A device and method for removing iron from cast aluminum alloy

Abstract

The present invention provides an iron removal device for cast aluminum alloy, comprising: a heat preservation box body and a heat preservation cover plate which are cooperatively arranged, and a heating component is arranged on the heat preservation cover plate. The heat preservation box body includes: a heat preservation box body with a convex-shaped cross section in the horizontal direction. When the heat preservation cover plate is covered on the heat preservation box body, an open aluminum inlet is left on one side of the top surface of the heat preservation box body; an immersion thermocouple, which is fixed on the side surface of the heat preservation box body and placed inside it; a partition plate, which is arranged inside the heat preservation box body and in its upper part to separate the upper accommodation space of the heat preservation box body; a first aluminum outlet, which is arranged on the side surface of the heat preservation box body, and its height is higher than the lowest point of the partition plate and lower than the highest point of the partition plate; a second aluminum outlet, which is arranged at the bottom of the side surface of the heat preservation box body. Through the technical solution of the present invention, gradient heat preservation can be realized, the precipitation of iron phase can be accelerated, and high-efficiency iron removal can be achieved without adding any iron-reducing solvent, ensuring the purity of the aluminum liquid and enabling continuous production.

Description

Technical Field

[0001] The present invention relates to the technical field of cast aluminum alloys, and in particular to a device and method for removing iron from cast aluminum alloys. Background Art

[0002] The iron element has a great influence on the casting properties of aluminum alloys. When the iron content is lower than 0.7%ωt, the Fe phase in the aluminum alloy is in block form, which can improve the heat resistance and strength of the aluminum alloy and is a beneficial element. When the content is higher than this, the Fe phase is in a coarse needle shape, which is not conducive to shrinkage compensation. Moreover, these needle-like phases are located at the grain boundaries, which are easy to split the matrix and seriously reduce the strength of the aluminum alloy. Therefore, controlling the Fe content in the aluminum alloy has a great influence on the performance of the aluminum alloy. In the related art, iron removal is generally carried out by filtration, electromagnetic separation, gravity sedimentation, centrifugation, solvent method, etc. Filtration, electromagnetic separation and centrifugation have relatively high equipment requirements and high production costs; the solvent method needs to add other elements to neutralize iron, introduce new impurities, and the purity of the aluminum liquid is poor, which is easy to affect the performance of the aluminum alloy; the gravity sedimentation method has poor iron removal effect and low production efficiency.

[0003] Patent document CN103966472B discloses a method for removing iron from a regenerated aluminum alloy, by combining a scouring agent and borax, adding the scouring agent to the aluminum alloy, letting it stand and then air cooling, to obtain an aluminum alloy with reduced iron; Patent document CN104060118B discloses an aluminum alloy iron removal flux containing a boron compound, by combining a scouring agent and boric acid, adding the scouring agent to the aluminum alloy and letting it stand, to obtain an aluminum alloy with reduced iron; Patent document CN107619958B discloses a method for removing iron from a regenerated Al-Mg-Si aluminum alloy, by adding an aluminum strontium modifier and metallic manganese to reduce the iron content in the aluminum alloy; Although both have a certain effect of reducing iron, impurities are easily introduced into the aluminum alloy, making it difficult to ensure the purity of the aluminum liquid, and continuous production is not possible, making it difficult to carry out industrial applications. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, an object of the present invention is to provide a device and method for removing iron from cast aluminum alloys. A heating component is arranged on the insulation cover plate so that it has the functions of heating and insulation, while the insulation box only has the insulation function, which can achieve gradient insulation, thereby accelerating the precipitation of the iron phase. No iron-reducing solvent is needed to achieve efficient iron removal, which not only ensures the purity of the aluminum liquid, but also has a high iron removal effect. At the same time, an open aluminum inlet and two aluminum outlets are designed to realize continuous addition and outflow of aluminum liquid, which is conducive to continuous production.

[0006] To achieve the above object, the technical solution of the first aspect of the present invention provides a device for removing iron from cast aluminum alloy, including: a heat preservation box body and a heat preservation cover plate arranged in cooperation, a heating component is arranged on the heat preservation cover plate, and the heat preservation box body includes: a heat preservation box body with a convex cross-section in the horizontal direction. When the heat preservation cover plate covers the heat preservation box body, an open aluminum inlet is left on one side of the top surface of the heat preservation box body; an immersion thermocouple is fixed on the side surface of the heat preservation box body and placed inside it to measure the temperature of the molten aluminum in the upper part of the heat preservation box body; a partition is arranged inside the heat preservation box body and in its upper part to separate the upper accommodation space of the heat preservation box body; a first aluminum outlet is arranged on the side surface of the heat preservation box body, and its height is higher than the lowest point of the partition and lower than the highest point of the partition; a second aluminum outlet is arranged at the bottom of the side surface of the heat preservation box body.

[0007] Preferably, the inner bottom surface of the heat preservation box body is arranged in a high-low step, wherein the height of the inner bottom surface corresponding to the open aluminum inlet and its adjacent partial area is lower than the height of other areas, and the second aluminum outlet is arranged at the side position corresponding to the lower inner bottom surface.

[0008] Preferably, the height difference between the high part and the low part of the inner bottom surface of the heat preservation box body is 3mm - 10mm.

[0009] Preferably, the heating component includes a plurality of heating rods densely distributed inside the heat preservation cover plate.

[0010] Preferably, the immersion thermocouple is arranged in an accommodation space formed by the side surface where the open aluminum inlet is located and the partition, the first aluminum outlet is arranged in another accommodation space, the bottoms of the two accommodation spaces are communicated, and the bottom end of the immersion thermocouple is higher than the lowest point of the partition.

[0011] The technical solution of the second aspect of the present invention provides a method for removing iron from cast aluminum alloy, using the device for removing iron from cast aluminum alloy according to any one of the above technical solutions, including the following steps:

[0012] S1, cover the heat preservation cover plate on the heat preservation box body, and keep the open aluminum inlet;

[0013] S2, control the heating component of the heat preservation cover plate to heat, and heat the temperature inside the heat preservation box body to above 600°C;

[0014] S3, feed the high-iron-content cast aluminum alloy after heating and melting into the heat preservation box body through the open aluminum inlet;

[0015] S4. Control the heating component of the heat preservation cover plate to heat, measure the temperature using an immersion thermocouple, control the temperature of the molten aluminum in the upper part of the heat preservation box within 600°C - 650°C, after gradient heat preservation for 10 min - 20 min, first open the first aluminum outlet, and after the low-iron-content molten aluminum flows out from the first aluminum outlet, then open the second aluminum outlet to control the outflow of the high-iron-content molten aluminum.

[0016] Preferably, the cast aluminum alloy with a high iron content is a cast aluminum alloy with an iron content ≥ 1%.

[0017] Preferably, the cast aluminum alloy includes, but is not limited to, aluminum-silicon alloy, aluminum-copper alloy, aluminum-magnesium alloy, and aluminum-zinc alloy.

[0018] If the high-iron-content cast aluminum alloy is an aluminum-silicon alloy, then the heating temperature in step S3 is 650°C, the temperature of the molten aluminum in the upper part of the heat preservation box in step S4 is controlled at 615°C, and the gradient heat preservation duration is 12 min.

[0019] If the high-iron-content cast aluminum alloy is an aluminum-copper alloy, then the heating temperature in step S3 is 640°C, the temperature of the molten aluminum in the upper part of the heat preservation box in step S4 is controlled at 620°C, and the gradient heat preservation duration is 15 min.

[0020] If the high-iron-content cast aluminum alloy is an aluminum-magnesium alloy, then the heating temperature in step S3 is 660°C, the temperature of the molten aluminum in the upper part of the heat preservation box in step S4 is controlled at 630°C, and the gradient heat preservation duration is 10 min.

[0021] If the high-iron-content cast aluminum alloy is an aluminum-zinc alloy, then the heating temperature in step S3 is 630°C, the temperature of the molten aluminum in the upper part of the heat preservation box in step S4 is controlled at 610°C, and the gradient heat preservation duration is 15 min.

[0022] Preferably, the method for removing iron from the cast aluminum alloy further includes the following steps: After continuously heating the high-iron-content molten aluminum flowing out from the second aluminum outlet, feed it into the heat preservation box through the open aluminum inlet, and repeat the iron removal operation in step S4.

[0023] The cast aluminum alloy iron removal device and method proposed by the present invention have the following beneficial technical effects:

[0024] (1) An iron removal device and method for cast aluminum alloy proposed by the present invention set a heating component on the heat preservation cover plate, enabling it to have the functions of heating and heat preservation, while the heat preservation box only has the function of heat preservation. Thus, gradient heat preservation can be achieved. At the position with a lower temperature at the bottom of the heat preservation box, supersaturated iron phases first continuously crystallize and precipitate. After precipitation, the iron phases serve as nucleation cores and continuously absorb the surrounding iron phases to continue crystallization, thereby forming uphill diffusion, reducing the free energy of the system, and realizing the segregation and sedimentation of iron phases in the aluminum liquid. Through the continuous sedimentation of iron phases, the iron content in the upper layer of the aluminum liquid is continuously reduced, which can be reduced to 0.7% or less and discharged through the first aluminum outlet. The iron content at the bottom of the aluminum liquid continuously increases and is discharged through the second aluminum outlet, thereby achieving efficient iron removal.

[0025] (2) An iron removal device and method for cast aluminum alloy proposed by the present invention accelerate the sedimentation and precipitation of iron phases through gradient heat preservation, etc. Without adding any iron-reducing solvents, it can achieve efficient iron removal, not only ensuring the purity of the aluminum liquid but also having a high iron removal effect.

[0026] (3) An iron removal device and method for cast aluminum alloy proposed by the present invention can achieve continuous addition and outflow of aluminum liquid by designing an open aluminum inlet and two aluminum outlets, which is conducive to realizing continuous production, solving the problem of low production efficiency of the ordinary gravity sedimentation method, and can be promoted to industrial applications.

[0027] (4) An iron removal device and method for cast aluminum alloy proposed by the present invention set a heating component on the heat preservation cover plate, which can achieve the gradient heat preservation function from top to bottom through thermal radiation. At the same time, through the cooperation of an immersion thermocouple, precise temperature control can be carried out, and efficient iron reduction of different types of cast aluminum alloys can be achieved, greatly improving the production efficiency.

[0028] (5) An iron removal device and method for cast aluminum alloy proposed by the present invention designs the inner bottom surface of the heat preservation box body as high and low steps, so that the second aluminum outlet corresponds to the lower inner bottom surface, further enabling the iron phases to segregate and sediment near the second aluminum outlet, further reducing the iron content in the upper layer of the aluminum liquid, while increasing the iron content at the second aluminum outlet, realizing the iron removal function, and enabling the iron phases to flow out from the second aluminum outlet.

[0029] The additional aspects and advantages of the present invention will be given in the following description part, some of which will become obvious from the following description or be understood through the practice of the present invention. Brief Description of the Drawings

[0030] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0031] Figure 1Shows a schematic structural diagram of an iron removal device for cast aluminum alloy according to an embodiment of the present invention;

[0032] Figure 2 Shows Figure 1 A schematic structural diagram of a heat preservation box body in an iron removal device for cast aluminum alloy;

[0033] Figure 3 Shows Figure 1 A schematic structural diagram of a heat preservation box cover in an iron removal device for cast aluminum alloy,

[0034] Wherein, Figures 1 to 3 The corresponding relationship between the reference numerals and the components in the figure is as follows:

[0035] 102 heat preservation box body, 1022 heat preservation box body, 1024 open aluminum inlet, 1026 immersion thermocouple, 1028 partition board, 1030 first aluminum outlet, 1032 second aluminum outlet, 104 heat preservation cover plate, 1042 heating component, 1042-1 heating rod. Specific embodiments

[0036] The present invention discloses an iron removal device and method for cast aluminum alloy. Those skilled in the art can draw on the content of this article and appropriately improve the process parameters to achieve. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all regarded as included in the present invention. The method and application of the present invention have been described through preferred embodiments. Relevant personnel can obviously make changes or appropriate changes and combinations to the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0037] The following further elaborates the present invention in conjunction with embodiments:

[0038] Such as Figures 1 to 3As shown in the figure, the iron removal device for cast aluminum alloy according to an embodiment of the present invention includes a cooperatively arranged heat preservation box body 102 and a heat preservation cover plate 104. A heating component 1042 is arranged on the heat preservation cover plate 104 to realize the heating and heat preservation functions. The heat preservation box body 102 includes a heat preservation box body 1022 with a convex cross-section in the horizontal direction. When the heat preservation cover plate 104 is covered on the heat preservation box body 102, an open aluminum inlet 1024 is left on one side of the top surface of the heat preservation body, which is convenient for continuously pouring aluminum liquid, conducive to realizing continuous production and improving production efficiency. An immersion thermocouple 1026 is fixed on the side surface of the heat preservation box body 1022. The immersion thermocouple 1026 is placed inside the heat preservation box body 1022, and can measure the temperature of the aluminum liquid in the upper part of the heat preservation box body 1022, which is convenient for cooperating with the heating component 1042 for precise temperature control, so as to realize more efficient iron reduction. A partition plate 1028 is arranged above the inside of the heat preservation box body 1022 to separate the upper accommodation space, so that after the aluminum liquid undergoes sufficient gradient heat preservation and the iron phase settles, it then flows out. A first aluminum outlet 1030 is arranged on the side surface of the heat preservation box body 1022, and its height is higher than the lowest point of the partition plate 1028, which can realize the discharge of the aluminum liquid with low iron content after iron reduction. A second aluminum outlet 1032 is arranged at the bottom of the side surface of the heat preservation box body 1022, which can realize the discharge of the aluminum liquid with high iron content after iron reduction. The designs of the open aluminum inlet 1024 and the two aluminum outlets can realize the continuous addition and outflow of aluminum liquid, which is conducive to realizing continuous production, solves the problem of low production efficiency of the ordinary gravity sedimentation method, and can be popularized to industrial applications.

[0039] Further, as Figure 1 and Figure 2 shown in the figure, the inner bottom surface of the heat preservation box body 1022 is arranged in a high-low step. Among them, the height of the inner bottom surface corresponding to the open aluminum inlet 1024 and its adjacent partial area is lower than the height of other areas. The second aluminum outlet 1032 is arranged at the side position corresponding to the inner bottom surface with a lower height. Thereby, it further enables the iron phase to agglomerate and settle near the second aluminum outlet 1032, further reducing the iron content in the upper layer of the aluminum liquid, while increasing the iron content at the second aluminum outlet 1032, realizing the iron reduction function, and enabling the iron phase to flow out from the second aluminum outlet 1032.

[0040] Further, the height difference between the high and low parts of the inner bottom surface of the heat preservation box body 1022 is 3 mm - 10 mm. On the one hand, it is convenient for the iron phase to continuously settle near the second aluminum outlet 1032. On the other hand, it is convenient for the aluminum liquid with low iron content after the iron phase agglomerates and settles to flow out from the first aluminum outlet 1030, and the iron content in the upper layer of the aluminum liquid is continuously reduced, which can be reduced to 0.7% and below.

[0041] Further, as Figure 1 and Figure 3As shown, the heating component 1042 includes a plurality of heating rods 1042-1 arranged in a closely-packed distribution inside the heat-insulating cover plate 104. Thus, a gradient heat-insulating function from top to bottom can be achieved through thermal radiation, which is further conducive to the efficient iron reduction of different types of cast aluminum alloys and can greatly improve production efficiency.

[0042] Furthermore, as Figure 1 and Figure 2 shown, the immersion thermocouple 1026 is arranged in a receiving space formed by the side where the open aluminum inlet 1024 is located and the partition plate 1028, and the first aluminum outlet 1030 is arranged in another receiving space. The bottoms of the two receiving spaces are connected, and the bottom end of the immersion thermocouple 1026 is higher than the lowest point of the partition plate 1028. Thus, the temperature of the molten aluminum added from the open aluminum inlet 1024 can be accurately measured, and the temperature of the upper part of the molten aluminum is measured. The temperature of the lower part of the molten aluminum will be gradiently lower than this temperature. With such precise control, the efficient segregation and sedimentation of the iron phase in the molten aluminum of different types of cast aluminum alloys can be achieved.

[0043] The iron removal device for cast aluminum alloys can achieve gradient heat insulation. At the position with a lower temperature at the bottom of the heat-insulating box 102, the supersaturated iron phase first continuously crystallizes and precipitates. After precipitation, the precipitated iron phase serves as a nucleation core and continuously absorbs the surrounding iron phase to continue crystallizing, thus forming uphill diffusion, reducing the free energy of the system, and realizing the segregation and sedimentation of the iron phase in the molten aluminum. Through the continuous sedimentation of the iron phase, the iron content in the upper layer of the molten aluminum is continuously reduced and can be reduced to 0.7% or less, and is discharged through the first aluminum outlet 1030. The iron content at the bottom of the molten aluminum continuously increases and is discharged through the second aluminum outlet 1032, thus achieving efficient iron removal.

[0044] Example 1

[0045] A method for removing iron from cast aluminum alloys, using the above-mentioned iron removal device for cast aluminum alloys, and the cast aluminum alloy being an aluminum-silicon alloy, includes the following steps:

[0046] S102, covering the heat-insulating cover plate with the heating component on the heat-insulating box, and leaving the open aluminum inlet;

[0047] S104, controlling the heating component of the heat-insulating cover plate to heat, and heating the temperature inside the heat-insulating box to above 600°C;

[0048] S106, heating the aluminum-silicon alloy with an iron content of 3% to 650°C, and then feeding it into the heat-insulating box through the open aluminum inlet;

[0049] S108. Control the heating component of the heat preservation cover plate to heat, measure the temperature using an immersion thermocouple, control the temperature of the molten aluminum in the upper part of the heat preservation box to 615 °C. After gradient heat preservation for 12 minutes, first open the first aluminum outlet. After the low-iron-content molten aluminum flows out from the first aluminum outlet, then open the second aluminum outlet to control the flow of the high-iron-content molten aluminum. After detection, the iron content of the molten aluminum flowing out from the first aluminum outlet is 0.69%, and the iron removal rate is 77%.

[0050] S110. Repeat steps S106 and S108 to batchwise reduce the iron content of the aluminum-silicon alloy.

[0051] In addition, the high-iron-content molten aluminum flowing out from the second aluminum outlet can be continuously heated and then fed into the heat preservation box through the open aluminum inlet, and the iron removal operation in step S108 can be repeated to improve the utilization rate of the molten aluminum.

[0052] Example 2

[0053] A method for removing iron from cast aluminum alloy, using the above-mentioned device for removing iron from cast aluminum alloy. The cast aluminum alloy is an aluminum-copper alloy, and it includes the following steps:

[0054] S202. Cover the heat preservation cover plate with a heating component on the heat preservation box body, and keep the open aluminum inlet.

[0055] S204. Control the heating component of the heat preservation cover plate to heat, and heat the temperature in the heat preservation box body to above 600 °C.

[0056] S206. Heat the aluminum-copper alloy with an iron content of 2.5% to 640 °C, and then feed it into the heat preservation box body through the open aluminum inlet.

[0057] S208. Control the heating component of the heat preservation cover plate to heat, measure the temperature using an immersion thermocouple, control the temperature of the molten aluminum in the upper part of the heat preservation box to 620 °C. After gradient heat preservation for 15 minutes, first open the first aluminum outlet. After the low-iron-content molten aluminum flows out from the first aluminum outlet, then open the second aluminum outlet to control the flow of the high-iron-content molten aluminum. After detection, the iron content of the molten aluminum flowing out from the first aluminum outlet is 0.7%, and the iron removal rate is 72%.

[0058] S210. Repeat steps S206 and S208 to batchwise reduce the iron content of the aluminum-copper alloy.

[0059] In addition, the high-iron-content molten aluminum flowing out from the second aluminum outlet can be continuously heated and then fed into the heat preservation box through the open aluminum inlet, and the iron removal operation in step S208 can be repeated to improve the utilization rate of the molten aluminum.

[0060] Example 3

[0061] A method for removing iron from cast aluminum alloy, using the above-mentioned iron removal device for cast aluminum alloy, the cast aluminum alloy being an aluminum-magnesium alloy, includes the following steps:

[0062] S302, cover the heat-insulating cover plate with a heating component on the heat-insulating box body, leaving an open aluminum inlet;

[0063] S304, control the heating component of the heat-insulating cover plate to heat, and heat the temperature inside the heat-insulating box body to above 600°C;

[0064] S306, heat the aluminum-magnesium alloy with an iron content of 2% to 660°C, and then send it into the heat-insulating box body through the open aluminum inlet;

[0065] S308, control the heating component of the heat-insulating cover plate to heat, use an immersion thermocouple to measure the temperature, control the temperature of the upper aluminum liquid in the heat-insulating box body to 630°C, after gradient heat preservation for 10 minutes, first open the first aluminum outlet, and after the aluminum liquid with a low iron content flows out from the first aluminum outlet, then open the second aluminum outlet to control the flow of the aluminum liquid with a high iron content. After detection, the iron content of the aluminum liquid flowing out from the first aluminum outlet is 0.7%, and the iron removal rate is 65%;

[0066] S310, repeat steps S306 and S308 to batch reduce the iron content of the aluminum-magnesium alloy.

[0067] In addition, the aluminum liquid with a high iron content flowing out from the second aluminum outlet can be continuously heated and then sent into the heat-insulating box body through the open aluminum inlet, and the iron removal operation in step S308 can be repeated to improve the utilization rate of the aluminum liquid.

[0068] Example 4

[0069] A method for removing iron from cast aluminum alloy, using the above-mentioned iron removal device for cast aluminum alloy, the cast aluminum alloy being an aluminum-zinc alloy, includes the following steps:

[0070] S402, cover the heat-insulating cover plate with a heating component on the heat-insulating box body, leaving an open aluminum inlet;

[0071] S404, control the heating component of the heat-insulating cover plate to heat, and heat the temperature inside the heat-insulating box body to above 600°C;

[0072] S406, heat the aluminum-zinc alloy with an iron content of 1.2% to 630°C, and then send it into the heat-insulating box body through the open aluminum inlet;

[0073] S408. Control the heating component of the heat preservation cover plate to heat, measure the temperature using an immersion thermocouple, control the temperature of the molten aluminum in the upper part of the heat preservation box to 610 °C. After gradient heat preservation for 10 minutes, first open the first aluminum outlet. After the low-iron-content molten aluminum flows out from the first aluminum outlet, then open the second aluminum outlet to control the flow of the high-iron-content molten aluminum. After detection, the iron content of the molten aluminum flowing out from the first aluminum outlet is 0.54%, and the iron removal rate is 55%.

[0074] S410. Repeat steps S406 and S408 to carry out batch iron reduction of aluminum-magnesium alloy.

[0075] In addition, the high-iron-content molten aluminum flowing out from the second aluminum outlet can be continuously heated and then fed into the heat preservation box through the open aluminum inlet, and the iron removal operation in step S408 can be repeated to improve the utilization rate of the molten aluminum.

[0076] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A device for removing iron from cast aluminum alloy, characterized in that, Comprising: A heat preservation box body and a heat preservation cover plate which are cooperatively arranged, a heating component is arranged on the heat preservation cover plate, and the heat preservation box body includes: A heat preservation box body with a convex-shaped cross-section in the horizontal direction. When the heat preservation cover plate is covered on the heat preservation box body, an open aluminum inlet is left on one side of the top surface of the heat preservation box body; an immersion thermocouple is fixed on the side surface of the heat preservation box body and placed inside it to measure the temperature of the molten aluminum in the upper part of the heat preservation box body; a partition plate is arranged inside the heat preservation box body and in its upper part to separate the upper accommodation space of the heat preservation box body; a first aluminum outlet is arranged on the side surface of the heat preservation box body, and its height is higher than the lowest point of the partition plate and lower than the highest point of the partition plate; a second aluminum outlet is arranged at the bottom of the side surface of the heat preservation box body. The inner bottom surface of the heat preservation box body is arranged in a high-low step, wherein the height of the inner bottom surface corresponding to the open aluminum inlet and its adjacent partial area is lower than the height of other areas, and the second aluminum outlet is arranged at the side position corresponding to the lower inner bottom surface. The height difference between the high and low parts of the inner bottom surface of the heat preservation box body is 3 mm - 10 mm.

2. The iron removal device for cast aluminum alloy according to claim 1, wherein: The heating component includes a plurality of heating rods densely arranged inside the heat preservation cover plate.

3. The iron removal device for cast aluminum alloy according to claim 2, wherein: The immersion thermocouple is arranged in a accommodation space formed by the side surface where the open aluminum inlet is located and the partition plate, the first aluminum outlet is arranged in another accommodation space, the bottoms of the two accommodation spaces are communicated, and the bottom end of the immersion thermocouple is higher than the lowest point of the partition plate.

4. A method for removing iron from cast aluminum alloy, characterized in that, Using the iron removal device for cast aluminum alloy according to any one of claims 1 to 3, the following steps are included: S1, cover the heat preservation cover plate on the heat preservation box body, and leave the open aluminum inlet; S2, control the heating component of the heat preservation cover plate to heat, and heat the temperature inside the heat preservation box body to above 600 °C; S3, send the high-iron-content cast aluminum alloy after heating and melting into the heat preservation box body through the open aluminum inlet; S4, control the heating component of the heat preservation cover plate to heat, use the immersion thermocouple to measure the temperature, control the temperature of the molten aluminum in the upper part of the heat preservation box body to be 600 °C - 650 °C, after gradient heat preservation for 10 min - 20 min, first open the first aluminum outlet, and after the low-iron-content molten aluminum flows out from the first aluminum outlet, then open the second aluminum outlet to control the outflow of the high-iron-content molten aluminum.

5. The method for removing iron from cast aluminum alloy according to claim 4, characterized in that, The high-iron-content cast aluminum alloy is a cast aluminum alloy with an iron content ≥ 1%.

6. The iron removal method for cast aluminum alloy according to claim 5, wherein: The cast aluminum alloy includes but is not limited to aluminum-silicon alloy, aluminum-copper alloy, aluminum-magnesium alloy, aluminum-zinc alloy. If the high-iron-content cast aluminum alloy is aluminum-silicon alloy, then the heating temperature in step S3 is 650 °C, the temperature of the molten aluminum in the upper part of the heat preservation box body in step S4 is controlled to be 615 °C, and the gradient heat preservation duration is 12 min. If the high iron content cast aluminum alloy is an aluminum-copper alloy, the heating temperature in step S3 is 640 °C, the temperature of the upper aluminum liquid in the insulation box in step S4 is controlled at 620 °C, and the gradient insulation duration is 15 min; If the high iron content cast aluminum alloy is an aluminum-magnesium alloy, the heating temperature in step S3 is 660 °C, the temperature of the upper aluminum liquid in the insulation box in step S4 is controlled at 630 °C, and the gradient insulation duration is 10 min; If the high iron content cast aluminum alloy is an aluminum-zinc alloy, the heating temperature in step S3 is 630 °C, the temperature of the upper aluminum liquid in the insulation box in step S4 is controlled at 610 °C, and the gradient insulation duration is 15 min.

7. The method for removing iron from cast aluminum alloy according to claim 6, characterized in that, It further includes the following steps: After continuously heating the high iron content aluminum liquid flowing out from the second aluminum outlet, it is sent into the insulation box through the open aluminum inlet, and the iron removal operation in step S4 is repeated.

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