Preparation method of dispersion copper refining impurity removal agent

Abstract

The invention discloses a dispersion copper refining impurity removal agent. The dispersion copper refining impurity removal agent comprises the following raw materials according to a formula proportion: the raw materials comprise calcium oxide, calcium fluoride, magnesium oxide, high-purity magnesia and white corundum; the formula comprises the following components in percentage by weight: 50-60% of calcium oxide (CaO), 20-25% of calcium fluoride (CaF2), 5-10% of magnesium oxide (MgO), 2-5% of high-purity magnesia (MgO), 5-8% of white corundum (Al2O3) and 2-5% of other additives (such as sodium carbonate and the like). The preparation method comprises the following steps: weighing the components, fully mixing in a uniform mixer, and drying until the moisture content is less than 0.1% to obtain the impurity removal agent. According to the method, the content of aluminum oxide in the copper liquid can be remarkably reduced through the steps and the use of the specific impurity removing agent proportion, and therefore the copper casting with the higher purity is obtained. Experimental data show that the impurity content can be reduced by more than 80%, and the mechanical property and the conductivity of the finished copper are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum smelting, and in particular to a method for preparing a dispersed copper refining impurity remover. Background Art

[0002] In the process of recycling copper alloy waste materials, how to effectively remove impurities in the copper liquid becomes the key to improving copper quality and production efficiency.

[0003] High-performance alumina dispersion-strengthened copper alloy is a nano-scale Al2O3 particle dispersed in a pure copper matrix with high strength, good thermal stability, small size, and the ability to hinder dislocation and grain boundary movement, thereby improving the comprehensive performance of the copper alloy, making the alloy a structural functional integrated material with good mechanical and physical properties, and having a series of excellent properties such as high strength, electrical and thermal conductivity, and high-temperature softening resistance. Due to the low yield rate of dispersed copper products in the industrial production process, it is inevitable that a large amount of waste materials containing Al2O3 particles and Al elements will be generated, which cannot be directly recycled and can only be sold at a low price, resulting in a large amount of cost waste.

[0004] Traditional copper alloy scrap smelting processes mostly use high-temperature smelting technology, which is effective in removing most impurities in copper alloy scraps, but for dispersion-strengthened copper alloy scraps, some difficult-to-remove aluminum oxides are attached to them. The presence of aluminum oxide not only reduces the electrical conductivity and mechanical properties of copper, but also has an adverse effect on the subsequent casting process. Due to the presence of these impurities, there is no mature technology for recycling aluminum oxide dispersion-strengthened copper alloy scraps, and the output of secondary copper smelting often cannot meet the market demand for high-purity copper.

[0005] In order to improve the purity of copper, researchers have proposed the use of refining agents. The basic principle of these refining agents is to convert impurities in copper liquid into easily removable compounds or substances through chemical reactions or physical adsorption. This method can not only operate under non-vacuum conditions, but also effectively reduce production costs and energy consumption.

[0006] There are many types of impurity removers, including oxides, fluorides, sulfides, etc. However, there are still some problems in the preparation and use of impurity removers in the prior art, such as:

[0007] Low reaction efficiency: Some impurity removers are unevenly dispersed in the copper solution, resulting in poor removal effect.

[0008] High cost: The raw materials of some impurity removers are expensive, which increases the production cost.

[0009] Environmental impact: Some impurity removers may produce harmful by-products during the reaction process, which will burden the environment.

[0010] Under this background, the preparation method and application of the dispersed copper refining impurity remover of the present invention came into being, aiming to solve the shortcomings of the existing impurity removers in use, and achieve efficient removal of impurities in copper liquid through scientific component ratios and precise smelting and casting processes, thereby improving the copper recovery rate and economic benefits. This can not only promote the progress of copper smelting technology, but also contribute to the sustainable utilization of resources. Summary of the invention

[0011] Based on the technical problems existing in the background technology, the present invention proposes a preparation method of a dispersed copper refining impurity remover.

[0012] The present invention provides a dispersed copper refining impurity remover, comprising raw materials and a formula ratio:

[0013] Raw materials: calcium oxide, calcium fluoride, calcium fluoride, magnesium oxide, high purity magnesia and white corundum;

[0014] Recipe ratio:

[0015] Calcium oxide (CaO): 50-60%

[0016] Calcium fluoride (CaF2): 20-25%

[0017] Magnesium oxide (MgO): 5-10%

[0018] High purity magnesia (MgO): 2-5%

[0019] White corundum (Al2O3): 5%-8%

[0020] Other additives (such as sodium carbonate, etc.): 2-5%.

[0021] After each component is weighed, it is fully mixed in a homogenizer and then dried until the moisture content is less than 0.1% to obtain the impurity remover of the present invention.

[0022] A method for preparing a dispersed copper refining impurity remover, wherein the waste alumina dispersed copper alloy (100 kg) after sawing is made into high-purity copper with alloy grade T1 for welding, comprising the following steps:

[0023] S1: Pretreatment: According to the characteristics of the aluminum oxide dispersed copper alloy scrap (surface water, oil, oxide scale), different pretreatment methods are used for the three different types of alloy scraps: dewatering, degreasing and descaling;

[0024] S2: Melting: Using non-vacuum melting, the scrap copper is heated to 1100-1200℃ in a non-vacuum induction furnace to ensure that the copper is completely melted;

[0025] S3: Online composition detection 1: After the copper material is completely melted, a small amount of copper liquid that has been fully stirred is taken out using a sampling crucible, and a direct reading spectrometer is used to detect the composition. The composition of the refining agent to be added is determined based on the content of aluminum oxide and other impurities;

[0026] S4: Adding refining impurity remover: After the copper liquid reaches the required temperature, gradually add the impurity remover prepared according to the above ratio, and the added amount is about 0.5-1.0% of the total weight of the copper liquid. The stirring speed needs to be controlled at 30-50rpm during the addition process to ensure that the impurity remover is evenly distributed in the copper liquid;

[0027] S5: Copper liquid refining: Maintain the copper liquid temperature at about 1150℃ and keep stirring. The refining time is controlled at 15-20 minutes to achieve the best impurity removal effect. In this process, impurities such as aluminum oxide react chemically with the components in the impurity remover to generate floating oxides (argon gas can be added to purge to promote the floating of slag);

[0028] S6: Online composition detection 2: Use a sampling crucible to take a small amount of fully refined copper liquid, and use a direct reading spectrometer to detect the composition to determine whether the composition meets the internal control standard. If not, add refining agent according to the following formula to refine the copper liquid again:

[0029] M 除杂剂 =M 铜液 ×(0.5%+K×[Al content])

[0030] Where M 除杂剂为 The amount of impurity remover added, M copper liquid is the mass of copper liquid, [Al content] is the aluminum content in the raw material, and K is the empirical coefficient (0.1-0.5);

[0031] S7: Debris removal: If the ingredients are tested to be qualified, use a debris removal spoon to remove the debris.

[0032] S8: Semi-continuous casting: The semi-continuous casting comprises the following steps:

[0033] a: Discharge: Open the stopper rod and discharge until the copper liquid level is at the height of the upper edge of the crystallizer;

[0034] b: Stable casting: Maintain the casting temperature at 1150-1200℃ and the casting speed at 50mm / min. Measure the temperature every 5 minutes and adjust the power of the holding furnace. At the same time, ensure the stability of casting parameters;

[0035] c: Casting is finished: close the stopper rod, stop casting, adjust the casting speed to 30mm / min, and keep other parameters unchanged. After the ingot comes out of the bottom edge of the crystallizer, turn off the cooling water and other equipment. Wait for another 40 minutes, remove the casting trolley, cool the ingot with water pipes, and hoist it to the ingot storage area.

[0036] Preferably, the following steps are required before the semi-continuous casting to ensure the quality of the ingot is intact:

[0037] S1: Alignment between the starter head and the crystallizer;

[0038] S2: Apply the coating evenly on the surface of the crystallizer and let it dry for ≥8min;

[0039] S3: The dummy head extends into the crystallizer;

[0040] S4: Align the crystallizer and the holding furnace;

[0041] S5: baking of crystallizer and pouring tube.

[0042] Preferably, the dehydration method includes airflow drying, which uses high-speed airflow to evaporate and carry away moisture, and can be combined with heating to improve drying efficiency. The airflow drying method uses nitrogen, and the nitrogen flow rate is set to 1-5m / s, and one level is increased for every 10kg of waste. At the same time, the heating temperature is set to 60-120°C, and the time varies from 1h to 10h, depending on the old material to be dried.

[0043] Preferably, the degreasing includes low-oxygen thermal degreasing, which is to heat in a low-oxygen environment to make the oil stain react or decompose with oxygen at a certain temperature, so as to promote the carbonization and shedding of the oil stain. The first step of this method is to fill the reaction chamber with an inert gas (such as nitrogen) to reduce the oxygen concentration to less than 10%; the second step is to put the material into a heating furnace and set the heating temperature to between 400°C and 600°C. The heating time varies from 0.5h to 3h according to the nature and thickness of the oil stain.

[0044] Preferably, the method needs to pay attention to cooling with the furnace during the cooling stage to avoid stress concentration caused by excessive cooling. If the old alloy material also contains oil stains, water should be removed first and then oil should be removed according to the above steps.

[0045] Preferably, the descaling comprises: the first step is to use high-pressure jetting of sand to physically impact and remove the scale of the old material. If this method is still not completely removed, it is transferred to an ultrasonic cleaning chamber, and the tiny bubbles generated by ultrasound in the cleaning liquid are used to remove the oxide layer through the collapse of the bubbles.

[0046] The beneficial effects of the present invention are:

[0047] 1. Through the above steps and the use of a specific impurity remover ratio, the aluminum oxide content in the copper liquid can be significantly reduced, thereby obtaining a copper casting with higher purity. Experimental data show that the impurity content can be reduced by more than 80%, and the mechanical properties and conductivity of the finished copper have been greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is the overall process flow chart of the method of the present invention;

[0049] Figure 2 It is the composition standard of refined copper alloy;

[0050] Figure 3 The chemical composition after smelting after online composition detection 1;

[0051] Figure 4 The chemical composition after smelting after online composition detection 2. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0053] Reference Figure 1-4 , a dispersed copper refining impurity remover, including raw materials and formula proportions:

[0054] Raw materials: calcium oxide, calcium fluoride, calcium fluoride, magnesium oxide, high purity magnesia and white corundum;

[0055] Recipe ratio:

[0056] Calcium oxide (CaO): 50-60%

[0057] Calcium fluoride (CaF2): 20-25%

[0058] Magnesium oxide (MgO): 5-10%

[0059] High purity magnesia (MgO): 2-5%

[0060] White corundum (Al2O3): 5%-8%

[0061] Other additives (such as sodium carbonate, etc.): 2-5%.

[0062] Calcium oxide (CaO): 50-60%

[0063] Function: Calcium oxide can react with aluminum oxide (Al2O3) at high temperature to generate calcium aluminum compounds with high melting points (such as CaO·Al2O3). This compound has a lower density than the copper liquid and can float to the surface of the copper liquid, making it easy to remove. The high efficiency of this reaction lies in the good interaction between CaO and Al2O3, which enables aluminum oxide to be quickly captured and discharged from the copper liquid.

[0064] Content selection: The design of the 50-60% ratio is based on the requirement for calcium oxide to fully react with aluminum oxide. Too low a CaO content will result in insufficient removal effect, while more than 60% may cause the impurity remover to have a too high melting point, making it difficult to disperse evenly, increasing the difficulty and cost of using the impurity remover. Therefore, a calcium oxide content of 50-60% has been proven to be a more ideal range.

[0065] Calcium fluoride (CaF2): 20-25%

[0066] Function: The main function of calcium fluoride is to lower the melting point of the entire impurity remover and improve the fluidity and dispersibility of the impurity remover in the copper liquid. CaF2, as a flux, can enhance the reaction efficiency of impurities in the copper liquid, thereby improving the overall impurity removal effect. In addition, CaF2 also helps to capture some lighter oxide inclusions.

[0067] Content selection: The CaF2 content is controlled at 20-25%, mainly to effectively reduce the melting point while avoiding excessive fluoride addition, which will cause adverse changes in the chemical properties of the copper liquid. Too low a content will affect the fluidity of the impurity remover, while too high a content of calcium fluoride will reduce the conductivity and metal quality of the copper liquid. Therefore, 20-25% CaF2 content is the optimal range.

[0068] Magnesium oxide (MgO): 5-10%

[0069] Function: Magnesium oxide is mainly used to react with other oxide impurities in copper liquid to form slag. At the same time, its high melting point enables it to exist stably in a high temperature environment and capture some impurities as a refractory material. In addition, MgO has good reactivity to some high melting point oxide impurities.

[0070] Content selection: The content is controlled at 5-10%, mainly to achieve the effect of impurity capture, while ensuring that magnesium oxide does not have unnecessary chemical reactions with copper liquid. Less than 5% will make the removal effect insignificant, while more than 10% will increase the cost. At the same time, too much magnesium oxide will increase the impurities in the residue and affect the purity of the copper liquid. Therefore, 5-10% is considered a reasonable content range.

[0071] White corundum (Al2O3): 5%-8%

[0072] Function: White corundum has a high melting point and chemical stability. It can react with other impurities during the smelting process to form stable solid or liquid compounds, inhibiting the formation of aluminum oxide. At the same time, using white corundum as a slag component can improve the fluidity and refining efficiency of aluminum liquid, while reducing the adhesion of slag at high temperature and reducing energy consumption.

[0073] Content selection: The content is controlled at 5-8%, which can ensure the fluxing effect while avoiding the additives from producing too many impurities in the copper liquid.

[0074] High purity magnesia (MgO): 2-5%

[0075] Function: High-purity magnesia can react with aluminum oxide in aluminum liquid to form magnesium aluminum spinel (MgAl2O4), which is a relatively stable compound that helps to remove oxide impurities in aluminum liquid. At the same time, after adding high-purity magnesia, the formation of magnesium aluminum spinel enhances the fluidity of the slag, which is convenient for subsequent separation and treatment.

[0076] Content selection: The content of high-purity magnesia is controlled at 2-5%, which can ensure the fluxing effect while avoiding the additive from producing too many volatile impurities in the copper liquid. When it is less than 2%, the effect is not obvious, and when it exceeds 5%, it may introduce extra impurities or volatile components that affect the quality of copper, so 2-5% is the best choice.

[0077] Other additives (such as sodium carbonate, etc.): 2-5%

[0078] Function: A small amount of additives (such as sodium carbonate) helps the melting and fluidity of the impurity remover. Sodium carbonate will decompose at high temperatures, and the generated gas and other components can help the inclusions float out, enhancing the impurity removal effect of the entire refining process.

[0079] Content selection: The content of sodium carbonate and other additives is controlled at 2-5%, which can ensure the fluxing effect while avoiding the additives from producing too many volatile impurities in the copper liquid. When it is less than 2%, the effect is not obvious, and when it exceeds 5%, it may introduce extra impurities or volatile components that affect the quality of copper, so 2-5% is the best choice.

[0080] After each component is weighed, it is fully mixed in a homogenizer and then dried until the moisture content is less than 0.1% to obtain the impurity remover of the present invention.

[0081] A method for preparing a dispersed copper refining impurity remover, wherein the waste alumina dispersed copper alloy (100 kg) after sawing is made into high-purity copper with alloy grade T1 for welding, comprising the following steps:

[0082] S1: Pretreatment: airflow drying method is used, the nitrogen flow rate is set to 3m / s, and the heating temperature is set to 400℃ for dehydration; after dehydration, low oxygen thermal deoiling method is used, nitrogen is introduced into the drying chamber, and when the oxygen content is monitored to 8%, the heating temperature is set to 80℃ for 1.5h;

[0083] S2: Melting: Put the pre-treated alloy waste material into the medium frequency melting furnace and control the melting temperature to 1150℃;

[0084] S3: Online composition detection 1: Use a sampling crucible to take a small amount of copper liquid that has been fully stirred, and use a direct reading spectrometer to detect the composition. The composition detection results are as follows: Figure 3 ;

[0085] S4: Adding refining and impurity-removing agent: Adding refining agent: Prepare the refining agent according to the following mass fraction:

[0086] Calcium oxide (CaO): 57.2%

[0087] Calcium fluoride (CaF2): 24.5%

[0088] Magnesium oxide (MgO): 7.2%

[0089] High purity magnesia (MgO): 5.0%

[0090] White corundum (Al2O3): 3.4%

[0091] Sodium carbonate: 2.7%

[0092] After weighing each component, mix them thoroughly in a homogenizer and then dry them until the moisture content is less than 0.1%. Weigh 7.5 kg of refining agent and add it to the copper liquid;

[0093] S5: Copper liquid refining: maintain the copper liquid temperature at about 1150°C and keep stirring, and the refining time is 20 minutes;

[0094] S6: Online composition detection 2: Use a sampling crucible to take a small amount of refined copper liquid and use a direct reading spectrometer to detect the composition. The composition results are as follows: Figure 4 :

[0095] S7: Slag removal: Use argon gas to purge, wait for the slag to float to the surface of the copper liquid, and use a slag removal spoon to remove the slag.

[0096] S8: Semi-continuous casting: The casting temperature is maintained at 1150°C and the casting speed is 50 mm / min. The mass of the pulled copper ingot is 99.72 kg.

[0097] The present invention includes semi-continuous casting: the following steps need to be performed before casting to ensure the quality of the ingot is intact:

[0098] S1: Alignment between the starter head and the crystallizer;

[0099] S2: Apply the coating evenly on the surface of the crystallizer and let it dry for ≥8min;

[0100] S3: The dummy head extends into the crystallizer;

[0101] S4: Align the crystallizer and the holding furnace;

[0102] S5: baking of crystallizer and pouring tube.

[0103] In the present invention, the dehydration method includes an airflow drying method, which uses a high-speed airflow to evaporate and carry away the water, and can be combined with heating to improve the drying efficiency. The airflow drying method uses nitrogen, and the nitrogen flow rate is set to 1-5m / s, and one level is increased for every 10kg of waste. At the same time, the heating temperature is set to 60-120°C, and the time varies from 1h to 10h, depending on the old material to be dried.

[0104] In the present invention, the degreasing includes low-oxygen thermal degreasing, which is to heat in a low-oxygen environment to make the oil stain react or decompose with oxygen at a certain temperature, so as to promote the carbonization and shedding of the oil stain. The first step of this method is to fill the reaction chamber with an inert gas (such as nitrogen) to reduce the oxygen concentration to less than 10%; the second step is to put the material into a heating furnace and set the heating temperature to between 400°C and 600°C. The heating time varies from 0.5h to 3h according to the nature and thickness of the oil stain.

[0105] In the present invention, the method should pay attention to cooling with the furnace during the cooling stage to avoid stress concentration caused by excessive cooling. If the old alloy material also contains oil stains, water should be removed first and then oil should be removed according to the above steps.

[0106] In the present invention, the descaling comprises: the first step is to use high-pressure spraying sand to physically impact and remove the scale of the old material. If this method is still not completely removed, it is transferred to an ultrasonic cleaning chamber, and the tiny bubbles generated by ultrasound in the cleaning liquid are used to remove the oxide layer through the collapse of the bubbles.

[0107] By adopting the method of the present invention, through the above steps and the use of a specific impurity remover ratio, the aluminum oxide content in the copper liquid can be significantly reduced, thereby obtaining a copper casting with higher purity. Experimental data show that the impurity content can be reduced by more than 80%, and the mechanical properties and conductivity of the finished copper are greatly improved.

[0108] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dispersed copper refining impurity remover, characterized in that: Including raw materials and formula ratio: Raw materials: calcium oxide, calcium fluoride, calcium fluoride, magnesium oxide, high purity magnesia and white corundum; Recipe ratio: Calcium oxide (CaO): 50-60% Calcium fluoride (CaF2): 20-25% Magnesium oxide (MgO): 5-10% High purity magnesia (MgO): 2-5% White corundum (Al2O3): 5%-8% Other additives (such as sodium carbonate, etc.): 2-5%. After each component is weighed, it is fully mixed in a homogenizer and then dried until the moisture content is less than 0.1% to obtain the impurity remover of the present invention.

2. The method for preparing a dispersed copper refining impurity remover according to claim 1, characterized in that , the sawn waste alumina dispersed copper alloy old material (100kg) is made into high-purity copper with alloy grade T1 for welding, including the following steps: S1: Pretreatment: According to the characteristics of the aluminum oxide dispersed copper alloy scrap (surface water, oil, oxide scale), different pretreatment methods are used for the three different types of alloy scraps: dewatering, degreasing and descaling; S2: Melting: Using non-vacuum melting, the scrap copper is heated to 1100-1200℃ in a non-vacuum induction furnace to ensure that the copper is completely melted; S3: Online composition detection 1: After the copper material is completely melted, a small amount of copper liquid that has been fully stirred is taken out using a sampling crucible, and a direct reading spectrometer is used to detect the composition. The composition of the refining agent to be added is determined based on the content of aluminum oxide and other impurities; S4: Adding refining impurity remover: After the copper liquid reaches the required temperature, gradually add the impurity remover prepared according to the above ratio, and the added amount is about 0.5-1.0% of the total weight of the copper liquid. The stirring speed needs to be controlled at 30-50rpm during the addition process to ensure that the impurity remover is evenly distributed in the copper liquid; S5: Copper liquid refining: Maintain the copper liquid temperature at about 1150℃ and keep stirring. The refining time is controlled at 15-20 minutes to achieve the best impurity removal effect. In this process, impurities such as aluminum oxide react chemically with the components in the impurity remover to generate floating oxides (argon gas can be added to purge to promote the floating of slag); S6: Online composition detection 2: Use a sampling crucible to take a small amount of fully refined copper liquid, and use a direct reading spectrometer to detect the composition to determine whether the composition meets the internal control standard. If not, add refining agent according to the following formula to refine the copper liquid again: M 除杂剂 =M 铜液 ×(0.5%+K×[Al content]) Where M 除杂剂为 The amount of impurity remover added, M copper liquid is the mass of copper liquid, [Al content] is the aluminum content in the raw material, and K is the empirical coefficient (0.1-0.5); S7: Debris removal: If the ingredients are tested to be qualified, use a debris removal spoon to remove the debris. S8: Semi-continuous casting: The semi-continuous casting comprises the following steps: a: Discharge: Open the stopper rod and discharge until the copper liquid level is at the height of the upper edge of the crystallizer; b: Stable casting: Maintain the casting temperature at 1150-1200℃ and the casting speed at 50mm / min. Measure the temperature every 5 minutes and adjust the power of the holding furnace. At the same time, ensure the stability of casting parameters; c: Casting is finished: close the stopper rod, stop casting, adjust the casting speed to 30mm / min, and keep other parameters unchanged. After the ingot comes out of the bottom edge of the crystallizer, turn off the cooling water and other equipment. Wait for another 40 minutes, remove the casting trolley, cool the ingot with water pipes, and hoist it to the ingot storage area.

3. The method for preparing a dispersed copper refining impurity remover according to claim 2, characterized in that: The following steps need to be performed before the semi-continuous casting to ensure the quality of the ingot is intact: S1: Alignment between the starter head and the crystallizer; S2: Apply the coating evenly on the surface of the crystallizer and let it dry for ≥8min; S3: the dummy head extends into the crystallizer; S4: Align the crystallizer and the holding furnace; S5: baking of crystallizer and pouring tube.

4. The method for preparing a dispersed copper refining impurity remover according to claim 2, characterized in that: The dehydration method includes an airflow drying method, which uses a high-speed airflow to evaporate and carry away moisture, and can be combined with heating to improve drying efficiency. The airflow drying method uses nitrogen, and the nitrogen flow rate is set to 1-5m / s, and the waste is raised by one level for every 10kg of waste. At the same time, the heating temperature is set to 60-120°C, and the time ranges from 1h to 10h, depending on the old material being dried.

5. The method for preparing a dispersed copper refining impurity remover according to claim 4, characterized in that: The degreasing includes low-oxygen thermal degreasing, which is to heat in a low-oxygen environment to make the oil stain react or decompose with oxygen at a certain temperature, so as to promote the carbonization and shedding of the oil stain. The first step of this method is to fill the reaction chamber with an inert gas (such as nitrogen) to reduce the oxygen concentration to less than 10%; the second step is to put the material into a heating furnace and set the heating temperature to between 400°C and 600°C. The heating time varies from 0.5h to 3h according to the nature and thickness of the oil stain.

6. The method for preparing a dispersed copper refining impurity remover according to claim 5, characterized in that: This method requires attention to the cooling stage during which the furnace should be cooled to avoid stress concentration caused by excessive cooling. If the old alloy material also contains oil stains, remove water first and then remove oil according to the above steps.

7. The method for preparing a dispersed copper refining impurity remover according to claim 5, characterized in that: The descaling comprises: the first step is to use high pressure spraying sand to physically impact and remove the scale of the old alloy material. If this method is still not completely removed, it is transferred to an ultrasonic cleaning room, and the tiny bubbles generated by ultrasound in the cleaning liquid are used to remove the oxide layer through the collapse of the bubbles.

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