CN113549794A - Aluminum alloy tank produced by using waste aluminum alloy tank - Google Patents
Aluminum alloy tank produced by using waste aluminum alloy tank Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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Abstract
The invention provides an aluminum alloy tank produced by using a waste aluminum alloy tank, which belongs to the field of nonferrous metal processing (aluminum alloy processing) and metal packaging. The invention recovers the waste aluminum alloy tank (the material is mainly 3104 alloy), then prepares the same 3104 aluminum alloy, and deeply punches to obtain the aluminum alloy tank, hardly causes the increase of w (Ti) in the whole preparation process, does not worry about the problem of Ti enrichment, shortens the soaking time, avoids the segregation problem of Mn in the 3104 aluminum alloy, effectively ensures the guaranteed recycling of the aluminum alloy for the tank, particularly greatly reduces the cost of the aluminum alloy deep punching tank for large-scale high-density use of the aluminum alloy deep punching tank for ocean transportation, and also meets the problems of low carbon and environmental protection.
Description
Technical Field
The invention belongs to the field of nonferrous metal processing (aluminum alloy processing) and metal packaging, and particularly relates to an aluminum alloy tank produced by utilizing a waste aluminum alloy tank.
Background
3104 the aluminum alloy, belonging to Al-Mn-Mg series, has the characteristics of high strength, high toughness, strong corrosion resistance, good deep drawing formability and the like, and is widely applied to packaging, transportation and production and manufacture of aluminum alloy tank bodies. The plate has lower anisotropy and earing rate and is widely applied to preparing aluminum alloy deep drawing cans.
The aluminum alloy tank needs to be recycled to prepare secondary aluminum, and at present, no scheme for fully using and recycling the tank body material of the waste aluminum alloy tank exists in the domestic and foreign industries. In most of domestic areas and enterprises, the recycled waste aluminum alloy tanks are degraded to be used for low-end products, the recycled aluminum alloy tanks cannot be used for aluminum alloy tank products, new aluminum materials are needed to be used for the aluminum alloy tanks every time, and a large amount of waste is caused. The use of fossil power for producing 1 ton of electrolytic aluminum emits about 11.2 tons of carbon dioxide, and compared with the original aluminum, the secondary aluminum only needs 5 percent of energy and emits 5 percent of greenhouse gas. According to the development and propulsion plan of the recycled nonferrous metal industry, according to the calculation, compared with the original aluminum production, each ton of recycled aluminum is equivalent to 3,443 kg of standard coal for energy conservation, 22 cubic meters of water is saved, and 20 tons of solid waste discharge is reduced. Therefore, the importance of recycling the waste aluminum on the low-carbon and environment-friendly development of the aluminum industry can be seen.
The main reasons why the aluminum alloy can cannot be recycled in a guaranteed level are as follows: 3104 in the production process of aluminum alloy plate, the grain refiner titanium wire must be added, so with the reuse of the waste aluminum alloy can, Ti element will be continuously accumulated and increased with the addition of the grain refiner titanium wire. Finally, Ti element in the aluminum alloy exceeds the standard, and the aluminum alloy can not be used as 3104 aluminum alloy.
Disclosure of Invention
Aiming at the problem that the recycled aluminum which takes the recycled aluminum alloy tank as the raw material can not be recycled and reused as the aluminum alloy tank in the prior art, the invention provides the aluminum alloy tank produced by utilizing the waste aluminum alloy tank.
A method for producing an aluminum alloy tank by using a waste aluminum alloy tank comprises the following steps:
(1) screening the waste aluminum alloy tanks, depainting and baking, and melting into molten aluminum;
(2) casting: transporting the molten aluminum to a smelting furnace, and casting;
(3) refining: comprises refining in a heat preservation furnace and on-line refining;
(4) and (3) filtering: controlling the content of N20 not to exceed 10K/Kg of Al;
(5) casting: adding Al-3Ti-1B grain refiner with the addition of 0.2-0.4Kg/t of Al, the casting speed of 60mm/min and the casting temperature of 690 ℃;
(6) sawing, milling and soaking;
(7) hot rolling and cold rolling;
(8) cutting edge, deep-drawing to obtain can.
Wherein, the melting temperature in the step (1) is 730-780 ℃.
After the casting in the step (2), the content of each element in the aluminum liquid is as follows: si is less than or equal to 0.5 percent, Fe is less than or equal to 0.8 percent, Cu is less than or equal to 0.3 percent, Mn: 0.7-0.9%, Mg: 1.0-1.5%, Ti: 0.02-0.05%, less than or equal to 0.05% of other single impurities, and the balance of Al, wherein the percentage is weight percentage.
Preferably, w (Fe) is more than w (Si), w (Fe) and w (Si) respectively represent the mass fraction of the element in the molten aluminum.
Wherein, in the step (3), the refining medium is argon and chlorine.
Specifically, the refining temperature of the heat preservation furnace is 740-750 ℃; controlling chlorine flow according to argon flow, controlling the proportion of chlorine to be 4% -5%, argon inlet pressure to be 0.60-0.75 MPa, argon outlet pressure to be 0.60-0.75 MPa, and flow: 10.0-14.0 Mm/hr; carrying out dry distillation at a chlorine inlet pressure of 0.30-0.35 MPa, an outlet pressure of 0.30-0.35 MPa and a flow rate of 0.5-0.7 Mm for carrying out dry distillation/hr; the refining time of argon is 40min, and the refining time of the mixed gas of argon and chlorine is 10 min.
Specifically, refining on line at the temperature of 700-730 ℃; argon pressure of 0.65-0.75 MPa, argon flow of 6.5-10.0 Nm/hr; performing the dry-wet method with a chlorine pressure of 0.30.30-0.35 MPa and a chlorine flow of 0.02.02-0.02-0.05 Nm/hr.
In the step (4), MCF tube filtration (A stage) and MCF tube filtration (C stage) are adopted for filtration in two stages, and the temperature of the aluminum liquid is 695-.
Wherein in the step (6), the soaking is two-stage soaking, specifically, after heating at 600 +/-10 ℃ for 3-5h, keeping the temperature at 510 +/-10 ℃ for 1-2 h.
Wherein, in the step (7), the hot rolling comprises hot rough rolling and hot finish rolling, specifically, the hot rough rolling is rough rolling for 17 times, the temperature of the intermediate billet is 450-; then, hot finish rolling is carried out, rolling is carried out by a 4-stand continuous rolling mill, the outlet thickness of the coiled material is 2.0 +/-0.5 mm, and the outlet temperature is 350 +/-20 ℃.
Wherein, in the step (7), the cold rolling is carried out at the rolling speed of 1200m/min, the outlet temperature of 150 ℃ and 160 ℃, and the thickness of 0.26 +/-0.02 mm.
According to the invention, the refining is carried out in the atmosphere of chlorine and argon, so that the effect of removing slag in the metal is improved, and the purity of the metal is ensured. In the casting process, in order to avoid the adverse effect of Ti element and reduce the addition of titanium wires as much as possible under the condition of ensuring crystal grains, Al-3Ti-1B is added as a refiner in the invention, the addition is 0.4kg/t Al, and enough TiB is obtained2Particles and TiAl3While grain refinement is carried out on the particles, only w (Ti) is increased by 0.0012%, the addition of the refiner in a trace amount can not cause Ti increase in the aluminum alloy, and Ti enrichment can not occur during recovery. Meanwhile, in order to reduce the influence of high Si and high Fe on Mn segregation, the heating process adopts highA warm short time process, 600 ℃ for 3 h.
The invention has the beneficial effects
According to the invention, a large amount of waste aluminum alloy tanks are recycled, refining is carried out to remove impurities, Al-3Ti-1B refiner is adopted, soaking heating time is shortened, the regenerated aluminum can be used as the tank body material of the aluminum alloy tanks again, new aluminum alloy plates are not required to be used for preparation, 3104 aluminum alloy is recycled in a guaranteed manner, low carbon and environmental protection are realized, and cost is greatly saved.
Drawings
FIG. 1 shows the grain size and slag inclusion detection, PODFA slag detection, of 3104 alloy produced in example 1;
FIG. 2 shows the grain size and slag inclusion detection, PODFA slag detection, of 3104 alloy produced in comparative example 1.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
The alloy state of the 3104 aluminum alloy tank material is as follows: 3104/H19, finished thickness: 0.26mm, and the production process comprises the following steps: screening of waste aluminum alloy cans → depainting and baking → melting → smelting → refining → filtering → casting → sawing and milling → heating → hot rough rolling → hot finish rolling → cold rolling three tandem rolling → edge cutting and oiling → deep drawing to form the cans.
1) Screening: the packaging block of the aluminum alloy scrap tank recovered by the society is crushed, and soil, plastics and other foreign matters in the waste are removed through gravity separation and selection by a conveyor belt.
2) Paint removal and baking: and (3) feeding the screened waste aluminum alloy cans into a rotary kiln, setting the temperature at 500 ℃, baking for 30min, wherein the baking is carried out for 20min, and the rotation is carried out for 10 min.
3) Melting: and (3) enabling the baked and depainted waste tank to enter a melting chamber in a double-chamber furnace, melting the waste aluminum alloy tank by using aluminum water in the melting furnace, fully melting the waste aluminum alloy tank by heating through natural gas, and controlling the temperature of molten aluminum to be 730-780 ℃.
4) Casting: transporting molten aluminum melted by the double-chamber furnace to a smelting furnace by using an aluminum water ladle, wherein the aluminum water ladle comprises the following chemical components: si: 0.25%, Fe: 0.51%, Cu: 0.21%, Mn: 0.8%, Mg: 1.28%, Ti: 0.026%, less than or equal to 0.05% of other single impurities and the balance of Al, wherein the smelting temperature is 750-760 ℃.
5) Refining: the refining comprises refining in a heat preservation furnace and online refining. Wherein the refining temperature of the holding furnace is 740-750 ℃, the refining process parameters of HD2000 equipment and the HD2000 rotating speed are set to be 280 r/min. Refining medium argon and chlorine, controlling the chlorine flow according to the argon flow, controlling the chlorine proportion to be 4% -5%, controlling the argon inlet pressure to be 0.60-0.75 MPa, controlling the outlet pressure to be 0.60-0.75 MPa, and controlling the flow: 10.0-14.0 Mm/hr; chlorine inlet pressure is 0.30-0.35 MPa, outlet pressure is 0.30-0.35 MPa, and flow rate is 0.5-0.7 Mm for carrying out the high-speed high-. The refining time of argon is 40min, and the refining time of the mixed gas of argon and chlorine is 10 min. The on-line refining equipment is an SNIF refining box and adopts double rotors for refining. The process comprises the following steps: the temperature is 700-730 ℃; the degassing medium is argon and chlorine; argon pressure of 0.65-0.75 MPa, argon flow of 6.5-10.0 Nm/hr; carrying out the dry distillation under the conditions that the chlorine pressure is 0.30-0.35 MPa and the chlorine flow rate is 0.02-0.05 Nm/hr; using an inlet single rotor to blow chlorine; the speed of the SNIF rotor is 500-600 r/min, and the chlorine accounts for 0.2-0.6%.
6) And (3) filtering: and filtering by adopting an MCF tube (A stage) and an MCF tube (C stage) in two stages, wherein the temperature of the aluminum liquid is 695-710 ℃, and the throughput of the aluminum liquid is less than 3000 tons. And on-line measuring slag by using LIMCA to monitor the slag inclusion amount of the aluminum liquid, and controlling the content of N20 not to exceed 10K/Kg Al.
7) Casting: adding an Al-3Ti-1B grain refiner, wherein the addition amount of the Al is 0.4Kg/t, the casting speed is 60mm/min, the casting temperature is 690 ℃, and the water temperature is 20-30 ℃.
8) Sawing and milling: the dummy bar head saws 250mm and the large face mills 10 mm.
9) Heating: heating at 600 deg.C for 3h, and keeping at 510 deg.C for 1 h.
10) Hot rough rolling: the speed of the rough rolling is 1m/min for 17 passes, the speed of the last two passes is 475 ℃, and the thickness of the intermediate billet is 30 mm.
11) Hot finish rolling: rolling with 4-stand continuous mill, the outlet thickness of coiled material is 2.0mm, and the outlet temperature is 350 ℃.
12) Cold rolling and triple tandem rolling: the inlet of the triple tandem mill is 2.0mm, the outlet is 0.26mm, and the total processing rate is 87%. Cold continuous rolling speed: 1200m/min, cold rolling exit temperature 152 ℃.
13) The edge trimmer: the speed is 1100m/min, and the surface oil coating quantity is 250 mg/square meter.
The residue was measured by LIMCA, and N20 was 1.3K/Kg Al.
The grain size of the 3104 alloy can body slab ingot produced by the examples is shown in table 1.
Table 1 example slab grain size for production of 3104 alloy can body stock
The carbon emissions of the 3104 alloy can body material produced using the examples are shown in table 2.
TABLE 2 carbon emissions for the production of 3104 alloy can body material from the examples
The final properties of the 3104 alloy can body material produced using the examples are shown in table 3.
TABLE 3 tensile Properties of finished 3104 alloy can body stock produced in the example
Comparative example 1
The alloy state of the 3104 aluminum alloy can body material of this example is as follows: 3104/H19, finished thickness: 0.26mm, and the production process comprises the following steps: smelting → refining → filtering → casting → sawing and milling → heating → hot rough rolling → hot finish rolling → cold rolling three tandem rolling → edge cutting oiling → deep drawing to form the can.
1) Casting: raw aluminum water and aluminum ingots are used, and the chemical composition is as follows: 0.20% of Si, Fe: 0.40%, Cu: 0.20%, Mn: 0.9%, Mg: 1.2%, Ti: 0.015 percent, less than or equal to 0.03 percent of other single impurities and the balance of Al, wherein the smelting temperature is 750-760 ℃.
2) Refining: the same as the experimental example.
3) And (3) filtering: CFF (50 PPI) filtration and MCF tube filtration (C-level) double-stage filtration are adopted, the temperature of aluminum liquid is 695-710 ℃, and the throughput of the aluminum liquid is less than 3000 tons.
4) Casting: adding Al-5Ti-0.2B grain refiner with the addition of 1.2Kg/t of Al, wherein the casting speed is 60mm/min, the casting temperature is 690 ℃, and the water temperature is 20-30 ℃.
5) Sawing and milling: the same as the experimental example.
6) Heating: heating at 600 deg.C for 8h, and keeping at 510 deg.C for 1 h.
7) Hot rough rolling: rough rolling is carried out for 17 times, the temperature of the intermediate billet is 475 ℃, and the thickness of the intermediate billet is 30 mm.
8) Hot finish rolling: rolling with 4-stand continuous mill, the outlet thickness of coiled material is 2.2mm, and the outlet temperature is 340 ℃.
9) Cold rolling and triple tandem rolling: the inlet of the triple tandem mill is 2.2mm, the outlet is 0.26mm, and the total processing rate is 88 percent. Cold continuous rolling speed: 1000m/min, cold rolling outlet temperature 130 ℃.
10) The edge trimmer: the same as the experimental example.
The grain size and slag inclusion of the 3104 alloy can body material produced in the comparative example were examined and shown in the following figure.
The residue was measured by LIMCA, and N20 was 0.9K/Kg Al.
The grain size of the 3104 alloy can body slab ingot produced by the examples is shown in table 4.
TABLE 4 example slab grain size for production of 3104 alloy can body stock
The carbon emissions of the 3104 alloy can body material produced using the comparative example are shown in table 5.
TABLE 5 carbon emissions for the production of 3104 alloy can body material from the examples
The final properties of the 3104 alloy can body material produced using the comparative example are shown in table 6.
TABLE 6 tensile Properties of the finished 3104 alloy can body stock produced in the examples
As can be seen from tables 1, 3,4 and 6, the grain size, yield strength, elongation and earing rate of the secondary aluminum provided by the invention reach the level of the primary aluminum, which indicates that the secondary aluminum and the primary aluminum provided by the invention can be used as deep-drawing tank raw materials, so that the secondary aluminum material is recycled in a guaranteed level, and tables 2 and 5 indicate that the carbon emission in the production process of the secondary aluminum is obviously less than that of the primary aluminum, so that the requirements of energy conservation and emission reduction are met.
Claims (10)
1. An aluminum alloy tank produced by using a waste aluminum alloy tank is characterized in that the preparation method comprises the following steps:
(1) screening the waste aluminum alloy tanks, depainting and baking, and melting into molten aluminum;
(2) casting: transporting the molten aluminum to a smelting furnace, and casting;
(3) refining: comprises refining in a heat preservation furnace and on-line refining;
(4) and (3) filtering: controlling the content of N20 not to exceed 10K/Kg of Al;
(5) casting: adding Al-3Ti-1B grain refiner with the addition of 0.2-0.4Kg/t of Al, the casting speed of 60mm/min and the casting temperature of 690 ℃;
(6) sawing, milling and soaking;
(7) hot rolling and cold rolling;
(8) cutting edge, deep-drawing to obtain can.
2. The aluminum alloy can as claimed in claim 1, wherein the melting temperature in step (1) is 730-.
3. The aluminum alloy tank as recited in claim 1, wherein after the casting in the step (2), the content of each element in the molten aluminum is as follows: si is less than or equal to 0.5 percent, Fe is less than or equal to 0.8 percent, Cu is less than or equal to 0.3 percent, Mn: 0.7-0.9%, Mg: 1.0-1.5%, Ti: 0.02-0.05%, less than or equal to 0.05% of other single impurities, and the balance of Al, wherein the percentage is weight percentage.
4. An aluminium alloy can according to claim 3, wherein in the aluminium bath w (Fe) is greater than w (Si).
5. The aluminum alloy can of claim 1, wherein in step (3), the refining medium is argon and chlorine.
6. The aluminum alloy tank as recited in claim 5, wherein the holding furnace refining temperature is 740 to 750 ℃; controlling chlorine flow according to argon flow, controlling the proportion of chlorine to be 4% -5%, argon inlet pressure to be 0.60-0.75 MPa, argon outlet pressure to be 0.60-0.75 MPa, and flow: 10.0-14.0 Mm/hr; carrying out dry distillation at a chlorine inlet pressure of 0.30-0.35 MPa, an outlet pressure of 0.30-0.35 MPa and a flow rate of 0.5-0.7 Mm for carrying out dry distillation/hr; the refining time of argon is 40min, and the refining time of the mixed gas of argon and chlorine is 10 min.
7. The aluminum alloy can of claim 5, wherein the method of claim 1, wherein the on-line refining is performed at a temperature of 700 ℃ to 730 ℃; argon pressure of 0.65-0.75 MPa, argon flow of 6.5-10.0 Nm/hr; performing the dry-wet method with a chlorine pressure of 0.30.30-0.35 MPa and a chlorine flow of 0.02.02-0.02-0.05 Nm/hr.
8. The aluminum alloy tank as recited in claim 1, wherein in the step (4), the filtration is performed by using a class A MCF tube filtration and a class C MCF tube two-stage filtration, and the temperature of the aluminum liquid is 695-plus 710 ℃.
9. The aluminum alloy can of claim 1, wherein in step (6), the soaking is a two-stage soaking, specifically, after heating at 600 ± 10 ℃ for 3-5h, the temperature is maintained at 510 ± 10 ℃ for 1-2 h.
10. The aluminum alloy can as claimed in claim 1, wherein in the step (7), the hot rolling comprises hot rough rolling and hot finish rolling, specifically, the hot rough rolling comprises 17 rough rolling passes, the temperature of the intermediate billet is 450 ℃ and 500 ℃, and the thickness of the intermediate billet is 30 +/-3 mm; then, carrying out hot finish rolling, and rolling by a 4-stand continuous rolling mill, wherein the outlet thickness of a coiled material is 2.0 +/-0.5 mm, and the outlet temperature is 350 +/-20 ℃; the cold rolling is carried out at the rolling speed of 1200m/min, the outlet temperature of 150 ℃ and 160 ℃, and the thickness of 0.26 +/-0.02 mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114131296A (en) * | 2021-12-06 | 2022-03-04 | 惠州深赛尔化工有限公司 | Processing technology of high-strength corrosion-resistant industrial product storage tank |
| CN115216664A (en) * | 2022-07-27 | 2022-10-21 | 山东南山铝业股份有限公司 | Production method of circulation grade-keeping 3-series tank material |
| CN115287492A (en) * | 2022-08-09 | 2022-11-04 | 山东南山铝业股份有限公司 | Production method of circulation grade-keeping 5-series low-strength tank cover material |
| WO2023202588A1 (en) * | 2022-04-19 | 2023-10-26 | 宝山钢铁股份有限公司 | Aluminum alloy plate for tank and manufacturing method therefor |
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| WO2023202588A1 (en) * | 2022-04-19 | 2023-10-26 | 宝山钢铁股份有限公司 | Aluminum alloy plate for tank and manufacturing method therefor |
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