Production method of regenerated aluminum alloy foil for adhesive tape

Abstract

The invention relates to the technical field of aluminum foil production, in particular to a production method of regenerated aluminum alloy foil for an adhesive tape, which comprises the following steps of: 1, smelting and casting aluminum alloy waste into an aluminum alloy cast ingot; 2, the aluminum alloy cast ingot is subjected to surface milling treatment; 3, the aluminum alloy cast ingot is subjected to soaking treatment; 4, the aluminum alloy cast ingot is subjected to hot rolling treatment; 5, the aluminum alloy coiled material is subjected to cold rolling treatment; 6, intermediate annealing treatment is conducted on the aluminum alloy coiled material; 7, cold foil rolling treatment is conducted on the aluminum alloy coiled material; and 8, annealing treatment is conducted on the aluminum alloy foil finished product. The defects of the aluminum alloy foil for the adhesive tape caused by pinholes and holes can be effectively prevented; meanwhile, composition segregation of the aluminum alloy cast ingot is effectively eliminated, and the internal stress of the aluminum alloy cast ingot is reduced; and growth of crystal grains in a high-temperature state is effectively avoided, and the structure performance of the crystal grains is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum foil production, and in particular to a method for producing recycled aluminum alloy foil for adhesive tape. Background Art

[0002] Aluminum alloy foil is a special aluminum foil material that can be used to make tape or as part of the tape. Aluminum alloy foil has a series of excellent properties and characteristics, which can meet the use requirements of tape in different fields and scenarios. Aluminum alloy foil is made of aluminum alloy and has excellent metal ductility and plasticity, making aluminum alloy foil a rational material for making tape. Aluminum alloy foil has stable chemical properties, is not easy to oxidize and corrode, can resist various harsh environments, and prolong the service life of the tape. Aluminum alloy foil has good conductivity, flame retardancy, thermal insulation and shielding properties, making aluminum foil tape widely used in electrical insulation, cable shielding and pipeline insulation. When used in tape, aluminum alloy foil is mainly used as a reinforcing material, conductive layer or thermal insulation layer to improve the functionality and durability of the tape. Aluminum alloy foil as a reinforcing layer can increase the tensile strength and tear strength of the tape; aluminum alloy foil as a conductive layer can be used as a key component in occasions where conductivity or electromagnetic shielding is required; aluminum alloy foil as a thermal insulation layer uses its good thermal conductivity and is used as a thermal insulation material in some special tapes. In summary, aluminum alloy foil for adhesive tape is a multifunctional, high-performance aluminum foil material that plays an important role in adhesive tape manufacturing.

[0003] The existing technology usually uses aluminum alloy waste as raw material to regenerate aluminum alloy foil for tape, which not only realizes the production of aluminum alloy foil for tape, but also realizes the secondary utilization of resources, further reduces resource consumption and reduces environmental pollution; however, when the recycled aluminum alloy foil for tape is produced, due to the large diameter of impurities in the aluminum alloy, pinholes and holes are prone to appear on the surface of the aluminum alloy foil, and there are also problems such as segregation of aluminum alloy ingot composition, high internal stress and large grains. Summary of the invention

[0004] The present invention aims to solve the problems of aluminum alloy ingot component segregation, high internal stress, large grains and easy pinholes and holes in the aluminum alloy foil during the production of recycled aluminum alloy foil for adhesive tape in the prior art, and provides a production method for recycled aluminum alloy foil for adhesive tape. The method can effectively prevent the defects of aluminum alloy foil for adhesive tape caused by pinholes and holes; at the same time, effectively eliminate the component segregation of aluminum alloy ingot and reduce the internal stress of aluminum alloy ingot; and effectively avoid the growth of grains under high temperature state, thereby improving the grain structure performance.

[0005] In order to achieve the above object, the technical solution of the present invention is: a method for producing recycled aluminum alloy foil for adhesive tape, comprising the following steps: Step 1: Smelt the aluminum alloy waste and cast it into aluminum alloy ingots. Add aluminum ingots during the smelting of the aluminum alloy waste, control the aluminum alloy elements and the proportion of each element in the molten aluminum alloy solution, and perform online degassing and deslagging operations on the aluminum alloy solution.

[0006] Step 2: Mill the aluminum alloy ingot. The milling amount of the large surface of the aluminum alloy ingot is ≥20mm, the milling amount of the small surface is ≥10mm, and the thickness difference between the two sides of the aluminum alloy ingot is ≤3mm.

[0007] Step 3: Perform a homogenization treatment on the aluminum alloy ingot, place the milled aluminum alloy ingot in a heating furnace, the homogenization treatment temperature is 550-580°C, and the furnace outlet temperature is 500-520°C.

[0008] Step 4: hot rolling the aluminum alloy ingot, the aluminum alloy ingot is hot rough rolled through 17 to 21 passes into a billet with a thickness of 38 mm, and then the billet is hot finish rolled through 4 passes into an aluminum alloy coil with a thickness of 5 to 6 mm.

[0009] Step 5: The aluminum alloy coil is cold rolled and rolled into an aluminum alloy coil with a thickness of 0.6 mm through 4 passes.

[0010] Step 6: Perform intermediate annealing on the aluminum alloy coil. Place the aluminum alloy coil with a thickness of 0.6 mm in an annealing furnace protected by inert gas at an annealing temperature of 330 to 380°C.

[0011] Step 7: The aluminum alloy coil is subjected to cold foil rolling, and the aluminum alloy coil after intermediate annealing is rolled into a single-layer aluminum alloy foil product with a thickness of 0.04 to 0.1 mm through three passes.

[0012] Step 8: Annealing the finished aluminum alloy foil. Cut the aluminum alloy foil coil after cold foil rolling into small coils and then anneal them. After the aluminum alloy foil coil is annealed and air-cooled, the production of the aluminum alloy foil is completed.

[0013] Furthermore, in the step 1, the aluminum alloy waste is placed in a smelting furnace, and an aluminum ingot and a modifier Ti are added, and then smelted at 720-760° C. for 4-6 hours; wherein the proportion of each element in the aluminum alloy solution is Si=0.4-0.8%, Fe <0.4%, Cu=0.15-0.4%, Mn<0.15%, Mg 0.8-1.2%, Cr=0.04-0.35%, Zn<0.25%, Ti<0.15%, and the rest is Al, and heavy metals (Cd+Hg+Pb) ≤0.1%.

[0014] Furthermore, in the step 1, the smelted aluminum alloy solution is refined in a refining furnace at 720-760° C. for 10-20 min, and high-purity argon inert gas is used for degassing and deslagging; then the aluminum alloy solution is introduced into a static furnace and refined again at 720-760° C. for 30-50 min, and high-purity argon inert gas is used for degassing and deslagging. After the refining is completed, the slag is removed and the solution is allowed to stand at 720-760° C. for 20-40 min.

[0015] Furthermore, in the step 1, after the aluminum alloy solution in the static furnace has been static for a long time, an online degassing and slag removal operation is performed, the aluminum alloy solution is introduced into a primary filtering device for filtration, and then introduced into an online degassing device for online degassing, and a high-purity argon inert gas high-speed rotary blowing method is used for online degassing. The rotation speed of the online degassing graphite rotor is ≥300r / min, and the hydrogen content in the aluminum alloy solution after online degassing is ≤0.12ml / 100gAl; after the online degassing, the aluminum alloy solution is successively introduced into a secondary filtering device and a tertiary filtering device to control the diameter of impurities in the aluminum alloy solution to be within <0.005mm.

[0016] Furthermore, in the step 1, after the online degassing and slag removal operations are completed, the aluminum alloy solution is cast into an aluminum alloy ingot at 690-720° C., with a casting rate of 40-60 mm / min, wherein the total time for online degassing and casting is 1.5-2.0 hours.

[0017] Furthermore, in the step 3, the temperature in the furnace of the heating furnace is controlled at 590-630°C, and the aluminum alloy ingot is placed in the heating furnace and heated from room temperature to 550-580°C over 15-20 hours, kept warm for 4-8 hours, then cooled from 550-580°C to 520-540°C over 1-3 hours, and kept warm for 2-4 hours before being taken out of the furnace.

[0018] Furthermore, in the step 4, the hot rolling opening temperature of the aluminum alloy ingot is 520-540°C, and the aluminum alloy ingot is subjected to hot rough rolling by a 1+4 hot rolling mill. After the hot rough rolling, the temperature of the aluminum alloy ingot is 430-450°C, and the aluminum alloy ingot is immediately subjected to hot finish rolling after the hot rolling is completed, and the final rolling temperature is ≥300°C.

[0019] Furthermore, in the step 4, emulsion is used for cooling and lubrication during the hot rough rolling and hot finish rolling of the aluminum alloy ingot, the emulsion pressure during hot rough rolling is 0.3-0.35 MPa and the temperature is 55-65° C.; the emulsion pressure during hot finish rolling is 0.4-0.5 MPa and the temperature is 55-65° C., wherein the mass concentration of the emulsion is 5.0-6.0%.

[0020] Furthermore, in step 6, the inert gas is nitrogen, the furnace temperature of the annealing furnace is 380-450°C, and the aluminum alloy coil is kept warm for 3-8 hours after the temperature reaches 330-380°C. After the insulation is completed, the coil is taken out of the furnace and air-cooled to complete the intermediate annealing treatment.

[0021] Furthermore, in the step 8, the aluminum alloy foil coil with a thickness of 0.04 to 0.1 mm is cut into small coils and then placed in a nitrogen protection furnace for annealing. The gas temperature of the nitrogen protection furnace is raised from room temperature to 220° C. in 6 hours, and then the aluminum alloy foil coil is kept warm for 14 hours. The gas temperature of the nitrogen protection furnace is raised from 220° C. to 260 to 300° C. in 2 hours, and then the aluminum alloy foil coil is kept warm for 18 to 40 hours. After the insulation is completed, the aluminum alloy foil coil is taken out of the furnace and air-cooled to complete the production of the aluminum alloy foil.

[0022] Through the above technical solution, the beneficial effects of the present invention are: The present invention can effectively prevent defects of aluminum alloy foil for tape caused by pinholes and holes; at the same time, effectively eliminate the component segregation of aluminum alloy ingots, reduce the internal stress of aluminum alloy ingots; and effectively avoid the growth of grains under high temperature conditions, thereby improving the grain structure performance.

[0023] The present invention controls the composition of each element in the aluminum alloy more accurately by re-blending aluminum alloy waste and aluminum ingots, effectively avoiding the mechanical influence brought about by chemical composition fluctuations, solving the problem of excessive impurity element content in the recycled aluminum alloy, and improving the performance of the aluminum alloy foil.

[0024] The present invention adopts an efficient and convenient degassing and slag removal method when melting and casting aluminum alloy ingots, and simultaneously performs degassing and three-stage filtration, which effectively reduces the content of hydrogen and oxide slag in the aluminum alloy solution, and controls the diameter of impurities in the aluminum alloy solution to be within 0.05, effectively preventing defects of aluminum alloy foil for tape caused by pinholes and holes.

[0025] The present invention effectively eliminates the component segregation of the aluminum alloy ingot and reduces the internal stress of the aluminum alloy ingot by controlling the hot rolling and soaking treatment process, so as to make the chemical composition of the aluminum alloy ingot uniform, thereby improving the plasticity of the aluminum alloy foil; the rolling resistance of the aluminum alloy can be effectively eliminated by controlling the cold rolling process, and the aluminum alloy coil can be quickly annealed to effectively prevent the growth of grains under high temperature conditions, thereby improving the grain structure performance. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments: A method for producing recycled aluminum alloy foil for adhesive tape comprises the following steps: Step 1: Smelt the aluminum alloy waste and cast it into aluminum alloy ingots. Add aluminum ingots during the smelting of the aluminum alloy waste, control the aluminum alloy elements and the proportion of each element in the molten aluminum alloy solution, and perform online degassing and deslagging operations on the aluminum alloy solution.

[0027] In the step 1, the aluminum alloy waste is placed in a smelting furnace, and an aluminum ingot and a modifier Ti are added, and then smelted at 720-760° C. for 4-6 hours; wherein the proportion of each element in the aluminum alloy solution is Si=0.4-0.8%, Fe <0.4%, Cu=0.15-0.4%, Mn<0.15%, Mg 0.8-1.2%, Cr=0.04-0.35%, Zn<0.25%, Ti<0.15%, the rest is Al, and heavy metals (Cd+Hg+Pb) ≤0.1%.

[0028] In the step 1, the smelted aluminum alloy solution is refined in a refining furnace at 720-760° C. for 10-20 min, and high-purity argon inert gas is used for degassing and slag removal, and the degassing and slag removal effects are achieved by the high-purity argon inert gas; then the aluminum alloy solution is introduced into a static furnace, the components of each element in the aluminum alloy solution are detected, and aluminum ingots are added and refined again at 720-760° C. for 30-50 min, and high-purity argon inert gas is used for degassing and slag removal, and the degassing and slag removal effects are achieved by the high-purity argon inert gas. After the refining is completed, the scum is removed and the solution is allowed to stand at 720-760° C. for 20-40 min, which further melts the aluminum alloy solution and further removes impurities therein.

[0029] In the step 1, after the aluminum alloy solution in the static furnace has been statically placed, an online degassing and slag removal operation is performed, the aluminum alloy solution is introduced into a primary filtering device for filtration, and then introduced into an online degassing device for online degassing, and a high-purity argon inert gas high-speed rotary blowing method is used for online degassing. The rotation speed of the online degassing graphite rotor is ≥300r / min. The hydrogen content in the aluminum alloy solution after online degassing is ≤0.12ml / 100gAl, which is effective in preventing aluminum alloy foil defects caused by excessive hydrogen content; after online degassing, the aluminum alloy solution is successively introduced into a secondary filtering device and a tertiary filtering device, and the impurity diameter in the aluminum alloy solution is controlled within <0.005mm, which is effective in preventing aluminum alloy foil defects for adhesive tape caused by pinholes and holes, wherein the filter plate accuracy of the primary filtering device is 50Ppi, the filter plate accuracy of the secondary filtering device is 60PPi, and the tertiary filtering device is a 22 tube-type filtering device.

[0030] In the step 1, after the online degassing and slag removal operations are completed, the aluminum alloy solution is cast into an aluminum alloy ingot at 690-720° C., with a casting rate of 40-60 mm / min, wherein the total time for online degassing and casting is 1.5-2.0 hours.

[0031] Step 2: Mill the aluminum alloy ingot. The milling amount of the large surface of the aluminum alloy ingot is ≥20mm, the milling amount of the small surface is ≥10mm, and the thickness difference between the two sides of the aluminum alloy ingot is ≤3mm.

[0032] Step 3: Perform a homogenization treatment on the aluminum alloy ingot, place the milled aluminum alloy ingot in a heating furnace, the homogenization treatment temperature is 550-580°C, and the furnace outlet temperature is 500-520°C.

[0033] In the step 3, the temperature in the furnace of the heating furnace is controlled at 590-630°C. After the aluminum alloy ingot is placed in the heating furnace, the temperature is raised from room temperature to 550-580°C over 15-20 hours, and after being kept warm for 4-8 hours, the temperature is lowered from 550-580°C to 520-540°C over 1-3 hours, and kept warm for 2-4 hours before being taken out of the furnace. The use of this temperature for homogenization treatment can effectively eliminate the segregation of the components of the aluminum alloy ingot, reduce the internal stress of the aluminum alloy ingot, reduce the rolling energy consumption, and prevent the aluminum alloy ingot from cracking.

[0034] Step 4: The aluminum alloy ingot is hot rolled, and the aluminum alloy ingot is hot rough rolled through 17 to 21 passes of reversible rolling to form a billet with a thickness of 38 mm, wherein the thickness of the billet rolled in each pass is approximately 622-600-560-520-490-460-430-400-370-340-310-280-250-220-190-165-140-98-60-38 mm, and then the billet is hot finished rolled through 4 passes of irreversible rolling to form an aluminum alloy coil with a thickness of 5 to 6 mm, and the thickness of the billet rolled in each pass is approximately 38-22-12-7.5-5 mm.

[0035] In the step 4, the hot rolling opening temperature of the aluminum alloy ingot is 520-540°C, and the aluminum alloy ingot is subjected to hot rough rolling by a 1+4 hot rolling mill. After the hot rough rolling, the temperature of the aluminum alloy ingot is 430-450°C. After the hot rolling of the aluminum alloy ingot is completed, hot finish rolling is immediately performed, and the final rolling temperature is ≥300°C.

[0036] In the step 4, the aluminum alloy ingot is cooled and lubricated by emulsion during the hot rough rolling and hot finish rolling. The emulsion pressure during the hot rough rolling is 0.3-0.35 MPa and the temperature is 55-65° C.; the emulsion pressure during the hot finish rolling is 0.4-0.5 MPa and the temperature is 55-65° C., wherein the mass concentration of the emulsion is 5.0-6.0%.

[0037] Step 5: The aluminum alloy coil is cold rolled and rolled into an aluminum alloy coil with a thickness of 0.6 mm through 4 passes. The thickness of the billet rolled in each pass is approximately 5.0-2.8-1.7-1.0-0.6 mm.

[0038] Step 6: Perform intermediate annealing on the aluminum alloy coil. Place the aluminum alloy coil with a thickness of 0.6 mm in an annealing furnace protected by inert gas at an annealing temperature of 330 to 380°C.

[0039] In the step 6, the inert gas is nitrogen, the furnace temperature of the annealing furnace is 380-450°C, and the aluminum alloy coil is kept warm for 3-8 hours after the temperature reaches 330-380°C. After the insulation is completed, the aluminum alloy coil is taken out of the furnace and air-cooled to complete the intermediate annealing treatment; the aluminum alloy coil is cold-rolled to 0.6mm and intermediate annealing is performed to effectively eliminate the rolling resistance of the aluminum alloy coil, and rapid annealing effectively prevents grain growth under high temperature conditions, ensures smooth subsequent processing and improves grain structure performance.

[0040] Step 7: The aluminum alloy coil is subjected to cold foil rolling, and the aluminum alloy coil after intermediate annealing is rolled into a single-layer aluminum alloy foil product with a thickness of 0.04 to 0.1 mm through three passes.

[0041] Step 8: Annealing the finished aluminum alloy foil. Cut the aluminum alloy foil coil after cold foil rolling into small coils and then anneal them. After the aluminum alloy foil coil is annealed and air-cooled, the production of the aluminum alloy foil is completed.

[0042] In the step 8, the aluminum alloy foil coil with a thickness of 0.04 to 0.1 mm is cut into small coils and then placed in a nitrogen protection furnace for annealing. The temperature of the nitrogen protection furnace is raised from room temperature to 220° C. in 6 hours, and then the aluminum alloy foil coil is kept warm for 14 hours. The temperature of the nitrogen protection furnace is raised from 220° C. to 260 to 300° C. in 2 hours, and then the aluminum alloy foil coil is kept warm for 18 to 40 hours. After the insulation is completed, the aluminum alloy foil coil is taken out of the furnace and air-cooled to complete the production of the aluminum alloy foil. The aluminum alloy foil produced by the invention has a strength of 100-140 MPa and an elongation of ≥2%. The prepared aluminum alloy foil has a thickness of 0.04-0.1 mm and can be used as an adhesive tape aluminum foil, and can replace the existing 1 series and 8 series aluminum foil tapes.

[0043] In this embodiment, the aluminum alloy waste adopts 6061 aluminum alloy material to prepare 6061 aluminum alloy foil, which can be discarded cans, door and window materials, etc. Aluminum ingots are added to the aluminum alloy waste during the smelting process to keep the elements and their contents in the aluminum alloy solution in line with production requirements, thereby reducing pollution to the environment, realizing the secondary utilization of resources, further reducing resource consumption, and reducing production costs, which has good social and economic benefits.

[0044] The embodiments described above are only preferred embodiments of the invention and are not intended to limit the scope of implementation of the invention. Therefore, any equivalent changes or modifications made according to the technical solutions described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A method for producing recycled aluminum alloy foil for adhesive tape, characterized in that: The following steps are involved: Step 1: Smelting and casting aluminum alloy waste into aluminum alloy ingots, adding aluminum ingots during the smelting of aluminum alloy waste, controlling the aluminum alloy elements and the proportion of each element in the smelted aluminum alloy solution, and performing online degassing and deslagging operations on the aluminum alloy solution; Step 2: Milling the aluminum alloy ingot. The milling amount of the large surface of the aluminum alloy ingot is ≥20mm, the milling amount of the small surface is ≥10mm, and the thickness difference between the two sides of the aluminum alloy ingot is ≤3mm; Step 3: Perform a homogenization treatment on the aluminum alloy ingot, place the aluminum alloy ingot after the milling surface in a heating furnace, the homogenization treatment temperature is 550-580° C., and the furnace exit temperature is 500-520° C.; Step 4: hot rolling the aluminum alloy ingot, rough rolling the aluminum alloy ingot through 17 to 21 passes into a billet with a thickness of 38 mm, and then hot finishing rolling the billet through 4 passes into an aluminum alloy coil with a thickness of 5 to 6 mm; Step 5: cold rolling the aluminum alloy coil to form an aluminum alloy coil with a thickness of 0.6 mm through 4 passes; Step 6: Performing intermediate annealing treatment on the aluminum alloy coil, placing the aluminum alloy coil with a thickness of 0.6 mm in an annealing furnace protected by inert gas, and the annealing temperature is 330-380° C.; Step 7: cold foil rolling the aluminum alloy coil, rolling the aluminum alloy coil after intermediate annealing into a single-layer aluminum alloy foil product with a thickness of 0.04 to 0.1 mm through three passes; Step 8: Annealing the finished aluminum alloy foil. Cut the aluminum alloy foil coil after cold foil rolling into small coils and then anneal them. After the aluminum alloy foil coil is annealed and air-cooled, the production of the aluminum alloy foil is completed.

2. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 1, characterized in that: In the step 1, the aluminum alloy waste is placed in a smelting furnace, and aluminum ingots and a modifier Ti are added, and then smelted at 720-760° C. for 4-6 hours; The proportions of each element in the aluminum alloy solution are Si = 0.4 ~ 0.8%, Fe <0.4%, Cu = 0.15 ~ 0.4%, Mn <0.15%, Mg 0.8 ~ 1.2%, Cr = 0.04 ~ 0.35%, Zn <0.25%, Ti <0.15%, the rest is Al, and heavy metals (Cd + Hg + Pb) ≤ 0.1%.

3. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 2, characterized in that: In the step 1, the smelted aluminum alloy solution is refined in a refining furnace at 720-760° C. for 10-20 min, and high-purity argon inert gas is used for degassing and deslagging; The aluminum alloy solution is then introduced into a static furnace and refined again at 720-760°C for 30-50 minutes, and high-purity argon inert gas is used for degassing and deslagging. After the refining is completed, the slag is removed and the furnace is allowed to stand at 720-760°C for 20-40 minutes.

4. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 3, characterized in that: In the step 1, after the aluminum alloy solution in the static furnace has been statically placed, an online degassing and slag removal operation is performed, the aluminum alloy solution is introduced into a primary filtering device for filtration, and then introduced into an online degassing device for online degassing, and a high-purity argon inert gas high-speed rotary blowing method is used for online degassing, the speed of the online degassing graphite rotor is ≥300r / min, and the hydrogen content in the aluminum alloy solution after online degassing is ≤0.12ml / 100gAl; After online degassing, the aluminum alloy solution is sequentially introduced into a secondary filtration device and a tertiary filtration device to control the diameter of impurities in the aluminum alloy solution within <0.005mm.

5. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 4, characterized in that: In the step 1, after the online degassing and slag removal operations are completed, the aluminum alloy solution is cast into an aluminum alloy ingot at 690-720° C., with a casting rate of 40-60 mm / min, wherein the total time for online degassing and casting is 1.5-2.0 hours.

6. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 1, characterized in that: In the step 3, the temperature in the furnace of the heating furnace is controlled at 590-630°C. After the aluminum alloy ingot is placed in the heating furnace, the temperature is raised from room temperature to 550-580°C over 15-20 hours, and after being kept warm for 4-8 hours, the temperature is lowered from 550-580°C to 520-540°C over 1-3 hours, and after being kept warm for 2-4 hours, the ingot is taken out of the furnace.

7. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 1, characterized in that: In the step 4, the hot rolling opening temperature of the aluminum alloy ingot is 520-540°C, and the aluminum alloy ingot is subjected to hot rough rolling by a 1+4 hot rolling mill. After the hot rough rolling, the temperature of the aluminum alloy ingot is 430-450°C. After the hot rolling of the aluminum alloy ingot is completed, hot finish rolling is immediately performed, and the final rolling temperature is ≥300°C.

8. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 7, characterized in that: In the step 4, the aluminum alloy ingot is cooled and lubricated by emulsion during the hot rough rolling and hot finish rolling. The emulsion pressure during the hot rough rolling is 0.3-0.35 MPa and the temperature is 55-65° C.; the emulsion pressure during the hot finish rolling is 0.4-0.5 MPa and the temperature is 55-65° C., wherein the mass concentration of the emulsion is 5.0-6.0%.

9. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 1, characterized in that: In step 6, the inert gas is nitrogen, the furnace temperature of the annealing furnace is 380-450° C., and the aluminum alloy coil is kept warm for 3-8 hours after the temperature reaches 330-380° C. After the insulation is completed, it is taken out of the furnace and air-cooled to complete the intermediate annealing treatment.

10. The method for producing a recycled aluminum alloy foil for adhesive tape according to claim 1, characterized in that: In the step 8, the aluminum alloy foil coil with a thickness of 0.04 to 0.1 mm is cut into small coils and then placed in a nitrogen protection furnace for annealing. The temperature of the nitrogen protection furnace is raised from room temperature to 220° C. in 6 hours, and then the aluminum alloy foil coil is kept warm for 14 hours. The temperature of the nitrogen protection furnace is raised from 220° C. to 260 to 300° C. in 2 hours, and then the aluminum alloy foil coil is kept warm for 18 to 40 hours. After the insulation is completed, the aluminum alloy foil coil is taken out of the furnace and air-cooled to complete the production of the aluminum alloy foil.