Copper ingot produced from scrap copper and preparation method

Abstract

The invention relates to the technical field of copper ingots, and particularly discloses a copper ingot produced from scrap copper and a preparation method. The invention discloses a copper ingot produced from scrap copper. The copper ingot is prepared from the following raw material components in parts by weight: 65 to 75 parts of waste red copper, 20 to 30 parts of crushed copper, 1 to 5 parts of iron-removed copper powder, 0.175 to 0.185 part of titanium diboride, 0.048 to 0.052 part of rare earth stabilizer powder, 0.019 to 0.021 part of strontium-aluminum alloy, 0.115 to 0.125 part of refining agent and 0.077 to 0.083 part of nano silicon carbide. Titanium diboride and rare earth stabilizer powder can be synergistically refined, strontium-aluminum alloy can inhibit dendritic crystal growth, a refining agent and nano silicon carbide can achieve an environment-friendly synergistic effect, the quality of the obtained copper ingot is improved, therefore, surface pores of the obtained copper ingot are reduced, and the grain size of the copper ingot is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of copper ingots, and in particular to a copper ingot produced from scrap copper and a preparation method thereof. Background Art

[0002] With the advancement of the urbanization process in China and the rapid development of the real estate market, China's sanitary ware market has also developed rapidly. According to statistics from relevant national departments, the copper ingots used for producing sanitary ware valves increase at a rate of more than 20% annually, and the demand for ordinary sanitary ware products will be even greater. The current sanitary ware products are mainly plumbing components, and such products have extremely high requirements for performance such as surface quality, strength, and toughness. Therefore, it is required that the copper ingot alloy base used also has good organizational structure and mechanical properties. In the commonly used method of producing copper ingots from scrap copper, the obtained copper ingots have more surface pores and a large average grain size, thus affecting the strength and toughness of the products prepared therefrom and making it difficult to meet the requirements of sanitary ware products. Summary of the Invention

[0003] In order to reduce the surface pores of copper ingots and reduce the grain size, the present application provides a copper ingot produced from scrap copper and a preparation method thereof.

[0004] In a first aspect, a copper ingot produced from scrap copper provided by the present application adopts the following technical solution: A copper ingot produced from scrap copper, the raw materials of the copper ingot comprising the following components in parts by weight: 65 - 75 parts of scrap red copper, 20 - 30 parts of crushed copper, 1 - 5 parts of iron-removed copper powder, 0.175 - 0.185 parts of titanium diboride, 0.048 - 0.052 parts of rare earth stabilizer powder, 0.019 - 0.021 parts of strontium aluminum alloy, 0.115 - 0.125 parts of refining agent, 0.077 - 0.083 parts of nano silicon carbide.

[0005] By adopting the above technical solution, titanium diboride, as the core grain refiner, can refine grains, and the rare earth stabilizer powder plays an auxiliary role in refining grains and can also purify the melt during the preparation process. Therefore, titanium diboride and the rare earth stabilizer powder can synergistically refine grains. The strontium aluminum alloy can inhibit dendrite growth, and the refining agent and nano silicon carbide can play an environmental protection synergistic effect, improving the quality of the obtained copper ingot. Therefore, the surface pores of the obtained copper ingot are reduced, and its grain size is decreased.

[0006] In a specific feasible embodiment, the rare earth stabilizer powder comprises a mixture of yttrium oxide and cerium dioxide.

[0007] By adopting the above technical solution, using the composite rare earth stabilizer powder composed of yttrium oxide and cerium dioxide can reduce the viscosity of the melt, improve the casting fluidity, and further refine the grain size.

[0008] In a specific feasible implementation, the refining agent includes a mixture composed of lithium carbonate and boron oxide.

[0009] By adopting the above technical solution, using the composite refining agent composed of lithium carbonate and boron oxide can significantly improve the melt purification efficiency and metallurgical quality.

[0010] In a second aspect, a preparation method of a copper ingot produced from scrap copper provided by the present application adopts the following technical solution: A preparation method of a copper ingot produced from scrap copper includes the following steps: Impurity removal: First, use a permanent magnet drum separator to remove iron from waste purple copper, crushed copper, and iron-removed copper powder to obtain raw materials, and then perform supercritical cleaning on the raw materials to obtain clean materials; Activation: First, spray a layer of copper peroxide on the surface of the clean material, and then perform microwave activation to obtain activated materials; Melting: Pre-melt the activated materials, strontium aluminum alloy, rare earth stabilizer powder, and nano-silicon carbide at 975 - 985 °C, then add a refining agent and refine at 1215 - 1225 °C, and finally add titanium diboride and perform refinement and modification at 1147 - 1153 °C to obtain molten materials; Dynamic refining: First, perform rotary spraying, ultrasonic treatment, and cyclic filtration on the molten materials in sequence to obtain dynamic materials; Cooling: First, perform primary cooling on the dynamic materials using high-pressure helium atomization, then perform secondary cooling using liquid nitrogen spraying, and finally add them to a water-cooled copper mold for water cooling to obtain rough products; Casting: First, add the rough products to a pulsed magnetic field for crystal inhibition, and then perform embryo drawing and casting to obtain copper ingots.

[0011] By adopting the above technical solution, first remove impurities from the raw materials of waste purple copper, crushed copper, and iron-removed copper powder to obtain clean materials, and then perform activation, melting, dynamic refining, cooling, and casting on the clean materials to obtain copper ingots with small surface pores and small grain sizes.

[0012] In a specific feasible implementation, in the impurity removal step, first use a permanent magnet drum separator to remove iron from waste purple copper, crushed copper, and iron-removed copper powder to obtain raw materials with an iron content less than or equal to 0.003%.

[0013] In a specific feasible implementation, the activation step is: First, spray a layer of copper peroxide with a thickness of 15 - 25 nm on the surface of the clean material, and then perform microwave activation for 5 min at 300 °C and 2450 MHz under the protection of nitrogen to obtain activated materials.

[0014] In a specific feasible implementation, in the dynamic refining step, a ceramic filter with a pore size of 0.5 mm is used for cyclic filtration.

[0015] In a specific feasible implementation, the casting step is as follows: first, add the crude product into a magnetic field with a frequency of 5 Hz and an intensity of 1.5 T for pulsed crystal inhibition, then draw the billet, and finally cast at 1115 - 1125 °C to obtain a copper ingot.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the present application, titanium diboride as the core grain refiner can refine the grains, and the rare earth stabilizer powder plays an auxiliary role in refining the grains and can also purify the melt during the preparation process. Therefore, titanium diboride and the rare earth stabilizer powder can synergistically refine, and strontium aluminum alloy can inhibit dendrite growth. The refining agent and nano-silicon carbide can play an environmental protection synergistic effect to improve the quality of the obtained copper ingot. Therefore, the surface pores of the obtained copper ingot are reduced, and its grain size is decreased. 2. In the present application, the composite rare earth stabilizer powder composed of yttrium oxide and cerium dioxide can reduce the viscosity of the melt, improve the casting fluidity, and further refine the grain size. 3. In the method of the present application, first, impurities are removed from the raw materials of waste purple copper, broken copper, and iron-removed copper powder to obtain clean materials, and then the clean materials are activated, melted, dynamically refined, cooled, and cast to obtain a copper ingot with small surface pores and small grain size. Specific Embodiments

[0017] The following further elaborates on the present application with reference to the embodiments.

[0018] All raw materials in the embodiments can be obtained commercially. Among them, the strontium aluminum alloy is provided by Zhongke Yannuo, and the product number is BM11093. Embodiments

[0019] Embodiment 1 Embodiment 1 provides a method for preparing a copper ingot produced from waste copper.

[0020] A method for preparing a copper ingot produced from waste copper includes the following steps: Impurity removal: First, use a permanent magnetic drum separator to remove iron from 650 kg of waste purple copper, 200 kg of broken copper, and 10 kg of iron-removed copper powder to obtain raw materials with an iron content less than or equal to 0.003%, and then perform supercritical cleaning on the raw materials to obtain clean materials; Activation: First, spray a layer of copper peroxide with a thickness of 15 nm on the surface of the clean materials, and then perform microwave activation for 5 min at 300 °C and 2450 MHz under the protection of nitrogen to obtain activated materials; Smelting: Pre-melt the activated material, 0.19 kg of strontium-aluminum alloy, 0.48 kg of rare-earth stabilizer powder, and 0.77 kg of nano-silicon carbide at 975 °C for 50 min. Then add 1.15 kg of refining agent and refine at 1215 °C for 45 min. Finally, add 1.75 kg of titanium diboride and carry out grain refinement and modification at 1147 °C for 15 min to obtain the smelted material. The rare-earth stabilizer powder is a mixture of yttrium oxide and cerium dioxide, and the weight ratio of yttrium oxide to cerium dioxide is 3:1. The refining agent is a mixture of lithium carbonate and boron oxide, and the weight ratio of lithium carbonate to boron oxide is 4:1. Dynamic refining: First, use a graphite rotor to carry out rotary injection on the smelted material. When injecting, control the argon gas flow rate at 10 L / min and the rotation speed at 150 rpm. Then, carry out ultrasonic treatment for 30 min under the conditions of 20 kHz and a power density of 8 W / cm 2 . Finally, carry out cyclic filtration using a ceramic filter with a pore size of 0.5 mm to obtain the dynamic material. Cooling: First, carry out primary cooling on the dynamic material using high-pressure helium gas atomization, with a pressure of 0.8 MPa and a flow rate of 15 m 3 / h. Then, carry out secondary cooling using liquid nitrogen injection, with a temperature of -196 °C and a contact time of 1 s. Finally, add it to a water-cooled copper mold and carry out water cooling under the conditions of a water temperature of 20 °C and a flow rate of 3 m / s to obtain the crude product. Casting: First, add the crude product to a magnetic field with a frequency of 5 Hz and a strength of 1.5 T for pulse crystal inhibition, then draw the billet, and finally carry out casting at 1115 °C to obtain the copper ingot.

[0021] Example 2 Example 2 provides a method for preparing a copper ingot produced from waste and miscellaneous copper.

[0022] A method for preparing a copper ingot produced from waste and miscellaneous copper includes the following steps: Impurity removal: First, use a permanent magnet drum separator to remove iron from 700 kg of waste purple copper, 250 kg of crushed copper, and 30 kg of iron-removed copper powder to obtain a raw material with an iron content less than or equal to 0.003%. Then, carry out supercritical cleaning on the raw material to obtain the clean material. Activation: First, spray a layer of copper peroxide with a thickness of 15 nm on the surface of the clean material. Then, under the protection of nitrogen and at 300 °C and 2450 MHz, carry out microwave activation for 5 min to obtain the activated material. Smelting: Pre-melt the activated material, 0.20 kg of strontium-aluminum alloy, 0.5 kg of rare-earth stabilizer powder, and 0.8 kg of nano-silicon carbide at 975 °C for 50 min. Then add 1.2 kg of refining agent and refine at 1215 °C for 45 min. Finally, add 1.8 kg of titanium diboride and carry out grain refinement and modification at 1147 °C for 15 min to obtain the smelted material. The rare-earth stabilizer powder is a mixture of yttrium oxide and cerium dioxide, and the weight ratio of yttrium oxide to cerium dioxide is 3:1. The refining agent is a mixture of lithium carbonate and boron oxide, and the weight ratio of lithium carbonate to boron oxide is 4:1. Dynamic refining: First, use a graphite rotor to carry out rotary injection on the smelted material. When injecting, control the argon gas flow rate to be 10 L / min and the rotation speed to be 150 rpm. Then, carry out ultrasonic treatment for 30 min under the conditions of 20 kHz and a power density of 8 W / cm 2 . Finally, carry out cyclic filtration using a ceramic filter with a pore size of 0.5 mm to obtain the dynamic material. Cooling: First, carry out primary cooling on the dynamic material using high-pressure helium atomization, with a pressure of 0.8 MPa and a flow rate of 15 m 3 / h. Then, carry out secondary cooling using liquid nitrogen injection, with a temperature of -196 °C and a contact time of 1 s. Finally, add it to a water-cooled copper mold and carry out water cooling under the conditions of a water temperature of 20 °C and a flow rate of 3 m / s to obtain the crude product. Casting: First, add the crude product to a magnetic field with a frequency of 5 Hz and an intensity of 1.5 T for pulse crystal inhibition, then draw the billet, and finally carry out casting at 1115 °C to obtain the copper ingot.

[0023] Example 3 Example 3 provides a method for preparing a copper ingot produced from waste and miscellaneous copper.

[0024] A method for preparing a copper ingot produced from waste and miscellaneous copper includes the following steps: Impurity removal: First, use a permanent magnet drum separator to remove iron from 750 kg of waste purple copper, 300 kg of crushed copper, and 50 kg of iron-removed copper powder to obtain a raw material with an iron content less than or equal to 0.003%. Then, carry out supercritical cleaning on the raw material to obtain the clean material. Activation: First, spray a layer of copper peroxide with a thickness of 15 nm on the surface of the clean material. Then, under the protection of nitrogen and at 300 °C and 2450 MHz, carry out microwave activation for 5 min to obtain the activated material. Smelting: The activated material, 0.21 kg of strontium-aluminum alloy, 0.52 kg of rare-earth stabilizer powder, and 0.83 kg of nano-silicon carbide are pre-melted at 975°C for 50 min. Then, 1.25 kg of refining agent is added, and refining is carried out at 1215°C for 45 min. Finally, 1.75 kg of titanium diboride is added, and grain refinement and modification are carried out at 1147°C for 15 min to obtain the smelted material. The rare-earth stabilizer powder is a mixture of yttrium oxide and cerium dioxide, and the weight ratio of yttrium oxide to cerium dioxide is 3:1. The refining agent is a mixture of lithium carbonate and boron oxide, and the weight ratio of lithium carbonate to boron oxide is 4:1. Dynamic refining: First, the smelted material is subjected to rotary injection using a graphite rotor. During injection, the argon gas flow rate is controlled at 10 L / min and the rotation speed is 150 rpm. Then, ultrasonic treatment is carried out for 30 min under the conditions of 20 kHz and a power density of 8 W / cm 2 . Finally, circular filtration is carried out using a ceramic filter with a pore size of 0.5 mm to obtain the dynamic material. Cooling: First, the dynamic material is subjected to primary cooling by high-pressure helium atomization, with a pressure of 0.8 MPa and a flow rate of 15 m 3 / h. Then, secondary cooling is carried out by liquid nitrogen injection, with a temperature of -196°C and a contact time of 1 s. Finally, it is added to a water-cooled copper mold and water-cooled under the conditions of a water temperature of 20°C and a flow rate of 3 m / s to obtain the crude product. Casting: First, the crude product is added to a magnetic field with a frequency of 5 Hz and a strength of 1.5 T for pulsed crystal inhibition, then the billet is drawn, and finally casting is carried out at 1115°C to obtain the copper ingot.

[0025] Example 4 Example 4 provides a method for preparing a copper ingot produced from waste and miscellaneous copper.

[0026] A method for preparing a copper ingot produced from waste and miscellaneous copper includes the following steps: Impurity removal: First, a permanent magnetic drum separator is used to remove iron from 700 kg of waste purple copper, 250 kg of crushed copper, and 30 kg of iron-removed copper powder to obtain a raw material with an iron content less than or equal to 0.003%. Then, the raw material is subjected to supercritical cleaning to obtain the clean material. Activation: First, a layer of copper peroxide with a thickness of 20 nm is sprayed on the surface of the clean material. Then, under the protection of nitrogen and at 300°C and 2450 MHz, microwave activation is carried out for 5 min to obtain the activated material. Smelting: The activated material, 0.20 kg of strontium aluminum alloy, 0.5 kg of rare earth stabilizer powder, and 0.8 kg of nano silicon carbide are pre-melted at 980 °C for 50 min. Then, 1.2 kg of refining agent is added, and refining is carried out at 1220 °C for 45 min. Finally, 1.8 kg of titanium diboride is added, and grain refinement and modification are carried out at 1150 °C for 15 min to obtain the smelted material. The rare earth stabilizer powder is a mixture of yttrium oxide and cerium dioxide, and the weight ratio of yttrium oxide to cerium dioxide is 3:1. The refining agent is a mixture of lithium carbonate and boron oxide, and the weight ratio of lithium carbonate to boron oxide is 4:1. Dynamic refining: First, the smelted material is subjected to rotary injection using a graphite rotor. During injection, the argon gas flow rate is controlled at 10 L / min, and the rotation speed is 150 rpm. Then, ultrasonic treatment is carried out for 30 min under the conditions of 20 kHz and a power density of 8 W / cm 2 . Finally, circulation filtration is carried out using a ceramic filter with a pore size of 0.5 mm to obtain the dynamic material. Cooling: First, the dynamic material is subjected to primary cooling by high-pressure helium atomization, with a pressure of 0.8 MPa and a flow rate of 15 m 3 / h. Then, secondary cooling is carried out by liquid nitrogen injection, with a temperature of -196 °C and a contact time of 1 s. Finally, it is added to a water-cooled copper mold, and water cooling is carried out under the conditions of a water temperature of 20 °C and a flow rate of 3 m / s to obtain the crude product. Casting: First, the crude product is added to a magnetic field with a frequency of 5 Hz and a strength of 1.5 T for pulse crystal inhibition, then the billet is drawn, and finally casting is carried out at 1120 °C to obtain the copper ingot.

[0027] Example 5 Example 5 provides a method for preparing a copper ingot produced from waste and miscellaneous copper.

[0028] A method for preparing a copper ingot produced from waste and miscellaneous copper includes the following steps: Impurity removal: First, a permanent magnetic drum separator is used to remove iron from 700 kg of waste purple copper, 250 kg of crushed copper, and 30 kg of iron-removed copper powder to obtain a raw material with an iron content less than or equal to 0.003%. Then, the raw material is subjected to supercritical cleaning to obtain the clean material. Activation: First, a layer of copper peroxide with a thickness of 25 nm is sprayed on the surface of the clean material. Then, under the protection of nitrogen and at 300 °C and 2450 MHz, microwave activation is carried out for 5 min to obtain the activated material. Smelting: The activated material, 0.20 kg of strontium-aluminum alloy, 0.5 kg of rare earth stabilizer powder, and 0.8 kg of nano silicon carbide were pre-melted at 985 °C for 50 min. Then, 1.2 kg of refining agent was added and refined at 1225 °C for 45 min. Finally, 1.8 kg of titanium diboride was added and refined and modified at 1153 °C for 15 min to obtain the smelted material. The rare earth stabilizer powder is a mixture of yttrium oxide and cerium dioxide, and the weight ratio of yttrium oxide to cerium dioxide is 3:1. The refining agent is a mixture of lithium carbonate and boron oxide, and the weight ratio of lithium carbonate to boron oxide is 4:1. Dynamic refining: First, the smelted material was rotationally sprayed using a graphite rotor. During spraying, the argon gas flow rate was controlled at 10 L / min and the rotation speed was 150 rpm. Then, ultrasonic treatment was carried out for 30 min under the conditions of 20 kHz and a power density of 8 W / cm 2 . Finally, circular filtration was carried out using a ceramic filter with a pore size of 0.5 mm to obtain the dynamic material; Cooling: First, the dynamic material was first cooled using high-pressure helium atomization at a pressure of 0.8 MPa and a flow rate of 15 m 3 / h. Then, secondary cooling was carried out using liquid nitrogen injection at a temperature of -196 °C and a contact time of 1 s. Finally, it was added to a water-cooled copper mold and water-cooled under the conditions of a water temperature of 20 °C and a flow rate of 3 m / s to obtain the crude product; Casting: First, the crude product was added to a magnetic field with a frequency of 5 Hz and a strength of 1.5 T for pulsed crystal inhibition, then the billet was drawn, and finally casting was carried out at 1125 °C to obtain the copper ingot.

[0029] Example 6 The difference between Example 6 and Example 4 is that the rare earth stabilizer powder is yttrium oxide; the remaining steps are the same as those in Example 4.

[0030] Example 7 The difference between Example 7 and Example 4 is that the rare earth stabilizer powder is cerium dioxide; the remaining steps are the same as those in Example 4.

[0031] Example 8 The difference between Example 8 and Example 4 is that the refining agent is lithium carbonate; the remaining steps are the same as those in Example 4.

[0032] Example 9 The difference between Example 9 and Example 4 is that the refining agent is boron oxide; the remaining steps are the same as those in Example 4.

[0033] Comparative example Comparative example 1 The difference between Comparative Example 1 and Example 1 lies in smelting: pre-melting the activated material, 0.19 kg of strontium-aluminum alloy, and 0.77 kg of nano-silicon carbide at 975 °C for 50 min, then adding 1.15 kg of refining agent, and refining at 1215 °C for 45 min to obtain the smelted material; the refining agent is a mixture composed of lithium carbonate and boron oxide, and the weight ratio of lithium carbonate to boron oxide is 4:1; the remaining steps are the same as those in Example 4.

[0034] Comparative Example 2 The difference between Comparative Example 2 and Example 1 lies in smelting: pre-melting the activated material and 0.48 kg of rare earth stabilizer powder at 975 °C for 50 min, then adding 1.15 kg of refining agent, refining at 1215 °C for 45 min, and finally adding 1.75 kg of titanium diboride and performing grain refinement and modification at 1147 °C for 15 min to obtain the smelted material; the rare earth stabilizer powder is a mixture composed of yttrium oxide and cerium dioxide, and the weight ratio of yttrium oxide to cerium dioxide is 3:1; the refining agent is a mixture composed of lithium carbonate and boron oxide, and the weight ratio of lithium carbonate to boron oxide is 4:1; the remaining steps are the same as those in Example 4.

[0035] Performance detection test - number of pores: Macroscopic metallographic inspection was carried out on the copper ingots in each example and comparative example to obtain the number of pores.

[0036] Grain size: Detection was carried out in accordance with GB / T6394-2017 "Method for Determining Average Grain Size of Metals" to obtain the average grain diameter.

[0037] Table 1 Performance detection results of copper ingots Sample Number of pores Average grain diameter (μm) Example 1 3 26 Example 2 2 25 Example 3 2 25 Example 4 2 22 Example 5 2 24 Example 6 2 24 Example 7 3 25 Example 8 4 24 Example 9 5 25 Comparative Example 1 3 58 Comparative Example 2 7 28 Combining Example 1 and Comparative Examples 1-2, the copper ingot in Example 1 has fewer pores and a smaller average grain diameter. It can be seen that when preparing the smelted material, adding titanium diboride, rare earth stabilizer powder, strontium-aluminum alloy, and nano-silicon carbide to the raw materials, titanium diboride can refine the grains, and the rare earth stabilizer powder plays an auxiliary role in refining the grains. Therefore, by using the synergistic refining effect of titanium diboride and rare earth stabilizer powder, the average grain diameter of the copper ingot is reduced. Strontium-aluminum alloy can inhibit dendrite growth, and the refining agent and nano-silicon carbide can play an environmental synergistic effect, improving the quality of the obtained copper ingot, reducing the surface pores of the copper ingot, resulting in fewer pores and a smaller average grain diameter of the obtained copper ingot.

[0038] Combining Examples 1-3, it can be seen that when preparing the smelted material, according to the raw material formulation in Examples 1-3, the quality of the obtained copper ingot is better.

[0039] Combining Example 2, Example 4, and Example 5, the average grain diameter of the copper ingot in Example 4 is the smallest. It can be seen that when preparing the copper ingot, the preparation conditions in Example 4 are the best.

[0040] Combined with Example 4, Example 6 and Example 7, the quality of the copper ingot in Example 4 is the best. It can be seen that when preparing the melting charge, the rare earth stabilizer powder is preferably a mixture composed of yttrium oxide and cerium dioxide. By using the composite rare earth stabilizer powder composed of yttrium oxide and cerium dioxide, the viscosity of the melt can be reduced, the casting fluidity can be improved, and the grain size can be further refined.

[0041] Combined with Example 4, Example 8 and Example 9, the quality of the copper ingot in Example 4 is the best. It can be seen that when preparing the melting charge, the refining agent is preferably a mixture composed of lithium carbonate and boron oxide, which can further improve the quality of the obtained copper ingot.

[0042] This specific embodiment is only an interpretation of the present application, and it does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A copper ingot produced from scrap copper, characterized in that: The raw materials of the copper ingot include the following components in parts by weight: 65-75 parts of waste copper, 20-30 parts of crushed copper, 1-5 parts of iron-removing copper powder, 0.175-0.185 parts of titanium diboride, 0.048-0.052 parts of rare earth stabilizer powder, 0.019-0.021 parts of strontium aluminum alloy, 0.115-0.125 parts of refining agent, and 0.077-0.083 parts of nano-silicon carbide.

2. The copper ingot produced from scrap copper according to claim 1, characterized in that: The rare earth stabilizer powder comprises a mixture of yttrium oxide and cerium dioxide.

3. The copper ingot produced from scrap copper according to claim 1, characterized in that: The refining agent comprises a mixture of lithium carbonate and boron oxide.

4. A method for preparing a copper ingot produced from scrap copper as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: Impurity removal: First, use a permanent magnetic drum separator to remove iron from waste copper, crushed copper, and iron-removing copper powder to obtain raw materials, and then perform supercritical cleaning on the raw materials to obtain clean materials; Activation: First, spray a layer of copper peroxide on the surface of the clean material, and then perform microwave activation to obtain the activated material; Melting: pre-melt the activated material, strontium aluminum alloy, rare earth stabilizer powder and nano silicon carbide at 975-985°C, then add the refining agent, refine at 1215-1225°C, and finally add titanium diboride, refine and modify at 1147-1153°C to obtain the smelting material; Dynamic refining: firstly, the smelting material is subjected to rotary blowing, ultrasonic treatment, and circulation filtration in sequence to obtain dynamic material; Cooling: First, the dynamic material is cooled by high-pressure helium atomization, then cooled by liquid nitrogen spray, and finally added to a water-cooled copper mold for water cooling to obtain a crude product; Casting: First, the crude product is added into a pulsed magnetic field to suppress the crystal, and then the embryo is pulled and cast to obtain a copper ingot.

5. The method for preparing copper ingots produced from scrap copper according to claim 4, characterized in that: In the impurity removal step, the waste copper, crushed copper and iron-removing copper powder are firstly removed by a permanent magnetic drum separator to obtain a raw material with an iron content of less than or equal to 0.003%.

6. The method for preparing copper ingots produced from scrap copper according to claim 6, characterized in that: The activation step is: first spray a layer of copper peroxide with a thickness of 15-25nm on the surface of the clean material, then perform microwave activation for 5 minutes at 300°C and 2450MHz under the protection of nitrogen to obtain an activated material.

7. The method for preparing copper ingots produced from scrap copper according to claim 6, characterized in that: In the dynamic refining step, a ceramic filter with a pore size of 0.5 mm is used for circulation filtration.

8. The method for preparing copper ingots produced from scrap copper according to claim 7, characterized in that: The casting steps are: firstly, the crude product is added into a magnetic field with a frequency of 5 Hz and an intensity of 1.5 T for pulse crystal suppression, then the embryo is pulled, and finally, the copper ingot is cast at 1115-1125° C. to obtain the copper ingot.