows Figure 1 Schematic diagram of slurry flow in the iron removal device.

[0021] Figure 3 A schematic structural diagram of the first iron remover and the second iron remover is shown.

[0022] Description of reference numerals:

[0023] 10-a first-stage iron removal assembly, 11-a slurry container of the first-stage iron removal assembly, 12-a first power member of the first-stage iron removal assembly, 13-a first iron remover of the first-stage iron removal assembly, 14-a third stop valve of the first-stage iron removal assembly.

[0024] 20-secondary iron removal assembly, 21-slurry container of the secondary iron removal assembly, 22-first power member of the secondary iron removal assembly, 23-first iron remover of the secondary iron removal assembly, 24-third stop valve of the secondary iron removal assembly, 25-first stop valve, 26-sand mill, 27-second stop valve.

[0025] 30-three-stage iron removal assembly, 31-second iron remover, 32-second power member, 33-finished product container.

[0026] 40-connecting pipeline, 41-fourth stop valve.

[0027] 101-box, 102-magnetic bar, 103-inlet, 104-outlet. DETAILED DESCRIPTION

[0028] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] The first aspect of the present application provides an iron removal device that can remove iron impurities in aluminum oxide slurry, aluminum nitride slurry or slurry formed by other inorganic powders, and has a high iron removal rate.

[0030] See also Figure 1 The iron removal device provided in the present application includes a primary iron removal component 10, a secondary iron removal component 20 and a tertiary iron removal component 30, wherein: the primary iron removal component 10 and the secondary iron removal component 20 both include slurry containers 11, 21, first power parts 12, 22 and first iron removers 13, 23 that are connected in sequence, and the output ends of the first iron removers 13, 23 are connected to the feed ports of the slurry containers 11, 21, so that the slurry containers 11, 21 and the first iron removers 13, 23 are connected through pipelines to form a circulation loop for slurry iron removal, wherein the circulation loop in which the various structures of the primary iron removal component 10 are connected through pipelines is a primary circulation loop, and the circulation loop in which the various structures of the secondary iron removal component 10 are connected through pipelines is a secondary circulation loop. The outlet of the first iron remover 13 of the primary iron removal assembly 10 is connected to the feed port of the slurry container 21 of the secondary iron removal assembly 20, so that the slurry after iron removal by the previous iron removal assembly 10 is sent to the next iron removal assembly for iron removal, thereby realizing two-stage iron removal of the slurry. The tertiary iron removal assembly 30 includes a second iron remover 31, a second power member 32, and a finished product container 33 that are connected in sequence. The second iron remover 31 is connected to the outlet of the slurry container of the secondary iron removal assembly 20, so that the slurry after secondary iron removal is stored in the finished product container 33 after tertiary iron removal.

[0031] Since the circulation loop includes slurry containers 11, 21, first power members 12, 22 and first iron removers 13, 23, the slurry can be circulated in the circulation loop under the power drive of the first power members 12, 22, and the slurry is circulated and iron removed. However, during the circulation of the slurry, part of the slurry may remain in the slurry containers 11, 21 without circulated iron removal, which will cause a large amount of iron impurities in the local area of ​​the slurry. Therefore, even if the circulation continues in the later stage, the iron content in the slurry cannot be further reduced, and energy waste will be caused. Through three-stage iron removal, all slurries after the previous stage of iron removal enter the next stage of iron removal, which can ensure that all slurries can pass through the two first iron removers 13, and finally all slurries are moved from the last stage of the first iron remover 23 and passed through the second iron remover 31, and stored in the finished product container 33. It can be seen that all slurries have passed through two first iron removers 13, 23 and one second iron remover 31, which does not cause energy waste and ensures the iron removal effect of the slurry.

[0032] See also Figure 2 The secondary iron removal component 20 also includes a sand mill 26 located between the first iron remover 23 and the slurry container 21 to finely grind the slurry flowing through the secondary circulation loop to refine the size of the alumina. The sand mill 26 is an advanced and efficient grinding equipment with wide material adaptability. The grinding chamber of the sand mill 26 is very narrow, the clearance of the lever is very small, and the grinding energy is the most intensive. With the high-performance cooling system and automatic control system, the continuous processing and continuous discharging of alumina materials can be realized, which greatly improves the production efficiency. In some embodiments, the sand mill 26 is the production equipment of the alumina production line. Adding the secondary iron removal component 20 to the alumina production line realizes the iron removal function in the alumina production process.

[0033] In some embodiments, see Figure 2In the secondary iron removal component 20, a plurality of pulp containers 21 are provided, and the plurality of pulp containers 21 are connected in parallel to form a plurality of branch pipelines. The secondary iron removal component 20 also includes a first stop valve 25 and a second stop valve 27 connected to the branch pipelines. The number of the first stop valve 25, the second stop valve 27 and the branch pipelines is the same and corresponds one to one. The first stop valve 25 and the second stop valve 27 are respectively located at the feed port side and the discharge port side of the corresponding pulp container 21; the outlet of the first iron remover 23 is connected to the inlet of the plurality of first stop valves 25. At the inlet end, the outlet of the first iron remover 13 of the first-stage iron removal component 10 is connected to the feed port of one of the slurry containers 21 of the second-stage iron removal component 20. The slurry can be sent to one of the slurry containers 21 after the first-stage circulation iron removal. A first stop valve 25 and a second stop valve 27 are arranged on the branch pipeline, wherein the first stop valve 25 realizes the conduction or cutoff of the output end of the corresponding branch pipeline and the main pipeline of the secondary circulation pipeline, and the second stop valve 27 realizes the conduction or cutoff of the corresponding branch pipeline and the input end of the main pipeline. The following is an example in which two slurry containers 21 of the secondary iron removal component 20 are provided, namely the first slurry container and the second slurry container. During operation, when the slurry is located in the first slurry container, the second stop valve 27 of the branch pipeline is opened to connect the discharge port of the first slurry container with the main pipeline, and the first stop valve 25 is closed to cut off the feed port from the main pipeline, the feed port of the second slurry container is connected to the main pipeline, and the discharge port is cut off from the main pipeline. The slurry in the first slurry container is removed by the first iron remover 23 and then returned to the second slurry container until all the slurry in the first slurry container enters the second slurry container. Then the discharge port of the second slurry container is connected to the main pipeline, the feed port is cut off from the main pipeline, the feed port of the first slurry container is connected to the main pipeline, the discharge port is cut off from the main pipeline, and the slurry in the second slurry container is returned to the first slurry container after iron removal by the first iron remover 23, until all the slurry in the second slurry container enters the first slurry container. This reciprocating cycle is carried out to achieve secondary iron removal. The secondary iron removal component 20 can achieve that all slurries can be ironed by the first iron remover 23, thereby improving the iron removal effect.

[0034] In some embodiments, in the secondary iron removal assembly 20, there are two slurry containers 21, and the two slurry containers 21 are connected in parallel to form two branches. In other embodiments, there are three slurry containers 21, and the three slurry containers 21 are connected in parallel to form three branches. In the case where the secondary iron removal assembly 20 is provided with multiple slurry containers 21, the sand mill 26 is located in the main road of the secondary iron removal assembly 20 to finely grind the slurry flowing through.

[0035] In some embodiments, the slurry container of the primary iron removal assembly 10 is an alumina slurry storage tank of an alumina production line, so as to add an iron removal function to the alumina production line.

[0036] See also Figure 2 , the circulation loop also includes the third stop valve 14, 24, specifically, the primary circulation loop includes the third stop valve 14, the secondary circulation reflux includes the third stop valve 24, the third stop valve 14, 24 is located between the corresponding slurry containers 11, 21 and the first iron remover 13, 23, the third stop valve 14, 24 can realize the cut-off or conduction of the circulation loop. In the case where the secondary iron removal component 20 is provided with a plurality of slurry containers 21, the third stop valve 24 is located in the trunk pipeline of the secondary iron removal component 20.

[0037] Please continue reading Figure 2 A fourth stop valve 41 is also provided between the outlet of the first iron remover 13 of the primary iron removal component 10 and the feed port of the slurry container 21 of the secondary iron removal component 20. The input end of the fourth stop valve 41 is connected to the feed port of the slurry container 11 of the primary iron removal component 10. That is to say, the primary circulation loop is connected to the secondary circulation loop through the connecting pipe 40, and the fourth stop valve 41 is installed on the connecting pipe 40, so as to realize the conduction or cutoff function of the primary circulation loop and the secondary circulation loop. When the primary circulation loop is connected to the secondary circulation loop, the slurry in the primary circulation loop can run into the secondary circulation loop. When the primary circulation loop and the secondary circulation loop are cut off, the primary circulation loop can work alone to realize the circulation iron removal, and the secondary circulation loop can also work alone to realize the circulation iron removal. The two circulation loops work at the same time to improve the iron removal efficiency.

[0038] See also Figure 3 , the first iron remover 13, 23 and the second iron remover 31 all include a box body 101 and a magnetic bar 102 located in the box body 101, the box body 101 can be a box-type box body, or a cylindrical box body, the box body 101 is provided with an inlet 103 and an outlet 104, the height of the inlet 103 is lower than the outlet 104, that is, the first iron remover 13, 23 and the second iron remover 31 all adopt the bottom-in and top-out slurry operation mode to remove iron, all the slurries will be close to the magnetic bar 102, and the iron removal rate is high. Since the iron removal object of the first iron remover 13, 23 and the second iron remover 31 is alumina slurry, which contains a certain amount of water, there will be no blockage and accumulation of materials during the iron removal process. In other embodiments, the height of the inlet 103 of the first iron remover 13, 23 and the second iron remover 31 is higher than the outlet 104, and the iron removal of the slurry can also be achieved.

[0039] The first iron remover 13, 23 and the second iron remover 31 both include a magnetic rod rack, which is located in the box 101, and the magnetic rods 102 are fixed to the magnetic rod rack to avoid mutual attraction between the magnetic rods 102. The magnetic rods 102 can be selected as strong magnetic rods 102 with a length and diameter matching the box 101 and the magnetic rod rack. In some embodiments, the magnetic induction intensity of the magnetic rod 102 of the first iron remover 13, 23 is lower than the magnetic induction intensity of the magnetic rod 102 of the second iron remover 31. In specific implementation, the magnetic induction intensity of the magnetic rod 102 of the first iron removal component 10, the second iron removal component 20 and the third iron removal component 30 increase successively. For example, in the first iron removal component 10, the magnetic induction intensity of the magnetic rod 102 of the first iron removal component 13 is 10,000 Gauss, in the second iron removal component 20, the magnetic induction intensity of the magnetic rod 102 of the first iron removal component 23 is 12,000 Gauss, and in the third iron removal component 30, the magnetic induction intensity of the magnetic rod 102 of the second iron removal component 31 is 15,000 Gauss, so as to match the iron removal requirements of different stages of the slurry and improve the iron removal effect.

[0040] In some embodiments, in the primary iron removal assembly 10, a stirring structure, such as a stirrer, is provided in the slurry container 11, which can be driven by a motor to rotate so that the alumina powder and water are fully mixed to form a uniform alumina slurry, which is convenient for subsequent iron removal. In other embodiments, the alumina slurry can be first formed in other tank mechanisms and then pumped into the slurry container 11, which can also facilitate subsequent iron removal.

[0041] In some embodiments, the iron removal device also includes a water tank and a material tank for containing alumina powder, and the water tank and the material tank are both connected to the slurry container 11 of the primary iron removal component 10, so that water and alumina powder can be added into the slurry container 11 respectively, and then stirred by a stirring structure to form alumina slurry.

[0042] In the present application, the first power member 12, 22 and the second power member 32 can be vacuum pumps, and of course other pumps can also be used, which is not limited in the present application. Each structure is connected by a pipeline, and the diameter and length of the pipeline can be determined according to the state of the material on site. The slurry containers 11, 21 can be structures such as slurry tanks and slurry tanks.

[0043] In a second aspect, the present application further provides an alumina production line, comprising an iron removal device according to any embodiment of the first aspect. The multi-stage circulation iron removal device is an important process in an alumina production line and plays a vital role in ensuring the quality and service life of alumina powder products.

[0044] The working process of each part of the iron removal device provided in this application is as follows:

[0045] (1) Primary iron removal component 10: The primary iron removal component 10 is used for primary cycle iron removal, and the cycle time is 1h to 4h. Every one hour or so, the magnetic rod 102 is taken out from the box 101 to clean the tiny iron particles adsorbed on the surface. After the cleaning is completed, the magnetic rod 102 is put back into the box 101.

[0046] (2) Secondary iron removal component 20: After the primary cycle iron removal in (1), the slurry is pumped into the first slurry container. The slurry passes through the first iron remover 23 of the secondary cycle from the first slurry container and is sand-ground before being pumped into the second slurry container. This is recorded as primary iron removal. The slurry in the second slurry container is then sand-ground through the first iron remover 23 and pumped into the first slurry container. This is recorded as secondary iron removal. The number of iron removals is related to the degree of sanding. For example, the longer the sanding time, the more times the tank is inverted, the more times the iron removal is performed. After each sanding, the magnetic rod 102 in the box 101 needs to be cleaned to prevent the magnetic rod 102 from adsorbing too many iron particles, which weakens the magnetism and causes the iron particles to return to the slurry.

[0047] (3) Tertiary iron removal assembly 30: The slurry that has been sand-grinded by the secondary iron removal assembly 20 is pumped into the finished product container 33 through the second power member 32 through the second iron remover 31. The pumping speed of the second power member 32 should not be too fast, otherwise the iron removal effect will be poor. The cleaning cycle of the magnetic rod 102 of the second iron remover 31 is generally once for 3 to 5 slurry containers.

[0048] The present application can simply and efficiently remove free iron ions in the slurry through primary slurry discharge cycle iron removal, secondary sand grinding process cycle iron removal, and tertiary iron removal before finished product discharge, thereby improving product purity. After the tertiary iron removal, the Fe content in the slurry is reduced from the original 10PPm to 2ppm, thereby preparing 4N and 5N grade high-purity alumina products with low iron content, ensuring the purity and qualified rate of ceramic products as well as the stability and service life of ceramic products.

[0049] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An iron removal device, characterized in that: It includes a primary iron removal component, a secondary iron removal component and a tertiary iron removal component connected in series, wherein: The primary iron removal assembly and the secondary iron removal assembly both include a slurry container, a first power member, and a first iron remover that are sequentially connected, the outlet of the first iron remover is connected to the feed port of the slurry container, so that the slurry container, the first power member, and the first iron remover are connected through a pipeline to form a circulation loop for slurry iron removal, and the outlet of the first iron remover of the primary iron removal assembly is connected to the feed port of the slurry container of the secondary iron removal assembly; The three-stage iron removal assembly includes a second iron remover, a second power member and a finished product container which are connected in sequence, and the second iron remover is connected to the discharge port of the slurry container of the two-stage iron removal assembly.

2. The iron removal device according to claim 1, characterized in that: The secondary iron removal assembly also includes a sand mill located between the first iron remover and the slurry container.

3. The iron removal device according to claim 2, characterized in that: In the secondary iron removal component, there are multiple slurry containers, and the multiple slurry containers are connected in parallel to form multiple branch pipelines. The secondary iron removal component also includes a first stop valve and a second stop valve connected to the branch pipeline. The number of the first stop valve, the second stop valve and the branch pipeline are the same and correspond one to one. The first stop valve and the second stop valve are respectively located on the feed port side and the discharge port side of the corresponding slurry container; the outlet of the first iron remover is connected to the input end of the multiple first stop valves, and the outlet of the first iron remover of the primary iron removal component is connected to the feed port of one of the slurry containers of the secondary iron removal component.

4. The iron removal device according to claim 2, characterized in that: The slurry container of the primary iron removal component is an alumina slurry storage tank of an alumina production line.

5. The iron removal device according to any one of claims 1 to 4, characterized in that: The circulation loop further includes a third stop valve, and the third stop valve is located between the slurry container and the first iron remover.

6. The iron removal device according to any one of claims 1 to 4, characterized in that: A fourth stop valve is also provided between the outlet of the first iron remover of the first-stage iron removal assembly and the feed port of the slurry container of the second-stage iron removal assembly, and the input end of the fourth stop valve is connected to the feed port of the slurry container of the first-stage iron removal assembly.

7. The iron removal device according to any one of claims 1 to 4, characterized in that: The first iron remover and the second iron remover both include a box body and a magnetic bar located in the box body. The box body is provided with an inlet and the outlet. The height of the inlet is lower than that of the outlet.

8. The iron removal device according to claim 7, characterized in that: The magnetic induction intensity of the magnetic bar of the first iron remover is lower than the magnetic induction intensity of the magnetic bar of the second iron remover.

9. The iron removal device according to any one of claims 1 to 4, characterized in that: In the first-stage iron removal component, a stirring structure is provided in the slurry container to form the alumina powder into alumina slurry; the iron removal device also includes a water tank and a material tank for containing alumina powder, and the water tank and the material tank are both connected to the slurry container of the first-stage iron removal component.

10. An alumina production line, characterized in that: The invention comprises the iron removal device according to any one of claims 1 to 9.

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