SCR waste denitration catalyst vanadium tungsten synergistic extraction device

Abstract

The utility model discloses a kind of SCR waste denitration catalyst vanadium tungsten collaborative extraction devices, it includes base, reaction box, extraction cylinder, filter drum and separation assembly.Extraction cylinder is reciprocated by crank connecting rod mechanism, cooperate ratchet structure to drive filter drum to rotate slowly, realize microporous area rotation switching, improve leaching efficiency and reduce cleaning frequency.Separation assembly is formed by arc baffle and inclined baffle and filter drum cooperation to form mixing bin, enhance extraction effect.The device also includes scraper cleaning structure and spectrum analyzer detection function.The application can efficiently extract vanadium tungsten metal, reduce impurity interference, reduce secondary pollution risk, while having the characteristics of simple operation, easy to clean, suitable for low-grade waste catalyst recycling.

Description

Technical Field

[0001] This utility model relates to the field of resource utilization and environmental protection of waste catalysts, and in particular to a vanadium-tungsten co-extraction device for SCR waste denitrification catalysts. Background Technology

[0002] With increasingly stringent requirements for industrial production and environmental protection, selective catalytic reduction (SCR) denitrification technology is being widely applied in coal-fired power plants, steel mills, and the chemical industry. As the core component of this technology, SCR denitrification catalysts become waste during use due to decreased activity. These spent SCR catalysts typically contain 1%-5% vanadium pentoxide (V₂O₅) and 5%-10% tungsten trioxide (WO₃). These two metals are of significant recycling value due to their rarity and high economic value (V₂O₅ and WO₃ are both priced over 150,000 RMB / ton). However, traditional methods of treating spent catalysts (such as landfilling or simple stockpiling) not only waste valuable resources but also cause serious environmental pollution due to the heavy metal properties of vanadium. Furthermore, if vanadium and tungsten in spent catalysts are not effectively recovered, they may seep into soil and water bodies through rainwater runoff, leading to heavy metal pollution and harming the ecological environment and human health.

[0003] Currently, technologies for recovering valuable metals from spent SCR denitrification catalysts still have many shortcomings. For example, while traditional acid leaching can extract some metals, its selectivity is low, making it difficult to simultaneously and efficiently separate vanadium and tungsten. Furthermore, the open-loop operation process easily generates waste gas (such as SO2) and waste residue, causing secondary pollution. In addition, existing technologies often lack efficient synergistic extraction methods, making it impossible to prepare high-purity V₂O₅ (purity ≥99.2%) and WO₃ (purity ≥99.5%), limiting the reuse of recovered metals in high-end fields (such as sulfuric acid production, metallurgy, or vanadium redox flow batteries). Therefore, developing a synergistic extraction device capable of efficiently separating and recovering vanadium and tungsten has become an urgent technical challenge.

[0004] To address the aforementioned problems, this invention aims to provide a vanadium-tungsten co-extraction device for spent SCR denitrification catalysts. This device achieves selective separation and efficient recovery of vanadium and tungsten through physicochemical methods, while simultaneously reducing environmental pollution and resource waste. This device not only reduces the procurement cost of new catalysts (the cost of regenerated catalysts is only 20%-30% of that of new catalysts) but also promotes resource recycling and reduces dependence on primary mineral resources. Furthermore, through closed-loop operation and a waste gas treatment system (such as an alkaline scrubbing tower), this device can effectively control waste gas emissions (e.g., reducing SO2 concentration from 500 mg / m³). 3 Reduced to 20 mg / m 3 The following will be implemented to achieve the harmless treatment of leaching residue (such as solidification and landfill or utilization in building materials), thereby achieving the goal of clean production. Utility Model Content

[0005] The purpose of this utility model is to provide a vanadium-tungsten co-extraction device for SCR waste denitrification catalyst, which solves the problems mentioned in the background art.

[0006] This utility model is implemented as follows: a vanadium-tungsten co-extraction device for SCR waste denitrification catalyst includes a base, a reaction chamber is provided on one side of the top of the base, and further includes:

[0007] The extraction cylinder has an open top and bottom structure. A support plate is fixedly installed on the other side of the top of the base. A guide rail is fixed between the reaction chamber and the support plate at intervals. The extraction cylinder is located between the guide rails. The output end of the reaction chamber is a crank-connecting rod mechanism connected to the extraction cylinder. The reaction chamber is used to drive the extraction cylinder to reciprocate on the guide rails via the crank-connecting rod mechanism. An inclined guide plate is fixedly connected to the base, located at the bottom of the extraction cylinder. A separation assembly is also included; the separation assembly is located inside the extraction cylinder and includes a filter roller rotatably installed inside the extraction cylinder. The extraction cylinder has multiple uniformly arranged micropores on its filter drum. The separation component also includes two arc-shaped baffles and two inclined baffles. The two arc-shaped baffles are spaced apart along the axial direction of the filter drum and fixedly connected to the inner walls of both sides of the extraction cylinder. The two inclined baffles are spaced apart along the radial direction of the filter drum and fixedly connected to the inner walls of both sides of the extraction cylinder. The height of the arc-shaped baffles and the inclined baffles is greater than the height of the filter drum axis. The arc-shaped baffles and the inclined baffles are both matched with the surface of the filter drum. The arc-shaped baffles, the inclined baffles, the top surface of the filter drum, and the inner wall of the extraction cylinder form a mixing chamber.

[0008] Both sides of the extraction cylinder are equipped with main rollers that cooperate with two guide rails. The main rollers are equipped with ratchet structures with directional rotation functions. The main rollers and the filter cylinder are connected by a reducer fixedly set on the outer surface of the extraction cylinder.

[0009] Preferably, a secondary cylinder is fixedly connected to the side of the extraction cylinder away from the reaction chamber, and secondary rollers that cooperate with the guide rail are rotatably arranged on both sides of the secondary cylinder. The secondary cylinder, secondary rollers, main rollers and filter cylinder are all in the same plane.

[0010] Preferably, a rectangular opening is provided at the joint between the extraction cylinder and the sub-cylinder. A vertically arranged guide frame is fixedly connected inside the sub-cylinder, and a horizontally arranged column is slidably connected to the guide frame. A strip plate is fixedly connected to one end of the column facing the rectangular opening, and a scraper is provided on the strip plate. A double-end frame is connected to the other end of the column, and pins are fixedly connected to both ends of the double-end frame. Rotary wheels that are driven and connected to the sub-rollers are provided on both sides of the sub-cylinder. Elliptical grooves that cooperate with the pins are provided on the rotary wheels. When the extraction cylinder moves back and forth, the scraper at one end of the column moves back and forth through the cooperation of the rotary wheels and the pins, so that it contacts the surface of the filter drum.

[0011] Preferably, an elastic partition is fixedly connected to the column, and the elastic partition is sealed to the inner wall of the secondary cylinder. The elastic partition is located between the guide frame and the strip plate. The elastic partition isolates the internal space of the secondary cylinder into a closed chamber, and the double-end frame and the rotating wheel are both located in the closed chamber.

[0012] Preferably, channels are provided in both the strip plate and the cylinder. Multiple spray holes are provided on one side of the scraper on the strip plate. A liquid outlet pipe connected to the channel is fixedly connected to the double-end frame. A liquid inlet pipe is fixedly provided on the top of the secondary cylinder. A one-way valve is provided on both the liquid outlet pipe and the liquid inlet pipe. A dust cover is fixedly connected to the top of the liquid inlet pipe.

[0013] Preferably, a detection box is fixedly connected to the side of the extraction cylinder opposite to the rectangular opening, and a spectrometer is installed inside the detection box. A transparent window is fixedly installed at the joint between the detection box and the extraction cylinder. Electromagnetic clutches for driving the auxiliary roller and the rotating wheel are fixedly connected to both sides of the auxiliary cylinder.

[0014] Preferably, a discharge chamber door that can be closed or opened is provided on one side of the mixing chamber in the extraction cylinder.

[0015] The core driving mechanism of this device is the same as that of conventional extraction equipment, utilizing the reciprocating motion of the extraction cylinder to accelerate the full contact between the waste catalyst and the leachate. The unique feature lies in the use of the reciprocating motion of the extraction cylinder, combined with a conventional reducer and a ratchet structure on the main roller, to achieve slow rotation of the filter cylinder within the extraction cylinder. This slow rotation not only allows for the switching of micropore regions on the cylinder, but also, due to the filter cylinder's structural characteristics, enables the waste catalyst particles to undergo multiple leaching processes. Even if micropore blockage occurs, new micropore regions can be switched to handle the leaching process once the micropore regions on the filter cylinder can rotate and switch. This rotating leaching method not only reduces the frequency of cleaning the filter cylinder but also makes cleaning easier. In summary, this extraction device, through the coordination of simple mechanical structures, achieves high-efficiency leaching while also featuring low cleaning frequency and simplified cleaning. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the vanadium-tungsten co-extraction device for SCR waste denitrification catalyst provided in this embodiment of the utility model.

[0017] Figure 2 This is a schematic diagram showing the structure and arrangement of the separation components inside the extraction cylinder in an embodiment of this utility model;

[0018] Figure 3 This is a partial cross-sectional schematic diagram of the auxiliary cylinder and its internal transmission and cleaning structure in an embodiment of this utility model.

[0019] The attached diagram is labeled as follows: 1. Base; 2. Reaction chamber; 3. Extraction cylinder; 4. Support plate; 5. Guide rail frame; 6. Crank-connecting rod mechanism; 7. Guide plate; 8. Filter roller; 9. Arc-shaped baffle; 10. Inclined baffle; 11. Main roller; 12. Ratchet structure; 13. Reducer; 14. Secondary cylinder; 15. Secondary roller; 16. Rectangular opening; 17. Guide frame; 18. Column; 19. Strip plate; 20. Scraper; 21. Double-end frame; 22. Pin; 23. Rotary wheel; 24. Elliptical groove; 25. Elastic partition; 26. Channel; 27. Spray nozzle; 28. Liquid outlet pipe; 29. ​​Liquid inlet pipe; 30. One-way valve; 31. Dust cover; 32. Detection box; 33. Spectrometer; 34. Transparent window; 35. Electromagnetic clutch; 36. Discharge hopper door. Detailed Implementation

[0020] This utility model provides a vanadium-tungsten co-extraction device for SCR waste denitrification catalyst, the structure and function of which are described below. Figures 1 to 3 The device is shown in detail. It includes a base 1, a reaction chamber 2 on one side of the top of the base 1, and a support plate 4 fixedly mounted on the other side. A guide rail 5 is fixed between the reaction chamber 2 and the support plate 4, spaced apart, to support and guide the reciprocating movement of the extraction cylinder 3. The extraction cylinder 3, with an open top and bottom, is located between the guide rails 5 and moves via a main roller 11 that engages with the guide rails 5. A crank-connecting rod mechanism 6 is connected to the output end of the reaction chamber 2. This mechanism transmits power from the reaction chamber 2 to the extraction cylinder 3, causing it to reciprocate on the guide rails 5. An inclined guide plate 7 is located at the bottom of the extraction cylinder 3 to collect the liquid flowing from the extraction cylinder 3 and guide it to a subsequent processing system.

[0021] The extraction cylinder 3 houses a separation assembly, the core component of which is a filter roller 8. The filter roller 8 is rotatably mounted inside the extraction cylinder 3 via bearings and features multiple uniformly arranged micropores for separating liquid and solid particles. The separation assembly also includes two arc-shaped baffles 9 and two inclined baffles 10. The two arc-shaped baffles 9 are spaced apart axially along the filter roller 8 and fixedly connected to the inner walls of both sides of the extraction cylinder 3. The two inclined baffles 10 are spaced apart radially along the filter roller 8 and fixedly connected to the inner walls of both sides of the extraction cylinder 3. The heights of both the arc-shaped baffles 9 and the inclined baffles 10 are greater than the height of the filter roller 8's axis to ensure sufficient contact between the liquid and solid particles within the mixing chamber. The arc-shaped baffles 9, the inclined baffles 10, the top surface of the filter roller 8, and the inner wall of the extraction cylinder 3 together form the mixing chamber, which is used to contain waste catalyst particles and leachate, achieving thorough mixing and reaction between the two.

[0022] Both sides of the extraction cylinder 3 are equipped with main rollers 11, each with a ratchet structure 12. This ratchet structure 12 has a directional rotation function, ensuring that the main rollers 11 rotate in only one direction when the extraction cylinder 3 reciprocates. The main rollers 11 are connected to the filter cylinder 8 via a reducer 13. When the extraction cylinder 3 reciprocates on the guide rail 5, the main rollers 11 drive the reducer 13 through the ratchet structure 12, thereby driving the filter cylinder 8 to rotate slowly. The slow rotation of the filter cylinder 8 not only switches the microporous areas on it but also allows the spent catalyst particles to undergo multiple leaching treatments, thereby improving the extraction efficiency of vanadium and tungsten.

[0023] A secondary cylinder 14 is fixedly connected to one side of the extraction cylinder 3. Secondary rollers 15 are rotatably mounted on both sides of the secondary cylinder 14. The secondary rollers 15 cooperate with the guide rail frame 5 and are in the same plane as the main roller 11. A rectangular opening 16 is provided at the joint between the secondary cylinder 14 and the extraction cylinder 3. A vertically mounted guide frame 17 is fixedly connected inside the secondary cylinder 14. A horizontally mounted column 18 is slidably connected to the guide frame 17. A strip plate 19 is fixedly connected to one end of the column 18. A scraper 20 is mounted on the strip plate 19 for cleaning blockages on the surface of the filter cylinder 8. The other end of the column 18 is connected to a double-end frame 21. Both ends of the double-end frame 21 are fixedly connected to pins 22. Both sides of the inner cylinder 14 are provided with rotating wheels 23. Elliptical grooves 24 are opened on the rotating wheels 23. The elliptical grooves 24 cooperate with the pins 22. When the extraction cylinder 3 moves back and forth, the rotating wheels 23 cooperate with the pins 22 through the elliptical grooves 24, so that the scraper 20 at one end of the column 18 moves back and forth on the surface of the filter roller 8, thereby removing the blockage on the micropores.

[0024] An elastic partition 25 is fixedly connected to the column 18. The elastic partition 25 is sealed to the inner wall of the secondary cylinder 14, isolating the internal space of the secondary cylinder 14 into a closed chamber. The double-end frame 21 and the rotating wheel 23 are both located in the closed chamber. Channels 26 are opened in both the strip plate 19 and the column 18. Multiple spray holes 27 are provided on one side of the scraper 20 on the strip plate 19 for spraying cleaning fluid. An outlet pipe 28 is fixedly connected to the double-end frame 21. The outlet pipe 28 is connected to the channel 26. An inlet pipe 29 is fixedly installed on the top of the secondary cylinder 14. A dust cover 31 is fixedly connected to the top of the inlet pipe 29 to prevent external impurities from entering the pipe. One-way valves 30 are provided on both the outlet pipe 28 and the inlet pipe 29 to ensure that the flow direction of the cleaning fluid is unidirectional.

[0025] A detection box 32 is fixedly connected to the side of the extraction cylinder 3 opposite to the rectangular opening 16. A spectrometer 33 is installed inside the detection box 32 for real-time monitoring of the reaction in the mixing chamber. A transparent window 34 is fixedly installed at the joint between the detection box 32 and the extraction cylinder 3 so that the spectrometer 33 can accurately collect data. Electromagnetic clutches 35 are fixedly connected to both sides of the auxiliary cylinder 14. The electromagnetic clutches 35 control the transmission connection between the auxiliary roller 15 and the rotating wheel 23, thereby realizing the reciprocating movement of the scraper 20. A discharge chamber door 36 is provided on one side of the mixing chamber in the extraction cylinder 3. The discharge chamber door 36 can be closed or opened to discharge the waste catalyst particles after the reaction.

[0026] The working principle of this device is as follows: First, waste SCR denitrification catalyst particles and leachate are added to the mixing chamber inside the extraction cylinder 3. The reaction chamber 2 is then started, and the extraction cylinder 3 is driven to reciprocate on the guide rail frame 5 via the crank-connecting rod mechanism 6. This reciprocating movement of the extraction cylinder 3 ensures that the waste catalyst particles and leachate come into full contact and undergo a chemical reaction within the mixing chamber. Simultaneously, the reciprocating movement of the extraction cylinder 3 drives the filter drum 8 to rotate slowly via the ratchet structure 12 on the main roller 11 and the reducer 13. The rotation of the filter drum 8 not only switches between microporous areas but also allows the waste catalyst particles to undergo multiple leaching processes, thereby improving the extraction efficiency of vanadium and tungsten.

[0027] If the micropores on the surface of the filter roller 8 become clogged during the extraction process, they can be cleaned through the cleaning structure inside the secondary cylinder 14. When the extraction cylinder 3 reciprocates, the secondary roller 15 is connected to the rotating wheel 23 via the electromagnetic clutch 35. The elliptical groove 24 on the rotating wheel 23 engages with the pin 22 on the double-end frame 21, causing the scraper 20 at one end of the column 18 to reciprocate on the surface of the filter roller 8, thereby removing the blockages on the micropores. At the same time, cleaning fluid is injected into the secondary cylinder 14 through the liquid inlet pipe 29. The cleaning fluid is sprayed onto the surface of the filter roller 8 through the channel 26 and the spray hole 27 to further enhance the cleaning effect.

[0028] After extraction, the discharge chamber door 36 is opened to discharge the spent catalyst particles, and the leachate is collected into the subsequent treatment system via the guide plate 7. During the extraction process, the reaction in the mixing chamber can be monitored in real time by the spectrometer 33 in the detection box 32 so that the operating parameters can be adjusted in a timely manner to ensure that the extraction efficiency of vanadium and tungsten reaches the optimal level.

[0029] In summary, the SCR waste denitrification catalyst vanadium-tungsten co-extraction device provided by this utility model achieves efficient leaching through a simple mechanical structure, while also featuring low cleaning frequency and simplified cleaning. It can effectively solve the problems of low metal recovery rate, high impurity content, and poor waste gas emission control in traditional methods, thus meeting industrial needs.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vanadium-tungsten co-extraction device for SCR waste denitrification catalyst, comprising: The base (1) has a reaction chamber (2) on one side of its top, characterized in that it further includes: An extraction cylinder (3) with an open top and bottom is provided. A support plate (4) is fixedly provided on the other side of the top of the base (1). A guide rail frame (5) is fixed between the reaction chamber (2) and the support plate (4). The extraction cylinder (3) is located between the guide rail frames (5). The output end of the reaction chamber (2) is a crank-connecting rod mechanism (6) connected to the extraction cylinder (3). The reaction chamber (2) is used to drive the extraction cylinder (3) to move back and forth on the guide rail frame (5) through the crank-connecting rod mechanism (6). An inclined guide plate (7) is fixedly connected to the base (1). The guide plate (7) is located at the bottom of the extraction cylinder (3). Separation component; The separation component is located inside the extraction cylinder (3). The separation component includes a filter roller (8) rotatably disposed inside the extraction cylinder (3). The filter roller (8) has a plurality of uniformly arranged micropores. The separation component also includes two arc-shaped baffles (9) and two inclined baffles (10). The two arc-shaped baffles (9) are spaced apart along the axial direction of the filter roller (8) and fixedly connected to the inner walls of both sides of the extraction cylinder (3). The two inclined baffles (10) are spaced apart along the radial direction of the filter roller (8) and fixedly connected to the inner walls of both sides of the extraction cylinder (3). The height of the arc-shaped baffles (9) and the inclined baffles (10) is greater than the height of the axis of the filter roller (8). The arc-shaped baffles (9) and the inclined baffles (10) are both in contact with the surface of the filter roller (8). The arc-shaped baffles (9), the inclined baffles (10), the top surface of the filter roller (8) and the inner wall of the extraction cylinder (3) form a mixing chamber. Both sides of the extraction cylinder (3) are provided with main rollers (11) that cooperate with two guide rails (5). The main rollers (11) are provided with ratchet structures (12) with directional rotation function. The main rollers (11) and the filter roller (8) are connected by a reducer (13) fixedly set on the outer surface of the extraction cylinder (3).

2. The vanadium-tungsten co-extraction device for SCR waste denitrification catalyst according to claim 1, characterized in that, A secondary cylinder (14) is fixedly connected to the side of the extraction cylinder (3) away from the reaction chamber (2). A secondary roller (15) that cooperates with the guide rail frame (5) is rotatably arranged on both sides of the secondary cylinder (14). The secondary cylinder (14), the secondary roller (15), the main roller (11) and the filter roller (8) are all in the same plane.

3. The vanadium-tungsten co-extraction device for SCR waste denitrification catalyst according to claim 2, characterized in that, A rectangular opening (16) is provided at the junction of the extraction cylinder (3) and the auxiliary cylinder (14). A vertically arranged guide frame (17) is fixedly connected inside the auxiliary cylinder (14). A horizontally arranged column (18) is slidably connected to the guide frame (17). A strip plate (19) is fixedly connected to one end of the column (18) facing the rectangular opening (16). A scraper (20) is provided on the strip plate (19). A double-end frame (21) is connected to the other end of the column (18). Both ends of the frame (21) are fixedly connected with pins (22). The inner sides of the secondary cylinder (14) are provided with rotating wheels (23) that are connected to the secondary rollers (15). The rotating wheels (23) are provided with elliptical grooves (24) that cooperate with the pins (22). When the extraction cylinder (3) moves back and forth, the cooperation between the rotating wheels (23) and the pins (22) causes the scraper (20) at one end of the column (18) to move back and forth, so that it contacts the surface of the filter roller (8).

4. The vanadium-tungsten co-extraction device for SCR waste denitrification catalyst according to claim 3, characterized in that, An elastic partition (25) is fixedly connected to the column (18). The elastic partition (25) is sealed to the inner wall of the secondary cylinder (14). The elastic partition (25) is located between the guide frame (17) and the strip plate (19). The elastic partition (25) isolates the internal space of the secondary cylinder (14) into a closed chamber. The double-end frame (21) and the wheel (23) are both located in the closed chamber.

5. The vanadium-tungsten co-extraction device for SCR waste denitrification catalyst according to claim 4, characterized in that, The strip plate (19) and the column (18) are both provided with channels (26). Multiple spray holes (27) are provided on one side of the scraper (20) on the strip plate (19). A liquid outlet pipe (28) connected to the channel (26) is fixedly connected to the double-end frame (21). A liquid inlet pipe (29) is fixedly provided on the top of the secondary cylinder (14). A one-way valve (30) is provided on both the liquid outlet pipe (28) and the liquid inlet pipe (29). A dust cover (31) is fixedly connected to the top of the liquid inlet pipe (29).

6. The vanadium-tungsten co-extraction device for SCR waste denitrification catalyst according to claim 3, characterized in that, A detection box (32) is fixedly connected to the side of the extraction cylinder (3) opposite to the rectangular opening (16). A spectrometer (33) is installed inside the detection box (32). A transparent window (34) is fixedly installed at the joint between the detection box (32) and the extraction cylinder (3). Electromagnetic clutches (35) for driving the auxiliary roller (15) and the rotating wheel (23) are fixedly connected to both sides of the auxiliary cylinder (14).

7. The vanadium-tungsten co-extraction device for SCR waste denitrification catalyst according to claim 1, characterized in that, The mixing chamber in the extraction cylinder (3) is provided with a discharge chamber door (36) that can be closed or opened on one side.

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