Method for recovering valuable metals in ITO waste target material

Abstract

The invention relates to a method for recycling valuable metals in an ITO waste target material, and relates to the field of secondary utilization of resources, the recycling method comprises the following steps: mixing ITO waste target material powder, a reducing agent, a solvent and an adhesive to obtain a mixture; forming the mixture, and then sequentially performing reduction and vacuum distillation to obtain an indium product and a tin product; wherein the molded body obtained by molding is a porous molded body. According to the recovery method provided by the invention, after the ITO waste target material powder is formed into the pore forming body, the material spraying phenomenon in the reduction process is effectively avoided, meanwhile, efficient recovery of valuable metal indium and tin is also realized, and an indium product with the purity being greater than or equal to 99.99% can be obtained through vacuum distillation.

Description

Technical Field

[0001] The present invention relates to the field of secondary resource utilization, and in particular to a method for recovering valuable metals in waste ITO targets. Background Art

[0002] In the reduction process of ITO (indium tin oxide) waste targets, the existing technology usually adopts the method of directly mixing coal powder or carbon powder with the ITO waste targets, and then sending it into a continuous reduction furnace for high-temperature reduction reaction. However, in actual production, this kind of powder that has not been subjected to finalization treatment is very prone to "spraying" in the reduction furnace. The so-called "spraying" refers to the fact that under high temperature and strong reducing atmosphere (mainly CO), due to the violent reaction, loose powder and lack of structural support, local gas channels are blocked, resulting in an instantaneous increase in gas pressure, thereby spraying some unreacted powder out of the material layer or even into the downstream area of ​​the furnace.

[0003] For example, CN104711638A discloses a method for extracting indium tin from waste ITO targets by reduction electrolysis, wherein a reducing substance is used to crush and ball-mill the waste ITO targets, and indium tin oxide is reduced to metallic indium and metallic tin in a reduction furnace, respectively. The specific steps are: crushing and ball-milling the waste ITO targets to obtain a powder with a particle size of more than 80% below -80 mesh; using a reducing substance to perform a reduction reaction on the powder in a reduction furnace, wherein the temperature of the reduction reaction is controlled at 200-1000°C, and the indium oxide and tin oxide are reduced to metallic indium and metallic tin, respectively. The reduction reaction here does not finalize the ingredients, resulting in the phenomenon of material spraying in the reaction, and cannot be used for the reduction of low-grade waste ITO targets.

[0004] CN110042229A discloses a method for recovering metallic indium from waste ITO target materials. The method involves washing, drying, and crushing the ITO target materials, then mixing a reducing agent powder with the waste ITO target materials and a binder. The mixture is then pressed into blocks and subjected to a reduction reaction in a vacuum melting furnace to produce alloy blocks and slag. The method involves mixing a 200-mesh waste target material with a 400-mesh reducing agent and a binder. The mixed material is placed in a mold, pressed into blocks, and placed in an alloy can. The can is then placed in a vacuum melting furnace, and vacuum reduction and melting are performed to produce metallic indium-tin alloy blocks and slag. Although this method is standardized, it does not form effective honeycomb-shaped pore channels, failing to increase reduction efficiency. This method utilizes vacuum reduction, which exploits the lowering of the boiling point of metals under vacuum conditions, and cannot achieve the same continuous reduction and feeding effect as a continuous reduction furnace. This method requires standardization due to the closed nature of vacuum furnaces, rather than being specifically designed for the spraying characteristics of conventional reduction furnaces.

[0005] CN114231743A discloses a method for preparing an indium-tin alloy by high-temperature reduction of waste ITO target material. The method involves crushing the bulk ITO target material into particles, then uniformly mixing the particles, a reducing agent, and a specific slag-forming agent. The mixture is then placed in an electric arc furnace for reduction smelting to obtain metallic indium and metallic tin. The batching method involves uniformly mixing the waste ITO target material particles, a reducing agent, and a slag-forming agent, then placing the mixture in an electric arc furnace for reduction smelting. This method also fails to consider the effects of shaping and subsequent spraying after material addition, and only involves simple mixing.

[0006] CN120043356A discloses a reduction furnace and reduction method for continuously reducing ITO waste targets to prepare indium tin alloys. This invention achieves safe and sustainable addition of reducing mixtures through the coordination of a small bell and a large bell. This method still involves mixing ITO waste target powder with a reducing agent, without considering shaping or resolving the problem of material spraying during the reduction furnace reaction.

[0007] In summary, the current reduction and recycling of ITO waste targets has the defect of "spraying", and the recovery effect of valuable metals indium and tin is still poor. Summary of the Invention

[0008] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for recovering valuable metals in ITO waste targets to solve the defect that when the ITO waste targets are reduced and recycled, the recovery effect of the valuable metals indium and tin is still poor while "spraying".

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] The present invention provides a method for recovering valuable metals in waste ITO target materials, the recovery method comprising:

[0011] Mixing ITO waste target powder, a reducing agent, a solvent and an adhesive to obtain a mixture;

[0012] The mixture is formed, and then reduced and vacuum distilled in sequence to obtain indium products and tin products;

[0013] Wherein, the formed body obtained by the forming is a porous formed body.

[0014] The recycling method provided by the present invention effectively avoids the occurrence of material spraying during the reduction process by shaping the ITO waste target powder into a porous molded body, while also achieving efficient recovery of the valuable metals indium and tin. An indium product with a purity of ≥99.99% can be obtained through vacuum distillation.

[0015] As a preferred technical solution of the present invention, the mass ratio of the reducing agent to the ITO waste target powder is (0.2-4):1.

[0016] Preferably, the mass ratio of the ITO waste target powder to the solvent is 1:(0.1-0.4).

[0017] Preferably, the mass ratio of the ITO waste target powder to the adhesive is 1:(0.02-0.1).

[0018] As a preferred technical solution of the present invention, the particle size of the particles with a mass percentage of more than 80% in the ITO waste target material powder is less than 74 μm.

[0019] Preferably, the particle size of the reducing agent is less than 0.15 mm.

[0020] Preferably, the particle size of the adhesive is less than 0.15 mm.

[0021] As a preferred technical solution of the present invention, the reducing agent includes: one or a combination of at least two of coke powder, graphite powder or activated carbon powder.

[0022] Preferably, the adhesive comprises: one or a combination of at least two of starch, bentonite, methyl cellulose, flour or blackstrap molasses.

[0023] As a preferred technical solution of the present invention, the total volume of the pores in the molded body is 8-32% of the volume of the molded body.

[0024] As a preferred technical solution of the present invention, the diameter of the pores in the molded body is 8-15 mm.

[0025] Preferably, the center distance between adjacent holes in the molded body is 20-30 mm.

[0026] As a preferred technical solution of the present invention, the reduction temperature is 1000-1200°C.

[0027] Preferably, the reducing gas used in the reduction comprises: carbon monoxide and / or hydrogen.

[0028] Preferably, the reduction time is 4-6 hours.

[0029] As a preferred technical solution of the present invention, the discharge temperature of the reduction is 150-230°C.

[0030] As a preferred technical solution of the present invention, the temperature of the vacuum distillation is 900-1200°C.

[0031] Preferably, the absolute vacuum degree of the vacuum distillation is 5-50 Pa.

[0032] As a preferred technical solution of the present invention, the vacuum distillation time is 3-5 hours.

[0033] Compared with the existing technical solutions, the present invention has the following beneficial effects:

[0034] (1) The recycling method provided by the present invention avoids the blockage of gas caused by conventional bulk material spraying by forming a porous structure molded body, realizes the continuity and stabilization of the production line, improves the reduction efficiency and recovery rate of low-grade ITO (containing 40-80% indium), and reduces equipment wear and dust explosion risks.

[0035] (2) The recovery method provided by the present invention can produce an indium product with a purity of ≥99.995% after vacuum distillation, and the recovery rate of indium is greater than 99%. The purity of the tin product is ≥99.5%, and the recovery rate of tin is greater than 95%.

[0036] The present invention is further described in detail below. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims. DETAILED DESCRIPTION

[0037] To better illustrate the present invention and facilitate understanding of the technical solutions of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0038] Currently, when recycling ITO waste targets, they are usually crushed into powder and then reduced to obtain elemental indium and elemental tin or indium-tin alloy to achieve the recovery of valuable metals. However, when reducing during the recovery process, it is usually carried out continuously in a reduction furnace. During the process, due to the intense local reaction, powder splashing occurs, which is not conducive to the stable reduction, resulting in poor recovery of indium and tin. Based on this, the present invention provides a method for recovering valuable metals in ITO waste targets. By shaping the mixed material into a specific porous shaped body, the material splashing is avoided while significantly improving the recovery of indium and tin. The details are as follows:

[0039] 1. This embodiment provides a method for recovering valuable metals from waste ITO targets, the method comprising:

[0040] Mixing ITO waste target powder, a reducing agent, a solvent and an adhesive to obtain a mixture;

[0041] The mixture is formed, and then reduced and vacuum distilled in sequence to obtain indium products and tin products.

[0042] In the present invention, the mass percentage of indium in the ITO waste target material powder is 40-80%.

[0043] In the present invention, the mixing methods include: stirring mixing, V-type mixing and the like.

[0044] In the present invention, the reduction method includes: reduction using a continuous reduction furnace or other commonly used reduction methods in the art.

[0045] Among them, the mass ratio of the reducing agent to the ITO waste target powder is (0.2-4):1, for example, it can be 0.2:1, 0.4:1, 0.6:1, 0.8:1, 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8:1, 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1 or 4:1, etc., but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0046] Among them, the mass ratio of the ITO waste target powder and the solvent is 1:(0.1-0.4), for example, it can be 1:0.1, 1:0.12, 1:0.14, 1:0.16, 1:0.18, 1:0.2, 1:0.22, 1:0.24, 1:0.26, 1:0.28, 1:0.3, 1:0.32, 1:0.34, 1:0.36, 1:0.38 or 1:0.4, etc., but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0047] Among them, the mass ratio of the ITO waste target powder and the adhesive is 1:(0.02-0.1), for example, it can be 1:0.02, 1:0.03, 1:0.04, 1:0.05, 1:0.06, 1:0.07, 1:0.08, 1:0.09 or 1:0.1, etc., but is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0048] Among them, the particle size of particles with a mass percentage of >80% in the ITO waste target powder is <74μm, and the mass content can be, for example, 81%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98% or 100%, etc., but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0049] In the present invention, the definition of particle size refers to the aggregates of any particle size within the defined range or the aggregates of all particles of a particle size within a subset within the defined range.

[0050] Wherein, the particle size of the reducing agent is less than 0.15 mm.

[0051] Wherein, the particle size of the adhesive is less than 0.15 mm.

[0052] Wherein, the reducing agent includes: one or a combination of at least two of coke powder, graphite powder or activated carbon powder.

[0053] Exemplarily, the combination of reducing agents may be selected from: a combination of coke powder and graphite powder, a combination of graphite powder and activated carbon powder, a combination of coke powder and activated carbon powder, a combination of coke powder, graphite powder and activated carbon powder, and the like.

[0054] Wherein, the adhesive comprises: one or a combination of at least two of starch, bentonite, methyl cellulose, flour or blackstrap molasses.

[0055] In the present invention, solvent refers to a liquid that ensures that the adhesive binds the powders during the powder mixing process, such as water or ethanol, a commonly used solvent in the art.

[0056] Wherein, the formed body obtained by the forming is a porous formed body.

[0057] In the present invention, the methods of forming into porous molded bodies include: press molding, etc. The molding methods in this field that can make the molded body produce pores, such as molding into porous structures such as honeycomb bodies, can be reasonably designed according to actual needs.

[0058] The total volume of the pores in the molded body is 8-32% of the volume of the molded body, for example, it can be 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30% or 32%, etc., but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0059] The diameter of the pores in the molded body is 8-15 mm, for example, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm or 15 mm, but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0060] Among them, the center distance between adjacent holes in the molded body is 20-30 mm, for example, it can be 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm or 30 mm, etc., but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0061] The reduction temperature is 1000-1200°C, for example, it can be 1000°C, 1020°C, 1040°C, 1060°C, 1080°C, 1100°C, 1120°C, 1140°C, 1160°C, 1180°C or 1200°C, but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0062] Wherein, the reducing gas used in the reduction includes: carbon monoxide and / or hydrogen.

[0063] The reduction time is 4-6 hours, for example, 4 hours, 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours, 5 hours, 5.2 hours, 5.4 hours, 5.6 hours, 5.8 hours or 6 hours, but is not limited to the listed values. Other values ​​not listed within the range also meet the requirements.

[0064] The reduction discharge temperature is 150-230°C, for example, 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, 180°C, 185°C, 190°C, 195°C, 200°C, 205°C, 210°C, 215°C, 220°C, 225°C or 230°C, etc., but is not limited to the listed values, and other values ​​not listed within this range also meet the requirements.

[0065] Wherein, the temperature of the vacuum distillation is 900-1200°C, for example, it can be 900°C, 920°C, 940°C, 960°C, 980°C, 1000°C, 1020°C, 1040°C, 1060°C, 1080°C, 1100°C, 1120°C, 1140°C, 1160°C, 1180°C or 1200°C, etc., but is not limited to the listed values, and other unlisted values ​​within this range also meet the requirements.

[0066] The absolute vacuum degree of the vacuum distillation is 5-50 Pa, for example, it can be 5 Pa, 10 Pa, 15 Pa, 20 Pa, 25 Pa, 30 Pa, 35 Pa, 40 Pa, 45 Pa or 50 Pa, etc., but is not limited to the listed values. Other values ​​not listed within this range also meet the requirements.

[0067] The vacuum distillation time is 3-5 hours, for example, 3 hours, 3.2 hours, 3.4 hours, 3.6 hours, 3.8 hours, 4 hours, 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours or 5 hours, but is not limited to the listed values. Other values ​​not listed within the range also meet the requirements.

[0068] Furthermore, in order to illustrate the recycling effect that can be achieved by the recycling method provided by the present invention for ITO waste targets, the following actual examples are used for illustration, as follows:

[0069] Example 1

[0070] This embodiment provides a method for recovering valuable metals from waste ITO targets, which is as follows:

[0071] Mixing ITO waste target powder (containing 40% by mass of indium), a reducing agent, water and a binder to obtain a mixture;

[0072] The mixture is formed, and then reduced and vacuum distilled in sequence to obtain indium products and tin products;

[0073] The mass ratio of the reducing agent to the ITO waste target material powder is 0.2:1; the mass ratio of the ITO waste target material powder to the solvent is 1:0.2; the mass ratio of the ITO waste target material powder to the adhesive is 1:0.05; 85% by mass of the particles in the ITO waste target material powder have a particle size of less than 74 μm; the particle size of the reducing agent is less than 0.15 mm; the particle size of the adhesive is less than 0.15 mm; the reducing agent is coke powder; and the adhesive is starch;

[0074] The molded body obtained by the molding is a porous molded body; the total volume of the pores in the molded body is 9% of the volume of the molded body, the diameter of the pores is 8 mm, and the center distance between adjacent pores is 20 mm;

[0075] The reduction temperature is 1100°C, the reducing gas used is carbon monoxide, the time is 5.5h, and the reduction discharge temperature is 180°C;

[0076] The vacuum distillation temperature is 1000° C., the absolute vacuum degree is 20 Pa, and the time is 4 hours.

[0077] Example 2

[0078] This embodiment provides a method for recovering valuable metals from waste ITO targets, which is as follows:

[0079] Mixing ITO waste target powder (with an indium content of 80% by mass), a reducing agent, water and a binder to obtain a mixture;

[0080] The mixture is formed, and then reduced and vacuum distilled in sequence to obtain indium products and tin products;

[0081] The mass ratio of the reducing agent to the ITO waste target material powder is 4:1; the mass ratio of the ITO waste target material powder to the solvent is 1:0.3; the mass ratio of the ITO waste target material powder to the adhesive is 1:0.08; 90% by mass of the particles in the ITO waste target material powder have a particle size of less than 74 μm; the particle size of the reducing agent is less than 0.15 mm; the particle size of the adhesive is less than 0.15 mm; the reducing agent is graphite powder; and the adhesive is carboxymethyl cellulose;

[0082] The molded body obtained by the molding is a porous molded body; the total volume of the pores in the molded body is 31% of the volume of the molded body, the diameter of the pores is 15 mm, and the center distance between adjacent pores is 30 mm;

[0083] The reduction temperature is 1150°C, the reducing gas used is carbon monoxide, the time is 5 hours, and the reduction discharge temperature is 200°C;

[0084] The vacuum distillation temperature is 1100° C., the absolute vacuum degree is 35 Pa, and the time is 3.5 h.

[0085] Example 3

[0086] This embodiment provides a method for recovering valuable metals from waste ITO targets, which is as follows:

[0087] Mixing ITO waste target powder (containing 50% by mass of indium), a reducing agent, water and a binder to obtain a mixture;

[0088] The mixture is formed, and then reduced and vacuum distilled in sequence to obtain indium products and tin products;

[0089] The mass ratio of the reducing agent to the ITO waste target material powder is 1:1; the mass ratio of the ITO waste target material powder to the solvent is 1:0.1; the mass ratio of the ITO waste target material powder to the adhesive is 1:0.1; 82% by mass of the particles in the ITO waste target material powder have a particle size of less than 74 μm; the particle size of the reducing agent is less than 0.15 mm; the particle size of the adhesive is less than 0.15 mm; the reducing agent is coke powder; and the adhesive is starch;

[0090] The molded body obtained by the molding is a porous molded body; the total volume of the pores in the molded body is 14% of the volume of the molded body, the diameter of the pores is 10 mm, and the center distance between adjacent pores is 25 mm;

[0091] The reduction temperature is 1000°C, the reducing gas used is carbon monoxide, the time is 6 hours, and the reduction discharge temperature is 150°C;

[0092] The vacuum distillation temperature is 900° C., the absolute vacuum degree is 5 Pa, and the time is 5 h.

[0093] Example 4

[0094] This embodiment provides a method for recovering valuable metals from waste ITO targets, which is as follows:

[0095] Mixing ITO waste target powder (with an indium content of 60% by mass), a reducing agent, water and a binder to obtain a mixture;

[0096] The mixture is formed, and then reduced and vacuum distilled in sequence to obtain indium products and tin products;

[0097] The mass ratio of the reducing agent to the ITO waste target material powder is 3:1; the mass ratio of the ITO waste target material powder to the solvent is 1:0.4; the mass ratio of the ITO waste target material powder to the adhesive is 1:0.02; 95% by mass of the particles in the ITO waste target material powder have a particle size of less than 74 μm; the particle size of the reducing agent is less than 0.15 mm; the particle size of the adhesive is less than 0.15 mm; the reducing agent is activated carbon powder; and the adhesive is starch;

[0098] The molded body obtained by the molding is a porous molded body; the total volume of the pores in the molded body is 20% of the volume of the molded body, the diameter of the pores is 12 mm, and the center distance between adjacent pores is 28 mm;

[0099] The reduction temperature is 1200°C, the reducing gas used is carbon monoxide, the time is 4 hours, and the reduction discharge temperature is 230°C;

[0100] The vacuum distillation temperature is 1200° C., the absolute vacuum degree is 50 Pa, and the time is 3 hours.

[0101] Example 5

[0102] The only difference from Example 1 is that the reducing agent used is replaced by an equal amount of aluminum powder with equal particle size distribution.

[0103] Example 6

[0104] The only difference from Example 1 is that the pore volume of the shaped body is 5% of the volume of the shaped body.

[0105] Comparative Example 1

[0106] The only difference from Example 1 is that the molded body obtained by molding is a solid molded body, that is, it does not contain pores.

[0107] Comparative Example 2

[0108] The only difference from Example 1 is that the mixture is directly reduced without molding after mixing.

[0109] Comparative Example 3

[0110] The only difference from Example 1 is that no reducing atmosphere of carbon monoxide is provided during the reduction.

[0111] The above embodiment enables the recovery indexes of indium products and tin products to be shown in Table 1 below.

[0112] Table 1

[0113]

[0114] The recovery method provided by the present invention is through the following reaction:

[0115] C+O→CO

[0116] SnO+CO→Sn+CO2

[0117] SnO2+2CO→Sn+2CO2

[0118] In2O3+3CO→2In+3CO2

[0119] In the obtained indium tin alloy, the difference in vapor pressure between In and Sn is amplified under high temperature vacuum conditions. The boiling point of indium in a vacuum environment is 900-1100°C, while the boiling point of tin is still higher than 1400°C. The difference in boiling points is used to purify the refined indium.

[0120] As shown in Table 1, in Comparative Example 1 (solid molded body), due to the lack of pore structure, the contact interface between ITO powder and reducing agent and the gas-solid channel are severely limited, and the generated metal vapor and slag cannot escape in time, resulting in local accumulation passivation and uneven heat distribution, and the recovery efficiency and purity are greatly reduced; Comparative Example 2 (unformed loose bed) is difficult to form a stable airflow channel due to the loose powder and uneven distribution of reducing agent; Comparative Example 3 (no CO atmosphere) relies entirely on the solid phase self-generated reducing gas, lacks a continuous external driving force, and the reaction The equilibrium is difficult to fully shift to the metal side, resulting in incomplete reduction; Example 5 (using only Al powder instead of carbon powder) has a strong exothermic reaction and high reducing ability, but the reaction is too violent, the temperature distribution is uneven, and the generated Al2O3 slag is easily mixed with the metal, which increases the difficulty of slag-gold separation, and there is a lack of atmosphere-coupled distillation pull; Example 6 (pore volume is only 5%) has too low porosity to construct a continuous and efficient gas-solid reaction and vapor migration channel. Despite the presence of CO atmosphere, it is still impossible to achieve the ideal high recovery rate and high purity.

[0121] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0122] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0123] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for recovering valuable metals from waste ITO targets, characterized in that: The recovery method comprises: Mixing ITO waste target powder, a reducing agent, a solvent and an adhesive to obtain a mixture; The mixture is formed, and then reduced and vacuum distilled in sequence to obtain indium products and tin products; Wherein, the formed body obtained by the forming is a porous formed body.

2. The recycling method according to claim 1, wherein The mass ratio of the reducing agent to the ITO waste target powder is (0.2-4):1; Preferably, the mass ratio of the ITO waste target powder to the solvent is 1:(0.1-0.4); Preferably, the mass ratio of the ITO waste target powder to the adhesive is 1:(0.02-0.1).

3. The recovery method according to claim 1 or 2, wherein: The particle size of particles with a mass percentage of more than 80% in the ITO waste target powder is less than 74 μm; Preferably, the particle size of the reducing agent is less than 0.15 mm; Preferably, the particle size of the adhesive is less than 0.15 mm.

4. The recycling method according to any one of claims 1 to 3, wherein: The reducing agent includes: one or a combination of at least two of coke powder, graphite powder or activated carbon powder; Preferably, the adhesive comprises: one or a combination of at least two of starch, bentonite, methyl cellulose, flour or blackstrap molasses.

5. The recycling method according to any one of claims 1 to 4, wherein: The total volume of the pores in the shaped body is 8-32% of the volume of the shaped body.

6. The recycling method according to any one of claims 1 to 5, characterized in that: The diameter of the pores in the molded body is 8-15 mm; Preferably, the center distance between adjacent holes in the molded body is 20-30 mm.

7. The recycling method according to any one of claims 1 to 6, wherein: The reduction temperature is 1000-1200°C; Preferably, the reducing gas used in the reduction comprises: carbon monoxide and / or hydrogen; Preferably, the reduction time is 4-6 hours.

8. The recycling method according to any one of claims 1 to 7, wherein: The discharge temperature of the reduction is 150-230°C.

9. The recycling method according to any one of claims 1 to 8, wherein: The temperature of the vacuum distillation is 900-1200°C; Preferably, the absolute vacuum degree of the vacuum distillation is 5-50 Pa.

10. The recycling method according to any one of claims 1 to 9, characterized in that: The vacuum distillation time is 3-5h.

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