Waste aluminum recycling and reprocessing method

Abstract

The invention relates to the technical field of waste aluminum regeneration, in particular to a waste aluminum recycling and reprocessing method which comprises the following steps: (1) collecting a waste aluminum material; (2) the aluminum scrap material is added into a crusher to be crushed, and a crushed aluminum scrap material is obtained; (3) obtaining a paint-removed crushed aluminum scrap material; (4) adding the obtained paint-removed waste aluminum crushed material into a smelting furnace, and performing smelting treatment to obtain molten waste aluminum liquid; (5) refining the molten waste aluminum liquid; (6) the molten waste aluminum liquid obtained after refining treatment is poured into a mold; and (7) performing cooling shaping, and performing demolding. Compared with production and smelting of primary aluminum, energy consumption required by recycling of the waste aluminum is much lower, emission of greenhouse gas and generation of other pollutants can be reduced, emission of the pollutants can be reduced by recycling and treating the waste aluminum, and the ecological environment can be protected.

Description

Technical Field

[0001] The invention relates to the technical field of waste aluminum regeneration, in particular to a waste aluminum recycling and reprocessing method. Background Art

[0002] Scrap aluminum recycling plays an important role in environmental protection, economic and social sustainable development. Scrap aluminum can be reused after recycling, which greatly saves natural resources such as bauxite. It is estimated that recycling 1 ton of scrap aluminum can save about 2 tons of bauxite, thus achieving the goal of maximizing resource utilization efficiency.

[0003] In addition, by recycling and reusing scrap aluminum, the exploitation of natural resources can be greatly reduced, and the demand for primary aluminum can be reduced, thereby reducing the amount of bauxite mining, which can greatly avoid the damage to the natural environment and ecosystem during the mining of aluminum resources. Compared with extracting aluminum from bauxite, the energy consumption required to recycle scrap aluminum is much lower, so it can significantly reduce greenhouse gas emissions and help address global climate change.

[0004] To sum up, scrap aluminum recycling plays an important role in resource conservation, environmental protection, economic benefits, and promoting circular economy and green development.

[0005] However, the existing technology does not adequately handle the waste aluminum recycling process, resulting in a significant reduction in the quality of the waste aluminum castings produced, limiting their use.

[0006] Based on this, the present invention provides a method for recycling and reprocessing waste aluminum to solve the corresponding problem. Summary of the invention

[0007] In view of the problems in the prior art, the present invention provides a method for recycling and reprocessing waste aluminum.

[0008] The technical solution adopted by the present invention to solve the technical problem is: a method for recycling and reprocessing waste aluminum, comprising the following steps:

[0009] (1) Collecting scrap aluminum materials;

[0010] (2) adding the waste aluminum material to a crusher for crushing to obtain waste aluminum crushed material;

[0011] (3) adding the scrap aluminum crushed material to the paint removal liquid, performing paint removal treatment on the scrap aluminum crushed material, and then filtering, taking out, and drying to obtain the paint-removed scrap aluminum crushed material;

[0012] (4) adding the above-obtained paint-removed scrap aluminum crushed material into a smelting furnace, and subjecting it to smelting treatment to obtain molten scrap aluminum liquid;

[0013] Adjust the melting temperature to 700-720℃ and stir for 30min;

[0014] (5) refining the molten waste aluminum liquid;

[0015] (6) pouring the molten waste aluminum liquid after the refining process into a mold;

[0016] (7) After cooling and shaping, demoulding is performed.

[0017] As a further technical solution: the waste aluminum material in step (1) includes: a mixture of any one or more of waste aluminum doors and windows, waste aluminum plates, waste aluminum wires, waste aluminum casings, and waste automobile aluminum parts.

[0018] As a further technical solution: in step (2), the waste aluminum material is crushed as follows:

[0019] The scrap aluminum material is added to the crusher for crushing. The crusher used is a 1600 type metal crusher with a feed size of 1600 mm, a discharge size of 20-50 mm, a production capacity of 20 tons / hour, a motor power of 400 kilowatts, a speed of 750 rpm, 10 pairs of hammers, and an equipment weight of 25 tons.

[0020] As a further technical solution: the paint removal liquid in step (3) comprises the following components by weight:

[0021] 15 parts of hexanol, 3 parts of heptanol, 1 part of benzoic acid, 2-3 parts of surfactant, 2 parts of cetylpyridinium chloride, 1 part of acetamide, 3-5 parts of adsorption-modified diatomaceous earth, 5 parts of disodium hydrogen phosphate, and 40 parts of dichloromethane;

[0022] Wherein, the surfactant is stearic acid.

[0023] As a further technical solution: the preparation method of the adsorption modified diatomite is:

[0024] First, diatomaceous earth was mixed with the surfactant solution, the temperature was adjusted to 80°C, stirred for 40 minutes, then filtered, washed to neutrality, and dried to constant weight;

[0025] The diatomaceous earth treated as above is added into a resistance furnace, subjected to multi-stage heat treatment, and finally cooled to room temperature to obtain adsorption-modified diatomaceous earth.

[0026] As a further technical solution: the mixing ratio of the diatomaceous earth and the surfactant solution is 12-14 g: 150 mL;

[0027] The surfactant solution preparation method is as follows:

[0028] Sodium dodecylbenzene sulfonate and water are mixed together, and then stirred at room temperature for 30 minutes to obtain a surfactant solution;

[0029] Wherein, the mass fraction of the surfactant solution is 10%.

[0030] As a further technical solution: the multi-stage heat treatment is:

[0031] First adjust the temperature to 400-415℃, then keep it warm for 10 minutes;

[0032] Then adjust the temperature to 500-520℃ and keep warm for 20 minutes;

[0033] Finally, adjust the temperature to 580-600℃ and keep warm for 40 minutes.

[0034] As a further technical solution: the refining process in step (5) is as follows:

[0035] Nitrogen was introduced for 30 min at a flow rate of 1 L / min.

[0036] After the nitrogen is passed through, the scum is removed by filtration to complete the refining process.

[0037] As a further technical solution: the pouring temperature in step (6) is 580°C.

[0038] Beneficial effects of the present invention:

[0039] The present invention

[0040] Compared with mining and smelting primary aluminum, the energy consumption required for recycling and reusing scrap aluminum in the present invention is much lower, which helps to reduce greenhouse gas emissions and the generation of other pollutants. By recycling and processing scrap aluminum, pollutant emissions can be reduced and the ecological environment can be protected.

[0041] By recycling and reusing waste resources such as scrap aluminum, resource recycling and sustainable economic development can be achieved. This helps to build a resource-saving and environmentally friendly society. The present invention uses paint removal liquid in the process of scrap aluminum recycling, mainly through the chemical reaction or physical dissolution of the various components contained in the paint with the paint, thereby destroying the adhesion layer of the paint and peeling it off from the aluminum alloy surface, and these components can penetrate into the paint, decompose its structure, make the paint soft and easy to remove, and greatly improve the paint removal rate of the scrap aluminum surface paint.

[0042] Commercially available paint removal liquids may cause certain damage to the surface of the scrap aluminum substrate, such as slight corrosion or discoloration, while the paint removal liquid prepared by the present invention has the characteristic of protecting the scrap aluminum substrate and can reduce damage to the scrap aluminum substrate while removing the paint.

[0043] After the waste aluminum is recycled by the method of the present invention, the obtained waste aluminum product has high mechanical property guarantee and can be used in most occasions. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0045] Example 1

[0046] A method for recycling and reprocessing waste aluminum comprises the following steps:

[0047] (1) Collecting scrap aluminum materials; scrap aluminum materials include: scrap aluminum plates.

[0048] (2) adding the waste aluminum material to a crusher for crushing to obtain waste aluminum crushed material; crushing the waste aluminum material as follows:

[0049] The scrap aluminum material is added to the crusher for crushing. The crusher used is a 1600 type metal crusher with a feed size of 1600 mm, a discharge size of 20 mm, a production capacity of 20 tons / hour, a motor power of 400 kilowatts, a speed of 750 rpm, 10 pairs of hammers, and an equipment weight of 25 tons.

[0050] (3) adding the scrap aluminum crushed material to the paint removal liquid, performing paint removal treatment on the scrap aluminum crushed material, and then filtering, taking out, and drying to obtain the paint-removed scrap aluminum crushed material; the paint removal liquid comprises the following components by weight:

[0051] 15 parts of hexanol, 3 parts of heptanol, 1 part of benzoic acid, 2 parts of surfactant, 2 parts of cetylpyridinium chloride, 1 part of acetamide, 3 parts of adsorption-modified diatomaceous earth, 5 parts of disodium hydrogen phosphate, and 40 parts of dichloromethane;

[0052] Wherein, the surfactant is stearic acid.

[0053] The preparation method of adsorption modified diatomaceous earth is:

[0054] First, diatomaceous earth was mixed with the surfactant solution, the temperature was adjusted to 80°C, stirred for 40 minutes, then filtered, washed to neutrality, and dried to constant weight;

[0055] The diatomaceous earth treated as above is added into a resistance furnace, subjected to multi-stage heat treatment, and finally cooled to room temperature to obtain adsorption-modified diatomaceous earth.

[0056] The mixing ratio of the diatomaceous earth and the surfactant solution is 12 g: 150 mL;

[0057] The surfactant solution preparation method is as follows:

[0058] Sodium dodecylbenzene sulfonate and water are mixed together, and then stirred at room temperature for 30 minutes to obtain a surfactant solution;

[0059] Wherein, the mass fraction of the surfactant solution is 10%.

[0060] Multi-stage heat treatment is:

[0061] First adjust the temperature to 400°C, then keep it warm for 10 minutes;

[0062] Then adjust the temperature to 500°C and keep it warm for 20 minutes;

[0063] Finally, adjust the temperature to 580°C and keep warm for 40 minutes.

[0064] (4) adding the above-obtained paint-removed scrap aluminum crushed material into a smelting furnace, and subjecting it to smelting treatment to obtain molten scrap aluminum liquid;

[0065] Adjust the melting temperature to 700°C and stir for 30 minutes;

[0066] (5) refining the molten waste aluminum liquid; the refining process is as follows:

[0067] Nitrogen was introduced for 30 min at a flow rate of 1 L / min.

[0068] After the nitrogen is passed through, the scum is removed by filtration to complete the refining process.

[0069] (6) The molten waste aluminum liquid after the refining treatment is poured into the mold; the pouring temperature is 580°C.

[0070] (7) After cooling and shaping, demoulding is performed.

[0071] Example 2

[0072] A method for recycling and reprocessing waste aluminum comprises the following steps:

[0073] (1) Collecting scrap aluminum materials; scrap aluminum materials include: scrap aluminum plates.

[0074] (2) adding the waste aluminum material to a crusher for crushing to obtain waste aluminum crushed material; crushing the waste aluminum material as follows:

[0075] The scrap aluminum material is added to the crusher for crushing. The crusher used is a 1600 type metal crusher with a feed size of 1600 mm, a discharge size of 20 mm, a production capacity of 20 tons / hour, a motor power of 400 kilowatts, a speed of 750 rpm, 10 pairs of hammers, and an equipment weight of 25 tons.

[0076] (3) adding the scrap aluminum crushed material to the paint removal liquid, performing paint removal treatment on the scrap aluminum crushed material, and then filtering, taking out, and drying to obtain the paint-removed scrap aluminum crushed material; the paint removal liquid comprises the following components by weight:

[0077] 15 parts of hexanol, 3 parts of heptanol, 1 part of benzoic acid, 2.5 parts of surfactant, 2 parts of cetylpyridinium chloride, 1 part of acetamide, 3.5 parts of adsorption-modified diatomaceous earth, 5 parts of disodium hydrogen phosphate, and 40 parts of dichloromethane;

[0078] Wherein, the surfactant is stearic acid.

[0079] The preparation method of adsorption modified diatomaceous earth is:

[0080] First, diatomaceous earth was mixed with the surfactant solution, the temperature was adjusted to 80°C, stirred for 40 minutes, then filtered, washed to neutrality, and dried to constant weight;

[0081] The diatomaceous earth treated as above is added into a resistance furnace, subjected to multi-stage heat treatment, and finally cooled to room temperature to obtain adsorption-modified diatomaceous earth.

[0082] The mixing ratio of the diatomaceous earth and the surfactant solution is 13 g: 150 mL;

[0083] The surfactant solution preparation method is as follows:

[0084] Sodium dodecylbenzene sulfonate and water are mixed together, and then stirred at room temperature for 30 minutes to obtain a surfactant solution;

[0085] Wherein, the mass fraction of the surfactant solution is 10%.

[0086] Multi-stage heat treatment is:

[0087] First adjust the temperature to 402°C, then keep it warm for 10 minutes;

[0088] Then adjust the temperature to 510°C and keep warm for 20 minutes;

[0089] Finally, adjust the temperature to 585°C and keep warm for 40 minutes.

[0090] (4) adding the above-obtained paint-removed scrap aluminum crushed material into a smelting furnace, and subjecting it to smelting treatment to obtain molten scrap aluminum liquid;

[0091] Adjust the melting temperature to 706°C and stir for 30 minutes;

[0092] (5) refining the molten waste aluminum liquid; the refining process is as follows:

[0093] Nitrogen was introduced for 30 min at a flow rate of 1 L / min.

[0094] After the nitrogen is passed through, the scum is removed by filtration to complete the refining process.

[0095] (6) The molten waste aluminum liquid after the refining treatment is poured into the mold; the pouring temperature is 580°C.

[0096] (7) After cooling and shaping, demoulding is performed.

[0097] Example 3

[0098] A method for recycling and reprocessing waste aluminum comprises the following steps:

[0099] (1) Collecting scrap aluminum materials; scrap aluminum materials include: scrap aluminum plates.

[0100] (2) adding the waste aluminum material to a crusher for crushing to obtain waste aluminum crushed material; crushing the waste aluminum material as follows:

[0101] The scrap aluminum material is added to the crusher for crushing. The crusher used is a 1600 type metal crusher with a feed size of 1600 mm, a discharge size of 20 mm, a production capacity of 20 tons / hour, a motor power of 400 kilowatts, a speed of 750 rpm, 10 pairs of hammers, and an equipment weight of 25 tons.

[0102] (3) adding the scrap aluminum crushed material to the paint removal liquid, performing paint removal treatment on the scrap aluminum crushed material, and then filtering, taking out, and drying to obtain the paint-removed scrap aluminum crushed material; the paint removal liquid comprises the following components by weight:

[0103] 15 parts of hexanol, 3 parts of heptanol, 1 part of benzoic acid, 2.8 parts of surfactant, 2 parts of cetylpyridinium chloride, 1 part of acetamide, 4 parts of adsorption-modified diatomaceous earth, 5 parts of disodium hydrogen phosphate, and 40 parts of dichloromethane;

[0104] Wherein, the surfactant is stearic acid.

[0105] The preparation method of adsorption modified diatomaceous earth is:

[0106] First, diatomaceous earth was mixed with the surfactant solution, the temperature was adjusted to 80°C, stirred for 40 minutes, then filtered, washed to neutrality, and dried to constant weight;

[0107] The diatomaceous earth treated as above is added into a resistance furnace, subjected to multi-stage heat treatment, and finally cooled to room temperature to obtain adsorption-modified diatomaceous earth.

[0108] The mixing ratio of the diatomaceous earth and the surfactant solution is 13 g: 150 mL;

[0109] The surfactant solution preparation method is as follows:

[0110] Sodium dodecylbenzene sulfonate and water are mixed together, and then stirred at room temperature for 30 minutes to obtain a surfactant solution;

[0111] Wherein, the mass fraction of the surfactant solution is 10%.

[0112] Multi-stage heat treatment is:

[0113] First adjust the temperature to 410°C, then keep it warm for 10 minutes;

[0114] Then adjust the temperature to 515°C and keep warm for 20 minutes;

[0115] Finally, adjust the temperature to 590°C and keep warm for 40 minutes.

[0116] (4) adding the above-obtained paint-removed scrap aluminum crushed material into a smelting furnace, and subjecting it to smelting treatment to obtain molten scrap aluminum liquid;

[0117] Adjust the melting temperature to 712°C and stir for 30 minutes;

[0118] (5) refining the molten waste aluminum liquid; the refining process is as follows:

[0119] Nitrogen was introduced for 30 min at a flow rate of 1 L / min.

[0120] After the nitrogen is passed through, the scum is removed by filtration to complete the refining process.

[0121] (6) The molten waste aluminum liquid after the refining treatment is poured into the mold; the pouring temperature is 580°C.

[0122] (7) After cooling and shaping, demoulding is performed.

[0123] Example 4

[0124] A method for recycling and reprocessing waste aluminum comprises the following steps:

[0125] (1) Collecting scrap aluminum materials; scrap aluminum materials include: scrap aluminum plates.

[0126] (2) adding the waste aluminum material to a crusher for crushing to obtain waste aluminum crushed material; crushing the waste aluminum material as follows:

[0127] The scrap aluminum material is added to the crusher for crushing. The crusher used is a 1600 type metal crusher with a feed size of 1600 mm, a discharge size of 20 mm, a production capacity of 20 tons / hour, a motor power of 400 kilowatts, a speed of 750 rpm, 10 pairs of hammers, and an equipment weight of 25 tons.

[0128] (3) adding the scrap aluminum crushed material to the paint removal liquid, performing paint removal treatment on the scrap aluminum crushed material, and then filtering, taking out, and drying to obtain the paint-removed scrap aluminum crushed material; the paint removal liquid comprises the following components by weight:

[0129] 15 parts of hexanol, 3 parts of heptanol, 1 part of benzoic acid, 2.5 parts of surfactant, 2 parts of cetylpyridinium chloride, 1 part of acetamide, 4.5 parts of adsorption-modified diatomaceous earth, 5 parts of disodium hydrogen phosphate, and 40 parts of dichloromethane;

[0130] Wherein, the surfactant is stearic acid.

[0131] The preparation method of adsorption modified diatomaceous earth is:

[0132] First, diatomaceous earth was mixed with the surfactant solution, the temperature was adjusted to 80°C, stirred for 40 minutes, then filtered, washed to neutrality, and dried to constant weight;

[0133] The diatomaceous earth treated as above is added into a resistance furnace, subjected to multi-stage heat treatment, and finally cooled to room temperature to obtain adsorption-modified diatomaceous earth.

[0134] The mixing ratio of the diatomaceous earth and the surfactant solution is 13 g: 150 mL;

[0135] The surfactant solution preparation method is as follows:

[0136] Sodium dodecylbenzene sulfonate and water are mixed together, and then stirred at room temperature for 30 minutes to obtain a surfactant solution;

[0137] Wherein, the mass fraction of the surfactant solution is 10%.

[0138] Multi-stage heat treatment is:

[0139] First adjust the temperature to 408°C, then keep it warm for 10 minutes;

[0140] Then adjust the temperature to 510°C and keep warm for 20 minutes;

[0141] Finally, adjust the temperature to 595°C and keep warm for 40 minutes.

[0142] (4) adding the above-obtained paint-removed scrap aluminum crushed material into a smelting furnace, and subjecting it to smelting treatment to obtain molten scrap aluminum liquid;

[0143] Adjust the melting temperature to 710°C and stir for 30 minutes;

[0144] (5) refining the molten waste aluminum liquid; the refining process is as follows:

[0145] Nitrogen was introduced for 30 min at a flow rate of 1 L / min.

[0146] After the nitrogen is passed through, the scum is removed by filtration to complete the refining process.

[0147] (6) The molten waste aluminum liquid after the refining treatment is poured into the mold; the pouring temperature is 580°C.

[0148] (7) After cooling and shaping, demoulding is performed.

[0149] Example 5

[0150] A method for recycling and reprocessing waste aluminum comprises the following steps:

[0151] (1) Collecting scrap aluminum materials; scrap aluminum materials include: scrap aluminum plates.

[0152] (2) adding the waste aluminum material to a crusher for crushing to obtain waste aluminum crushed material; crushing the waste aluminum material as follows:

[0153] The scrap aluminum material is added to the crusher for crushing. The crusher used is a 1600 type metal crusher with a feed size of 1600 mm, a discharge size of 20 mm, a production capacity of 20 tons / hour, a motor power of 400 kilowatts, a speed of 750 rpm, 10 pairs of hammers, and an equipment weight of 25 tons.

[0154] (3) adding the scrap aluminum crushed material to the paint removal liquid, performing paint removal treatment on the scrap aluminum crushed material, and then filtering, taking out, and drying to obtain the paint-removed scrap aluminum crushed material; the paint removal liquid comprises the following components by weight:

[0155] 15 parts of hexanol, 3 parts of heptanol, 1 part of benzoic acid, 3 parts of surfactant, 2 parts of cetylpyridinium chloride, 1 part of acetamide, 5 parts of adsorption-modified diatomaceous earth, 5 parts of disodium hydrogen phosphate, and 40 parts of dichloromethane;

[0156] Wherein, the surfactant is stearic acid.

[0157] The preparation method of adsorption modified diatomaceous earth is:

[0158] First, diatomaceous earth was mixed with the surfactant solution, the temperature was adjusted to 80°C, stirred for 40 minutes, then filtered, washed to neutrality, and dried to constant weight;

[0159] The diatomaceous earth treated as above is added into a resistance furnace, subjected to multi-stage heat treatment, and finally cooled to room temperature to obtain adsorption-modified diatomaceous earth.

[0160] The mixing ratio of the diatomaceous earth and the surfactant solution is 14 g: 150 mL;

[0161] The surfactant solution preparation method is as follows:

[0162] Sodium dodecylbenzene sulfonate and water are mixed together, and then stirred at room temperature for 30 minutes to obtain a surfactant solution;

[0163] Wherein, the mass fraction of the surfactant solution is 10%.

[0164] Multi-stage heat treatment is:

[0165] First adjust the temperature to 415°C, then keep it warm for 10 minutes;

[0166] Then adjust the temperature to 520°C and keep warm for 20 minutes;

[0167] Finally, adjust the temperature to 600°C and keep it warm for 40 minutes.

[0168] (4) adding the above-obtained paint-removed scrap aluminum crushed material into a smelting furnace, and subjecting it to smelting treatment to obtain molten scrap aluminum liquid;

[0169] Adjust the melting temperature to 720°C and stir for 30 minutes;

[0170] (5) refining the molten waste aluminum liquid; the refining process is as follows:

[0171] Nitrogen was introduced for 30 min at a flow rate of 1 L / min.

[0172] After the nitrogen is passed through, the scum is removed by filtration to complete the refining process.

[0173] (6) The molten waste aluminum liquid after the refining treatment is poured into the mold; the pouring temperature is 580°C.

[0174] (7) After cooling and shaping, demoulding is performed.

[0175] Comparative Example 1:

[0176] Based on Example 1, no paint removal liquid treatment was performed.

[0177] Comparative Example 2:

[0178] Based on Example 1, no adsorbed modified diatomaceous earth is added to the paint removal liquid.

[0179] An aluminum sheet with a specification of 15 cm × 15 cm × 4 mm was evenly coated with paint (application number: 201710106505.X), wherein the coating area was 15 cm × 15 cm, and then treated with the paint removal liquid in the embodiment and the comparative example, 12 samples in each group, and the average value was taken. The paint area before and after the treatment was compared to obtain the paint removal rate;

[0180] Table 1

[0181] Paint stripping rate% Example 1 99.9 Example 2 100.0 Example 3 99.9 Example 4 99.9 Example 5 99.9 Comparative Example 2 92.5

[0182] It can be seen from Table 1 that after being treated with the paint removal liquid of the present invention, it has an excellent paint removal effect and can significantly remove the paint attached to the surface of waste aluminum and the like.

[0183] Testing The mechanical properties of the scrap aluminum product samples prepared in the above embodiments and comparative examples were tested according to the national standard GB / T228-2002, as shown in Table 2:

[0184] Table 2

[0185] Non-proportional elongation strength MPa Example 1 304 Example 2 310 Example 3 308 Example 4 311 Example 5 303 Comparative Example 1 289 Comparative Example 2 298

[0186] It can be seen from Table 2 that the method of the present invention has a higher strength guarantee for the waste aluminum products obtained after the waste aluminum is treated.

[0187] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for recycling and reprocessing waste aluminum, characterized in that: The following steps are involved: (1) Collecting scrap aluminum materials; (2) adding the waste aluminum material to a crusher for crushing to obtain waste aluminum crushed material; (3) adding the scrap aluminum crushed material to the paint removal liquid, performing paint removal treatment on the scrap aluminum crushed material, and then filtering, taking out, and drying to obtain the paint-removed scrap aluminum crushed material; (4) adding the above-obtained paint-removed scrap aluminum crushed material into a smelting furnace, and subjecting it to smelting treatment to obtain molten scrap aluminum liquid; Adjust the melting temperature to 700-720℃ and stir for 30min; (5) refining the molten waste aluminum liquid; (6) pouring the molten waste aluminum liquid after the refining process into a mold; (7) After cooling and shaping, demoulding is performed.

2. A method for recycling and reprocessing waste aluminum according to claim 1, characterized in that: The waste aluminum material in step (1) includes any one or more of waste aluminum doors and windows, waste aluminum plates, waste aluminum wires, waste aluminum casings, and waste automobile aluminum parts.

3. A method for recycling and reprocessing waste aluminum according to claim 2, characterized in that: In step (2), the waste aluminum material is crushed as follows: The scrap aluminum material is added to the crusher for crushing. The crusher used is a 1600 type metal crusher with a feed size of 1600 mm, a discharge size of 20-50 mm, a production capacity of 20 tons / hour, a motor power of 400 kilowatts, a speed of 750 rpm, 10 pairs of hammers, and an equipment weight of 25 tons.

4. A method for recycling and reprocessing waste aluminum according to claim 3, characterized in that: In step (3), the paint removal liquid is measured by weight Includes the following ingredients: 15 parts of hexanol, 3 parts of heptanol, 1 part of benzoic acid, 2-3 parts of surfactant, 2 parts of cetylpyridinium chloride, 1 part of acetamide, 3-5 parts of adsorption-modified diatomaceous earth, 5 parts of disodium hydrogen phosphate, and 40 parts of dichloromethane; Wherein, the surfactant is stearic acid.

5. The method for recycling and reprocessing waste aluminum according to claim 4, characterized in that: The preparation method of the adsorption modified diatomite is: First, diatomaceous earth was mixed with the surfactant solution, the temperature was adjusted to 80°C, stirred for 40 minutes, then filtered, washed to neutrality, and dried to constant weight; The diatomaceous earth treated as above is added into a resistance furnace, subjected to multi-stage heat treatment, and finally cooled to room temperature to obtain adsorption-modified diatomaceous earth.

6. A method for recycling and reprocessing waste aluminum according to claim 5, characterized in that: The mixing ratio of the diatomaceous earth and the surfactant solution is 12-14 g: 150 mL; The surfactant solution preparation method is as follows: Sodium dodecylbenzene sulfonate and water are mixed together, and then stirred at room temperature for 30 minutes to obtain a surfactant solution; Wherein, the mass fraction of the surfactant solution is 10%.

7. The method for recycling and reprocessing waste aluminum according to claim 5, characterized in that: The multi-stage heat treatment is: First adjust the temperature to 400-415℃, then keep it warm for 10 minutes; Then adjust the temperature to 500-520℃ and keep warm for 20 minutes; Finally, adjust the temperature to 580-600℃ and keep warm for 40 minutes.

8. The method for recycling and reprocessing waste aluminum according to claim 1, characterized in that: The refining process in step (5) is as follows: Nitrogen was introduced for 30 min at a flow rate of 1 L / min. After the nitrogen is passed through, the scum is removed by filtration to complete the refining process.

9. The method for recycling and reprocessing waste aluminum according to claim 1, characterized in that: The pouring temperature in step (6) is 580°C.