A continuous casting process of low-oxygen high-purity phosphor copper rod based on scrap copper

Abstract

The present application relates to a kind of low-oxygen high-purity phosphor copper rod based on waste copper scrap continuous casting process, belong to copper processing technical field.Pre-treated waste copper scrap is added to smelting furnace, with natural gas as fuel, and temperature is raised smelting;Oxygen is introduced into the molten liquid, and dross is removed;Phosphor copper alloy is added to the molten liquid, and phosphorus content is controlled;Refining agent is added to the molten liquid for refining;The refined molten liquid is continuously cast by continuous casting machine, and casting blank is obtained;Casting blank is subjected to multi-pass rolling;After rolling, copper rod is cooled by sebacic acid amidation cooling dispersion liquid, and low-oxygen high-purity phosphor copper rod is obtained;Sebacic acid amidation cooling dispersion liquid is prepared by sebacic acid, 2,2'-diamino-3,3'-dipyridyl, propylene glycol methyl ether, p-toluenesulfonic acid, deionized water, 1,2,4,5-tetrazine-3,6-diamine;The phosphor copper rod prepared by the present application has low oxygen content, high purity, good mechanical properties, and meets the market demand for high-quality phosphor copper rod.

Description

Technical Field

[0001] This invention relates to the field of copper processing technology, and in particular to a continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper. Background Technology

[0002] With the rapid development of the electronics and electrical industries, the demand for low-oxygen, high-purity phosphor bronze rods is increasing. Phosphor bronze rods possess excellent electrical and thermal conductivity and processing properties, and are widely used in wires and cables, electronic components, and other fields. Traditional phosphor bronze rod production processes mostly use electrolytic copper as raw material, resulting in high costs. However, my country has abundant scrap copper resources, and the recycling and utilization of scrap copper has significant economic and environmental implications.

[0003] Chinese Patent CN116984573B belongs to the field of copper material processing technology, specifically involving a process for producing low-oxygen copper rods based on modified recycled copper through continuous casting and rolling. The provided process includes smelting, refining, casting, rolling, cleaning, and cooling steps. The refining process comprises two stages: oxidation and reduction. Slag is removed after each stage. During the oxidation stage, a modifier composed of magnesium silicate and quartz sand is added. After slag removal during the reduction stage, graphene and rare earth elements are added.

[0004] Chinese Patent CN117816917B relates to the field of oxygen-free copper rod preparation, specifically providing a method for preparing oxygen-free copper rod. The main steps include baking, melting, heat preservation, and solidification of electrolytic copper plate raw materials into a solid, and drawing the copper rod upwards. In this application, the structure of the melting furnace is specifically adjusted, with several vent pipes evenly distributed at intervals on the bottom and peripheral walls of the melting furnace. During the melting process, several vent pipes at the bottom of the melting furnace extend into the molten copper, continuously introducing nitrogen gas into the molten copper. After melting is completed, the vent pipes arranged on the bottom and peripheral walls of the melting furnace are opened simultaneously to supply nitrogen gas into the molten copper.

[0005] Existing processes for producing phosphor bronze rods from scrap copper have several problems. Firstly, scrap copper contains a wide variety of impurities, including lead, tin, zinc, iron, arsenic, and antimony. Traditional processes struggle to completely remove these impurities, resulting in low product purity and affecting performance. Secondly, achieving uniform phosphorus addition is difficult, leading to uneven phosphorus distribution in the copper rod and impacting product quality stability. Furthermore, existing continuous casting processes are inadequate in controlling oxygen content, resulting in excessively high oxygen content in the produced phosphor bronze rods, reducing their conductivity and machinability. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, the operation steps of which are as follows:

[0007] S1 Raw Material Selection and Pretreatment: Scrap copper with a copper content of 92wt% is first removed by magnetic separation to remove ferromagnetic impurities, and then impurities larger than 5cm are removed by screening equipment; then 10-20 parts by weight of scrap copper are soaked in 30-100 parts by weight of cleaning solution for 20-30 minutes to remove surface oil and plastic impurities, and after drying, it is crushed into small pieces of 2-3cm.

[0008] S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted;

[0009] S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool;

[0010] S4 phosphorus copper alloy addition: When the melt temperature drops to 1150-1250℃, add 0.01-0.1 parts by weight of phosphorus copper alloy, stir for 10-20 minutes, so that the phosphorus content reaches 0.01-0.05 wt%;

[0011] S5 Refining: Add 0.01-0.03 parts by weight of refining agent to the melt, stir evenly, and let stand for 20-30 minutes;

[0012] S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite.

[0013] S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 50-70%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain low-oxygen high-purity phosphorus copper rod.

[0014] In some embodiments, the cleaning solution contains 1-1.5 wt% sodium dodecylbenzenesulfonate, 0.5-0.8 wt% sodium carbonate, and the remainder is water.

[0015] In some embodiments, the melting temperature of S2 is 1200-1300℃ and the furnace pressure is 50-80Pa.

[0016] In some embodiments, the oxygen ventilation rate of S3 is 0.3-0.5 m³ / min, and the ventilation time is 10-20 minutes.

[0017] In some embodiments, the refining agent consists of borax and sodium carbonate in a mass ratio of 2:1.

[0018] In some embodiments, the casting speed of S6 is 1-3 m / min.

[0019] In some embodiments, the rolling temperature of S7 is 800-900°C.

[0020] In some embodiments, the preparation method of the sebacic acid amidated cooling dispersion is as follows:

[0021] Based on mass parts, 5-8 parts sebacic acid, 3-5 parts 2,2'-diamino-3,3'-bipyridine, 50-60 parts propylene glycol methyl ether, and 0.2-0.4 parts p-toluenesulfonic acid are reacted at 80-90℃ for 2-5 hours. After the reaction solution is cooled, 130-170 parts deionized water and 0.8-1.2 parts 1,2,4,5-tetraazine-3,6-diamine are added, and the mixture is ultrasonically dispersed for 25-50 minutes to obtain a sebacic acid amidated cooling dispersion.

[0022] Reaction mechanism:

[0023] The long-chain carboxyl group of sebacic acid reacts with the amino group in 2,2'-diamino-3,3'-bipyridine under the catalysis of p-toluenesulfonic acid at 80-90℃ to form a branched polyamide structure.

[0024] 1,2,4,5-Tetraazine-3,6-diamine combines with the polyamide generated above via amide bonds to form a stable composite system. This system can synergistically act on the copper surface to inhibit its oxidation.

[0025] The long-chain structure of sebacic acid forms a lubricating film after the reaction, which can help protect the antioxidant film formed on the copper surface and enhance the overall protective effect.

[0026] Technical effects:

[0027] This invention provides a low-oxygen, high-purity phosphorus copper rod continuous casting process based on scrap copper. Compared with existing technologies, this invention has the following significant advantages:

[0028] 1. The lubricating film formed by the long-chain structure of sebacic acid can effectively reduce the coefficient of friction, reduce scratches on copper rods during rolling, and improve the surface quality of the product.

[0029] 2. The compounded antioxidant components (a combination system of branched polyamide and 1,2,4,5-tetraazine-3,6-diamine) can effectively prevent oxidation of the copper rod surface and maintain the stability of the copper's electrical conductivity and other physicochemical properties.

[0030] 3. The synergistic effect of the lubricating film and the anti-oxidation film significantly improves the overall protection of the copper rod and extends its storage and service life.

[0031] 4. The phosphor bronze rod prepared by this invention has low oxygen content, high purity, and good mechanical properties, meeting the market demand for high-quality phosphor bronze rods. Detailed Implementation

[0032] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description is provided in conjunction with embodiments and comparative examples:

[0033] 1. Purity of phosphor bronze rods: determined by spectroscopic analysis;

[0034] 2. Oxygen content: determined using pulse heating inert gas melting-infrared absorption method;

[0035] 3. Tensile strength: determined using an electronic universal testing machine.

[0036] Example 1

[0037] A continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, comprising the following steps:

[0038] S1 Raw Material Selection and Pretreatment: Scrap copper with a copper content of 92wt% is first removed by magnetic separation to remove ferromagnetic impurities, and then impurities larger than 5cm are removed by screening equipment; then 10g of scrap copper is soaked in 30g of cleaning solution for 20 minutes to remove surface oil and plastic impurities, and after being taken out, dried, and broken into small pieces of 3cm.

[0039] S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted;

[0040] S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool;

[0041] S4 phosphorus copper alloy addition: When the melt temperature drops to 1150℃, add 0.01g of phosphorus copper alloy and stir for 10 minutes to bring the phosphorus content to 0.01%.

[0042] S5 Refining: Add 0.01g of refining agent to the melt, stir well and let stand for 20 minutes;

[0043] S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite.

[0044] S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 50%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain a low-oxygen, high-purity phosphorus copper rod.

[0045] The cleaning solution contains 1% sodium dodecylbenzenesulfonate, 0.5% sodium carbonate, and the remainder is water.

[0046] The S2 melting temperature is 1200℃ and the furnace pressure is 50Pa.

[0047] The oxygen ventilation rate of S3 is 0.3 m³ / min, and the ventilation time is 10 minutes.

[0048] The refining agent is composed of borax and sodium carbonate in a mass ratio of 2:1.

[0049] The S6 casting speed is 1 m / min.

[0050] The rolling temperature of S7 is 800℃.

[0051] The preparation method of the sebacic acid amidated cooling dispersion is as follows:

[0052] 5g sebacic acid, 3-5g 2,2'-diamino-3,3'-bipyridine, 50g propylene glycol methyl ether, and 0.2g p-toluenesulfonic acid were reacted at 80℃ for 2 hours. After the reaction solution was cooled, 130g deionized water and 0.8g 1,2,4,5-tetraazine-3,6-diamine were added, and the mixture was ultrasonically dispersed for 25 minutes to obtain a sebacic acid amidated cooling dispersion.

[0053] Example 2

[0054] A continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, comprising the following steps:

[0055] S1 Raw Material Selection and Pretreatment: 92wt% copper scrap is first removed by magnetic separation to remove ferromagnetic impurities, and then screened to remove impurities larger than 5cm. Then, 13g of scrap copper is soaked in 50g of cleaning solution for 25 minutes to remove surface oil and plastic impurities. After drying, it is crushed into small pieces of 3cm.

[0056] S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted;

[0057] S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool;

[0058] S4 phosphorus copper alloy addition: When the melt temperature drops to 1180℃, add 0.05g of phosphorus copper alloy and stir for 15 minutes to bring the phosphorus content to 0.02%.

[0059] S5 Refining: Add 0.02g of refining agent to the melt, stir well and let stand for 25 minutes;

[0060] S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite.

[0061] S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 55%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain a low-oxygen, high-purity phosphorus copper rod.

[0062] The cleaning solution contains 1.2% sodium dodecylbenzenesulfonate, 0.6% sodium carbonate, and the remainder is water.

[0063] The S2 melting temperature is 1240℃ and the furnace pressure is 60Pa.

[0064] The oxygen ventilation rate of S3 is 0.4 m³ / min, and the ventilation time is 15 minutes.

[0065] The refining agent is composed of borax and sodium carbonate in a mass ratio of 2:1.

[0066] The S6 casting speed is 2 m / min.

[0067] The rolling temperature of S7 is 840℃.

[0068] The preparation method of the sebacic acid amidated cooling dispersion is as follows:

[0069] 6g sebacic acid, 4g 2,2'-diamino-3,3'-bipyridine, 53g propylene glycol methyl ether, and 0.3g p-toluenesulfonic acid were reacted at 85℃ for 3 hours. After the reaction solution was cooled, 140g deionized water and 0.9g 1,2,4,5-tetraazine-3,6-diamine were added, and the mixture was ultrasonically dispersed for 35 minutes to obtain a sebacic acid amidated cooling dispersion.

[0070] Example 3

[0071] A continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, comprising the following steps:

[0072] S1 Raw Material Selection and Pretreatment: 92wt% copper scrap is first removed by magnetic separation to remove ferromagnetic impurities, and then screened to remove impurities larger than 5cm. Then, 18g of scrap copper is soaked in 70g of cleaning solution for 25 minutes to remove surface oil and plastic impurities. After drying, it is crushed into small pieces of 2cm.

[0073] S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted;

[0074] S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool;

[0075] S4 phosphorus copper alloy addition: When the melt temperature drops to 1230℃, add 0.08g of phosphorus copper alloy and stir for 15 minutes to bring the phosphorus content to 0.04%.

[0076] S5 Refining: Add 0.02g of refining agent to the melt, stir well and let stand for 25 minutes;

[0077] S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite.

[0078] S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 65%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain a low-oxygen, high-purity phosphorus copper rod.

[0079] The cleaning solution contains 1.4% sodium dodecylbenzenesulfonate, 0.7% sodium carbonate, and the remainder is water.

[0080] The S2 melting temperature is 1280℃ and the furnace pressure is 70Pa.

[0081] The oxygen ventilation rate of S3 is 0.4 m³ / min, and the ventilation time is 15 minutes.

[0082] The refining agent is composed of borax and sodium carbonate in a mass ratio of 2:1.

[0083] The S6 casting speed is 2 m / min.

[0084] The rolling temperature of S7 is 880℃.

[0085] The preparation method of the sebacic acid amidated cooling dispersion is as follows:

[0086] 7g sebacic acid, 4g 2,2'-diamino-3,3'-bipyridine, 58g propylene glycol methyl ether, and 0.3g p-toluenesulfonic acid were reacted at 85℃ for 4 hours. After the reaction solution was cooled, 160g deionized water and 1.1g 1,2,4,5-tetraazine-3,6-diamine were added, and the mixture was ultrasonically dispersed for 45 minutes to obtain a sebacic acid amidated cooling dispersion.

[0087] Example 4

[0088] A continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, comprising the following steps:

[0089] S1 Raw Material Selection and Pretreatment: 92wt% copper scrap is first removed by magnetic separation to remove ferromagnetic impurities, and then screened to remove impurities larger than 5cm. Then, 20g of scrap copper is soaked in 100g of cleaning solution for 30 minutes to remove surface oil and plastic impurities. After drying, it is crushed into small pieces of 2cm.

[0090] S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted;

[0091] S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool;

[0092] S4 phosphorus copper alloy addition: When the melt temperature drops to 1250℃, add 0.1g of phosphorus copper alloy and stir for 20 minutes to bring the phosphorus content to 0.05%.

[0093] S5 Refining: Add 0.03g of refining agent to the melt, stir well and let stand for 30 minutes;

[0094] S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite.

[0095] S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 70%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain a low-oxygen, high-purity phosphorus copper rod.

[0096] The cleaning solution contains 1.5% sodium dodecylbenzenesulfonate, 0.8% sodium carbonate, and the remainder is water.

[0097] The S2 melting temperature is 1300℃ and the furnace pressure is 80Pa.

[0098] The oxygen ventilation rate of S3 is 0.5 m³ / min, and the ventilation time is 20 minutes.

[0099] The refining agent is composed of borax and sodium carbonate in a mass ratio of 2:1.

[0100] The S6 casting speed is 3 m / min.

[0101] The rolling temperature of S7 is 900℃.

[0102] The preparation method of the sebacic acid amidated cooling dispersion is as follows:

[0103] 8g sebacic acid, 3-5g 2,2'-diamino-3,3'-bipyridine, 60g propylene glycol methyl ether, and 0.4g p-toluenesulfonic acid were reacted at 90℃ for 5 hours. After the reaction solution was cooled, 170g deionized water and 1.2g 1,2,4,5-tetraazine-3,6-diamine were added, and the mixture was ultrasonically dispersed for 50 minutes to obtain a sebacic acid amidated cooling dispersion.

[0104] Comparative Example 1

[0105] A continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, comprising the following steps:

[0106] S1 Raw Material Selection and Pretreatment: Scrap copper with a copper content of 92wt% is first removed by magnetic separation to remove ferromagnetic impurities, and then impurities larger than 5cm are removed by screening equipment; then 10g of scrap copper is soaked in 30g of cleaning solution for 20 minutes to remove surface oil and plastic impurities, and after being taken out, dried, and broken into small pieces of 3cm.

[0107] S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted;

[0108] S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool;

[0109] S4 phosphorus copper alloy addition: When the melt temperature drops to 1150℃, add 0.01g of phosphorus copper alloy and stir for 10 minutes to bring the phosphorus content to 0.01%.

[0110] S5 Refining: Add 0.01g of refining agent to the melt, stir well and let stand for 20 minutes;

[0111] S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite.

[0112] S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 50%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain a low-oxygen, high-purity phosphorus copper rod.

[0113] The cleaning solution contains 1% sodium dodecylbenzenesulfonate, 0.5% sodium carbonate, and the remainder is water.

[0114] The S2 melting temperature is 1200℃ and the furnace pressure is 50Pa.

[0115] The oxygen ventilation rate of S3 is 0.3 m³ / min, and the ventilation time is 10 minutes.

[0116] The refining agent is composed of borax and sodium carbonate in a mass ratio of 2:1.

[0117] The S6 casting speed is 1 m / min.

[0118] The rolling temperature of S7 is 800℃.

[0119] The preparation method of the sebacic acid amidated cooling dispersion is as follows:

[0120] 5g sebacic acid, 50g propylene glycol methyl ether, and 0.2g p-toluenesulfonic acid were reacted at 80℃ for 2 hours. After the reaction solution was cooled, 130g deionized water was added, and the mixture was ultrasonically dispersed for 25 minutes to obtain a sebacic acid amidated cooling dispersion.

[0121] Comparative Example 2

[0122] A continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, comprising the following steps:

[0123] S1 Raw Material Selection and Pretreatment: Scrap copper with a copper content of 92wt% is first removed by magnetic separation to remove ferromagnetic impurities, and then impurities larger than 5cm are removed by screening equipment; then 10g of scrap copper is soaked in 30g of cleaning solution for 20 minutes to remove surface oil and plastic impurities, and after being taken out, dried, and broken into small pieces of 3cm.

[0124] S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted;

[0125] S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool;

[0126] S4 phosphorus copper alloy addition: When the melt temperature drops to 1150℃, add 0.01g of phosphorus copper alloy and stir for 10 minutes to bring the phosphorus content to 0.01%.

[0127] S5 Refining: Add 0.01g of refining agent to the melt, stir well and let stand for 20 minutes;

[0128] S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite.

[0129] S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 50%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain a low-oxygen, high-purity phosphorus copper rod.

[0130] The cleaning solution contains 1% sodium dodecylbenzenesulfonate, 0.5% sodium carbonate, and the remainder is water.

[0131] The S2 melting temperature is 1200℃ and the furnace pressure is 50Pa.

[0132] The oxygen ventilation rate of S3 is 0.3 m³ / min, and the ventilation time is 10 minutes.

[0133] The refining agent is composed of borax and sodium carbonate in a mass ratio of 2:1.

[0134] The S6 casting speed is 1 m / min.

[0135] The rolling temperature of S7 is 800℃.

[0136] The preparation method of the sebacic acid amidated cooling dispersion is as follows:

[0137] 5g sebacic acid, 50g propylene glycol methyl ether, and 0.2g p-toluenesulfonic acid were reacted at 80℃ for 2 hours. After the reaction solution was cooled, 130g deionized water and 0.8g 1,2,4,5-tetraazine-3,6-diamine were added, and the mixture was ultrasonically dispersed for 25 minutes to obtain a sebacic acid amidated cooling dispersion.

[0138] Comparative Example 3

[0139] A continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, comprising the following steps:

[0140] S1 Raw Material Selection and Pretreatment: Scrap copper with a copper content of 92wt% is first removed by magnetic separation to remove ferromagnetic impurities, and then impurities larger than 5cm are removed by screening equipment; then 10g of scrap copper is soaked in 30g of cleaning solution for 20 minutes to remove surface oil and plastic impurities, and after being taken out, dried, and broken into small pieces of 3cm.

[0141] S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted;

[0142] S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool;

[0143] S4 phosphorus copper alloy addition: When the melt temperature drops to 1150℃, add 0.01g of phosphorus copper alloy and stir for 10 minutes to bring the phosphorus content to 0.01%.

[0144] S5 Refining: Add 0.01g of refining agent to the melt, stir well and let stand for 20 minutes;

[0145] S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite.

[0146] S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 50%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain a low-oxygen, high-purity phosphorus copper rod.

[0147] The cleaning solution contains 1% sodium dodecylbenzenesulfonate, 0.5% sodium carbonate, and the remainder is water.

[0148] The S2 melting temperature is 1200℃ and the furnace pressure is 50Pa.

[0149] The oxygen ventilation rate of S3 is 0.3 m³ / min, and the ventilation time is 10 minutes.

[0150] The refining agent is composed of borax and sodium carbonate in a mass ratio of 2:1.

[0151] The S6 casting speed is 1 m / min.

[0152] The rolling temperature of S7 is 800℃.

[0153] The preparation method of the sebacic acid amidated cooling dispersion is as follows:

[0154] 5g sebacic acid, 3-5g 2,2'-diamino-3,3'-bipyridine, 50g propylene glycol methyl ether, and 0.2g p-toluenesulfonic acid were reacted at 80℃ for 2 hours. After the reaction solution was cooled, 130g deionized water was added, and the mixture was ultrasonically dispersed for 25 minutes to obtain a sebacic acid amidated cooling dispersion.

[0155] Table 1: Test Results of Examples and Comparative Examples

[0156]

[0157] Based on the data analysis of the above embodiments and comparative examples, the phosphor bronze rod prepared by the present invention has low oxygen content, high purity, and good mechanical properties, thus meeting the market demand for high-quality phosphor bronze rods.

[0158] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper, characterized in that: The operating steps are as follows: S1 Raw Material Selection and Pretreatment: Scrap copper with a copper content of 92wt% is first removed by magnetic separation to remove ferromagnetic impurities, and then impurities larger than 5cm are removed by screening equipment; then 10-20 parts by weight of scrap copper are soaked in 30-100 parts by weight of cleaning solution for 20-30 minutes to remove surface oil and plastic impurities, and after being taken out, dried, and broken into small pieces of 2-3cm. S2 smelting: The pre-treated scrap copper is added to the smelting furnace and heated and smelted using natural gas as fuel, so that the scrap copper is completely melted; S3 Oxidation and Impurity Removal: Oxygen is introduced into the molten metal to oxidize impurities and form scum, which is then removed using a scum removal tool; S4 phosphorus copper alloy addition: When the melt temperature drops to 1150-1250℃, add 0.01-0.1 parts by weight of phosphorus copper alloy, stir for 10-20 minutes, so that the phosphorus content reaches 0.01-0.05 wt%; S5 Refining: Add 0.01-0.03 parts by weight of refining agent to the melt, stir evenly, and let stand for 20-30 minutes; S6 Continuous Casting: The refined molten metal is continuously cast using a continuous casting machine, and the crystallizer is made of graphite. S7 Rolling and Cooling: The billet is rolled in multiple passes with a total processing rate of 50-70%; the rolled copper rod is cooled by sebacic acid amidation cooling dispersion to obtain a low-oxygen, high-purity phosphorus copper rod. The preparation method of the sebacic acid amidated cooling dispersion is as follows: Based on mass parts, 5-8 parts sebacic acid, 3-5 parts 2,2'-diamino-3,3'-bipyridine, 50-60 parts propylene glycol methyl ether, and 0.2-0.4 parts p-toluenesulfonic acid are reacted at 80-90℃ for 2-5 hours. After the reaction solution is cooled, 130-170 parts deionized water and 0.8-1.2 parts 1,2,4,5-tetraazine-3,6-diamine are added, and the mixture is ultrasonically dispersed for 25-50 minutes to obtain a sebacic acid amidated cooling dispersion.

2. The continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper according to claim 1, characterized in that: The cleaning solution contains 1-1.5 wt% sodium dodecylbenzenesulfonate, 0.5-0.8 wt% sodium carbonate, and the remainder is water.

3. The continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper according to claim 1, characterized in that: The melting temperature of S2 is 1200-1300℃, and the furnace pressure is 50-80Pa.

4. The continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper according to claim 1, characterized in that: The oxygen flow rate of S3 is 0.3-0.5 m³ / min, and the ventilation time is 10-20 minutes.

5. The continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper according to claim 1, characterized in that: The refining agent is composed of borax and sodium carbonate in a mass ratio of 2:

1.

6. The continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper according to claim 1, characterized in that: The casting speed of S6 is 1-3 m / min.

7. The continuous casting process for low-oxygen, high-purity phosphorus copper rods based on scrap copper according to claim 1, characterized in that: The rolling temperature of S7 is 800-900℃.

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