Method for crushing sintered blocks of oxide ceramic spherical particles

Abstract

The present application relates to the field of ceramic powder crushing, and discloses a kind of oxide ceramic spherical particle sintered block crushing method, comprising the following steps: step 1: oxide powder is put into vertical stirring ball mill with pure water and is ball milled, after slurry average particle size reaches requirement, binder is added and stirred;Step 2: slurry after stirring is carried out spray granulation;Step 3: spherical particles obtained in step 2 are placed into defatting sintering furnace, and sintered block is formed;Step 4: sintered block obtained in step 3 is transported to crushing device for crushing, and spherical particles are obtained;The crushing device in step 3 includes a plurality of crushing rollers, rack, first driving module for driving the rotation of crushing roller;The crushing roller is provided with a plurality of tooth grooves;The plurality of crushing rollers rotate towards each other and at the feed inlet, the tooth grooves of the plurality of crushing rollers gradually move away;The rotation speed of the crushing roller is 50-60rpm.The present application can crush sintered block into single spherical particle without breaking spherical particle.

Description

Technical Field

[0001] This invention relates to the field of ceramic powder crushing, and more particularly to a method for crushing sintered blocks of oxide ceramic spherical particles. Background Technology

[0002] Spray dryers are commonly used in powder metallurgy, chemical, and food industries. They rapidly dry wet-process materials to obtain powders with very low moisture content. With continuous improvements, spray dryers can not only dry materials quickly but also produce particles with very high sphericity. However, these spherical particles are simply powder aggregates, with a particle size <100μm and no strength, easily dispersing into powder. Therefore, high-temperature sintering is required to grow the powder grains into complete spherical particles, increasing strength. However, after high-temperature sintering, the spherical particles agglomerate into a sintered block, which then needs to be crushed and ground to obtain the desired spherical particles. Current crushing methods generally involve collision crushing, compression crushing, and shear crushing. These methods produce irregularly shaped particles, requiring secondary grinding to obtain the desired spherical particles. Furthermore, the grinding process generates a lot of fine powder that needs to be collected and processed, resulting in numerous steps and slow efficiency.

[0003] CN202211519528 discloses a method for preparing coarse boron carbide powder with high sphericity and a crushing device, which includes the following steps: S11, boron carbide blocks are put into the main body of the crushing device, and the primary crushing motor is started to drive the crushing disc to rotate. The support rod on the crushing disc rotates inside the main body of the crushing device. Since the slopes of the second and first sections of the crushing disc are different, the boron carbide first comes into contact with the inner wall of the main body of the crushing device for compression and crushing. The boron carbide at the top will move downward and the boron carbide will also be squeezed against each other, which can achieve rapid crushing; S12, the crushed boron carbide moves along the guide plate to the diversion plate. As the amount of boron carbide increases, the diversion spring is stretched, causing the diversion plate to rotate and fall to the grinding ball. The boron carbide is ground by the relative rotation of the grinding ball.

[0004] The crushing method used in the comparative document involves the crushing disc, the inner wall, and the boron carbide being squeezed together to break the boron carbide into irregular small particles. These particles are then further ground by grinding balls to obtain spherical particles. Subsequent air jet milling and autogenous milling are also required. Furthermore, a lot of fine powder is generated during the crushing process, which requires additional equipment for collection and processing. The process involves many steps and is relatively slow.

[0005] The technical problem to be solved by this invention is: how to obtain individual oxide ceramic spherical particles from sintered blocks of oxide ceramic particles through a single crushing process. Summary of the Invention

[0006] The main objective of this invention is to provide a method for crushing sintered blocks of oxide ceramic spherical particles. In the crushing device, the left crushing roller rotates counterclockwise and the right crushing roller rotates clockwise, thereby crushing the sintered block towards the top without compressing it. Combined with the crushing roller rotation speed of 50-60 rpm, the sintered blocks of oxide ceramic spherical particles are crushed into individual oxide ceramic spherical particles in one operation.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0008] A method for crushing sintered blocks of oxide ceramic spherical particles includes the following steps:

[0009] Step 1: Place the zirconia balls in a vertical stirred ball mill, then add the oxide powder and pure water into the vertical stirred ball mill, add a dispersant or surfactant and ball mill. After the average particle size of the slurry reaches the required level, add a binder and stir.

[0010] Step 2: After mixing, the slurry is transported to a centrifugal spray dryer by a peristaltic pump for spray granulation;

[0011] Step 3: Load the spherical particles obtained in Step 2 into a corundum saggar and place them into a degreasing sintering furnace. Heat the furnace to a temperature above 1200℃ and hold for 7-9 hours to form sintered blocks.

[0012] Step 4: The sintered block obtained in Step 3 is fed to a crushing device for crushing to obtain spherical particles;

[0013] The crushing device in step 3 includes multiple crushing rollers, a frame, and a first drive module for driving the crushing rollers to rotate. A housing is mounted on the frame; the housing has a feed inlet; each crushing roller has a drive shaft; the drive shaft is fixed inside the housing and hinged to it; the power output end of the first drive module is fixedly connected to the end of the drive shaft; each crushing roller has multiple toothed grooves; the toothed grooves and the edge of the crushing roller form a first angle and a second angle; the first angle is 80°–100°; the second angle is obtuse; along the rotation direction of the crushing roller, the second angle is located in front of the first angle; the multiple crushing rollers rotate towards each other, and at the feed inlet, the toothed grooves of the multiple crushing rollers gradually move away from each other; the rotation speed of the crushing rollers is 50–60 rpm.

[0014] Preferably, the crushing device further includes a gap adjustment module for adjusting the gap between multiple crushing rollers; the gap adjustment module is fixed on the frame and fixedly connected to the end of the drive shaft; the gap between the crushing rollers is 0.2 to 0.6 mm.

[0015] Preferably, step 4 specifically comprises:

[0016] Step A: Adjust the gap between the crushing rollers using the gap adjustment module;

[0017] Step B: Adjust the rotational speed of the first drive module, thereby adjusting the rotational speed of the crushing roller;

[0018] Step C: The sintered block obtained in step 3 is fed from the feed inlet to the crushing device for crushing to obtain spherical particles.

[0019] Preferably, the top of the box is provided with a cover plate; the gap between the crushing roller and the cover plate is 0.2 to 0.6 mm.

[0020] Preferably, the crushing roller is a zirconia ceramic roller, a Cr12 tool steel roller, or a tungsten carbide roller; the length of the crushing roller is 300mm to 500mm; and the diameter of the crushing roller is 150mm to 350mm.

[0021] Preferably, the upper surface of the housing is provided with a feeding hopper; the feeding hopper is connected to the feed inlet; the feeding hopper is located between multiple crushing rollers; the lower surface of the housing is provided with a discharge bin; the discharge bin is located directly below the feeding hopper.

[0022] Preferably, the average particle size of the slurry is required to be less than 2 μm.

[0023] Preferably, the dispersant is an aqueous solution of ammonium polycarboxylate; the surfactant is an aqueous solution of triethylhexylphosphoric acid; and the concentrations of both the aqueous solution of ammonium polycarboxylate and the aqueous solution of triethylhexylphosphoric acid are 20% to 30%.

[0024] Preferably, the steps further include step 5: the powder obtained after crushing in step 4 is sieved using a sieve and the sieved powder is collected.

[0025] Compared with existing technologies, this solution has the following advantages:

[0026] 1. The crushing method for oxide ceramic spherical particle sintered blocks in this case involves specifying the rotation direction of the crushing device, causing the left crushing roller to rotate counterclockwise and the right crushing roller to rotate clockwise. The first corner of the tooth groove performs friction crushing on the spherical particle sintered blocks. Due to the rotation direction of the crushing roller, the particles are driven towards the top of the box by the crushing roller, thereby avoiding the particles being squeezed by the crushing roller and destroying the spherical shape of the particles. Moreover, micron-level crushing can be achieved in one process, reducing the number of processes and improving efficiency.

[0027] 2. In the crushing method for sintered oxide ceramic spherical particles in this case, the crushing roller of the crushing device rotates at a speed of 50–60 rpm. When the rotation speed is less than 50 rpm, the kinetic energy of the crushing roller is low, and the crushing roller is prone to jamming and stopping during the crushing process, and several particles will be produced sticking together. When the rotation speed is greater than 60 rpm, the crushing roller is easily worn, reducing its service life, and the material is easily splashed out of the housing. Therefore, a rotation speed of 50–60 rpm can ensure stable crushing of the crushing device and improve efficiency.

[0028] 3. The crushing method for sintered oxide ceramic spherical particles in this case solves the defect that the agglomerates obtained by spray granulation of oxide ceramic powder cannot be crushed into perfect spheres after sintering. Compared with crushing methods such as impact crushing, extrusion crushing, and shear crushing, the crushing method in this case is relatively mild, introduces low impurity content, and does not produce fine powder <1μm. The crushing method in this case is low in cost, low in power consumption, and can be operated continuously, making it suitable for industrial production. Attached Figure Description

[0029] Figure 1 This is a flowchart illustrating the steps of the crushing method for the sintered oxide ceramic spherical particles in Example 1.

[0030] Figure 2 This is a cross-sectional view of the crushing device;

[0031] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0032] Figure 4 La obtained by spray granulation in Example 1 0.8 Sr 0.2 Scanning electron microscope image of MnO3;

[0033] Figure 5 La after crushing in Example 1 0.8 Sr 0.2 Scanning electron microscope image of MnO3;

[0034] Figure 6 La after crushing in Example 1 0.8 Sr 0.2 Particle size distribution diagram of MnO3;

[0035] Figure 7 La obtained by spray granulation in Example 2 0.8 Sr 0.2 Scanning electron microscope image of MnO3;

[0036] Figure 8 La after crushing in Example 2 0.8 Sr0.2 Scanning electron microscope image of MnO3;

[0037] Figure 9 La after crushing in Example 2 0.8 Sr 0.2 Particle size distribution diagram of MnO3;

[0038] Figure 10 The image shows a scanning electron microscope (SEM) image of the bonded spherical particles in Comparative Example 1.

[0039] Figure 11 The image shows a scanning electron microscope (SEM) image of the broken spherical particles from Comparative Example 2. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application implemented as described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] The crushing method for sintered oxide ceramic spherical particles described in this invention is based on a crushing device, the principle of which is described in detail below:

[0042] refer to Figure 2-3 The crushing device includes multiple crushing rollers 1, a frame 2, and a first drive module 3 for driving the crushing rollers 1 to rotate. A housing 21 is mounted on the frame 2. The housing 21 has a feed inlet 22. Each crushing roller 1 has a drive shaft 11. The drive shaft 11 is fixed inside the housing 21 and hinged to it. The power output end of the first drive module 3 is fixedly connected to the end of the drive shaft 11. Each crushing roller 1 has multiple toothed grooves 12. The toothed grooves 12 and the edge of the crushing roller 1 form a first angle 13 and a second angle 14. The first angle 13 is 90°. The second angle 14 is 140°. Along the rotation direction of the crushing roller 1, the second angle 14 is located in front of the first angle 13. The multiple crushing rollers 1 rotate towards each other, and at the feed inlet 22, the toothed grooves 12 of the multiple crushing rollers 1 gradually move away from each other. The rotation speed of the crushing roller 1 is 50–60 rpm.

[0043] The specific working principle of this crushing device is as follows: First, the rotation direction of the crushing roller 1 is limited. Viewed from the front of the crushing device, the left crushing roller 1 rotates counterclockwise, and the right crushing roller 1 rotates clockwise. This causes the oxide ceramic spherical particle sintered blocks to roll towards the feed inlet 22 under the push of the crushing roller 1, thus avoiding the oxide ceramic spherical particle sintered blocks being squeezed between the crushing rollers 1. The crushing of the oxide ceramic spherical particle sintered blocks mainly relies on the friction between the toothed groove 12 and the oxide ceramic spherical particle sintered blocks, thereby causing individual oxide ceramic spherical particles to peel off from the oxide ceramic spherical particle sintered blocks, thus achieving the goal of obtaining a single complete oxide ceramic spherical particle in one crushing operation.

[0044] Secondly, the rotation speed of the crushing roller 1 needs to be within the range of 50 to 60 rpm to ensure stable operation of the crushing device. When the rotation speed is less than 50 rpm, the kinetic energy of the crushing roller 1 is low, and the crushing roller 1 is prone to jamming and stopping during the crushing process. Moreover, the crushing effect is poor, and there is a problem of several spherical particles sticking together. When the rotation speed is greater than 60 rpm, the crushing roller 1 is prone to wear, reducing the service life of the crushing roller 1, and the material is prone to splashing out of the box 21.

[0045] It should be noted that crushing methods such as impact crushing, compression crushing, and shear crushing will damage the shape of the spherical particles in the sintered block, causing them to become irregularly shaped. This requires secondary grinding to reshape the irregularly shaped particles into spherical ones. During the grinding process, a large amount of fine powder is also generated, which needs to be collected and processed. This increases the number of steps and costs, and reduces processing efficiency.

[0046] The rotation direction of the crushing roller 1 in this crushing device is precisely to solve this problem. The crushing roller 1 will push the sintered block of oxide ceramic spherical particles upward instead of squeezing downward, thereby making the force of the tooth groove 12 on the sintered block of oxide ceramic spherical particles relatively smaller, so that the spherical shape can be maintained when obtaining individual oxide ceramic spherical particles.

[0047] Preferably, the crushing device further includes a gap adjustment module 4 for adjusting the gap between the multiple crushing rollers 1; the gap adjustment module 4 is fixed on the frame 2 and fixedly connected to the end of the drive shaft 11; the gap between the crushing rollers 1 is 0.2 to 0.6 mm.

[0048] The gap between the crushing rollers 1 is preferably 0.3mm. The gap between the crushing rollers 1 is adjusted by the gap adjustment module 4 to prevent the gap from being too large, so that the sintered block of oxide ceramic spherical particles will leave the crushing device without being crushed.

[0049] Preferably, the top of the box 21 is provided with a cover plate 23; the gap between the crushing roller 1 and the cover plate 23 is 0.2 to 0.6 mm.

[0050] The cover plate 23 and the box body 21 work together to cover the crushing roller 1, preventing the sintered spherical oxide ceramic particles from spilling out from the top of the box body 21. When the cover plate 23 does not touch the crushing roller 1, the gap between the cover plate 23 and the crushing roller 1 is preferably 0.3 mm, preventing the sintered spherical oxide ceramic particles from falling from the top of the box body 21 through the side of the box body 21 to the bottom of the box body 21, thus ensuring that all the sintered spherical oxide ceramic particles are crushed.

[0051] Preferably, the crushing roller 1 is a zirconia ceramic roller, a Cr12 tool steel roller, or a tungsten carbide roller; the length of the crushing roller 1 is 300mm to 500mm; and the diameter of the crushing roller 1 is 150mm to 350mm.

[0052] Since the crushing roller 1 needs to be crushed by friction with the sintered block of oxide ceramic spherical particles, it needs to be made of a wear-resistant and high-hardness material. The length of the crushing roller 1 is preferably 400 mm and the diameter of the crushing roller 1 is preferably 300 mm.

[0053] Preferably, the upper surface of the housing 21 is provided with a feed hopper 24; the feed hopper 24 is connected to the feed inlet 22; the feed hopper 24 is located between multiple crushing rollers 1; the lower surface of the housing 21 is provided with a discharge bin 25; the discharge bin 25 is located directly below the feed hopper 24.

[0054] The oxide ceramic spherical granules sintered blocks enter the crushing device from the feed hopper 24, are crushed by the crushing roller 1, and are discharged from the discharge bin 25 at the bottom of the box 21, and collected using an external stainless steel bucket.

[0055] Preferably, the dispersant is an aqueous solution of ammonium polycarboxylate; the surfactant is an aqueous solution of triethylhexylphosphoric acid; and the concentrations of both the aqueous solution of ammonium polycarboxylate and the aqueous solution of triethylhexylphosphoric acid are 20% to 30%. Preferably, the concentrations of both the aqueous solution of ammonium polycarboxylate and the aqueous solution of triethylhexylphosphoric acid are 30%.

[0056] Example 1

[0057] The following section provides a further description of a method for crushing sintered blocks of oxide ceramic spherical particles, with specific working procedures as an example.

[0058] A method for crushing sintered blocks of spherical oxide ceramic particles, specifically La... 0.8 Sr 0.2 MnO3, including the following steps:

[0059] refer to Figure 4-6 Step 1: Place the zirconia balls in a vertical stirred ball mill, then add La... 0.8 Sr 0.2 MnO3 powder and pure water are added to a vertical stirred ball mill. During the ball milling process, an aqueous solution of polycarboxylic acid ammonium is added to prevent La from being affected. 0.8 Sr 0.2 MnO3 powder agglomerates. When the average particle size of the slurry is less than 2 μm, a binder is added and the mixture is stirred.

[0060] Step 2: After mixing, the slurry is pumped to a centrifugal spray dryer for spray granulation to obtain La. 0.8 Sr 0.2 MnO3 spherical particles, obtained La 0.8 Sr 0.2 Spherical MnO3 particles, as shown in scanning electron microscopy. Figure 4 As shown;

[0061] Step 3: The spherical particles obtained in Step 2 are loaded into a corundum saggar and placed into a degreasing sintering furnace. The temperature is 1250℃ for high-temperature sintering and held for 8 hours. The primary grains of the individual spherical particles continue to grow and become denser through sintering. The spherical particles shrink continuously to form a tight sintered block.

[0062] Step 4: The sintered block obtained in Step 3 is fed to a crushing device for crushing to obtain spherical particles;

[0063] Step 4 specifically involves:

[0064] Step A: Adjust the gap between the crushing rollers 1 using the gap adjustment module 4; the adjusted gap between the crushing rollers 1 is 0.3mm;

[0065] Step B: Adjust the rotation speed of the first drive module 3 by using a frequency converter, thereby adjusting the rotation speed of the crushing roller 1 to 51 rpm;

[0066] Step C: The sintered block obtained in step 3 is conveyed from the feed port 22 to the crushing device for crushing. The sintered block is crushed by friction and non-extrusion through the tooth groove 12 to obtain individual spherical particles.

[0067] Step 5: The powder obtained after crushing in Step 4 is collected in a stainless steel bucket and then sieved through a 325-mesh sieve. The collected undersize powder is examined using a scanning electron microscope and found to be single spherical particles, such as... Figure 5 As shown, the particle size is concentrated in the range of 6-50 μm, such as Figure 6 As shown.

[0068] Example 2

[0069] The following section further describes a method for crushing sintered blocks of oxide ceramic spherical particles, using another specific working method as an example. Details are provided below:

[0070] refer to Figure 7-9 A method for crushing sintered blocks of spherical oxide ceramic particles, specifically La... 0.8 Sr 0.2 MnO3, including the following steps:

[0071] Step 1: Place the zirconia balls in a vertical stirred ball mill, then add La... 0.8 Sr 0.2 MnO3 powder and pure water were added to a vertical stirred ball mill. During the milling process, triethylhexylphosphoric acid aqueous solution was added to prevent the formation of La. 0.8 Sr 0.2 MnO3 powder agglomerates. When the average particle size of the slurry is less than 2 μm, a binder is added and the mixture is stirred.

[0072] Step 2: After mixing, the slurry is pumped to a centrifugal spray dryer for spray granulation to obtain La. 0.8 Sr 0.2 MnO3 spherical particles, obtained La 0.8 Sr 0.2 Spherical MnO3 particles, as shown in scanning electron microscopy. Figure 7 As shown;

[0073] Step 3: The spherical particles obtained in Step 2 are loaded into a corundum saggar and placed into a degreasing sintering furnace. The temperature is 1300℃ for high-temperature sintering and held for 8 hours. The primary grains of the individual spherical particles continue to grow and become denser through sintering. The spherical particles shrink continuously to form a tight sintered block.

[0074] Step 4: The sintered block obtained in Step 3 is fed to a crushing device for crushing to obtain spherical particles;

[0075] Step 4 specifically involves:

[0076] Step A: Adjust the gap between the crushing rollers 1 using the gap adjustment module 4; the adjusted gap between the crushing rollers 1 is 0.3mm;

[0077] Step B: Adjust the rotation speed of the first drive module 3 by using a frequency converter, thereby adjusting the rotation speed of the crushing roller 1 to 60 rpm;

[0078] Step C: The sintered block obtained in step 3 is conveyed from the feed port 22 to the crushing device for crushing. The sintered block is crushed by friction and non-extrusion through the tooth groove 12 to obtain individual spherical particles.

[0079] Step 5: The powder obtained after crushing in Step 4 is collected in a stainless steel bucket and then sieved through a 400-mesh sieve. The collected undersize powder is examined using a scanning electron microscope and found to be single spherical particles, such as... Figure 8 As shown, the particle size is concentrated in the range of 6-50 μm, such as Figure 9 As shown.

[0080] Comparative Example 1

[0081] This comparative example is basically the same as Example 1, except that the rotation speed of the crushing roller 1 is 40 rpm.

[0082] When the rotation speed is 40 rpm, the crushed La 0.8 Sr 0.2 MnO3 particles can exhibit adhesion problems, such as... Figure 10 As shown.

[0083] Comparative Example 2

[0084] This comparative example is basically the same as Example 1, except that the multiple crushing rollers 1 rotate in opposite directions and the tooth grooves 12 of the multiple crushing rollers 1 gradually approach each other at the feed inlet 22.

[0085] Viewed from the front, the left crushing roller 1 rotates clockwise, and the right crushing roller 1 rotates counterclockwise; in other words, the rotation direction of the crushing rollers is opposite to that of the crushing roller 1 in Embodiment 1. The resulting particles are irregularly shaped, and the spherical shape is destroyed, thus obtaining the spherical particles required by this invention, such as... Figure 11 As shown.

[0086] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method of crushing sintered blocks of oxide ceramic spherical particles, characterized in that, It comprises the following steps: Step 1: Put the zirconia balls into a vertical stirring ball mill, and then put the oxide powder and pure water into the vertical stirring ball mill, add a dispersant or a surfactant for ball milling, and then add a binder after the slurry reaches the required average particle size and stir; Step 2: After the slurry is stirred, it is transported to a centrifugal spray dryer for spray granulation by a peristaltic pump; Step 3: The spherical particles obtained in step 2 are loaded into a corundum box and placed in a debinding sintering furnace, the heating temperature is above 1200℃, and the holding time is 7-9 hours to form a sintered block; Step 4: The sintered block obtained in step 3 is transported to a crushing device for crushing to obtain spherical particles; The step 4 is specifically: Step A: Adjust the gap between the crushing rollers through the gap adjusting module; Step B: Adjust the rotation speed of the first driving module to adjust the rotation speed of the crushing rollers; Step C: The sintered block obtained in step 3 is transported from the feeding port to the crushing device for crushing to obtain spherical particles; The crushing device in step 3 comprises a plurality of crushing rollers, a rack, a first driving module for driving the crushing rollers to rotate; the rack is provided with a box; the box is provided with a feeding port; the crushing roller is provided with a transmission shaft; the transmission shaft is fixed in the box and is hinged to the box; the power output end of the first driving module is fixedly connected with the end of the transmission shaft; the crushing roller is provided with a plurality of tooth grooves; the tooth grooves and the edges of the crushing roller form a first angle and a second angle; the angle of the first angle is 80°-100°; the second angle is an obtuse angle; along the rotation direction of the crushing roller, the second angle is located in front of the first angle; the plurality of crushing rollers rotate towards each other and the tooth grooves of the plurality of crushing rollers gradually move away at the feeding port; the rotation speed of the crushing roller is 50-60rpm.

2. The method of claim 1, wherein the oxide ceramic spherical particle sintered block is broken into pieces having a diameter of 0.5 to 2 mm. The crushing device further comprises a gap adjusting module for adjusting the gap between the plurality of crushing rollers; the gap adjusting module is fixed on the rack and is fixedly connected with the end of the transmission shaft; the gap between the crushing rollers is 0.2-0.6mm.

3. The method of claim 1, wherein the oxide ceramic spherical particle sintered block is crushed by a hammer mill. The top of the box is provided with a cover plate; the gap between the crushing roller and the cover plate is 0.2-0.6mm.

4. The method of claim 1, wherein the oxide ceramic spherical particle sintered block is broken into pieces having a diameter of 0.5 to 2 mm. The crushing roller is made of zirconia ceramic roller, Cr12 tool steel or tungsten carbide; the length of the crushing roller is 300-500mm; the diameter of the crushing roller is 150-350mm.

5. The method of claim 1, wherein the oxide ceramic spherical particle sintered block is broken into pieces having a diameter of 0.5 to 2 mm. The upper surface of the box is provided with a feeding hopper; the feeding hopper is communicated with the feeding port; the feeding hopper is located between the plurality of crushing rollers; the lower surface of the box is provided with a discharging bin; the discharging bin is located directly below the feeding hopper.

6. The method of claim 1, wherein the oxide ceramic spherical particle sintered block is broken into pieces having a diameter of 0.5 to 2 mm. The average particle size of the slurry is less than 2μm.

7. The method of claim 1, wherein the oxide ceramic spherical particle sintered block is broken into pieces having a diameter of 0.5 to 2 mm. The dispersant is a polybasic ammonium carboxylate aqueous solution; the surfactant is a triethylhexyl phosphoric acid aqueous solution; the concentration of the polybasic ammonium carboxylate aqueous solution and the triethylhexyl phosphoric acid aqueous solution is 20%-30%.

8. A method of crushing sintered blocks of oxide ceramic spherical particles according to any one of claims 1 to 7, characterized in that, The step further comprises step 5: the powder obtained after crushing in step 4 is sieved using a screening machine, and the sieved powder is collected.

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