Method and equipment for recovering precious metal from waste ceramic

Abstract

The invention belongs to the technical field of precious metal wet recovery, and particularly relates to a method and equipment for recovering precious metal in waste ceramic. The specific method comprises the following steps: waste ceramic crushing, ball milling, size mixing and grading, solid-liquid separation, organic matter pyrolysis, acid leaching reduction and acid leaching tailing washing. Preliminary dissociation of valuable noble metal materials in waste ceramics and a large amount of ceramic powder is achieved by adding ball milling to the crusher, and preliminary separation of the valuable noble metals and the ceramic powder is achieved by using the shaking table, namely enrichment of the valuable noble metals; organic substances in ceramic powder with precious metal are removed under the action of the high-temperature pyrolyzing furnace to complete exposure of the precious metal material, and then separation of the valuable precious metal and the ceramic powder is thoroughly achieved through acid leaching of the acid leaching kettle; according to the method, resource recycling of the ceramic powder is achieved while valuable precious metal in the waste ceramic is recycled, and the method has a large market application prospect.

Description

Technical Field

[0001] This invention belongs to the field of wet precious metal recycling technology, and specifically relates to a method and equipment for recycling precious metals from waste ceramics. Background Technology

[0002] Precious metals (such as gold, silver, platinum, palladium, etc.) are often used as "refining agents" in ceramics. They are applied to ceramic materials in the form of powders, slurries, or salts as key additives or coatings to impart special properties. Their applications mainly include the following areas: Electronic ceramics field: Multilayer ceramic capacitors (MLCCs): As a key component in modern electronic devices (such as mobile phones, computers, and automobiles), MLCCs widely use precious metal pastes such as palladium and silver for their internal electrodes. Through printing, lamination, and co-firing processes, thousands of miniature capacitors are formed on a ceramic dielectric.

[0003] Piezoelectric ceramics: used in devices such as sensors, transducers, and filters. Their electrodes are usually made of silver or silver-palladium alloy paste to ensure excellent conductivity and co-firing compatibility.

[0004] Thick film circuits: circuits are formed by printing precious metal pastes such as gold, palladium-silver on ceramic substrates. They are widely used in hybrid integrated circuits, automotive electronics and other fields.

[0005] Structural ceramics and high-temperature resistant coatings: In aerospace and other fields, precious metals such as platinum are used as coatings or additives for ultra-high temperature ceramic components to improve their oxidation and corrosion resistance in extreme environments.

[0006] Composite materials: By combining precious metal fibers or particles with a ceramic matrix, new materials that combine the toughness and conductivity of metals with the hardness and high-temperature resistance of ceramics can be prepared, making them suitable for special fields such as aerospace and military.

[0007] Catalysis field: Precious metals (such as platinum and palladium) can be used as highly efficient catalysts, supported on porous ceramic (such as alumina) supports, to prepare three-way catalytic converters for automobile exhaust purification, as well as various petrochemical catalysts.

[0008] Arts and crafts ceramics field: Gold-decorated ceramics: Represented by German Meissen porcelain and Qing Dynasty imperial porcelain in China, these ceramics often employ gilding / plating techniques, mixing gold powder with resin or oil to create gold paint, which is then applied to the surface of the fired porcelain.

[0009] Gold Water / Bright Gold: A pre-prepared gold resin acid salt solution that can be directly applied. The process is simple and the cost is low. It is widely used for edging, outlining and other decorations on daily-use porcelain and decorative porcelain.

[0010] Currently, there is a lack of efficient industrial recycling technologies for the aforementioned ceramic products containing precious metals after they reach the end of their service life. To increase the industrial value of waste ceramics containing precious metals, it is necessary to develop corresponding methods and specialized equipment for recycling precious metals from waste ceramics. Summary of the Invention

[0011] To overcome the above problems, the present invention provides a method and equipment for recovering precious metals from waste ceramics, which can simultaneously recover valuable precious metals from waste ceramics and regenerate ceramic powder. The regenerated ceramic powder can be used as a basic material for the ceramic industry.

[0012] A method for recovering precious metals from waste ceramics includes the following: Step 1: Crush the waste ceramics to obtain coarse-grained ceramic fragments; Step 2: Grind the coarse-grained crushed porcelain material into a particle size of no more than 200 mesh to obtain porcelain powder slurry; Step 3: Adjust the mass fraction of the ceramic powder slurry to not less than 15% and not more than 30%, and then perform gravity separation using a shaking table; Step 4: The refined material and tailings after gravity separation are subjected to solid-liquid separation, and the filtrate is returned to Step 2 for ball milling. Step 5: Pyrolyze the solid concentrate after solid-liquid separation to obtain magnetic powder concentrate; Step 6: The pyrolyzed magnetic powder concentrate is subjected to acid leaching to obtain acid leaching slurry; Step 7: The acid leaching slurry is filtered to obtain acid leaching precious metal solution and ceramic powder, wherein the acid leaching precious metal solution is used to reduce and recover precious metals; Step 8: Collect the leachated ceramic powder together with the tailings from the gravity separation on the shaking table for later use.

[0013] In step four, the concentrate and tailings after gravity separation on the shaking table are buffered, and then the concentrate and tailings are separated into solid and liquid components.

[0014] A precious metal recovery device for waste ceramics, comprising the following components arranged in sequence according to the process: Crushing and grinding unit; The sorting and enrichment unit has its feed end connected to the discharge end of the crushing and grinding unit. The pyrolysis unit has its feed end connected to the concentrate outlet of the sorting and enrichment unit; The hydrometallurgical extraction unit has its feed end connected to the discharge end of the pyrolysis unit.

[0015] The crushing and grinding unit includes a multi-stage crusher, a buffer silo, a screw conveyor, and a ball mill connected in sequence; wherein, the feed end of the multi-stage crusher is used to receive waste ceramics, and the discharge end of the ball mill is connected to the feed end of the sorting and enrichment unit.

[0016] The multi-stage pulverizer includes: Vibrating feeder; A hammer crusher is located below the discharge port of the vibrating feeder; A receiving hopper is located below the discharge port of the hammer crusher; A double-roll crusher is located below the discharge port of the receiving hopper; The screw feeder has its feed end located below the roller crusher.

[0017] The sorting and enrichment unit includes a concentration adjustment tank, a shaking table, a concentrate buffer tank, a tailings buffer tank, a concentrate filter, and a tailings filter. The feed end of the concentration adjustment tank is connected to the discharge end of the ball mill, and its discharge end is connected to the feed end of the shaking table via a first conveying pump. The concentrate outlet and tailings outlet of the shaking table are respectively connected to the feed ends of the concentrate buffer tank and the tailings buffer tank. The discharge ends of the concentrate buffer tank and the tailings buffer tank are respectively connected to the feed ends of the concentrate filter and the tailings filter via a second conveying pump and a third conveying pump. The solid discharge end of the concentrate filter is connected to the pyrolysis unit.

[0018] The outlets of both the fine material filter and the tail material filter are connected to the water inlet of the ball mill to form a liquid flow loop.

[0019] The pyrolysis unit is a pyrolysis furnace, and its feed end is connected to the solid discharge end of the fine material filter.

[0020] The hydrometallurgical extraction unit includes an acid leaching kettle, a reagent kettle, and an acid leaching filter; wherein the feed end of the acid leaching kettle is connected to the discharge end of the pyrolysis unit; the liquid outlet of the reagent kettle is connected to the inlet of the acid leaching kettle through a fourth pump; and the discharge end of the acid leaching kettle is connected to the feed end of the acid leaching filter through a fifth pump.

[0021] Beneficial effects of this invention: This invention achieves the initial separation of valuable precious metals from a large amount of ceramic powder in waste ceramics through a crusher and ball mill. The use of a shaking table achieves the initial separation of valuable precious metals from ceramic powder, i.e., the enrichment of valuable precious metals. After enrichment, the ceramic powder containing precious metals undergoes organic matter removal in a high-temperature pyrolysis furnace, thus exposing the precious metals. Finally, acid leaching in an acid leaching kettle completely separates the valuable precious metals from the ceramic powder.

[0022] This invention achieves resource recovery of ceramic powder while recovering valuable precious metals from waste ceramics. The comprehensive recycling process thoroughly separates precious metal materials from ceramic powder, and has great market application prospects. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the crushing and grinding unit structure of the present invention; Figure 3 This is a schematic diagram of the first part of the sorting and enrichment unit of the present invention; Figure 4 This is a schematic diagram of the second part of the sorting and enrichment unit of the present invention; Figure 5 This is a schematic diagram of the third part of the sorting and enrichment unit of the present invention; Figure 6 This is a schematic diagram of the hydrometallurgical extraction unit structure of the present invention; Figure 7 This is a schematic diagram of the structure of the ceramic pulverizer of the present invention.

[0025] Wherein: 1—Acid leaching filter; 2—Multi-stage pulverizer; 3—Buffer silo; 4—Screw conveyor; 5—Ball mill; 6—Concentration adjustment tank; 7—Shaking table; 8—Fine material buffer tank; 9—Tail material buffer tank; 10—Fine material filter; 11—Tail material filter; 12—Pyrolysis furnace; 13—Acid leaching kettle; 14—Reagent kettle; 151—First transfer pump; 152—Second transfer pump; 153—Third transfer pump; 154—Fourth transfer pump; 155—Fifth transfer pump; 21—Machine casing; 22—Vibrating feeder; 23—Hammer crusher; 24—Collection hopper; 25—Double roller crusher; 26—Screw discharger. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0027] Example 1: Please see Figures 1-7 As shown, the purpose of this invention is to recover valuable precious metals from waste ceramics while simultaneously regenerating ceramic powder as a basic material for the ceramic industry. The specific method is as follows: Step 1, crushing: Place the larger-sized waste ceramics into the multi-stage crusher 2 for preliminary crushing to obtain coarse ceramic fragments with a particle size of 1-10mm; Step 2, ball milling: Place the coarse-particle crushed porcelain material in ball mill 5 and ball mill it until the particle size is no larger than 200 mesh to obtain porcelain powder slurry; Step 3, Slurry preparation and classification: The porcelain powder slurry is discharged into the concentration adjustment tank 6 and its mass fraction is adjusted to 15%-30%. Since the density of precious metals in the porcelain powder slurry is 10.5-22.56 g / m³ and the density of ceramic powder is 2-4 g / m³, the gravity difference between the two is large. Therefore, gravity separation is carried out by shaking table 7. Step 4, solid-liquid separation: The concentrate and tailings after gravity separation are separated into solid and liquid by a filter press. The filtrate obtained after solid-liquid separation of the concentrate and tailings is returned to ball mill 5. Step 5, pyrolysis: After solid-liquid separation, the concentrate obtained is a solid concentrate with a high precious metal content, which is sent to pyrolysis furnace 12 and pyrolyzed at 200-600 degrees Celsius to remove organic matter and obtain magnetic powder concentrate. Step 6, acid leaching: The pyrolyzed magnetic powder is fed into acid leaching kettle 13 and acid leaching is carried out in acid leaching kettle 13 to obtain acid leaching slurry; Step 7: The acid leaching slurry is filtered through acid leaching filter 1 to obtain acid leaching precious metal solution and ceramic powder, wherein the acid leaching precious metal solution is used to reduce and recover precious metals; Step 8, washing of acid leaching tailings: After the leached ceramic powder has undergone alkaline water washing to render it harmless, it is collected together with the tailings after gravity separation for later use.

[0028] In step two, water is added to the ball mill 5 before ball milling.

[0029] In step four, the refined material and tailings after gravity separation by the shaking table 7 are respectively fed into the refined material buffer tank 8 and the tailings buffer tank 9 for buffering. After being buffered in the refined material buffer tank 8 and the tailings buffer tank 9, the refined material and tailings are then separated into solid and liquid components by the refined material filter 10 and the tailings filter 11, respectively. The buffering time for the refined material and tailings in the refined material buffer tank 8 and the tailings buffer tank 9 is 0.5-1 hour, and the specific buffering time can be determined by those skilled in the art based on the processing volume and the size of the tanks.

[0030] In step six, acidic leaching agent is pre-pumped from reagent tank 14 into acid leaching tank 13 via fourth transfer pump 154.

[0031] A precious metal recovery device for waste ceramics, comprising the following components arranged in sequence according to the process: Feeding unit; The crushing and grinding unit has its feed end connected to the feeding unit; The sorting and enrichment unit has its feed end connected to the discharge end of the crushing and grinding unit. The pyrolysis unit has its feed end connected to the concentrate outlet of the sorting and enrichment unit; The hydrometallurgical extraction unit has its feed end connected to the discharge end of the pyrolysis unit.

[0032] The crushing and grinding unit includes a multi-stage crusher 2, a buffer silo 3, a screw conveyor 4, and a ball mill 5 connected in sequence; wherein, the feed end of the multi-stage crusher 2 is connected to the feeding unit and is used to receive the discharge of the feeding unit, and the discharge end of the ball mill 5 is connected to the feed end of the sorting and enrichment unit.

[0033] The multi-stage pulverizer 2 includes: Casing 21; A vibrating feeder 22 is mounted on the housing 21; Hammer crusher 23 is mounted on the casing 21 and located below the discharge port of the vibrating feeder 22; The receiving hopper 24 is located inside the casing 21 and below the discharge port of the hammer crusher 23; The roller crusher 25 is located inside the housing 21 and is positioned below the discharge port of the receiving hopper 24; The screw feeder 26 has its feed end inserted into the housing 21 to receive the discharge from the roller crusher 25.

[0034] The sorting and enrichment unit includes a concentration adjustment tank 6 and a shaking table 7; wherein the feed end of the concentration adjustment tank 6 is connected to the discharge end of the ball mill 5 and is used to receive the discharge of the ball mill 5, and its discharge end is connected to the feed end of the shaking table 7 through a first conveying pump 151; the shaking table 7 is provided with a fine material outlet and a tail material outlet.

[0035] The sorting and enrichment unit further includes a fine material buffer tank 8, a tailings buffer tank 9, a fine material filter 10, and a tailings filter 11; wherein the fine material outlet and tailings outlet of the shaking table 7 are respectively connected to the feed ends of the fine material buffer tank 8 and the tailings buffer tank 9; the discharge ends of the fine material buffer tank 8 and the tailings buffer tank 9 are respectively connected to the feed ends of the fine material filter 10 and the tailings filter 11 through a second conveying pump 152 and a third conveying pump 153; the solid discharge end of the fine material filter 10 is connected to the pyrolysis unit.

[0036] The liquid outlets of both the fine material filter 10 and the tail material filter 11 are connected to the water inlet of the ball mill 5 to form a liquid flow loop.

[0037] The pyrolysis unit is a pyrolysis furnace 12, whose feed end is connected to the solid discharge end of the fine material filter 10, and is used to receive the discharge of the fine material filter 10.

[0038] The hydrometallurgical extraction unit includes an acid leaching kettle 13, a reagent kettle 14, and an acid leaching filter 1; wherein the feed end of the acid leaching kettle 13 is connected to the discharge end of the pyrolysis unit and is used to receive the discharge of the pyrolysis unit; the liquid outlet end of the reagent kettle 14 is connected to the inlet of the acid leaching kettle 13 through a fourth transfer pump 154; the discharge end of the acid leaching kettle 13 is connected to the feed end of the acid leaching filter 1 through a fifth transfer pump 155; the acid leaching filter 1 is also provided with a liquid outlet and a fixed outlet.

[0039] The first transfer pump 151, the second transfer pump 152, the third transfer pump 153, the fourth transfer pump 154 ​​and the fifth transfer pump 155 are all corrosion-resistant and wear-resistant pumps.

[0040] Example 2: A precious metal recycling device for waste ceramics includes a multi-stage crusher 2, a buffer silo 3, a screw conveyor 4, a ball mill 5, a concentration adjustment tank 6, a shaking table 7, a fine material buffer tank 8, a tailings buffer tank 9, a fine material filter 10, a tailings filter 11, a pyrolysis furnace 12, an acid leaching kettle 13, a reagent kettle 14, an acid leaching filter 1, and a corrosion-resistant and wear-resistant pump. The multi-stage crusher 2 consists of an L-shaped casing 21, a vibrating feeder 22, a hammer crusher 23, a receiving hopper 24, a double-roll crusher 25, and a screw discharger 26. The vibrating feeder 22 is installed at the top of the casing 21, the screw discharger 26 is installed at the lower end of the casing 21, the double-roll crusher 25 is installed above the screw discharger 26, the receiving hopper 24 is installed above the double-roll crusher 25, and the hammer crusher 23 is installed above the receiving hopper 24 and corresponds to the discharge port of the vibrating feeder 22.

[0041] In summary, the outlet of the screw conveyor 26 of the multi-stage crusher 2 is connected to the feed end of the buffer silo 3 via a pipeline. The feed end of the screw conveyor 4 is connected to the discharge end of the buffer silo 3 to receive the discharge from the buffer silo 3. The discharge end of the screw conveyor 4 is connected to the feed end of the ball mill 5. The discharge end of the ball mill 5 is connected to the feed end of the concentration adjustment tank 6. The discharge end of the concentration adjustment tank 6 is connected to the shaking table 7 via the first conveying pump 151. The discharge end of the shaking table 7 is connected to the fine material buffer tank 8 and the tail material buffer tank 9 respectively. The discharge from the fine material buffer tank 8 and the tail material buffer tank 9... The feed ends of the filter 10 and the tailing filter 11 are connected to the feed ends of the filter 10 and the tailing filter 11 respectively through the second conveying pump 152 and the third conveying pump 153. The liquid outlets of the filter 10 and the tailing filter 11 are connected to the water supply end of the ball mill 5 through pipelines. The solid discharge end of the filter 10 is connected to the process of the pyrolysis furnace 12. The discharge end of the pyrolysis furnace 12 is connected to the process of the acid leaching kettle 13. The liquid outlet of the reagent kettle 14 is connected to the acid leaching kettle 13 through the fourth conveying pump 154. The discharge end of the acid leaching kettle 13 is connected to the feed end of the acid leaching filter 1 through the fifth conveying pump 155.

[0042] The working process of this invention is as follows: A feeding robot is connected to the vibrating feeder 22 of the multi-stage crusher 2. The feeding robot picks up waste ceramics and feeds them into the vibrating feeder 22 of the multi-stage crusher 2. The vibrating feeder 22 vibrates, continuously supplying waste ceramics to the hammer crusher 23. Under the action of the hammer crusher 23, the waste ceramics are crushed into larger ceramic powder. The crushed ceramic powder is collected through the receiving hopper 24 and falls into the roller crusher 25 for further pulverization into smaller ceramic particles. The ceramic particles crushed by the roller crusher 25 fall into the screw conveyor 26 and are continuously conveyed to the buffer. In silo 3, a ball mill 5 pre-filled with a measured amount of water is started. Smaller ceramic particles in silo 3 are quantitatively added to the ball mill 5 by a screw conveyor 4. Under the grinding action of the ball mill 5, the smaller ceramic particles are transformed into a fine slurry of 200 mesh or finer particles. The slurry ground by the ball mill 5 is then conveyed to a concentration adjustment tank 6. The slurry concentration is adjusted in the concentration adjustment tank 6. Once the required concentration is reached, the slurry is fed to a shaking table 7 via a first conveying pump 151. The shaking table 7 is started, and under the action of gravity separation, the ceramic slurry with a higher specific gravity and containing precious metal materials, i.e., the refined material, enters the refined material buffer tank 8, while the ceramic slurry with a lower specific gravity, i.e., the tail material, enters the tail material buffer tank 8. The ceramic slurry containing precious metal materials in the feed buffer tank 9 and the refined feed buffer tank 8, and the ceramic slurry in the tailings buffer tank 9 are fed into the refined feed filter 10 and the tailings filter 11 respectively under the action of the second conveying pump 152 and the third conveying pump 153 for solid-liquid separation. The separated process water is returned to the ball mill 5. The ceramic powder containing precious metal materials discharged from the refined feed filter 10 is sent to the pyrolysis furnace 12 for high-temperature pyrolysis to remove organic materials, achieving complete exposure of the precious metal materials. The ceramic powder discharged from the tailings filter 11 is sent to the ceramic preparation plant for use as a base material. The material that has completed pyrolysis in the pyrolysis furnace 12 is sent to the acid leaching kettle 13. The agent vessel 14 adds a specified amount of acid leaching solution to the acid leaching vessel 13 through the fourth transfer pump 154. The pyrolyzed material reacts in the acid leaching vessel 13 to dissolve the precious metal material and fully dissociate the precious metal material from the ceramic powder. After acid leaching, the acid leaching slurry is sent to the acid leaching filter 1 by the fifth transfer pump 155. The acid leaching filter 1 filters the precious metal leaching solution and the ceramic powder to achieve the final separation. The ceramic powder obtained after filtration is further neutralized in alkaline water in the acid leaching filter 1 and then sent to the ceramic manufacturing plant as a base material. The acid leaching solution obtained after filtration enters the next process for reduction and purification to prepare metal materials.

[0043] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the scope of protection of the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, any person skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention within the scope of the technology disclosed in the present invention. These simple modifications are all within the scope of protection of the present invention.

[0044] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0045] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for recovering precious metals from waste ceramics, characterized in that, Includes the following: Step 1: Crush the waste ceramics to obtain coarse-grained ceramic fragments; Step 2: Grind the coarse-grained crushed porcelain material into a particle size of no more than 200 mesh to obtain porcelain powder slurry; Step 3: Adjust the mass fraction of the ceramic powder slurry to not less than 15% and not more than 30%, and then perform gravity separation using a shaking table; Step 4: The refined material and tailings after gravity separation are subjected to solid-liquid separation, and the filtrate is returned to Step 2 for ball milling. Step 5: Pyrolyze the solid concentrate after solid-liquid separation to obtain magnetic powder concentrate; Step 6: The pyrolyzed magnetic powder concentrate is leached with acid to obtain acid leaching slurry; Step 7: The acid leaching slurry is filtered to obtain acid leaching precious metal solution and ceramic powder, wherein the acid leaching precious metal solution is used to reduce and recover precious metals; Step 8: Collect the leachated ceramic powder together with the tailings from the gravity separation on the shaking table for later use.

2. The method for recovering precious metals from waste ceramics according to claim 1, characterized in that, In step four, the concentrate and tailings after gravity separation on the shaking table are buffered, and then the concentrate and tailings are separated into solid and liquid components.

3. A precious metal recovery device for waste ceramics applied to the precious metal recovery method described in any one of claims 1-2, characterized in that, Including those set up sequentially according to the process order: Crushing and grinding unit; The sorting and enrichment unit has its feed end connected to the discharge end of the crushing and grinding unit. The pyrolysis unit has its feed end connected to the concentrate outlet of the sorting and enrichment unit; The hydrometallurgical extraction unit has its feed end connected to the discharge end of the pyrolysis unit.

4. The precious metal recovery equipment from waste ceramics according to claim 3, characterized in that, The crushing and grinding unit includes a multi-stage crusher, a buffer silo, a screw conveyor, and a ball mill connected in sequence; wherein, the feed end of the multi-stage crusher is used to receive waste ceramics, and the discharge end of the ball mill is connected to the feed end of the sorting and enrichment unit.

5. The precious metal recovery equipment from waste ceramics according to claim 4, characterized in that, The multi-stage pulverizer includes: Vibrating feeder; A hammer crusher is located below the discharge port of the vibrating feeder; A receiving hopper is located below the discharge port of the hammer crusher; A double-roll crusher is located below the discharge port of the receiving hopper; The screw feeder has its feed end located below the roller crusher.

6. The precious metal recovery equipment from waste ceramics according to claim 4, characterized in that, The sorting and enrichment unit includes a concentration adjustment tank, a shaking table, a concentrate buffer tank, a tailings buffer tank, a concentrate filter, and a tailings filter. The feed end of the concentration adjustment tank is connected to the discharge end of the ball mill, and its discharge end is connected to the feed end of the shaking table via a first conveying pump. The concentrate outlet and tailings outlet of the shaking table are respectively connected to the feed ends of the concentrate buffer tank and the tailings buffer tank. The discharge ends of the concentrate buffer tank and the tailings buffer tank are respectively connected to the feed ends of the concentrate filter and the tailings filter via a second conveying pump and a third conveying pump. The solid discharge end of the concentrate filter is connected to the pyrolysis unit.

7. The precious metal recovery equipment from waste ceramics according to claim 6, characterized in that, The outlets of both the fine material filter and the tail material filter are connected to the water inlet of the ball mill to form a liquid flow loop.

8. The precious metal recovery equipment from waste ceramics according to claim 6, characterized in that, The pyrolysis unit is a pyrolysis furnace, and its feed end is connected to the solid discharge end of the fine material filter.

9. The precious metal recovery equipment from waste ceramics according to claim 3, characterized in that, The hydrometallurgical extraction unit includes an acid leaching kettle, a reagent kettle, and an acid leaching filter; wherein the feed end of the acid leaching kettle is connected to the discharge end of the pyrolysis unit; the liquid outlet of the reagent kettle is connected to the inlet of the acid leaching kettle through a fourth pump; and the discharge end of the acid leaching kettle is connected to the feed end of the acid leaching filter through a fifth pump.

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