A system and process for obtaining micro-nano platinum particles by mechanical method

Abstract

The present invention relates to the technical field of the preparation of electrochemical materials, and particularly to a system and process for obtaining micro-nano platinum particles by a mechanical method, including a production system. The production system includes a blade cutting machine, which is connected by a pipeline to a spiral vibrating screen. The spiral vibrating screen is cooperatively provided with a crucible for storing materials. The production system is also cooperatively provided with a reverse osmosis electrodeionization device system. The crucible is cooperatively provided with a liquid nitrogen storage tank and a material-liquid mixing chamber. The material-liquid mixing chamber is cooperatively provided with a reaction kettle. The material-liquid mixing chamber is connected by a pipeline to a crusher. The crusher is cooperatively provided with a suspension filter. The suspension filter is connected to a low-temperature vacuum dryer. The low-temperature vacuum dryer is connected to a tubular furnace. The tubular furnace is cooperatively provided with a grinder. A screening machine is provided on one side of the grinder. By precisely controlling the parameters of each step, the present invention ensures the high purity and high quality of the product, and at the same time improves the production efficiency and product performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical material preparation, and particularly to a system and process for obtaining micro-nano platinum particles by a mechanical method. Background Art

[0002] Hydrogen energy is a green and clean energy that is being gradually applied. How to produce and use hydrogen is the key to hydrogen energy utilization; an acidic water electrolyzer can electrolyze water to convert electrical energy into hydrogen energy. A hydrogen fuel cell is an important application of hydrogen energy. These two clean energy conversion systems are the key to hydrogen energy utilization. For these two devices to achieve high performance and high energy conversion efficiency, a catalyst with high activity and stability is essential; micro-nano platinum particles (platinum black) have excellent electrocatalytic performance and good corrosion resistance, and are the core catalyst materials for acidic electrolytic water tanks and hydrogen fuel cells. Therefore, a preparation method of platinum nanocrystals with simple operation, low cost, and high target product yield is of great significance for the application of hydrogen energy.

[0003] Micro-nano platinum particles play an important role in the fields of chemical reactions and energy conversion. Their unique catalytic performance, especially in the applications of catalytic water electrolysis for hydrogen production and as fuel cell power generation, is providing new prospects for achieving sustainable energy and clean technologies; the characteristics of micro-nano platinum particles catalyzing redox reactions in stages at room temperature make them an important catalyst; especially for mixtures of methanol, ethanol, hydrogen, and air, nano-platinum powder can promote the staged oxidation and reduction of these gases at room temperature and produce a continuous exothermic or electrical energy effect; it has the characteristics of good catalytic effect and long-term stability.

[0004] When producing micro-nano platinum particles, chemical reagents such as chloroplatinic acid are usually used as raw materials, and formaldehyde, hydrazine, etc. are used as reducing agents to produce catalysts such as platinum black and platinum supported on carbon. These methods have disadvantages such as wastewater polluting the environment and low yield. Patent 201180050597.5 proposes a method for manufacturing an oxide-dispersed platinum alloy, which has low crushing efficiency because it does not perform cold treatment before crushing, and the product is mainly used as a sheet rather than a catalyst.

[0005] In order to overcome the above disadvantages, developing a production preparation method of micro-nano platinum catalyst with high efficiency, environmental protection, and high yield has important application value and environmental benefits. Summary of the Invention

[0006] To solve some problems existing in the above-mentioned prior art, the present invention provides a system and process for obtaining micro-nano platinum particles by a mechanical method to address the deficiencies in the prior art.

[0007] To achieve the above object, the present invention provides a system for obtaining micro-nano platinum particles by mechanical method, including a production system. The production system includes a blade cutting machine, which is connected by a pipeline to a spiral vibrating screen. The spiral vibrating screen is cooperatively provided with a crucible for storing materials. The production system is also cooperatively provided with a reverse osmosis electrodeionization device system. The crucible is cooperatively provided with a liquid nitrogen storage tank and a material-liquid mixing tank. The material-liquid mixing tank is cooperatively provided with a reaction kettle. The material-liquid mixing tank is connected by a pipeline to a crusher. The crusher is cooperatively provided with a suspension filter. The suspension filter is connected to a low-temperature vacuum dryer. The low-temperature vacuum dryer is connected to a tube furnace. The tube furnace is cooperatively provided with a grinding machine. A screening machine is provided on one side of the grinding machine.

[0008] A process for a system for obtaining micro-nano platinum particles by mechanical method. The process of the system includes a material preparation stage, a material reaction and crushing stage, and a material drying and screening stage. The material preparation stage includes the following steps

[0009] Step 1: Select high-quality and high-purity platinum metal sheets as the starting materials, ensure no cracks or inclusions, and maintain high surface finish. Cut the platinum metal sheet raw materials into strips with a width of 1.8 - 3 mm by a blade cutting machine. After the cutting is completed, the materials are weighed and then sorted by a spiral vibrating screen and transported to different crucibles for the next processing step;

[0010] Step 2: Put the materials together with several groups of crucibles into a liquid nitrogen storage tank and cool them to -196 °C and keep for 0.3 - 3 h. At the same time, prepare crushers with different powers. The crushing process adopts a periodic operation, with a cycle of 3 hours. Each crushing lasts for 10 minutes, and then stops for 2 minutes to avoid overheating of the equipment and excessive crushing of the materials. Set the platinum metal sheet raw materials and the crushers in one-to-one correspondence;

[0011] Step 3: Through the reverse osmosis electrodeionization device system, perform multi-stage filtration and deionization treatment on the raw water to remove ions, impurities, and microorganisms in the water, and make the raw water into deionized water through the reverse osmosis electrodeionization device system.

[0012] A process for a system for obtaining micro-nano platinum particles by mechanical method. The material reaction and crushing stage includes the following steps:

[0013] Step 1: In the material-liquid mixing tank, mix the weighed platinum particle materials with the prepared deionized water. By adjusting the flow regulating valve and the flowmeter, precisely control the flow rate and mixing ratio of the liquid to ensure that the concentration of the suspension reaches the predetermined requirements. During the mixing process, use a stirrer for sufficient stirring to ensure that the platinum particles are evenly distributed in the suspension;

[0014] Step 2: Continuously convey the mixed liquid of platinum particle materials and prepared deionized water into the material-liquid mixing tank. After conveying the mixed liquid into the material-liquid mixing tank for a certain period of time, when the liquid level detector in the material-liquid mixing tank detects that the liquid level of the mixed liquid reaches the specified standard, the material-liquid mixing tank conveys the mixed liquid of platinum particle materials and prepared deionized water into the reaction kettle, and at the same time, start the fluorine-lined pump device;

[0015] Step 3: Convey the mixed liquid into the reaction kettle for reaction. After the reaction in the reaction kettle is completed, send the mixed materials to the material-liquid mixing tank, and at the same time, start the solid-liquid ratio detection device. When the ratio of platinum particle materials to liquid in the material-liquid mixing tank does not meet the standard, start the feeding device to add materials for secondary mixing;

[0016] Step 4: Continuously convey the mixed liquid of platinum particle materials and prepared deionized water into the material-liquid mixing tank. After conveying the mixed liquid into the material-liquid mixing tank for a certain period of time, when the liquid level detector in the material-liquid mixing tank detects that the liquid level of the mixed liquid reaches the specified standard, the material-liquid mixing tank conveys the mixed liquid of platinum particle materials and prepared deionized water into the crusher;

[0017] Step 5: After conveying the mixed liquid of platinum particle materials and prepared deionized water into the crusher for a certain period of time, stop conveying the mixed liquid. At the same time, after confirming that the equipment status is good and the parameters are set correctly, start the crusher for crushing operation;

[0018] After the crusher is started, pay attention to its running status to ensure that the blade rotates smoothly without abnormal vibration or noise. During the crushing process, it is necessary to judge whether the crushing effect meets the expectation by observing indicators such as the feeding speed of the suspension, the vibration of the crusher, and the particle size of the discharged material. Conduct continuous crushing for 0.3 - 3 hours, and stop for 2 minutes to cool down and observe and record every 10 minutes. During the crushing process, add water to the crusher in time;

[0019] Step 7: After the internal crushing process of the crusher is completed, send the crushed materials into the reaction kettle for secondary reaction, and at the same time, conduct mixing and stirring inside the reaction kettle. After the reaction in the reaction kettle is completed, send the mixed materials to the crusher for secondary crushing, and add water in time.

[0020] A process for a system of mechanically obtaining micro-nano platinum particles, the material drying and screening stage includes the following steps:

[0021] Step 1: Quickly convey the platinum particle suspension crushed in the crusher to the suspension filter, and then convey it to the low-temperature vacuum dryer through the suspension filter. In the low-temperature vacuum dryer, control the temperature between 60 - 90 °C;

[0022] Step 2: Turn on the vacuum pump and conduct low-temperature vacuum drying treatment on the suspension. The drying time is adjusted according to the concentration of the suspension and the performance of the low-temperature vacuum dryer. The drying time is generally 0.3 - 3 hours. During the drying process, pay attention to the operating status of the low-temperature vacuum dryer and the drying condition of the platinum particles to ensure that the platinum particles can be dried evenly and sufficiently.

[0023] Step 3: Transport the platinum raw material after drying in Step 2 to a tube furnace for heat treatment. During the heat treatment process, control the temperature of the tube furnace at about 500°C, the reaction time of the heat treatment is about 3 hours, and introduce hydrogen as the reaction gas.

[0024] Step 4: After the heat treatment is completed, take out the platinum particles from the tube furnace and immediately conduct cooling treatment. During the cooling process, it is necessary to ensure that the platinum particles will not crack or deform due to rapid temperature changes. After cooling, collect the platinum particles.

[0025] Step 5: Feed the platinum particles made in Step 14 into a grinding machine. During the grinding process, closely observe the status of the workpiece and the grinding medium to ensure that the grinding effect meets the expectations and break the platinum metal flakes into particles.

[0026] Step 6: Input the qualified particle size materials after being processed by the grinding machine into a screening machine. The screening machine will conduct further screening on the materials. The materials larger than the particle size requirement will be returned to the grinding machine for reprocessing, while the materials with qualified particle size will enter the next processing step.

[0027] When the present invention works, select high-quality and high-purity platinum metal flakes as the starting raw materials. Use a blade-type cutting machine to precisely cut the platinum metal sheet raw materials into strips with a width of 1.8 - 3 mm. Put the cut materials together with several groups of crucibles into a liquid nitrogen storage tank, cool to -196°C and maintain for 0.3 - 3 hours to reduce the temperature of the materials, making them easier to process in the subsequent crushing process and reducing the influence of the heat generated by crushing on the material properties. At the same time, prepare crushers with different powers and set the platinum metal sheet raw materials and crushers in one-to-one correspondence according to the properties of the materials and processing requirements to ensure the uniformity of the crushing effect.

[0028] Through the reverse osmosis electrodeionization device system, conduct multi-stage filtration and deionization treatment on the raw water to remove ions, impurities and microorganisms in the water. The prepared deionized water will be used for mixing with the platinum particle materials.

[0029] In the material-liquid mixing bin, mix the weighed platinum particle materials with the prepared deionized water. By adjusting the flow regulating valve and the flow meter, precisely control the liquid flow rate and mixing ratio to ensure that the concentration of the suspension reaches the predetermined requirements. During the mixing process, use a stirrer for sufficient stirring to ensure that the platinum particles are evenly distributed in the suspension.

[0030] Continuously transport the mixed liquid of platinum particle material and prepared deionized water into the material-liquid mixing tank. When the liquid level of the mixed liquid reaches the specified standard, the material-liquid mixing tank transports the mixed liquid into the reaction kettle and starts the fluorine-lined pump device; in the reaction kettle, the mixed liquid reacts. After the reaction is completed, the mixed material is sent to the material-liquid mixing tank for secondary treatment. When the ratio of platinum particle material to liquid in the material-liquid mixing tank does not meet the standard, start the feeding device to add materials for secondary mixing.

[0031] Continuously transport the mixed liquid of platinum particle material and prepared deionized water into the material-liquid mixing tank. After transporting the mixed liquid into the material-liquid mixing tank for a certain period of time, when the liquid level detector in the material-liquid mixing tank detects that the liquid level of the mixed liquid reaches the specified standard, the material-liquid mixing tank transports the mixed liquid of platinum particle material and prepared deionized water into the crusher for timely water replenishment.

[0032] After transporting the mixed liquid of platinum particle material and prepared deionized water into the crusher for a certain period of time, stop transporting the mixed liquid. At the same time, after confirming that the equipment status is good and the parameters are set correctly, start the crusher for crushing operation. Send the crushed material into the reaction kettle for secondary reaction. At the same time, mixing and stirring are carried out inside the reaction kettle. After the reaction in the reaction kettle is completed, send the mixed material to the crusher for secondary crushing and timely water replenishment.

[0033] After reaction and crushing treatment, the material is transported to a suspension filter for filtration to remove impurities and particles therein. The filtered suspension is transported to a low-temperature vacuum dryer for drying treatment. During the drying process, the system controls parameters such as temperature and time to ensure that the platinum particles can be dried evenly and sufficiently; after drying is completed, the material is transported to a tube furnace for heat treatment; during the heat treatment process, the system controls parameters such as the temperature and time of the tube furnace to make the material react and crystallize under specific conditions; after heat treatment is completed, the material is taken out and cooled. During the cooling process, the system strictly controls parameters such as the cooling rate and temperature to prevent the material from cracking or deforming due to rapid temperature changes; finally, the ground material is input into a screening machine for screening treatment. The screening machine classifies the material according to the particle size. Materials larger than the particle size requirement are returned to the grinder for reprocessing, while materials with qualified particle size enter the next step of processing.

[0034] The beneficial effects of the present invention are as follows: The present invention provides a system and process for obtaining micro-nano platinum particles by a mechanical method. The beneficial effects of the invention are specifically reflected in the following aspects:

[0035] Guarantee of high quality and purity:

[0036] By selecting high-quality and high-purity platinum metal sheets as the starting materials and through strict shredding, sorting, and subsequent processing, the purity and quality of the final product are ensured, meeting the high requirements for platinum metal in high-end application fields.

[0037] Precise control and optimization of processing:

[0038] A variety of precise control technologies are adopted in the entire process flow. For example, flow control valves and flow meters are used to precisely control the mixing ratio, liquid level detectors are used to monitor the liquid level of the mixed liquid, and solid-liquid ratio detection devices are used to ensure that the ratio of materials to liquid meets the standards. These precise control measures optimize the processing process and improve the stability and consistency of the product.

[0039] Efficient reaction and crushing:

[0040] Through the periodic operation of the reaction kettle and crusher, as well as the reasonable setting of mixing, reaction, and crushing times, the reaction efficiency and crushing effect are improved. At the same time, water is timely added to the crusher during the crushing process to ensure the smooth progress of the crushing process and the full crushing of the materials.

[0041] Environmental protection and sustainable development:

[0042] An electrodialysis reversal device system is used to prepare deionized water, reducing the impact of ions, impurities, and microorganisms in water on platinum metal. At the same time, wastewater discharge is also reduced, which is beneficial to environmental protection. In addition, the entire process flow pays attention to the recycling of resources and the treatment of waste materials, meeting the requirements of sustainable development.

[0043] Improving production efficiency and reducing costs:

[0044] Through reasonable process flow design and equipment configuration, production efficiency is improved and processing costs are reduced. For example, through the coordinated use of grinders and sieves, fine processing and effective recovery of materials are achieved, reducing the generation of waste materials and waste of resources.

[0045] Product performance improvement:

[0046] After being processed through steps such as heat treatment, cooling, grinding, and sieving, the performance of platinum particles is significantly improved. Hydrogen is introduced as a reaction gas during the heat treatment process, which helps to improve the microstructure and performance of platinum particles. At the same time, the grinding and sieving steps ensure that the particle size of the final product meets the requirements, improving the uniformity and consistency of the product. Description of the drawings

[0047] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the drawings:

[0048] Figure 1 It is the device flow chart of the material preparation stage of the present invention.

[0049] Figure 2 This is the device flow chart of the material reaction and crushing stage of the present invention.

[0050] Figure 3 This is the device flow chart of the material drying and screening stage of the present invention.

[0051] Figure 4 Pt platinum particle display under a scanning electron microscope magnified 2000 times after crushing Figure Four , and nanoparticles smaller than 1 micron can be seen.

[0052] Figure 5 Pt platinum particle display under a scanning electron microscope magnified 2000 times after crushing Figure Five , and nanoparticles smaller than 1 micron can be seen.

[0053] Figure 6 Pt platinum particle display under a scanning electron microscope magnified 3000 times after crushing Figure Six , and nanoparticles smaller than 1 micron can be seen.

[0054] Figure 7 This is the performance curve graph of the water electrolysis cell made with the crushed platinum particles as the catalyst.

[0055] Figure 8 This is the analysis result of the scanning electron microscope combined with EDX of the crushed platinum particles, indicating that the prepared platinum particles are platinum-iron alloy particles and the color is blue.

[0056] Among them, 1 is the blade cutting machine, 2 is the spiral vibrating screen, 3 is the crucible, 4 is the reverse osmosis electrodeionization device system, 5 is the liquid nitrogen storage tank, 6 is the material-liquid mixing bin, 7 is the reaction kettle, 8 is the crusher, 9 is the suspension filter, 10 is the low-temperature vacuum dryer, 11 is the tubular furnace, 12 is the grinder, and 13 is the screening machine. Specific embodiments

[0057] In order to enable those skilled in the art to better understand the technical solutions in this application, the following combines the attached Figure 1-8 to further describe the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0058] Such as Figure 1-8A system for obtaining micro-nano platinum particles by mechanical method as shown, including a production system. The production system includes a blade cutting machine 1, which is connected by a pipeline to a spiral vibrating screen 2. The spiral vibrating screen 2 is cooperatively provided with a crucible 3 for storing materials. The production system is also cooperatively provided with a reverse osmosis electrodeionization device system 4. The crucible 3 is cooperatively provided with a liquid nitrogen storage tank 5 and a material-liquid mixing tank 6. The material-liquid mixing tank 6 is cooperatively provided with a reaction kettle 7. The material-liquid mixing tank 6 is connected by a pipeline to a crusher 8. The crusher 8 is cooperatively provided with a suspension filter 9. The suspension filter 9 is connected to a low-temperature vacuum dryer 10. The low-temperature vacuum dryer 10 is connected to a tubular furnace 11. The tubular furnace 11 is cooperatively provided with a grinder 12. A screening machine 13 is provided on one side of the grinder 12.

[0059] A process for a system for obtaining micro-nano platinum particles by mechanical method. The process of the system includes a material preparation stage, a material reaction and crushing stage, and a material drying and screening stage. The material preparation stage includes the following steps:

[0060] Step 1: Select high-quality and high-purity platinum metal sheets as the starting materials, ensure no cracks and inclusions, and maintain high surface finish. Cut the platinum metal sheet raw materials into strips with a width of 1.8 - 3 mm by a blade cutting machine. After the cutting is completed, the materials are weighed and then sorted by the spiral vibrating screen 2 and transported into different crucibles 3 for the next processing step;

[0061] Step 2: Put the materials together with several groups of crucibles 3 into the liquid nitrogen storage tank 5 and cool them to -196 °C and keep for 0.3 - 3 h. At the same time, prepare crushers 8 with different powers. The crushing process adopts a periodic operation, with a cycle of 3 hours, each crushing lasting for 10 minutes, and then stopping for 2 minutes to avoid overheating of the equipment and excessive crushing of the materials. Set the platinum metal sheet raw materials and the crushers 8 in one-to-one correspondence;

[0062] Step 3: Through the reverse osmosis electrodeionization device system 4, perform multi-stage filtration and deionization treatment on the raw water to remove ions, impurities, and microorganisms in the water, and make the raw water into deionized water through the reverse osmosis electrodeionization device system 4.

[0063] A process for a system for obtaining micro-nano platinum particles by mechanical method. The material reaction and crushing stage includes the following steps:

[0064] Step 1: In the material-liquid mixing tank 6, mix the weighed platinum particle materials with the prepared deionized water. By adjusting the flow regulating valve and the flow meter, accurately control the flow rate and mixing ratio of the liquid to ensure that the concentration of the suspension reaches the predetermined requirements. During the mixing process, use a stirrer for sufficient stirring to ensure that the platinum particles are evenly distributed in the suspension;

[0065] Step 2: Continuously transport the mixed solution of platinum particle material and prepared deionized water into the material-liquid mixing tank 6. After transporting the mixed solution into the material-liquid mixing tank 6 for a certain period of time, when the liquid level detector in the material-liquid mixing tank 6 detects that the liquid level of the mixed solution reaches the specified standard, the material-liquid mixing tank 6 transports the mixed solution of platinum particle material and prepared deionized water into the reaction kettle 7, and at the same time, start the fluorine-lined pump device;

[0066] Step 3: Transport the mixed solution into the reaction kettle 7 for reaction. After the reaction in the reaction kettle 7 is completed, send the mixed material to the material-liquid mixing tank 6, and at the same time, start the solid-liquid ratio detection device. When the ratio of platinum particle material to liquid in the material-liquid mixing tank 6 does not meet the standard, start the feeding device to add materials for secondary mixing;

[0067] Step 4: Continuously transport the mixed solution of platinum particle material and prepared deionized water into the material-liquid mixing tank 6. After transporting the mixed solution into the material-liquid mixing tank 6 for a certain period of time, when the liquid level detector in the material-liquid mixing tank 6 detects that the liquid level of the mixed solution reaches the specified standard, the material-liquid mixing tank 6 transports the mixed solution of platinum particle material and prepared deionized water into the crusher 8;

[0068] Step 5: After transporting the mixed solution of platinum particle material and prepared deionized water into the crusher 8 for a certain period of time, stop transporting the mixed solution. At the same time, after confirming that the equipment status is good and the parameters are set correctly, start the crusher 8 for crushing operation;

[0069] Step 6: After the crusher 8 is started, pay attention to its operating status to ensure that the blade rotates smoothly without abnormal vibration or noise. During the crushing process, it is necessary to judge whether the crushing effect meets the expectation by observing indicators such as the feeding speed of the suspension, the vibration of the crusher 8, and the particle size of the discharged material. Carry out continuous crushing for 0.3 - 3h, and stop the machine for 2min to cool down and observe and record every 10min. During the crushing process, replenish water to the crusher 8 in time;

[0070] Step 7: After the internal crushing process of the crusher 8 is completed, send the crushed material into the reaction kettle 7 for secondary reaction, and at the same time, carry out mixing and stirring inside the reaction kettle 7. After the reaction in the reaction kettle 7 is completed, send the mixed material to the crusher 8 for secondary crushing and replenish water in time.

[0071] A process for a system of obtaining micro-nano platinum particles by mechanical method, the material drying and screening stage includes the following steps:

[0072] Step 1: Quickly transport the platinum particle suspension crushed in the crusher 8 to the suspension filter 9, and then transport it to the low-temperature vacuum dryer 10 through the suspension filter 9. Inside the low-temperature vacuum dryer 10, control the temperature between 60 - 90°C;

[0073] Step 2: Turn on the vacuum pump and conduct low-temperature vacuum drying on the suspension. The drying time is adjusted according to the concentration of the suspension and the performance of the low-temperature vacuum dryer 10. Generally, the drying time is 0.3 - 3 hours. During the drying process, pay attention to the operating state of the low-temperature vacuum dryer 10 and the drying condition of the platinum particles to ensure that the platinum particles can be dried evenly and sufficiently;

[0074] Step 3: Feed the platinum raw material after drying in Step 2 into the tubular furnace 11 for heat treatment. During the heat treatment process, control the temperature of the tubular furnace 11 at about 500 °C, the reaction time of the heat treatment is about 3 hours, and hydrogen is introduced as the reaction gas;

[0075] Step 4: After the heat treatment is completed, take out the platinum particles from the tubular furnace 11 and immediately conduct a cooling treatment. During the cooling process, it is necessary to ensure that the platinum particles will not crack or deform due to rapid temperature changes. After cooling, collect the platinum particles;

[0076] Step 5: Feed the platinum particles made in Step 4 into the grinding machine 12. During the grinding process, closely observe the states of the workpiece and the grinding medium to ensure that the grinding effect meets the expectations and break the platinum metal flakes into particles;

[0077] Step 6: Input the qualified particle size materials after being processed by the grinding machine 12 into the screening machine 13. The screening machine 13 will conduct further screening on the materials. The materials larger than the particle size requirement will be returned to the grinding machine 12 for reprocessing, while the materials with qualified particle sizes will enter the next processing step.

[0078] When the present invention works, high-quality and high-purity platinum metal flakes are selected as the starting raw materials. The metal platinum sheet raw materials are precisely cut into strips with a width of 1.8 - 3 mm using a blade-type cutting machine. The cut materials and several groups of crucibles 3 are placed in the liquid nitrogen storage tank 5, cooled to -196 °C and maintained for 0.3 - 3 hours to reduce the temperature of the materials, making them easier to process in the subsequent crushing process and at the same time reducing the influence of the heat generated by crushing on the material properties; at the same time, prepare crushers 8 with different powers, and set the metal platinum sheet raw materials and the crushers 8 in one-to-one correspondence according to the properties of the materials and the processing requirements to ensure the uniformity of the crushing effect.

[0079] Through the reverse osmosis electrodeionization device system 4, the raw water is subjected to multi-stage filtration and deionization treatment to remove ions, impurities, and microorganisms in the water. The prepared deionized water will be used for mixing with the platinum particle materials.

[0080] In the material-liquid mixing tank 6, the weighed platinum particle material is mixed with the prepared deionized water. By adjusting the flow regulating valve and the flowmeter, the flow rate and mixing ratio of the liquid are precisely controlled to ensure that the concentration of the suspension reaches the predetermined requirements. During the mixing process, a stirrer is used for sufficient stirring to ensure that the platinum particles are evenly distributed in the suspension.

[0081] The mixed liquid of platinum particle material and prepared deionized water is continuously fed into the material-liquid mixing tank 6. When the liquid level of the mixed liquid reaches the specified standard, the material-liquid mixing tank 6 feeds the mixed liquid into the reaction kettle 7 and starts the fluorine-lined pump device. In the reaction kettle 7, the mixed liquid reacts. After the reaction is completed, the mixed material is sent to the material-liquid mixing tank 6 for secondary treatment. When the ratio of platinum particle material to liquid in the material-liquid mixing tank 6 does not meet the standard, the feeding device is started to add materials for secondary mixing.

[0082] The mixed liquid of platinum particle material and prepared deionized water is continuously fed into the material-liquid mixing tank 6. After feeding the mixed liquid into the material-liquid mixing tank 6 for a certain period of time, when the liquid level detector in the material-liquid mixing tank 6 detects that the liquid level of the mixed liquid reaches the specified standard, the material-liquid mixing tank 6 feeds the mixed liquid of platinum particle material and prepared deionized water into the crusher 8 for timely water replenishment.

[0083] After feeding the mixed liquid of platinum particle material and prepared deionized water into the crusher 8 for a certain period of time, the feeding of the mixed liquid is stopped. At the same time, after confirming that the equipment status is good and the parameters are set correctly, the crusher 8 is started for crushing operation. The crushed material is sent into the reaction kettle 7 for secondary reaction. At the same time, mixing and stirring are carried out inside the reaction kettle 7. When the reaction in the reaction kettle 7 is completed, the mixed material is sent to the crusher 8 for secondary crushing and timely water replenishment.

[0084] After reaction and crushing treatment, the material is transported to the suspension filter 9 for filtration treatment to remove impurities and particles therein. The filtered suspension is transported to the low-temperature vacuum dryer 10 for drying treatment. During the drying process, the system controls parameters such as temperature and time to ensure that the platinum particles can be dried evenly and sufficiently. After drying is completed, the material is transported to the tubular furnace 11 for heat treatment. During the heat treatment process, the system controls parameters such as the temperature and time of the tubular furnace 11 to make the material react and crystallize under specific conditions. After heat treatment is completed, the material is taken out and cooled. During the cooling process, the system strictly controls parameters such as the cooling rate and temperature to prevent the material from cracking or deforming due to rapid temperature changes. Finally, the ground material is input into the screening machine 13 for screening treatment. The screening machine 13 classifies the material according to the particle size. The material larger than the particle size requirement is returned to the grinder 12 for reprocessing, while the material with qualified particle size enters the next step of processing.

[0085] Example 1:

[0086] The working process of the present invention is as follows: Prepare shredded 99.999% metallic platinum sheet raw materials and weigh them, marked as 99.999% metallic platinum sheet raw material A, with a weight of 2 g and shredded into long narrow platinum sheets 2 mm wide.

[0087] Then place the long narrow platinum sheets in an iron crucible 3 and put them into a liquid nitrogen storage tank 5 to cool to -196°C and hold for 0.5 h to improve its cold brittleness. Prepare and mark a crusher 8a with a power of 200 W (W is in uppercase).

[0088] Set the 99.999% metallic platinum sheet raw material A and the crusher 8a correspondingly; then add a certain amount of deionized water to the crusher 8a, and immediately put 2 g of 99.999% (with intervals) metallic platinum sheet raw material A into the crusher 8a for water-containing crushing to ensure that the deionized water completely submerges the 99.999% metallic platinum sheet raw material A, so as to avoid generating platinum particle smoke.

[0089] Use the crusher 8a to continuously crush the 99.999% metallic platinum sheet raw material for 1 h. The 1 h does not include the time for cooling the machine, and it stops for 2 min every 10 min for cooling and observation and recording.

[0090] After the crushing is completed, filter the platinum black-containing suspension in the crusher 8a to form a new raw material A1, and record the data in real time.

[0091] Use a vacuum dryer at 80°C for drying; continue drying for 1 h; place the platinum particles in a tubular furnace 11 for heat treatment in a hydrogen atmosphere at 500°C for 2 h; after completion, grind and sieve to obtain raw material A1 with an average particle size of 30 microns and a weight of 1.95 g.

[0092] The fine particles that meet the requirements formed in this way are reserved as platinum black catalysts for standby.

[0093] Example 2:

[0094] The working process of the present invention is as follows: Prepare shredded 99.999% metallic platinum sheet raw materials and weigh them, marked as 99.999% metallic platinum sheet raw material B, with a weight of 2 g and shredded into long narrow platinum sheets 2 mm wide, and put them into a liquid nitrogen storage tank 5 to cool to -196°C and hold for 1 h to improve its cold brittleness.

[0095] Prepare a 200w crusher 8 and label it as b, where 99.999% of the metal platinum sheet raw material B corresponds to the crusher 8b; then add a certain amount of deionized water to the crusher 8b, put 2g of 99.999% of the metal platinum sheet raw material B into the crusher 8b for water-containing crushing and ensure that the deionized water completely submerges the 99.999% of the metal platinum sheet raw material B, so as to avoid the generation of platinum particle smoke;

[0096] Use the crusher 8b to continuously crush 99.999% of the metal platinum sheet raw material for 1h. The 1h does not include the cooling machine time, and stop for 2min to cool and observe and record every 10min;

[0097] After the crushing is completed, filter the platinum black-containing suspension in the crusher 8b respectively to form a new raw material A2, and record the data in real time;

[0098] Use a vacuum dryer at 80°C for drying; continue drying for 1h; place the platinum particles in a tubular furnace 11 for heat treatment at 500°C in a hydrogen atmosphere for 2h; after completion, grind and sieve to obtain 1.92g of raw material A2 with an average particle size of 25 microns;

[0099] The fine particles that meet the requirements formed in this way are reserved for use as platinum black catalysts.

[0100] Example 3:

[0101] The working process of the present invention is as follows: Prepare and weigh the cut 99.999% metal platinum sheet raw materials respectively, label them as 99.999% metal platinum sheet raw material C, with a weight of 2g and cut into long narrow platinum sheets 2mm wide, and put them into the liquid nitrogen storage tank 5 to cool to -196°C and keep for 1.5h to improve its cold brittleness,

[0102] Prepare and label the crusher 8c respectively, with a power of 200w,

[0103] 99.999% of the metal platinum sheet raw material C corresponds to the crusher 8c; then add a certain amount of deionized water to the crusher 8c, put 2g of 99.999% of the metal platinum sheet raw material C into the crusher 8c for water-containing crushing and ensure that the deionized water completely submerges the 99.999% of the metal platinum sheet raw material C, so as to avoid the generation of platinum particle smoke;

[0104] Use the crusher 8c to continuously crush 99.999% of the metal platinum sheet raw material for 1h. The 1h does not include the cooling machine time, and stop for 2min to cool and observe and record every 10min;

[0105] After the crushing is completed, filter the platinum black-containing suspension in the crusher 8c respectively to form a new raw material A3, and record the data in real time;

[0106] Dry using a vacuum dryer at 80 °C; continue drying for 1 h; place the platinum particles in a tube furnace 11 and heat-treat them in a hydrogen atmosphere at 500 °C for 2 h; after completion, grind and sieve to obtain 1.9 g of raw material A3 with an average particle size of 20 microns;

[0107] The fine particles that meet the requirements formed in this way are reserved for use as a platinum black catalyst.

[0108] Example 4:

[0109] The working process of the present invention is as follows: Prepare and weigh the shredded 99.999% metallic platinum sheet raw material separately, mark it as the 99.999% metallic platinum sheet raw material D, with a weight of 2 g and shredded into long narrow platinum sheets with a width of 2 mm, and place them in a liquid nitrogen storage tank 5 and cool to -196 °C for 2 h to improve its cold brittleness.

[0110] Prepare and mark the crusher 8d separately, with a power of 200 w.

[0111] The 99.999% metallic platinum sheet raw material D and the crusher 8d are correspondingly arranged; then add a certain amount of deionized water to the crusher 8d, put 2 g of the 99.999% metallic platinum sheet raw material D into the crusher 8d for water-containing crushing and ensure that the deionized water completely submerges the 99.999% metallic platinum sheet raw material D, so as to avoid generating platinum particle smoke.

[0112] Use the crusher 8d to continuously crush the 99.999% metallic platinum sheet raw material for 1 h, without including the cooling machine time during the 1 h, and stop the machine for 2 min to cool and observe and record every 10 min.

[0113] After the crushing is completed, filter the platinum black-containing suspension in the crusher 8d to form a new raw material A4, and record the data in real time.

[0114] Dry using a vacuum dryer at 80 °C; continue drying for 1 h; place the platinum particles in a tube furnace 11 and heat-treat them in a hydrogen atmosphere at 500 °C for 2 h; after completion, grind and sieve to obtain 1.9 g of raw material A4 with an average particle size of 20 microns.

[0115] The fine particles that meet the requirements formed in this way are reserved for use as a platinum black catalyst.

[0116] Example 5:

[0117] The working process of the present invention is as follows: Prepare and weigh the shredded 99.999% metallic platinum sheet raw material separately, mark it as the 99.999% metallic platinum sheet raw material E, with a weight of 2 g and shredded into long narrow platinum sheets with a width of 2 mm, and place them in liquid nitrogen and cool to -196 °C for 1.5 h to improve its cold brittleness.

[0118] Prepare and label crusher e separately, with a power of 500w,

[0119] The 99.999% platinum metal sheet raw material E and crusher e are set correspondingly; then add a certain amount of deionized water to crusher e, put 2g of 99.999% platinum metal sheet raw material E into crusher e for water-containing crushing and ensure that the deionized water completely submerges the 99.999% platinum metal sheet raw material E, so as to avoid generating platinum particle smoke;

[0120] Use crusher e to continuously crush the 99.999% platinum metal sheet raw material for 1h, without cooling machine time in 1h, and stop for 2min to cool and observe and record every 10min;

[0121] After the crushing is completed, filter the platinum black-containing suspension in crusher e to form a new raw material A5, and record the data in real time;

[0122] Use a vacuum dryer at 80°C for drying; continue drying for 1h; place the platinum particles in a tubular furnace and heat-treat them in a hydrogen atmosphere at 500°C for 2h; after completion, grind and sieve to obtain 1.89g of raw material A5 with an average particle size of 15 microns;

[0123] The fine particles that meet the requirements formed in this way are reserved for use as a platinum black catalyst.

[0124] Example 6:

[0125] The working process of the present invention is: separately prepare the cut 99.999% platinum metal sheet raw material and weigh it, label it as 99.999% platinum metal sheet raw material F, with a weight of 2g and cut into long narrow platinum sheets 2mm wide, and put them into liquid nitrogen to cool to -196°C and keep for 1.5h to improve its cold brittleness,

[0126] Prepare and label crusher f separately, with a power of 500w,

[0127] The 99.999% platinum metal sheet raw material F and crusher f are set correspondingly; then add a certain amount of deionized water to crusher f, put 2g of 99.999% platinum metal sheet raw material F into crusher f for water-containing crushing and ensure that the deionized water completely submerges the 99.999% platinum metal sheet raw material F, so as to avoid generating platinum particle smoke;

[0128] Use crusher f to continuously crush the 99.999% platinum metal sheet raw material for 1.5h, without cooling machine time in 1.5h, and stop for 2min to cool and observe and record every 10min;

[0129] After the crushing is completed, the suspension containing platinum black in crusher f is filtered separately to form a new raw material A6, and data is recorded in real time;

[0130] It is dried using a vacuum dryer at 80 °C; the drying is continued for 1 h; the platinum particles are placed in a tubular furnace and heat-treated in a hydrogen atmosphere at 500 °C for 2 h; after completion, it is ground and sieved to obtain 1.88 g of raw material A6 with an average particle size of 13 microns;

[0131] The fine particles that meet the requirements formed in this way are reserved for use as a platinum black catalyst.

[0132] Example VII:

[0133] The working process of the present invention is as follows: Prepare and weigh the cut 99.999% metallic platinum sheet raw material separately, mark it as the 99.999% metallic platinum sheet raw material G, with a weight of 2 g and cut into long narrow platinum sheets 2 mm wide, and place it in liquid nitrogen to cool to -196 °C and hold for 1.5 h to improve its cold brittleness,

[0134] Prepare and mark crusher g separately, with a power of 500 w,

[0135] The 99.999% metallic platinum sheet raw material G and crusher g are correspondingly set; then a certain amount of deionized water is added to crusher g, and 2 g of the 99.999% metallic platinum sheet raw material G is put into crusher g for water-containing crushing to ensure that the deionized water completely submerges the 99.999% metallic platinum sheet raw material G, so as to avoid generating platinum particle smoke;

[0136] Use crusher g to continuously crush the 99.999% metallic platinum sheet raw material for 2 h. The 2 h does not include the cooling machine time, and it stops for 2 min of cooling and observation and recording every 10 min;

[0137] After the crushing is completed, the suspension containing platinum black in crusher g is filtered separately to form a new raw material A7, and data is recorded in real time;

[0138] It is dried using a vacuum dryer at 80 °C; the drying is continued for 1 h; the platinum particles are placed in a tubular furnace and heat-treated in a hydrogen atmosphere at 500 °C for 2 h; after completion, it is ground and sieved to obtain 1.87 g of raw material A7 with an average particle size of 10 microns;

[0139] The fine particles that meet the requirements formed in this way are reserved for use as a platinum black catalyst.

[0140] Example VIII:

[0141] The working process of the present invention is as follows: Prepare shredded 99.999% metallic platinum sheet raw materials separately and weigh them, marked as 99.999% metallic platinum sheet raw material H, with a weight of 2 g and shredded into long narrow platinum sheets 2 mm wide, and place them in liquid nitrogen to cool to -196 °C and hold for 1.5 h to improve their cold brittleness.

[0142] Prepare and mark crusher h separately, with a power of 500 w.

[0143] The 99.999% metallic platinum sheet raw material H and crusher h are set correspondingly; then add a certain amount of deionized water to crusher h, and put 2 g of 99.999% metallic platinum sheet raw material H into crusher h for water-containing crushing to ensure that the deionized water completely submerges the 99.999% metallic platinum sheet raw material H, so as to avoid generating platinum particle smoke.

[0144] Use crusher h to continuously crush the 99.999% metallic platinum sheet raw material for 2.5 h. The 2.5 h does not include the time for cooling the machine, and it stops for 2 min to cool and observe and record every 10 min.

[0145] After the crushing is completed, filter the platinum black-containing suspension in crusher h to form a new raw material A8, and record the data in real time.

[0146] Use a vacuum dryer at 80 °C for drying; continue drying for 1 h; place the platinum particles in a tube furnace and heat-treat them in a hydrogen atmosphere at 500 °C for 2 h; after completion, grind and sieve to obtain 1.87 g of raw material A8 with an average particle size of 10 microns.

[0147] The fine particles that meet the requirements formed in this way are reserved for use as a platinum black catalyst.

[0148] In the above Examples 1, 2, 3, and 4, when the power of the crusher is 200 w and the weight of the 99.999% metallic platinum sheet raw material is 2 g, the holding time after cooling to -196 °C in liquid nitrogen increases from 0.5 h to 1.5 h in sequence. After crushing, filtering, and drying, the average particle size of the obtained platinum particles is smaller and ranges between 30 μm and 20 μm, and at the same time, the loss is greater, and the weight of the obtained fine platinum particles decreases from 1.95 g to 1.92 g; when the holding time after cooling to -196 °C in liquid nitrogen is from 1.5 h to more than 2 h, the particle size of the obtained platinum particles is 20 μm, and the weight is 1.9 g. From this, it can be concluded that Example 3 among Examples 1, 2, 3, and 4 is the best solution.

[0149] In the above Embodiment 5, Embodiment 6, Embodiment 7 and Embodiment 8, when the power of the crusher is 500w and the weight of 99.999% of the raw material of the platinum sheet is 2g, the time of maintaining the temperature at -196°C after cooling in liquid nitrogen remains unchanged, which is 1.5h. The crushing time is gradually increased from 1h to 2h, and after filtration and drying, the average particle size of the obtained platinum particles is smaller and ranges between 15um - 10um. At the same time, the loss is greater, and the weight of the obtained fine platinum particles decreases from 1.89g to 1.87g. When the crushing time is further increased from 2h to more than 2.5h, and after filtration and drying, the average particle size of the obtained platinum particles is 10um, and the weight is 1.87g. It is concluded that in Embodiment 5, Embodiment 6, Embodiment 7 and Embodiment 8, Embodiment 7 is the best solution.

[0150] Comparing the two solutions of the above Embodiment 3 and Embodiment 7, the greater the power of the crusher, the smaller the average particle size of the obtained platinum particles, and the greater the loss. When platinum particles with an average particle size of 20 microns are required, Embodiment 3 is the best solution. When platinum particles with an average particle size of 10um are required, Embodiment 7 is the best solution.

[0151] Take any of the platinum particles obtained from the above Embodiment 3 and Embodiment 7 as a catalyst and assemble it into a 22cm 2 PEM electrolyzer, and the performance curve of the obtained electrolyzer is as Figure 4 shown.

[0152] The present invention is not limited to the above embodiments. Based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and deformations to some technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A system for obtaining micro-nano platinum particles by mechanical method, comprising a production system, characterized in that: The production system comprises a blade cutting machine (1), the blade cutting machine (1) is provided with a spiral vibrating screen (2) via a pipeline, the spiral vibrating screen (2) is provided with a crucible (3) for storing materials, the production system is further provided with a reverse osmosis electrodeionization device system (4), the crucible (3) is provided with a liquid nitrogen storage tank (5) and a material-liquid mixing chamber (6), the material-liquid mixing chamber (6) is provided with a reaction kettle (7), the material-liquid mixing chamber (6) is provided with a crusher (8) via a pipeline, the crusher (8) is provided with a suspension filter (9), the suspension filter (9) is connected to a low-temperature vacuum dryer (10), the low-temperature vacuum dryer (10) is provided with a tubular furnace (11), the tubular furnace (11) is provided with a grinder (12), and a sieving machine (13) is provided on one side of the grinder (12); The process of the system includes a material preparation stage, a material reaction and crushing stage, and a material drying and screening stage. The material preparation stage includes the following steps: Step 1: Select high-quality, high-purity platinum metal flakes as the starting material, ensure that there are no cracks or inclusions, and maintain a high surface finish. Cut the metal platinum flakes into strips with a width of 1.8-3 mm using a blade cutter. After the cutting is completed, the material is weighed and sorted through a spiral vibrating screen (2) and then transported to different crucibles (3) for the next step of processing; Step 2: Place the material together with several groups of crucibles (3) into a liquid nitrogen storage tank (5) and cool to -196°C for 0.3-3 hours. Meanwhile, prepare crushers (8) of different powers. The crushing process is operated periodically, with a cycle of 3 hours. Each crushing lasts for 10 minutes, followed by a 2-minute stop to avoid overheating of the equipment and excessive crushing of the material. The metal platinum sheet raw material and the crusher (8) are set in a one-to-one correspondence; Step 3: The raw water is subjected to multi-stage filtration and deionization treatment by a reverse osmosis electrodeionization device system (4) to remove ions, impurities and microorganisms in the water, and the raw water is made into deionized water by passing through the reverse osmosis electrodeionization device system (4); The material reaction and crushing stage comprises the following steps: Step 1: In the material-liquid mixing chamber (6), the weighed platinum particle material is mixed with the prepared deionized water. By adjusting the flow control valve and the flow meter, the flow rate and mixing ratio of the liquid are accurately controlled to ensure that the concentration of the suspension reaches the predetermined requirements. During the mixing process, a stirrer is used to stir the suspension sufficiently to ensure that the platinum particles are evenly distributed in the suspension.

2. The process of a system for obtaining micro-nano platinum particles by mechanical method according to claim 1, characterized in that: The material reaction and crushing stage comprises the following steps: Step 1: In the material-liquid mixing chamber (6), the weighed platinum particles are mixed with the prepared deionized water, and the flow rate and mixing ratio of the liquid are accurately controlled by adjusting the flow control valve and the flow meter to ensure that the concentration of the suspension reaches the predetermined requirements. During the mixing process, a stirrer is used to stir the suspension sufficiently to ensure that the platinum particles are evenly distributed in the suspension. Step 2: continuously conveying a mixed solution of platinum particles and prepared deionized water into the material-liquid mixing chamber (6); after conveying the mixed solution into the material-liquid mixing chamber (6) for a certain period of time, a mixed solution level detector located in the material-liquid mixing chamber (6) detects that the liquid level of the mixed solution reaches a specified standard, and then the material-liquid mixing chamber (6) conveys the mixed solution of platinum particles and prepared deionized water into the reaction kettle (7), and simultaneously starts the fluorine lining pump device; Step 3: transporting the mixed liquid into a reaction kettle (7) for reaction. When the reaction in the reaction kettle (7) is completed, the mixed material is transported to a material-liquid mixing bin (6), and a solid-liquid ratio detection device is started at the same time. When the ratio of the platinum particle material to the liquid in the material-liquid mixing bin (6) does not meet the standard, a feeding device is started to add material for secondary mixing. Step 4: continuously conveying the mixed liquid of the platinum particles and the prepared deionized water into the material-liquid mixing bin (6); after conveying the mixed liquid into the material-liquid mixing bin (6) for a certain period of time, the mixed liquid level detector located in the material-liquid mixing bin (6) detects that the liquid level of the mixed liquid reaches a specified standard, and then the material-liquid mixing bin (6) conveys the mixed liquid of the platinum particles and the prepared deionized water into the crusher (8); Step 5: After a certain period of time, the mixed solution of the platinum particles and the prepared deionized water is transported into the crusher (8), the transport of the mixed solution is stopped, and after confirming that the equipment is in good condition and the parameters are set correctly, the crusher (8) is started to perform the crushing operation; Step 6: After the crusher (8) is started, pay attention to its operating status to ensure that the blades rotate smoothly without abnormal vibration or noise. During the crushing process, it is necessary to observe the feed speed of the suspension, the vibration of the crusher (8), the particle size of the output material and other indicators to determine whether the crushing effect has reached the expected level. The crushing is continued for 0.3-3 hours, and the machine is stopped for 2 minutes every 10 minutes to cool down and observe and record. During the crushing process, water is added to the crusher (8) in a timely manner; Step 7: After the crushing process inside the crusher (8) is completed, the crushed material is sent to the reactor (7) for secondary reaction. At the same time, mixing and stirring are performed inside the reactor (7). When the reaction in the reactor (7) is completed, the mixed material is sent to the crusher (8) for secondary crushing, and water is added in time.

3. The process of a system for obtaining micro-nano platinum particles by mechanical method according to claim 2, characterized in that: The material drying and screening stage comprises the following steps: Step 1: The platinum particle suspension crushed in the crusher (8) is quickly transported to the suspension filter (9), and then transported to the low-temperature vacuum dryer (10) through the suspension filter (9). In the low-temperature vacuum dryer (10), the temperature is controlled between 60-90° C.; Step 2: Turn on the vacuum pump to perform low-temperature vacuum drying on the suspension. The drying time is adjusted according to the concentration of the suspension and the performance of the low-temperature vacuum dryer (10). The drying time is generally 0.3-3 hours. During the drying process, pay attention to the operating state of the low-temperature vacuum dryer (10) and the drying state of the platinum particles to ensure that the platinum particles can be dried evenly and fully. Step 3: transporting the platinum raw material after drying in step 2 to a tubular furnace (11) for heat treatment. During the heat treatment process, the temperature of the tubular furnace (11) is controlled at about 500° C., the heat treatment reaction time is about 3 hours, and hydrogen is introduced as a reaction gas; Step 4: After the heat treatment is completed, the platinum particles are taken out from the tube furnace (11) and immediately cooled. During the cooling process, it is necessary to ensure that the platinum particles will not crack or deform due to the rapid temperature change. After cooling, the platinum particles are collected; Step 5: feeding the platinum particles prepared in step 4 into a grinder (12), and during the grinding process, closely observing the state of the workpiece and the grinding medium to ensure that the grinding effect is as expected, and breaking the platinum metal flakes into particles; Step 6: The material with a qualified particle size after being processed by the grinder (12) is input into the screening machine (13). The screening machine (13) will further screen the material. The material with a particle size larger than the required size will be returned to the grinder (12) for further processing, while the material with a qualified particle size will enter the next step of processing.

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