Brass-aluminum alloy-brass composite material separation method, regenerated metal material and device

Abstract

The invention provides a separation method of a brass-aluminum alloy-brass composite material, a regenerated metal material and a device. The separation method of the brass-aluminum alloy-brass composite material comprises the steps that the brass-aluminum alloy-brass composite material is subjected to heat treatment, so that an intermetallic compound layer on the interface of brass and aluminum alloy is thickened to form an intermetallic compound and a gap layer, and the intermetallic compound layer is in a discontinuous state; the intermetallic compound and the gap layer are in a continuous state; and cooling and separating to respectively obtain brass and aluminum alloy. By means of the separation method, brass and aluminum alloy in the brass-aluminum alloy-brass composite material can be separated and recycled in an efficient, low-cost and environment-friendly mode.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, specifically to a method for separating brass-aluminum alloy-brass composite materials, recycled metal materials, and apparatus. Background Technology

[0002] Brass-aluminum alloy-brass composite coils and strips are a typical layered metal composite material. They combine brass (such as H65 and H66) with aluminum alloys (such as 5083) through physical or chemical methods to form a three-layer structure. This material, due to its combination of brass's high conductivity, aluminum alloy's lightweight properties, and cost advantages, is widely used in fields such as heat dissipation for electronic devices, conductive components in aerospace, and pipeline connections in petrochemical industries. For example, in LED lighting equipment, this composite material can replace pure copper, reducing material costs by 50-60% while meeting the requirements for conductivity and lightweighting.

[0003] However, during the production and use of such materials, a large amount of scrap, offcuts, and substandard waste is generated. Because these wastes are extremely thin and have high interfacial bonding strength, traditional recycling methods are unable to achieve efficient separation, resulting in the waste being recycled as low-value aluminum, causing resource waste and economic losses.

[0004] Therefore, developing an efficient, low-cost, and environmentally friendly separation method for brass-aluminum alloy-brass composite coils and strips has become a pressing technical challenge in this field. Summary of the Invention

[0005] In view of this, the present invention provides a method for separating brass-aluminum alloy-brass composite materials. This method can efficiently, cost-effectively, and environmentally friendly separate and recycle brass and aluminum alloy in brass-aluminum alloy-brass composite materials.

[0006] This invention provides a recycled metal material obtained by the separation method described above, which can be applied in industrial production.

[0007] The present invention provides an apparatus for implementing the above-described separation method. The apparatus has a simple structure and is suitable for widespread application.

[0008] This invention provides a method for separating brass-aluminum alloy-brass composite materials, comprising:

[0009] The brass-aluminum alloy-brass composite material is heat-treated to thicken the intermetallic compound layer at the interface between brass and aluminum alloy, forming an intermetallic compound and an interstitial layer. The intermetallic compound is in a discontinuous state, while the intermetallic compound and the interstitial layer are in a continuous state.

[0010] Cooling and separation yield brass and aluminum alloys, respectively.

[0011] The separation method described above, wherein the brass-aluminum alloy-brass composite material comprises a brass-aluminum alloy-brass composite strip, the brass-aluminum alloy-brass composite strip comprising a first brass layer, an aluminum alloy layer and a second brass layer stacked together; the thickness ratio of the first brass layer, the aluminum alloy layer and the second brass layer is 1:(1-10):1.

[0012] In the separation method described above, the thickness of the brass-aluminum alloy-brass composite strip is 0.13-2 mm, and the width is 5-1000 mm; and / or,

[0013] In the heat treatment, the temperature is 420-500℃ and the time is 1-3h.

[0014] In the separation method described above, the thickness of the intermetallic compound layer is 0.3-0.5 μm; and / or,

[0015] The thickness of the intermetallic compound and interstitial layer is 3-6 μm; and / or,

[0016] The brass is separated from the intermetallic compound and the interstitial layer by a zinc-containing insulating layer.

[0017] The separation method described above includes: using a winding machine with tension control of 5-25 kg for separation.

[0018] The separation method described above is characterized in that the thickness of the brass-aluminum alloy-brass composite strip is <1mm, and the heat treatment is performed at a temperature <460℃ and a time <1.5h; or,

[0019] The thickness of the brass-aluminum alloy-brass composite strip is 1-2 mm, and the heat treatment is carried out at a temperature of 460-500℃ for 1.5-3 hours.

[0020] The present invention provides a recycled metal material, wherein the recycled metal material is obtained by separation using the separation method described above.

[0021] The recycled metal material as described above, wherein the recycled metal material comprises a metal body and an intermetallic compound and a gap layer located on at least a portion of the surface of the metal body;

[0022] The metal body includes a brass substrate or an aluminum alloy substrate, and the intermetallic compound and interstitial layer include at least a copper-aluminum compound.

[0023] In the recycled metal material described above, the thickness H of the intermetallic compound and interstitial layer satisfies: 0 < H ≤ 6 μm; and / or,

[0024] The metal body includes a brass substrate, and a zinc-containing isolation layer is included between the brass substrate and the intermetallic compound and interstitial layer.

[0025] The present invention provides an apparatus for implementing the separation method of brass-aluminum alloy-brass composite material as described above, comprising: a heat treatment unit and a separation unit;

[0026] The heat treatment unit has an inlet for the brass-aluminum alloy-brass composite material, and the outlet of the heat treatment unit is connected to the inlet of the separation unit. The separation unit has a brass outlet and an aluminum alloy outlet.

[0027] In the separation method of the brass-aluminum alloy-brass composite material of the present invention, heat treatment can thicken the intermetallic compound layer between the brass and aluminum alloy interfaces of the brass-aluminum alloy-brass composite material and transform it from a discontinuous state to a continuous state, thereby obtaining intermetallic compounds and interstitial layers, which can enhance the brittle phase transformation effect. After cooling, brass and aluminum alloy can be obtained by separating along the intermetallic compound and interstitial layers. This separation method can efficiently, cost-effectively, and environmentally friendly separate and recycle brass and aluminum alloy in brass-aluminum alloy-brass composite materials.

[0028] The separation method of the present invention can separate recycled metal materials, and the obtained recycled metal materials can be directly applied to industrial production.

[0029] The separation device for brass-aluminum alloy-brass composite material of the present invention can implement the above-mentioned separation method. The separation device has a simple structure and is suitable for widespread application. Attached Figure Description

[0030] Figure 1 This is a SEM image of the interface between brass and aluminum alloy in the brass-aluminum alloy-brass composite material in Example 2 of the present invention;

[0031] Figure 2 This is a SEM image of the interface between brass and aluminum alloy in the brass-aluminum alloy-brass composite material during the heat treatment process in Embodiment 2 of the present invention;

[0032] Figure 3 This is a SEM image of the interface between brass and aluminum alloy in the brass-aluminum alloy-brass composite material after heat treatment in Example 2 of the present invention. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In existing technologies, the recycling of copper-aluminum composite materials mainly employs the following three methods:

[0035] Mechanical crushing and separation involves crushing copper-aluminum composite waste using crushers and pulverizers, followed by separation using magnetic separation and density differences. This method is suitable for copper-aluminum mixtures or profiles without strong bonding interfaces, but it is ineffective for layered composite thin plates and strips (<2mm) because separation at the interface is impossible, and the crushing process easily leads to material contamination and metal loss. Thermal melting separation involves heating to 680-1060℃ in an inert atmosphere, utilizing the difference in melting points of copper and aluminum alloys to separate them into solid and liquid phases. This method can process thick plates or profiles, but suffers from high energy consumption, severe aluminum adhesion to the copper surface due to high temperatures, and incomplete separation. Furthermore, it requires subsequent chemical treatment (such as acid washing) for further separation, increasing costs and causing environmental pollution. Electrolytic separation uses the copper-aluminum composite as the anode, separating copper and aluminum through an electrolytic reaction in an electrolyte. This method can obtain high-purity copper, but it requires large equipment investment, has low electrolytic efficiency, and improper treatment of the electrolyte (such as cuprous sulfate, organic nitriles, etc.) can easily cause environmental hazards, making large-scale application difficult.

[0036] The above methods all have significant drawbacks: First, they are poorly adaptable to thin sheet and strip materials (<2mm): existing methods cannot effectively process brass-aluminum alloy-brass coils and strips with a thickness of less than 2mm, due to the high interfacial bonding strength and the easy oxidation or overheating of the material; Second, they are costly to separate and pollute the environment: the thermal melting method requires high temperature and energy consumption, the electrolysis method relies on chemical reagents, and the mechanical crushing method results in low metal recovery rate; Third, the value of the recycled materials is low: due to incomplete separation, the waste is often recycled as low-value aluminum, failing to reflect the high-value attributes of copper.

[0037] In view of this, the inventors discovered in their research that heat treatment can affect the intermetallic compound layer of brass-aluminum alloy-brass composite strip, allowing the brass-aluminum alloy-brass composite strip to separate from the intermetallic compound layer, thereby obtaining brass and aluminum alloy.

[0038] A first aspect of the present invention provides a method for separating brass-aluminum alloy-brass composite materials, comprising:

[0039] Heat treatment is performed on brass-aluminum alloy-brass composite material to thicken the intermetallic compound layer at the interface between brass and aluminum alloy, forming an intermetallic compound and interstitial layer. The intermetallic compound layer is in a discontinuous state, while the intermetallic compound and interstitial layer is in a continuous state.

[0040] Cooling and separation yield brass and aluminum alloys, respectively.

[0041] The brass-aluminum alloy-brass composite material of the present invention refers to a composite material formed by combining brass and aluminum alloy, wherein there is an intermetallic compound layer between brass and aluminum alloy, and the intermetallic compound layer is a brittle layer.

[0042] Specifically, the separation method includes: heat-treating the brass-aluminum alloy-brass composite material to transform the intermetallic compound layer at the interface between brass and aluminum alloy from a discontinuous thin layer to a continuous thick layer to obtain an intermetallic compound and interstitial layer, thereby enhancing the brittle phase transformation effect of the intermetallic compound layer; and after cooling, separating the brass and aluminum alloy from the intermetallic compound and interstitial layer.

[0043] This invention controls the morphology of the intermetallic compound (IMC) layer at the interface through heat treatment, achieving controllable stratification of the brass-aluminum alloy-brass composite material interface. It also ensures the purity and integrity of the recycled metal materials (brass and aluminum alloy) obtained after separation, thereby recovering high-value brass and aluminum alloy separately and significantly improving the resource utilization value.

[0044] Compared with existing methods for separating copper-aluminum composite materials (e.g., thermal melting, electrolysis), the separation method of the present invention also has the advantages of short process, low energy consumption, no dependence on chemical reagents, and environmental friendliness.

[0045] In some embodiments of the present invention, the brass-aluminum alloy-brass composite material includes a first brass layer, an aluminum alloy layer, and a second brass layer stacked together. Furthermore, when used for separating brass-aluminum alloy-brass composite coils and strips, high-value single-metal brass and aluminum alloy can be recovered separately, significantly improving resource utilization value, and exhibiting high separation efficiency and high recovery rate.

[0046] The brass used in this invention is represented by H65 and H66, and the range of selectable materials includes: H58, H59, H60, H62, H62.5, H63, H65, H66, H68, H70, H80, H85, H90, H95, and H96 of ordinary brass listed in Table 3 of GB / T 5231-2022. The aluminum alloy is represented by 5-series aluminum alloy 5083, and the range of selectable materials includes: 1-series, 3-series, 5-series, and 8-series aluminum alloys listed in GB / T3190-2022.

[0047] Furthermore, the separation method of the present invention is particularly suitable for a thickness ratio of the first brass layer, the aluminum alloy layer, and the second brass layer of 1:(1-10):1; and / or,

[0048] Brass-aluminum alloy-brass composite coils and strips with a thickness of 0.13-2mm and a width of 5-1000mm fill the gap in existing technologies that cannot effectively separate composite materials with a thickness of ≤2mm.

[0049] In some embodiments of the present invention, when the heat treatment temperature is 420-500°C and the time is 1-3 hours, the brittleness of the intermetallic compound layer can be improved more effectively while saving energy, and the separation of brass and aluminum alloy can be achieved more efficiently.

[0050] Furthermore, the thickness of the intermetallic compound layer is 0.3-0.5 μm; when the thickness of the intermetallic compound and interstitial layer obtained after heat treatment is 3-6 μm, the intermetallic compound and interstitial layer are more brittle, which can achieve more efficient separation of brass and aluminum alloy.

[0051] In some embodiments of the present invention, heat treatment can induce zinc in brass to precipitate at the interface, so that there is a zinc-containing isolation layer between brass and intermetallic compounds and interstitial layers. Due to the hexagonal close-packed (HCP) structure characteristics of zinc (poor plasticity and high brittleness) and the brittle characteristics of intermetallic compounds and interstitial layers, controllable delamination of brass and aluminum alloy can be achieved, thereby efficiently separating brass and aluminum alloy.

[0052] In some embodiments of the present invention, the separation includes using a winding machine with tension control of 5-25 kg to separate copper and aluminum efficiently without causing the material to break.

[0053] In this invention, the heat treatment parameters can be selected based on the thickness of the brass-aluminum alloy-brass composite strip to ensure that brass-aluminum alloy-brass composite strips of different specifications can form effective delamination after heat treatment, while avoiding adhesion problems caused by overheating or excessive oxidation. For example,

[0054] For brass-aluminum alloy-brass composite coils and strips with a thickness <1mm, the heat treatment temperature is <460℃ and the time is <1.5h; or,

[0055] The thickness of the brass-aluminum alloy-brass composite coil strip is 1-2mm. During the heat treatment, the temperature is 460-500℃ and the time is 1.5-3h.

[0056] A second aspect of the present invention provides a recycled metal material obtained by the separation method of the first aspect. This recycled metal material can be applied to industrial production and has high economic benefits.

[0057] In some embodiments of the present invention, the recycled metal material includes a metal body and an intermetallic compound and a gap layer located on at least a portion of the surface of the metal body;

[0058] The metal matrix includes a brass matrix or an aluminum alloy matrix, and the intermetallic compound and interstitial layer include at least a copper-aluminum compound.

[0059] In this invention, when the metal body is a brass substrate, the recycled metal material includes a brass substrate and an intermetallic compound and a gap layer located on the surface of a portion of the brass substrate; when the metal body includes an aluminum alloy substrate, the recycled metal material includes an aluminum alloy substrate and an intermetallic compound layer located on the surface of a portion of the aluminum alloy substrate.

[0060] Furthermore, the thickness H of the intermetallic compound and interstitial layer satisfies: 0 < H ≤ 6 μm.

[0061] Furthermore, when the metal body includes a brass substrate, a zinc-containing insulating layer is included between the brass substrate and the intermetallic compound and interstitial layer.

[0062] A third aspect of the present invention provides an apparatus for implementing the method for separating brass-aluminum alloy-brass composite materials of the first aspect, comprising: a heat treatment unit and a separation unit;

[0063] The heat treatment unit has a brass-aluminum alloy-brass composite material inlet, and the outlet of the heat treatment unit is connected to the inlet of the separation unit. The separation unit has a brass outlet and an aluminum alloy outlet.

[0064] Specifically, the brass-aluminum alloy-brass composite material enters the heat treatment unit through the brass-aluminum alloy-brass composite material inlet. Heat treatment is performed in the heat treatment unit. Due to the brittleness of the intermetallic compound layer, the interface between the brass and aluminum alloy delaminates, creating gaps and forming intermetallic compounds and gap layers. Then, the heat-treated brass-aluminum alloy-brass composite material exits through the outlet of the heat treatment unit and enters the separation unit through the inlet. In the separation unit, the brass and aluminum alloy are separated from the intermetallic compounds and gap layers. The brass exits through the brass outlet of the separation unit, and the aluminum alloy exits through the aluminum alloy outlet of the separation unit.

[0065] The separation device of the present invention can implement the above-described separation method, and the separation device has a simple structure and is suitable for widespread application.

[0066] The present invention will be further described below with reference to specific embodiments:

[0067] Example 1

[0068] The apparatus for separating the brass-aluminum alloy-brass composite material in this embodiment includes a heat treatment unit and a separation unit;

[0069] The heat treatment unit has a brass-aluminum alloy-brass composite material inlet, and the outlet of the heat treatment unit is connected to the inlet of the separation unit. The separation unit has a brass outlet and an aluminum alloy outlet.

[0070] The heat treatment unit is a box-type annealing furnace, and the separation unit is a winding machine.

[0071] Example 2

[0072] The separation method for brass-aluminum alloy-brass composite coil strip in this embodiment uses the apparatus of Example 1, and includes:

[0073] The verification was conducted using brass-aluminum alloy-brass edge wire from the production process. A 0.48mm thick and 10mm wide brass-aluminum alloy-brass edge wire was selected, with a brass:aluminum alloy:brass thickness ratio of 1:6:1, where the brass was C2680 and the aluminum alloy was 5083.

[0074] The material was placed in a box-type annealing furnace and heated to 445℃ for 1 hour. After being removed from the furnace, it was allowed to cool naturally. The material delaminated, and then peeled off and recycled along the delamination lines. The single-metal brass and single-metal 5083 aluminum alloy were collected separately using a winding machine with a tension of 15 kg. A total of 220 kg of edge wire material was input, and after peeling, 114 kg of brass and 103 kg of 5083 aluminum alloy were finally produced.

[0075] Brass includes a brass substrate and an intermetallic compound and interstitial layer located on at least a portion of the surface of the brass substrate, and a zinc-containing insulating layer is included between the brass substrate and the intermetallic compound and interstitial layer; aluminum alloy includes an aluminum alloy substrate and an intermetallic compound and interstitial layer located on at least a portion of the surface of the aluminum alloy substrate; the intermetallic compound and interstitial layer include a copper-aluminum compound.

[0076] Example 3

[0077] The separation method for brass-aluminum alloy-brass composite coil strip in this embodiment uses the apparatus of Example 1, and includes:

[0078] Waste from the brass-aluminum alloy-brass process was used, with a brass:aluminum alloy:brass thickness ratio of 1:5:1, where the brass was C2680 and the aluminum alloy was 5083. The material specifications were 0.18mm thick and 180mm wide. The material was placed in a box-type annealing furnace, heated to 430℃, and held for 1 hour. After being removed from the furnace, it was allowed to cool naturally. Once the material delaminated, it was peeled off and decomposed along the delamination lines for recycling. A winding machine with a tension of 8Kg was used to separately recover the single-metal brass and single-metal 5083 aluminum alloy. A total of 350Kg of material was input, and after decomposition, the final output was 195Kg of brass and 147Kg of 5083 aluminum alloy.

[0079] Brass includes a brass substrate and an intermetallic compound and interstitial layer located on at least a portion of the surface of the brass substrate, and a zinc-containing insulating layer is included between the brass substrate and the intermetallic compound and interstitial layer; aluminum alloy includes an aluminum alloy substrate and an intermetallic compound and interstitial layer located on at least a portion of the surface of the aluminum alloy substrate; the intermetallic compound and interstitial layer include a copper-aluminum compound.

[0080] Example 4

[0081] The separation method for brass-aluminum alloy-brass composite coil strip in this embodiment uses the apparatus of Example 1, and includes:

[0082] The process uses brass-aluminum alloy-brass wire with a brass:aluminum alloy:brass thickness ratio of 1:7:1, where the brass is H70 and the aluminum alloy is 5083. The material specifications are 0.42mm thick and 15mm wide, and 0.38mm thick and 15mm wide, with weights of 336kg and 154kg respectively. Both types of materials are placed in a box-type annealing furnace, heated to 445℃, and held for 1.5 hours. After furnace removal, they are allowed to cool naturally. At the points where delamination occurs, the material is peeled off and recycled. A winding machine with a tension of 15kg is used to separately recover the single-metal brass H70 and the single-metal aluminum alloy 5083. A total of 490kg of material was input, and after decomposition, 227kg of brass and 263kg of aluminum alloy were finally produced.

[0083] Brass includes a brass substrate and an intermetallic compound and interstitial layer located on at least a portion of the surface of the brass substrate, and a zinc-containing insulating layer is included between the brass substrate and the intermetallic compound and interstitial layer; aluminum alloy includes an aluminum alloy substrate and an intermetallic compound and interstitial layer located on at least a portion of the surface of the aluminum alloy substrate; the intermetallic compound and interstitial layer include a copper-aluminum compound.

[0084] Example 5

[0085] The separation method of brass-aluminum alloy-brass composite coil strip in this embodiment is basically the same as that in Embodiment 2, except that the heating temperature is 550℃.

[0086] Example 6

[0087] The separation method of the brass-aluminum alloy-brass composite coil strip in this embodiment is basically the same as that in Embodiment 2, except that the heating temperature is 400℃.

[0088] Example 7

[0089] The separation method of the brass-aluminum alloy-brass composite coil strip in this embodiment is basically the same as that in Embodiment 2, except that the heat preservation time is 0.5h.

[0090] Example 8

[0091] The separation method of the brass-aluminum alloy-brass composite coil strip in this embodiment is basically the same as that in Embodiment 2, except that the heat preservation time is 5 hours.

[0092] Performance testing

[0093] 1) SEM testing

[0094] SEM tests were performed on the interface between brass and aluminum alloy before and after heat treatment of the brass-aluminum alloy-brass composite material in the examples.

[0095] Figure 1 This is a SEM image of the interface between brass and aluminum alloy in the brass-aluminum alloy-brass composite material in Example 2 of the present invention; Figure 2 This is a SEM image of the interface between brass and aluminum alloy in the brass-aluminum alloy-brass composite material during the heat treatment process in Embodiment 2 of the present invention; Figure 3 This is a SEM image of the interface between brass and aluminum alloy in the heat-treated brass-aluminum alloy-brass composite material of Example 2 of the present invention. Figure 1-3 It can be seen that the interface between brass and aluminum alloy in the brass-aluminum alloy-brass composite material has a discontinuous intermetallic composite layer. During heat treatment, the intermetallic composite layer grows continuously. After heat treatment, the interface between brass and aluminum alloy delaminates, forming intermetallic compounds and interstitial layers. The thickness H of the intermetallic compounds and interstitial layers satisfies: 0 < H ≤ 6 μm. It can be considered that the separated brass includes a brass matrix and intermetallic compounds and interstitial layers located on at least a portion of the surface of the brass matrix; the separated aluminum alloy includes an aluminum alloy matrix and intermetallic compounds and interstitial layers located on at least a portion of the surface of the aluminum alloy matrix, and the thickness H of the intermetallic compounds and interstitial layers satisfies: 0 < H ≤ 6 μm.

[0096] 2) Recovery rate test

[0097] The recovery rates of the separation methods in the examples were calculated respectively, and the results are shown in Table 1. Recovery rate = mass of brass-aluminum alloy-brass composite material / (mass of brass + mass of aluminum alloy) * 100%.

[0098] Table 1

[0099]

[0100] As can be seen from Table 1, the separation method of brass-aluminum alloy-brass composite material in this embodiment of the invention can efficiently separate aluminum alloy and brass with a high recovery rate, and it is environmentally friendly as it does not use chemical reagents during the separation process. Furthermore, as can be seen from Examples 2 and 5-6, the separation efficiency of brass and aluminum alloy can be further improved by further selecting the temperature and time of the heat treatment process.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for separating brass-aluminum alloy-brass composite materials, characterized in that, include: The brass-aluminum alloy-brass composite material is heat-treated to thicken the intermetallic compound layer at the interface between brass and aluminum alloy, forming an intermetallic compound and an interstitial layer. The intermetallic compound layer is discontinuous, while the intermetallic compound and interstitial layer are continuous. Cooling and separation yield brass and aluminum alloys, respectively.

2. The separation method according to claim 1, characterized in that, In the heat treatment, the temperature is 420-500℃ and the time is 1-3 hours; and / or, The separation process includes using a winding machine with tension control of 5-25 kg for separation.

3. The separation method according to claim 1 or 2, characterized in that, The brass-aluminum alloy-brass composite material includes brass-aluminum alloy-brass composite coils and strips; The brass-aluminum alloy-brass composite strip includes a first brass layer, an aluminum alloy layer, and a second brass layer stacked together; the thickness ratio of the first brass layer, the aluminum alloy layer, and the second brass layer is 1:(1-10):1; and / or, The thickness of the brass-aluminum alloy-brass composite coil strip is 0.13-2mm, and the width is 5-1000mm.

4. The separation method according to claim 3, characterized in that, The thickness of the brass-aluminum alloy-brass composite coil / strip is <1mm, and the heat treatment is performed at a temperature <460℃ for a time <1.5h; or, The thickness of the brass-aluminum alloy-brass composite coil strip is 1-2 mm, and the heat treatment is carried out at a temperature of 460-500℃ for 1.5-3 hours.

5. The separation method according to any one of claims 1-4, characterized in that, The thickness of the intermetallic compound layer is 0.3-0.5 μm; and / or, The thickness of the intermetallic compound and the interstitial layer is 3-6 μm.

6. The separation method according to any one of claims 1-5, characterized in that, The brass is separated from the intermetallic compound and the interstitial layer by a zinc-containing insulating layer.

7. A recycled metal material, characterized in that, The recycled metal material is obtained by separation using the separation method described in any one of claims 1-6.

8. The recycled metal material according to claim 7, characterized in that, The recycled metal material includes a metal body and an intermetallic compound and a gap layer located on at least a portion of the surface of the metal body; The metal body includes a brass substrate or an aluminum alloy substrate, and the intermetallic compound and interstitial layer include at least a copper-aluminum compound.

9. The recycled metal material according to claim 8, characterized in that, The thickness H of the intermetallic compound and interstitial layer satisfies: 0 < H ≤ 6 μm; and / or, The metal body includes a brass substrate, and a zinc-containing isolation layer is included between the brass substrate and the intermetallic compound and interstitial layer.

10. An apparatus for implementing the separation method of brass-aluminum alloy-brass composite material according to any one of claims 1-6, characterized in that, include: Heat treatment unit and separation unit; The heat treatment unit has an inlet for the brass-aluminum alloy-brass composite material, and the outlet of the heat treatment unit is connected to the inlet of the separation unit. The separation unit has a brass outlet and an aluminum alloy outlet.

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