Indium oxide coarse powder refining device and recycling system

Abstract

The invention relates to the technical field of indium oxide production, and discloses an indium oxide coarse powder refining device and recycling system which comprises a screening box, a screen, a coarse powder channel, a recycling channel and a refining device. The outlet is formed in the position above the screen of the screening box, the outlet and the feeding port of the screening box are located at the two ends, screened coarse powder can be conveyed to the temporary storage tank, the control valve is opened after the temporary storage tank is full, the coarse powder enters the refining cavity in the tank body, and fan blades in the refining cavity rotate at a high speed to generate centrifugal force; coarse powder particles are driven to collide with each other or collide with a tank body and are matched with a stop lever to generate shearing force to shear the coarse powder particles, and meanwhile, impact force and microjet generated by the cavitation effect of ultrasound are utilized in the process to damage the agglomeration effect among the particles, all the structures act jointly, and therefore the particle size of the coarse powder particles is reduced. The large-particle indium oxide coarse powder is effectively decomposed into small particles, so that the caked indium oxide coarse powder is refined.

Description

Technical Field

[0001] The invention relates to the technical field of indium oxide production, and in particular to a device for refining coarse indium oxide powder and a recycling system. Background Art

[0002] ITO target is a black-gray ceramic semiconductor target made of indium oxide powder and tin oxide powder through compression molding and sintering. It is an important raw material for the production of ITO film. Before production, a large amount of indium oxide powder, tin oxide powder and pure water are required to be emulsified and dispersed into ITO slurry, which is then ground into the particle size range required by the standard by a sand mill, and then sprayed and dried to form an important semi-finished raw material powder of ITO target.

[0003] Indium oxide powder is made by dissolving indium ingot metal in nitric acid and neutralizing it with ammonia water to form slurry-like indium hydroxide, which is then spray-dried to form indium hydroxide powder, and then calcined at 200℃-800℃ in a kiln to form indium oxide powder. However, during the neutralization, spray granulation, and high-temperature calcination of indium oxide, some powder particles will be larger, or small particles will agglomerate to form large particles, which are coarse indium oxide powder. Due to its large particle size, coarse indium oxide powder cannot be used as a raw material for preparing ITO targets. Therefore, after the preparation of indium oxide powder, it needs to be screened out by a vibrating screen to separate coarse powder and fine powder. Coarse powder is usually recovered by chemical reduction. However, the process of chemical reduction consumes a lot of manpower and material resources, and the recycling efficiency is low.

[0004] SUMMARY OF THE INVENTION

[0005] The technical problem solved by the present invention is that after the indium oxide powder is prepared, it needs to be screened out into coarse powder and fine powder through a vibrating screen. The coarse powder is usually recycled by chemical reduction. However, the process of chemical reduction consumes a lot of manpower and material resources, and the recycling efficiency is low.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An indium oxide coarse powder refining device, comprising:

[0008] A tank body, wherein a thinning chamber is enclosed in the tank body, a feed channel communicating with the thinning chamber is provided at one end of the tank body, and a discharge channel communicating with the thinning chamber is provided at the other end;

[0009] A baffle rod, the baffle rod is fixedly connected to the tank body, and the direction of the baffle rod intersects with the direction in which the indium oxide coarse powder moves in the refinement chamber;

[0010] An outer sleeve, the outer sleeve being rotatably disposed in the tank body;

[0011] A rotating shaft, the rotating shaft being rotatably disposed in the outer sleeve;

[0012] A plurality of fan blades, wherein the fan blades are respectively fixedly arranged on the outer sleeve and the rotating shaft, and a refinement gap is formed between the fan blades and the blocking rod, and the refinement gap is smaller than the particle size of the indium oxide coarse powder;

[0013] A power assembly is used to drive the outer sleeve and the rotating shaft to rotate in opposite directions.

[0014] In one embodiment of the present invention, an ultrasonic generator is provided on the tank body.

[0015] In one embodiment of the present invention, there is a conical transition between the refinement chamber and the discharge channel.

[0016] In one embodiment of the present invention: the power assembly includes a power source, an upper gear and a lower gear, the power source drives and connects to a driving gear, the upper gear is fixedly connected to the rotating shaft, the lower gear is fixedly connected to the outer sleeve, and the driving gear is located between the upper gear and the lower gear and meshes with the upper gear and the lower gear respectively.

[0017] In one solution of the present invention: a cooling chamber is provided in the tank body, and the cooling chamber is connected to the cooling oil controller through a pipeline.

[0018] In one embodiment of the present invention, the pipeline includes an oil inlet pipe and an oil return pipe, wherein the oil inlet pipe is located at the lower end of the tank body, and the oil return pipe is connected to the upper end of the tank body.

[0019] In one embodiment of the present invention, one end of the feed channel away from the tank body is connected to the temporary storage tank, and a cooling fan is provided outside the temporary storage tank.

[0020] In one solution of the present invention: a breathing valve is respectively provided on the tank body and the temporary storage tank.

[0021] In one solution of the present invention, two groups of fan blades are respectively arranged on the outer sleeve and the rotating shaft.

[0022] A system for recycling indium oxide coarse powder, comprising:

[0023] A screening box, wherein a screening chamber is provided in the vibrating screen;

[0024] A screen, wherein the screen is fixedly disposed in the screening box and separates the screening chamber into an upper chamber and a lower chamber;

[0025] a coarse powder channel, one end of which is in communication with the upper chamber, and the other end of which is in communication with the feed channel of the tank body;

[0026] A recovery channel, one end of which is connected to the discharge channel of the tank body, and the other end of which is connected to the upper chamber.

[0027] Beneficial effects of the present invention:

[0028] The present application sets an outlet above the screen of the screening box, and the outlet and the feed port of the screening box are at two ends, so that the coarse powder screened out can be transported to the temporary storage tank. After the temporary storage tank is full, the control valve is opened, and the coarse powder enters the refinement chamber in the tank body. The fan blades therein rotate at high speed to generate centrifugal force, causing the coarse powder particles to collide with each other or with the tank body, and cooperate with the baffle to generate shear force to shear the coarse powder particles. At the same time, in this process, the impact force and micro jet generated by the cavitation of the ultrasound are used to destroy the agglomeration between the particles. Each structure works together to effectively decompose the larger granular indium oxide coarse powder into small particles, thereby realizing the refinement of the agglomerated indium oxide coarse powder. And this device can be directly set on the production line of indium oxide powder, and the screened indium oxide coarse powder is passed into the refinement device for refinement, and then returned to the screening position after refinement, so as to realize the efficient and online recycling of indium oxide coarse powder, and effectively improve the output rate of indium oxide powder.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 It is a structural schematic diagram of the indium oxide coarse powder recycling system of the present invention;

[0032] Figure 2 It is a schematic structural diagram of the device for refining the coarse indium oxide powder of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the fan blade of the present invention when viewed from above.

[0034] The reference numerals in the figure are: 1, screening box; 2, screen; 3, recovery channel; 4, tank body; 5, baffle rod; 6, outer sleeve; 7, rotating shaft; 8, fan blade; 9, power assembly; 10, ultrasonic generator; 11, cooling oil controller; 12, temporary storage tank. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] See also Figure 1-3 The present invention is a system for recycling indium oxide coarse powder, comprising: a screening box 1, a screen 2, a coarse powder channel, a recovery channel 3 and a refinement device. A screening chamber is provided in the screening box 1, and the screening box 1 can be arranged on the base of a vibrating screen to complete the screening of coarse powder and fine powder; a feed port can be provided on the upper side of the screening box 1 for feeding the unscreened indium oxide powder. The screen 2 is fixedly arranged in the screening box 1, and the screening chamber is divided into an upper chamber and a lower chamber; the upper chamber is connected to the feed port and is used as a screening chamber, and the lower chamber at the lower end is the screened fine powder chamber, and a fine powder channel can be provided to communicate with the finished powder storage tank. One end of the coarse powder channel is connected to the upper chamber, and the other end is connected to the feed channel of the refinement device; thereby the screened coarse powder is transported to the refinement device for online refinement. One end of the recovery channel 3 is connected to the discharge channel of the refinement device, and the other end is connected to the upper chamber. The refining device is used to refine the screened coarse powder online and then discharge it through the discharge channel. The recovery channel 3 can be provided with a suction pump to transport the refined indium oxide powder discharged from the refining device to the upper chamber for re-screening.

[0039] In the neutralization, spray granulation, and high-temperature calcination stages of indium oxide, some powder particles will be larger, or small particles will be in a clumping shape, and will not be able to pass through the sieve 2, so it is defined as coarse indium oxide powder. Generally speaking, coarse indium oxide powder cannot be used as a raw material for preparing ITO targets due to its large particle size, and is often recycled by chemical reduction. However, this process consumes a lot of manpower and material resources. From the perspective of the output ratio of coarse and fine powders, the coarse powder ratio is about 12%, and the coarse powder accounts for a large proportion, which seriously affects the output. At present, there is no effective means to control the generation of coarse powder, and there is no effective method for on-site recycling. In order to solve the above problems, the present application proposes a coarse indium oxide powder recycling system. The device can be directly set on the production line of indium oxide powder, and the screened indium oxide coarse powder is passed through a refinement device for refinement, and then returned to the screening position after refinement, so as to realize the efficient and online recycling of indium oxide coarse powder, and effectively improve the output rate of indium oxide powder.

[0040] See also Figure 1-3 In one embodiment of the present invention, a device for refining indium oxide coarse powder as described above comprises: a tank body 4, a baffle 5, an outer sleeve 6, a rotating shaft 7, a plurality of blades 8 and a power assembly 9. A refining chamber is enclosed in the tank body 4, one end of the tank body 4 is provided with a feed channel connected to the refining chamber, and the other end is provided with a discharge channel connected to the refining chamber; the baffle 5 is fixedly connected to the tank body 4, and the direction of the baffle 5 intersects with the direction in which the indium oxide coarse powder moves in the refining chamber; the outer sleeve 6 is rotatably arranged in the tank body 4; the rotating shaft 7 is rotatably arranged in the outer sleeve 6; the blades 8 are respectively fixedly arranged on the outer sleeve 6 and the rotating shaft 7, and a refining gap is formed between the blades 8 and the baffle 5, and the refining gap is smaller than the particle size of the indium oxide coarse powder; the power assembly 9 is used to drive the outer sleeve 6 and the rotating shaft 7 to rotate in the opposite direction.

[0041] After the equipment is started, the power assembly 9 drives the outer sleeve 6, the rotating shaft 7 and the blades 8 thereon to rotate at high speed, and the coarse indium oxide powder screened by the screening box 1 is transported to the tank body 4 through the coarse powder channel and the feed channel. The coarse powder particles transported to the tank body 4 pass through the area where the blades 8 and the baffle 5 are located during the falling process. The high-speed rotating blades 8 and the baffle 5 work together. The centrifugal force generated by the blades 8 and the shearing effect between the blades 8 and the baffle 5 will decompose the larger granular indium oxide coarse powder into small particles that fall into the bottom of the tank body 4, and then are discharged through the discharge channel for recycling. The blades 8 and the baffle 5 can be made of wear-resistant and durable zirconium oxide material.

[0042] See also Figure 1-3In one embodiment of the present invention, the refinement chamber can be a columnar structure, or a cylindrical structure, and a conical transition can be formed between the refinement chamber and the discharge channel to form a conical chamber for accommodating the powder after the initial breaking of the fan blade 8. An ultrasonic generator 10 can be provided on the tank body 4 to generate ultrasonic waves in the tank body 4. The super artifact can be set at the location of the conical chamber. Since the coarse powder is mostly formed by the agglomeration of indium oxide particles and water that cannot be completely eliminated, the device uses the impact force and microjets generated by the cavitation effect of ultrasound to destroy the agglomeration between the particles. The coarse powder is fully refined in conjunction with the shearing action of the fan blades 8 and the baffle 5.

[0043] See also Figure 1-3 In one embodiment of the present invention, the fan blade 8 can be tilted, and it can cooperate with the top of the lower baffle 5 to play a shearing role. The fan blade 8 can also cooperate with the upper and lower baffles 5 at the same time, that is, the upper end of the fan blade 8 cooperates with the bottom end of the upper baffle 5 to shear the coarse powder particles, and the lower end of the fan blade 8 cooperates with the top of a baffle 5 below to shear the coarse powder particles, so as to effectively improve the refinement efficiency and refinement effect of the coarse powder. Correspondingly, the baffle 5 should have edges that cooperate with the fan blade 8, and the top and / or bottom of the baffle 5 can be set to a plane, or the baffle 5 can be set to a square. Other shapes with shearing edge structures can also be set. The position of multiple baffles 5 at the same layer height located at the center of the tank body 4 can be fixedly connected and set to a cylindrical structure, and the outer sleeve 6 and the rotating shaft 7 can be located in the cylindrical structure to ensure stability.

[0044] See also Figure 1-3 In one embodiment of the present invention, the outer sleeve 6 can be rotatably arranged on the tank body 4, the rotating shaft 7 can be rotatably arranged in the outer sleeve 6, and the outer sleeve 6 and the baffle 5 can also be supported by the cylindrical structure formed by the baffle 5, and the outer sleeve 6 and the baffle 5 can be provided with a step structure for position support in the up and down directions. At the same time, the gap between the fan blade 8 and the baffle 5 can be adjusted by adjusting the height position of the outer sleeve 6 and the baffle 5. And the rotation speed of the outer sleeve 6 and the rotating shaft 7 can be consistent, such as working at a speed of 200rpm / min, and the rotation direction is opposite. In this way, the coarse powder can be refined more efficiently. Two sets of fan blades 8 can be provided on the outer sleeve 6 and the rotating shaft 7, respectively.

[0045] See also Figure 1-3In one embodiment of the present invention, the outer sleeve 6 and the rotating shaft 7 can be driven separately or simultaneously through a transmission structure. As an example, the power assembly 9 may include a power source, an upper gear and a lower gear. The power source drives the connecting driving gear, the upper gear is fixedly connected to the rotating shaft 7, the lower gear is fixedly connected to the outer sleeve 6, and the driving gear is located between the upper gear and the lower gear and meshes with the upper gear and the lower gear respectively. The power source drives the driving gear to rotate, and the driving gear drives the upper gear and the lower gear to rotate in the opposite direction at the same time, thereby driving the outer sleeve 6 and the rotating shaft 7 to drive the fan blades 8 thereon to rotate.

[0046] See also Figure 1-3 In one embodiment of the present invention, a cooling chamber may be provided in the tank body 4, and the cooling chamber is connected to the cooling oil controller 11 through a pipeline. The cooling oil controller 11 is used to control the cooling oil to enter the cooling chamber and circulate. The tank body 4 is cooled by the cooling oil circulating in the cooling chamber, and then the refinement chamber is cooled. Using cooling oil as a medium can obtain more stable and accurate temperature control, avoid the formation of condensed water in the tank body 4 caused by temperature fluctuations, and the condensed water will cause the powder to agglomerate again to form coarse powder. The pipeline may include an oil inlet pipe and an oil return pipe, the oil inlet pipe is located at the lower end of the tank body 4, and the oil return pipe is connected to the upper end of the tank body 4. The cooling oil enters from the bottom and exits from the top, and the cooling oil circulation is more stable. At the same time, it is opposite to the coarse powder direction, which can better achieve the cooling effect. The end of the feed channel away from the tank body 4 is connected to the temporary storage tank 12, and a cooling fan is arranged on the outside of the temporary storage tank 12. The coarse powder in the temporary storage tank 12 is initially cooled by the cooling fan.

[0047] See also Figure 1-3 In one embodiment of the present invention, since the device can be arranged on the production line, and since the previous process of screening is high-temperature calcination, the temperature of the coarse powder just screened out is relatively high, which leads to an increase in the temperature of the refining chamber, the fan blades 8, and the baffle 5 during the refining process. The fan blades 8 and the baffle 5 continue to work in a high-temperature environment, which will lead to accelerated wear, and then lead to impurities in the indium oxide powder. Therefore, the provision of a temporary storage tank 12 can temporarily store and cool the coarse powder, and the provision of a cooling chamber can cool the refining chamber. Breathing valves can be respectively provided on the tank body 4 and the temporary storage tank 12. The outlet of the temporary storage tank 12 and the outlet of the tank body 4 can be respectively provided with solenoid valves for controlling the opening and closing of the relevant feed and discharge channels. The control valve of the temporary storage tank 12 can be opened after the temporary storage tank 12 is full to fully cool the coarse powder.

[0048] Working principle of the present invention:

[0049] The present application sets an outlet above the screen 2 of the screening box 1, and the outlet and the feed port of the screening box 1 are at two ends, so that the coarse powder screened out can be transported to the temporary storage tank 12. After the temporary storage tank 12 is full, the control valve is opened, and the coarse powder enters the refinement chamber in the tank body 4. The fan blades 8 therein rotate at high speed to generate centrifugal force, causing the coarse powder particles to collide with each other or with the tank body 4, and cooperate with the baffle 5 to generate shear force to shear the coarse powder particles. At the same time, in this process, the impact force and micro jet generated by the cavitation effect of ultrasound are used to destroy the agglomeration effect between the particles. Each structure works together to effectively decompose the larger granular indium oxide coarse powder into small particles, thereby realizing the refinement of the agglomerated indium oxide coarse powder. And this device can be directly set on the production line of indium oxide powder, and the screened indium oxide coarse powder is passed into the refinement device for refinement, and then returned to the screening position after refinement, so as to realize the efficient and online recycling of indium oxide coarse powder, and effectively improve the output rate of indium oxide powder.

[0050] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A device for refining indium oxide coarse powder, characterized in that: include: A tank body (4), wherein a thinning chamber is enclosed in the tank body (4), one end of the tank body (4) is provided with a feed channel communicating with the thinning chamber, and the other end of the tank body (4) is provided with a discharge channel communicating with the thinning chamber; A baffle rod (5), wherein the baffle rod (5) is fixedly connected to the tank body (4), and the direction of the baffle rod (5) intersects with the direction in which the indium oxide coarse powder moves in the refining chamber; an outer sleeve (6), the outer sleeve (6) being rotatably disposed in the tank body (4); A rotating shaft (7), the rotating shaft (7) being rotatably disposed in the outer sleeve (6); a plurality of fan blades (8), wherein the fan blades (8) are respectively fixedly arranged on the outer sleeve (6) and the rotating shaft (7), and a refinement gap is formed between the fan blades (8) and the blocking rod (5), and the refinement gap is smaller than the particle size of the indium oxide coarse powder; A power assembly (9) is used to drive the outer sleeve (6) and the rotating shaft (7) to rotate in opposite directions.

2. The device for refining indium oxide coarse powder according to claim 1, characterized in that: The tank body (4) is provided with an ultrasonic generator (10).

3. The device for refining indium oxide coarse powder according to claim 2, characterized in that: There is a conical transition between the attenuation chamber and the discharge channel.

4. The device for refining indium oxide coarse powder according to claim 1, characterized in that: The power assembly (9) comprises a power source, an upper gear and a lower gear, the power source drives and connects a driving gear, the upper gear is fixedly connected to the rotating shaft (7), the lower gear is fixedly connected to the outer sleeve (6), and the driving gear is located between the upper gear and the lower gear and meshes with the upper gear and the lower gear respectively.

5. The device for refining indium oxide coarse powder according to claim 1, characterized in that: A cooling chamber is provided in the tank body (4), and the cooling chamber is connected to a cooling oil controller (11) via a pipeline.

6. The device for refining indium oxide coarse powder according to claim 5, characterized in that: The pipeline comprises an oil inlet pipe and an oil return pipe, wherein the oil inlet pipe is located at the lower end of the tank body (4), and the oil return pipe is connected to the upper end of the tank body (4).

7. The device for refining indium oxide coarse powder according to claim 6, characterized in that: One end of the feed channel away from the tank body (4) is connected to the temporary storage tank (12), and a cooling fan is arranged on the outside of the temporary storage tank (12).

8. The device for refining indium oxide coarse powder according to claim 7, characterized in that: The tank body (4) and the temporary storage tank (12) are respectively provided with a breathing valve.

9. The device for refining indium oxide coarse powder according to claim 1, characterized in that: Two groups of fan blades (8) are respectively arranged on the outer sleeve (6) and the rotating shaft (7).

10. A recycling system based on the indium oxide coarse powder refining device according to any one of claims 1 to 9, characterized in that: include: A screening box (1), wherein a screening chamber is provided in the vibrating screen; A screen (2), wherein the screen (2) is fixedly arranged in the screening box (1) and separates the screening chamber into an upper chamber and a lower chamber; a coarse powder channel, one end of which is in communication with the upper chamber, and the other end of which is in communication with the feed channel of the tank body (4); A recovery channel (3), one end of which is in communication with the discharge channel of the tank body (4), and the other end of which is in communication with the upper chamber.

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