Indium tin oxide powder production process and equipment

Abstract

The invention relates to an indium tin oxide powder production process and equipment, and relates to the technical field of oxide powder production.The indium tin oxide powder production process comprises the steps that S1, indium melting is conducted, specifically, an indium ingot is heated and melted, and liquid indium is obtained; s2, oxidation reaction, wherein liquid indium is put into a direct-current electric arc furnace, and atomized indium tin oxide is generated; s3, settling: introducing the atomized indium tin oxide into a settling device, and settling coarse indium tin oxide particles; s4, cyclone separation: introducing the indium tin oxide into a cyclone separator, and separating out coarse indium tin oxide particles; s5, cloth bag recovery: introducing the indium tin oxide into a cloth bag recovery device to obtain indium tin oxide particles; and S6, powder treatment: grinding the indium tin oxide particles by a grinding unit, and screening by a screening unit to obtain the required particle size and form. The device has the beneficial effects that the ground ITO particles flow back to the grinding unit to be ground, shutdown is not needed, continuous grinding operation is achieved, and the metal grinding efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oxide powder production, and in particular to a process and equipment for producing indium tin oxide powder. Background Art

[0002] Indium tin oxide (ITO) is an n-type semiconductor material with excellent optoelectronic properties. In the existing ITO powder production, soluble salts containing indium and tin elements are usually processed into ITO particles first, and then the ITO particles are ground into ITO powder. In the process of grinding the ITO particles into ITO powder, a grinding mechanism is usually used to grind the metal, and the ITO particles added once are ground into a particle size that meets the requirements in a single grinding process. However, after the grinding is completed, the machine needs to be stopped for discharging, and then the filling process is carried out, which takes a lot of time and reduces the production efficiency of ITO powder. Summary of the invention

[0003] In order to improve the problem that after grinding, the machine needs to be stopped for discharging and then for filling, which takes a long time and reduces the grinding efficiency, the present invention provides an indium tin oxide powder production process and equipment.

[0004] On the one hand, the present invention provides an indium tin oxide powder production process using the following technical solution: A process for producing indium tin oxide powder comprises the following steps: S1. Indium smelting: heating and melting the indium ingot to obtain liquid indium; S2, oxidation reaction: the liquid indium obtained in step S1 is put into a DC arc furnace to react with oxygen to generate atomized indium tin oxide; S3, sedimentation: passing the atomized indium tin oxide into a sedimentation device to sediment the coarse indium tin oxide particles; S4, cyclone separation: passing the indium tin oxide treated in step S3 into a cyclone separator to separate the coarse indium tin oxide particles; S5, bag recovery: passing the indium tin oxide treated in step S4 into a bag recovery device for cooling and recovery to obtain indium tin oxide particles; S6, powder processing: After the indium tin oxide particles are ground by the grinding unit (3), they are screened by the screening unit, and the ITO powder that meets the required particle size is dried and dehydrated by the drying and dehydration unit (6) and then collected. The ITO powder that does not meet the required particle size is returned to the grinding unit (3) through the circulation unit (8) and ground again to obtain the required particle size and morphology.

[0005] By adopting the above technical scheme, the indium ingot is subjected to the processes of indiumization, oxidation reaction, sedimentation, cyclone separation and bag recovery to generate ITO particles, which are then ground into a mixture of ITO particles and ITO powder in a grinding unit, and then enter the screening unit. The screening unit screens out the ITO powder that meets the predetermined particle size, and the ITO particles enter the circulation unit and flow back to the feed port of the grinding unit through the circulation unit to enter the grinding unit for re-grinding, so that the discharging and feeding of the grinding do not need to be stopped, and the continuous operation of the grinding is realized, thereby improving the production efficiency of the ITO powder.

[0006] Optionally, in step S2, the temperature of the oxidation reaction is controlled at 1300-1800° C. by adjusting the voltage and / or current.

[0007] Optionally, in step S3, the condenser is turned on to allow the atomized indium tin oxide to enter a water-cooled sedimentation device through the condenser, and the temperature of the condenser is 700-750°C.

[0008] On the other hand, the present invention provides an indium tin oxide powder production device adopts the following technical solution: A device for producing indium tin oxide powder uses the indium tin oxide powder production process, comprising a grinding frame and a grinding unit, a screening unit, a circulation unit, and a drying and dehydration unit arranged on the grinding frame, wherein the grinding unit is used to receive ITO particles and grind them into ITO particle powder, the grinding unit is provided with a discharge port and a feed port, the screening unit is arranged at the outlet of the grinding unit, and is used to separate the ITO particles from the ITO powder, the circulation unit is used to receive the ITO particles screened out by the screening unit, and transport the ITO particles to the feed port of the grinding unit, and the ITO powder screened out by the screening unit enters the drying and dehydration unit.

[0009] By adopting the above technical scheme, in the production of ITO powder, ITO particles enter the grinding unit for grinding to form a mixture of particles and powder, and then enter the screening unit. The screening unit will screen out the ITO powder that meets the predetermined particle size. The ITO particles enter the circulation unit and flow back to the feed port of the grinding unit through the circulation unit to enter the grinding unit for further grinding. Then, they enter the drying and dehydration unit for drying to form ITO powder, thereby completing the production of ITO powder. By flowing the ITO particles in the discharge of the grinding unit back into the grinding unit for further grinding, the discharge and feed of the ITO particles do not need to be stopped, thereby realizing continuous grinding operation, thereby improving the production efficiency of ITO powder.

[0010] Optionally, the grinding unit includes a grinding cylinder and a grinding roller, wherein the grinding cylinder is fixedly arranged on the grinding frame, the grinding roller is rotatably arranged on the grinding frame and is located in the grinding cylinder, the grinding roller is provided with a grinding surface, a grinding space is formed between the grinding surface and the inner wall of the grinding cylinder, the discharge port and the feed port are both arranged on the grinding cylinder, and the ITO particles are discharged from the discharge port after being ground in the grinding space, and the grinding frame is provided with a driving member for driving the grinding roller to rotate; A wedge-shaped space is formed between the grinding roller and the inner wall of the grinding cylinder. The wedge-shaped space is arranged upstream of the grinding space along the flow direction of the ITO particles. The large end of the wedge-shaped space is connected to the grinding space.

[0011] By adopting the above technical solution, when grinding ITO particles, the driving member drives the grinding roller to rotate, and the ITO particles enter the grinding space under the action of gravity, and then the grinding surface grinds the ITO particles in the grinding space. After the ITO particles are ground, they are discharged from the discharge port, so that the grinding and discharging do not need to be stopped, thereby improving the convenience of grinding feeding and discharging; the ITO particles first fall into the wedge-shaped space, and then enter the grinding space along the small mouth end of the wedge-shaped space for grinding, thereby improving the stability of the ITO particles entering the grinding space for grinding.

[0012] Optionally, the screening unit includes a sieve plate and a vibration unit. The sieve plate is slidably arranged on the grinding frame and is used to receive the material flowing out of the discharge port. The sieve plate is inclined to the horizontal plane so that the material can flow along the sieve plate. The vibration unit is used to drive the sieve plate to vibrate.

[0013] By adopting the above technical solution, the material flowing out of the discharge port enters the sieve plate, and the ITO powder that meets the predetermined particle size falls into the drying and dehydration unit. The sieve plate screens the ITO particles with large particle size and moves along the sieve plate. The vibration unit drives the sieve plate to vibrate, which can improve the screening efficiency of the sieve plate and effectively prevent the ITO particles from clogging the sieve plate.

[0014] Optionally, the vibration unit includes a cam and a telescopic spring, wherein the telescopic spring is arranged on the grinding frame and connected to the sieve plate and is used to push the sieve plate up; the cam is rotatably arranged on the grinding frame and is used to press down the sieve plate and can be detached from the sieve plate; the cam is connected to the drive shaft through a transmission member, and the drive shaft drives the cam to rotate through the transmission member.

[0015] By adopting the above technical solution, when the screen plate is driven to vibrate, the driving shaft drives the cam to rotate through the transmission member, the cam pushes the screen plate downward, and squeezes the telescopic spring to contract. When the cam rotates to disengage from the screen plate, the telescopic spring pushes the screen plate upward, and this process is repeated to achieve continuous vibration of the screen plate, thereby accelerating the screening of the material flowing out of the discharge port.

[0016] Optionally, the transmission member includes a first bevel gear, a second bevel gear and a gear shaft, the drive shaft passes through the grinding cylinder, the first bevel gear is coaxially fixed on the end of the drive shaft extending out of the grinding cylinder, the gear shaft is fixed on the rotating axis of the cam, and the second bevel gear is coaxially fixed on the gear shaft and meshes with the first bevel gear.

[0017] Optionally, the circulation unit includes a circulation box and a guide plate, the circulation box is provided with a plurality of partitions, the plurality of partitions divide the circulation box into a plurality of storage slots, the circulation box is rotatably arranged on the grinding frame, the sieve plate can guide the ITO particles to fall into the storage slots, the guide plate is arranged on the grinding frame, the guide plate and the circulation box are slidingly arranged to seal the opening of the storage slots, a drop port is provided on the guide plate, the storage slots can move the ITO particles along the guide plate to the drop port, the grinding frame is provided with a guide member, the guide member is used to receive the ITO particles dropped from the drop port and guide them to the feed port of the grinding cylinder; The guide member comprises a guide pipe arranged on the grinding frame, the guide pipe is arranged to be inclined with respect to the horizontal plane, the highest end of the guide pipe is located below the drop port, and the lowest end is located above the feed port.

[0018] By adopting the above technical solution, the ITO particles screened by the sieve plate enter the storage tank, and then the circulation box drives the storage tank to move toward the feed port. In this process, the guide plate blocks the opening of the storage tank, which can prevent the ITO particles from falling from the storage tank, so that the storage tank can stably transport the ITO particles to the feed port. When the storage tank moves to the feed port, the ITO particles in the storage tank fall from the feed port and enter the grinding cylinder through the feed port under the guidance of the guide member for secondary grinding. This process is repeated to achieve continuous grinding of the ITO particles and improve the grinding efficiency of the ITO particles. The ITO particles falling from the feed port enter the guide pipe, and then finally fall into the feed port under the guidance of the guide pipe, thereby guiding the flow of the ITO particles.

[0019] Optionally, the grinding frame is provided with a rotating motor, the output shaft of the rotating motor is coaxially fixed with a driving gear, the circulation box is provided with a driven rack arranged along its circumference, and the driving gear is meshed with the driven rack.

[0020] By adopting the above technical solution, when the ITO particles are reflowing, the rotating motor is turned on, the rotating motor drives the driving gear to rotate, and the driving gear drives the circulation box to rotate by meshing with the driven rack, thereby realizing the driving of the circulation box.

[0021] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The indium ingot is subjected to the processes of indiumization, oxidation reaction, sedimentation, cyclone separation and bag recovery to generate ITO particles, which are then ground into a mixture of ITO particles and ITO powder in the grinding unit, and then enter the screening unit. The screening unit screens out the ITO powder that meets the predetermined particle size. The ITO particles enter the circulation unit and flow back to the feed port of the grinding unit through the circulation unit to enter the grinding unit for re-grinding, so that the discharging and feeding of the grinding do not need to be stopped, and the continuous operation of grinding is realized, thereby improving the production efficiency of ITO powder; 2. When the screen plate is driven to vibrate, the driving shaft drives the cam to rotate through the transmission member. The cam pushes the screen plate downward and squeezes the telescopic spring to contract. When the cam rotates to disengage from the screen plate, the telescopic spring pushes the screen plate upward. This process is repeated to achieve continuous vibration of the screen plate, thereby accelerating the screening of the material flowing out of the discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a process flow chart of the production of indium tin oxide powder according to an embodiment of the present application.

[0023] Figure 2 This is a flow chart of an indium tin oxide powder production device according to an embodiment of the present application.

[0024] Figure 3 It is a schematic diagram for showing the structure of the grinding unit.

[0025] Figure 4 is along Figure 3 Section view along line AA.

[0026] Figure 5 yes Figure 3 Enlarged view of part B in the middle.

[0027] Figure 6 It is a schematic diagram used to show the structure of the sieve plate.

[0028] Figure 7 is along Figure 6 Sectional view along the CC line.

[0029] Description of reference numerals: 2, grinding frame; 21, discharge port; 22, feed port; 3, grinding unit; 31, grinding cylinder; 32, grinding roller; 33, driving member; 331, driving motor; 332, driving shaft; 34, grinding surface; 35, grinding space; 36, wedge-shaped space; 6, drying and dehydration unit; 7, screening unit; 71, sieve plate; 72, vibration unit; 721, cam; 722, telescopic spring; 73, baffle; 74. Support plate; 75. Sliding plate; 76. Driving platform; 77. Transmission member; 771. First bevel gear; 772. Second bevel gear; 773. Gear shaft; 8. Circulation unit; 81. Circulation box; 82. Guide plate; 83. Rotating ring cylinder; 84. Partition; 85. Storage trough; 86. Dropping port; 87. Guide member; 871. Guide pipe; 881. Rotating motor; 882. Driving gear; 883. Driven rack. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-7 This application is described in further detail.

[0031] The embodiment of the present application discloses a process for producing indium tin oxide powder.

[0032] Reference Figure 1 , a process for producing indium tin oxide powder, comprising the following steps: S1. Indium chemistry: Heat and melt the indium ingot to obtain liquid indium.

[0033] S2, oxidation reaction: the liquid indium obtained in step S1 is put into a DC arc furnace to react with oxygen to generate atomized indium tin oxide; S2.1 Insert the electrode: insert the electrode rod into the furnace cavity; S2.2 Adding liquid indium: Put liquid indium and indium tin oxide together into the crucible of the DC arc furnace and close the furnace cover; S2.3 Vacuuming: Pump the vacuum degree in the furnace chamber to 10-15Pa, and stop vacuuming; S2.4 Cover plate heating: raise the furnace cover plate to 800-900℃; S2.5 Gas introduction: continuously introduce Ar-O2 mixed gas into the furnace chamber; S2.6 Oxidation reaction: Move the electrode rod to the vicinity of the crucible, strike an arc and ignite, so that indium reacts with oxygen to generate atomized indium tin oxide; by adjusting the voltage and / or current, the temperature of the oxidation reaction is controlled at 1300-1800°C; during the entire reaction process, the reaction temperature changes dynamically, rising evenly from the initial 1300°C to 1800°C.

[0034] S3, sedimentation: passing the atomized indium tin oxide into a sedimentation device to sediment the coarse indium tin oxide particles; The condenser is turned on to allow the atomized indium tin oxide to pass through the condenser into a water-cooled sedimentation device. The temperature of the condenser is 700-750°C.

[0035] S4, cyclone separation: the indium tin oxide treated in step S3 is passed into a cyclone separator to separate the coarse indium tin oxide particles.

[0036] S5, bag recovery: the indium tin oxide treated in step S4 is passed into a bag recovery device for cooling and recovery to obtain indium tin oxide particles.

[0037] S6, powder processing: After the indium tin oxide particles are ground by the grinding unit (3), they are screened by the screening unit, and the ITO powder that meets the required particle size is dried and dehydrated by the drying and dehydration unit (6) and then collected. The ITO powder that does not meet the required particle size is returned to the grinding unit (3) through the circulation unit (8) and ground again to obtain the required particle size and morphology.

[0038] The embodiment of the present application discloses an indium tin oxide powder production device.

[0039] Reference Figure 2 , Figure 3 A process and equipment for producing indium tin oxide powder includes a grinding frame 2 and a grinding unit 3, a screening unit 7, a circulation unit 8, and a drying and dehydration unit 6 arranged on the grinding frame 2. The grinding unit 3 is used to receive ITO particles and grind them into ITO particle powder. The grinding unit 3 is provided with a discharge port 21 and a feed port 22. The screening unit 7 is arranged at the outlet of the grinding unit 3 and is used to separate the ITO particles from the ITO powder. The circulation unit 8 is used to receive the ITO particles screened out by the screening unit 7 and transport the ITO particles to the feed port 22 of the grinding unit 3. The ITO powder that meets the particle size is dried by the drying and dehydration unit 6 and then collected.

[0040] The formed ITO particles enter the grinding unit 3 for grinding to form a mixture of particles and powder, and then enter the screening unit 7. The screening unit 7 screens out the ITO powder that meets the predetermined particle size. The ITO particles enter the circulation unit 8 and flow back to the feed port 22 of the grinding unit 3 through the circulation unit 8 to enter the grinding unit 3 for further grinding. The screened ITO powder enters the drying and dehydration unit 6 for drying to form ITO powder, completing the production of ITO powder. By flowing the ITO particles in the discharge of the grinding unit 3 back into the grinding unit 3 for further grinding, the discharge and feed of the grinding do not need to be stopped, thereby realizing continuous grinding operation and improving the efficiency of metal grinding.

[0041] Reference Figure 3 , Figure 4The grinding unit 3 in this embodiment includes a grinding cylinder 31 and a grinding roller 32. The grinding cylinder 31 is fixedly arranged on the grinding frame 2 along the vertical direction. The bottom of the grinding cylinder 31 is a conical structure. There are two feed ports 22, both of which are located at the top of the grinding cylinder 31. One feed port 22 is used to receive the ITO particles after heat treatment, and the other feed port 22 is used to receive the ITO particles that have been circulated. The discharge port 21 is located at the bottom of the grinding cylinder 31, so that the ITO particles flow in the grinding cylinder 31 driven by gravity. A driving member 33 is provided on the grinding frame 2. The driving member 33 in this embodiment includes a driving motor 331 and a driving shaft 332. The output shaft of the driving motor 331 is arranged along the vertical direction and is colinear with the axis of the grinding cylinder 31. The driving shaft 332 is coaxially fixed on the output shaft of the driving motor 331. The grinding roller 32 is coaxially fixed on the driving shaft 332, and extends into the grinding cylinder 31, and forms a channel for ITO particles to pass through between the side and the cylinder wall of the grinding cylinder 31. The bottom of the grinding cylinder 31 is provided with a grinding surface 34, and the grinding surface 34 is formed by coating a wear-resistant coating on the grinding roller 32 to increase the rigidity and strength of the grinding surface 34. The grinding surface 34 is a conical surface with a small end facing downward, and a grinding space 35 is formed between the grinding surface 34 and the inner side wall of the bottom of the grinding cylinder 31. A wedge-shaped space 36 is formed between the grinding roller 32 and the inner wall of the grinding cylinder 31, and the wedge-shaped space 36 is located above the grinding space 35. The large end of the wedge-shaped space 36 is connected to the grinding space 35, and the ITO particles enter the grinding space 35 along the small end of the wedge-shaped space 36 for grinding, thereby improving the convenience of ITO particles entering the grinding space 35 for grinding.

[0042] When grinding the ITO particles, the driving motor 331 is turned on. The driving motor 331 drives the grinding roller 32 to rotate through the driving shaft 332 to drive the grinding roller 32. The ITO particles enter the grinding space 35 under the action of gravity, and then the ITO particles in the grinding space 35 are ground through the grinding surface 34. After the ITO particles are ground, they are discharged from the discharge port 21, so that the grinding and discharging do not need to be stopped, thereby improving the convenience of grinding feeding and discharging.

[0043] Reference Figure 4 The screening unit 7 in this embodiment includes a screen plate 71 and a vibration unit 72. The material is discharged from the discharge port 21 through a pipeline toward the center of the grinding cylinder 31. The screen plate 71 is slidably arranged on the grinding frame 2 through the vibration unit 72. The screen plate 71 is inclined with respect to the horizontal plane, and baffles 73 are arranged at three edges except the lowest edge, which can effectively prevent the material from escaping from the screen plate 71. The highest end of the screen plate 71 is located below the discharge port 21, so that the material flowing out of the discharge port 21 can flow along the inclined direction of the screen plate 71.

[0044] Reference Figure 3 , Figure 5 The vibration unit 72 in this embodiment includes a cam 721 and a telescopic spring 722. A support plate 74 is provided on the grinding frame 2. A sliding plate 75 is fixedly provided at the bottom of the screen plate 71. The sliding plate 75 passes through the support plate 74 and is slidably connected to the support plate 74. The telescopic spring 722 is arranged between the screen plate 71 and the support plate 74. One end of the telescopic spring 722 is fixedly connected to the support plate 74, and the other end is fixedly connected to the screen plate 71. The sliding plate 75 is bent at one end below the support plate 74 to form a driving platform 76. The cam 721 is rotatably arranged on the support plate 74 and is located above the driving platform 76. The sliding plate 75 is driven by the raised portion of the cam 721 to drive the screen plate 71 downward, so that the telescopic spring 722 is pressed downward and contracted. When the raised portion of the cam 721 is separated from the driving platform 76, the telescopic spring 722 pushes the screen plate 71 upward to move, so that the screen plate 71 vibrates.

[0045] Reference Figure 3 , Figure 5 The driving shaft 332 passes through the bottom of the grinding cylinder 31, and the driving shaft 332 is connected to the cam 721 through a transmission member 77. The transmission member 77 in this embodiment includes a first bevel gear 771, a second bevel gear 772 and a gear shaft 773. The gear shaft 773 is rotatably set on the bottom wall of the support plate 74 through a rotating support. The gear shaft 773 is fixedly connected to the cam 721 and drives the cam 721 to rotate. The first bevel gear 771 is coaxially fixedly set on the end of the driving shaft 332 extending out of the grinding cylinder 31, and the second bevel gear 772 is coaxially fixedly set on the gear shaft 773. The first bevel gear 771 is meshed with the second bevel gear 772. When the driving shaft 332 rotates, the screen plate 71 is driven to vibrate at the same time.

[0046] The material flowing out of the discharge port 21 enters the sieve plate 71, and the ITO powder that meets the predetermined particle size falls into the drying and dehydration unit 6. The sieve plate 71 screens out the ITO particles with large particle size and moves along the sieve plate 71. The drive shaft 332 drives the cam 721 to rotate through the transmission member 77. The cam 721 pushes the sieve plate 71 downward and squeezes the telescopic spring 722 to contract. When the cam 721 rotates to disengage from the sieve plate 71, the telescopic spring 722 pushes the sieve plate 71 upward, and this process is repeated to achieve continuous vibration of the sieve plate 71, thereby accelerating the screening of the material flowing out of the discharge port 21, improving the screening efficiency of the sieve plate 71, and effectively preventing ITO particles from clogging the sieve plate 71.

[0047] Reference Figure 6 , Figure 7The circulation unit 8 in this embodiment includes a circulation box 81 and a guide plate 82. A rotating ring cylinder 83 is provided on the grinding frame 2 along the vertical direction. The rotation axis of the rotating ring cylinder 83 is set along the horizontal direction. The circulation box 81 is annular and embedded in the rotating ring cylinder 83. It is slidably connected with the rotating ring cylinder 83, and the rotating ring cylinder 83 guides the rotation of the circulation box 81. A plurality of partitions 84 are provided in the circulation box 81, and the plurality of partitions 84 divide the circulation box 81 into a plurality of storage slots 85. The lowest end of the sieve plate 71 is located above the storage slot 85 at the lowest point of the circulation box 81, so that the sieve plate 71 can guide the ITO particles to fall into the storage slot 85. The guide plate 82 is fixedly arranged on the rotating ring cylinder 83 and is slidingly arranged in contact with the circulation box 81. The guide plate 82 is arranged along the circumference of the rotating ring cylinder 83 for a section, and the guide plate 82 can block the opening of the storage slot 85. A drop port 86 is provided at the highest point of the guide plate 82, and the storage slot 85 can move the ITO particles along the guide plate 82 to the drop port 86. A guide member 87 is provided on the grinding frame 2, and the guide member 87 is used to receive the ITO particles dropped from the drop port 86 and guide them to the feed port 22 of the grinding cylinder 31.

[0048] Reference Figure 3 The guide member 87 in this embodiment includes a guide pipe 871 arranged on the grinding frame 2, and the guide pipe 871 is inclined with respect to the horizontal plane. The highest end of the guide pipe 871 is located below the drop port 86, and the lowest end is located above the feed port 22.

[0049] Reference Figure 6 , Figure 7 A rotating motor 881 is fixed on the rotating ring cylinder 83, and a driving gear 882 is coaxially fixed on the output shaft of the rotating motor 881. A driven rack 883 is arranged along its circumference on the circulation box 81. The driven rack 883 is embedded in the back of the circulation cylinder, and the driving gear 882 passes through the rotating ring cylinder 83 and meshes with the driven rack 883.

[0050] The ITO particles sieved out by the sieve plate 71 enter the storage tank 85, and then the rotating motor 881 drives the circulation box 81 to rotate through the engagement of the driving rack and the driven rack 883, and the circulation box 81 drives the storage tank 85 to move toward the drop port 86. In this process, the guide plate 82 blocks the opening of the storage tank 85, which can prevent the ITO particles from falling from the storage tank 85, so that the storage tank 85 can stably transport the ITO particles to the drop port 86. When the storage tank 85 moves to the drop port 86, the ITO particles in the storage tank 85 fall from the drop port 86 and enter the grinding cylinder 31 through the drop port 86 under the guidance of the guide pipe 871 for secondary grinding. This process is repeated to achieve continuous grinding of the ITO particles and improve the grinding efficiency of the ITO particles.

[0051] The implementation principle of an indium tin oxide powder production process and equipment in an embodiment of the present application is as follows: the ITO particles formed after heat treatment enter the grinding unit 3 for grinding to form a mixture of particles and powder, and then enter the screening unit 7. The screening unit 7 screens out the ITO powder that meets the predetermined particle size. The ITO particles enter the circulation unit 8 and flow back to the feed port 22 of the grinding unit 3 through the circulation unit 8 to enter the grinding unit 3 for further grinding. The screened ITO powder enters the drying and dehydration unit 6 for drying to form ITO powder, completing the production of ITO powder. By returning the ITO particles in the discharge of the grinding unit 3 to the grinding unit 3 for further grinding, the discharge and feed of the grinding unit do not need to be stopped, thereby realizing continuous grinding operation and improving the efficiency of metal grinding.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A process for producing indium tin oxide powder, characterized in that: The steps include: S1. Indium tin: Heat and melt the indium tin ingot to obtain liquid indium tin; S2, oxidation reaction: the liquid indium tin obtained in step S1 is put into a DC arc furnace to react with oxygen to generate atomized indium tin oxide; S3, sedimentation: passing the atomized indium tin oxide into a sedimentation device to sediment the coarse indium tin oxide particles; S4, cyclone separation: passing the indium tin oxide treated in step S3 into a cyclone separator to separate the coarse indium tin oxide particles; S5, bag recovery: passing the indium tin oxide treated in step S4 into a bag recovery device for cooling and recovery to obtain indium tin oxide particles; S6, powder processing: After the indium tin oxide particles are ground by the grinding unit (3), they are screened by the screening unit, and the ITO powder that meets the required particle size is dried and dehydrated by the drying and dehydration unit (6) and then collected. The ITO powder that does not meet the required particle size is returned to the grinding unit (3) through the circulation unit (8) and ground again to obtain the required particle size and morphology.

2. The process for producing indium tin oxide powder according to claim 1, characterized in that: In step S2, the temperature of the oxidation reaction is controlled at 1300-1800°C by adjusting the voltage and / or current.

3. The process for producing indium tin oxide powder according to claim 1, characterized in that: In step S3, the condenser is turned on to allow the atomized indium tin oxide to enter the water-cooled sedimentation device through the condenser. The temperature of the condenser is 700-750°C.

4. An indium tin oxide powder production device, using the indium tin oxide powder production process according to any one of claims 1 to 3, characterized in that: The invention comprises a grinding frame (2), a grinding unit (3), a screening unit (7), a circulation unit (8), and a drying and dehydration unit (6) arranged on the grinding frame (2); the grinding unit (3) is used for receiving ITO particles and grinding them into ITO particle powder; the grinding unit (3) is provided with a discharge port (21) and a feed port (22); the screening unit (7) is arranged at the outlet of the grinding unit (3) and is used for separating the ITO particles from the ITO powder; the circulation unit (8) is used for receiving the ITO particles screened out by the screening unit (7) and conveying the ITO particles to the feed port (22) of the grinding unit (3); the ITO powder screened out by the screening unit (7) enters the drying and dehydration unit (6).

5. The indium tin oxide powder production equipment according to claim 4, characterized in that: The grinding unit (3) comprises a grinding cylinder (31) and a grinding roller (32); the grinding cylinder (31) is fixedly arranged on the grinding frame (2); the grinding roller (32) is rotatably arranged on the grinding frame (2) and is located in the grinding cylinder (31); a grinding surface (34) is provided on the grinding roller (32); a grinding space (35) is formed between the grinding surface (34) and the inner wall of the grinding cylinder (31); the discharge port (21) and the feed port (22) are both arranged on the grinding cylinder (31); after the ITO particles are ground in the grinding space (35), they are discharged from the discharge port (21); and a driving member (33) for driving the grinding roller (32) to rotate is provided on the grinding frame (2); A wedge-shaped space (36) is formed between the grinding roller (32) and the inner wall of the grinding cylinder (31), and the wedge-shaped space (36) is arranged upstream of the grinding space (35) along the flow direction of the ITO particles, and the large end of the wedge-shaped space (36) is connected to the grinding space (35).

6. The indium tin oxide powder production equipment according to claim 5, characterized in that: The screening unit (7) comprises a screen plate (71) and a vibration unit (72); the screen plate (71) is slidably arranged on the grinding frame (2) and is used to receive the material flowing out of the discharge port (21); the screen plate (71) is arranged to be inclined with respect to a horizontal plane so that the material can flow along the screen plate (71); and the vibration unit (72) is used to drive the screen plate (71) to vibrate.

7. The indium tin oxide powder production equipment according to claim 6, characterized in that: The vibration unit (72) comprises a cam (721) and a telescopic spring (722); the telescopic spring (722) is arranged on the grinding frame (2) and connected to the sieve plate (71) and is used to push the sieve plate (71) upward; the cam (721) is rotatably arranged on the grinding frame (2) and is used to press down the sieve plate (71) and is capable of being detached from the sieve plate (71); the cam (721) is connected to the drive shaft (332) via a transmission member (77); and the drive shaft (332) drives the cam (721) to rotate via the transmission member (77).

8. The indium tin oxide powder production equipment according to claim 7, characterized in that: The transmission member (77) comprises a first bevel gear (771), a second bevel gear (772) and a gear shaft (773); the drive shaft (332) passes through the grinding cylinder (31); the first bevel gear (771) is coaxially fixedly arranged at one end of the drive shaft (332) extending out of the grinding cylinder (31); the gear shaft (773) is fixedly arranged on the rotation axis of the cam (721); the second bevel gear (772) is coaxially fixedly arranged on the gear shaft (773) and meshes with the first bevel gear (771).

9. The indium tin oxide powder production equipment according to claim 7, characterized in that: The circulation unit (8) comprises a circulation box (81) and a guide plate (82); a plurality of partitions (84) are arranged in the circulation box (81); the plurality of partitions (84) divide the circulation box (81) into a plurality of storage slots (85); the circulation box (81) is rotatably arranged on the grinding frame (2); the sieve plate (71) can guide the ITO particles to fall into the storage slots (85); the guide plate (82) is arranged on the grinding frame (2); the guide plate (82) and the The circulation box (81) is arranged to slide in close contact with the storage tank (85), and can block the opening of the storage tank (85); the guide plate (82) is provided with a material drop opening (86); the storage tank (85) can move the ITO particles along the guide plate (82) to the material drop opening (86); the grinding frame (2) is provided with a guide member (87); the guide member (87) is used to receive the ITO particles dropped from the material drop opening (86) and guide them to the feed opening (22) of the grinding cylinder (31); The guide member (87) comprises a guide pipe (871) arranged on the grinding frame (2), the guide pipe (871) being arranged at an inclination relative to a horizontal plane, the highest end of the guide pipe (871) being located below the drop port (86), and the lowest end being located above the feed port (22).

10. The indium tin oxide powder production equipment according to claim 9, characterized in that: The grinding frame (2) is provided with a rotating motor (881), the output shaft of the rotating motor (881) is coaxially fixed with a driving gear (882), the circulation box (81) is provided with a driven rack (883) arranged along its circumference, and the driving gear (882) is meshed with the driven rack (883).

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