Efficient composite component flux for secondary aluminum as well as preparation method and application of efficient composite component flux

Abstract

The invention discloses an efficient composite component flux for secondary aluminum as well as a preparation method and application thereof, and the flux comprises the following components in percentage by mass: 45-65% of an impurity removal component, 20-25% of an iron removal component and 25-30% of a hydrogen removal component which are respectively composed of fluorine metal salt, boron salt and chlorine metal salt. The preparation method comprises the steps of primary mixing, ultrasonic dispersion, high-temperature sintering, secondary mixing, granulation and the like. In the production of the secondary aluminum, the raw materials are sorted and pretreated, then smelting is performed, a flux is added, argon or nitrogen is introduced for refining and impurity removal, then filtering and component adjustment are performed, and finally casting is performed at the temperature of 680-720 DEG C to obtain a secondary aluminum product. The flux and application can effectively remove secondary aluminum impurities and improve the quality of secondary aluminum, the preparation process is scientific and reasonable, and the flux has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloys, and in particular to a high-efficiency composite component flux for recycled aluminum and application thereof. Background Art

[0002] In the current metal smelting field, flux purification technology is a key link in ensuring metal quality. Traditional flux purification methods mainly rely on single-function fluxes. For example, the simple fluoride salt flux used in the early days can adsorb some oxide inclusions to a certain extent, but it is not effective in removing other types of impurities such as sulfides, and cannot effectively treat iron and hydrogen.

[0003] As technology develops, some fluxes for specific impurities have been developed. For example, fluxes specifically used for iron removal can precipitate iron through simple chemical reactions, but this process easily introduces new impurities and is of no help in purifying other impurities. Hydrogen removal fluxes can only work at specific temperatures and conditions, and have a narrow scope of application.

[0004] Single flux purification is not only inefficient, but also leads to cumbersome production processes. Because different fluxes need to be added multiple times for different impurities, this not only increases production costs, but also prolongs the smelting cycle. At the same time, due to the possible mutual interference between different fluxes, it is difficult to achieve the ideal purification effect.

[0005] Under such circumstances, it is urgent to develop a multifunctional, efficient and stable flux purification solution. The flux of the present invention is born based on solving these problems. Through the synergistic effect of composite fluoride salt, boron salt and chloride salt, it realizes the simultaneous removal of multiple impurities, significantly improving the efficiency of flux purification and the quality of metal products.

[0006] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0007] The purpose of the present invention is to provide a high-efficiency composite component flux for recycled aluminum, a preparation method and its application, so as to solve the technical problems existing in the above-mentioned prior art.

[0008] For this purpose, the present invention adopts the following technical solutions:

[0009] A high-efficiency composite component flux for recycled aluminum comprises the following components by mass percentage: 45%-65% of an impurity removal component, 20%-25% of an iron removal component, and 25%-30% of a hydrogen removal component; wherein the impurity removal component comprises a fluorine metal salt, the iron removal component comprises a boron salt, and the hydrogen removal component comprises a chlorine metal salt.

[0010] Preferably, the fluorine metal salt comprises a combination of NaF, KF, and CaF2; the boron salt is a combination of Na2B4O7 and H3BO3; and the chloride salt is a combination of NaCl, KCl, and LiCl.

[0011] Preferably, a high-efficiency composite component flux for recycled aluminum comprises the following components by mass percentage:

[0012] Impurity removal components: NaF 13%-23%, KF 14%-22%, CaF215%-20%;

[0013] Iron removal components: Na2B4O7 11%-16%, H3BO 36%-9%;

[0014] Dehydrogenation components: NaCl 11%-14%, KCl 12%-14%, LiCl 2%-4%.

[0015] The method for preparing a high-efficiency composite component flux for recycled aluminum comprises the following steps:

[0016] S1. Mixing once: weigh each raw material according to a predetermined mass percentage, add each component raw material together into a blender, and stir to mix the components uniformly to form a preliminary mixture;

[0017] S2. Ultrasonic dispersion treatment: the preliminary mixture is transferred to a container of an ultrasonic dispersion device, and anhydrous ethanol is added to submerge the mixture as a dispersion medium; the ultrasonic dispersion instrument is turned on for treatment, and after the treatment is completed, the anhydrous ethanol is removed by vacuum distillation to obtain a uniformly dispersed mixture;

[0018] S3 high temperature sintering and secondary mixing: the uniformly dispersed mixture obtained in step S2 is placed in a high temperature furnace for sintering; the sintered product is removed and cooled to room temperature; and then added to a ball mill for secondary grinding and mixing to further refine the product and mix it evenly;

[0019] S4. Granulation: After the mixing in step S3 is completed, the mixture is granulated by spray granulation; the mixture is sprayed into a granulation tower through a spray device, dried and solidified to form a granular flux product with a particle size of 1-3 mm.

[0020] Preferably, the rotation speed of the stirrer in step S1 is 500-600 r / min, and the stirring time is 30-40 min.

[0021] Preferably, the ultrasonic disperser in step S2 is set to have a power of 300-500 W, a frequency of 20-40 kHz, and a processing time of 20-30 min.

[0022] Preferably, in step S3, the sintering is performed at 600-700° C. for 1-2 hours and kept at this temperature for 2-3 hours; the rotation speed of the ball mill is set to 300-400 r / min, and the grinding time is 1-2 hours.

[0023] The present invention also provides an application of a high-efficiency composite component flux for recycled aluminum of the above raw material combination or a high-efficiency composite component flux for recycled aluminum prepared by the above preparation method, comprising the following steps:

[0024] a. Raw material sorting and pretreatment: First, the recycled aluminum raw materials are carefully sorted, and the obvious large impurities are separated by a combination of manual selection and mechanical screening; the ferromagnetic impurities are adsorbed by strong magnetic equipment, and the sand and dust are removed by water washing and filtering devices. After washing, the raw materials are dried to remove moisture, and then the remaining moisture and oil stains are removed by heating and drying;

[0025] b. Melting and refining and impurity removal: put the pretreated recycled aluminum into a smelting furnace, preheat it to make the recycled aluminum initially melted, then heat it to complete melting, stabilize the temperature at 720-780℃, add a high-efficiency composite component flux for recycled aluminum to the melt, the addition amount is 0.3%-0.5% of the mass of the recycled aluminum melt; at the same time, introduce refining gas for refining, the refining time is 20-30min;

[0026] c. Composition processing and casting: After refining, the recycled aluminum melt is filtered through a multi-layer ceramic filter plate with pore sizes of 50μm, 30μm, and 10μm respectively; the filtered melt is subjected to composition testing, and according to the target recycled aluminum alloy composition requirements, pure aluminum, silicon, magnesium and other alloy elements are accurately added to adjust the composition; after the adjustment, the treated recycled aluminum melt is cast in the temperature range of 680-720℃ to produce recycled aluminum products.

[0027] Preferably, the drying temperature in step a is set at 150-300°C and the drying time is 40-50min; in step b, the temperature is raised to 300-400°C at a heating rate of 10-15°C / min for preheating for 30-40min; and the temperature is further raised to 750-850°C at a rate of 15-20°C / min.

[0028] Preferably, the refining gas in step b is argon or nitrogen at 0.2-0.3 m 3 / min flow into the smelting furnace.

[0029] The functions and technical principles of the raw materials of the flux of the present invention are as follows:

[0030] Impurity removal components: NaF and KF have a low melting point and good fluidity. They can quickly spread on the surface of the recycled aluminum melt to form a dense covering layer, isolate the air, and prevent the melt from further oxidation. At the same time, they can chemically react with oxide inclusions in the melt, such as 3NaF+Al2O3→2AlF3+3Na2O, converting oxide inclusions into substances that are easier to remove and adsorbing them in the flux layer. CaF2 has high stability and can enhance the strength of the covering layer, making it more durable and effective in removing impurities. The three fluorine metal salts cooperate with each other to synergistically remove impurities from multiple aspects such as covering, reaction, and strengthening the covering layer.

[0031] Iron removal components: Na2B4O7 and H3BO3, as boron salts, can react with the iron element in the recycled aluminum melt. Taking Na2B4O7 as an example, 3Na2B4O7+4Fe→4FeB+6Na2O+5B2O3, the generated iron-boron compound (FeB) has low solubility in the melt and will float to the surface of the melt, making it easy to remove by operations such as slag removal, thereby achieving the purpose of iron removal. The two boron salts complement each other in the iron removal process to improve the iron removal efficiency.

[0032] Dehydrogenation components: NaCl, KCl and LiCl are used as chloride salts, which are decomposed by heat in the regenerated aluminum melt to produce chlorine. Chlorine reacts with hydrogen in the melt, 2H+Cl2→2HCl↑, and the generated hydrogen chloride gas floats up in the form of bubbles, taking hydrogen out of the melt to achieve the dehydrogenation effect. The three chloride salts work together to increase the amount of chlorine produced and the chance of contact with hydrogen, thereby improving the dehydrogenation performance.

[0033] Synergistic effect: The stable covering layer formed by the impurity removal component provides a good environment for iron removal and dehydrogenation reactions, reduces interference from external factors, and avoids secondary contamination by impurities. The iron removal component reduces the iron content, reduces the negative impact of iron on the performance of recycled aluminum, and also avoids the generation of new impurities due to the reaction of iron with other components, which is conducive to the dehydrogenation reaction. The dehydrogenation component reduces the hydrogen content, prevents the generation of hydrogen pores, improves the purity of the melt, and makes the impurity removal and iron removal effects more stable. The synergistic effect of the three significantly improves the comprehensive performance of the flux.

[0034] The technical principles of each step of the flux preparation process of the present invention are as follows:

[0035] Primary mixing: After accurately weighing the raw materials according to the predetermined mass percentage, stir them in a mixer at 500-600r / min for 30-40min to make the raw materials preliminarily mixed evenly. This step is the basis for subsequent reactions and performance, ensuring that the raw materials can be evenly distributed in the initial stage, providing a uniform material basis for subsequent ultrasonic dispersion, sintering and other steps, ensuring that the components are fully in contact at the microscopic level, and creating conditions for synergistic reactions.

[0036] Ultrasonic dispersion treatment: The preliminary mixture is transferred to an ultrasonic dispersion device, anhydrous ethanol is added as a dispersion medium, and the mixture is treated at a power of 300-500W and a frequency of 20-40kHz for 20-30 minutes, and then the anhydrous ethanol is removed by reduced pressure distillation. Ultrasonic dispersion uses the cavitation effect and mechanical effect of ultrasound to further refine the raw material particles, greatly increase the contact area between the components, enable the raw materials to be mixed more closely, significantly improve the reaction activity, and ensure that the components can fully react in the subsequent sintering process, thereby improving the performance of the flux.

[0037] High temperature sintering and secondary mixing: sintering at 600-700℃ for 1-2h and keeping warm for 2-3h can make the raw materials react in solid phase, form a more stable structure, and enhance the activity and purification performance of the flux. The sintered product is cooled to room temperature and then ground in a ball mill at 300-400r / min for 1-2h for secondary mixing, which can further refine the particles and make the distribution of components more uniform, make up for the problem of component segregation that may occur during the sintering process, and ensure the consistency and stability of the flux performance.

[0038] Granulation: Spray granulation is adopted to spray the mixture into the granulation tower, dry and solidify to form 1-3mm granular flux products. This granular form is conducive to uniform dispersion in the melt during the smelting process of recycled aluminum, increasing the contact area and reaction efficiency between the flux and the melt, facilitating storage, transportation and use, and ensuring that the flux can fully play the role of removing impurities, iron and hydrogen in practical applications.

[0039] The beneficial effects of the present invention compared with the prior art include:

[0040] (1) Better impurity removal effect: Traditional fluxes usually only remove single or a few impurities, and it is difficult to comprehensively solve the problem of multiple impurities in recycled aluminum. Some fluxes can only adsorb oxide inclusions, and the removal effect on iron and hydrogen is poor, resulting in the presence of more impurities in the recycled aluminum product, affecting the performance and quality stability of the product. The flux of the present invention contains multiple functional components such as impurity removal, iron removal, and hydrogen removal, and can effectively remove multiple impurities such as oxides, sulfides, iron elements, hydrogen, etc. in recycled aluminum at the same time. Through the synergistic effect of each component, the purification ability of the flux is significantly improved, so that the purity of the recycled aluminum is higher and the performance is more stable, which can meet the strict requirements of high-end application fields on material quality.

[0041] (2) The preparation process is more advanced: The preparation process of traditional flux is relatively simple, usually only simple mixing and sintering treatments are performed, which cannot fully refine the particles and improve the uniformity of the components. This results in a small contact area between the flux and the recycled aluminum melt during use, insufficient reaction, and low purification efficiency. The preparation process of the present invention includes multiple steps such as primary mixing, ultrasonic dispersion treatment, high-temperature sintering, secondary mixing and granulation. Ultrasonic dispersion treatment can effectively refine the particles, increase the contact area between the components, and improve the reaction activity; secondary mixing further improves the uniformity of the components; the granulation process allows the flux to form particles of a specific particle size, which is conducive to uniform dispersion in the recycled aluminum melt and improves the reaction efficiency. These advanced preparation process steps work together to significantly improve the quality and performance of the flux.

[0042] (3) The application process is more perfect: the existing recycled aluminum production process is not sophisticated enough in the links of raw material pretreatment, smelting, refining and casting, and lacks precise control and optimization of each link, resulting in high energy consumption in the production process, low production efficiency and unstable product quality. The application process of the present invention optimizes and controls each link of recycled aluminum production in detail. In the raw material pretreatment stage, a variety of methods are used to remove impurities to improve the purity of the raw materials; in the smelting and refining process, parameters such as temperature, flux addition and refining gas flow are precisely controlled to improve the impurity removal efficiency; in the component processing and casting stage, precise component detection and adjustment are performed to ensure that the product composition meets the requirements. This perfect application process not only improves production efficiency and reduces energy consumption, but also ensures the stability and consistency of product quality. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0044] Example 1

[0045] A high-efficiency composite flux for recycled aluminum, comprising the following components by mass percentage:

[0046] Impurity removal components: NaF 19%, KF 16%, CaF2 15%;

[0047] Iron removal components: Na2B4O713%, H3BO37%;

[0048] Dehydrogenation components: NaCl 12%, KCl 14%, LiCl 4%.

[0049] The method for preparing a high-efficiency composite component flux for recycled aluminum comprises the following steps:

[0050] S1. Mixing once: weigh each raw material according to a predetermined mass percentage, add each component raw material together into a blender, and stir to mix the components uniformly to form a preliminary mixture; the blender speed is 550r / min, and the stirring time is 35min;

[0051] S2. Ultrasonic dispersion treatment: the preliminary mixture is transferred to a container of an ultrasonic dispersion device, and anhydrous ethanol is added to submerge the mixture as a dispersion medium; the ultrasonic disperser is turned on for treatment, and the ultrasonic disperser is set to a power of 400 W, a frequency of 25 kHz, and a treatment time of 25 min; after the treatment is completed, the anhydrous ethanol is removed by vacuum distillation to obtain a uniformly dispersed mixture;

[0052] S3. High-temperature sintering and secondary mixing: The uniformly dispersed mixture obtained in step S2 is placed in a high-temperature furnace for sintering; sintered at 650°C for 1.5 hours and kept at this temperature for 2 hours; the sintered product is taken out and cooled to room temperature; then added to the ball mill for secondary grinding and mixing, the speed of the ball mill is set to 350r / min, and the grinding time is 1.5 hours. The product is further refined and mixed evenly;

[0053] S4. Granulation: After the mixing in step S3 is completed, the mixture is granulated by spray granulation; the mixture is sprayed into a granulation tower through a spray device, dried and solidified to form a granular flux product with a particle size of 1-3 mm.

[0054] The application of the high-efficiency composite component flux for recycled aluminum comprises the following steps:

[0055] a. Raw material sorting and pretreatment: First, the recycled aluminum raw materials are carefully sorted, and the obvious large impurities are separated by a combination of manual selection and mechanical screening; the ferromagnetic impurities are adsorbed by strong magnetic equipment, and the sand and dust are removed by water washing and filtering devices. After washing, the raw materials are dried to remove moisture, and then the remaining moisture and oil stains are removed by heating and drying; the drying temperature is set at 200℃, and the drying time is 45 minutes;

[0056] b. Melting and refining and impurity removal: put the pretreated recycled aluminum into the melting furnace, preheat it to make the recycled aluminum initially melted, and heat it to 300℃ at a heating rate of 15℃ / min for 30min; continue to heat it to 780℃ at a rate of 20℃ / min;

[0057] Then the temperature is raised to complete melting, and the temperature is stabilized at 750°C. A high-efficiency composite flux for recycled aluminum is added to the melt, and the amount added is 0.5% of the mass of the recycled aluminum melt; at the same time, a refining gas is introduced for refining, and the refining gas is argon gas at 0.3m 3 / min flow rate into the smelting furnace; the refining time is 20min;

[0058] c. Composition processing and casting: After refining, the recycled aluminum melt is filtered through a multi-layer ceramic filter plate with pore sizes of 50μm, 30μm, and 10μm respectively; the filtered melt is tested for composition, and according to the target recycled aluminum alloy composition requirements, pure aluminum, silicon, magnesium and other alloy elements are accurately added to adjust the composition; after the adjustment, the treated recycled aluminum melt is cast in a temperature range of 700℃ to produce recycled aluminum products.

[0059] Example 2

[0060] A high-efficiency composite flux for recycled aluminum, comprising the following components by mass percentage:

[0061] Impurity removal components: NaF 20%, KF 17%, CaF2 16%;

[0062] Iron removal components: Na2B4O714%, H3BO38%;

[0063] Dehydrogenation components: NaCl 11%, KCl 12%, LiCl 2%.

[0064] The preparation method of the high-efficiency composite component flux for recycled aluminum is the same as that in Example 1;

[0065] The application of the high-efficiency composite component flux for recycled aluminum is the same as in Example 1.

[0066] Example 3

[0067] A high-efficiency composite flux for recycled aluminum, comprising the following components by mass percentage:

[0068] Impurity removal components: NaF 15%, KF 18%, CaF2 18%;

[0069] Iron removal components: Na2B4O712%, H3BO37%;

[0070] Dehydrogenation components: NaCl 13%, KCl 13%, LiCl 4%.

[0071] The preparation method of the high-efficiency composite component flux for recycled aluminum is the same as that in Example 1;

[0072] The application of the high-efficiency composite component flux for recycled aluminum is the same as in Example 1.

[0073] Comparative Examples 1-3

[0074] The specific components of the high-efficiency composite component flux for recycled aluminum are shown in Table 1; the preparation method of the high-efficiency composite component flux for recycled aluminum is the same as that in Example 1; and the application of the high-efficiency composite component flux for recycled aluminum is the same as that in Example 1.

[0075] Table 1: Ratio of each component in Comparative Examples 1-3

[0076]

[0077] The performance indexes of the recycled aluminum material treated with the flux of the present invention were tested. The aluminum alloy materials obtained in Examples 1-3 and Comparative Examples 1-3 were tested with an OBGS1000 direct-reading spectrometer to measure the removal level of impurity elements. The aluminum alloy materials obtained in Examples 1-3 and Comparative Examples 1-3 were tested with an HDA-V hydrogen meter to measure the hydrogen content of the aluminum liquid in the furnace before and after refining. The results are shown in Table 2.

[0078] Table 2: Data of impurity elements and hydrogen content before and after refining in Examples 1-3 and Comparative Examples 1-3

[0079]

[0080]

[0081] Analysis of the impact of impurity removal components:

[0082] Embodiment: Embodiments 1-3 all contain complete impurity removal components (NaF, KF, CaF2), and perform well in impurity removal. For example, the removal efficiency of Si in Embodiment 1 reaches 61.72%, indicating that the impurity removal components have a significant effect on removing impurities such as Si. At the same time, the removal efficiency of hydrogen content, Fe, Cr, Mg and other elements is also maintained at a certain level, indicating that the impurity removal components play a synergistic role in the removal of multiple impurities.

[0083] Comparative Example: Comparative Example 1 has no impurity removal component at all, and its removal efficiency of each impurity element is significantly lower than that of the examples. For example, the Fe removal efficiency in Comparative Example 1 is only 23.97%, which is much lower than the Fe removal efficiency of Examples 1-3 (54.78%-60.71%). This shows that the impurity removal component is indispensable in the process of flux impurity removal, and the lack of this component greatly weakens the impurity removal ability of the flux.

[0084] Analysis of the impact of iron removal components:

[0085] Embodiment: The iron removal components (Na2B4O7, H3BO3) in the embodiment are complete, and the removal efficiency of Fe is relatively high, such as the Fe removal efficiency of embodiment 1 is 60.71%, which indicates that the iron removal components can effectively react with Fe to achieve the removal of Fe.

[0086] Comparative Example: Comparative Example 2 removes Na2B4O7 and H3BO3 from the iron removal components, and its Fe removal efficiency is the worst among all combinations, only 19.40%. This fully demonstrates the key role of the iron removal component in the iron removal performance of the flux. The lack of this component makes the flux almost lose the ability to effectively remove Fe.

[0087] Analysis of the impact of hydrogen removal components:

[0088] Example: The example contains complete dehydrogenation components (NaCl, KCl, LiCl), and has good performance in dehydrogenation. For example, the hydrogen removal efficiency of Example 1 is 61.05%, which shows that the dehydrogenation components play an important role in reducing the hydrogen content in the recycled aluminum.

[0089] Comparative Example: Comparative Example 3 removes NaCl, KCl and LiCl from the dehydrogenation component, and its hydrogen removal efficiency drops significantly to 16.08%, which is much lower than that of the embodiment. This shows that the dehydrogenation component is the key to the efficient dehydrogenation of the flux, and the lack of this component seriously affects the dehydrogenation performance of the flux.

[0090] In summary, the embodiments are relatively balanced and overall high in terms of hydrogen content, removal efficiency of impurities such as Fe, Cr, Si, and Mg due to the complete components, and can achieve comprehensive purification of recycled aluminum. Comparative Examples 1-3 lack impurity removal, iron removal, and hydrogen removal components, respectively, and have obvious shortcomings in the corresponding functions, resulting in overall performance inferior to the embodiments. This further proves that there is a synergistic effect between the components in the efficient composite component flux for recycled aluminum. Only when the components are reasonably matched can the flux play the best comprehensive performance such as impurity removal, iron removal, and hydrogen removal, and achieve efficient purification of recycled aluminum.

[0091] The above contents are further detailed descriptions of the present invention in combination with specific / preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can also make several substitutions or modifications to these described embodiments without departing from the concept of the present invention, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention.

Claims

1. A high-efficiency composite flux for recycled aluminum, characterized in that: The following components are included by mass percentage: 45%-65% of impurity removal component, 20%-25% of iron removal component, and 25%-30% of hydrogen removal component; wherein the impurity removal component includes fluorine metal salt, the iron removal component includes boron salt, and the hydrogen removal component includes chlorine metal salt.

2. The high-efficiency composite flux for recycled aluminum according to claim 1, characterized in that: The fluorine metal salt comprises a combination of NaF, KF, and CaF2; the boron salt is a combination of Na2B4O7 and H3BO3; and the chloride salt is a combination of NaCl, KCl, and LiCl.

3. The high-efficiency composite flux for recycled aluminum according to claim 1, characterized in that: A high-efficiency composite flux for recycled aluminum, comprising the following components by mass percentage: Impurity removal components: NaF 13%-23%, KF 14%-22%, CaF215%-20%; Iron removal components: Na2B4O7 11%-16%, H3BO 36%-9%; Dehydrogenation components: NaCl 11%-14%, KCl 12%-14%, LiCl 2%-4%.

4. A method for preparing a high-efficiency composite component flux for recycled aluminum according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Mixing once: weigh each raw material according to a predetermined mass percentage, add each component raw material together into a blender, and stir to mix the components uniformly to form a preliminary mixture; S2. Ultrasonic dispersion treatment: the preliminary mixture is transferred to a container of an ultrasonic dispersion device, and anhydrous ethanol is added to submerge the mixture as a dispersion medium; the ultrasonic dispersion instrument is turned on for treatment, and after the treatment is completed, the anhydrous ethanol is removed by vacuum distillation to obtain a uniformly dispersed mixture; S3 high temperature sintering and secondary mixing: the uniformly dispersed mixture obtained in step S2 is placed in a high temperature furnace for sintering; the sintered product is removed and cooled to room temperature; and then added to a ball mill for secondary grinding and mixing to further refine the product and mix it evenly; S4. Granulation: After the mixing in step S3 is completed, the mixture is granulated by spray granulation; the mixture is sprayed into a granulation tower through a spray device, dried and solidified to form a granular flux product with a particle size of 1-3 mm.

5. The method for preparing a high-efficiency composite component flux for recycled aluminum according to claim 4, characterized in that: In step S1, the speed of the mixer is 500-600 r / min, and the stirring time is 30-40 min.

6. The method for preparing a high-efficiency composite component flux for recycled aluminum according to claim 4, characterized in that: In step S2, the ultrasonic disperser is set to have a power of 300-500 W, a frequency of 20-40 kHz, and a processing time of 20-30 min.

7. The method for preparing a high-efficiency composite component flux for recycled aluminum according to claim 4, characterized in that: In step S3, the sintering is carried out at a temperature of 600-700° C. for 1-2 hours and kept at this temperature for 2-3 hours; the rotation speed of the ball mill is set to 300-400 r / min and the grinding time is 1-2 hours.

8. An application of the high-efficiency composite flux for recycled aluminum according to any one of claims 1 to 3 or the high-efficiency composite flux for recycled aluminum prepared by the preparation method according to any one of claims 4 to 7, comprising the following steps: a. Raw material sorting and pretreatment: First, the recycled aluminum raw materials are carefully sorted, and the obvious large impurities are separated by a combination of manual selection and mechanical screening; the ferromagnetic impurities are adsorbed by strong magnetic equipment, and the sand and dust are removed by water washing and filtering devices. After washing, the raw materials are dried to remove moisture, and then the remaining moisture and oil stains are removed by heating and drying; b. Melting and refining and impurity removal: put the pretreated recycled aluminum into a smelting furnace, preheat it to make the recycled aluminum initially melted, then heat it to complete melting, stabilize the temperature at 720-780℃, add a high-efficiency composite component flux for recycled aluminum to the melt, the addition amount is 0.3%-0.5% of the mass of the recycled aluminum melt; at the same time, introduce refining gas for refining, the refining time is 20-30min; c. Composition processing and casting: After refining, the recycled aluminum melt is filtered through a multi-layer ceramic filter plate with pore sizes of 50μm, 30μm, and 10μm respectively; the filtered melt is subjected to composition testing, and according to the target recycled aluminum alloy composition requirements, pure aluminum, silicon, magnesium and other alloy elements are accurately added to adjust the composition; after the adjustment, the treated recycled aluminum melt is cast in the temperature range of 680-720℃ to produce recycled aluminum products.

9. The use of a high-efficiency composite component flux for recycled aluminum according to claim 8, characterized in that: In step a, the drying temperature is set at 150-300°C and the drying time is 40-50min. In step b, the temperature is raised to 300-400°C at a heating rate of 10-15°C / min for preheating for 30-40min. The temperature is further raised to 750-850°C at a rate of 15-20°C / min.

10. The use of a high-efficiency composite component flux for recycled aluminum according to claim 8, characterized in that: The refining gas in step b is argon or nitrogen at 0.2-0.3m 3 / min flow into the smelting furnace.

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