A process for crushing artificial diamond micropowder with high particle size distribution

Abstract

The invention relates to a process for crushing artificial diamond micropowder with high particle size distribution, comprising the following steps: 1) crushing raw diamonds in an air flow crusher, wherein the air flow crusher is provided with a primary discharge port, a secondary discharge port and a tertiary discharge port in sequence according to the air flow direction; 2) screening and grading the material at the primary discharge port to obtain coarse material, medium material, medium-fine material and fine material, with the coarse material serving as the raw material for secondary crushing; 3) screening and grading the shaped medium material again to obtain medium material, medium-fine material and fine material, with the medium material serving as the raw material for secondary crushing; 4) crushing the coarse material in step 2) and the medium material in step 3) for secondary crushing, screening and grading the material at the primary discharge port to obtain medium material, medium-fine material and fine material, with the medium material serving as the raw material for tertiary crushing; and 5) crushing the medium material in step 4) for tertiary crushing. The present invention can improve the particle size distribution of artificial diamond micropowder, improve the output rate of products with required particle size, and improve the uniformity of the product crystal form.

Description

Technical Field

[0001] The invention relates to the technical field of material preparation technology, in particular to a process for crushing artificial diamond micropowder with a single high particle size distribution. Background Art

[0002] Synthetic diamond powder is a superhard, fine grinding and polishing material widely used internationally. With the development of cutting-edge technology and high-end manufacturing, the application areas of diamond powder are expanding, and the requirements for diamond powder are becoming increasingly higher. This includes not only the requirements for diamond raw materials and crystal forms, but also the requirements for diamond powder particle size.

[0003] Different applications require different diamond powder particle sizes, leading to tight supply and rising prices for certain particle size ranges. For example, the photovoltaic industry currently requires diamond powders finer than 7 microns, while other diamond powders are not suitable for photovoltaic applications. With the advancement of photovoltaic technology, the particle size requirement is gradually decreasing, placing high demands on diamond powder companies, requiring them to improve the yield of this particle size range. Current conventional crushing technologies, even with a single-step crushing process to finer than 7 microns, only yield a maximum of around 10% of the material, with the remainder being finer than 3 microns, which is of little economic value. Therefore, it is necessary to develop a diamond powder crushing technology that achieves a high particle size distribution.

[0004] Diamond powder is a powder material. Powder materials are generally prepared by crushing coarse-grained materials. There are three basic principles for crushing coarse-grained materials to micron or submicron particle sizes: crushing, grinding, and mechanical impact, or direct collision between high-speed (9 m / s or more) moving particles. The details are as follows.

[0005] 1. Crushing method: Crushing method refers to placing the material between two working surfaces. After applying pressure, the material is crushed because the compressive stress reaches its compressive strength. This method is generally suitable for crushing large pieces of material. Due to the small particle size of single crystal diamond, the crushing method is not suitable for single crystal diamond crushing. In addition, the crushed diamond is not easy to collect. The particle shape of the crushed diamond is also difficult to control and is irregular, which is not conducive to the application of diamond powder. Therefore, the crushing method is generally not used to prepare diamond powder.

[0006] 2. Grinding: The grinding method for preparing powder materials has a long history. It is currently mainly used for the preparation of powder materials such as silicon carbide and refractory materials. It is divided into dry grinding and wet grinding. The degree of grinding is closely related to parameters such as the grinding aid, the material of the grinding balls, the diameter of the grinding balls, and the ball-to-material ratio. The cost is relatively high. Currently, there has been no research on the use of grinding machines for single crystal diamond crushing technology in the field of diamond micropowder.

[0007] 3. Mechanical Collision Method: Currently, the main mechanical collision methods used in the preparation of diamond micropowders include drum ball mills and air flow crushers. Drum ball mills are crushing devices that combine a crushing action with low-speed mechanical impact. In terms of method, drum ball mills are the most commonly used method for crushing coarse-grained single-crystal diamonds to produce diamond micropowder. Ball milling has been used in my country's diamond micropowder production for many years and has achieved relatively satisfactory results. However, drum ball mills suffer from low production efficiency and are currently being replaced by air flow crushers. Drum ball mills are primarily used for shaping fine-grained diamond micropowders. Air flow crushers use compressed air as the working medium. The compressed air is accelerated into a high-speed airflow through a Laval nozzle and injected into the crushing chamber. The high-speed airflow accelerates the diamond material in the crushing chamber, causing violent collisions between diamond particles, thereby achieving ultrafine crushing of the diamond material. The crushed diamond materials move to the classification area with the air flow, and the classifying wheel selects the materials with qualified particle size. The diamond materials with unqualified particle size return to the crushing area to continue to be crushed to the required particle size, and then are sorted out by the classifying wheel. The air flow carrying the materials enters the particle size separator for collection. Under the action of the centrifugal force generated by the rotation of the motor, the materials slide down along the cylinder wall and are discharged through the discharge port. A small part of the materials enters the dust collector with the air flow and is collected by the dust collector. The purified gas is discharged into the atmosphere. Figure 1 shown.

[0008] A jet mill uses an airflow to carry diamond materials at high speed, causing intense collisions, friction, and shearing between them to achieve pulverization. According to the kinetic energy formula, kinetic energy is proportional to mass and the square of velocity. Particle crushing occurs when the force acting on the particle exceeds its breaking stress. High-speed impact and collision cause volumetric fragmentation, while shearing and grinding produce surface fragmentation. This crushing method is highly advantageous for the production of diamond micropowders, as it allows for the production of ideal particle shapes. The greatest advantage of a jet mill is that it is not limited by mechanical linear velocity and can generate very high airflow velocities. Supersonic jet mills, in particular, can generate flow velocities several times the speed of sound, generating enormous kinetic energy and making it easier to obtain micron and submicron ultrafine powders. Based on the principle of pulverization, this type of machine has great development prospects for the production of diamond micropowders.

[0009] While air jet crushers have long been used to crush diamonds, the impact of crushing parameters on their effectiveness remains largely unresolved, with no in-depth theoretical research. Furthermore, with the continued expansion of diamond powder applications and the specialized requirements placed on diamond powder in specialized applications, higher technical requirements for diamond powder quality are being placed. Diamond powder products are produced by direct crushing of diamonds, and their quality depends on factors such as purity, crystal regularity, uniformity of particle size distribution, wear resistance, and magnetic properties.

[0010] In terms of particle size, diamond micropowder is in the micron and submicron range. Compared with raw synthetic diamond material, its specific surface area is significantly larger, thus greatly increasing the interaction force between particles during the production process. In addition, as the particle size decreases, the particle defects decrease, and the strength inevitably increases. Therefore, the production of diamond micropowder is not only a process of particle refinement, but also accompanied by changes in crystal structure and surface physical and chemical properties. The process control is quite difficult, so it is very necessary to carry out research on diamond crushing technology. Summary of the Invention

[0011] The purpose of the present invention is to improve the particle size distribution of artificial diamond micropowder by studying the diamond crushing process. The ultimate goal is to increase the discharge ratio of products with required particle size and improve the crystal regularity of the products. Based on this purpose, the present invention discloses a crushing process for artificial diamond micropowder with high particle size distribution. The specific scheme is:

[0012] A process for crushing artificial diamond micropowder with high particle size distribution comprises the following steps:

[0013] 1) The raw diamond is crushed once in an air flow crusher. The air flow crusher is provided with a primary discharge port, a secondary discharge port and a tertiary discharge port in sequence according to the air flow direction. Each discharge port is provided with a primary classifying wheel, a secondary classifying wheel and a tertiary classifying wheel. The discharge particle size of each discharge port is controlled by the frequency of each classifying wheel. The discharge particle size of the primary discharge port is controlled at D1, the discharge particle size of the secondary discharge port is controlled at D2, and the discharge particle size of the tertiary discharge port is controlled at D3, D1>D2>D3;

[0014] 2) The material at the primary discharge port is screened and graded to obtain coarse material, medium material, medium-fine material and fine material. The coarse material is used as the raw material for secondary crushing, and the remaining materials are separately subjected to airflow shaping. The shaped medium material and fine material are purified and become products; the material at the secondary discharge port is subjected to airflow shaping and purified to become products;

[0015] 3) The shaped medium material is screened and graded again to obtain medium material, medium-fine material and fine material. The medium material is used as the raw material for secondary crushing, and the medium-fine material and fine material are purified to become products;

[0016] 4) The coarse material from step 2) and the medium material from step 3) are subjected to secondary crushing, and the material at the primary discharge port is screened and graded to obtain medium material, medium-fine material, and fine material. The medium material is used as the raw material for the tertiary crushing, and the medium-fine material, fine material, and material at the secondary discharge port are subjected to airflow shaping and purification to become the product;

[0017] 5) The intermediate material in step 4) is crushed three times, and the materials at the primary and secondary discharge ports are subjected to airflow shaping and purified to become products;

[0018] In steps 2)-4), the particle size of the coarse material is greater than D1, the particle size of the medium material is [D1, D2), the particle size of the medium-fine material is [D2, D3), and the particle size of the fine material is ≤ D3.

[0019] Preferably, in steps 1), 4), and 5), the materials from the three discharge ports are all ball-milled and shaped, and purified to become products.

[0020] Preferably, in step 4), the frequency of the secondary classifying wheel during secondary crushing is increased by 5 Hz compared to that during primary crushing.

[0021] Preferably, in step 4), the frequency of the primary classifying wheel during secondary crushing is increased by 1-3 Hz compared with that during primary crushing, and the frequency of the primary classifying wheel during tertiary crushing is increased by 1-5 Hz compared with that during secondary crushing.

[0022] Preferably, when the target particle size is D0, D1 is controlled to be 1.8-2.1 times of D0, and D3 is controlled to be consistent with D0.

[0023] Specifically, the target particle size is 20-40 microns, and D1 is controlled to be 270 mesh, D2 is controlled to be 325 mesh, and D3 is controlled to be 500 mesh.

[0024] Preferably, in steps 1) to 5), the air pressure during the primary crushing is controlled at 0.4-0.6 MPa; the frequency of the first-stage classifying wheel is controlled at 8-10 Hz, the frequency of the second-stage classifying wheel is controlled at 30 Hz, and the frequency of the third-stage classifying wheel is controlled at 50 Hz;

[0025] The air pressure during secondary crushing is controlled at 0.4-0.6MPa; the frequency of the first-stage classifying wheel is controlled at 9-13Hz, the frequency of the second-stage classifying wheel is controlled at 35Hz, and the frequency of the third-stage classifying wheel is controlled at 50Hz;

[0026] The air pressure during the three crushing processes is controlled at 0.4-0.6 MPa; the frequency of the first-stage classifying wheel is controlled at 14-18 Hz, the frequency of the second-stage classifying wheel is controlled at 35 Hz, and the frequency of the third-stage classifying wheel is controlled at 50 Hz.

[0027] Preferably, in step 2), the air pressure of the medium material air flow shaping is 0.6 MPa, and the time is 50 min; the air pressure of the medium and fine material air flow shaping is 0.55 MPa, and the time is 1 hour; the air pressure of the fine material air flow shaping is 0.55 MPa, and the time is 1.5 hours; the air pressure of the material air flow shaping at the secondary discharge port is 0.55 MPa, and the time is 1.5 hours;

[0028] In step 4), the air pressure for shaping the medium and fine materials is 0.6 MPa, and the time is 30 min; the air pressure for shaping the fine materials is 0.6 MPa, and the time is 50 min; the air pressure for shaping the material air flow at the secondary discharge port is 0.55 MPa, and the time is 1.5 h;

[0029] In step 5), the pressure of the material airflow shaping at the primary discharge port is 0.55 MPa, and the time is 20 min; the pressure of the material airflow shaping at the secondary discharge port is 0.55 MPa, and the time is 30 min;

[0030] In steps 1), 4), and 5), the ball-to-material ratio of ball milling is 1:5, and the time is 72 hours.

[0031] The present invention can improve the particle size distribution of artificial diamond micropowder, increase the output rate of products with required particle size, and improve the uniformity of product crystal form. In an embodiment of the present invention, the output rate of products with required particle size is increased to more than 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and examples.

[0033] Figure 1 Schematic diagram of the crushing principle of the air flow crusher.

[0034] Figure 2 This is the particle size distribution diagram of the product obtained in Example 1.

[0035] Figure 3 This is a crystal diagram of the product obtained in Example 1. DETAILED DESCRIPTION

[0036] The present invention is described below in detail with reference to specific embodiments of the present invention. The description herein is intended only to explain the present invention and is not intended to limit the present invention. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without creative work in all other embodiments obtained by them should be included within the scope of protection of the present invention.

[0037] Example 1

[0038] The specific technical implementation plan is as follows:

[0039] Taking the synthetic diamond of 40 / 45 mesh size and grade 20 produced by a certain synthetic diamond manufacturer as the raw material, and taking the Mianyang Liuneng LNJ-60 air jet crusher (3-stage classification) as an example for illustration, the target particle size is 20-40 microns, and the highest discharge ratio in this particle size range is required.

[0040] First, the air jet crusher is described. This air jet crusher has 3 classification wheels, namely the primary classification wheel, the secondary classification wheel, and the tertiary classification wheel. The primary classification wheel controls the crushing particle size by controlling the rotation speed of the classification wheel. The secondary classification wheel classifies the crushed material by controlling the rotation speed of the classification wheel. The coarse particles fall to the discharge port (the primary discharge port, the material at this discharge port is the main discharge port with the largest proportion, and the material at this discharge port can be subjected to particle size screening according to subsequent different processes, or can be directly shaped by air flow). The fine particles are classified again by the tertiary classification wheel, and the coarse particles fall to the discharge port (the secondary discharge port, the material discharged from this discharge port does not require particle size classification operations such as screening and can be directly shaped by air flow). The fine particles are then collected by a dust removal box, and the collected material falls to the discharge port (the tertiary discharge port, the material discharged from this discharge port does not require particle size classification operations such as screening and can be directly shaped by a ball mill). Generally speaking, the frequencies f of the 3 classification wheels have the following rule: f1 < f2 < f3. The higher the frequency, the faster the motor speed. The faster the motor speed, the faster the rotation speed of the classification wheel driven. The faster the rotation speed of the classification wheel, the finer the particle size of the material classified by the classification wheel. In this way, the size of the crushing particle size and particle size classification can be controlled by the rotation speed of the classification wheel. The discharge particle sizes D of the three discharge ports are D1 > D2 > D3. f1 mainly controls the crushing particle size, and f2 and f3 mainly control the particle sizes of the corresponding discharge ports, that is, f2 controls the particle size of the primary discharge port, and f3 controls the particle size of the secondary discharge port. f2 is generally controlled between 25-40 Hz, f3 is generally controlled between 45-55 Hz, and f1 is mainly adjusted according to the size of the crushing particle size.

[0041] The crushing is carried out in 3 times, and the crushing parameters and shaping parameters are different each time. The specific process flow is as follows: <​​​​​​After the crushing air pressure is adjusted, the particle size of the primary discharge port is analyzed through a microscope or particle size detection. The speed of the first-level grading wheel is adjusted according to the particle size, and f1 is controlled at 8-10Hz, f2 is controlled at 30Hz, and f3 is controlled at 50Hz. The main particle size of the material at the primary discharge port is controlled at about 270 mesh. After the crushing is completed, the material at the primary discharge port is screened for particle size, and the particle size classification is carried out according to 270 mesh as coarse, 270 / 325 mesh, 325 / 500 mesh, and 500 mesh as fine. Among them, 270 mesh as coarse is used as the raw material for secondary crushing, and 270 / 325 mesh, 325 / 500 mesh, and 500 mesh as fine are shaped respectively. The shaping conditions are 0.6MPa, 50min; 0.55MPa, 1h; 0.55MPa, 1.5h. The shaped 325 / 500 mesh and 500 mesh fine materials are sent to the purification and purification process. This material has already completed the crushing and shaping process. The secondary discharge port is shaped according to the process of 0.55MPa and 1.5h. The shaped 270 / 325 mesh is screened and graded into 270 / 325 mesh, 325 / 500 mesh, and 500 mesh fine. The shaped 325 / 500 mesh and 500 mesh fine materials and the secondary discharge port are sent to the purification and purification process. This material has already completed the crushing and shaping process. The 270 / 325 mesh and 270 mesh coarse materials are used as raw materials for the second crushing.

[0045] 2. Secondary crushing

[0046] First, adjust the crushing pressure. After one crushing, the hardness of the material is higher than that of the original material. The crushing pressure is adjusted according to the crystal form of the material at the discharge port observed under a microscope. Generally, it is close to the first crushing pressure, or adjusted by 0.05MPa. Generally, the crushing pressure is adjusted between 0.4-0.6MPa.

[0047] After the crushing air pressure is adjusted, the particle size at the primary discharge port is analyzed through a microscope or particle size detection. The speed of the first-stage classifying wheel is adjusted according to the particle size, and f1 is controlled at 9-13Hz, which is 1-3Hz higher than the first crushing. f2 is controlled at 35Hz and f3 is controlled at 50Hz. The reason for adjusting f2 is that after the secondary crushing, relatively large crystals will appear in the second discharge port, which is the same as the material at the primary discharge port. Therefore, the speed of the secondary classifying wheel is increased, that is, the frequency is increased, and the material with the same crystal form is discharged from the primary discharge port.

[0048] The material from the primary discharge is screened into 270 / 325 mesh, 325 / 500 mesh, and 500 mesh (fine). The 270 / 325 mesh is used as the raw material for the third crushing. The 325 / 500 mesh and 500 mesh (fine) are then subjected to airflow shaping, with the shaping processes being 0.6 MPa for 30 minutes and 0.6 MPa for 50 minutes, respectively. The material from the secondary discharge of the second crushing process is shaped at 0.55 MPa for 40 minutes. After shaping, the 325 / 500 mesh, 500 mesh (fine), and secondary discharge material are fed into the purification and purification process. This material has already completed the crushing and shaping process, and the 270 / 325 mesh is used as the raw material for the third crushing process.

[0049] 3. Three-time crushing

[0050] First, adjust the crushing pressure. After the second crushing, the hardness of the material is higher than that of the original material. The crushing pressure is adjusted according to the crystal form of the material at the first discharge port observed under a microscope. Generally, it is close to the first crushing pressure, or adjusted by 0.05MPa. Generally, the crushing pressure is adjusted between 0.4-0.6MPa.

[0051] After the crushing air pressure is adjusted, the particle size at the first discharge port is analyzed through a microscope or particle size detection. The speed of the first-stage grading wheel is adjusted according to the particle size. The f1 is controlled at 14-18Hz, which is 1-5Hz higher than the second crushing. The f2 is controlled at 35Hz and the f3 is controlled at 50Hz.

[0052] The third crushing process directly crushes the material to 325 mesh or finer. No particle size screening is required for the third crushing process. After crushing, the materials at the primary and secondary discharge ports are directly shaped. The shaping process is 0.55MPa, 20min; 0.55MPa, 30min. The shaped materials are sent to the purification process, and the crushing process is completed.

[0053] The materials from the three discharge ports produced by the three crushing processes are combined together and put into a ball mill for shaping. The shaping process time is 72 hours, and the ball-to-material ratio is 1:5.

[0054] The final product output ratio is as follows Figure 2 As shown in the figure, the discharge ratio of 20-40 microns is the highest, accounting for about 32.59%, or about 1 / 3, achieving the established process goals.

[0055] Crystal form Figure 3 As shown, the crystal form is uniform block particles, which meets the requirements.

[0056] Comparative Example 1

[0057] The target particle size is 20-40 microns. During the secondary crushing, the frequency of the secondary classifying wheel is not adjusted and is maintained at 30 Hz. The remaining steps are consistent with Example 1. The remaining steps are consistent with Example 1. Finally, the discharge ratio of particles between 20-40 microns is 18%.

[0058] Comparative Example 2

[0059] The target particle size was 20-40 μm. During the secondary and tertiary crushing, the frequency of the primary classifying wheel was not adjusted and was maintained at 30 Hz. The remaining steps were the same as those in Example 1. Finally, the discharge ratio of particles between 20 and 40 μm was 22%.

[0060] By comparison, during secondary and tertiary crushing, if the frequency of the primary and secondary classifying wheels is not adjusted, the discharge ratio of the required particle size product will be significantly reduced.

[0061] Comparative Example 3

[0062] The target particle size is 20-40 microns. During the first crushing, the particle size of the first-level discharge port is directly controlled at 500 mesh. After the materials at each level of discharge port are ball-milled and shaped, they enter the purification process. The discharge ratio of 20-40 microns is 15%.

[0063] From the comparison, it can be seen that when directly crushing to the target particle size, the discharge ratio is much lower than that of the solution in Example 1.

Claims

1. A process for crushing artificial diamond micropowder with high particle size distribution, characterized in that: The following steps are involved: 1) The raw diamonds are crushed once in the air flow crusher. The air flow crusher is provided with a primary discharge port, a secondary discharge port and a tertiary discharge port in sequence according to the air flow direction. Each discharge port is provided with a primary classifying wheel, a secondary classifying wheel and a tertiary classifying wheel. The discharge particle size of each discharge port is controlled by the frequency of each classifying wheel. The discharge particle size of the primary discharge port is controlled at D1, the discharge particle size of the secondary discharge port is controlled at D2, and the discharge particle size of the tertiary discharge port is controlled at D3. D1>D2>D3; 2) The material at the primary discharge port is screened and graded to obtain coarse material, medium material, medium-fine material and fine material. The coarse material is used as the raw material for secondary crushing, and the remaining material is separately air-shaped. The medium-fine material and fine material after shaping are purified and become products; The material at the secondary discharge port undergoes airflow shaping and becomes a product after purification; 3) The shaped medium material is screened and graded again to obtain medium material, medium-fine material and fine material. The medium material is used as the raw material for secondary crushing, and the medium-fine material and fine material are purified and become products; 4) The coarse material from step 2) and the medium material from step 3) are subjected to secondary crushing. The material at the primary discharge port is screened and graded to obtain medium material, medium-fine material, and fine material. The medium material serves as the raw material for the tertiary crushing. The medium-fine material, fine material, and material at the secondary discharge port are subjected to airflow shaping and purification to become the product. 5) The intermediate material from step 4) is crushed three times, and the materials from the primary and secondary discharge ports are shaped by airflow and purified to become products; In steps 2) to 4), the particle size of the coarse material is greater than D1, the particle size of the medium material is [D1, D2), the particle size of the medium-fine material is [D2, D3), and the particle size of the fine material is ≤ D3; In steps 1) to 5), the air pressure during the primary crushing is controlled at 0.4-0.6 MPa; the frequency of the first-stage classifying wheel is controlled at 8-10 Hz, the frequency of the second-stage classifying wheel is controlled at 30 Hz, and the frequency of the third-stage classifying wheel is controlled at 50 Hz; The air pressure during secondary crushing is controlled at 0.4-0.6MPa; the frequency of the first-stage classifying wheel is controlled at 9-13Hz, the frequency of the second-stage classifying wheel is controlled at 35Hz, and the frequency of the third-stage classifying wheel is controlled at 50Hz; The air pressure during the three crushing processes is controlled at 0.4-0.6 MPa; the frequency of the first-stage classifying wheel is controlled at 14-18 Hz, the frequency of the second-stage classifying wheel is controlled at 35 Hz, and the frequency of the third-stage classifying wheel is controlled at 50 Hz.

2. The process for crushing artificial diamond micropowder with high particle size distribution according to claim 1, characterized in that: In steps 1), 4), and 5), the materials from the three discharge ports are all ball-milled and shaped, and then purified to become products.

3. The process for crushing artificial diamond micropowder with high particle size distribution according to claim 1, characterized in that: When the target particle size is D0, D1 is controlled to be 1.8-2.1 times of D0, and D3 is controlled to be consistent with D0.

4. The process for crushing artificial diamond micropowder with high particle size distribution according to claim 2, characterized in that: The target particle size is 20-40 microns, and the control D1 is 270 mesh, D2 is 325 mesh, and D3 is 500 mesh.

5. The process for crushing artificial diamond micropowder with high particle size distribution according to claim 1, characterized in that: In step 2), the air pressure for shaping the medium material airflow is 0.6 MPa, and the time is 50 minutes; the air pressure for shaping the medium and fine material airflow is 0.55 MPa, and the time is 1 hour; the air pressure for shaping the fine material airflow is 0.55 MPa, and the time is 1.5 hours; the air pressure for shaping the material airflow at the secondary discharge port is 0.55 MPa, and the time is 1.5 hours; In step 4), the air pressure for shaping the medium and fine materials is 0.6 MPa, and the time is 30 minutes; the air pressure for shaping the fine materials is 0.6 MPa, and the time is 50 minutes; the air pressure for shaping the material air flow at the secondary discharge port is 0.55 MPa, and the time is 1.5 hours; In step 5), the air pressure of the material airflow shaping at the primary discharge port is 0.55 MPa, and the time is 20 minutes; the air pressure of the material airflow shaping at the secondary discharge port is 0.55 MPa, and the time is 30 minutes.

6. The process for crushing artificial diamond micropowder with high particle size distribution according to claim 2, characterized in that: In steps 1), 4), and 5), the ball-to-material ratio of ball milling is 1:5, and the time is 72 hours.

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