CN111850292B

CN111850292B - Vanadium slag pellet preparation system and preparation method

Info

Publication number: CN111850292B
Application number: CN202010737620.9A
Authority: CN
Inventors: 吴封; 汪超
Original assignee: Pangang Group Vanadium Titanium & Resources Co ltd
Current assignee: Pangang Group Vanadium Titanium & Resources Co ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2022-05-31
Anticipated expiration: 2040-07-28
Also published as: CN111850292A

Abstract

The invention discloses a vanadium slag pellet preparation system and a vanadium slag pellet preparation method, relates to the technical field of metallurgy, and aims to provide a device and a method capable of improving the pelletizing rate of pellets. The technical scheme adopted by the invention is as follows: vanadium slag pelletizing preparation system, including binder preparation facilities, compounding device, pressure ball device, distributing device and drying device, binder preparation facilities links to each other and provides the binder to the compounding device with the compounding device, and the feed opening of compounding device is connected and is pressed the ball device, presses the ball material export of ball device to link up with the distributing device, and the discharge end of distributing device sets up drying device. The preparation method of the vanadium slag pellets comprises the steps of firstly preparing a binder from humic acid, flake caustic soda and water through a binder preparation device, then preparing a mixture from vanadium slag, soda ash and the binder through a mixing device, preparing vanadium slag pellets through a pellet pressing device, distributing the vanadium slag pellets through a distributing device, and finally drying the vanadium slag pellets through a drying device to obtain the qualified vanadium slag pellets.

Description

Vanadium slag pellet preparation system and preparation method

Technical Field

The invention relates to the technical field of metallurgy, in particular to a vanadium slag pellet preparation technology.

Background

Since the beginning of the research on the vanadium slag sodium-modified pellet roasting vanadium extraction industrialization technology in 12 months in 2015, the steel production group has performed five times of large production tests to obtain various parameters which are crucial, but the material preparation of each production test becomes the longest time and the largest workload link in the whole test.

Before 3 months in 2019, the preparation technology of vanadium slag pellets adopted by the Panzhihua group is as follows: fully mixing vanadium slag (-more than or equal to 80 mesh and MFe less than or equal to 5%) with sodium carbonate (1000: 280) (by mass) to obtain a material, and conveying the material above a disc granulator through a screw; the caustic soda solution was adjusted to a NaOH content of 10% by mass and then transferred to the upper part of the disk pelletizer by a pump. The material is brought to the upper part along with the rotation of the disc granulator and then falls to the bottom along the disc bottom, and simultaneously, the material gradually forms particles in the process of falling along with the rotation of the disc due to the addition of the atomized NaOH solution. Along with the time, the particles gradually increase, the particles reaching the specification float above the inclined disc, and are thrown out along the tangential direction of the disc along with the rotation of the disc and enter a discharging port of the granulator. After primary screening, the vanadium slag pellets are conveyed to the feeding end of a dryer through an inclined belt, and are dried in the dryer to form qualified pellets with H2O being less than or equal to 1%, and the qualified pellets are packaged and stored for later use after being cooled.

The vanadium slag pellets produced by the disc granulator have poor particle uniformity for several reasons. Firstly, the granularity of vanadium slag is-120 meshes and is more than or equal to 80%, about 20% of vanadium slag with the granularity of +20 to-120 meshes still exists, the finer the granularity is, the more easily the vanadium slag is pelletized, and the larger the granularity of the pelletized material with the fine granularity is under the same condition; conversely, the material with coarse particle size is smaller in the particle size of the ball. Secondly, the vanadium slag contains about 5 percent of metallic iron, and the metallic iron powder is difficult to be pelletized compared with pure vanadium slag. Thirdly, the probability of the vanadium slag contacting with the water on the disc is different, and the vanadium slag with high water content can be quickly formed into balls and has large particles.

The dead material layer and the scraper in close contact with of disc bottom, and the soda that the dead material layer contains is expanded fast after absorbing water, and the disc running time has been long, and the scraper increases with the resistance that dies the bed of material, causes the scraper to warp or the scraper motor burns out, the speed reducer draws the trouble to forced shut down to overhaul or clear up the dead bed of material of disc, can not realize continuous stable production.

The granulating material contains soda ash, NaOH aqueous solution is added before the granulating material enters the disc, the granulating material is easy to agglomerate and harden, so that the granulating material entering the disc is dry powder, and the environment of a granulating site is poor. The NaOH aqueous solution is sprayed on the disc in a mist form, and the tiny liquid is diffused around the disc, so that the field environment is poor.

In the vanadium slag granulation process, a material core is formed firstly after a granulation material is contacted with a NaOH aqueous solution, the material core is adhered and contacted with powder or the material core in the rolling process of the material core in a disc to grow into a material ball gradually, if the water content of the material core is low, the powder adhering capacity of the material core is poor, a qualified material ball cannot be formed, and the balling rate of the disc granulation is low. If the core has high water content, the strength of the pellet is low. Through groping, the mass water content of the pellet granulated by the vanadium slag is 12-15%, the water content is higher, the pellet is soft and fragile due to high water content of the pellet of the vanadium slag, the pellet is easy to break in the feeding process, the pelletizing rate is low, and the pelletizing rate in production is only about 60%.

The vanadium slag pellets are conveyed to a distributing device at the feeding end of the dryer through an inclined-angle belt, and in the process that the vanadium slag pellets are dispersed on a mesh belt of the dryer through the distributing device, the vanadium slag pellets are in hard contact with the vanadium slag pellets, and then the pellet strength is poor, the vanadium slag pellets are seriously broken, so that the pelletizing rate of the vanadium slag pellets is further reduced. The mass water content of the slag ball pellets is 12-15%, and after the slag ball pellets enter a dryer, the slag ball pellets cannot be heated quickly to remove moisture of the pellets, because the moisture in the pellets is quickly vaporized and transferred to the surface of the slag ball pellets after the temperature of the slag ball pellets is higher than 100 ℃, water vapor cannot be taken away immediately, the moisture is aggregated on the surface of the slag ball pellets to soften and collapse the pellets, and the pelletizing rate of the slag ball pellets is seriously affected. Therefore, the existing drying mode is directly carried out in the atmosphere with the temperature higher than 100 ℃, and the drying mode is also an important factor for reducing the pelletizing rate of the slag ball pellets.

Disclosure of Invention

The invention aims to provide a vanadium slag pellet preparation device which can quickly dry pellets and improve the pelletizing rate of the pellets.

The technical scheme adopted by the invention for solving the technical problems is as follows: the vanadium slag pellet preparation system comprises a binder preparation device, a mixing device, a ball pressing device, a distributing device and a drying device, wherein the binder preparation device is connected with the mixing device through a pipeline and provides a binder for the mixing device; the drying device comprises a drying box, wherein an annular and rotatably movable mesh belt is arranged in the drying box, an air outlet valve is arranged at the top of the drying box, an air inlet valve is arranged at the bottom or below the side surface of the drying box, a material collecting hopper is arranged at the bottom of the drying box, and a fine powder valve is arranged at the bottom of the material collecting hopper; the stoving case is last to set up the feed inlet that links up with the discharge end of distributing device, and the below of feed inlet is the feed end of guipure, and the discharge end of guipure links up second check mesh screen, and the oversize of second check mesh screen links up with the discharge gate of stoving case.

Further, the method comprises the following steps: the discharge end downside of drying device's guipure sets up a flitch, and the downside of a flitch is second check mesh screen, and a flitch and the slope of second graticule mesh screen set up and the slope opposite direction.

Further, the method comprises the following steps: the air outlet valves are arranged at the positions, close to the feeding end of the mesh belt, of the drying box at equal intervals, and the air inlet valves are arranged at the positions, far away from the feeding end of the mesh belt, of the drying box at equal intervals; drying bottom of the case portion equidistant sets up a plurality of conical collecting hoppers, also sets up conical collecting hopper under the sieve of second check mesh screen, and the below of each collecting hopper all is connected to the pressure ball device through conveyor.

Further, the method comprises the following steps: the binder preparation device comprises a binder tank and a high-level tank, wherein the binder tank is provided with a steam pipe and a water inlet pipe, the steam pipe and the water inlet pipe are respectively provided with a first steam valve and a water inlet valve, a first stirrer is arranged in the binder tank, the binder tank is provided with an opening which can be opened and closed, the outlet of the binder tank is connected to the high-level tank through a pipeline, and the pipeline is provided with a first discharge valve; the high-level tank is provided with a steam pipe, a second steam valve is arranged on the steam pipe, a second stirrer is arranged in the high-level tank, the bottom of the high-level tank is connected with a discharging pipe, the discharging pipe is connected with a mixing device, and a second discharging valve is arranged on the discharging pipe.

Further, the method comprises the following steps: the binder tanks are of two sets, and the discharge ends of the first discharge valves of the two binder tanks are converged and then connected with the high-level tank.

Further, the method comprises the following steps: the bottom of the adhesive tank is provided with a slope, and the bottom of the slope is provided with a dredging opening; blades are arranged at the tail ends of the first stirrer and the second stirrer, a steam drum is arranged at the tail end of the steam pipe, and a small hole is formed in the upper part of the steam pipe; the pipeline between the first discharge valve of the binder tank and the high-level tank is provided with a power pump, the binder tank and the high-level tank are respectively provided with a liquid level meter and a thermometer, and the discharge pipe of the high-level tank is also provided with a flowmeter.

The vanadium slag pellet preparation system has the beneficial effects that: after the vanadium slag pellets enter the drying box, the vanadium slag pellets are driven by the mesh belt to move from the feeding end to the discharging end along with the mesh belt for drying, different temperature zones can be formed between the feeding port and the discharging port of the drying box, the vanadium slag pellets can be dried at different temperatures when moving to different positions, the drying process can be controlled, and the pelletizing rate is improved. The collecting hopper is used for collecting a small amount of fine powder generated in the drying and screening process of the second grid mesh screen, and the fine powder can return to the ball pressing device to be used for preparing vanadium slag balls. The vanadium slag pellet preparation system is convenient for adjusting the running speed of equipment, simple to operate, low in labor intensity, environment-friendly, small in occupied area, large in productivity and stable and reliable in pellet quality.

And a material folding plate is arranged at the lower side of the discharge end of the mesh belt of the drying device and used for guiding the falling vanadium slag balls, so that the vanadium slag balls are all dropped on the second mesh screen. The binder preparation device comprises a binder tank and a high-level tank, and the high-level tank is used for caching the prepared binder, so that continuous production is guaranteed. The binder tanks are two sets of the same, one set is used for standby, and the binder tanks can also be used alternately.

The invention also provides a preparation method of the vanadium slag pellet, which adopts the technical scheme that: the vanadium slag pellet preparation method for producing vanadium slag pellets by any one of the vanadium slag pellet preparation systems comprises the following steps:

s1, preparing a binder from humic acid, flake caustic and water through a binder preparation device;

s2, preparing the vanadium slag, the soda ash and the binder prepared in the S1 into a mixture through a mixing device;

s3, preparing the mixture prepared in the S2 through a ball pressing device to obtain vanadium slag balls;

s4, distributing the vanadium slag balls prepared in the step S3 on a mesh belt of a drying device through a material distribution device;

and S5, drying the vanadium slag pellets by using a drying device to obtain qualified vanadium slag pellets.

In step S1, the binder was prepared by mixing 750kg of humic acid, 250kg of caustic soda flakes and 4.250m of water³Adding water into a binder tank and stirring, then adding caustic soda flakes and stirring, adding humic acid after the caustic soda flakes are fully dissolved, enabling the liquid temperature to be more than or equal to 85 ℃ through steam, and fully decocting to obtain the binder.

In the step S2, the sodium carbonate and the vanadium slag are mixed according to the molar ratio of sodium element of the sodium carbonate to vanadium element in the vanadium slag of 3.1-3.5 to obtain a primary mixed material, and then 0.05-0.10 m is added into 1 ton of the primary mixed material³Spraying the binder in the proportion of the binder, and preparing a mixture by a mixing device.

In the step S5, a drying box of the drying device is divided into 14 areas from a feeding hole to a discharging hole, wherein the 14 areas are a 1 st temperature area and a 2 nd temperature area … …, the 14 th temperature area is sequentially arranged, the 1 st temperature area is 70-80 ℃, the 2 nd temperature area is 75-90 ℃, the 3 rd temperature area is 85-95 ℃, the 4 th temperature area to the 6 th temperature area are gradually increased from 105 ℃ to 250 ℃, the temperature of the 7 th temperature area to the 10 th temperature area is stabilized at 260-300 ℃, and the temperature of the 11 th temperature area to the 14 th temperature area is gradually reduced to 100 ℃; the retention time of the vanadium slag pellets in the drying box is 45-60 min, and the water content of the vanadium slag pellets is less than or equal to 1%.

The preparation method of the vanadium slag pellet has the beneficial effects that: through the preparation method of the vanadium slag pellets, the prepared vanadium slag pellets have uniform particles, the comprehensive pelletizing rate is 95%, the moisture content of the vanadium slag pellets prepared by the pellet pressing device is less than or equal to 8% (by mass), the moisture content of the vanadium slag pellets obtained after drying is less than or equal to 1% (by mass), and the vanadium slag pellets have uniform components, are environment-friendly in production and are suitable for large-scale production.

Drawings

FIG. 1 is a schematic diagram of a preparation device of a caking agent in an embodiment of a vanadium slag pellet preparation system.

Fig. 2 is a schematic diagram of a material distribution device and a drying device in an embodiment of the vanadium slag pellet preparation system.

Fig. 3 is a schematic diagram of a material mixing device and a pellet pressing device in an embodiment of the vanadium slag pellet preparation system.

Reference numerals are as follows: the device comprises a first steam valve 1, a water inlet valve 2, a first stirrer 3, a binder tank 4, an opening 5, a first liquid level meter 6, a first thermometer 7, a slope 8, a desilting port 9, a first liquid outlet valve 10, a power pump 11, a second steam valve 12, a second stirrer 13, an access port 14, a high-level tank 15, a second liquid level meter 16, a second thermometer 17, a flowmeter 18 and a second discharge valve 19; the device comprises a nozzle 20, a movable turning plate 21, a material distributing hopper 22, a chute 23, a roller mixer 24, a material raising plate 25, a buffer bin 26, a discharge valve 27, a material loosening device 28, a mixture discharge valve 29, opposite spirals 30 and a discharge opening 31; the device comprises a first hopper 32, a feeding machine 33, a second hopper 34, a first compression roller 35, a first edge trimmer 36, a second compression roller 37, a third hopper 38, an edge trimmer 39, a first grid mesh screen 40, a first inclination belt 41, a fine powder bin 42, a bin 43, a fourth hopper 44, a first hopper baffle plate 45, a fifth hopper 46, a second hopper baffle plate 47, a second Saiban 48, a second inclination belt 49, a first shaft 50, a second shaft 51, a rotary disc 52, a connecting rod 53, a third shaft 54, a second buffer bin 55, a distribution pipe 56, a step trough 57, a mesh belt 58, a drying box 59, an air outlet valve 60, an air inlet valve 61, a fine powder valve 62, a material folding plate 63 and a second grid mesh screen 64.

Detailed Description

The invention will be further explained with reference to the drawings.

The vanadium slag pellet preparation system comprises a binder preparation device, a mixing device, a pellet pressing device, a material distribution device and a drying device. The agent preparation device is used for preparing the adhesive, and the adhesive preparation device is connected with the mixing device through a pipeline and supplies the adhesive to the mixing device. The mixing device is used for preparing a mixture, the binder is one of raw materials for preparing the mixture, and a feed opening of the mixing device is connected with the ball pressing device. The ball pressing device is used for preparing the mixture into vanadium slag balls, and a ball material outlet of the ball pressing device is connected with the material distribution device. The discharging end of the distributing device is provided with a drying device, the distributing device is used for distributing the vanadium slag pellets on a mesh belt of the drying device for drying, and the qualified vanadium slag pellets are obtained after the vanadium slag pellets are dried by the drying device.

As shown in figure 1, the binder preparation device comprises a binder tank 4 and a high-level tank 15, wherein the binder tank 4 is used for directly manufacturing the binder, and the high-level tank is used for buffering the binder, so that continuous and smooth production of downstream processes is ensured. The binder tank 4 is provided with a steam pipe and a water inlet pipe, the steam pipe and the water inlet pipe are respectively provided with a first steam valve 1 and a water inlet valve 2, the tail end of the steam pipe is provided with a steam drum, the upper part of the steam pipe is provided with a large number of small holes, the diameter of each small hole is generally 3mm, the contact between steam and liquid is increased, and therefore the full utilization of heat energy is facilitated. The first stirrer 3 is arranged in the binder tank 4, and the end of the first stirrer 3 is provided with a blade. The adhesive tank 4 is provided with an opening 5 which can be opened and closed, a cover plate is arranged at the opening 5, the opening 5 is preferably arranged at the top of the adhesive tank 4, and the opening 5 has the following functions: service access, inspection ports during production, and also the entry of materials, such as caustic soda flakes, into the binder tank 4. A liquid level gauge and a temperature gauge are also provided in the adhesive tank 4, and a first liquid level gauge 6 and a first temperature gauge 7 are provided in the adhesive tank 4 as described in fig. 1. In order to facilitate the removal of the deposit at the bottom of the adhesive tank 4, the bottom of the adhesive tank 4 is inclined or funnel-shaped, and for example, as shown in fig. 1, the bottom of the adhesive tank 4 is provided with a slope 8, while a dredging port 9 is provided at the bottom, i.e., the lowermost position, of the slope 8, and a dredging valve is provided at the dredging port 9. An outlet is arranged at the bottom of the adhesive tank 4 or a position close to the bottom, the outlet of the adhesive tank 4 is connected to a high-level tank 15 through a pipeline, and a first discharging valve 10 is arranged on the pipeline. The adhesive tank 4 and the high-level tank 15 may be self-flowing or pumped, for example, as shown in fig. 1, and a power pump 11 is provided on a pipe between the adhesive tank 4 and the high-level tank 15. Since it takes a certain time for the adhesive tank 4 to prepare the adhesive, in order to shorten the time interval for supplying the adhesive to the upper tank 15, the adhesive tank 4 and its associated facilities are plural sets and the outlets thereof are connected to the upper tank 15, respectively. For example, as shown in fig. 1, the adhesive tank 4 and its associated facilities are used in two sets alternately. The high-level tank 15 is provided with a steam pipe, and the steam pipe is provided with a second steam valve 12 for maintaining the temperature of the adhesive. The steam pipe of the high-level tank 15 has a structure identical to that of the steam pipe of the binder tank 4. A second stirrer 13 is arranged in the high-level tank 15, and a blade is arranged at the tail end of the second stirrer 13. A second liquid level gauge 16 and a second temperature gauge 17 are respectively arranged in the high-level tank 15. The bottom of the high-level tank 15 is preferably funnel-shaped, the bottom of the high-level tank 15 is connected with a discharge pipe, the discharge pipe is connected with a mixing device, and a flow meter 18 and a second discharge valve 19 are arranged on the discharge pipe.

The raw materials of the binding agent are humic acid, flake caustic soda and water, and the raw materials are mixed according to a certain proportion and then decocted to obtain the binding agent. Preparing the binder, opening a water inlet valve 2 on a water inlet pipe, adding water at normal temperature or certain temperature into a binder tank 4, closing the water inlet valve 2 after reaching a certain liquid level, starting a first stirrer 3, and adding weighed flake caustic soda from an opening 5. The temperature of the water does not exceed the maximum water temperature, which is the water temperature when the liquid is boiled under stirring and splashes. The first stirrer 3 is kept in an open state, after the flake caustic soda is fully dissolved, the weighed humic acid is added, the first steam valve 1 on the steam pipe is opened to ensure that the liquid temperature is more than or equal to 85 ℃, and the binder is fully decocted. For example, the ratio of humic acid, caustic soda flakes and water is 750kg of humic acid, 250kg of caustic soda flakes and 4.250m of water³And decocting in a binder tank 4 for 4 hours. Preparation of BindersAfter the completion, the first discharge valve 10 is opened, and the decocted binder is injected into the high-level tank 15.

The mixing device and the ball pressing device are shown in figure 3, a second liquid outlet valve 19 is opened, and the binder is sprayed on the surface of the mixture of the vanadium slag and the soda ash through a nozzle 20; the flow meter 18 measures the flow of the binder, when the single flow reaches a set value, the second liquid outlet valve 19 is closed, and when the binder needs to be sprayed on the next primary mixed material (the mixture of vanadium slag and soda ash), the second liquid outlet valve 19 is opened. The second liquid outlet valve 19 and the movable turning plate 21 are controlled in an interlocking manner, after the turning action of the movable turning plate 21 is finished, the second liquid outlet valve 19 is opened, and the movable turning plate 21 finishes spraying the adhesive in the batch before turning action of the movable turning plate 21 next time. Mixing soda ash and vanadium slag according to the molar ratio of sodium element of soda ash to vanadium element in vanadium slag of 3.1-3.5 to obtain a primary mixed material, and adding 0.05-0.10 m into 1 ton of the primary mixed material ³Spraying the binder in the proportion of the binder, and preparing a mixture by a mixing device. For example, the molar ratio of sodium element of soda ash to vanadium element in vanadium slag is 3.3, and 0.08m is sprayed on 1 ton of mixed material³And (4) preparing the decocted binder.

Specifically, referring to the upper half of fig. 3, the sub-hopper 22 of the mixing device is a rectangular box with a length of 300mm, a width of 200mm and a height of 400mm, and the sub-hopper 22 is provided with a feed opening for adding the initial mixture. The inside of the material distribution hopper 22 is provided with a movable turning plate 21, the movable turning plate 21 is a square plate with the side length of 300mm, the formed inclination angle is 60 degrees, and the movable turning plate 21 is connected with the center of the bottom of the material distribution hopper 22 through a hinge. The power for turning the movable turning plate 21 comes from a piston, and the movable turning plate 21 is controlled to turn back and forth through time setting, for example, the movable turning plate 21 operates once every 6 min. The lower part of the distributing hopper 22 is closed and connected with a chute 23, the inclination angle of the chute 23 is 60 degrees, and the pipe diameter is DN200 mm. The mixture formed by the vanadium slag, the soda ash and the binding agent enters a roller mixer 24 through a chute 23. The chute 23 is provided with rapping means to avoid material build-up on the chute 23 which would cause the material to run unsmooth, e.g. rapping once every 12 min. The specific parameters correspond to each other, and according to the productivity of 10t/h of the mixture, the diameter of a roller of the roller mixer 24 is 1.5m, and the length of the roller is 1.0 m. Set up the lifting blade 25 in the cylinder blender 24, the lifting blade 25 is wide 0.22m, thick 6 mm's long steel strip, the welding is on the inner wall of cylinder blender 24, and same lifting blade 25 comprises two billets, and the inclination that two billets formed is 10, and adjacent lifting blade 25's inclination opposite direction, the inclination summit of lifting blade 25 is located the center of 24 barrels of cylinder blender along the material walking direction, does benefit to and guarantees that the compounding is even. The speed of the mixing operation of the drum mixer 24 was set to 10 r/min. The material not only follows cylinder running direction compounding in cylinder blender 24, still combines the continuous dispersion of barrel direction, draws in and carries out the compounding in order to guarantee cylinder blender 24's the material intensive mixing even, in order to satisfy the granulation needs of later step (the effect that lifting blade 25 has the inclination). After the drum mixer 24 operates for 5min, the rotating speed of the drum mixer 24 is reduced to 2r/min, when the discharge valve 27 enters the lower part of the drum mixer 24 from the upper part of the drum mixer, the drum mixer is positioned in the buffer bin 26, the discharge valve 27 is opened, and the materials in the drum mixer 24 are discharged into the buffer bin 26; when the discharge valve 27 enters the upper portion of the drum mixer 24 from the lower portion thereof, the discharge valve 27 is closed. The rotation speed settings of the feeding operation and the discharging operation of the roller mixer 24 are both 2 r/min. The drum mixer 24 is horizontally arranged, and a manhole 65 is formed in the drum body of the drum mixer 24 for convenient maintenance. The materials in the buffer bin 26 enter the opposite spiral 30 through the mixture discharging valve 29, and the mixture is conveyed to the discharging opening 31 to be granulated in the next procedure through the operation of the opposite spiral 30. A level meter is arranged on the buffer bin 26, and when the level meter detects that the buffer bin 26 has materials and the material level has no change, a rapping motor on the buffer bin 26 is started and the material loosening device 28 is operated. The function of the mix discharge valve 29 is to prevent a large amount of material from entering the counter-helix 30 and pressing the counter-helix 30 to death. The opposite spiral 30 is fed at both ends of the spiral, and a feed opening 31 is arranged in the middle of the spiral. The top of the buffer bin 26 is flush with the middle of the drum mixer 24 and is relatively closed, so that the field dust can be reduced. The opposite spiral 30 is provided with a material cleaning opening below, and the spiral is as short as possible to meet the production requirement so as to avoid the material from being accumulated in the spiral and pressing the opposite spiral 30.

Referring to the lower half of fig. 3, the first hopper 32, the second hopper 34, the third hopper 38, the fourth hopper 44, the fifth hopper 46, the fine powder bin 42 and the bin 43 are all in a trapezoidal structure with a large top and a small bottom, the cross section is rectangular, the inclination angle of each side face is larger than 45 degrees, and the contact surface of an inner tangent plane and a material contact surface is provided with a wear-resistant and smooth lining plate, such as a polytetrafluoroethylene plate. The valves at the bottom of the hopper five 46, the fine powder bin 42 and the storage bin 43 are all gate valves, and the purpose is to ensure that the materials run smoothly in the hopper or the bin without accumulation, stockpiling and blockage. A material level meter is arranged in each hopper or each bin to monitor the material level. The top parts of the first hopper 32, the second hopper 34, the fine powder bin 42 and the bin 43 except for the feed inlet are respectively provided with a cover plate, and the cover plates are provided with movable observation ports, so that the dust escape is reduced as much as possible, and the material condition in the hoppers or the bins is convenient to observe. The first hopper 32, the third hopper 38 and the fourth hopper 44 are also respectively connected with a dust removal pipe so as to reduce the problem of field dust emission. The material in the fine powder bin 42 is pressed to be granulated, so the material directly returns to the second hopper 34 and then uniformly enters the fifth hopper 46 to be pressed and granulated for the second time. The feeding machine 33 is hung at the discharging opening of the first hopper 32 through a spring, and the feeding machine 33 inclines downwards and the discharging opening of the feeding machine is communicated with the fourth hopper 44. The back of the feeder 33 is provided with a rapping motor, vanadium slag enters the hopper IV 44 through the vibration of the rapping motor, the amplitude of the rapping motor is adjusted, the purpose of adjusting the distance between the feeder 33 and the feeding opening of the hopper I32 is achieved, and therefore the feeding amount is adjusted. The feeding machine 33 is arranged at the feed opening of the first hopper 32 through a spring, and the spring is used for preventing the feeding machine 33 from being in hard contact with the first hopper 32 and the fourth hopper 44; the blanking plate of the feeder 33 is welded with baffle plates along two sides of the vanadium slag running direction to avoid the vanadium slag from spilling. The feed opening of the fourth hopper 44 is aligned with the central line between the first 35 two compression rollers of the compression roller machine, the opening of the feed opening of the fourth hopper 44 is smaller than the distance between the central lines of the two compression rollers, two side faces of the feed opening of the fourth hopper 44 are arc-shaped material baffle plates, and the distance between the edge of the feed opening of the fourth hopper 44 and the surface of the compression roller is 1mm, so that vanadium slag is prevented from being scattered. Two press rolls of the first press roll machine 35 run in opposite directions, for example, in fig. 3, the left press roll rotates clockwise, and the right press roll rotates counterclockwise; the gap between the two compression rollers is larger than the maximum particle diameter of the vanadium slag, for example, the gap between the compression rollers is 1 mm. The press roll of the first press roll machine 35 is a cylinder, hemispherical concave surfaces with the diameter of 2-3 mm are drilled on the surface of the cylinder, the hemispherical concave surfaces are regularly and uniformly distributed on the surface of the press roll, the centers of the spheres of the hemispherical concave surfaces are parallel to the axial line of the press roll on a straight line along the direction of the press roll shaft, connecting lines along the direction of the cross section of the press roll are on a circle, and the distance between every two adjacent hemispherical concave surfaces is 1 mm; the distance between the outer edges of the hemispheric concave surfaces at the two tail ends of the first compression roller 35 of the first compression roller is aligned with the long edge of the feed opening of the fourth hopper 44. The first compression roller 35 and the first edge trimmer 36 are arranged in a space formed by the fifth hopper 46, the first hopper baffle plate 45 and the fourth hopper 44, and the motors of the first compression roller 35 and the first edge trimmer 36 are arranged outside the space formed by the fifth hopper 46, the first hopper baffle plate 45 and the fourth hopper 44. Welding iron columns on the surface of the cylinder body of the first edge cutter 36, for example, welding iron columns with the diameter of 3mm and the height of 5mm, wherein the distance between the centers of adjacent iron columns in the same row is 8mm, the iron columns are regularly and uniformly distributed on the surface of the cylinder, and the centers of the iron columns are parallel to the axis of the cylinder on a straight line along the direction of the axis of the cylinder; the iron columns on the cylinder are 4 rows in total and symmetrically distributed, and the iron columns in adjacent rows are arranged in a staggered manner, for example, the iron columns in the second row are positioned at the centers of the adjacent iron columns in the first row.

The shortest distance between the tail end of the iron column of the first edge cutter 36 and the inner side of the hopper five 46 is 5mm, and the distance between the iron columns at the two ends of the barrel and the side face of the hopper five 46 is 4 mm. The first edge trimmer 36 is used for scattering the pressed cake from the first press roller 35 into granules and then enters the second press roller 37. The structure and principle of the second compression roller 37 are the same as those of the first compression roller 35, and the second compression roller is used for compressing the compressed granular vanadium slag again to enhance the strength of the vanadium slag balls. The diameter of the hemispherical concave surface on the press roll of the second press roll 37 is 8mm, and the rest parameters are the same as those of the first press roll 35. The principle of the second edge trimmer 39 is the same as that of the first edge trimmer 36, the height of the iron columns is 15mm, the center distance of adjacent iron columns in the same row is 16mm, the shortest distance between the tail end of the iron column of the second edge trimmer 39 and the inner sides of the third hopper 38 and the sieve plate 48 is 15mm, the distance between the iron columns at two ends of the cylinder of the second edge trimmer 39 and the side surface of the third hopper 38 is 10mm, and other parameters are the same as those of the first edge trimmer 36. The second edge cutter 39 is used for scattering the pressed cake from the second roller 37 to make the pressed cake into granules and enter the sieve plate 48. The aperture of the sieve plate 48 is 10mm, the sieve plate 48 is arc-shaped and is arranged at the discharge hole of the third hopper 38, and the circle center of the arc-shaped sieve plate 48 is preferably superposed with the circle center of the cylinder of the second edge cutter 39. The top of the fine powder bin 42 is provided with a first grid screen 40, the inclination angle of the first grid screen 40 needs to be larger than 30 degrees, the top end of the first grid screen 40 is provided with a rapping motor, and the first grid screen 40 is periodically vibrated to avoid the accumulation of materials on the grid screens. First check mesh screen 40 is formed by 3 mm's rebar welding, and adjacent reinforcing bar interval is 5 mm. After the vanadium slag granules which come down from the sieve plate 48 are sieved by the first mesh sieve 40, fine particles enter the fine powder bin 42, return to the hopper II 34 through the inclined angle belt I41, and uniformly enter the hopper V46 for re-granulation. Oversize materials of the first grid mesh screen 40, namely coarse particles of 5-10 mm enter a storage bin 43, and are sent to the next procedure through a second inclination angle belt 49 as qualified vanadium slag balls in the procedure. The first hopper baffle plate 45 and the second hopper baffle plate 47 are respectively connected with the fourth hopper 44 and the fifth hopper 46 through hinges and are respectively placed above the fifth hopper 46 and the third hopper 38, handles are welded on the outer surfaces of the first hopper baffle plate 45 and the second hopper baffle plate 47, and the operating conditions of the materials in the fifth hopper 46 and the third hopper 38 and the operating conditions of the first roller 35, the second roller 37, the first edge trimmer 36 and the second edge trimmer 39 can be observed by pulling the first hopper baffle plate 45 and the second hopper baffle plate 47 open through the handles.

The ball pressing device can be a vanadium slag granulating device disclosed in the publication number CN 109999721A.

The material distribution device and the drying device are shown in figure 2. The discharge end of the second inclination belt 49 is positioned at the top of the second buffer bin 55, the top of the second buffer bin 55 is connected with a dust removal pipeline to avoid on-site dust raising, the inclination angle of the lower part of the second buffer bin 55 is not less than 30 degrees to ensure smooth logistics, the lower part of the second buffer bin 55 is closed, and vanadium slag balls enter the feed end of the distribution pipe from the lower part. The second 49 discharge ends of the inclination belt are right opposite to the second 55 inner walls of the buffer bin, namely the second 55 inner walls of the buffer bin receive the impact of the vanadium slag balls at the second 49 discharge ends of the inclination belt, and the second 55 inner walls of the buffer bin are added with rubber or plastic plates with elasticity and wear resistance to relieve the impact force of the vanadium slag balls and avoid the damage of the vanadium slag balls. And a gate valve is arranged at a discharge port at the lower part of the second buffer bin 55 and used for controlling the amount of the material entering the distribution pipe 56, so that the material stopping treatment is required when the post-process technology and equipment are abnormal. The cross section of the distributing pipe 56 is arc-shaped, the cross section of the feeding end of the distributing pipe is closed to prevent material balls from scattering, two shafts, namely a shaft I50 and a shaft III 54, are arranged on the back of the distributing pipe 56, the shaft I50 is close to the feeding end of the distributing pipe 56, and the distributing pipe 56 is driven by a power facility to reciprocate around the shaft I50 as the circle center. The distributing pipe 56 inclines downwards, and the inclination angle is 15-30 degrees later: the dip angle is less than 15 degrees, the vanadium slag balls are not smooth to flow on the distributing pipe 56, the dip angle is more than 30 degrees, and the vanadium slag balls are damaged by collision when the vanadium slag balls move on the distributing pipe 56 at a high speed and easily reach the distributing chute 57.

The turntable 52 is driven by the motor to rotate, and a second shaft 51 is arranged on the outer edge of the turntable 52; two ends of the connecting rod 53 are respectively connected with the first shaft 50 and the second shaft 51 and are movably connected, so that the connecting rod can freely rotate; the motor drives the turntable 52 to rotate around the center of the turntable 52, i.e. the second outer edge shaft 51 of the turntable 52 rotates around the center of the turntable 52. Under the driving of the second shaft 51 and the connecting rod 53 and the fixing of the first shaft 50, the third shaft 54 reciprocates, so that the material distribution of the material distribution pipe 56 on the first flow guide pipe 66 of the material distribution tank 57 is realized. Because the distribution pipe 56 reciprocates at a constant speed, uniform distribution on the first flow guide pipe 66 is realized. The reciprocating displacement of the discharge end of the distributing pipe 56 is equal to the width of the feed end of the first flow guide pipe 66. The distributing trough 57 consists of a first flow guide pipe 66, a flat plate 67, a second flow guide pipe 68, a cover plate 69, a hinge 70, a movable plate 71 and side plates at two sides; the bottom plate of the distributing trough 57 is composed of a first flow guide pipe 66, a flat plate 67 and a second flow guide pipe 68, and the inclination angles of the first flow guide pipe, the flat plate and the second flow guide pipe are consistent, and are preferably 15-30 degrees. The cover plate consisting of the cover plate 69, the hinge 70 and the movable plate 71 is positioned above the first draft tube 66 and the flat plate 67, the hinge 70 and the movable plate 71 are positioned above the flat plate 67, and the amount of the material balls entering the mesh belt 58 of the dryer 59 of the vanadium slag material balls can be finely adjusted by adjusting the width of the gap between the tail end of the movable plate 71 and the flat plate 67. The distributing chute 57 is provided with a material level meter, and the change of the supplied material amount can be known through the change of the material level of the distributing chute 57. The distributing chute 57 is provided with a cover plate, a side plate is welded between the cover plate and a bottom plate of the distributing chute 57, and the movable plate is connected with the cover plate through a hinge; the bottom plate both sides welding curb plate of distributing chute 57 are but not welded on the fly leaf, and the width of fly leaf slightly is less than distributing chute 57 bottom plate width so as to guarantee that the fly leaf can be around hinge free rotation. The bottom plate of the distributing chute 57 is obliquely arranged and is divided into three sections, namely a first flow guide pipe, a flat plate and a second flow guide pipe from top to bottom, the first flow guide pipe and the second flow guide pipe are formed by cutting a pipeline and then welding, and the second flow guide pipe is more than the first flow guide pipe in number and mainly ensures that vanadium slag balls are more uniformly distributed on the mesh belt 58; the first diversion pipe and the second diversion pipe are used for guiding the vanadium slag balls to run according to a specified route, so that the uniform distribution is facilitated, and the damage caused by collision of the balls can be avoided. The discharge end of the second flow guide pipe has a certain gap with the mesh belt 58, and the gap is adjusted to be not only free from friction caused by small gap between the discharge end of the second flow guide pipe 68 and the mesh belt 58 but also free from uneven material distribution caused by large gap to rolling of the material ball contact net belt 58. The width of the distribution chute 57 is equal to the width of the mesh belt 58.

Drying device referring to fig. 2, the drying device includes a drying box 59, and a ring-shaped and rotatably movable mesh belt 58 is disposed in the drying box 59, that is, the mesh belt 58 is driven by a driving device, so that the mesh belt 58 rotates around rollers. A feed port connected with the discharge end of the material distribution device is arranged on the drying box 59, and the feed end of the mesh belt 58 is arranged below the feed port; the drying box 59 is provided with a discharge port at an end opposite to the feed port. An air outlet valve 60 is installed at the top of the drying box 59 and used for discharging air; an air inlet valve 61 is arranged at the bottom or below the side surface of the drying box 59 and used for the inlet of hot air. The air outlet valves 60 are arranged at the position, close to the feeding end of the mesh belt 58, of the drying box 59 at equal intervals, and the air inlet valves 61 are arranged at the position, far away from the feeding end of the mesh belt 58, of the drying box 59 at equal intervals, so that the path of hot air flowing through is longer, and meanwhile, the drying process can be conveniently adjusted by adjusting the air outlet valves 60 and the air inlet valves 61. The bottom of the drying box 59 is provided with a collecting hopper, and the bottom of the collecting hopper is provided with a fine powder valve 62. The collecting hopper is used for collecting slag generated in the vanadium slag ball drying process, for example, a plurality of conical collecting hoppers are arranged at the bottom of the drying box 59 at equal intervals, and the lower part of each collecting hopper is connected to the ball pressing device through a conveying device. The discharge end of the mesh belt 58 is connected with the second grid mesh screen 64, the screen of the second grid mesh screen 64 is connected with the discharge port of the drying box 59, and the discharge port of the drying box 59 is the outlet of the qualified vanadium slag pellets. A conical aggregate bin is also arranged below the second grid screen 64, and the lower part of the aggregate bin is connected to the ball pressing device through a conveying device. In order to avoid the vanadium slag balls from splashing at the discharge end of the mesh belt 58, a material folding plate 63 is arranged on the lower side of the discharge end of the mesh belt 58 of the drying device, a second lattice mesh screen 64 is arranged on the lower side of the material folding plate 63, and the material folding plate 63 and the second lattice mesh screen 64 are obliquely arranged and have opposite oblique directions.

The mesh belt 58 of the drying device is a layer, the mesh belt 58 is a porous belt-shaped steel wire mesh, and the distance between adjacent steel wires is not more than 5 mm. The vanadium slag balls are driven by the mesh belt 58 to reach the discharge end of the dryer 59, and under the action of inertia and gravity, the vanadium slag balls are thrown onto the surface of the material folding plate 63 and enter the second grid screen 64 under the flow guide of the material folding plate 63; the vanadium slag pellets are screened by the second grid screen 64 to become qualified vanadium slag pellets, and the vanadium slag pellets are conveyed to a qualified bunker by a belt to be stored for later use. During the process of drying the vanadium slag pellets in the drying device, a small amount of fine powder is generated, the fine powder is accumulated in the collecting hopper, the fine powder valve 62 is opened periodically to discharge the fine powder, and the fine powder returns to the second hopper 34 through a belt or a spiral to continue to be pressed into pellets.

High-temperature hot air enters the drying box 59 through the air inlet valve 61, the air inlet valve 61 controls the air volume so as to control the temperature of the atmosphere in the drying box 59, and the opening degree of the air inlet valve 61 is adjusted so as to form the temperature gradient of the atmosphere in the drying box 59; the dust-containing gas after heat exchange is discharged through the air outlet valve 60 and then introduced into a dust remover, the dust-containing gas is discharged after reaching the standard after treatment, and the opening degree of the air outlet valve 60 is adjusted to form the temperature gradient of the atmosphere in the dryer 59.

For example, the drying box 59 has a total length of 42m, and is divided into 14 temperature zones along the length direction, each temperature zone has a length of 3m, the 1 st temperature zone is located near the inlet, and so on, and the 14 th temperature zone is located near the outlet. The temperature of the 1 st temperature zone is 70-80 ℃, the temperature of the 2 nd temperature zone is 75-90 ℃, the temperature of the 3 rd temperature zone is 85-95 ℃, the temperature of the 4 th temperature zone to the 6 th temperature zone is gradually increased from 105 ℃ to 250 ℃, the temperature of the 7 th temperature zone to the 10 th temperature zone is stabilized at 260-300 ℃, and the temperature of the 11 th temperature zone to the 14 th temperature zone is gradually reduced to about 100 ℃. The 1 st to 3 rd temperature zones are shallow drying zones, the water content of the vanadium slag pellets in the zones is high, the water content to be removed is large, if the temperature suddenly exceeds 100 ℃, a large amount of water is transferred outwards from the interior of the pellets, and the volume of the water is changed from liquid to gas and is sharply increased, so that the pellets are cracked to cause pulverization of the pellets. The highest temperature of the 4 th-10 th temperature zone is controlled to be less than or equal to 300 ℃ in the deep drying zone, and the purpose is as follows: firstly, the high temperature is more beneficial to the water changing into gas state to escape from the interior of the vanadium slag material ball, and the drying time is shortened; secondly, under the environment of 250-300 ℃, the metallic iron in the vanadium slag pellets is oxidized, so that the metallic iron in the vanadium slag pellets is prevented from being reoxidized and discharged in the subsequent roasting equipment, the temperature gradient control of the furnace temperature (kiln temperature) is difficult due to heat, and the subsequent sodium oxide roasting of the vanadium slag pellets is facilitated; and thirdly, the temperature is not higher than 300 ℃, the further oxidation and heat release of other substances in the material balls are avoided, the temperature in the drying device is not controlled, and the substances in the vanadium slag material balls react in advance in a large amount, so that the quality of the vanadium slag material balls is unqualified, and the sodium oxide roasting of the vanadium slag material balls in the later step is influenced to extract vanadium. And the 11 th-14 th temperature zone is a cooling zone, so that the moisture of the vanadium slag pellets is further reduced, and the pellets are cooled to about 100 ℃ to be convenient to store and transport. The retention time of the vanadium slag pellets in the drying box 59 is 45-60 min, and the moisture of the vanadium slag pellets is less than or equal to 1%, namely the mass of the moisture accounts for less than 1% of the mass of the whole vanadium slag pellets.

The preparation method of the vanadium slag pellet is additionally explained below.

S1, preparing a binder. The adhesive is prepared according to the mass ratio of humic acid to caustic soda flakes to water of 3:1:17, specifically 750kg of humic acid, 250kg of caustic soda flakes and 4.250m of water³And (4) preparing. The diameter of the adhesive tank 4 is 2m, the height thereof is 3m, and the inclination angle of the tank bottom slope 8 is 45 degrees. The diameter of the high-level tank 15 is 2m, the height of the high-level tank is 2m, and the inclination angle of a cone at the bottom of the tank is 15 degrees. The water temperature for boiling the binder is less than or equal to 60 ℃, and the boiling time of the binder is more than or equal to 4 hours under the condition that the temperature is 85-boiling.

S2, preparing a mixture. The molar ratio of sodium element of the soda ash to vanadium element of the vanadium slag in the primary mixed material is 3.1-3.5, and 0.05-0.10 m is sprayed on each ton of mixed material³And (4) preparing a mixture by using the decocted binder. For example, the molar ratio is 3.3, and the binder is 0.08m³。

The hopper 22 is a rectangular box 300mm long, 200mm wide and 400mm high. The movable turning plate 21 is a square plate with the side length of 300mm, the formed inclination angle is 60 degrees, and the movable turning plate 21 operates once in 6 min. The dip angle of the chute 23 is 60 degrees, and the pipe diameter is DN200 mm. The mixing capacity is designed according to the mixing capacity of 10t/h by using a roller mixer 24. The drum mixer 24 has a drum diameter of 1.5m and a length of 1 m. The material raising plate 25 is a long steel bar with the width of 0.22m and the thickness of 6mm and is welded on the inner wall of the drum mixer 24; the same material raising plate 25 is composed of two steel bars, the inclination angle formed by the two steel bars is 10 degrees, the inclination angle directions of the adjacent material raising plates 25 are opposite, and the inclination angle peak of the material raising plate 25 is positioned at the center of the barrel body of the roller mixer 24 along the material walking direction. The speed of the mixing operation of the drum mixer 24 was set to 10 r/min. After the drum mixer 24 operates for 5min, the rotating speed of the drum mixer 24 is reduced to 2r/min, so that the discharging is convenient. The rotational speed settings of the feeding operation and the discharging operation of the roller mixer 24 are both 2 r/min.

And S3, preparing vanadium slag material balls. The hopper I32, the hopper II 34, the hopper III 38, the hopper IV 44, the hopper V46, the fine powder bin 42 and the bin 43 are all of a trapezoid structure with a large top and a small bottom, the cross section is rectangular, the inclination angle of each side surface is 60 degrees, and inner contact surfaces, namely contact surfaces with materials, need to be added with polytetrafluoroethylene plates, the volumes of the inner contact surfaces and the contact surfaces with the materials are 20m respectively³、3m³、5m³、5m³、5m³、5m³、20m³. Two compression rollers of a first compression roller machine 35 run oppositely, the compression rollers are cylinders, hemispherical concave surfaces with the diameter of 3mm are drilled on the surfaces of the cylinders, the gap between the two compression rollers is 1mm, the length of each compression roller is 800mm, and the diameter of each compression roller is 400 mm; two compression rollers of the first compression roller machine 35 run in opposite directions, the compression rollers are cylinders, hemispherical concave surfaces with the diameter of 8mm are drilled on the surfaces of the cylinders, the gap between the two compression rollers is 1mm, and the compression rollers are 800mm long and 400mm in diameter.

And S4, distributing. Buffer bin with two 55 volumes of 5m³The inner wall of the second buffer bin 55 is added with a polytetrafluoroethylene plate, and the distributing pipe 56 is half of a DN200mm pipeline, namely the pipeline is obtained by cutting the pipeline into halves. The first flow guide pipe is half of the DN32mm pipeline, namely the pipeline is cut into two halves. The second flow guide pipe is one third of the pipeline DN20mm, namely the second flow guide pipe is obtained by cutting off one third of the cross section of the pipeline.

And S5, drying. The total length of the drying box 59 is 42m, the drying box is divided into 14 temperature zones, the length of each temperature zone is 3m, the temperature zone 1 is close to the feeding end, and the like, and the temperature zone 14 is close to the discharging end. The temperature of the 1 st temperature zone is 70-80 ℃, the temperature of the 2 nd temperature zone is 75-90 ℃, the temperature of the 3 rd temperature zone is 85-95 ℃, the temperature of the 4 th temperature zone to the 6 th temperature zone is gradually increased from 105 ℃ to 250 ℃, the temperature of the 7 th temperature zone to the 10 th temperature zone is stabilized at 260-300 ℃, and the temperature of the 11 th temperature zone to the 14 th temperature zone is gradually reduced to about 100 ℃. The retention time of the pellets in the dryer is 45-60 min, and the moisture of the obtained vanadium slag pellets is less than or equal to 1%.

Claims

1. Vanadium slag pelletizing preparation system, its characterized in that: the adhesive mixing device comprises an adhesive preparation device, a mixing device, a ball pressing device, a distributing device and a drying device, wherein the adhesive preparation device is connected with the mixing device through a pipeline and provides adhesive for the mixing device; the drying device comprises a drying box (59), an annular and rotatably-moving mesh belt (58) is arranged in the drying box (59), the mesh belt (58) is a layer, an air outlet valve (60) is installed at the top of the drying box (59), the air outlet valves (60) are installed at the position, close to the feeding end of the mesh belt (58), of the drying box (59) at equal intervals, an air inlet valve (61) is installed at the bottom or below the side face of the drying box (59), and the air inlet valves (61) are installed at the position, far away from the feeding end of the mesh belt (58), of the drying box (59) at equal intervals; a plurality of conical collecting hoppers are arranged at the bottom of the drying box (59) at equal intervals, and fine powder valves (62) are arranged at the bottoms of the collecting hoppers; set up the feed inlet that links up with the discharge end of distributing device on stoving case (59), the below of feed inlet is the feed end of guipure (58), and the discharge end of guipure (58) links up second check mesh screen (64), also sets up conical collecting hopper under the sieve of second check mesh screen (64), and the below of each collecting hopper all is connected to the ball device of pressing through conveyor, and the sieve of second check mesh screen (64) is gone up and is linked up with the discharge gate of stoving case (59).

2. The vanadium slag pellet preparation system of claim 1, wherein: the discharge end downside of drying device's guipure (58) sets up and rolls over flitch (63), and the downside that rolls over flitch (63) is second check net sieve (64), and it sets up and the opposite direction of slope to roll over flitch (63) and second check net sieve (64) slope.

3. The vanadium slag pellet preparation system according to claim 1 or 2, wherein: the adhesive preparation device comprises an adhesive tank (4) and a high-level tank (15), wherein the adhesive tank (4) is provided with a steam pipe and a water inlet pipe, the steam pipe and the water inlet pipe are respectively provided with a first steam valve (1) and a water inlet valve (2), a first stirrer (3) is arranged in the adhesive tank (4), the adhesive tank (4) is provided with an opening (5) which can be opened and closed, the outlet of the adhesive tank (4) is connected to the high-level tank (15) through a pipeline, and the pipeline is provided with a first discharge valve (10); the steam pipe is arranged on the high-level tank (15), the second steam valve (12) is arranged on the steam pipe, the second stirrer (13) is arranged in the high-level tank (15), the discharge pipe is connected to the bottom of the high-level tank (15), the discharge pipe is connected with the mixing device, and the second discharge valve (19) is arranged on the discharge pipe.

4. The vanadium slag pellet preparation system of claim 3, wherein: the two sets of the binder tanks (4) are the same, and the discharge ends of the first discharge valves (10) of the two sets of the binder tanks (4) are converged and then connected with the high-level tank (15).

5. The vanadium slag pellet preparation system of claim 3, wherein: the bottom of the adhesive tank (4) is provided with a slope (8), and the bottom of the slope (8) is provided with a dredging opening (9); blades are arranged at the tail ends of the first stirrer (3) and the second stirrer (13), a steam drum is arranged at the tail end of the steam pipe, and a small hole is arranged at the upper part of the steam pipe; a power pump (11) is arranged on a pipeline between a first discharge valve (10) of the binder tank (4) and the high-level tank (15), the binder tank (4) and the high-level tank (15) are respectively provided with a liquid level meter and a thermometer, and a discharge pipe of the high-level tank (15) is also provided with a flow meter (18).

6. The preparation method of the vanadium slag pellet is characterized by comprising the following steps: the vanadium slag pellet production system of any one of the claims 1 to 5 comprises the following steps:

s3, preparing the mixture prepared in the S2 into vanadium slag balls through a ball pressing device;

s4, distributing the vanadium slag balls prepared in the step S3 on a mesh belt (58) of a drying device through a material distribution device;

7. The method for preparing vanadium slag pellets according to claim 6, wherein the method comprises the following steps: in step S1, when preparing the adhesive,according to the weight proportions of 750kg of humic acid, 250kg of caustic soda flakes and 4.250m of water³Adding water into a binder tank (4) and stirring, then adding caustic soda flakes and stirring, adding humic acid after the caustic soda flakes are fully dissolved, heating the liquid to be more than or equal to 85 ℃ by steam, and fully decocting to obtain the binder.

8. The method for preparing vanadium slag pellets according to claim 6, wherein the method comprises the following steps: in the step S2, soda ash and vanadium slag are mixed according to the molar ratio of sodium element of soda ash to vanadium element in vanadium slag of 3.1-3.5 to obtain a primary mixed material, and 0.05-0.10 m is added into 1 ton of the primary mixed material³Spraying the binder in the proportion of the binder, and preparing the mixture by a mixing device.

9. The method for preparing vanadium slag pellets according to claim 6, wherein the method comprises the following steps: in the step S5, a drying box (59) of the drying device is divided into 14 areas from a feeding hole to a discharging hole, wherein the 14 areas are a 1 st temperature area and a 2 nd temperature area … … 14 th temperature area in sequence, the 1 st temperature area is 70-80 ℃, the 2 nd temperature area is 75-90 ℃, the 3 rd temperature area is 85-95 ℃, the 4 th temperature area to the 6 th temperature area are gradually increased from 105 ℃ to 250 ℃, the temperatures of the 7 th temperature area to the 10 th temperature area are stabilized at 260-300 ℃, and the temperatures of the 11 th temperature area to the 14 th temperature area are gradually decreased to 100 ℃; the retention time of the vanadium slag pellets in the drying box (59) is 45-60 min, and the water content of the vanadium slag pellets is less than or equal to 1%.