High-casting-yield manganese additive for aluminum alloy and preparation method of high-casting-yield manganese additive

Abstract

The invention discloses a high-casting-yield manganese additive for an aluminum alloy and a preparation method of the high-casting-yield manganese additive, and relates to the technical field of additives for aluminum alloy production. The manganese additive comprises a plurality of additive monomers, each additive monomer at least comprises a core body and a coating body, the core body is coated with the coating body, and the coating body at least comprises the following raw materials in parts by weight: 1-5 parts of a fluxing agent; 2-4 parts by weight of a binder; the core body at least comprises the following raw materials in parts by weight: 80-95 parts of manganese powder; 5-15 parts by weight of aluminum powder; 1-2 parts by weight of a surfactant; wherein the additive monomer accounts for at most one eighth of the total volume of the manganese additive. The high-casting-yield manganese additive for the aluminum alloy has the advantages of being high in casting yield, short in melting time and low in melting temperature.

Description

Technical Field

[0001] The invention relates to the technical field of additives for aluminum alloy production, and in particular to a high-yield manganese additive for aluminum alloy and a preparation method thereof. Background Art

[0002] With the continuous development of aluminum processing and aluminum alloy industry, the research and development of aluminum alloys has been listed as a key development technology, and alloying is an important part of the aluminum alloy production process. Common alloying elements of aluminum alloys are: silicon, iron, copper, manganese, magnesium, chromium, nickel, zinc, vanadium, titanium, etc. Some alloying elements with low melting points or high solubility, such as magnesium and copper, can be directly added to the aluminum melt, while most alloying elements with high melting points, such as iron, nickel, and manganese, need to be made into intermediate alloy additives such as Al-Fe, Al-Ni, and Al-Mn. At present, alloying elements are generally added to aluminum liquid in the form of metal additives at home and abroad, so the research and development of aluminum alloy additives has also become a focus of aluminum industry research.

[0003] The quality of aluminum alloy is closely related to the form and method of elements added during smelting. However, the additives currently used in domestic aluminum alloy production only meet the actual requirements to a certain extent, and cannot completely meet the requirements of producing high-quality aluminum alloys. In order to further improve the performance of aluminum alloys, manganese is widely used as an alloy additive. Manganese plays an important role in aluminum alloys, which can improve the strength, plasticity and corrosion resistance of the alloy, and can significantly improve the strength of aluminum alloys. Adding an appropriate amount of manganese to aluminum alloys can form solid solutions and precipitates, which can effectively prevent the slip and diffusion of crystals.

[0004] At present, there are many manganese additives in China, mainly composed of metal powder and flux, and the traditional additives of halide salts are commonly used as flux. Although the problem of adding in the form of aluminum-based master alloy has been solved, it contains elements such as sodium, chlorine, and fluorine, which not only pollutes the environment, but also affects human health. In addition, in the production process of existing manganese additives, if the manganese powder is too fine, it will burn due to its large surface energy and adsorption of more oxygen, resulting in low actual recovery rate of manganese (i.e., melting rate of manganese), which in turn leads to inaccurate manganese content in aluminum alloy, resulting in poor quality of aluminum alloy; if the manganese powder is too coarse, the distance from the inside of the manganese powder to the surface is long and the temperature rise of the manganese powder is slow, which makes the melting temperature of the manganese additive high and the melting rate slow. That is, the melting speed of the existing manganese additives in the casting process is relatively slow, the actual recovery rate is relatively low, the production process is relatively complicated, and when the melting temperature is higher than 850°C, the melting time needs to be as long as 1 hour, which makes the aluminum burn seriously, and it is particularly easy to form infusible residual impurities, which is extremely unfavorable for the quality control of aluminum alloy. Therefore, the existing manganese additives used in aluminum alloys have disadvantages such as low recovery rate, long melting time and environmental pollution. The melting time, melting temperature and recovery rate need to be further improved. Summary of the invention

[0005] The object of the present invention is to provide a high-yield manganese additive for aluminum alloy and a preparation method thereof, so as to solve the following technical problems: The existing manganese additives for aluminum alloys have the problems of low yield, long melting time and environmental pollution.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A high-yield manganese additive for aluminum alloy, the manganese additive comprising a plurality of additive monomers, the additive monomers comprising at least a core body and a coating body, the coating body wraps the core body, and the coating body comprises at least the following raw materials in parts by weight: Flux 1-5; Binder 2-4; The core body comprises at least the following raw materials in parts by weight: Manganese powder 80-95; Aluminum powder 5-15; Surfactant 1-2; The additive monomer accounts for at most one eighth of the total volume of the manganese additive.

[0007] As a further embodiment of the present invention: the density of the manganese additive is 3.0-3.5 g / cm 3 .

[0008] As a further embodiment of the present invention, the manganese additive is in the shape of a round cake or a rounded rectangular cake.

[0009] As a further solution of the present invention: the particle size distribution of the manganese powder is as follows: 500-700 mesh accounts for 20-40%, 300-500 mesh accounts for 30-60%, 100-300 mesh accounts for 5-15%, and 10-100 mesh accounts for less than 5%.

[0010] As a further solution of the present invention: the particle size distribution of the aluminum powder is 400-700 mesh accounting for 40-60%, 100-400 mesh accounting for 35-50%, 10-100 mesh accounting for less than 5%, and the particle size of the flux is 100-400 mesh.

[0011] As a further embodiment of the present invention, the binder is at least one of starch, oil or higher fatty acid binders, and the flux is aluminum powder, iron powder, KF, MgF 2 , K 2 CO 3 , CaC0 3 , K 2 S0 4At least one of the surfactants, wherein the surfactant is at least one of sodium hexafluoroaluminate, sodium dodecylbenzene sulfonate or polysorbate.

[0012] A method for preparing a high-yield manganese additive for aluminum alloy as described in any one of the above, comprising at least the following steps: The manganese powder, flux and aluminum powder are crushed and sieved into powder with a particle size of 10-700 mesh under nitrogen protection; The manganese powder, the aluminum powder and a surfactant in an aqueous solution are mixed and granulated by rotating a high-speed rotor in a metal powder granulator protected by nitrogen to obtain a core body; The flux and the binder are added into a metal powder granulator and mixed evenly, and then the core body is added and further mixed and granulated, so that the flux and the binder are coated on the core body to form an additive monomer; Then, the additive monomer is fed into a compression molding machine, compression molded and dried to obtain a manganese additive.

[0013] As a further embodiment of the present invention: the diameter of the core is at least 3 mm and the density is 2.0-3.0 g / cm 3 .

[0014] As a further solution of the present invention: the pressure of the compression molding is 4-8 MPa.

[0015] Beneficial effects of the present invention: The manganese additive prepared by the present application has high manganese content, low content of introduced impurities, good quality of aluminum alloy, low density and small deviation, and does not contain elements such as Na and Cl, reducing the environmental pollution caused. In the present application, manganese powder, aluminum powder and surfactant are granulated to form a core body, flux and binder are formed into a coating body wrapped on the core body, and then pressed into a finished product, so that the particle size distribution range is wider, and manganese powder with small particle size and more distribution can also form a manganese additive under a relatively small pressure, solving the problems that the existing coarse particle mixture flow is easy to separate, the main element content deviation of the production aluminum alloy metal additive is large, the fine powder material aluminum alloy metal additive is not easy to mix, the material fluidity is poor, it is not easy to press and form, the pressing dust pollutes the environment and loses materials, and the existing aluminum alloy metal additive has high pressing density and is not easy to melt, and the actual yield rate of casting is low and unstable. The technical difficulties and shortcomings improve the actual yield of the manganese additive, reduce the melting temperature, shorten the melting time, and improve the product quality and production efficiency of the aluminum alloy tube.

[0016] In the present application, a core body is formed by manganese powder, aluminum powder and a surfactant. By making the surfactant into an aqueous solution, the powder material can be formed into spherical particles with a diameter of at least 3 mm by a granulator. The surfactant can play the role of polymerizing powder, prompting the raw material powder to form a core body with a smaller density under the condition of less pressure, saving energy, and the surfactant can also play the role of reducing the surface tension between the manganese additive and the aluminum liquid phase interface, so that the manganese additive is more easily dissolved in the aluminum liquid, avoiding the problem of burning due to the excessively fine manganese powder, which leads to a large surface energy and more oxygen adsorption, reducing the melting temperature, shortening the melting time, and in addition, the surfactant has a suspending effect, so that the manganese additive core body of the present invention can be in a suspended state in the aluminum melt, will not sink to the bottom, and the melting speed is accelerated, greatly shortening the additive melting time, and the manganese powder is more evenly dispersed in the aluminum melt after melting, further improving the actual yield. At the same time, the aluminum powder can also play the role of a bonding powder in the process of pressing the manganese additive, which is convenient for the core body molding of the manganese additive, and aluminum is the main element of the aluminum alloy, and adding aluminum powder to the manganese additive will not cause the increase of impurities.

[0017] In the present application, a binder and a flux are formed into a coating to wrap the outer side of the early core body. When the manganese additive is melted in the aluminum liquid, the flux rapidly undergoes an exothermic reaction to release a large amount of heat, causing the manganese additive to heat up rapidly, thereby causing the manganese additive to decompose into multiple additive monomers more quickly and expose the core body. Moreover, since the reaction itself releases a large amount of heat, the manganese powder in the core body can be dissolved in the aluminum liquid at a relatively low temperature, with a low melting temperature and a short melting time. And because of the presence of the surfactant in the core body, the core body will not absorb too much oxygen and burn when it slowly disperses, ensuring a high actual yield of manganese in the manganese additive, and the manganese additive of the present invention containing more fine-grained powder can also be smoothly dissolved in the aluminum liquid; and when there are more fine-grained powders in the manganese additive, the coarse-grained powder will be surrounded and wrapped by the fine-grained powder, and the fine-grained powder will heat up first, and transfer the temperature to the coarse-grained powder through the contact surface with the coarse-grained powder, so that the coarse-grained powder absorbs heat in many aspects, so that the coarse-grained powder quickly heats up and melts, even if there are coarser particles in the manganese additive, it can also be quickly melted. As a result, the particle size distribution of the manganese powder in the manganese additive of the present invention is wider and can also be quickly melted. In addition, due to the bonding effect, the manganese additive can also form a cake-shaped finished manganese additive with a stable and firm structure under a pressure of 4-8 MPa, and the density of the obtained manganese additive is as small as 3.0-3.5g / cm 3 It will not crack, therefore, compared with the existing manganese additives, the manganese additive of the present invention is looser, and the interaction between the powders in the manganese additive is smaller, that is, less energy is required for melting and dispersion, and it is easier to disperse and melt, that is, the temperature required for melting is lower and the time is shorter. DETAILED DESCRIPTION

[0018] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1 A method for preparing a high-yield manganese additive for aluminum alloy comprises the following steps: 85 parts by mass of manganese powder, 5 parts by mass of aluminum powder and 5 parts by mass of flux are crushed into powders of different particle sizes under nitrogen protection; wherein the particle size distribution of manganese powder is 500-700 mesh accounting for 40%, 300-500 mesh accounting for 50%, 100-300 mesh accounting for 5%, 10-100 mesh accounting for 5%, the particle size distribution of aluminum powder is 400-700 mesh accounting for 55%, 100-400 mesh accounting for 40%, 10-100 mesh accounting for 5%, and the particle size of flux is 100-400 mesh; 1 part by mass of surfactant was prepared into an aqueous solution. The crushed manganese powder, aluminum powder and aqueous solution of surfactant were mixed and granulated by high-speed rotor rotation in a metal powder granulator protected by nitrogen to obtain a granule with a diameter of 5 mm and a density of 2.5 g / cm 3 The nuclear body; 5 parts by weight of flux and 4 parts by weight of binder are added into a metal powder granulator and mixed evenly, and then the core body is added and mixed and granulated continuously, so that the flux and binder are coated on the core body to form an additive monomer; Then the above additive monomers were fed into a compression molding machine and pressed into round cakes at 8 MPa. The cakes were placed in a dryer under nitrogen protection at 200°C for 50 minutes to obtain a cake with a size of φ85 mm×25 mm and a density of 3.2 g / cm 3 The finished manganese additive is in the form of a round cake.

[0020] Example 2 A method for preparing a high-yield manganese additive for aluminum alloy comprises the following steps: 80 parts by mass of manganese powder, 10 parts by mass of aluminum powder and 3 parts by mass of flux are crushed into powders of different particle sizes under nitrogen protection; wherein the particle size distribution of manganese powder is 500-700 mesh accounting for 40%, 300-500 mesh accounting for 50%, 100-300 mesh accounting for 5%, 10-100 mesh accounting for 5%, the particle size distribution of aluminum powder is 400-700 mesh accounting for 55%, 100-400 mesh accounting for 40%, 10-100 mesh accounting for 5%, and the particle size of flux is 100-400 mesh; 2 parts by mass of surfactant were prepared into an aqueous solution. The crushed manganese powder, aluminum powder and aqueous solution of surfactant were mixed and granulated by high-speed rotor rotation in a metal powder granulator protected by nitrogen to obtain a granulated product with a diameter of 5 mm and a density of 2.5 g / cm 3 The nuclear body; 3 parts by weight of flux and 5 parts by weight of binder are added into a metal powder granulator and mixed evenly, and then the core body is added and mixed and granulated continuously, so that the flux and binder are coated on the core body to form an additive monomer; Then the above additive monomers were fed into a compression molding machine and pressed into round cakes at 8 MPa. The cakes were placed in a dryer under nitrogen protection at 200°C for 50 minutes to obtain a cake with a size of φ85 mm×25 mm and a density of 3.2 g / cm 3 The finished manganese additive is in the form of a round cake.

[0021] Example 3 A method for preparing a high-yield manganese additive for aluminum alloy comprises the following steps: 85 parts by mass of manganese powder, 5 parts by mass of aluminum powder and 5 parts by mass of flux are crushed into powders of different particle sizes under nitrogen protection; wherein the particle size distribution of manganese powder is 500-700 mesh accounting for 50%, 300-500 mesh accounting for 40%, 100-300 mesh accounting for 7%, 10-100 mesh accounting for 3%, the particle size distribution of aluminum powder is 400-700 mesh accounting for 60%, 100-400 mesh accounting for 35%, 10-100 mesh accounting for 5%, and the particle size of flux is 100-400 mesh; 1 part by mass of surfactant was prepared into an aqueous solution. The crushed manganese powder, aluminum powder and aqueous solution of surfactant were mixed and granulated by high-speed rotor rotation in a metal powder granulator protected by nitrogen to obtain a granule with a diameter of 5 mm and a density of 2.5 g / cm 3 The nuclear body; 5 parts by weight of flux and 4 parts by weight of binder are added into a metal powder granulator and mixed evenly, and then the core body is added and mixed and granulated continuously, so that the flux and binder are coated on the core body to form an additive monomer; Then the above additive monomers were fed into a compression molding machine and pressed into round cakes at 8 MPa. The cakes were placed in a dryer under nitrogen protection at 200°C for 50 minutes to obtain a cake with a size of φ85 mm×25 mm and a density of 3.2 g / cm 3 The finished manganese additive is in the form of a round cake.

[0022] Example 4 A method for preparing a high-yield manganese additive for aluminum alloy comprises the following steps: 85 parts by mass of manganese powder, 5 parts by mass of aluminum powder and 5 parts by mass of flux are crushed into powders of different particle sizes under nitrogen protection; wherein the particle size distribution of manganese powder is 500-700 mesh accounting for 40%, 300-500 mesh accounting for 50%, 100-300 mesh accounting for 5%, 10-100 mesh accounting for 5%, the particle size distribution of aluminum powder is 400-700 mesh accounting for 55%, 100-400 mesh accounting for 40%, 10-100 mesh accounting for 5%, and the particle size of flux is 100-400 mesh; 1 part by mass of surfactant was prepared into an aqueous solution. The crushed manganese powder, aluminum powder and aqueous solution of surfactant were mixed and granulated by high-speed rotor rotation in a metal powder granulator protected by nitrogen to obtain a granule with a diameter of 7 mm and a density of 2.5 g / cm 3 The nuclear body; 5 parts by weight of flux and 4 parts by weight of binder are added into a metal powder granulator and mixed evenly, and then the core body is added and mixed and granulated continuously, so that the flux and binder are coated on the core body to form an additive monomer; Then the above additive monomers were fed into a compression molding machine and pressed into a rounded rectangular cake at 10 MPa. The cake was placed in a dryer under nitrogen protection at 200°C for 50 minutes to obtain a cake with a size of φ45 mm×30 mm×25 mm and a density of 3.5 g / cm 3 The finished manganese additive is in the shape of a rounded rectangular cake.

[0023] Comparative Example 1 A method for preparing a high-yield manganese additive for aluminum alloy comprises the following steps: 85 parts by mass of manganese powder, 5 parts by mass of aluminum powder and 5 parts by mass of flux are crushed into powders of different particle sizes under nitrogen protection; wherein the particle size distribution of manganese powder is 100-325 mesh accounting for 35-55%, 80-100 mesh accounting for 15-20%, 60-80 mesh accounting for 30-35%, 10-60 mesh accounting for less than 5%, the particle size distribution of aluminum powder is 100-325 mesh accounting for 20-35%, 80-100 mesh accounting for 20-30%, 40-80 mesh accounting for 30-35%, 10-40 mesh accounting for less than 5%, and the particle size of flux is 100-400 mesh; 1 part by mass of surfactant was prepared into an aqueous solution. The crushed manganese powder, aluminum powder and aqueous solution of surfactant were mixed and granulated by high-speed rotor rotation in a metal powder granulator protected by nitrogen to obtain a granule with a diameter of 5 mm and a density of 2.5 g / cm 3 The nuclear body; 5 parts by weight of flux and 4 parts by weight of binder are added into a metal powder granulator and mixed evenly, and then the core body is added and mixed and granulated continuously, so that the flux and binder are coated on the core body to form an additive monomer; Then the above additive monomers were fed into a compression molding machine and pressed into round cakes at 8 MPa. The cakes were placed in a dryer under nitrogen protection at 200°C for 50 minutes to obtain a cake with a size of φ85 mm×25 mm and a density of 3.2 g / cm 3 The finished manganese additive is in the form of a round cake.

[0024] Comparative Example 2 A method for preparing a high-yield manganese additive for aluminum alloy comprises the following steps: 85 parts by mass of manganese powder, 5 parts by mass of aluminum powder and 5 parts by mass of flux are crushed into powders of different particle sizes under nitrogen protection; wherein the particle size distribution of manganese powder is 500-700 mesh accounting for 40%, 300-500 mesh accounting for 50%, 100-300 mesh accounting for 5%, 10-100 mesh accounting for 5%, the particle size distribution of aluminum powder is 400-700 mesh accounting for 55%, 100-400 mesh accounting for 40%, 10-100 mesh accounting for 5%, and the particle size of flux is 100-400 mesh; 1 part by mass of surfactant was prepared into an aqueous solution. The crushed manganese powder, aluminum powder and aqueous solution of surfactant were mixed and granulated by high-speed rotor rotation in a metal powder granulator protected by nitrogen to obtain a granule with a diameter of 5 mm and a density of 2.5 g / cm 3 The nuclear body; 5 parts by weight of flux and 4 parts by weight of binder are added into a metal powder granulator and mixed evenly, and then the core body is added and mixed and granulated continuously, so that the flux and binder are coated on the core body to form an additive monomer; Then the above additive monomers were fed into a compression molding machine and pressed into round cakes at 20 MPa. The cakes were placed in a dryer under nitrogen protection at 200 °C for 50 minutes to obtain a cake with a size of φ80 mm × 20 mm and a density of 4.5 g / cm 3 The finished manganese additive is in the form of a round cake.

[0025] Comparative Example 3 A method for preparing a high-yield manganese additive for aluminum alloy comprises the following steps: 85 parts by mass of manganese powder, 5 parts by mass of aluminum powder and 5 parts by mass of flux are crushed into powders of different particle sizes under nitrogen protection; wherein the particle size distribution of manganese powder is 500-700 mesh accounting for 40%, 300-500 mesh accounting for 50%, 100-300 mesh accounting for 5%, 10-100 mesh accounting for 5%, the particle size distribution of aluminum powder is 400-700 mesh accounting for 55%, 100-400 mesh accounting for 40%, 10-100 mesh accounting for 5%, and the particle size of flux is 100-400 mesh; 1 part by mass of a surfactant is prepared as an aqueous solution, and the crushed manganese powder, aluminum powder, flux, 4 parts by mass of a binder and the aqueous solution of the surfactant are mixed and granulated by rotating a high-speed rotor in a metal powder granulator protected by nitrogen to form mixed powder spherical particles with a diameter of 0.5-2 mm; Then the mixed powder spherical particles were sent to a pressing machine and pressed into round cakes at 10 MPa. They were placed in a dryer under nitrogen protection at 200 °C for 50 minutes to obtain a round cake with a size of φ82 mm × 22 mm and a density of 3.5 g / cm 3 The finished manganese additive is in the form of a round cake.

[0026] Performance Testing Melt 5 aluminum ingots of the same batch and weight, and stir the aluminum liquid up and down to make the temperature uniform after melting. After heating to 720°C, remove the surface slag, and add the products obtained in Examples 1-4 and Comparative Examples 1-3 to 5 aluminum liquids respectively. After adding, gradually increase the temperature, and measure the initial melting temperature of the manganese additives obtained in Examples 1-4 and Comparative Examples 1-3 respectively. Keep the initial melting temperature of each example respectively, and record the complete melting time of each example product at the melting temperature and the actual yield of manganese element 10 minutes from the initial melting; the test results are shown in the following table:

[0027] As shown in Table 1, the manganese content of 80-95% of the manganese additive in the present application can reach 100% after melting at a temperature of 650-700°C for 10 minutes. Compared with the prior art that reaches the highest manganese actual yield of 80% after melting for 15 minutes, the manganese actual yield is higher, the melting time is shorter, and the melting temperature is lower. In Comparative Example 1, the particle size distribution of manganese powder, aluminum powder and flux reduces the content of particle size above 300 meshes, and in Comparative Example 2, the additive monomer is pressed into a finished manganese additive with a higher density cake shape with a larger pressure. In Comparative Example 3, the raw materials of the manganese additive are directly mixed and then pressed into a finished product. The initial melting temperature of the manganese additive obtained in Comparative Examples 1-3 is high, the melting time is long, and the actual yield is low, indicating that by the preparation method of the present application, the raw material with finer particle size can be prepared into a manganese additive with a lower density, and the structure is stable and not easy to crack. At the same time, the obtained manganese additive is melted in aluminum liquid with high efficiency, low energy consumption and low cost.

[0028] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high-yield manganese additive for aluminum alloys, characterized in that: The manganese additive comprises a plurality of additive monomers, wherein the additive monomers at least comprise a core body and a coating body, wherein the coating body wraps the core body, and the coating body comprises at least the following raw materials in parts by weight: Flux 1-5; Binder 2-4; The core body comprises at least the following raw materials in parts by weight: Manganese powder 80-95; Aluminum powder 5-15; Surfactant 1-2; The additive monomer accounts for at most one eighth of the total volume of the manganese additive.

2. The high-yield manganese additive for aluminum alloy according to claim 1, characterized in that: The density of the manganese additive is 3.0-3.5 g / cm 3 .

3. The high-yield manganese additive for aluminum alloy according to claim 1, characterized in that: The manganese additive is in the shape of a round cake or a rounded rectangular cake.

4. The high-yield manganese additive for aluminum alloy according to claim 1, characterized in that: The particle size distribution of the manganese powder is as follows: 500-700 mesh accounts for 20-40%, 300-500 mesh accounts for 30-60%, 100-300 mesh accounts for 5-15%, and 10-100 mesh accounts for less than 5%.

5. The high-yield manganese additive for aluminum alloy according to claim 1, characterized in that: The particle size distribution of the aluminum powder is that 400-700 mesh accounts for 40-60%, 100-400 mesh accounts for 35-50%, and 10-100 mesh accounts for less than 5%. The particle size of the flux is 100-400 mesh.

6. The high-yield manganese additive for aluminum alloy according to claim 1, characterized in that: The binder is at least one of starch, oil or higher fatty acid binders, the flux is at least one of aluminum powder, iron powder, KF, MgF2, K2CO3, CaC03, K2S04, and the surfactant is at least one of sodium hexafluoroaluminate, sodium dodecylbenzene sulfonate or polysorbate.

7. A method for preparing a high-yield manganese additive for aluminum alloy according to any one of claims 1 to 6, characterized in that: At least the following steps are included: The manganese powder, flux and aluminum powder are crushed and sieved into powders with a particle size of 10-700 mesh under nitrogen protection; The manganese powder, the aluminum powder and a surfactant in an aqueous solution are mixed and granulated by rotating a high-speed rotor in a metal powder granulator protected by nitrogen to obtain a core body; The flux and the binder are added into a metal powder granulator and mixed evenly, and then the core body is added and further mixed and granulated, so that the flux and the binder are coated on the core body to form an additive monomer; Then, the additive monomer is fed into a compression molding machine, compression molded and dried to obtain a manganese additive.

8. The method for preparing a high-yield manganese additive for aluminum alloy according to claim 7, characterized in that: The core has a diameter of at least 3 mm and a density of 2.0-3.0 g / cm 3 .

9. The method for preparing a high-yield manganese additive for aluminum alloy according to claim 7, characterized in that: The pressure of the compression molding is 5-10 MPa.

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