Device for improving use efficiency of mechanical seal of oxygen pressure ammonia leaching molybdenum and rhenium extraction reaction kettle

Abstract

The invention discloses a device for improving the use efficiency of a mechanical seal of an oxygen pressure ammonia leaching molybdenum and rhenium extraction reaction kettle, which comprises a collection frame and a water tank mounted on the top surface of the collection frame and used for temporarily storing pure water, a reaction kettle assembly for oxygen pressure ammonia leaching molybdenum and rhenium extraction is mounted on the collection frame, and a stainless steel distributor is mounted on the top surface of the collection frame. A pumping assembly used for adjusting the outlet pressure along with the change of the pressure in the reaction kettle assembly is connected between the water inlet of the stainless steel distributor and the water outlet of the water tank, a balance tank is further installed on the collection frame, and the reaction kettle assembly comprises a kettle body installed with the collection frame in a combined mode. No mixed gas, no other mixture and pure water exist in the gap between the mechanical seal movable ring and the mechanical seal movable ring, crystals cannot be generated in the gap between the mechanical seal movable ring and the mechanical seal movable ring after shutdown, and the phenomenon that the mechanical seal movable ring and the mechanical seal movable ring are adhered is avoided, so that the phenomenon that the mechanical seal movable ring and the mechanical seal movable ring are damaged during secondary starting is avoided. And the mechanical seal moving and static rings are damaged due to adhesion of the mechanical seal moving and static rings.

Description

Technical Field

[0001] This invention relates to the field of oxygen pressure ammonia leaching technology for molybdenum concentrate, specifically to a device for improving the mechanical seal efficiency of an oxygen pressure ammonia leaching molybdenum-rhenium extraction reactor. Background Technology

[0002] Oxy-pressure ammonia leaching of molybdenum concentrate is carried out in a closed reactor. The reaction process is achieved by a high-speed rotating agitator, which brings the molybdenum concentrate into uniform contact with oxygen and ammonia water, and oxidizes the molybdenum concentrate under high temperature and pressure. The high-speed rotating agitator has a significant impact on the oxidation efficiency of the molybdenum concentrate to achieve effective oxidation. The agitator mainly consists of: agitator blades, motor and gearbox, support, agitator shaft, and mechanical seal. The agitator blades, motor and gearbox, support, and agitator shaft are not easily damaged during use and are durable. However, the mechanical seal is easily damaged due to changes in operating conditions, increasing equipment maintenance costs and affecting production. Especially during oxygen-pressure ammonia leaching of molybdenum concentrate, the gas phase in the reactor contains a large amount of gas that can crystallize upon cooling. This gas enters the gap between the moving and stationary rings of the mechanical seal. Due to the complex composition of the gas phase, the friction between the moving and stationary rings of the mechanical seal increases, causing significant damage to the seal's service life. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching reaction vessel for molybdenum-rhenium extraction, thereby solving the problem of easy damage to the mechanical seal in the reaction vessel for oxygen-pressure ammonia leaching of molybdenum concentrate mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a device for improving the mechanical seal utilization efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor, comprising a collection frame and a water tank installed on the top surface of the collection frame for temporarily storing pure water, wherein a reactor assembly for oxygen-pressure ammonia leaching molybdenum-rhenium extraction is installed on the collection frame, a stainless steel distributor is installed on the top surface of the collection frame, and a pumping assembly for adjusting the outlet pressure according to the pressure change inside the reactor assembly is connected between the inlet of the stainless steel distributor and the outlet of the water tank, wherein the outlet pressure of the pumping assembly is higher than the internal pressure of the reactor assembly, and a balance tank is also installed on the collection frame; The reactor assembly includes a vessel body assembled with a frame, an organic seal installed on the top of the vessel body, and a pressure gauge connected to the vessel body for detecting internal pressure. The balance tank includes a tank structure, inside which a piston structure is installed. Sealing liquid is stored above the piston structure. A high-pressure metal hose is connected between the outlet end of the tank structure and the mechanical seal. When the pumping assembly supplies pure water to the lower area inside the tank structure via a stainless steel distributor, the piston structure moves upward to pump the sealing liquid into the gap between the moving and stationary rings of the mechanical seal.

[0005] Preferably, the water inlet of the tank structure is located in the middle of the bottom surface; The piston structure consists of an O-ring that fits and seals against the inner wall of the tank structure and a piston rod installed in the middle of the top surface of the O-ring. The sealing liquid is located on the upper surface of the O-ring, and its top surface is lower than the height of the water outlet end of the tank structure.

[0006] Preferably, a top sealing plate is installed on the top of the tank structure via a flange, and a sealing sleeve is installed in the middle of the top surface of the top sealing plate.

[0007] Preferably, the top sealing plate is equipped with a reset structure located inside the sealing sleeve, which is used to restore the piston structure to its original position downwards when the supply of sealing fluid to the mechanical seal is paused. The reset structure can be either a telescopic spring or a cylinder.

[0008] Preferably, a motor is installed on the top of the vessel, and a stirring shaft that passes through the mechanical seal and extends into the interior of the vessel is installed at the output end of the motor.

[0009] Preferably, the pumping assembly includes a delivery conduit fixedly connected to the water outlet of the water tank, a hydraulic diaphragm metering pump connected to one end of the delivery conduit, and a stainless steel pipe fixedly connected to the output end of the hydraulic diaphragm metering pump and the inlet end of the stainless steel distributor.

[0010] Preferably, the stainless steel distributor includes a stainless steel pure water liquid seal tank fixedly installed on the top surface of the collection frame. The stainless steel pure water liquid seal tank has three outlets on its top. One outlet is equipped with a high-pressure metal hose II for connecting to the water inlet at the bottom of the tank structure. The middle outlet is equipped with a pressure gauge II for detecting the outlet pressure of the hydraulic diaphragm metering pump. The other outlet is equipped with a high-pressure metal hose III for allowing pure water to flow along the water inlet of the mechanical seal base into the space between the mechanical seal and the stirring shaft.

[0011] Preferably, a ball valve and a one-way shut-off valve are installed sequentially on the stainless steel pipe.

[0012] By means of the above technical solution, the present invention provides a device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor, which has at least the following beneficial effects: 1. This invention ensures that only sealing liquid enters the gap between the moving ring and the stationary ring of the reactor body, without any mixed gas from the reactor body, thus reducing the friction between the moving and stationary rings and making them less prone to damage.

[0013] 2. In this invention, pure water from the stainless steel distributor is fed into the reactor through the inlet of the mechanical seal base via a high-pressure metal hose. Since the inlet water pressure is slightly greater than the pressure inside the reactor and the gap between the mechanical seal and the stirring shaft is small, a water ring will be formed between the shaft and the mechanical seal when the stirring shaft rotates at high speed. This prevents the mixed gas in the reactor from entering the dynamic and static rings of the mechanical seal, thus protecting the dynamic and static rings of the mechanical seal.

[0014] 3. In this invention, there is no mixed gas in the gap between the dynamic and static rings of the mechanical seal, and there are no other mixtures in the sealing liquid. The gap between the dynamic and static rings of the mechanical seal contains only pure water. After shutdown, crystals will not be generated in the gap between the dynamic and static rings of the mechanical seal, thus avoiding the phenomenon of adhesion of the dynamic and static rings of the mechanical seal during secondary startup. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the reactor assembly of the present invention; Figure 3 This is a schematic diagram of the pumping assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the balance tank of the present invention; Figure 5 This is a schematic diagram of the top sealing plate and the reset structure of the present invention.

[0016] In the picture: 1. Collection rack; 2. Water tank; 3. Reactor components; 301. Reactor body; 302. Mechanical seal; 303. Pressure gauge 1; 304. Motor; 305. Stirring shaft; 4. Stainless steel distributor; 401. Stainless steel pure water liquid seal tank; 402. High-pressure metal hose II; 403. Pressure gauge II; 404. High-pressure metal hose III; 5. Pumping assembly; 501. Delivery conduit; 502. Hydraulic diaphragm metering pump; 503. Stainless steel pipe; 5031. Ball valve; 5032. Check valve; 6. Balance tank; 601. Tank structure; 602. Piston structure; 603. Sealing liquid; 604. High-pressure metal hose 1; 605. Top sealing plate; 606. Sealing sleeve; 607. Reset structure. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0018] Currently, the oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor uses a mechanical seal for stirring. This seal relies on the pressure of the sealing fluid and the elasticity of the elastic element to bring the two end faces of the rotating and stationary rings into contact and move relative to each other. These two sealing end faces fit tightly together, forming a tiny gap. When pressurized media passes through this gap, an extremely thin liquid film forms, creating resistance and preventing leakage. Simultaneously, this liquid film lubricates the end faces, ensuring a long-term sealing effect. The pressurized medium, also known as the sealing fluid, is injected into the sealing surface through an external vertical balancing tank. The pressure in the vertical balancing tank comes from the pressure inside the reactor, which is pumped to the bottom of the tank through a metal pipe. The piston movement within the vertical balancing tank forces the sealing fluid through the metal pipe into the gap between the rotating and stationary rings of the mechanical seal, achieving both lubrication and sealing. However, in actual use, the reactor is constantly under high temperature (170 degrees Celsius) and high pressure (2.0 MPa) conditions. The gas in the reactor's gas phase is a complex gas composed of multiple gases, mainly oxygen, ammonia, water vapor, and vaporized ammonium sulfate. When the vaporized ammonium sulfate gas is injected from the high temperature inside the reactor into the metal pipe outside the reactor (at room temperature), the temperature drops rapidly to room temperature. Upon cooling, the vaporized ammonium sulfate gas liquefies, and the ammonium sulfate crystals within the liquid solidify and adhere to the inner wall of the metal pipe. This cycle repeats multiple times until the inner wall of the metal pipe is completely filled with ammonium sulfate crystals. The gas inside the reactor cannot enter the balance vertical tank, which pushes the piston at the bottom, forcing the sealing liquid into the gap between the moving and stationary rings of the mechanical seal. At this point, due to the high pressure inside the reactor, the mixed gas enters the gap between the moving and stationary rings of the mechanical seal. When the mechanical seal's rotating and stationary rings are undamaged and the gap is small, the gas can effectively seal and lubricate. However, when the gap is large, the gas will enter the sealing fluid. In this case, the sealing fluid is no longer pure water, but a liquid containing ammonium sulfate and other impurities.

[0019] When gas from the reactor enters the gap between the moving and stationary rings of the mechanical seal, its complex composition increases the friction between them, potentially damaging the seal. Furthermore, if gas from the reactor enters the sealing fluid, ammonium sulfate will dissolve, altering the fluid's composition and also increasing friction, leading to further damage.

[0020] Example 1 Please see Figures 1-5 This embodiment proposes a device for improving the efficiency of mechanical seals in an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor. This device effectively prevents gas from entering the sealing liquid within the reactor, thus avoiding increased friction between the dynamic and stationary rings of the mechanical seal. The device includes a collection frame 1 and a water tank 2, made of PP material and with a volume of 5 cubic meters, mounted on the top surface of the collection frame 1 for temporary storage of pure water. The reactor assembly 3, mounted on the collection frame 1, is used for oxygen-pressure ammonia leaching molybdenum-rhenium extraction. A 10L stainless steel distributor 4, with a pressure of 3.0 MPa, is installed on the top surface of the collection frame 1. A pump assembly 5 is connected between the inlet of the stainless steel distributor 4 and the outlet of the water tank 2. Its outlet pressure is adjusted according to the pressure changes within the reactor assembly 3, with the outlet pressure of the pump assembly 5 being higher than the internal pressure of the reactor assembly 3. A 1-liter balance tank with a pressure resistance of 4.0 MPa is also installed on the collection frame 1. The reactor assembly 3 includes a reactor body 301 assembled with the assembly frame 1. A mechanical seal 302 with a pressure of 4.0 MPa and a shaft diameter of 110 mm is installed on the top of the reactor body 301. A 0-6 MPa ammonia-resistant pressure gauge 303 for detecting internal pressure is connected to the reactor body 301. The balance tank 6 includes a tank structure 601. A piston structure 602 is installed inside the tank structure 601. A sealing liquid 603 is stored above the piston structure 602. A high-pressure metal hose 604 is connected between the outlet end of the tank structure 601 and the mechanical seal 302. When the pumping assembly 5 supplies pure water to the lower area inside the tank structure 601 through the stainless steel distributor 4, the piston structure 602 moves upward to pump the sealing liquid 603 into the gap between the moving ring and the stationary ring in the mechanical seal 302.

[0021] Specifically, the water inlet of the tank structure 601 is located in the middle of the bottom surface. The piston structure 602 consists of an O-ring that fits and seals against the inner wall of the tank structure 601 and a piston rod installed in the middle of the top surface of the O-ring. The sealing liquid 603 is located on the upper surface of the O-ring, and its top surface is lower than the height of the water outlet of the tank structure 601.

[0022] In practical applications, pressure gauge 303 monitors the internal pressure of reactor 301 in real time and feeds it back to pumping assembly 5. When pure water from stainless steel distributor 4 is delivered from the bottom of balance tank 6 to the interior of tank structure 601, the outlet pressure of pumping assembly 5 is set higher than the internal pressure of reactor assembly 3. This causes the thrust of the water to move piston structure 602 upward within tank structure 601, thereby lifting the sealing liquid 603 above it. This liquid is then pumped through high-pressure metal hose 604 into the gap between the moving and stationary rings of mechanical seal 302, where the sealing liquid 603 provides lubrication and sealing. Furthermore, because the pure water pressure in stainless steel distributor 4 is slightly higher than the pressure inside the reactor, the gap between the moving and stationary rings of mechanical seal 302 contains only sealing liquid, without the mixed gas from the reactor. This results in low friction between the moving and stationary rings, reducing the risk of damage. The previously easily clogged metal pipes are now improved to prevent clogging when filled with pure water.

[0023] Example 2 In order to promptly stop the supply of sealing fluid to the gap between the moving and stationary rings of mechanical seal 302 after the entire reactor has stopped operating, such as Figure 4 As shown, a top sealing plate 605 is installed on the top of the tank structure 601 via a flange. A sealing sleeve 606 is installed in the middle of the top surface of the top sealing plate 605. A reset structure 607, which is located inside the sealing sleeve 606, is installed on the top sealing plate 605 and is used to restore the piston structure 602 to its original position when the supply of sealing liquid 603 to the mechanical seal 302 is stopped. The reset structure 607 is a telescopic spring. In actual application, when the reactor assembly 3 stops operating, the pumping assembly 5 stops simultaneously, so that there is no new pure water replenishment inside the tank structure 601. Therefore, the bottom of the piston structure 602 is not subjected to upward thrust, and the telescopic spring that was originally subjected to thrust returns to its original state under its own elasticity and reset action, thereby pushing the piston structure 602 downward to its original position. The sealing liquid 603 on the piston structure 602 also decreases in height until it is below the height of the outlet of the tank structure 601.

[0024] Example 3 Figure 5 In one embodiment of the present invention, a cylinder is used as a reset structure 607 to restore the piston structure 602 to its original position downwards. Compared with a telescopic spring, the cylinder provides more flexible and faster control over the lifting and lowering of the piston structure 602. Its application requires matching the water delivery rate of the pumping assembly 5.

[0025] Example 4 After the unit is shut down, ammonium sulfate gas or liquid remains in the gap between the rotating and stationary rings of mechanical seal 302. Upon cooling, this gas or liquid crystallizes in the gap, causing adhesion and increased resistance during rotation. Restarting the reactor agitator easily damages the rotating and stationary rings of mechanical seal 302. Many instances of mechanical seal 302 failure occur during startup. The longer the shutdown time, the more likely this failure will occur. To effectively solve this problem, such as... Figures 1-3 , Figure 5 As shown, a motor 304 is installed on the top of the vessel body 301. A stirring shaft 305, which passes through the mechanical seal 302 and extends into the vessel body 301, is installed at the output end of the motor 304. The stainless steel distributor 4 includes a stainless steel pure water liquid seal tank 401 fixedly installed on the top surface of the collection frame 1. Three outlets are provided on the top of the stainless steel pure water liquid seal tank 401. A high-pressure metal hose 402 for connecting to the water inlet at the bottom of the tank structure 601 is installed on one outlet. A pressure gauge 403 for detecting the outlet pressure of the hydraulic diaphragm metering pump 502 is installed on the middle outlet. A high-pressure metal hose 404 for allowing pure water to flow along the water inlet of the mechanical seal 302 base into the space between the mechanical seal 302 and the stirring shaft 305 is installed on the other outlet. The high-pressure metal hoses 402 and 404 are preferably of type DN15 and PN40. The pumping assembly 5 includes a delivery conduit 501 fixedly connected to the outlet end of the water tank 2. A hydraulic diaphragm metering pump 502 is connected to one end of the delivery conduit 501. A stainless steel pipe 503 is fixedly connected to the output end of the hydraulic diaphragm metering pump 502 and the inlet end of the stainless steel distributor 4. A ball valve 5031 and a one-way shut-off valve 5032 are installed sequentially on the stainless steel pipe 503.

[0026] Specifically, both ball valve 5031 and check valve 5032 are made of 304 stainless steel, with DN15 and PN40 specifications being preferred. Stainless steel pipe 503 is also preferably DN15 and PN40. Ball valve 5031 is installed upstream of check valve 5032. Ball valve 5031 is used to cut off or regulate the fluid in the pipeline according to the internal pressure of the vessel body 301, while check valve 5032 is used to prevent backflow of pure water into stainless steel pipe 503.

[0027] In practical applications, 3 cubic meters of pure water are injected into water tank 2, and then the flow rate of hydraulic diaphragm metering pump 502 is adjusted to 20 L / h. After the reactor agitation is started, hydraulic diaphragm metering pump 502 is turned on. The outlet pressure of hydraulic diaphragm metering pump 502 changes with the pressure inside the reactor. When the reactor pressure increases, the outlet pressure of hydraulic diaphragm metering pump 502 increases accordingly. When the reactor pressure decreases, the outlet pressure of hydraulic diaphragm metering pump 502 decreases accordingly. The pressure of hydraulic diaphragm metering pump 502 is always 0.1 kg higher than the pressure inside the reactor. When hydraulic diaphragm metering pump 502 is turned on, water in water tank 2 flows into stainless steel pipe 503 through the outlet of hydraulic diaphragm metering pump 502, passes through ball valve 5031, and enters the interior of stainless steel distributor 4 through one-way shut-off valve 5032. The high-pressure metal hose 404 connected to the stainless steel distributor 4 is connected to the water inlet of the mechanical seal 302 base. Since the inlet water pressure is slightly greater than the pressure inside the reactor body 301, pure water will flow into the reactor through the water inlet of the mechanical seal 302 base. Because the gap between the mechanical seal 302 and the stirring shaft 305 is small, when the shaft rotates at high speed, a water ring will be formed between the shaft and the mechanical seal 302, thereby preventing the mixed gas in the reactor from entering the dynamic and static rings of the mechanical seal 302, thus protecting the dynamic and static rings of the mechanical seal 302.

[0028] Within the gap between the dynamic and static rings of mechanical seal 302, there are no mixed gases and no other mixtures in the sealing liquid 603. Only pure water exists within the gap. After shutdown, crystals will not form within the gap, preventing the dynamic and static rings of mechanical seal 302 from sticking together. This avoids damage to the dynamic and static rings of mechanical seal 302 during secondary startup due to sticking.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor, comprising a collection rack (1) and a water tank (2) installed on the top surface of the collection rack (1) for temporarily storing pure water, characterized in that: The collection rack (1) is equipped with a reactor assembly (3) for oxygen pressure ammonia leaching molybdenum rhenium extraction. A stainless steel distributor (4) is installed on the top surface of the collection rack (1). A pump assembly (5) is connected between the inlet of the stainless steel distributor (4) and the outlet of the water tank (2) for adjusting the outlet pressure according to the pressure change inside the reactor assembly (3). The outlet pressure of the pump assembly (5) is higher than the internal pressure of the reactor assembly (3). A balance tank (6) is also installed on the collection rack (1). The reactor assembly (3) includes a vessel body (301) assembled with the assembly frame (1), an organic seal (302) is installed on the top of the vessel body (301), and a pressure gauge (303) for detecting internal pressure is connected to the vessel body (301). The balance tank (6) includes a tank structure (601), a piston structure (602) is installed inside the tank structure (601), a sealing liquid (603) is stored above the piston structure (602), and a high-pressure metal hose (604) is connected between the outlet end of the tank structure (601) and the mechanical seal (302) for pumping the sealing liquid (603) into the gap between the moving ring and the stationary ring in the mechanical seal (302) when the pumping assembly (5) supplies pure water to the lower area inside the tank structure (601) through the stainless steel distributor (4).

2. The device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor according to claim 1, characterized in that: The water inlet of the tank structure (601) is located in the middle of the bottom surface; The piston structure (602) consists of an O-ring that is fitted and sealed to the inner wall of the tank structure (601) and a piston rod installed in the middle of the top surface of the O-ring. The sealing liquid (603) is located on the upper surface of the O-ring, and its top surface is lower than the height of the water outlet end of the tank structure (601).

3. The device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor according to claim 2, characterized in that: The top of the tank structure (601) is fitted with a top sealing plate (605) via a flange, and a sealing sleeve (606) is installed in the middle of the top surface of the top sealing plate (605).

4. The device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor according to claim 3, characterized in that: The top sealing plate (605) is equipped with a reset structure (607) located inside the sealing sleeve (606) for restoring the piston structure (602) to its original position downward when the supply of sealing fluid (603) to the mechanical seal (302) is suspended. The reset structure (607) can be either a telescopic spring or a cylinder.

5. The device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor according to claim 1, characterized in that: A motor (304) is installed on the top of the vessel body (301), and a stirring shaft (305) is installed at the output end of the motor (304), which passes through the mechanical seal (302) and extends into the interior of the vessel body (301).

6. The device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor according to claim 5, characterized in that: The pumping assembly (5) includes a delivery conduit (501) fixedly connected to the outlet end of the water tank (2), and a hydraulic diaphragm metering pump (502) is connected to one end of the delivery conduit (501). A stainless steel pipe (503) is fixedly connected to the output end of the hydraulic diaphragm metering pump (502) and the inlet end of the stainless steel distributor (4).

7. The device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor according to claim 6, characterized in that: The stainless steel distributor (4) includes a stainless steel pure water liquid seal tank (401) fixedly installed on the top surface of the collection frame (1). Three outlets are provided on the top of the stainless steel pure water liquid seal tank (401). One outlet is equipped with a high-pressure metal hose II (402) for connecting to the bottom water inlet of the tank structure (601). The middle outlet is equipped with a pressure gauge II (403) for detecting the outlet pressure of the hydraulic diaphragm metering pump (502). The other outlet is equipped with a high-pressure metal hose III (404) for allowing pure water to flow along the water inlet of the mechanical seal (302) base into the space between the mechanical seal (302) and the stirring shaft (305).

8. The device for improving the mechanical seal efficiency of an oxygen-pressure ammonia leaching molybdenum-rhenium extraction reactor according to claim 7, characterized in that: A ball valve (5031) and a one-way shut-off valve (5032) are sequentially installed on the stainless steel pipe (503).

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