High-purity vanadium baking production line

Abstract

The invention provides a high-purity vanadium roasting production line, and belongs to the technical field of high-purity vanadium processing. Comprising a ball pressing device, a water removal rotary kiln, a pyrolysis rotary kiln and a discharging barrel, the water removal rotary kiln, the pyrolysis rotary kiln and the discharging barrel are coaxial, the water removal rotary kiln and the discharging barrel are rotationally connected to the two ends of the pyrolysis rotary kiln respectively, the tail end of the water removal rotary kiln is inserted into the head end of the pyrolysis rotary kiln, and the tail end of the pyrolysis rotary kiln is inserted into the head end of the discharging barrel. An exhaust outer cylinder is rotationally connected outside the dewatering rotary kiln and is communicated with the head end of the pyrolysis rotary kiln, and an exhaust connecting pipe is arranged on one side, close to the head end of the dewatering rotary kiln, of the exhaust outer cylinder; the high-purity vanadium roasting production line further comprises a heating device for heating the pyrolysis rotary kiln, a first driving mechanism for driving the dewatering rotary kiln to rotate and a second driving mechanism for driving the pyrolysis rotary kiln to rotate. The method has the advantages of high efficiency and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-purity vanadium processing and relates to a high-purity vanadium roasting production line. Background Art

[0002] In the prior art, the production process of high-purity vanadium is as follows: Put vanadium pentoxide (defective product) into an electrically heated reaction kettle, add water, heat and stir by electricity. When the water temperature reaches 60 - 80 °C, stop heating, keep stirring at a constant temperature for one hour, filter while it is hot, transfer the filtrate into the reaction kettle, add a small amount of CaCl2 powder, adjust to alkaline with lye, heat and filter, put the filtrate into the vanadium precipitation tank, cool naturally, add an appropriate amount of NH4Cl to precipitate vanadium, and send ammonium metavanadate to the roasting workshop to produce high-purity vanadium. In the roasting workshop, make ammonium metavanadate into balls, load them into a crucible, and then send them into a kiln. Decomposition is achieved at about 135 °C. The decomposition reaction is: NH4VO3 → NH3↑ + H2O↑ + V2O5 (heating and decomposition). Although this method is also continuous processing, the crucible replacement is cumbersome, the material accumulation causes slow and uneven thermal decomposition reaction, the moving speed of the material in the kiln is slow, and the processing efficiency is low. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-purity vanadium roasting production line for the above problems existing in the prior art. The technical problem to be solved by the present invention is how to use a rotary kiln for roasting vanadium to improve the processing efficiency.

[0004] The purpose of the present invention can be achieved by the following technical solutions: A high-purity vanadium roasting production line, characterized in that it includes a briquetting device, a water-removing rotary kiln, a pyrolysis rotary kiln and a discharge cylinder. The water-removing rotary kiln, the pyrolysis rotary kiln and the discharge cylinder are coaxial. The water-removing rotary kiln and the discharge cylinder are respectively rotatably connected to both ends of the pyrolysis rotary kiln. The end of the water-removing rotary kiln is inserted into the head of the pyrolysis rotary kiln, and the end of the pyrolysis rotary kiln is inserted into the head of the discharge cylinder. An exhaust outer cylinder is rotatably connected outside the water-removing rotary kiln. The exhaust outer cylinder is communicated with the head of the pyrolysis rotary kiln, and an exhaust connection pipe is arranged on one side of the exhaust outer cylinder close to the head of the water-removing rotary kiln. The high-purity vanadium roasting production line also includes a heating device for heating the pyrolysis rotary kiln, a driving mechanism one for driving the water-removing rotary kiln to rotate and a driving mechanism two for driving the pyrolysis rotary kiln to rotate.

[0005] Further, the material input from the head of the water-removing rotary kiln is humidified ammonium metavanadate. The humidified ammonium metavanadate material is loaded into a hollow packing ball cage and input from the head of the water-removing rotary kiln.

[0006] Further, the inner wall of the pyrolysis rotary kiln is of a multi-faceted structure.

[0007] Further, the rotation speed of the pyrolysis rotary kiln is greater than that of the water-removing rotary kiln.

[0008] Further, the heating device is electromagnetic heating, including a raw magnetic coil placed outside the pyrolysis rotary kiln and an iron heating core rod located inside the pyrolysis rotary kiln.

[0009] As another option, the heating device is electromagnetic heating, including a raw magnetic coil placed outside the pyrolysis rotary kiln and a hollow iron filling ball cage.

[0010] Further, a rotating shaft is rotatably connected inside the discharge cylinder, and spiral guide vanes adapted to the inner wall of the discharge cylinder are arranged on the rotating shaft.

[0011] Further, as a driving mechanism I of the water removal rotary kiln, the rotating shaft is connected to the iron heating core rod, the iron heating core rod is connected to the inner wall of the water removal rotary kiln, and the rotating shaft is driven by a motor.

[0012] The humidified ammonium metavanadate is filled into a hollow iron filling ball cage with a porous outer wall surface through a briquetting device. During briquetting, the humidified material can be mixed with the hollow iron filling ball cage, and then the hollow iron filling ball cage is driven to roll, so that the surplus material is removed and the material is compacted in the cage. After compaction, it is continuously input from the head end of the water removal rotary kiln. The water removal rotary kiln rotates, and the hollow iron filling ball cage slowly rotates inside the water removal rotary kiln. Inside the water removal rotary kiln, the temperature is controlled at about 80 °C, aiming to solidify the material and remove most of the moisture. The dehydrated material then enters the pyrolysis rotary kiln. Most of the dehydrated material still remains in the state of being filled in the hollow iron filling ball cage. After entering the pyrolysis rotary kiln, the temperature is controlled between 120 - 140 °C. Inside the pyrolysis rotary kiln with a multi-faceted inner wall surface, due to the uneven rolling of the hollow iron filling ball cage, the collision and bump cause the material to scatter from the hollow filling balls. The hollow iron filling ball cage squeezes and crushes the scattered particles, so that after entering the discharge cylinder, ball-powder separation is achieved. The separated hollow iron filling ball cage is guided towards the end of the discharge cylinder under the action of the spiral guide vanes, and finally the powder is discharged at the end of the discharge cylinder, and the filter fraction realizes the recovery of the hollow iron filling ball cage.

[0013] The exhaust connection pipe is located at the head end of the water removal rotary kiln. The hot gas in the pyrolysis rotary kiln can pass through the outside of the water removal rotary kiln, that is, between the exhaust outer cylinder and the water removal rotary kiln, so as to heat the inside of the water removal rotary kiln. The water vapor generated inside the water removal rotary kiln, the ammonia gas generated inside the pyrolysis brick kiln, and the water vapor generated inside the pyrolysis brick kiln are all discharged through the exhaust connection pipe.

[0014] Regarding electromagnetic heating, the alternating magnetic field generated by the raw magnetic coil can generate heat on the iron heating core rod, or the alternating magnetic field generated by the raw magnetic coil can generate heat on the hollow iron filling ball cage. Among these two methods, the former has a central heating position, small heat loss, and low heat preservation difficulty, while the latter directly heats the hollow iron filling ball cage, with a precise heating position and high heat utilization rate.

[0015] Regarding the size of the hollow filled ball cage, its diameter is 100 - 300 mm. The hollow holes can be circular or strip-shaped, and the number of hollow holes is 4 - 12.

[0016] In the traditional vanadium roasting process, after ammonium metavanadate is made into balls, it is loaded into a crucible and passed through a translation kiln cavity. This method has uneven heating and a long heating time. In addition, it needs to be ground after vanadium roasting, and the process is cumbersome. In this solution, it enters the rotary kiln by a rolling feeding method, using the hollow filled ball cage as the outer shell mold of the material, so that it is not easy to adhere to the inner wall of the water removal rotary kiln during the dehydration process. In the pyrolysis stage, the hollow filled ball cage acts as a grinding medium, collides with the vanadium blocks, and the material can be scattered and refined to a certain extent, which is conducive to the rapid progress and uniform heating of the pyrolysis reaction, making the material preliminarily refined and facilitating subsequent powder formation.

[0017] Furthermore, several magnet rings are distributed at intervals on the outer wall of the discharge cylinder.

[0018] Furthermore, the magnet rings are permanent magnets or electromagnets.

[0019] In the pyrolysis rotary kiln, the material has been preliminarily refined, but its main purpose is still for the full heating of the material and the pyrolysis reaction. Before entering the discharge cylinder, there is already material adhesion on the inner and outer walls of the hollow filled ball cage, and the particles of the material are not uniform. After entering the discharge cylinder, the temperature of the material gradually decreases. Under the action of the magnet rings, the iron hollow filled ball cage can be lifted along the inner wall of the discharge cylinder at the position where the magnetic force exists under the action of magnetic adsorption and the pushing of the spiral guide vane. Of course, this lifting is random, some are high and some are low, until it is lifted to the magnetic blank area. When the spiral guide vane drives the hollow filled ball cage to be pushed into the magnetic blank area, due to the disappearance of the magnetic suction force, the hollow filled ball cage falls, and then mutual collisions occur, including the mutual collisions between the hollow filled ball cages, the mutual collisions between the hollow filled ball cage and the material, and also the collisions between the hollow filled ball cage and the spiral guide vane. This kind of collision is the further refinement of the material and the separation of the adhered material inside and outside the hollow filled ball cage, making the hollow filled ball cage relatively clean after discharging and improving the yield.

[0020] The spiral guide vane can reduce the flow rate of the air flow from the end of the discharge cylinder towards the exhaust connection pipe direction, so that part of the air flow comes from the head end of the water removal rotary kiln, ensuring that the water vapor generated in the water removal rotary kiln, the ammonia and water vapor generated in the pyrolysis rotary kiln can be discharged smoothly. Description of the Drawings

[0021] Figure 1 is the structural schematic diagram of the high-purity vanadium roasting production line.

[0022] Figure 2 is Figure 1 the sectional view in the A - A direction in

[0023] Figure 3 It is one of the optional structures of the hollow filler ball cage.

[0024] Figure 4 It is another optional structure of the hollow filler ball cage

[0025] In the figure, 1. water removal rotary kiln; 2. pyrolysis rotary kiln; 3. discharge cylinder; 4. exhaust outer cylinder; 5. exhaust connection pipe; 6. hollow filler ball cage; 7. iron heat-receiving core rod; 8. spiral guiding sheet; 9. magnetic ring; 10. exciting coil. Specific implementation mode

[0026] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0027] As Figure 1 shown in the high-purity vanadium roasting vanadium production line, which includes a briquetting device, a water removal rotary kiln 1, a pyrolysis rotary kiln 2 and a discharge cylinder 3. The water removal rotary kiln 1, the pyrolysis rotary kiln 2 and the discharge cylinder 3 are coaxial. The water removal rotary kiln 1 and the discharge cylinder 3 are respectively rotatably connected to both ends of the pyrolysis rotary kiln 2. The end of the water removal rotary kiln 1 is inserted into the head end of the pyrolysis rotary kiln 2, and the end of the pyrolysis rotary kiln 2 is inserted into the head end of the discharge cylinder 3. An exhaust outer cylinder 4 is rotatably connected outside the water removal rotary kiln 1. The exhaust outer cylinder 4 communicates with the head end of the pyrolysis rotary kiln 2. An exhaust connection pipe 5 is arranged on one side of the exhaust outer cylinder 4 close to the head end of the water removal rotary kiln 1; the high-purity vanadium roasting vanadium production line further includes a heating device for heating the pyrolysis rotary kiln 2, a driving mechanism one for driving the rotation of the water removal rotary kiln 1 and a driving mechanism two for driving the rotation of the pyrolysis rotary kiln 2.

[0028] The material input from the head end of the water removal rotary kiln 1 is humidified ammonium metavanadate. The humidified ammonium metavanadate material is loaded into the hollow filler ball cage 6 and input from the head end of the water removal rotary kiln 1. The inner wall of the pyrolysis rotary kiln 2 is of a multi-edge structure. The rotation speed of the pyrolysis rotary kiln 2 is greater than that of the water removal rotary kiln 1. The rotation speed of the water removal rotary kiln 1 is controlled at 5-30 revolutions per hour, and the rotation speed is relatively slow to avoid the material from scattering. The rotation speed of the pyrolysis rotary kiln 2 can be several times that of the water removal rotary kiln 1 to ensure that the material can be effectively scattered.

[0029] The heating device is electromagnetic heating, including an exciting coil 10 placed outside the pyrolysis rotary kiln 2 and an iron heat-receiving core rod 7 located inside the pyrolysis rotary kiln 2. As another option, the heating device is electromagnetic heating, including an exciting coil 10 placed outside the pyrolysis rotary kiln 2 and an iron hollow filling ball cage.

[0030] A rotating shaft is rotatably connected inside the discharge cylinder 3, and a spiral guiding sheet 8 that is located inside the discharge cylinder 3 and adapted to the inner wall of the discharge cylinder 3 is arranged on the rotating shaft. As the driving mechanism one of the water removal rotary kiln 1, the rotating shaft is connected to the iron heat-receiving core rod 7, the iron heat-receiving core rod 7 is connected to the inner wall of the water removal rotary kiln 1, and the rotating shaft is driven by a motor.

[0031] The humidified ammonium metavanadate is filled into a hollow filling ball cage with a porous outer wall surface through a briquetting device. During briquetting, the humidified material can be mixed with the hollow filling ball cage, and then the hollow filling ball cage is driven to roll, so that the surplus material is removed and the material is compacted in the cage. After compaction, it is continuously fed into the first end of the water removal rotary kiln 1. The water removal rotary kiln 1 rotates, and the hollow filling ball cage slowly rotates in the water removal rotary kiln 1. In the water removal rotary kiln 1, the temperature is controlled at about 80 °C, aiming to solidify the material and remove most of the moisture. The dehydrated material then enters the pyrolysis rotary kiln 2 in sequence. Most of the dehydrated material still remains in the state of being filled in the hollow filling ball cage. After entering the pyrolysis rotary kiln 2, the temperature is controlled between 120 - 140 °C. In the pyrolysis rotary kiln 2 with a multi-faceted inner wall surface, due to the uneven rolling of the hollow filling ball cage, the collision and bump cause the material to scatter from the hollow filling balls. The hollow filling ball cage squeezes and crushes the scattered particles, enabling ball-powder separation after entering the discharge cylinder 3. The separated hollow filling ball cage is guided towards the end of the discharge cylinder 3 under the action of the spiral guide vane 8, and finally the powder is discharged at the end of the discharge cylinder 3, and the filtration realizes the recovery of the hollow filling ball cage.

[0032] The exhaust connection pipe 5 is located at the first end of the water removal rotary kiln 1. The hot gas in the pyrolysis rotary kiln 2 can pass through the outside of the water removal rotary kiln 1, that is, between the exhaust outer cylinder 4 and the water removal rotary kiln 1, and then heat the inside of the water removal rotary kiln 1. The water vapor generated in the water removal rotary kiln 1, the ammonia gas generated in the pyrolysis brick kiln, and the water vapor generated in the pyrolysis brick kiln are all discharged through the exhaust connection pipe 5.

[0033] Regarding electromagnetic heating, the alternating magnetic field generated by the magnetizing coil 10 can generate heat on the iron heating core rod 7, or the alternating magnetic field generated by the magnetizing coil 10 can generate heat on the hollow filling ball cage. Among these two methods, the former has a central heating position, small heat loss, and low heat preservation difficulty, while the latter directly heats the hollow filling ball cage, with a precise heating position and high heat utilization rate.

[0034] Regarding the size of the hollow filling ball cage, its diameter is 100 - 300 mm. The hollow holes can be circular or strip-shaped, and the number of hollow holes is 4 - 12.

[0035] In the traditional vanadium roasting process, after ammonium metavanadate is made into balls, it is loaded into a crucible and passed through a translation kiln cavity. This method has uneven heating and a long heating time. In addition, after vanadium roasting, it is necessary to grind it, and the process is cumbersome. In this solution, a rolling feeding method is adopted to enter the rotary kiln. The hollow filling ball cage is used as the outer shell mold of the material, so that it is not easy to adhere to the inner wall of the dewatering rotary kiln 1 during the dehydration process. In the pyrolysis stage, the hollow filling ball cage acts as a grinding medium and collides with the vanadium blocks, so that the material can be scattered and refined to a certain extent, which is conducive to the rapid progress and uniform heating of the pyrolysis reaction, enabling the material to be preliminarily refined and facilitating subsequent powder formation.

[0036] The outer wall of the discharge cylinder 3 is provided with a number of alternately distributed magnetic rings 9, and the magnetic rings 9 are permanent magnets or electromagnets.

[0037] In the pyrolysis rotary kiln 2, the material has been preliminarily refined. However, its main purpose is still to ensure the full heating of the material and the pyrolysis reaction. Before entering the discharge cylinder 3, there is already material adhesion on the inner and outer walls of the hollow filling ball cage, and the particles of the material are not uniform. After entering the discharge cylinder 3, the temperature of the material gradually decreases. Under the action of the magnetic ring 9, the iron hollow filling ball cage can be lifted along the inner wall of the discharge cylinder 3 at the position where the magnetic force exists under the action of magnetic adsorption and the pushing of the spiral guide vane 8. Of course, this kind of lifting is random, some are high and some are low, until it is lifted to the magnetic blank area. When the spiral guide vane 8 drives the hollow filling ball cage to be pushed to the magnetic blank area, due to the disappearance of the magnetic attraction, the hollow filling ball cage falls, and then mutual collisions are realized, including the mutual collisions between the hollow filling ball cages, the mutual collisions between the hollow filling ball cage and the material, and also the collisions between the hollow filling ball cage and the spiral guide vane 8. This kind of collision is the further refinement of the material and also the separation of the adhered material inside and outside the hollow filling ball cage, making the hollow filling ball cage relatively clean after discharging and improving the yield.

[0038] The spiral guide vane 8 can reduce the flow rate of the air flow from the end of the discharge cylinder 3 in the direction of the exhaust connection pipe 5, so that part of the air flow comes from the head end of the dewatering rotary kiln 1, ensuring that the water vapor generated in the dewatering rotary kiln 1, the ammonia gas and water vapor generated in the pyrolysis rotary kiln 2 can be smoothly discharged.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A high-purity vanadium roasting vanadium production line, characterized in that, It includes a briquetting device, a water-removing rotary kiln (1), a pyrolysis rotary kiln (2) and a discharge cylinder (3). The water-removing rotary kiln (1), the pyrolysis rotary kiln (2) and the discharge cylinder (3) are coaxial. The water-removing rotary kiln (1) and the discharge cylinder (3) are respectively rotatably connected to both ends of the pyrolysis rotary kiln (2). The end of the water-removing rotary kiln (1) is inserted into the head end of the pyrolysis rotary kiln (2), and the end of the pyrolysis rotary kiln (2) is inserted into the head end of the discharge cylinder (3). An exhaust outer cylinder (4) is rotatably connected outside the water-removing rotary kiln (1). The exhaust outer cylinder (4) communicates with the head end of the pyrolysis rotary kiln (2), and an exhaust connection pipe (5) is arranged on one side of the exhaust outer cylinder (4) close to the head end of the water-removing rotary kiln (1). The high-purity vanadium roasting vanadium production line further includes a heating device for heating the pyrolysis rotary kiln (2), a driving mechanism I for driving the rotation of the water-removing rotary kiln (1), and a driving mechanism II for driving the rotation of the pyrolysis rotary kiln (2).

2. The high-purity vanadium roasting vanadium production line according to claim 1, wherein, The material input from the head end of the water-removing rotary kiln (1) is humidified ammonium metavanadate. The humidified ammonium metavanadate material is loaded into the hollow filler ball cage (6) and input from the head end of the water-removing rotary kiln (1).

3. The high-purity vanadium roasting vanadium production line according to claim 2, characterized in that, The inner wall of the pyrolysis rotary kiln (2) is of a multi-edge structure.

4. The high-purity vanadium roasting vanadium production line according to claim 2, characterized in that, The rotational speed of the pyrolysis rotary kiln (2) is greater than that of the water-removing rotary kiln (1).

5. A high-purity vanadium roasting vanadium production line according to any one of claims 1-4, characterized in that, The heating device is electromagnetic heating, including a magnetizing coil (10) placed outside the pyrolysis rotary kiln (2) and an iron heat-receiving core rod (7) located inside the pyrolysis rotary kiln (2).

6. The high-purity vanadium roasting vanadium production line according to any one of claims 1-4, characterized in that, The heating device is electromagnetic heating, including a magnetizing coil (10) placed outside the pyrolysis rotary kiln (2) and an iron hollow filler ball cage.

7. A high-purity vanadium roasting vanadium production line according to any one of claims 1-4, characterized in that, A rotating shaft is rotatably connected inside the discharge cylinder (3), and spiral guiding blades (8) located inside the discharge cylinder (3) and adapted to the inner wall of the discharge cylinder (3) are arranged on the rotating shaft.

8. The high-purity vanadium roasting vanadium production line according to claim 7, characterized in that, As the driving mechanism I of the water-removing rotary kiln (1), the rotating shaft is connected to the iron heat-receiving core rod (7), the iron heat-receiving core rod (7) is connected to the inner wall of the water-removing rotary kiln (1), and the rotating shaft is driven by a motor.

9. The high-purity vanadium roasting vanadium production line according to claim 7, wherein, Several magnetic rings (9) are distributed at intervals on the outer wall of the discharge cylinder (3).

10. The high-purity vanadium roasting vanadium production line according to claim 7, wherein, The magnetic ring (9) is a permanent magnet or an electromagnet.

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