Pressurized fluidized roasting system and roasting method

Abstract

A pressurized fluidized roasting system comprises a fluidized furnace tube and a pressurized roasting device. A first fluidizing gas inlet is formed in the lower end of the fluidizing furnace tube, and a first fluidizing gas outlet is formed in the upper end of the fluidizing furnace tube. The pressurizing roasting device is arranged beside the fluidization furnace tube in parallel, an opening communicated with an inner cavity of the pressurizing roasting device is formed in the side wall of the inner cavity of the fluidization furnace tube, and a movable baffle is arranged at the opening. A second fluidizing gas inlet is formed in the lower end of the pressurizing roasting device, and a second fluidizing gas outlet is formed in the upper end of the pressurizing roasting device. Wherein the pressurization mode of the pressurization roasting device is that pressurization is carried out by increasing the gas flow or changing the volume of the device. According to the pressurized fluidized roasting system and roasting method provided by the invention, materials are preheated in the fluidized furnace tube and then are fed into the pressurized roasting tube for pressurized roasting, so that the roasting time is shortened, the roasting efficiency and the resource utilization rate are improved, and the problem of long time of a normal fluidized roasting process is solved.

Description

Technical Field

[0001] The present invention relates to a roasting system and a roasting method, in particular to a pressurized fluidized roasting system and a roasting method, belonging to the technical field of fluidized roasting. Background Art

[0002] Vanadium is a critical strategic material. In recent years, the development of vanadium products both domestically and internationally, the expansion of vanadium applications, and the demands of economic development have increased demand for vanadium, driving its price upwards and sparking interest in building vanadium extraction plants across the country. However, current vanadium extraction technologies are hampered by drawbacks such as wide variations in raw materials, lengthy process flows, low vanadium recovery rates (mostly below 60%), high costs, and environmental concerns. These drawbacks impact the profitability of vanadium companies, threatening their survival and, more importantly, leading to a waste of vanadium resources. Therefore, the development of efficient, environmentally friendly, and economically viable new vanadium extraction processes tailored to the characteristics of vanadium raw materials is gaining increasing attention.

[0003] Stone coal vanadium ore is a low-grade vanadium-bearing resource with extremely abundant reserves in my country. Vanadium in stone coal vanadium ore typically exists in isomorphous, adsorbed, or isolated mineral forms. Its occurrence directly determines the difficulty and method of vanadium extraction. Stone coal vanadium ore in most regions of my country exists in an isomorphous form, where V(III) isomorphically replaces Al(III) in mica-group minerals, or vanadium oxide (VO2) isomorphically replaces Al(III) in the crystal lattice with Mg(II) and Fe(II) to form vanadium-bearing mica. There are many vanadium extraction processes, and the technology for extracting vanadium compounds from vanadium-containing raw materials varies depending on the raw material. Common methods for extracting vanadium from ores or other vanadium-containing raw materials include pyrometallurgical processes, combined pyrometallurgical-hydrometallurgical processes, and hydrometallurgical processes.

[0004] my country boasts abundant vanadium resources. Vanadium reserves in stone coal (measured as V₂O₅) reach 117.97 million tons, of which 77.07 million tons are found in stone coal with a V₂O₅ content greater than 0.5%. This reserves are comparable to the total reserves of major vanadium-rich countries abroad. Stone coal is a low-quality, early-generation coal, mostly characterized by high ash content, low calorific value, a dense structure, and a high ignition point, making it difficult to burn and difficult to burn completely. Its calorific value generally ranges from 6,000 to 32,000 kJ / kg. In addition to 10% to 30% carbon, it also contains 0.2% to 2% vanadium, as well as other non-ferrous metals such as molybdenum and nickel. It also contains significant amounts of silicates, phosphorus, aluminum, and iron. As a low-quality energy source, it is currently rarely used and is mined solely as a separate vanadium deposit. Stone coal, a unique vanadium resource in my country, possesses extremely abundant reserves. Vanadium extraction from stone coal will become a key development direction for vanadium resource utilization in my country.

[0005] Currently, pyrometallurgical processes primarily utilize stacked roasting in tunnel kilns or rotary kilns, which suffer from slow heat transfer, low reaction efficiency, and poor roasting results. Fluidized bed roasting (fluidized bed roasting) has attracted attention as a relatively efficient and effective technology for processing anthracite vanadium ore resources. However, due to the high reaction temperature and time requirements for destroying the anthracite vanadium lattice structure, fluidized bed roasting suffers from incomplete reaction, long reaction times, and high energy consumption. Furthermore, anthracite vanadium ore often contains a certain proportion of residual carbon, which burns and generates heat during the fluidized bed roasting process, hindering stable temperature control in the system. Summary of the Invention

[0006] In response to the problems of incomplete reaction and long reaction time in the fluidization process of stone coal vanadium ore in the existing technology, the present invention proposes a pressurized fluidized roasting system and roasting method. After the stone coal vanadium ore is preheated in a fluidized furnace tube, it is sent into a pressurized roasting device. The pressurized roasting shortens the fluidized roasting time and improves resource utilization.

[0007] According to a first embodiment of the present invention, a pressurized fluidized roasting system is provided.

[0008] A pressurized fluidized roasting system, comprising a fluidized furnace tube and a pressurized roasting device. The lower end of the fluidized furnace tube is provided with a first fluidizing gas inlet, and the upper end is provided with a first fluidizing gas outlet. The pressurized roasting device is arranged side by side with the fluidized furnace tube, and an opening communicating with the inner cavity of the pressurized roasting device is provided on the inner cavity side wall of the fluidized furnace tube, and a movable baffle is provided at the opening. The lower end of the pressurized roasting device is provided with a second fluidizing gas inlet, and the upper end is provided with a second fluidizing gas outlet. The pressurization method of the pressurized roasting device is to increase the gas flow rate or to change the volume of the device for pressurization.

[0009] Preferably, the pressurized calcination device includes a pressurized calcination tube, the second fluidizing gas inlet is arranged at the lower end of the pressurized calcination tube, the second fluidizing gas outlet is arranged at the upper end of the pressurized calcination tube, and a regulating valve is provided at the second fluidizing gas outlet.

[0010] Preferably, the tube body of the pressurized roasting tube includes a fixed tube body and an elastic tube body, wherein the elastic tube body is connected to the fixed tube body, and the elastic tube body is optionally arranged on the upper side, the lower side or the horizontal side of the fixed tube body.

[0011] Preferably, the pressurized roasting tube further comprises a piston rod, which is connected to the outer side wall of the elastic tube body and controls the expansion and contraction of the elastic tube body.

[0012] Preferably, the pressure roasting apparatus further comprises a gas circulation conduit. One end of the gas circulation conduit is connected to the second fluidizing gas inlet, and the other end is connected to the gas outlet. Preferably, the gas circulation conduit is provided with a heating mechanism and a circulating fan.

[0013] Preferably, the system includes 1 to 4 independent pressure roasting units, preferably 2 to 3 independent pressure roasting units. The sidewalls of the fluidized bed furnace tube are provided with openings and movable baffles equal in number to the pressure roasting units, and the pressure roasting tube of each pressure roasting unit is connected to the inner cavity of the fluidized bed furnace tube through its corresponding opening.

[0014] Preferably, the system includes a pressure roasting device, wherein the pressure roasting tube is a cylindrical structure and is sleeved on the outside of the fluidized bed furnace tube.

[0015] Preferably, the movable baffle is a plate-shaped structure, the plate body is movably connected to the upper side wall of the opening, and the position of the movable baffle can be switched back and forth between covering the opening or covering the cross section of the fluidizing furnace tube above the opening.

[0016] Preferably, a slide rail is provided on the side of the movable baffle close to the upper side wall of the opening, a pulley and an angle adjustment mechanism are provided on the upper side wall of the opening, and the movable baffle is connected to the upper side wall of the opening through the pulley, the slide rail and the angle adjustment mechanism.

[0017] According to a second embodiment of the present invention, a pressurized fluidized roasting method is provided.

[0018] A pressurized fluidized roasting method, the method comprising the following steps: S1. Add material into the inner cavity of the fluidized furnace tube, and at the same time, introduce fluidizing gas into the inner cavity of the fluidized furnace tube from the first fluidizing gas inlet below the fluidized furnace tube, so that the material forms a fluidized state in the fluidized furnace tube and heats the material in the fluidized furnace tube.

[0019] S2. When the temperature in the fluidized bed furnace tube rises to the target reaction temperature range, the upper portion of the inner cavity of the fluidized bed furnace tube is closed, and the material is blown into the pressurized roasting device using fluidizing gas.

[0020] S3. After all the materials have entered the pressure roasting device, the opening is closed and the pressure roasting device is started to allow the materials to react under the target atmosphere pressure conditions. When the reaction of the materials is completed, the materials are discharged to obtain a reaction product.

[0021] Preferably, the material in step S1 is stone coal vanadium ore.

[0022] Preferably, the particle size of the material is less than 3 mm, preferably less than 1 mm.

[0023] Preferably, the fluidizing gas is oxygen or air, preferably air.

[0024] Preferably, the flow rate of the fluidizing gas is 0.2-5 m / s, preferably 0.5-3 m / s.

[0025] Preferably, the reaction temperature in step S2 is in the range of 500-1300°C, preferably 700-1000°C.

[0026] Preferably, the target atmosphere pressure in step S3 is 2 to 20 standard atmospheres, preferably 5 to 10 standard atmospheres.

[0027] Preferably, the reaction time of the materials under pressurized conditions is 0.15 to 0.25 hours.

[0028] In the present invention, a pressurized fluidized roasting system including a fluidized furnace tube and a pressurized roasting device is used. First, the material is fed into the fluidized furnace tube, and fluidizing gas is fed into the fluidized furnace tube from the first fluidizing gas inlet of the fluidized furnace tube, so that the material enters a fluidized state and is preheated at the same time. After the material preheating is completed, the material enters the pressurized roasting device, and fluidizing gas is introduced from the second fluidizing gas inlet. By changing the volume or gas pressure of the pressurized roasting device, the material is pressurized fluidized roasted in the pressurized roasting device. The pressurized roasting method shortens the roasting time, improves the roasting efficiency and resource utilization, and at the same time, the present invention integrates the fluidized furnace tube and the pressurized roasting device, reducing costs and space occupation, eliminating the need to transfer the intermediate product to another reaction vessel, and improving the reaction efficiency and resource utilization.

[0029] In the present invention, the pressurized roasting device includes a pressurized roasting tube, which has a second fluidizing gas inlet at its lower end and a gas outlet at its upper end, with a regulating valve disposed at the gas outlet. After the opening is closed by a movable baffle, the gas flow rate at the second fluidizing gas inlet and the valve opening of the regulating valve are controlled to achieve a pressurization effect. Furthermore, the tube body of the pressurized roasting tube is configured as a structure combining a fixed tube body and an elastic tube body, and the pressure within the pressurized roasting tube is increased by volume compression of the elastic tube body, wherein the elastic tube body can be disposed above or below the fixed tube body (e.g., Figure 1 ) or any side of the horizontal (such as Figure 3 ), so that the compression of the elastic tube body can change the overall internal volume of the pressurized roasting tube. More preferably, a gas circulation pipeline (such as Figure 4 Gas enters the pressurized roasting tube through a second fluidizing gas inlet at the lower end of the tube, is discharged through a gas outlet at the upper end, and then circulates back to the second fluidizing gas inlet through a gas circulation line. This facilitates regulating the pressure in the pressurized roasting tube by varying the gas volume or volume. Furthermore, a heating mechanism can be installed in the gas circulation line to ensure that the temperature in the pressurized roasting tube remains within the reaction temperature range.

[0030] In the present invention, the system may include one or more independent pressure roasting devices (such as Figure 5), and may also include a cylindrical pressure roasting device (such as Figure 6 ), the cylindrical pressure roasting device is sleeved on the outside of the fluidized bed furnace tube, which can also realize the pressure roasting function.

[0031] In the present invention, a movable baffle is used to control the communication state between the inner cavity of the fluidized furnace tube and the inner cavity of the pressurized roasting tube. When the movable baffle covers the opening, the fluidizing gas only passes through the fluidized furnace tube and / or the pressurized roasting tube. When the movable baffle covers the cross section of the fluidized furnace tube above the opening, the fluidizing gas passes from the fluidized furnace tube through the opening into the pressurized roasting tube, and drives the reactants in the fluidized furnace tube into the pressurized roasting tube for pressurized roasting.

[0032] In the present invention, a movable baffle is movably connected to the upper side wall of the opening (i.e., the side wall of the fluidized bed furnace tube above the opening) to switch the position of the movable baffle. The movable baffle and the upper side wall of the opening can be connected by a rotating mechanism. The upper end of the movable baffle is connected to the upper side wall of the opening by the rotating mechanism, and drives the lower end of the movable baffle to rotate about the rotating mechanism as a fixed point, thereby switching the position. The movable baffle and the upper side wall of the opening can also be connected by a slide rail, a pulley, and an angle adjustment mechanism. The slide rail and pulley control the position of the movable baffle, and the angle adjustment mechanism controls the tilt angle of the movable baffle (see the two positions of the movable baffle for details). Figure 1 、 Figure 2 ), the angle adjustment mechanism is one of a rotary bearing, a universal joint and other structures in the prior art that can realize the angle adjustment function; in addition, the movable baffle and the upper side wall of the opening can also be connected through any other existing technology that can realize the position state switching of the movable baffle.

[0033] In the present invention, the particle size of the material, the type of fluidizing gas, the fluidizing gas flow rate, the reaction temperature range, and the reaction atmosphere pressure are limited, so that the material is under optimal reaction conditions during the reaction process, the reaction rate is improved, the problem of long reaction time in the normal fluidized roasting process is solved, and resource utilization is improved.

[0034] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a pressurized fluidized bed roasting system and roasting method, which preheats the material in a fluidized bed furnace tube and then feeds it into a pressurized roasting tube for pressurized roasting, thereby shortening the roasting time, improving the roasting efficiency and resource utilization, and solving the problem of long normal fluidized bed roasting process time.

[0035] 2. The present invention provides a pressurized fluidized bed roasting system and roasting method, which provide multiple ways to adjust the pressure in the pressurized roasting tube, such as an elastic tube body, a piston rod, and a gas circulation pipeline, so that the materials in the pressurized roasting tube are under optimal reaction conditions, which is more conducive to system control and further improves reaction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the first structure of a pressurized fluidized roasting system provided by the present invention.

[0037] Figure 2 This is a schematic structural diagram of a pressurized fluidized bed roasting system provided by the present invention in an open state.

[0038] Figure 3 This is a second structural schematic diagram of a pressurized fluidized roasting system provided by the present invention.

[0039] Figure 4 This is a third structural schematic diagram of a pressurized fluidized roasting system provided by the present invention.

[0040] Figure 5 This is a top view of the pressurized fluidized bed roasting system described in Example 5 of the present invention.

[0041] Figure 6 This is a top view of the pressurized fluidized bed roasting system described in Example 8 of the present invention.

[0042] Figure numerals: 1: fluidized bed furnace tube; 2: pressurized roasting device; 201: pressurized roasting tube; 2011: fixed tube body; 2012: elastic tube body; 2013: piston rod; 202: regulating valve; 203: gas circulation pipeline; 204: heating mechanism; 205: circulating fan; 3: first fluidizing gas inlet; 4: first fluidizing gas outlet; 5: opening; 6: movable baffle; 7: second fluidizing gas inlet; 8: second fluidizing gas outlet. DETAILED DESCRIPTION

[0043] The technical solutions of the present invention are illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0044] According to a first embodiment of the present invention, a pressurized fluidized roasting system is provided.

[0045] A pressurized fluidized roasting system, comprising a fluidized furnace tube 1 and a pressurized roasting device 2. The lower end of the fluidized furnace tube 1 is provided with a first fluidizing gas inlet 3, and the upper end is provided with a first fluidizing gas outlet 4. The pressurized roasting device 2 is arranged side by side with the fluidized furnace tube 1, and an opening 5 communicating with the inner cavity of the pressurized roasting device 2 is provided on the side wall of the inner cavity of the fluidized furnace tube 1, and a movable baffle 6 is provided at the opening 5. The lower end of the pressurized roasting device 2 is provided with a second fluidizing gas inlet 7, and the upper end is provided with a second fluidizing gas outlet 8. The pressurization method of the pressurized roasting device 2 is to increase the gas flow rate or change the volume of the device for pressurization.

[0046] Preferably, the pressurized calcination device 2 includes a pressurized calcination tube 201, the second fluidizing gas inlet 7 is arranged at the lower end of the pressurized calcination tube 201, the second fluidizing gas outlet 8 is arranged at the upper end of the pressurized calcination tube 201, and a regulating valve 202 is provided at the second fluidizing gas outlet 8.

[0047] Preferably, the tube body of the pressurized roasting tube 201 includes a fixed tube body 2011 and an elastic tube body 2012. The elastic tube body 2012 is connected to the fixed tube body 2011, and the elastic tube body 2012 is optionally arranged on the upper side, lower side or horizontal side of the fixed tube body 2011.

[0048] Preferably, the pressurized roasting tube 201 further includes a piston rod 2013 , which is connected to the outer wall of the elastic tube body 2012 and controls the expansion and contraction of the elastic tube body 2012 .

[0049] Preferably, the pressure roasting device 2 further includes a gas circulation conduit 203. One end of the gas circulation conduit 203 is connected to the second fluidizing gas inlet 7, and the other end is connected to the gas outlet. Preferably, the gas circulation conduit 203 is provided with a heating mechanism 204 and a circulation fan 205.

[0050] Preferably, the system includes 1 to 4 independent pressurized roasting devices 2, preferably 2 to 3 independent pressurized roasting devices 2. The sidewalls of the fluidized bed furnace tube 1 are provided with openings 5 ​​and movable baffles 6, the same number as the pressurized roasting devices 2. The pressurized roasting tube 201 of each pressurized roasting device 2 is connected to the inner cavity of the fluidized bed furnace tube 1 through its corresponding opening 5.

[0051] Preferably, the system includes one pressurized roasting device 2 , and the pressurized roasting tube 201 is a cylindrical structure and is sleeved on the outside of the fluidized bed furnace tube 1 .

[0052] Preferably, the movable baffle 6 is a plate-shaped structure, and the plate body is movably connected to the upper side wall of the opening 5. The position state of the movable baffle 6 can be switched back and forth between covering the opening 5 or covering the cross section of the fluidizing furnace tube 1 above the opening 5.

[0053] Preferably, a slide rail is provided on the side of the movable baffle 6 close to the upper side wall of the opening 5, a pulley and an angle adjustment mechanism are provided on the upper side wall of the opening 5, and the movable baffle 6 is connected to the upper side wall of the opening 5 through the pulley, the slide rail and the angle adjustment mechanism. Example 1

[0054] A pressurized fluidized roasting system comprises a fluidized furnace tube 1 and a pressurized roasting device 2. The lower end of the fluidized furnace tube 1 is provided with a first fluidizing gas inlet 3, and the upper end is provided with a first fluidizing gas outlet 4. The pressurized roasting device 2 is arranged side by side with the fluidized furnace tube 1, and an opening 5 communicating with the inner cavity of the pressurized roasting device 2 is provided on the side wall of the inner cavity of the fluidized furnace tube 1, and a movable baffle 6 is provided at the opening 5. The lower end of the pressurized roasting device 2 is provided with a second fluidizing gas inlet 7, and the upper end is provided with a second fluidizing gas outlet 8. The pressurization method of the pressurized roasting device 2 is to increase the pressure by changing the volume of the device. Example 2

[0055] Example 1 is repeated, except that the pressurized calcination device 2 includes a pressurized calcination tube 201, the second fluidizing gas inlet 7 is arranged at the lower end of the pressurized calcination tube 201, the second fluidizing gas outlet 8 is arranged at the upper end of the pressurized calcination tube 201, and a regulating valve 202 is provided at the second fluidizing gas outlet 8. Example 3

[0056] The second embodiment is repeated, except that the tube body of the pressurized roasting tube 201 includes a fixed tube body 2011 and an elastic tube body 2012. The elastic tube body 2012 is connected to the fixed tube body 2011 and is arranged on the lower side of the fixed tube body 2011. Example 4

[0057] The second embodiment is repeated, except that the tube body of the pressurized roasting tube 201 includes a fixed tube body 2011 and an elastic tube body 2012. The elastic tube body 2012 is connected to the fixed tube body 2011 and is arranged on the horizontal side of the fixed tube body 2011. Example 5

[0058] Example 3 is repeated, except that the pressurized roasting tube 201 further includes a piston rod 2013 . The piston rod 2013 is connected to the outer wall of the elastic tube body 2012 and controls the expansion and contraction of the elastic tube body 2012 . Example 6

[0059] like Figure 4 As shown, Example 5 is repeated, except that the pressure roasting device 2 further includes a gas circulation conduit 203. One end of the gas circulation conduit 203 is connected to the second fluidizing gas inlet 7, and the other end is connected to the gas outlet. The gas circulation conduit 203 is provided with a heating mechanism 204 and a circulation fan 205. Example 7

[0060] Example 6 was repeated, except that the system included two independent pressurized roasting devices 2. The sidewalls of the fluidized bed furnace tube 1 were provided with openings 5 ​​and movable baffles 6, the same number as the number of pressurized roasting devices 2. The pressurized roasting tube 201 of each pressurized roasting device 2 was connected to the inner cavity of the fluidized bed furnace tube 1 through its corresponding opening 5. Example 8

[0061] like Figure 6 As shown, Example 6 is repeated, except that the system includes a pressure roasting device 2, and the pressure roasting tube 201 is a cylindrical structure and is sleeved on the outside of the fluidized bed furnace tube 1. Example 9

[0062] Repeat Example 7, except that the movable baffle 6 is a plate-shaped structure, and the plate body is movably connected to the upper side wall of the opening 5. The position state of the movable baffle 6 can be switched back and forth between covering the opening 5 or covering the cross section of the fluidizing furnace tube 1 above the opening 5.

[0063] A slide rail is provided on the side of the movable baffle 6 close to the upper side wall of the opening 5, and a pulley and an angle adjustment mechanism are provided on the upper side wall of the opening 5. The movable baffle 6 is connected to the upper side wall of the opening 5 through the pulley, the slide rail and the angle adjustment mechanism.

[0064] Application Example 1 The pressurized fluidized roasting system described in Example 9 was used to fluidize the stone coal vanadium ore. The specific process is as follows: A pressurized fluidized roasting method, the method comprising the following steps: S1. 100 g of stone coal vanadium ore particles with an average particle size of 0.92 mm were added to the inner cavity of a fluidized furnace tube. At the same time, air was introduced into the inner cavity of the fluidized furnace tube from the first fluidizing gas inlet below the fluidized furnace tube at a flow rate of 0.9 m / s to form a fluidized state in the fluidized furnace tube. The air introduced was heated until the temperature in the fluidized furnace tube gradually rose to 800 ° C.

[0065] S2. When the temperature in the fluidized bed furnace tube rises to 800°C, the movable baffle is adjusted to cover the cross section of the fluidized bed furnace tube above the opening, the upper part of the inner cavity of the fluidized bed furnace tube is closed, and the material is blown into the pressurized roasting device using fluidizing gas.

[0066] S3. After all the materials have entered the pressurized roasting device, the position of the movable baffle is adjusted again to cover the opening, the pressurized roasting device is started, the bottom of the elastic tube body of the pressurized roasting tube is moved upward, the volume of the container is reduced, and the pressure in the inner cavity of the pressurized roasting tube is increased to 7 standard atmospheres. The materials are allowed to react under this condition for 0.2 hours. After the reaction of the materials is completed, the materials are discharged to obtain 78g of reaction product.

[0067] The obtained reaction product was detected, wherein the V2O5 content was 1.5%.

[0068] Application Example 2 Example 1 was repeated, except that the average particle size of the stone coal vanadium ore particles in step S1 was 2.38 mm, the air flow rate was 2.5 m / s, the pressure in the pressurized roasting tube in step S3 was adjusted to 9 standard atmospheres, and the reaction time was changed to 0.1 h. Parallel experiments were performed to obtain 80 g of reaction product.

[0069] The obtained reaction product was detected, wherein the V2O5 content was 1.3%.

[0070] Application Example 3 Example 1 was repeated except that the pressure in the inner cavity of the pressurized calcination tube in step S3 was adjusted to 2 standard atmospheres. A parallel experiment was conducted to obtain 83 g of reaction product.

[0071] The obtained reaction product was detected, wherein the V2O5 content was 0.8%.

[0072] Application Example 4 Example 1 was repeated except that the pressure in the inner cavity of the pressurized calcination tube in step S3 was adjusted to 5 standard atmospheres. A parallel experiment was conducted to obtain 82 g of reaction product.

[0073] The obtained reaction product was detected, wherein the V2O5 content was 1.3%.

[0074] Application Example 5 Example 1 was repeated except that the reaction temperature in step S1 was adjusted to 750° C., and a parallel experiment was performed to obtain 80 g of reaction product.

[0075] The obtained reaction product was detected, wherein the V2O5 content was 1.4%.

[0076] Comparative Example 1 The fluidized roasting of stone coal vanadium ore is carried out using a roasting device comprising only a fluidized furnace tube, as follows: A fluidized roasting method, comprising the following steps: S1. 100 g of stone coal vanadium ore particles with an average particle size of 0.92 mm were added to the inner cavity of a fluidized furnace tube. At the same time, air was introduced into the inner cavity of the fluidized furnace tube from the first fluidizing gas inlet below the fluidized furnace tube at a flow rate of 0.9 m / s to form a fluidized state in the fluidized furnace tube. The air introduced was heated until the temperature in the fluidized furnace tube gradually rose to 800 ° C.

[0077] S2. The material was reacted in the fluidized bed furnace tube for 0.2 h. After the reaction was completed, the material was discharged to obtain 85 g of reaction product.

[0078] The obtained reaction product was detected, wherein the V2O5 content was 0.5%.

Claims

1. A pressurized fluidized bed roasting system, characterized in that: The system comprises a fluidizing furnace tube (1) and a pressurized roasting device (2); the lower end of the fluidizing furnace tube (1) is provided with a first fluidizing gas inlet (3), and the upper end is provided with a first fluidizing gas outlet (4); the pressurized roasting device (2) is arranged side by side with the fluidizing furnace tube (1), and an opening (5) communicating with the inner cavity of the pressurized roasting device (2) is provided on the inner cavity side wall of the fluidizing furnace tube (1), and a movable baffle (6) is provided at the opening (5); the lower end of the pressurized roasting device (2) is provided with a second fluidizing gas inlet (7), and the upper end is provided with a second fluidizing gas outlet (8); wherein, the pressurization method of the pressurized roasting device (2) is to increase the gas flow rate or to change the volume of the device for pressurization.

2. The system according to claim 1, wherein: The pressurized roasting device (2) comprises a pressurized roasting tube (201), the second fluidizing gas inlet (7) is arranged at the lower end of the pressurized roasting tube (201), the second fluidizing gas outlet (8) is arranged at the upper end of the pressurized roasting tube (201), and a regulating valve (202) is provided at the second fluidizing gas outlet (8).

3. The system according to claim 2, characterized in that: The tube body of the pressurized roasting tube (201) comprises a fixed tube body (2011) and an elastic tube body (2012); the elastic tube body (2012) is connected to the fixed tube body (2011), and the elastic tube body (2012) is optionally arranged on the upper side, lower side or horizontal side of the fixed tube body (2011); Preferably, the pressurized roasting tube (201) further comprises a piston rod (2013), the piston rod (2013) being connected to the outer side wall of the elastic tube body (2012) and controlling the expansion and contraction of the elastic tube body (2012).

4. The system according to claim 2 or 3, characterized in that: The pressurized roasting device (2) further comprises a gas circulation pipe (203); one end of the gas circulation pipe (203) is connected to the second fluidizing gas inlet (7), and the other end is connected to the gas outlet; preferably, a heating mechanism (204) and a circulation fan (205) are provided on the gas circulation pipe (203).

5. The system according to any one of claims 1 to 4, characterized in that: The system comprises 1 to 4 independent pressurized roasting devices (2), preferably 2 to 3 independent pressurized roasting devices (2); openings (5) and movable baffles (6) equal in number to the number of pressurized roasting devices (2) are provided on the side wall of the fluidized furnace tube (1); the pressurized roasting tube (201) of each pressurized roasting device (2) is connected to the inner cavity of the fluidized furnace tube (1) through its corresponding opening (5); or The system comprises a pressurized roasting device (2), wherein the pressurized roasting tube (201) is a cylindrical structure and is sleeved on the outside of the fluidized furnace tube (1).

6. The system according to any one of claims 1 to 5, characterized in that: The movable baffle (6) is a plate-shaped structure, the plate body is movably connected to the upper side wall of the opening (5), and the position state of the movable baffle (6) can be switched back and forth between covering the opening (5) or covering the cross section of the fluidizing furnace tube (1) above the opening (5); Preferably, a slide rail is provided on a side of the movable baffle (6) close to the upper side wall of the opening (5), a pulley and an angle adjustment mechanism are provided on the upper side wall of the opening (5), and the movable baffle (6) and the upper side wall of the opening (5) are connected via the pulley, the slide rail and the angle adjustment mechanism.

7. A pressurized fluidized bed roasting method or a method for using the pressurized fluidized bed roasting system according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1, adding material into the inner cavity of the fluidized furnace tube, and simultaneously passing fluidizing gas into the inner cavity of the fluidized furnace tube from the first fluidizing gas inlet below the fluidized furnace tube, so that the material forms a fluidized state in the fluidized furnace tube and the material in the fluidized furnace tube is heated; S2. When the temperature in the fluidized bed furnace tube rises to the target reaction temperature range, the upper portion of the fluidized bed furnace tube cavity is closed, and the material is blown into the pressurized roasting device using fluidizing gas; S3. After all the materials have entered the pressure roasting device, the opening is closed and the pressure roasting device is started to allow the materials to react under the target atmosphere pressure conditions. When the reaction of the materials is completed, the materials are discharged to obtain a reaction product.

8. The method according to claim 7, wherein: The material in step S1 is stone coal vanadium ore; and / or The particle size of the material is less than 3 mm, preferably less than 1 mm; and / or The fluidizing gas is oxygen or air, preferably air; and / or The flow rate of the fluidizing gas is 0.2-5 m / s, preferably 0.5-3 m / s.

9. The method according to claim 8 or 9, characterized in that: The reaction temperature in step S2 is in the range of 500-1300°C, preferably 700-1000°C.

10. The method according to any one of claims 7 to 9, characterized in that: The target atmosphere pressure in step S3 is 2 to 20 standard atmospheres, preferably 5 to 10 standard atmospheres; and / or The reaction time of the materials under pressurized conditions is 0.15~0.25h.

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