阅读说明：本技术 除钒泥浆处理装置及工艺 (Vanadium-removing slurry treatment device and process ) 是由 胡元金 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种除钒泥浆处理装置及工艺,属于四氯化钛生产技术领域。所述的除钒泥浆处理装置,包括串联设置的旋风收尘器和重力收尘器,并且在重力收尘器上设置有除钒泥浆端口,在进泥浆端口处设置有喷嘴,所述喷嘴用于将除钒泥浆喷射至重力收尘器内。所述的除钒泥浆处理工艺,即为所述除钒泥浆处理装置进行具体处理的工艺方法。本发明通过同时设置串联结合的旋风收尘器和重力收尘器,可通过旋风收尘器先对氯化炉烟气中的粉尘进行旋风除尘,然后再通入重力收尘器中利用氯化炉烟气的热量实现除钒泥浆的蒸发分离,进而实现对除钒泥浆中的四氯化钛与固体杂质的分离以及直接回收利用,避免了氯化炉烟气中的粉尘对钒渣的污染问题。(The invention discloses a vanadium-removing slurry treatment device and a vanadium-removing slurry treatment process, and belongs to the technical field of titanium tetrachloride production. The vanadium removing slurry treatment device comprises a cyclone dust collector and a gravity dust collector which are arranged in series, wherein a vanadium removing slurry port is formed in the gravity dust collector, a nozzle is arranged at the slurry inlet port, and the nozzle is used for spraying vanadium removing slurry into the gravity dust collector. The vanadium-removing slurry treatment process is a process method for carrying out specific treatment on the vanadium-removing slurry treatment device. According to the invention, the cyclone dust collector and the gravity dust collector which are combined in series are arranged at the same time, so that dust in the flue gas of the chlorination furnace can be subjected to cyclone dust removal through the cyclone dust collector, and then the flue gas is introduced into the gravity dust collector to realize evaporation separation of vanadium-removing slurry by using the heat of the flue gas of the chlorination furnace, and then the separation and direct recycling of titanium tetrachloride and solid impurities in the vanadium-removing slurry are realized, so that the pollution problem of the dust in the flue gas of the chlorination furnace to vanadium slag is avoided.)

1. Remove vanadium mud processing apparatus, its characterized in that: comprises a cyclone dust collector (1) and a gravity dust collector (2), wherein the cyclone dust collector (1) is provided with a first air inlet port (3), a first air outlet port (4) and a first dust outlet port (5), the gravity dust collector (2) is provided with a mud inlet port (6), a second air inlet port (7), a second air outlet port (8) and a second dust outlet port (9), the first air inlet port (3) is communicated with a flue gas pipeline of the chlorination furnace to supply the flue gas of the chlorination furnace into the cyclone dust collector (1), the first air outlet port (4) is communicated with the second air inlet port (7), the slurry inlet port (6) is communicated with a vanadium removing slurry supply pipeline to supply vanadium removing slurry into the gravity dust collector (2), and a nozzle (10) is arranged at the slurry inlet (6), and the nozzle (10) is used for spraying vanadium-removing slurry into the gravity dust collector (2).

2. The vanadium removal mud treatment device of claim 1, wherein: the method is characterized in that: the nozzle (10) is used for supplying vanadium removal slurry into the gravity dust collector (2) in a spraying state.

3. The vanadium removal mud treatment device of claim 1, wherein: the nozzle (10) is a spiral nozzle.

4. The vanadium removal mud treatment device of claim 1, wherein: the first air inlet port (3) is positioned on the side of the upper part of the cyclone dust collector (1), the first air outlet port (4) is positioned at the top end of the cyclone dust collector (1), and the first dust outlet port (5) is positioned at the bottom end of the cyclone dust collector (1); advance mud port (6) and be located the top of gravity dust collector (2), remove vanadium mud and adopt from the top to spout into in gravity dust collector (2), second air inlet port (7) are located the side of gravity dust collector (2), second air-out port (8) are located the side of gravity dust collector (2), second goes out dirt port (9) and is located gravity dust collector (2) bottom.

5. The vanadium removal mud treatment device of claim 4, wherein: the gravity dust collector (2) comprises an upper cylindrical barrel (11) and a lower conical barrel (12), and the second air inlet port (7) and the second air outlet port (8) are arranged on the peripheral side wall of the cylindrical barrel (11); in the height direction of the gravity dust collector (2), the second air inlet port (7) is positioned above the second air outlet port (8), and the second air inlet port (7) and the second air outlet port (8) are respectively arranged on two opposite sides of the gravity dust collector (2).

6. The vanadium removal mud treatment apparatus according to any one of claims 1 to 5, wherein: the air conditioner further comprises a condenser (13), and the second air outlet port (8) is communicated with the condenser (13).

7. The vanadium removal mud treatment process comprises the vanadium removal mud treatment device of any one of the claims 1 to 6, and is characterized in that: the first air inlet port (3) is communicated with a flue gas pipeline of a chlorination furnace, and the slurry inlet port (6) is communicated with a vanadium-removing slurry supply pipeline; the vanadium removing slurry treatment process comprises the following steps:

the method comprises the following steps that chloridizing furnace flue gas enters a cyclone dust collector (1) from a first air inlet port (3) for cyclone dust collection, and dust in the chloridizing furnace flue gas is collected to the bottom in the cyclone dust collector (1) and can be discharged through a first dust outlet port (5);

the chlorination furnace flue gas after cyclone dust removal is discharged from a first air outlet port (4) and enters a gravity dust collector (2) through a second air inlet port (7), and vanadium-removing slurry sprayed into the gravity dust collector (2) through a nozzle (10) at a slurry inlet port (6) contacts with the gravity dust collector (2) to transfer heat so as to evaporate titanium tetrachloride liquid components in the vanadium-removing slurry into titanium tetrachloride gas;

titanium tetrachloride gas formed by evaporation and chlorination furnace flue gas are discharged from a second air outlet (8);

solid impurities in the vanadium-removed slurry are enriched into vanadium slag at the bottom of the gravity dust collector (2), and the enriched vanadium slag can be discharged through the second dust outlet (9).

8. The vanadium removal mud treatment process of claim 7, wherein: the temperature of the flue gas at the second air outlet (8) is controlled to be 200-250 ℃ by adjusting the supply amount of vanadium removing slurry.

9. The vanadium removal mud treatment process of claim 8, wherein: the mass ratio of the supply amount of the vanadium-removing slurry to the supply amount of the chlorination furnace flue gas is 5-8%.

10. The vanadium removal mud treatment process according to any one of claims 7 to 9, wherein: the temperature of the chlorination furnace flue gas entering from the first air inlet port (3) is 450-550 ℃, and the air inlet speed is 15-20 m/s; the speed of vanadium-removing slurry sprayed from the nozzle (10) at the slurry inlet port (6) is 2-3 m/s.

Technical Field

The invention relates to the technical field of titanium tetrachloride production, in particular to a vanadium-removing slurry treatment device and a vanadium-removing slurry treatment process adopting the treatment device.

Background

In the production process of the fine titanium tetrachloride, aluminum powder or fatty acid is used for removing impurities in the crude titanium tetrachloride to obtain the fine titanium tetrachloride, and the impurities enter vanadium removal slurry. The vanadium-removing mud contains about 5 to 10 mass percent of solids and the balance of titanium tetrachloride liquid. In the traditional process, an ore pulp evaporation furnace is adopted to treat vanadium-removing slurry, the vanadium-removing slurry is injected into a crucible of the ore pulp evaporation furnace, power is supplied for heating, titanium tetrachloride is evaporated and condensed for recycling, and vanadium slag is formed after solid impurities are enriched; the mass ratio of the vanadium element in the vanadium slag is generally between 15 and 20 percent, so the vanadium content of the vanadium slag has higher quality and can be used as a raw material for extracting vanadium in downstream procedures so as to achieve the aim of recycling. Although the mode of evaporation recovery by using the ore pulp evaporation furnace can treat vanadium-removing slurry and recover titanium tetrachloride, a large amount of electric energy is consumed as an evaporation heat source, so that the cost is high.

In recent years, the vanadium removal slurry is directly returned to a dust collector of a chlorination process, the heat of the flue gas of a chlorination furnace is utilized to separate solid impurities in the vanadium removal slurry, and liquid titanium tetrachloride is evaporated into a gas state and enters the next process for recovery. However, in the process, the vanadium slag produced by the vanadium removal slurry is directly mixed with dust in the flue gas of the chlorination furnace, so that the vanadium content of the dust collecting slag is reduced, the value of continuous utilization is lost, and the recovery and utilization of vanadium in solid impurities in the vanadium removal slurry cannot be achieved.

In addition, there is also reported a process of spraying a circulating bath slurry on a flue gas pipe at the outlet of a chlorination furnace. However, the process only considers the separation of the solid impurities in the slurry and the recovery of titanium tetrachloride, and the subsequent recycling condition of vanadium in the solid impurities in the vanadium-removing slurry is not considered.

Disclosure of Invention

The technical problem solved by the invention is as follows: provided is a vanadium removal slurry treatment device which can reduce energy consumption, can realize the separation of titanium tetrachloride and solid impurities in vanadium removal slurry, and can directly recycle the separated titanium tetrachloride and solid impurities.

The technical scheme adopted by the invention for solving the technical problems is as follows: vanadium removing mud processing apparatus, including cyclone and gravity dust collector, have first air inlet port, first air-out port and first dirt port on cyclone, have into mud port, second air inlet port, second air-out port and second dirt port on gravity dust collector, first air inlet port is used for with chlorination furnace flue gas pipeline intercommunication in order to supply with chlorination furnace flue gas to cyclone, first air outlet port and second air inlet port intercommunication, advance mud port and vanadium removing mud supply line intercommunication in order to supply with vanadium removing mud to gravity dust collector to be provided with the nozzle at the mud inlet port department, the nozzle is used for spraying vanadium removing mud to gravity dust collector in.

Further, the method comprises the following steps: the nozzle is used for supplying vanadium removal slurry to the gravity dust collector in a spraying state.

Further, the method comprises the following steps: the nozzle is a spiral nozzle.

Further, the method comprises the following steps: the first air inlet port is positioned on the side of the upper part of the cyclone dust collector, the first air outlet port is positioned at the top end of the cyclone dust collector, and the first dust outlet port is positioned at the bottom end of the cyclone dust collector; the inlet mud port is located at the top end of the gravity dust collector, vanadium-removing mud is sprayed into the gravity dust collector from top to bottom, the second inlet air port is located on the side of the gravity dust collector, the second outlet air port is located on the side of the gravity dust collector, and the second outlet dust port is located at the bottom end of the gravity dust collector.

Further, the method comprises the following steps: the gravity dust collector comprises an upper cylindrical barrel and a lower conical barrel, and the second air inlet port and the second air outlet port are both arranged on the peripheral side wall of the cylindrical barrel; in the height direction of the gravity dust collector, the second air inlet port is positioned above the second air outlet port, and the second air inlet port and the second air outlet port are respectively arranged on two opposite sides of the gravity dust collector.

Further, the method comprises the following steps: still include the condenser, second air-out port and condenser intercommunication.

In addition, the invention also provides a vanadium removing slurry treatment process, and by adopting the vanadium removing slurry treatment device, the first air inlet port is communicated with the flue gas pipeline of the chlorination furnace, and the slurry inlet port is communicated with the vanadium removing slurry supply pipeline; the vanadium removing slurry treatment process comprises the following steps:

the method comprises the following steps that chloridizing furnace flue gas enters a cyclone dust collector from a first air inlet port to be subjected to cyclone dust collection, and dust in the chloridizing furnace flue gas is collected to the bottom in the cyclone dust collector and can be discharged through a first dust outlet port;

the chlorination furnace flue gas after cyclone dust removal is discharged from a first air outlet port and enters a gravity dust collector through a second air inlet port, and vanadium-removing slurry sprayed into the gravity dust collector through a nozzle at a slurry inlet port is contacted with the gravity dust collector to transfer heat so as to evaporate titanium tetrachloride liquid components in the vanadium-removing slurry into titanium tetrachloride gas;

titanium tetrachloride gas formed by evaporation and chlorination furnace flue gas are discharged from a second air outlet;

solid impurities in the vanadium-removing slurry are enriched into vanadium slag at the bottom of the gravity dust collector, and the enriched vanadium slag can be discharged through the second dust outlet.

Further, the method comprises the following steps: and controlling the temperature of the flue gas at the second air outlet port to be 200-250 ℃ by adjusting the supply amount of vanadium removing slurry.

Further, the method comprises the following steps: the mass ratio of the supply amount of the vanadium-removing slurry to the supply amount of the chlorination furnace flue gas is 5-8%.

Further, the method comprises the following steps: the temperature of the chlorination furnace flue gas entering from the first air inlet port is 450-550 ℃, and the air inlet speed is 15-20 m/s; the speed of vanadium-removing slurry sprayed from a nozzle at the slurry inlet port is 2-3 m/s.

The invention has the beneficial effects that: according to the vanadium removal slurry treatment device, the cyclone dust collector and the gravity dust collector which are combined in series are arranged at the same time, dust in the flue gas of the chlorination furnace can be subjected to cyclone dust removal through the cyclone dust collector, then the dust is introduced into the gravity dust collector, the heat of the flue gas of the chlorination furnace is utilized in the gravity dust collector to realize evaporation separation of the vanadium removal slurry by utilizing the heat of the flue gas of the chlorination furnace, evaporated titanium tetrachloride is collected after being discharged along with the flue gas, and unevaporated solid impurities are enriched into vanadium slag at the bottom of the gravity dust collector, so that the separation and recycling of the titanium tetrachloride and the solid impurities in the vanadium removal slurry are realized. Meanwhile, the waste heat of the flue gas of the chlorination furnace is directly utilized, so that the condition of additional energy consumption is avoided, and compared with the traditional ore pulp evaporation furnace treatment mode, the energy consumption condition can be effectively reduced. In addition, the dust in the flue gas of the chlorination furnace is separated and collected by the cyclone dust collector, so that the pollution to the vanadium slag enriched at the bottom of the gravity dust collector can be avoided, the vanadium content of the enriched vanadium slag can be further ensured, and the vanadium-containing slag can be directly used as a raw material for recycling vanadium resources in the vanadium slag. In addition, the vanadium removal slurry treatment process realizes the separation of titanium tetrachloride and solid impurities in the vanadium removal slurry and the respective recycling of the separated titanium tetrachloride and the separated solid impurities by adopting the treatment device; and moreover, the flue gas of the chlorination furnace and the vanadium removal slurry are regulated and controlled, so that effective evaporation and separation of titanium tetrachloride liquid components in the vanadium removal slurry are ensured, and energy can be saved to the maximum extent.

Drawings

FIG. 1 is a schematic connection diagram of a vanadium removal slurry treatment device according to the present invention;

labeled as: the dust collector comprises a cyclone dust collector 1, a gravity dust collector 2, a first air inlet port 3, a first air outlet port 4, a first dust outlet port 5, a slurry inlet port 6, a second air inlet port 7, a second air outlet port 8, a second dust outlet port 9, a nozzle 10, an upper cylindrical barrel 11, a lower conical barrel 12 and a condenser 13.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1, the vanadium removal slurry treatment device comprises a cyclone dust collector 1 and a gravity dust collector 2, wherein the cyclone dust collector 1 is provided with a first air inlet port 3, a first air outlet port 4 and a first dust outlet port 5, the gravity dust collector 2 is provided with a slurry inlet port 6, a second air inlet port 7, a second air outlet port 8 and a second dust outlet port 9, the first air inlet port 3 is used for being communicated with a chlorinator flue gas pipeline to supply chlorinator flue gas into the cyclone dust collector 1, the first air outlet port 4 is communicated with the second air inlet port 7, the slurry inlet port 6 is communicated with a vanadium removal slurry supply pipeline to supply vanadium removal slurry into the gravity dust collector 2, and a nozzle 10 is arranged at the slurry inlet port 6, and the nozzle 10 is used for injecting the vanadium removal slurry into the gravity dust collector 2.

The cyclone dust collector 1 has the function of separating dust in the flue gas of the chlorination furnace by using a cyclone separation principle, so that the content of the dust in the flue gas supplied to the gravity dust collector 2 after separation is greatly reduced, the dust in the flue gas is prevented from being mixed with solid impurities in vanadium-removing slurry 1 in the gravity dust collector 2 to reduce the content of vanadium elements in deposited vanadium slag, the vanadium-containing quality of the vanadium slag can be ensured, the vanadium content of the vanadium slag can reach 15% -20%, the vanadium slag can be used as an ideal raw material for preparing commercial vanadium in subsequent processes, and the vanadium slag can be directly recycled.

In addition, the gravity dust collector 2 of the invention has the functions of collecting dust by gravity on one hand, and collecting solid matters in gas by gravity; on the other hand, the vanadium removal slurry is sprayed into the gravity dust collector 2 through the nozzle 10, and meanwhile, the chlorination furnace flue gas introduced through the second air inlet port 7 can be used for quickly evaporating the titanium tetrachloride liquid in the sprayed vanadium removal slurry so as to quickly separate the titanium tetrachloride and the solid impurities in the vanadium removal slurry.

More preferably, in order to improve the contact heat transfer of the flue gas of the chlorination furnace and the sprayed vanadium removal slurry so as to improve the evaporation effect of the titanium tetrachloride liquid component in the flue gas, the nozzle 10 adopted in the invention is preferably capable of supplying the vanadium removal slurry into the gravity dust collector 2 in a spraying state; that is, the nozzle 10 is preferably an atomizing nozzle type product, and for example, a spiral nozzle can be specifically used.

In addition, without loss of generality, by combining the structure and cyclone separation principle of the conventional cyclone dust collector 1 and referring to the attached drawing 1, a first air inlet port 3 in the cyclone dust collector 1 is positioned on the side of the upper part of the cyclone dust collector 1, a first air outlet port 4 is positioned at the top end of the cyclone dust collector 1, and a first dust outlet port 5 is positioned at the bottom end of the cyclone dust collector 1; and, still can be provided with corresponding on-off valve at first dust outlet port 5 department to open the valve when needing to get rid of the dust of collection and discharge, and when the dust of need not arranging, close the valve.

In addition, for the gravity dust collector 2, in order to perform corresponding structural improvement on the conventional gravity dust collector 2, specifically referring to fig. 1, a slurry inlet port 6 is positioned at the top end of the gravity dust collector 2, that is, a corresponding slurry inlet port 6 is arranged at the top end of the gravity dust collector 2 to supply vanadium removal slurry into the gravity dust collector 2, and the vanadium removal slurry is sprayed into the gravity dust collector 2 from top to bottom; for the arrangement of other ports, a second air inlet port 7 can be arranged on the side of the gravity dust collector 2, a second air outlet port 8 is also arranged on the side of the gravity dust collector 2, a second dust outlet port 9 is arranged at the bottom end of the gravity dust collector 2, and a corresponding switch valve can be arranged at the second dust outlet port 9, so that the valve can be opened to discharge when vanadium slag at the bottom in the gravity dust collector 2 needs to be discharged, and the valve can be closed when the vanadium slag does not need to be discharged.

More specifically, it is further preferable in the present invention that the gravity dust collector 2 includes an upper cylindrical barrel 11 and a lower conical barrel 12; at this time, the second air inlet port 7 and the second air outlet port 8 can be both arranged on the peripheral side wall of the cylindrical barrel 11; in the height direction of the gravity dust collector 2, the second air inlet port 7 is positioned above the second air outlet port 8, and the second air inlet port 7 and the second air outlet port 8 are respectively arranged on two opposite sides of the gravity dust collector 2; such as the positional relationship specifically shown in fig. 1. Therefore, the flue gas entering from the second air inlet port 7 and being discharged from the second air outlet port 8 can be more fully contacted with the sprayed vanadium removal slurry in the gravity dust collector 2 for heat transfer, and the evaporation effect of titanium tetrachloride in the vanadium removal slurry is further improved.

More specifically, the vanadium-removing slurry treatment device is further provided with a condenser 13 in a matching manner, and the second air outlet port 8 is communicated with the condenser 13; the flue gas discharged from the second air outlet port 8 can be condensed and cooled by the condenser 13, so that the titanium tetrachloride gas in the flue gas is condensed into liquid and then is recovered in a centralized manner.

According to the vanadium-removing slurry treatment process, namely the vanadium-removing slurry treatment device disclosed by the invention is adopted, the first air inlet port 3 is communicated with the flue gas pipeline of the chlorination furnace so as to introduce the flue gas of the chlorination furnace into the cyclone dust collector 1, and meanwhile, the slurry inlet port 6 is communicated with the vanadium-removing slurry supply pipeline so as to introduce the vanadium-removing slurry into the gravity dust collector; the specific vanadium-removing slurry treatment process comprises the following steps:

the method comprises the following steps that chloridizing furnace flue gas enters a cyclone dust collector 1 from a first air inlet port 3 for cyclone dust collection, and dust in the chloridizing furnace flue gas is collected to the bottom in the cyclone dust collector 1 and can be discharged through a first dust outlet port 5;

the chlorination furnace flue gas after cyclone dust removal is discharged from a first air outlet port 4 and enters a gravity dust collector 2 through a second air inlet port 7, and vanadium-removing slurry sprayed into the gravity dust collector 2 through a nozzle 10 at a slurry inlet port 6 contacts the gravity dust collector 2 to transfer heat so as to evaporate titanium tetrachloride liquid components in the vanadium-removing slurry into titanium tetrachloride gas;

titanium tetrachloride gas formed by evaporation and chlorination furnace flue gas are discharged from a second air outlet port 8;

solid impurities in the vanadium-removed slurry are enriched into vanadium slag at the bottom of the gravity dust collector 2, and the enriched vanadium slag can be discharged through the second dust outlet 9.

After the treatment, the dust in the chlorination furnace flue gas is separated and collected by the cyclone dust collector 1, so that the dust content in the flue gas discharged from the first dust outlet 5 is extremely low, the pollution to the vanadium slag enriched at the bottom of the gravity dust collector 2 is avoided, the vanadium content of the enriched vanadium slag can be further ensured, and the enriched vanadium slag can be further used as a raw material for recycling the vanadium resource in the vanadium slag. After the flue gas is sent into the gravity dust collector 2, the residual heat of the flue gas is directly utilized to evaporate the titanium tetrachloride liquid in the vanadium removing slurry, and the evaporated titanium tetrachloride gas is discharged from the second air outlet port 8 along with the flue gas, so that the separation of the titanium tetrachloride and the solid impurities in the vanadium removing slurry is realized. Meanwhile, the solid impurities in the vanadium-removing slurry have high vanadium content and are not polluted by dust in the flue gas of the chlorination furnace, so the solid impurities enriched at the bottom of the gravity dust collector 2 form vanadium slag with the vanadium content of 15-20%, and the vanadium slag can be used as an ideal raw material for preparing commodity vanadium in the subsequent process, thereby realizing the recycling of the vanadium slag.

Of course, without loss of generality, in order to further condense and recover titanium tetrachloride gas in the gas discharged from the second air outlet port 8; the gas temperature is further reduced by further arranging a condenser 13 to realize the condensation of the titanium tetrachloride gas, and the condensed liquid titanium tetrachloride is intensively recycled for subsequent storage and recycling.

More specifically, in order to ensure effective evaporation of titanium tetrachloride liquid in vanadium removal slurry, the invention further can control the flue gas temperature at the second air outlet port 8 to be 200-250 ℃ by adjusting the supply amount of the vanadium removal slurry in the actual treatment process; namely, the temperature of the flue gas at the second air outlet port 8 is controlled to be used as a control parameter for controlling whether the titanium tetrachloride liquid component in the vanadium removing slurry is fully evaporated.

In addition, for the flue gas of the chlorination furnace, the main components are generally as follows: n in a volume ratio of 10-20%₂70 to 85 percent of TiCl by volume ratio₄1-2% of Cl by volume ratio₂HCl with the volume ratio of 2-3 percent and CO with the volume ratio of 3-8 percent₂1-5% of solid impurities by mass; the vanadium-removing mud generally comprises the following main components: the vanadium-removing mud contains about 5 to 10 mass percent of solids and the balance of titanium tetrachloride liquid. The process parameters of the chlorination furnace flue gas and the process parameters of the vanadium removing slurry are combined, the supply amount of the vanadium removing slurry and the supply amount of the chlorination furnace flue gas are preferably set to be 5-8% by mass, and the flue gas temperature at the second air outlet port 8 can be reasonably set according to the control requirement of 200-250 ℃.

Without loss of generality, by combining parameters of the chlorination furnace flue gas entering the first air inlet port 3, the following specific process parameter settings are preferred in the invention: the temperature is controlled to be 450-550 ℃, and the air inlet speed is controlled to be 15-20 m/s. After the flue gas is subjected to cyclone separation of the cyclone dust collector 1, the temperature of the flue gas discharged to the second air inlet port 7 is reduced to 350-450 ℃ approximately due to the natural temperature reduction effect of the wall of the cyclone dust collector. Therefore, the temperature parameter is controlled to ensure effective vaporization and separation of the titanium tetrachloride liquid component in the vanadium removal slurry.

More specifically, in order to ensure the spraying effect of the vanadium removing slurry after entering the gravity dust collector 2, the speed of the vanadium removing slurry sprayed from the nozzle 10 at the slurry inlet port 6 is preferably set to be 2m/s to 3 m/s.