A method for preparing aluminum-silicon alloy by synergistically treating copper slag through alumina electrolysis

Abstract

The present invention provides a method for co-processing copper slag by alumina electrolysis to prepare aluminum-silicon alloy, which is characterized by comprising the following steps: S1. Crushing and grinding the copper slag to be treated to obtain crushed copper slag; S2. Adding cryolite-based electrolyte into the electrolytic cell and heating it to the molten state to form cryolite-based molten salt; S3. Adding the crushed copper slag into the electrolytic cell, adjusting the voltage for electrolysis, and obtaining iron through a vacuum ladle; S4. Adding alumina into the electrolytic cell, adjusting the voltage for electrolysis, and obtaining aluminum-silicon alloy through a vacuum ladle; wherein, the content of iron in the copper slag to be treated is 35wt% - 41wt%, the content of silicon is 11wt% - 17wt%, the content of aluminum is 1.2wt% - 2.5wt%, the content of copper is 0.5wt% - 1.2wt%, and the superheat degree of the cryolite-based molten salt during electrolysis is 5 - 15°C. The present invention adopts the molten salt electrolysis method to treat and recover metals such as iron, aluminum, and silicon in lean copper slag, and the recovered products have high purity, the process flow is simple and there is no secondary pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of copper slag recycling and reuse, and specifically relates to a method for co-processing copper slag by alumina electrolysis to prepare aluminum-silicon alloy. Background Art

[0002] Copper slag is a smelting tailing produced during the pyrometallurgical smelting of copper sulfide concentrate. It contains many recoverable metal elements such as Fe, Si, Al, Ca, etc., and also harmful elements such as S and As that are harmful to the environment and human health. The main phases are fayalite (2FeO·SiO2) and magnetite (Fe3O4). With the increase in copper production, the amount of copper slag is increasing day by day. In 2019, the refined copper output in China was 9.784 million tons. Calculated according to the ratio of 2.2 tons of copper slag produced per 1 ton of refined copper, the copper slag emissions in China in 2019 reached as high as 21.5248 million tons. The long-term stacking of a large amount of copper slag will not only seriously pollute the environment and affect human health, but also waste a large amount of metal resources in it. Therefore, it is very necessary to treat and recycle copper slag.

[0003] At present, the resource recycling and utilization of copper slag mainly include: recovering valuable metals, building roads and engineering, catalysts and modifiers, cement industry, etc. There are many methods for recovering Fe, Cu, etc., such as beneficiation method, reduction roasting-magnetic separation method, oxidation roasting-magnetic separation, wet treatment and recovery, etc. However, these recoveries of copper slag resources basically adopt traditional metal recovery processes, and the processes generally have disadvantages such as high cost and generation of secondary waste slag and waste liquid.

[0004] Therefore, it is necessary to design a new method for copper slag recovery and treatment to overcome the above problems. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, and provides a method for co-processing copper slag by alumina electrolysis to prepare aluminum-silicon alloy. The molten salt electrolysis method is adopted, and the purity of the recovered product is high, the process flow is simple and there is no secondary pollution.

[0006] The present invention is implemented as follows:

[0007] The present invention provides a method for co-processing copper slag by alumina electrolysis to prepare aluminum-silicon alloy, including the following steps:

[0008] S1. Crush and grind the copper slag to be treated to obtain crushed copper slag;

[0009] S2. Add cryolite-based electrolyte into the electrolytic cell and heat it to the molten state to form cryolite-based molten salt;

[0010] S3. Add the crushed copper slag into the electrolytic cell, adjust the voltage for electrolysis, and obtain iron through a vacuum ladle;

[0011] S4. Add alumina into the electrolytic cell, adjust the voltage for electrolysis, and obtain aluminum-silicon alloy through a vacuum ladle.

[0012] Among them, the content of iron in the copper slag to be treated is 35wt% - 41wt%, the content of silicon is 11wt% - 17wt%, the content of aluminum is 1.2wt% - 2.5wt%, the content of copper is 0.5wt% - 1.2wt%, and the superheat degree of the cryolite-based molten salt during electrolysis is 5 - 15°C.

[0013] First of all, in the process of recycling copper slag, this method can not only recover iron, aluminum, and silicon elements from copper slag to prepare aluminum-silicon alloy and iron, but also recycle the electrolyte components therein to reduce the electrolysis cost, realizing the harmlessness and resource utilization of copper slag; secondly, this method adjusts the electrolysis voltage and the feeding order of materials in a flexible way to successfully separate iron and silicon elements in copper slag and produce iron and aluminum-silicon alloy with higher purity.

[0014] In the present invention, the copper content in the copper slag is low, so it is a poor copper slag. In the whole process, the poor copper slag is used as the treatment raw material, and the copper slag is treated by the molten salt electrolysis method. An aluminum electrolytic cell is used, and during the electrolysis of aluminum, the feeding order of copper slag and alumina and the level of electrolysis voltage are adjusted to control the generation order of electrolysis products, so as to smoothly separate iron and silicon-aluminum elements in the copper slag.

[0015] Furthermore, the average particle size of the crushed copper slag and alumina is not more than 200 mesh.

[0016] Furthermore, the cryolite-based electrolyte includes 2 - 5wt% of magnesium fluoride, 2 - 3wt% of lithium fluoride, 2 - 6wt% of calcium fluoride, 2 - 5wt% of potassium fluoride, 2 - 5wt% of alumina, 3 - 7wt% of aluminum fluoride, and the balance of cryolite.

[0017] Furthermore, the melting temperature of the cryolite-based electrolyte is 950 - 980°C.

[0018] Furthermore, the molecular ratio of the cryolite is 2.2 - 2.8.

[0019] Furthermore, the mass ratio of the crushed copper slag to the cryolite-based electrolyte is 1:4 - 5.8.

[0020] Furthermore, the mass ratio of alumina to the crushed copper slag is 1:1 - 2.

[0021] Furthermore, the electrolysis voltage in step S3 is 2.8 - 3.2V, and the electrolysis voltage in step S4 is 3.5 - 4.2V.

[0022] Further, when the mass ratio of the added alumina to the crushed copper slag is 1:1, the silicon content in the aluminum-silicon alloy is 7% - 14%; when the mass ratio of the added alumina to the crushed copper slag is 1:2, the silicon content in the aluminum-silicon alloy is 18% - 25%.

[0023] The present invention has the following beneficial effects:

[0024] 1. The present invention utilizes an aluminum electrolysis cell to treat copper slag while electrolyzing aluminum to prepare aluminum-silicon alloy and iron. Using the molten salt electrolysis method, compared with other heat treatment recovery methods, it requires a lower temperature and a shorter process flow. Moreover, the copper slag contains alumina, which can reduce the addition of alumina raw materials, and the overall process cost is low;

[0025] 2. The present invention can successfully recover the iron, silicon, and aluminum elements with the largest proportion in the copper slag. The magnesium, calcium, etc. originally belonging to trace elements in the electrolyte in the copper slag do not require any treatment and can be recycled in the electrolysis cell. The harmful elements can be melted in the electrolyte without generating secondary pollution, realizing the harmlessness and resource utilization of solid waste;

[0026] 3. According to the different electrolysis voltages of iron oxide, alumina, and silicon oxide, the present invention flexibly adjusts the electrolysis voltage and the order of material addition to achieve the purpose of electrolytic precipitation of iron and silicon at different time periods. Therefore, the electrolyzed iron and aluminum-silicon alloy have less impurities and high quality, and can successfully solve the problems that it is difficult to separate iron and silicon elements in copper slag, and the quality of iron and silicon after separation is not high and the recovery rate is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the preparation process for preparing iron and aluminum-silicon alloy by synergistically disposing copper slag through alumina electrolysis in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] Embodiments of the present invention all utilize the old electrolytic cells in the aluminum electrolysis plant as the electrolytic reaction cells. First, the copper slag is detected by XRF and XRD. Affected by raw materials, smelting processes, and additives, the chemical compositions of different copper slags have certain differences. Specifically, the iron content in the copper slag of the present invention is 35wt% - 41wt%, the silicon content is 11wt% - 17wt%, the aluminum content is 1.2wt% - 2.5wt%, and the copper content is 0.5wt% - 1.2wt%. After analysis, the iron content in the copper slag accounts for the largest proportion, followed by the silicon element content, and the copper content is relatively small, only 0.5wt% - 1.2wt%. The main phases in the copper slag are fayalite and magnetite, so it is relatively difficult to separate iron and silicon elements.

[0031] As Figure 1 shown, the specific steps of the present invention include:

[0032] Step 1: Put the copper slag to be processed into a ball mill for pulverization, and ball mill until the particle size of the copper slag is less than 200 mesh to obtain pulverized copper slag;

[0033] Step 2: Add the cryolite-based electrolyte into the electrolytic cell and heat it to 950 - 980 °C and keep it warm to fully melt all the molten salts. Among them, the cryolite-based electrolyte includes 2 - 5wt% magnesium fluoride, 2 - 3wt% lithium fluoride, 2 - 6wt% calcium fluoride, 2 - 5wt% potassium fluoride, 2 - 5wt% alumina, 3 - 7wt% aluminum fluoride, and the balance of cryolite. The cryolite molecular ratio is 2.2 - 2.8, which refers to the ratio of NaF to AlF3. The superheat degree of the electrolyte for electrolysis is 5 - 15 °C;

[0034] Step 3: Add the pulverized copper slag into the electrolytic cell. The mass ratio of the copper slag to the cryolite-based electrolyte is 1:4 - 5.8. Turn on the motor for stirring, stir and mix fully and completely. After stirring ends, turn off the motor, connect the power supply for electrolysis, adjust the voltage to 2.8 - 3.2V, control the electrolytic voltage so that the iron in the pulverized copper slag is electrolyzed out, separate the iron and silicon in the pulverized copper slag, and finally obtain liquid iron at the bottom of the electrolytic cell. In order for the liquid iron not to affect the subsequent formation of aluminum-silicon alloy, the liquid iron needs to be sucked out of the electrolytic cell under negative pressure by a vacuum ladle. The vacuum ladle is an important equipment in the aluminum electrolysis smelting process. Its main function is to suck out the electrolytic aluminum liquid in the electrolytic cell and transport it to the mixing furnace. In the present invention, in order to prevent the high-temperature metal sucked out from cooling and solidifying, the vacuum ladle has a heat preservation structure;

[0035] Step 4: After sucking out the liquid iron from the electrolytic cell under negative pressure through a vacuum ladle, other elements such as silicon dioxide and alumina in the copper slag are dissolved in the cryolite-based electrolyte. Then, alumina raw materials with a particle size less than 200 mesh are added into the cryolite-based electrolyte, and the motor is started for stirring to fully mix the alumina and the cryolite-based electrolyte. After the stirring ends, the motor is turned off. The mass ratio of alumina to the crushed copper slag is 1:1 - 2. The power supply is connected for electrolysis, and the electrolysis voltage is adjusted to 3.5 - 4.2 V. The electrolysis voltage is controlled so that silicon dioxide and alumina in the electrolyte are electrolyzed. Since the electrolysis voltages of silicon dioxide and alumina are similar, liquid aluminum-silicon alloy electrolyzed can be obtained at the bottom of the electrolytic cell. Finally, the liquid aluminum-silicon alloy is sucked out of the electrolytic cell under negative pressure through a vacuum ladle.

[0036] Step 1 is to grind the copper slag to the average particle size of the alumina raw material. In Step 2, cryolite is used as a flux. The molten cryolite can dissolve alumina, enabling electrolysis to work at a temperature lower than the melting point of alumina, saving energy. The electrolyte maintains an appropriate superheat of 5 - 15 °C. One is to ensure a solidified electrolyte protection layer on the side, and the other is to ensure good solubility of alumina. Maintaining an appropriate electrolyte superheat can form a regular cell lining shape, and a good cell lining shape can stabilize production, reduce the horizontal current, and improve the current efficiency.

[0037] In Steps 3 and 4, according to the different electrolysis voltages of iron oxides, alumina, and silicon dioxide, the electrolysis voltage and the material addition sequence are flexibly adjusted to achieve the purpose of electrolytic precipitation of iron and silicon at different time periods. At the same time, during the electrolysis process, the copper slag not only contains a large proportion of iron, silicon, and aluminum elements, but also contains trace elements such as magnesium and calcium, as well as some harmful elements such as lead. These trace elements can be recycled as electrolytes in the electrolytic cell, and the harmful elements can also be melted in the electrolyte without causing secondary pollution. Not only are the iron, silicon, and aluminum elements with a large proportion in the copper slag successfully recovered, but also the harmlessness and resource utilization of solid waste are realized.

[0038] In the process of recycling copper slag by this method, iron, aluminum, and silicon elements are recovered from the copper slag to prepare aluminum-silicon alloy and iron, and the electrolyte components are recycled to reduce the electrolysis cost. The process flow is simple, and the purity of the recovered products is high.

[0039] The following is a detailed description through the following specific examples:

[0040] Example 1

[0041] The specific steps for using alumina to co-process copper slag to prepare aluminum-silicon alloy in this example are as follows:

[0042] S1. Put the copper slag into a ball mill and crush and grind it until the particle size is less than 200 mesh to obtain crushed copper slag. The iron content in the crushed copper slag is 35wt% - 41wt%, the silicon content is 11wt% - 17wt%, the aluminum content is 1.2wt% - 2.5wt%, and the copper content is 0.5wt% - 1.2wt%.

[0043] S2. Add an electrolyte, heat the electrolyte to 980 °C and keep it warm to fully melt all the molten salts to form a cryolite-based molten salt. Among them, the electrolyte is a cryolite-based electrolyte, including 2wt% magnesium fluoride, 2wt% lithium fluoride, 4wt% calcium fluoride, 2wt% potassium fluoride, 2wt% alumina, 6.5wt% aluminum fluoride, and the balance of cryolite. The cryolite molecular ratio is 2.5, and the superheat of the electrolyzed electrolyte is 15 °C.

[0044] S3. Add the crushed copper slag into the cryolite-based molten salt. The mass ratio of the added crushed copper slag to the cryolite-based electrolyte is 1:4. Stir to fully mix the crushed copper slag and the cryolite-based molten salt, adjust the electrolysis voltage to 3.2V for electrolysis, and finally obtain liquid iron at the bottom of the electrolytic cell. The liquid iron is sucked out of the electrolytic cell under negative pressure through a vacuum ladle to obtain liquid iron.

[0045] S4. Add alumina raw materials with an average particle size less than 200 mesh into the cryolite-based molten salt. The mass ratio of alumina to the added crushed copper slag is 1:1. Stir to fully mix the alumina and the cryolite-based molten salt, adjust the electrolysis voltage to 4.2V for electrolysis, so that silicon dioxide and alumina in the electrolyte are electrolyzed out. Liquid aluminum-silicon alloy can be obtained at the bottom of the electrolytic cell. Finally, the liquid aluminum-silicon alloy is sucked out of the electrolytic cell under negative pressure through a vacuum ladle to obtain liquid aluminum-silicon alloy. The silicon content in the aluminum-silicon alloy is 7% - 14%.

[0046] Example 2

[0047] The specific steps for preparing aluminum-silicon alloy by using alumina to co-treat copper slag in this example are as follows:

[0048] S1. Put the copper slag into a ball mill and crush and grind it until the particle size is less than 200 mesh to obtain crushed copper slag. The iron content in the crushed copper slag is 35wt% - 41wt%, the silicon content is 11wt% - 17wt%, the aluminum content is 1.2wt% - 2.5wt%, and the copper content is 0.5wt% - 1.2wt%.

[0049] S2. Add electrolyte, heat the electrolyte to 980 °C and hold the temperature to fully melt all the molten salts to form cryolite-based molten salts; the electrolyte is a cryolite-based electrolyte, including 2 wt% magnesium fluoride, 2 wt% lithium fluoride, 4 wt% calcium fluoride, 2 wt% potassium fluoride, 2 wt% alumina, 6.5 wt% aluminum fluoride and the balance cryolite. The cryolite molecular ratio is 2.5, and the superheat degree of the electrolyzed electrolyte is 15 °C;

[0050] S3. Add the pulverized copper slag into the cryolite-based molten salts. The mass ratio of the added pulverized copper slag to the cryolite-based electrolyte is 1:4. Stir to fully mix the pulverized copper slag and the cryolite-based molten salts, adjust the electrolysis voltage to 3.2 V for electrolysis, and finally obtain liquid iron at the bottom of the electrolytic cell. Use a vacuum ladle to suck out the liquid iron from the electrolytic cell under negative pressure to obtain liquid iron.

[0051] S4. Add alumina raw materials with an average particle size less than 200 mesh into the cryolite-based molten salts. The mass ratio of alumina to the added pulverized copper slag is 1:2. Stir to fully mix the alumina and the cryolite-based molten salts, adjust the electrolysis voltage to 4.2 V for electrolysis, so that silicon dioxide and alumina in the electrolyte are electrolyzed out. Liquid aluminum-silicon alloy can be obtained at the bottom of the electrolytic cell. Finally, use a vacuum ladle to suck out the liquid aluminum-silicon alloy from the electrolytic cell under negative pressure to obtain liquid aluminum-silicon alloy. The silicon content in the aluminum-silicon alloy is 18% - 25%.

[0052] Example 3

[0053] The specific steps for preparing aluminum-silicon alloy by using alumina to co-treat copper slag in this example are as follows:

[0054] S1. Put the copper slag into a ball mill and grind it to a particle size less than 200 mesh to obtain pulverized copper slag. The iron content in the pulverized copper slag is 35 wt% - 41 wt%, the silicon content is 11 wt% - 17 wt%, the aluminum content is 1.2 wt% - 2.5 wt%, and the copper content is 0.5 wt% - 1.2 wt%;

[0055] S2. Add electrolyte, heat the electrolyte to 980 °C and hold the temperature to fully melt all the molten salts to form cryolite-based molten salts; the electrolyte is a cryolite-based electrolyte, including 2 wt% magnesium fluoride, 2 wt% lithium fluoride, 4 wt% calcium fluoride, 2 wt% potassium fluoride, 2 wt% alumina, 6.5 wt% aluminum fluoride and the balance cryolite. The cryolite molecular ratio is 2.5, and the superheat degree of the electrolyzed electrolyte is 15 °C;

[0056] S3. Add the crushed copper slag into the cryolite-based molten salt. The mass ratio of the added crushed copper slag to the cryolite-based electrolyte is 1:5.8. Stir to fully mix the crushed copper slag and the cryolite-based molten salt. Adjust the electrolysis voltage to 2.8 V for electrolysis. Finally, liquid iron is obtained at the bottom of the electrolytic cell. The liquid iron is sucked out of the electrolytic cell under negative pressure by a vacuum ladle to obtain liquid iron.

[0057] S4. Add alumina raw materials with an average particle size less than 200 mesh into the cryolite-based molten salt. The mass ratio of alumina to the added crushed copper slag is 1:1. Stir to fully mix the alumina and the cryolite-based molten salt. Adjust the electrolysis voltage to 3.5 V for electrolysis, so that silicon dioxide and alumina in the electrolyte are electrolyzed out. Liquid aluminum-silicon alloy can be obtained at the bottom of the electrolytic cell. Finally, the liquid aluminum-silicon alloy is sucked out of the electrolytic cell under negative pressure by a vacuum ladle to obtain liquid aluminum-silicon alloy. The silicon content in the aluminum-silicon alloy is 7% - 14%.

[0058] Example 4

[0059] The specific steps for preparing aluminum-silicon alloy by using alumina to co-treat copper slag in this example are as follows:

[0060] S1. Put the copper slag into a ball mill and crush and grind it to a particle size less than 200 mesh to obtain crushed copper slag. The iron content in the crushed copper slag is 35wt% - 41wt%, the silicon content is 11wt% - 17wt%, the aluminum content is 1.2wt% - 2.5wt%, and the copper content is 0.5wt% - 1.2wt%.

[0061] S2. Add the electrolyte and heat the electrolyte to 980 °C and keep it warm to fully melt all the molten salts to form a cryolite-based molten salt. The electrolyte is a cryolite-based electrolyte, including 2wt% magnesium fluoride, 2wt% lithium fluoride, 4wt% calcium fluoride, 2wt% potassium fluoride, 2wt% alumina, 6.5wt% aluminum fluoride, and the balance cryolite. The cryolite molecular ratio is 2.5, and the electrolyte superheat degree for electrolysis is 15 °C.

[0062] S3. Add the crushed copper slag into the cryolite-based molten salt. The mass ratio of the added crushed copper slag to the cryolite-based electrolyte is 1:5.8. Stir to fully mix the crushed copper slag and the cryolite-based molten salt. Adjust the electrolysis voltage to 2.8 V for electrolysis. Finally, liquid iron is obtained at the bottom of the electrolytic cell. The liquid iron is sucked out of the electrolytic cell under negative pressure by a vacuum ladle to obtain liquid iron.

[0063] S4. Add alumina raw materials with an average particle size less than 200 mesh into the cryolite-based molten salt, where the mass ratio of alumina to the added crushed copper slag is 1:2. Stir to fully mix the alumina and the cryolite-based molten salt, adjust the electrolysis voltage to 3.5 V for electrolysis, so that silicon dioxide and alumina in the electrolyte are electrolyzed out. Liquid aluminum-silicon alloy can be obtained at the bottom of the electrolytic cell. Finally, the liquid aluminum-silicon alloy is sucked out of the electrolytic cell under negative pressure through a vacuum ladle to obtain the liquid aluminum-silicon alloy, and the silicon content in the aluminum-silicon alloy is 18% - 25%.

[0064] The present invention uses the molten salt electrolysis method. Compared with other heat treatment recovery methods, it requires a lower temperature and has a shorter process flow. Moreover, the copper slag contains alumina, which can reduce the addition of alumina raw materials and has a low cost. This method well realizes the electrolytic separation and recovery of silicon. It can not only prepare iron and aluminum-silicon alloys with stable chemical properties and high purity, recover most of the metal elements, but also reduce the recovery cost. The whole process flow is simple and there is no secondary pollution.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing aluminum-silicon alloy by co-processing copper slag with alumina electrolysis, characterized in that, It includes the following steps: S1. Crush and grind the copper slag to be treated to obtain crushed copper slag; S2. Add cryolite-based electrolyte into the electrolytic cell and heat it to the molten state to form cryolite-based molten salt; S3. Add the crushed copper slag into the electrolytic cell, adjust the voltage for electrolysis, and obtain iron through a vacuum ladle; S4. Add alumina into the electrolytic cell, adjust the voltage for electrolysis, and obtain aluminum-silicon alloy through a vacuum ladle; Wherein, the content of iron in the copper slag to be treated is 35wt% - 41wt%, the content of silicon is 11wt% - 17wt%, the content of aluminum is 1.2wt% - 2.5wt%, the content of copper is 0.5wt% - 1.2wt%, and the superheat degree of the cryolite-based molten salt during electrolysis is 5 - 15°C; The cryolite-based electrolyte includes 2 - 5wt% of magnesium fluoride, 2 - 3wt% of lithium fluoride, 2 - 6wt% of calcium fluoride, 2 - 5wt% of potassium fluoride, 2 - 5wt% of alumina, 3 - 7wt% of aluminum fluoride, and the balance of cryolite; The melting temperature of the cryolite-based electrolyte is 950 - 980°C; The molecular ratio of the cryolite is 2.2 - 2.8; The mass ratio of the crushed copper slag to the cryolite-based electrolyte is 1:4 - 5.8; The mass ratio of the alumina to the crushed copper slag is 1:1 - 2; The electrolysis voltage in step S3 is 2.8 - 3.2V, and the electrolysis voltage in step S4 is 3.5 - 4.2V.

2. The method for preparing aluminum-silicon alloy by co-processing copper slag with alumina electrolysis according to claim 1, characterized in that: The average particle size of the crushed copper slag and alumina is not greater than 200 mesh.

3. The method for preparing aluminum-silicon alloy by co-processing copper slag with alumina electrolysis as claimed in claim 1, wherein: When the mass ratio of the added alumina to the crushed copper slag is 1:1, the content of silicon in the aluminum-silicon alloy is 7% - 14%; when the mass ratio of the added alumina to the crushed copper slag is 1:2, the content of silicon in the aluminum-silicon alloy is 18% - 25%.

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