Pr-modified recycled aluminum anode material for alkaline air battery and preparation method thereof

Abstract

The application provides a pr-modified recycled aluminum alkaline air battery anode material and a preparation method thereof, and belongs to the technical field of aluminum alloy materials.The anode material is composed of the following components in percentage by weight: 0.1-2.0% of Zn, 0.01-0.2% of Ga, 0.01-0.3% of Pr, 0.2-2% of Mn, 0.9-2.0% of Fe, and 0.5-2.0% of Si; the balance is Al; the Si and Fe are from recycled aluminum.The application directly uses high-iron recycled aluminum to prepare the pr-Ga-Mn-Si-Zn five-element alloy by reducing the raw material cost by more than 80%; the application avoids the resource waste of the traditional dilution method, realizes the high-value utilization of recycled aluminum, and forms a closed loop of "waste aluminum-anode-corrosion product-aluminum source", thereby avoiding the aluminum circulation imbalance and the secondary aluminum surplus problem caused by the accumulation of alloy elements.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of aluminum alloy materials, in particular to a praseodymium modified recycled aluminum alkaline air cell anode material and a preparation method thereof. BACKGROUND

[0002] With the depletion of fossil energy and the aggravation of environmental pollution, recycled aluminum has become a green aluminum source due to its low energy consumption (only 5% of that of primary aluminum), but the accumulation of alloy elements (such as Fe and Si) during the recycling process makes it difficult to be used in high-end fields. At present, it is mainly produced into low-value casting alloys through dilution method, which needs additional refining, resulting in increased cost, unbalanced aluminum recycling and excess of secondary aluminum. Therefore, more efficient utilization and upgrading are urgently needed. Aluminum-air batteries are attracting attention due to their high energy density and low cost potential, but they generally use high-purity aluminum (>99.99wt%) to prepare anode materials, which limits their commercial application process.

[0003] The most core problem of applying recycled aluminum alloy in aluminum-air batteries is to solve the problem of serious self-corrosion caused by high content of Fe impurities and the positive shift of anode potential and the reduction of utilization efficiency. Therefore, the core goal of the application is to solve the following key technical problems: (1) inhibiting the harmful effect of iron-rich phase; (2) regulating the anode electrochemical behavior to break through the limitation of Fe≤0.2% in recycled aluminum and realize the high-value utilization of recycled aluminum with Fe content of 0.9-2.0%. SUMMARY

[0004] The application provides a praseodymium modified recycled aluminum alkaline air cell anode material and a preparation method thereof aiming at the problems caused by iron content impurities in the existing aluminum-air batteries.

[0005] The praseodymium modified recycled aluminum alkaline air cell anode material is composed of the following components in percentage by weight: 0.1-2.0% of Zn, 0.01-0.2% of Ga, 0.01-0.3% of Pr, 0.2-2% of Mn, 0.9-2.0% of Fe, 0.5-2.0% of Si, and the balance of aluminum, wherein the Fe and Si are from recycled aluminum.

[0006] Preferably, the ratio of the content of Mn to the content of Fe is ≤1.3:1.

[0007] Preferably, the ratio of the content of Si to the content of Fe is ≤1:1.

[0008] The preparation method of the pr-modified recycled aluminum alkaline air battery anode material has the characteristics that it comprises the following steps: Step 1, proportioning and batching, taking recycled aluminum, pure Zn, pure Ga, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy according to proportions; Step 2, placing the recycled aluminum into a crucible, heating to 730-760 DEG C, and skimming slag; Step 3, wrapping the pure Zn, pure Ga, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy with aluminum foil respectively, and pressing them into the aluminum melt below the liquid level with a tool, the pressing sequence being aluminum-manganese intermediate alloy, aluminum-pr intermediate alloy, pure Zn and pure Ga in turn, and the interval between each time of adding being 2-3 min, and keeping slight stirring of the aluminum melt for 5-8 min after pressing to make the alloy elements uniformly dispersed and accelerate dissolution, so as to form an aluminum melt with uniform composition; Step 4, pressing the aluminum foil wrapped with the refining agent into the bottom of the aluminum melt, and skimming slag after standing for 10-15 min; Step 5, pouring the aluminum melt into a preheated metal mold, and taking out the ingot after cooling and demolding, so as to obtain the alkaline air battery anode material.

[0009] Preferably, in the step four, the refining agent is a mixture of NaCl and KCl configured according to a weight ratio of 1:1, and the amount of the refining agent is 0.3%-0.4% of the total weight of the aluminum melt.

[0010] Preferably, the aluminum-pr intermediate alloy is Al-14Pr.

[0011] Preferably, the aluminum-manganese intermediate alloy is Al-20Mn.

[0012] Preferably, the preparation process of the pr-modified recycled aluminum alkaline air battery anode material is carried out under argon protection.

[0013] The beneficial effects of the present application are as follows: (1) The present application directly uses high-iron recycled aluminum as raw material, and the iron content in the recycled aluminum can be as high as 2%, without the need for refining to reduce the iron content, so that the raw material cost is reduced by more than 80%; the resource waste of the traditional dilution method is avoided, and the high-value utilization of recycled aluminum is realized. (2) In the aluminum air anode battery material of the present application, the corrosion product is Al (OH) 3, which can be directly used for the production of aluminum oxide, forming a closed loop of "waste aluminum-anode-corrosion product-aluminum source", and avoiding the problems of aluminum cycle imbalance and secondary aluminum surplus caused by the accumulation of alloy elements. (3) The present application applies low-cost recycled aluminum alloy as the aluminum air battery anode material, and adds Pr to maintain the minimum free energy and reduce the occurrence of lattice distortion, only a small amount of Pr is solid-solved in alpha-Al, and the rest is mostly enriched at the grain boundary and forms Al 11Pr3 rare earth compound, this characteristic makes Pr has the potential of refining grain and improving the dispersion of the second phase, the solubility of rare earth Pr in aluminum, iron, silicon is small, the interaction between each other generates multi-element complex intermetallic compound, also can make the distribution of Si, Fe and other elements more uniform, a certain content of Pr can also reduce the segregation phase, improve the corrosion resistance. In addition, the standard hydrogen potential of Pr is-2.44V vs. SHE, and the dispersion distribution can promote the uniform corrosion of aluminum anode, and the introduction of Pr can make the aluminum alloy anode more active, thereby improving the electrochemical performance in the aluminum-air battery. (4) Ga is introduced in the application, Ga will first dissolve into the electrolyte, then adhere to the surface of the aluminum anode, destroy the surface oxide film, thereby enhancing the anode activity, and when the gallium reaches 0.2%, the aluminum anode has the largest negative potential. (5) By adding Zn, the self-corrosion of the regenerated aluminum anode can be effectively reduced; (6) Si is a common impurity in recycled aluminum, which can reduce the corrosion of the alloy under load conditions, eliminate the harmful effects of part of the impurity Fe element, and the presence of Si improves the discharge potential. (7) The addition of Mn can improve the iron-rich phase and promote the formation of α-Al8(Fe,Mn)2Si and α-Al 15 (Fe,Mn)3Si2 to balance the potential. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The anode open circuit voltage and discharge curve at 80mA / cm 2 current density of the praseodymium modified recycled aluminum alkaline air battery anode material obtained in example one and example two, wherein: (a) anode material open circuit voltage; (b) discharge curve at 80mA / cm 2 current density.

[0015] Figure 2 The morphology of the iron-rich phase of recycled aluminum before Pr modification.

[0016] Figure 3 The morphology of the iron-rich phase in the praseodymium modified recycled aluminum alkaline air battery anode material obtained in example one.

[0017] Figure 4 The full cell group test device diagram of example one to example five.

[0018] Figure 5 The full cell test schematic diagram of example one to example five. DETAILED DESCRIPTION

[0019] The specific embodiments of the application will be described in detail below with reference to the accompanying drawings of the specification, but it should be understood that the protection scope of the application is not limited by the specific embodiments.

[0020] Example one

[0021] A pr-modified recycled aluminum alkaline air battery anode material, which is composed of the following components in percentage by weight: 1.0% of Zn, 0.2% of Ga, 0.1% of Pr, 0.2% of Mn, 1.0% of Fe, 1.0% of Si, and the balance of aluminum; the Fe and Si are from recycled aluminum.

[0022] The preparation method of the pr-modified recycled aluminum alkaline air battery anode material comprises the following steps: Step one, proportioning, taking recycled aluminum, pure Zn, pure Ga, aluminum-silicon intermediate alloy, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy; Step two, placing the recycled aluminum into a crucible, heating to 740 DEG C, and skimming; Step three, pressing in the aluminum-manganese intermediate alloy, the aluminum-pr intermediate alloy, pure Zn and pure Ga in sequence, with an interval of 3 min each time, and keeping the aluminum melt slightly stirred for 5 min after pressing in, so that the alloy elements are uniformly dispersed and the dissolution is accelerated, forming an aluminum melt with uniform composition; Step four, pressing the aluminum foil wrapped with a refining agent into the bottom of the aluminum melt, and skimming after standing for 15 min; Step five, preheating a Φ40*80 mm metal mold to 200 DEG C, then introducing the aluminum melt into the metal mold, and taking out the ingot after cooling and demolding, thereby obtaining the alkaline air battery anode material. The preparation process of the pr-modified recycled aluminum alkaline air battery anode material is carried out under argon protection.

[0023] In step four, the refining agent is a mixture of NaCl and KCl in a weight ratio of 1:1, and the amount of the refining agent is 0.3% of the total weight of the aluminum melt. The aluminum-pr intermediate alloy is Al-14Pr; and the aluminum-manganese intermediate alloy is Al-20Mn.

[0024] Example two

[0025] A pr-modified recycled aluminum alkaline air battery anode material, which is composed of the following components in percentage by weight: 2.0% of Zn, 0.2% of Ga, 0.3% of Pr, 2.0% of Mn, 1.3% of Fe, 1.0% of Si, and the balance of Al, the Fe and Si being from recycled aluminum.

[0026] The preparation method of the pr-modified recycled aluminum alkaline air battery anode material includes the following steps: step one, proportioning, taking recycled aluminum, pure Zn, pure Ga, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy; step two, placing the recycled aluminum into a crucible, heating to 760 DEG C, and skimming; step three, wrapping the pure zinc, pure gallium, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy with aluminum foil, and pressing them into the aluminum melt below the liquid level with a tool, the pressing order being aluminum-manganese intermediate alloy, aluminum-pr intermediate alloy, pure zinc and pure gallium, with an interval of 2 minutes each time, and keeping the aluminum melt slightly stirred for 6 minutes after pressing to make the alloy elements uniformly dispersed and accelerate dissolution, forming an aluminum melt with uniform composition; step four, pressing the aluminum foil wrapped with the refining agent into the bottom of the aluminum melt, and skimming after standing for 10 minutes; step five, preheating a Φ40*80mm metal mold to 200 DEG C, then guiding the aluminum melt into the metal mold, and taking out the ingot after cooling and demolding, thereby obtaining the alkaline air battery anode material.

[0027] In step four, the refining agent is a mixture of NaCl and KCl in a weight ratio of 1:1, and the amount of the refining agent is 0.35% of the total weight of the aluminum melt. The aluminum-pr intermediate alloy is Al-14Pr, and the aluminum-manganese intermediate alloy is Al-20Mn.

[0028] Example three

[0029] A pr-modified recycled aluminum alkaline air battery anode material, which is composed of the following components in weight percentage: 0.1% of Zn, 0.01% of Ga, 0.01% of Pr, 0.8% of Mn, 0.9% of Fe, 0.5% of Si, and the balance of Al; the Fe and Si are from recycled aluminum.

[0030] The preparation method of the pr-modified recycled aluminum alkaline air battery anode material includes the following steps: step one, proportioning, taking recycled aluminum, pure Zn, pure Ga, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy; step two, placing the recycled aluminum into a crucible, heating to 760 DEG C, and skimming; step three, wrapping the pure zinc, pure gallium, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy with aluminum foil, and pressing them into the aluminum melt below the liquid level with a tool, the pressing order being aluminum-manganese intermediate alloy, aluminum-pr intermediate alloy, pure zinc and pure gallium, with an interval of 2 minutes each time, and keeping the aluminum melt slightly stirred for 6 minutes after pressing to make the alloy elements uniformly dispersed and accelerate dissolution, forming an aluminum melt with uniform composition; step four, pressing the aluminum foil wrapped with the refining agent into the bottom of the aluminum melt, and skimming after standing for 10 minutes; step five, preheating a Φ40*80mm metal mold to 200 DEG C, then guiding the aluminum melt into the metal mold, and taking out the ingot after cooling and demolding, thereby obtaining the alkaline air battery anode material.

[0031] The refining agent in the step four is a mixture of NaCl and KCl with a weight ratio of 1:1, and the amount of the refining agent is 0.4% of the total weight of the aluminum melt. The aluminum praseodymium intermediate alloy is Al-14Pr; and the aluminum manganese intermediate alloy is Al-20Mn.

[0032] Example Four

[0033] A praseodymium modified recycled aluminum alkaline air battery anode material, which is composed of the following components in percentage by weight: 0.8% of Zn, 0.1% of Ga, 0.2% of Pr, 0.5% of Mn, 2.0% of Fe, 2.0% of Si, and the balance of Al; the Fe and Si are from recycled aluminum.

[0034] The preparation method of the praseodymium modified recycled aluminum alkaline air battery anode material includes the following steps: Step one, proportioning, weighing recycled aluminum, pure Zn, pure Ga, aluminum manganese intermediate alloy and aluminum praseodymium intermediate alloy; Step two, placing the recycled aluminum into a crucible, heating to 740℃, and skimming the slag; Step three, wrapping the pure Zn, pure Ga, aluminum manganese intermediate alloy and aluminum praseodymium intermediate alloy with aluminum foil, and pressing them into the aluminum melt below the liquid surface with a tool, the pressing order is aluminum manganese intermediate alloy, aluminum praseodymium intermediate alloy, pure Zn and pure Ga, each time adding interval of 3 min, after pressing, keeping the aluminum melt slightly stirring for 8 min, so that the alloy elements are uniformly dispersed and the dissolution is accelerated, forming an aluminum melt with uniform composition; Step four, pressing the aluminum foil wrapped with refining agent into the bottom of the aluminum melt, and skimming the slag after 15 min; Step five, preheating the Φ40*80mm metal mold to 200℃, then pouring the aluminum melt into the metal mold, and taking out the ingot after cooling, thereby obtaining the alkaline air battery anode material.

[0035] The refining agent in the step four is a mixture of NaCl and KCl with a weight ratio of 1:1, and the amount of the refining agent is 0.4% of the total weight of the aluminum melt. The aluminum praseodymium intermediate alloy is Al-14Pr; and the aluminum manganese intermediate alloy is Al-20Mn.

[0036] Example Five

[0037] A praseodymium modified recycled aluminum alkaline air battery anode material, which is composed of the following components in percentage by weight: 1.5% of Zn, 0.15% of Ga, 0.15% of Pr, 1.3% of Mn, 1.0% of Fe, 1.5% of Si, and the balance of Al; the Fe and Si are from recycled aluminum.

[0038] The preparation method of the pr-modified recycled aluminum alkaline air battery anode material described above comprises the following steps: Step 1, proportioning, taking recycled aluminum, pure Zn, pure Ga, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy; Step 2, placing the recycled aluminum into a crucible, heating to 730 DEG C, and skimming the slag; Step 3, wrapping the pure zinc, pure gallium, aluminum-manganese intermediate alloy and aluminum-pr intermediate alloy with aluminum foil, and pressing them into the aluminum melt below the liquid level with a tool, the pressing order being aluminum-manganese intermediate alloy, aluminum-pr intermediate alloy, pure zinc and pure gallium, with an interval of 2 minutes each time, and maintaining slight stirring of the aluminum melt for 8 minutes after pressing to make the alloy elements uniformly dispersed and accelerate dissolution, forming an aluminum melt with uniform composition; Step 4, pressing the aluminum foil wrapped with the refining agent into the bottom of the aluminum melt, and skimming the slag after standing for 15 minutes; Step 5, preheating a Φ40*80mm metal mold to 200 DEG C, then introducing the aluminum melt into the metal mold, and taking out the ingot after cooling and demolding, thereby obtaining the alkaline air battery anode material.

[0039] In step 4, the refining agent is a mixture of NaCl and KCl in a weight ratio of 1:1, and the amount of the refining agent is 0.3% of the total weight of the aluminum melt. The aluminum-pr intermediate alloy is Al-14Pr; and the aluminum-manganese intermediate alloy is Al-20Mn.

[0040] The content of each component in Examples 1-5 is shown in Table 1. The pr-modified recycled aluminum alkaline air battery anode material obtained in Examples 1-5 was cut into a thickness of 1mm for performance testing. The electrochemical test used a three-electrode system and was performed using a Gamry Interface 1010E electrochemical workstation. Hg / HgO was used as the reference electrode, a Pt sheet was used as the auxiliary electrode, and 4 M NaOH was used as the electrolyte. The working area of the Φ14*5mm sample was 1cm², which was polished with 320-2000 mesh sandpaper and immersed for 1h until the open circuit voltage was stable. The open circuit voltage test lasted for 1200s, the EIS test frequency range was 10 -2 -10 5 Hz (perturbation signal 10 mV), and the Tafel curve scanning range was open circuit voltage ±0.4 V (scanning rate 1 mV / s). The EIS data was analyzed by ZSimpWin software. The full cell test was performed on the same workstation, using the alkaline air battery anode material (80*10*3mm, effective area 12cm 2 ) obtained in Examples 1-5 as the anode, and a self-made nickel mesh / waterproof layer / manganese dioxide-activated carbon composite catalytic layer as the cathode. A 4 M NaOH electrolyte was used, and the solution concentration and temperature were maintained constant by a peristaltic pump. The test device is shown in Figure 4 , and the full cell test schematic is shown in Figure 5The test results are shown in Table 2 and Table 3. The anode open circuit voltage and discharge curve at 80 mA / cm 2 of the praseodymium modified recycled aluminum alkaline air battery anode material of Example One and Example Two are shown in Figure 1 .

[0041] The metallographic structure of the iron-rich phase of the recycled aluminum alloy is shown in Figure 2 . The second phase is mainly β-Fe (Al6Fe and Al5FeSi), which is obviously long needle-shaped and forms a coarse and uneven network structure, and its standard potential is -0.39 V vs. SHE, which has a large potential difference with the matrix (-1.66 V vs. SHE), causing galvanic corrosion and exacerbating the self-corrosion reaction, which seriously affects the aluminum anode potential and utilization efficiency. After the introduction of Pr element, the β-Fe phase is transformed into α-Al8Fe2Si phase with smaller potential difference and more compact structure (-1.15 V vs. SHE), and the metallographic structure of the praseodymium modified recycled aluminum air battery anode material obtained in Example One is shown in Figure 3 . The addition of Pr reduces the potential difference and reduces the degree of self-corrosion, and the white block and rod-shaped rare earth phases (Al 11 Pr3) are precipitated around the second phase. Al 11 Pr3 acts as a heterogeneous nucleation core of α-Al, improves the nucleation rate and inhibits grain growth, and Pr is adsorbed around the iron-rich phase to limit Fe / Al diffusion, which promotes the refinement of needle-shaped iron phase into short strips or blocks. Polarized light microscopic analysis shows that the grain diameter of the recycled aluminum alloy is 1428.86 μm, and the alloy grain is reduced to 602.75 μm after the addition of Pr, which is reduced by one time, which is due to the composition supercooling caused by the enrichment of Pr at the solid-liquid interface, and the undissolved Al 11 Pr3 strengthening phase is dispersedly distributed, providing heterogeneous nucleation sites, and effectively refining the grain size.

[0042] The electrochemical test of the praseodymium modified recycled aluminum air battery anode material obtained in Example One-Example Five shows that Pr makes the corrosion current density lowest to 1.73 mA / cm 2 , the size of the iron-rich phase is refined, the corrosion primary cell formed between the cathode phase and the anode phase will be relatively small, and the micro-current that can be tolerated is also less, and the refinement of the cathode phase is the main reason for the reduction of the corrosion current density i corr . The open circuit voltage of the alkaline air battery anode material prepared by the recycled aluminum without Pr modification is 1.24 V, and the open circuit voltage of the alkaline air battery anode material obtained in Example One-Example Five is improved, and the open circuit voltages of Example One, Example Two and Example Five are 1.44 V, 1.51 V and 1.41 V respectively, which is close to the potential of 3N aluminum, and has good activity.

[0043] Table 1 Chemical composition (wt %) of the recycled aluminum base air cell anode material modified with cerium

[0044] Al alloy Fe Ga Zn Si Mn Pr Al Example One 1 0.2 1 1 0.2 0.1 Balance Example Two 1.3 0.2 2 1 2 0.3 Balance Example Three 0.9 0.01 0.1 0.5 0.8 0.01 Balance Example Four 2 0.1 0.8 2 0.5 0.2 Balance Example Five 1 0.15 1.5 1.5 1.3 0.15 Balance

[0045] Table 2 Discharge performance of the recycled aluminum base air cell anode material prepared in Example One to Example Five at a current density of 80 mA.cm -2

[0046] Anode material Current density (mA.cm -2 ) Open circuit voltage (V) Time (S) Average discharge voltage (V) Efficiency (%) Volume density (mAh.g -1 ) Energy density (mWh-g -1 ) Example One 80 1.44 10800 1.27 71.3 2199.145 2792.914 Example Two 80 1.51 10800 1.14 84.3 2598.99 2832.717 Example Three 80 1.39 10800 1.24 71.23 2117.65 2625.88 Example Four 80 1.26 10800 0.83 53.82 1600.00 1328.00 Example Five 80 1.41 10800 1.23 62.91 1870.13 2300.26

[0047] Table 3 Electrochemical test parameters of the recycled aluminum base air cell anode material prepared in Example One to Example Five

[0048] Anode material Corrosion voltage (V vs. Hg / HgO) Corrosion current density / (10 -2 A . cm -2 )]]> Example One -1.44 2.43 Example Two -1.51 1.73 Example Three -1.39 10.25 Example Four -1.26 18.21 Example Five -1.41 6.72 ​

Claims

1. A praseodymium-modified regenerated aluminum alkaline air battery anode material, characterized in that: The anode material consists of the following components in weight percentage: 0.1-2.0% Zn, 0.01-0.2% Ga, 0.01-0.3% Pr, 0.2-2% Mn, 0.9-2.0% Fe, 0.5-2.0% Si, and the balance is aluminum, wherein the Fe and Si come from recycled aluminum.

2. The praseodymium-modified regenerated aluminum alkaline air battery anode material according to claim 1, wherein: The ratio of the Mn content to the Fe content is ≤1.3:

1.

3. The praseodymium-modified regenerated aluminum alkaline air battery anode material according to claim 1, wherein: The ratio of Si content to Fe content is ≤1:

1.

4. The method for preparing a praseodymium-modified regenerated aluminum alkaline air battery anode material according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: step 1, preparing ingredients in proportion and weighing recycled aluminum, pure Zn, pure Ga, aluminum-manganese master alloy and aluminum-praseodymium master alloy; step 2, placing the recycled aluminum in a crucible, heating to 730-760° C., and skimming off the slag; step 3, wrapping pure zinc, pure gallium, aluminum-manganese master alloy and aluminum-praseodymium master alloy with aluminum foil respectively, and pressing them into the aluminum melt below the liquid surface using a tool, in the order of pressing in the aluminum-manganese master alloy, aluminum-praseodymium master alloy, pure zinc and pure gallium, with an interval of 2-3 minutes between each addition, and gently stirring the aluminum melt for 5-8 minutes after pressing in to uniformly disperse the alloy elements and accelerate their dissolution, thereby forming an aluminum melt with uniform composition; step 4, pressing the aluminum foil wrapped with a refining agent into the bottom of the aluminum melt, letting it stand for 10-15 minutes, and then skimming off the slag; step 5, casting the aluminum melt into a preheated metal mold, and separating the mold after cooling to remove the ingot, thereby obtaining an alkaline air battery anode material.

5. The method for preparing a praseodymium-modified regenerated aluminum alkaline air battery anode material according to claim 4, characterized in that: In the step 4, the refining agent is a mixture of NaCl and KCl in a weight ratio of 1:1, and the amount of the refining agent is 0.3%-0.4% of the total weight of the aluminum melt.

6. The method for preparing a praseodymium-modified regenerated aluminum alkaline air battery anode material according to claim 4, characterized in that: The aluminum-praseodymium master alloy is Al-14Pr.

7. The method for preparing a praseodymium-modified regenerated aluminum alkaline air battery anode material according to claim 4, wherein the aluminum-manganese master alloy is Al-20Mn.

8. The praseodymium-modified regenerated aluminum alkaline air battery anode material according to claim 4, characterized in that: The preparation process of the praseodymium-modified regenerated aluminum alkaline air battery anode material is carried out under argon protection.

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