Device and method for extracting vanadium from vanadium-containing steel slag

Abstract

The invention relates to a device and method for extracting vanadium from vanadium-containing steel slag, and belongs to the technical field of vanadium extraction. The device and method for extracting vanadium from vanadium-containing steel slag comprise a vanadium extraction tank and further comprise a material dispersing mechanism; a transmission mechanism; a gas injection mechanism; and a refining mechanism. Through cooperative use of the material dispersing mechanism and the transmission mechanism, the grinding efficiency of the material dispersing roller on the powdery vanadium-containing steel slag and the sodium salt is improved, so that the particle size reduction rate of the powdery vanadium-containing steel slag and the sodium salt is increased, vanadium existing in mineral lattices can be exposed, and the mineral quality is improved. In addition, the powdery vanadium-containing steel slag and the sodium salt located at the bottom can be conveyed upwards, and the powdery vanadium-containing steel slag and the sodium salt located at the top can be conveyed downwards, so that the heating uniformity of the powdery vanadium-containing steel slag and the sodium salt is further promoted; and the phenomenon that the powdery vanadium-containing steel slag and sodium salt are caked due to uneven temperature is avoided, so that the frequency of shutdown cleaning is reduced, and the quality and efficiency of vanadium extraction are further improved.

Description

Technical Field

[0001] This invention belongs to the field of vanadium extraction technology, specifically relating to a vanadium extraction device and method for vanadium-containing steel slag. Background Technology

[0002] Extracting vanadium from vanadium-containing steel slag (mainly vanadium-containing slag produced during converter steelmaking) is generally more challenging than extracting vanadium from vanadium-titanium magnetite or vanadium slag because steel slag has a complex composition (high calcium, high iron, high silicon), relatively low vanadium content (usually lower than vanadium slag), and diverse vanadium occurrence states. The main vanadium extraction process can be summarized as follows: raw material pretreatment: crushing and grinding: magnetic separation for iron removal: vanadium conversion and release: high-temperature leaching, etc., among which high-temperature leaching often employs high-temperature sodium formation, high-temperature calcification, etc.

[0003] Currently, in high-temperature sodium vanadium extraction operations, vanadium in steel slag often exists in isomorphous form within the crystal lattices of minerals such as calcium silicate and calcium ferrite. This makes it difficult for the sodium vanadium extracting agent to fully react with the vanadium in the steel slag. Furthermore, during high-temperature vanadium extraction, vanadium-containing steel slag is usually piled up in one piece, which leads to uneven heating during the high-temperature sodium vanadium extraction operation. In addition, because the steel slag contains high levels of calcium and iron, it forms a low-melting-point eutectic phase with sodium salts at high temperatures, which adheres to the inner surface of the vanadium extraction equipment and forms hard lumps. This requires frequent shutdowns for cleaning, affecting the quality and efficiency of vanadium extraction. Based on these issues, a vanadium extraction device and method for vanadium-containing steel slag is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a reasonably designed vanadium extraction device and method for vanadium-containing steel slag in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A vanadium extraction device for vanadium-containing steel slag includes a vanadium extraction tank, a feeding hopper, a discharge pipe, an exhaust pipe, an electric heating plate, and a heating hopper, and further includes: A bulk material dispersing mechanism for dispersing powdery vanadium-containing steel slag and sodium salts, which is fixedly connected to the middle of the vanadium extraction tank and attached to the top of the heating hopper. A transmission mechanism fixedly connected to the inner surface of the vanadium lifting tank for driving the rotation of the bulk material handling mechanism; A gas injection mechanism fixedly connected to the top of the vanadium extraction tank for injecting gas into powdered vanadium-containing steel slag and sodium salt; A uniform material distribution mechanism fixedly connected to the outer surface of the bulk material distribution mechanism for uniformly releasing powdered vanadium-containing steel slag and sodium salt into the heating hopper.

[0006] As a further optimization of the present invention, the bulk material mechanism includes a servo motor fixedly connected to the middle position of the top of the vanadium extraction tank. The output end of the servo motor is fixedly connected to a rotating shaft. A bulk material roller is rotatably connected to the bottom of the rotating shaft. A bulk material groove is opened on the outer surface of the bulk material roller. A bulk material hook is fixedly connected to the outer surface of the bulk material roller inside the bulk material groove.

[0007] As a further optimization of the present invention, the rotating shaft passes through the vanadium extraction tank and is rotatably connected to the vanadium extraction tank in a sealed manner. The outer surfaces of the material distribution roller and the material distribution hook are both rough, and the outer diameter of the material distribution hook is slightly larger than the outer diameter of the material distribution roller. The outer surfaces of the material distribution roller and the material distribution hook are both left with a gap from the top of the heating hopper.

[0008] As a further optimization of the present invention, the transmission mechanism includes a fixed ring fixedly connected to the inner surface of the vanadium extraction tank, a gear ring fixedly connected to the bottom of the fixed ring, a rotating ring rotatably connected to the bottom of the fixed ring, and a gear fixedly connected to the end of the material roller, the gear meshing with the gear ring.

[0009] As a further optimization of the present invention, the material roller passes through the rotating ring and is rotatably connected to the rotating ring in a sealed manner, and the bottom of the rotating ring is rotatably connected to the top of the heating hopper in a sealed manner.

[0010] As a further optimization of the present invention, the gas injection mechanism includes a gas pump fixedly connected to the top of the vanadium extraction tank, a suction pipe fixedly connected to the top of the gas pump, a gas injection pipe fixedly connected to the bottom of the gas pump, a gas guide ring fixedly connected to the inner surface of the vanadium extraction tank, the gas injection pipe fixedly connected to the gas guide ring, a connecting air passage opened inside the rotating shaft, an air inlet hole opened at the top of the connecting air passage on the side wall of the rotating shaft, the air inlet hole being located inside the gas guide ring, an exhaust air passage opened inside the material distribution roller, the exhaust air passage being connected to the interior of the connecting air passage, and a material distribution air hole opened on the material distribution roller, which is connected to the interior of the exhaust air passage.

[0011] As a further optimization of the present invention, the rotating shaft passes through the air guide ring and is rotatably connected to the air guide ring in a sealed manner, and the bulk material air hole is located inside the bulk material hook.

[0012] As a further optimization of the present invention, the material leveling mechanism includes a material leveling hopper fixedly connected to the outer surface of the rotating shaft, and the material leveling hopper is provided with material leveling holes.

[0013] As a further optimization of the present invention, the feeding hopper is fixedly connected to the top of the vanadium extraction tank, the heating hopper is fixedly connected inside the vanadium extraction tank and is configured as a funnel shape, the bottom of the heating hopper is fixedly connected to the discharge pipe, the discharge pipe passes through the vanadium extraction tank and is fixedly connected to the vanadium extraction tank, the exhaust pipe is fixedly connected to the top of the vanadium extraction tank, the electric heating plate is fixedly connected to the inner surface of the vanadium extraction tank and is located below the heating hopper, and a temperature sensor is fixedly connected to the inner top of the vanadium extraction tank.

[0014] A method for extracting vanadium from vanadium-containing steel slag includes the following steps: Step 1: Close the discharge pipe, start the electric heating plate and detect the internal temperature of the vanadium extraction tank through the temperature sensor, then start the servo motor to make the shaft rotate, and then add powdered vanadium-containing steel slag and sodium salt into the vanadium extraction tank through the feeding hopper; Step 2: The powdered vanadium-containing steel slag and sodium salt added to the vanadium extraction tank will fall into the uniform hopper and then into the heating hopper through the uniform hopper hole; Step 3: After adding the material, close the feeding hopper and turn on the exhaust pipe and air pump; Step 4: The rotating shaft will drive the bulk material roller to revolve, and at the same time the bulk material roller will rotate under the action of the transmission mechanism, crushing the powdery vanadium-containing steel slag and sodium salt. Step 5: The air pump extracts gas and blows the extracted gas through the bulk material vent to the powdered vanadium-containing steel slag and sodium salt. Step 6: After the heating time is reached, turn off the electric heating plate and open the discharge pipe to discharge the residue containing sodium metavanadate obtained after heating; Step 7: Soak the obtained residue containing sodium metavanadate in water or dilute alkaline solution to dissolve the sodium metavanadate inside the residue. After the dissolution time is reached, filter to obtain a solution containing sodium metavanadate. Then, carry out subsequent processing to obtain the final product vanadium pentoxide.

[0015] The beneficial effects of this invention are as follows: 1. This invention, through the combined use of a material distribution mechanism and a transmission mechanism, enables the material distribution roller to rotate during its revolution, thereby improving the grinding efficiency of the material distribution roller on powdered vanadium-containing steel slag and sodium salt. This accelerates the reduction rate of the particle size of the powdered vanadium-containing steel slag and sodium salt, exposing the vanadium contained in the mineral lattice, and further improving the flowability of the powdered vanadium-containing steel slag and sodium salt. This also results in more uniform heating of the powdered vanadium-containing steel slag and sodium salt. Simultaneously, the rotation of the material distribution roller will drive the material distribution hook to rotate, causing the hook to collect the powdered material at the bottom. The upward conveying of vanadium-containing steel slag and sodium salt allows the powdery vanadium-containing steel slag and sodium salt at the bottom to flow to the top and vice versa. This further promotes the uniformity of heating of the powdery vanadium-containing steel slag and sodium salt, resulting in a more complete reaction and improving the efficiency of the reaction to produce sodium metavanadate. It also avoids the agglomeration of powdery vanadium-containing steel slag and sodium salt caused by uneven temperature, thereby reducing the number of shutdowns for cleaning and further improving the quality and efficiency of vanadium extraction.

[0016] 2. This invention, through the arrangement of a material roller that rotates on its own axis while revolving around the sun, and the air jet operation of the material jet vents, achieves two main benefits. First, it enables the uniform injection of air into the powdered vanadium-containing steel slag and sodium salt, allowing the air to contact the powdered vanadium-containing steel slag and sodium salt in various parts, thus improving the oxidation efficiency of the powdered vanadium-containing steel slag and sodium salt. Second, during air jetting, the material jet vents can blow the powdered vanadium-containing steel slag and sodium salt near the center toward the inner surface of the vanadium extraction tank. The powdered vanadium-containing steel slag and sodium salt near the inner surface of the vanadium extraction tank can flow inward, changing the position of the powdered vanadium-containing steel slag and sodium salt in the heating hopper. This further improves the fluidity and heating uniformity of the powdered vanadium-containing steel slag and sodium salt, resulting in a more complete reaction and increasing the efficiency of the reaction to form sodium metavanadate. This, in turn, improves the efficiency of vanadium extraction from the vanadium-containing steel slag and avoids the agglomeration of the powdered vanadium-containing steel slag and sodium salt.

[0017] 3. The present invention, through the setting of the uniform feeding mechanism, ensures that when powdered vanadium-containing steel slag and sodium salt are added through the feeding hopper, the rotation of the shaft will drive the uniform feeding hopper to rotate, thereby causing the uniform feeding hopper to evenly release the powdered vanadium-containing steel slag and sodium salt onto the top of the heating hopper through the uniform feeding holes. This avoids the accumulation of powdered vanadium-containing steel slag and sodium salt at the top of the heating hopper, which would cause uneven heating of the powdered vanadium-containing steel slag and sodium salt, affecting the quality and efficiency of vanadium extraction from the vanadium-containing steel slag, thus shortening the vanadium extraction time and saving resources. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall frontal three-dimensional structure of the present invention; Figure 2This is a schematic diagram of the frontal cross-section of the present invention; Figure 3 This is the invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a three-dimensional partial cross-sectional front view of the present invention; Figure 5 This is a schematic diagram of the three-dimensional partial cross-section of the present invention from a bottom view; Figure 6 This is a three-dimensional partial cross-sectional structural diagram of the material handling mechanism and transmission mechanism of the present invention; Figure 7 This is a schematic diagram of the three-dimensional partial cross-sectional structure of the material roller of the present invention; Figure 8 This is a three-dimensional structural diagram of the material leveling mechanism of the present invention.

[0019] In the diagram: 1. Vanadium extraction tank; 2. Feeding hopper; 3. Discharge pipe; 4. Exhaust pipe; 5. Electric heating plate; 6. Heating hopper; 7. Material dispersing mechanism; 71. Servo motor; 72. Rotating shaft; 73. Material dispersing roller; 74. Material dispersing trough; 75. Material dispersing hook; 8. Transmission mechanism; 81. Fixed ring; 82. Gear ring; 83. Rotating ring; 84. Gear; 9. Air injection mechanism; 91. Air pump; 92. Air extraction pipe; 93. Air injection pipe; 94. Air guide ring; 95. Air inlet; 96. Connecting air passage; 97. Exhaust air passage; 98. Material dispersing air hole; 10. Material leveling mechanism; 101. Material leveling hopper; 102. Material leveling hole; 11. Temperature sensor. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, a vanadium extraction device for vanadium-containing steel slag includes a vanadium extraction tank 1, a feeding hopper 2, a discharge pipe 3, an exhaust pipe 4, an electric heating plate 5, and a heating hopper 6. The feeding hopper 2 is fixedly connected to the top of the vanadium extraction tank 1, and an electric valve is installed inside the feeding hopper 2. The heating hopper 6 is fixedly connected inside the vanadium extraction tank 1 and is funnel-shaped. The bottom of the heating hopper 6 is fixedly connected to the discharge pipe 3, which passes through the vanadium extraction tank 1 and is fixedly connected to it. An electric valve is installed at one end of the discharge pipe 3 in the heating hopper 6. The exhaust pipe 4 is fixedly connected to the top of the vanadium extraction tank 1 and is fixedly connected to a gas treatment tank. The gas treatment tank is filled with a treatment liquid (the gas treatment tank is existing technology). (Not shown in the figure, and will not be described in detail). An electric valve is installed inside the exhaust pipe 4. An electric heating plate 5 is fixedly connected to the inner surface of the vanadium extraction tank 1 and is located below the heating hopper 6. A temperature sensor 11 is fixedly connected to the top of the vanadium extraction tank 1. A material dispersing mechanism 7 is fixedly connected to the middle of the vanadium extraction tank 1, which is attached to the top of the heating hopper 6 and is used to disperse powdered vanadium-containing steel slag and sodium salt. The powdered vanadium-containing steel slag and sodium salt are powdered vanadium-containing steel slag and sodium salt after grinding and mixing. The sodium salt can be sodium chloride or sodium carbonate, preferably sodium carbonate. The material dispersing mechanism 7 includes a servo motor 71 fixedly connected to the middle of the top of the vanadium extraction tank 1. The servo motor 71, electric valve, Temperature sensor 11 and electric heating plate 5 are both controlled by a controller (the controller is existing technology, not shown in the figure, and will not be described in detail). The output end of servo motor 71 is fixedly connected to a rotating shaft 72. The bottom of the rotating shaft 72 is rotatably connected to the heating bucket 6 via a mounting bracket. The heating bucket 6 is made of high thermal conductivity ceramic material. The rotating shaft 72 passes through the vanadium extraction tank 1 and is rotatably connected to it. A material distribution roller 73 is rotatably connected to the bottom of the rotating shaft 72. A material distribution groove 74 is opened on the outer surface of the material distribution roller 73. A material distribution hook 75 is fixedly connected to the outer surface of the material distribution roller 73. The material distribution hook 75 is located in the material distribution groove 74. The end of the material distribution hook 75 is set as an arc coaxial with the material distribution roller 73. The structure facilitates the entry of powdered vanadium-containing steel slag and sodium salt into the bulk material hook 75. The outer surfaces of both the bulk material roller 73 and the bulk material hook 75 are rough, and the outer diameter of the bulk material hook 75 is slightly larger than that of the bulk material roller 73. This allows for better upward conveying of the powdered vanadium-containing steel slag and sodium salt located below. Furthermore, because the bulk material hook 75 protrudes from the bulk material roller 73, the bulk material hook 75 and the bulk material roller 73 can generate different extrusion forces on the powdered vanadium-containing steel slag and sodium salt, thereby better grinding the powdered vanadium-containing steel slag and sodium salt and facilitating greater dispersion of the powdered vanadium-containing steel slag and sodium salt. The outer surfaces of both the bulk material roller 73 and the bulk material hook 75 have gaps between them and the top of the heating hopper 6 to facilitate the passage of the powdered vanadium-containing steel slag and sodium salt.

[0022] During use, the electric heating plate 5 is activated, and the internal temperature of the vanadium extraction tank 1 is detected by the temperature sensor 11. When the internal temperature reaches 750℃ or above, the electric valve in the discharge pipe 3 is closed, and the electric valve in the feeding hopper 2 is opened. Powdered vanadium-containing steel slag and sodium salt are added to the vanadium extraction tank 1 through the feeding hopper 2. The servo motor 71 is activated during addition, and the added powdered vanadium-containing steel slag and sodium salt will fall onto the heating hopper 6. This continues until a sufficient amount of powdered vanadium-containing steel slag and sodium salt is added. The servo motor 71 will then operate. This will drive the rotating shaft 72 to rotate, which in turn drives the dispersing roller 73 to revolve. The revolve of the dispersing roller 73, in conjunction with the dispersing trough 74, will stir and grind the powdered vanadium-containing steel slag and sodium salt falling onto the heating hopper 6, further reducing the particle size of the powdered vanadium-containing steel slag and sodium salt, while increasing the fluidity of the powdered vanadium-containing steel slag and sodium salt. This will result in more uniform heating of the powdered vanadium-containing steel slag and sodium salt, making the reaction of the powdered vanadium-containing steel slag and sodium salt more complete, and increasing the reaction rate of vanadium-containing steel slag and sodium salt to produce sodium metavanadate. This improves the efficiency of vanadium extraction from vanadium-containing steel slag, shortens the extraction time, saves resources, and the gas generated during the vanadium extraction process will be discharged into the treatment liquid through exhaust pipe 4, where the treatment liquid will absorb the vanadium component gas generated during vanadium extraction.

[0023] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a transmission mechanism 8 for driving the material handling mechanism 7 to rotate is fixedly connected to the inner surface of the vanadium extraction tank 1. The transmission mechanism 8 includes a fixed ring 81 fixedly connected to the inner surface of the vanadium extraction tank 1, a gear ring 82 fixedly connected to the bottom of the fixed ring 81, a rotating ring 83 sealed and rotatably connected to the bottom of the fixed ring 81, a material handling roller 73 passing through the rotating ring 83 and sealed and rotatably connected to the rotating ring 83, a bottom of the rotating ring 83 sealed and rotatably connected to the top of the heating hopper 6, and a gear 84 fixedly connected to the end of the material handling roller 73, the gear 84 meshing with the gear ring 82.

[0024] During use, the revolution of the material distribution roller 73 will drive the rotating ring 83 to rotate along the bottom of the fixed ring 81 and the top of the heating hopper 6, thereby causing the gear 84 to move along the bottom of the gear ring 82. During the movement of the gear 84, since the gear 84 meshes with the gear ring 82, the gear 84 will rotate, thereby driving the material distribution roller 73 to rotate. This rotation of the material distribution roller 73 during its revolution further improves the grinding efficiency of the material distribution roller 73 on the powdered vanadium-containing steel slag and sodium salt, accelerates the reduction rate of the particle size of the powdered vanadium-containing steel slag and sodium salt, and further improves the flowability of the powdered vanadium-containing steel slag and sodium salt, making the powdered vanadium-containing steel slag and sodium salt more uniformly heated. At the same time, the material distribution roller 73... The rotation of component 3 will drive the bulk material hook 75 to rotate, causing it to transport the powdered vanadium-containing steel slag and sodium salt at the bottom upwards. This allows the powdered vanadium-containing steel slag and sodium salt at the bottom to flow to the top, while the powdered vanadium-containing steel slag and sodium salt at the top can flow to the bottom. This further promotes the uniformity of heating of the powdered vanadium-containing steel slag and sodium salt, making the reaction more complete and improving the efficiency of the reaction to form sodium metavanadate. It also avoids the phenomenon of caking caused by uneven temperature, thus reducing the number of shutdowns for cleaning, further improving the quality and efficiency of vanadium extraction, shortening the vanadium extraction time, and saving resources.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, the top of the vanadium extraction tank 1 is fixedly connected to an injection mechanism 9 (the gas is clean air or oxygen) for injecting gas into the powdered vanadium-containing steel slag and sodium salt. The injection mechanism 9 includes an air pump 91 fixedly connected to the top of the vanadium extraction tank 1. The air pump 91 is controlled by a controller. The top of the air pump 91 is fixedly connected to a suction pipe 92, and the bottom of the air pump 91 is fixedly connected to an injection pipe 93. A gas guide ring 94 is fixedly connected to the inner surface of the vanadium extraction tank 1. A rotating shaft 72 passes through the gas guide ring 94 and connects to the gas guide ring 94. The ring 94 is sealed and rotated. The air injection pipe 93 is fixedly connected to the air guide ring 94. A connecting air passage 96 is opened inside the rotating shaft 72. An air inlet 95 is opened on the side wall of the rotating shaft 72 at the top of the connecting air passage 96. The air inlet 95 is located inside the air guide ring 94. An exhaust air passage 97 is opened inside the material distribution roller 73. The exhaust air passage 97 is connected to the inside of the connecting air passage 96. A material distribution air hole 98 is opened on the material distribution roller 73 and is connected to the inside of the exhaust air passage 97. The material distribution air hole 98 is located inside the material distribution hook 75.

[0026] When there is a sufficient amount of powdered vanadium-containing steel slag and sodium salt at the top of the heating hopper 6, the air pump 91 is started, which draws clean air or oxygen through the air extraction pipe 92. The drawn clean air or oxygen is then injected into the air guide ring 94 through the air injection pipe 93, and then enters the connecting air passage 96 through the air inlet 95. After that, it enters the exhaust air passage 97, and finally is discharged through the material dispersing air hole 98. This achieves the uniform injection of air into the powdered vanadium-containing steel slag and sodium salt, allowing the air to contact the powdered vanadium-containing steel slag and sodium salt in various parts, thus improving the treatment of the powdered vanadium-containing steel slag and sodium salt. On the other hand, during the injection process, the bulk material vent 98 can blow the powdered vanadium-containing steel slag and sodium salt near the rotating shaft 72 to the outside, while the powdered vanadium-containing steel slag and sodium salt located on the outside can flow inward, changing the position of the powdered vanadium-containing steel slag and sodium salt in the heating hopper 6. This further improves the fluidity and heating uniformity of the powdered vanadium-containing steel slag and sodium salt, avoids the agglomeration of the powdered vanadium-containing steel slag and sodium salt, and makes the reaction of the powdered vanadium-containing steel slag and sodium salt more complete, improving the efficiency of the reaction of vanadium-containing steel slag and sodium salt to produce sodium metavanadate, thereby shortening the vanadium extraction time and saving resources.

[0027] like Figure 2 , Figure 5 , Figure 4 and Figure 8 As shown, a uniform material distribution mechanism 10 for uniformly releasing powdered vanadium-containing steel slag and sodium salt into the heating hopper 6 is fixedly connected to the outer surface of the bulk material distribution mechanism 7. The uniform material distribution mechanism 10 includes a uniform material distribution hopper 101 fixedly connected to the outer surface of the rotating shaft 72, and a uniform material distribution hole 102 is provided on the uniform material distribution hopper 101.

[0028] When powdered vanadium-containing steel slag and sodium salt are added through the feeding hopper 2, the rotation of the rotating shaft 72 will drive the uniform feeding hopper 101 to rotate. This causes the uniform feeding hopper 101 to evenly release the powdered vanadium-containing steel slag and sodium salt onto the top of the heating hopper 6 through the uniform feeding hole 102. This avoids the accumulation of powdered vanadium-containing steel slag and sodium salt on the top of the heating hopper 6, which would cause uneven heating of the powdered vanadium-containing steel slag and sodium salt, affecting the quality and efficiency of vanadium extraction from the vanadium-containing steel slag. This shortens the vanadium extraction time and saves resources.

[0029] A method for extracting vanadium from vanadium-containing steel slag includes the following steps: Step 1: Start the electric heating plate 5 and detect the internal temperature of the vanadium extraction tank 1 through the temperature sensor 11. When the internal temperature reaches 750℃ or above, close the electric valve in the discharge pipe 3 and open the electric valve in the feeding hopper 2. Add powdered vanadium-containing steel slag and sodium salt into the vanadium extraction tank 1 through the feeding hopper 2. Start the servo motor 71 when adding. Step 2: When adding powdered vanadium-containing steel slag and sodium salt through the feeding hopper 2, the rotation of the rotating shaft 72 will drive the uniform feeding hopper 101 to rotate. This causes the uniform feeding hopper 101 to evenly release the powdered vanadium-containing steel slag and sodium salt onto the top of the heating hopper 6 through the uniform feeding hole 102. This avoids the accumulation of powdered vanadium-containing steel slag and sodium salt on the top of the heating hopper 6, which would cause uneven heating of the powdered vanadium-containing steel slag and sodium salt, affecting the quality and efficiency of vanadium extraction from the vanadium-containing steel slag. This allows the powdered vanadium-containing steel slag and sodium salt to react more fully, improving the efficiency of the reaction to produce sodium metavanadate, thereby improving the efficiency of vanadium extraction from the vanadium-containing steel slag, shortening the vanadium extraction time, and saving resources. Step 3: After adding the material, close the feeding hopper 2 and open the exhaust pipe 4 and the air pump 91; Step 4: The operation of the servo motor 71 will drive the rotating shaft 72 to rotate, which in turn drives the material roller 73 to revolve. The revolve of the material roller 73 will work with the material trough 74 to stir and grind the powdered vanadium-containing steel slag and sodium salt falling on the heating hopper 6, thereby further reducing the particle size of the powdered vanadium-containing steel slag and sodium salt, and increasing the fluidity of the powdered vanadium-containing steel slag and sodium salt. This will make the powdered vanadium-containing steel slag and sodium salt more evenly heated, and make the reaction of the powdered vanadium-containing steel slag and sodium salt more complete, thereby improving the efficiency of the reaction of vanadium-containing steel slag and sodium salt to produce sodium metavanadate. This will improve the efficiency of vanadium extraction from vanadium-containing steel slag, shorten the vanadium extraction time, save resources, and the gas generated during the vanadium extraction process will be discharged into the processing liquid through the exhaust pipe 4, where the processing liquid will absorb the vanadium component gas generated during vanadium extraction. The revolution of the bulk material roller 73 will drive the rotating ring 83 to rotate along the bottom of the fixed ring 81 and the top of the heating hopper 6, thereby causing the gear 84 to move along the bottom of the gear ring 82. During the movement of the gear 84, since the gear 84 meshes with the gear ring 82, the gear 84 will rotate, thereby driving the bulk material roller 73 to rotate. This rotation of the bulk material roller 73 during its revolution further improves the grinding efficiency of the bulk material roller 73 on the powdered vanadium-containing steel slag and sodium salt, accelerates the reduction rate of the particle size of the powdered vanadium-containing steel slag and sodium salt, and further improves the flowability of the powdered vanadium-containing steel slag and sodium salt, making the powdered vanadium-containing steel slag and sodium salt more uniformly heated. At the same time, the rotation of the bulk material roller 73 will drive the bulk material... The rotation of hook 75 causes the bulk material hook 75 to convey the powdered vanadium-containing steel slag and sodium salt at the bottom to the top, allowing the powdered vanadium-containing steel slag and sodium salt at the bottom to flow to the top, and the powdered vanadium-containing steel slag and sodium salt at the top to flow to the bottom. This further promotes the uniformity of heating of the powdered vanadium-containing steel slag and sodium salt, making the reaction of the powdered vanadium-containing steel slag and sodium salt more complete and improving the efficiency of the reaction to produce sodium metavanadate. This improves the efficiency of vanadium extraction from the vanadium-containing steel slag, avoids the phenomenon of agglomeration of powdered vanadium-containing steel slag and sodium salt due to uneven temperature, reduces the number of shutdowns for cleaning, further improves the quality and efficiency of vanadium extraction, shortens the vanadium extraction time, and saves resources. Step 5: Air pump 91 draws clean air or oxygen through suction pipe 92 and injects it into air guide ring 94 through injection pipe 93. Then, it enters connecting air passage 96 through air inlet 95, then into exhaust air passage 97, and finally exits through material dispersing air hole 98. This process achieves two main benefits: firstly, it ensures uniform injection of air into the powdered vanadium-containing steel slag and sodium salt, allowing air to contact all parts of the powdered vanadium-containing steel slag and sodium salt, thus improving the oxidation efficiency. Secondly, when the material dispersing air hole 98 sprays air, it blows the powdered vanadium-containing steel slag and sodium salt near the rotating shaft 72 outwards, while the powdered vanadium-containing steel slag and sodium salt located on the outer side can flow inwards, changing their position within the heating hopper 6, thereby further improving the oxidation efficiency of the powdered vanadium-containing steel slag and sodium salt. The fluidity and uniform heating of the powdered vanadium-containing steel slag and sodium salts allow for a more complete reaction, improving the efficiency of the reaction to form sodium metavanadate. This, in turn, increases the efficiency of vanadium extraction from the vanadium-containing steel slag, preventing clumping of the powdered vanadium-containing steel slag and sodium salts, thus shortening the extraction time and saving resources. Furthermore, the special structure of the bulk roller 73 and its outer surface allows the powdered vanadium-containing steel slag and sodium salts located in the bulk trough 74 and bulk hook 75 to directly contact the gas, improving the oxidation efficiency of the powdered vanadium-containing steel slag and sodium salts. Moreover, the sloping sides of the bulk trough 74 facilitate the downward flow of the powdered vanadium-containing steel slag and sodium salts, and the upward movement of the powdered vanadium-containing steel slag and sodium salts under the action of the gas blown out of the bulk vent 98 facilitates better mixing and heating of the powdered vanadium-containing steel slag and sodium salts. Step 6: After the heating time is reached, turn off the electric heating plate 5 and open the discharge pipe 3 to discharge the residue containing sodium metavanadate obtained after heating; Step 7: Soak the obtained residue containing sodium metavanadate in water or dilute alkaline solution to dissolve the sodium metavanadate inside the residue. After the dissolution time is reached, filter to obtain a solution containing sodium metavanadate. Then, carry out subsequent processing to obtain the final product vanadium pentoxide.

[0030] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A vanadium extraction device for vanadium-containing steel slag, comprising a vanadium extraction tank (1), a feeding hopper (2), a discharge pipe (3), an exhaust pipe (4), an electric heating plate (5), and a heating hopper (6), characterized in that, Also includes: A bulk material dispersing mechanism (7) for dispersing powdered vanadium-containing steel slag and sodium salts, which is fixedly connected to the middle of the vanadium extraction tank (1) and attached to the top of the heating hopper (6); A transmission mechanism (8) is fixedly connected to the inner surface of the vanadium lifting tank (1) for driving the rotation of the bulk material mechanism (7). A gas injection mechanism (9) is fixedly connected to the top of the vanadium extraction tank (1) for injecting gas into powdered vanadium-containing steel slag and sodium salt. A uniform material distribution mechanism (10) is fixedly connected to the outer surface of the bulk material distribution mechanism (7) for uniformly releasing powdered vanadium-containing steel slag and sodium salt into the heating hopper (6).

2. The vanadium extraction device for vanadium-containing steel slag according to claim 1, characterized in that: The bulk material mechanism (7) includes a servo motor (71) fixedly connected to the top center of the vanadium extraction tank (1). The output end of the servo motor (71) is fixedly connected to a rotating shaft (72). The bottom of the rotating shaft (72) is rotatably connected to a bulk material roller (73). A bulk material groove (74) is opened on the outer surface of the bulk material roller (73). A bulk material hook (75) is provided in the bulk material groove (74) and fixedly connected to the outer surface of the bulk material roller (73).

3. The vanadium extraction device for vanadium-containing steel slag according to claim 2, characterized in that: The rotating shaft (72) passes through the vanadium extraction tank (1) and is sealed and rotatably connected to the vanadium extraction tank (1). The outer surfaces of the material roller (73) and the material hook (75) are rough, and the outer diameter of the material hook (75) is slightly larger than the outer diameter of the material roller (73). The outer surfaces of the material roller (73) and the material hook (75) are both left with a gap from the top of the heating bucket (6).

4. The vanadium extraction device for vanadium-containing steel slag according to claim 2, characterized in that: The transmission mechanism (8) includes a fixed ring (81) fixedly connected to the inner surface of the vanadium extraction tank (1), a gear ring (82) fixedly connected to the bottom of the fixed ring (81), a rotating ring (83) rotatably connected to the bottom of the fixed ring (81), and a gear (84) fixedly connected to the end of the material roller (73), the gear (84) meshing with the gear ring (82).

5. A vanadium extraction device for vanadium-containing steel slag according to claim 4, characterized in that: The material roller (73) passes through the rotating ring (83) and is sealed and rotatably connected to the rotating ring (83). The bottom of the rotating ring (83) is sealed and rotatably connected to the top of the heating bucket (6).

6. A vanadium extraction device for vanadium-containing steel slag according to claim 2, characterized in that: The gas injection mechanism (9) includes a gas pump (91) fixedly connected to the top of the vanadium extraction tank (1). The top of the gas pump (91) is fixedly connected to a suction pipe (92), and the bottom of the gas pump (91) is fixedly connected to a gas injection pipe (93). A gas guide ring (94) is fixedly connected to the inner surface of the vanadium extraction tank (1). The gas injection pipe (93) is fixedly connected to the gas guide ring (94). A connecting air passage (96) is opened in the rotating shaft (72). An air inlet (95) is opened on the side wall of the rotating shaft (72) at the top of the connecting air passage (96). The air inlet (95) is located in the gas guide ring (94). An exhaust air passage (97) is opened in the material distribution roller (73). The exhaust air passage (97) is connected to the interior of the connecting air passage (96). A material distribution air hole (98) is opened on the material distribution roller (73) and is connected to the interior of the exhaust air passage (97).

7. A vanadium extraction device for vanadium-containing steel slag according to claim 6, characterized in that: The rotating shaft (72) passes through the air guide ring (94) and is sealed and rotatably connected to the air guide ring (94). The bulk material air hole (98) is located inside the bulk material hook (75).

8. A vanadium extraction device for vanadium-containing steel slag according to claim 2, characterized in that: The material leveling mechanism (10) includes a material leveling hopper (101) fixedly connected to the outer surface of the rotating shaft (72), and the material leveling hopper (101) is provided with a material leveling hole (102).

9. A vanadium extraction device for vanadium-containing steel slag according to claim 1, characterized in that: The feeding hopper (2) is fixedly connected to the top of the vanadium extraction tank (1). The heating hopper (6) is fixedly connected inside the vanadium extraction tank (1) and is funnel-shaped. The bottom of the heating hopper (6) is fixedly connected to the discharge pipe (3). The discharge pipe (3) passes through the vanadium extraction tank (1) and is fixedly connected to the vanadium extraction tank (1). The exhaust pipe (4) is fixedly connected to the top of the vanadium extraction tank (1). The electric heating plate (5) is fixedly connected to the inner surface of the vanadium extraction tank (1) and is located below the heating hopper (6). A temperature sensor (11) is fixedly connected to the inner top of the vanadium extraction tank (1).

10. A method for extracting vanadium from vanadium-containing steel slag, using the vanadium extraction device for vanadium-containing steel slag as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Close the discharge pipe (3), start the electric heating plate (5) and detect the internal temperature of the vanadium extraction tank (1) through the temperature sensor (11), then start the servo motor (71) to make the rotating shaft (72) rotate, and then add powdered vanadium-containing steel slag and sodium salt into the vanadium extraction tank (1) through the feeding hopper (2); Step 2: The powdered vanadium-containing steel slag and sodium salt added to the vanadium extraction tank (1) will fall into the uniform hopper (101) and then into the heating hopper (6) through the uniform hole (102); Step 3: After adding the material, close the feeding hopper (2), and open the exhaust pipe (4) and the air pump (91). Step 4: The rotating shaft (72) will drive the bulk material roller (73) to revolve, and at the same time the bulk material roller (73) will rotate under the action of the transmission mechanism (8) to crush the powdery vanadium-containing steel slag and sodium salt. Step 5: The air pump (91) extracts gas and blows the extracted gas through the bulk material air hole (98) onto the powdered vanadium-containing steel slag and sodium salt; Step 6: After the heating time is reached, turn off the electric heating plate (5) and open the discharge pipe (3) to discharge the residue containing sodium metavanadate obtained after heating; Step 7: Soak the obtained residue containing sodium metavanadate in water or dilute alkaline solution to dissolve the sodium metavanadate inside the residue. After the dissolution time is reached, filter to obtain a solution containing sodium metavanadate. Then, carry out subsequent processing to obtain the final product vanadium pentoxide.

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