CN112588211B - Titanium dioxide plus carbon boiling chlorination simulation reactor and simulation method - Google Patents

Abstract

The invention relates to a titania carbon-added boiling chlorination simulation reactor and a simulation method. The reactor comprises a heating furnace and a reactor body; the reactor body comprises a vertical quartz tube, the quartz tube has a flared bottom end, and the inner side of the quartz tube is horizontal There is a lower sieve plate, the top of the quartz tube is equipped with an inverted funnel-shaped top cover, the top cover is fastened to the top of the quartz tube through its flared lower part, the inner cavity of the top cover is vertically penetrated, and the upper part of the top cover is horizontally There is an upper sieve plate; a furnace inlet is opened at the bottom of the heating furnace and is connected to a base through a telescopic rod, and a furnace cover seat that is adapted to the furnace inlet is raised on the base; the quartz tube is placed on the furnace cover seat and penetrates through the base and the furnace. The cover base is provided with an air inlet channel, the inner end of the air inlet channel is connected with the quartz tube, and the top of the heating furnace is provided with an exhaust pipe with adjustable vertical height, and the inner end of the exhaust pipe is located directly above the top cover and is suitable for on top of the top cover. The reactor is convenient for simulating the reaction process of titanium dioxide adding carbon boiling chlorination and obtaining more valuable parameters.

Description

Titanium dioxide plus carbon boiling chlorination simulation reactor and simulation method

technical field

The invention belongs to the technical field of solid waste treatment and recovery in metallurgy, and particularly relates to a titanium dioxide carbon-added boiling chlorination simulation reactor and a simulation method.

Background technique

Titanium oxides, especially titanium dioxide (TiO ₂ ), cannot react directly with chlorine gas, and the addition of carbon can significantly improve the progress of the chlorination reaction of TiO ₂ . Based on this, high-titanium slag rich in TiO ₂ 90% is mixed with petroleum coke (C) and boiled and chlorinated at high temperature, which has become the mainstream technology for preparing titanium tetrachloride (TiCl ₄ ). The process is a complex multiphase reaction in which gas-solid multiphase is mixed with each other. Experts and scholars at home and abroad have conducted a lot of research on it, and have successively put forward many views and speculations based on thermodynamic analysis to explain this macroscopic phenomenon, but they cannot effectively reveal In the process of carbonization and chlorination of TiO ₂ , the complex interaction between multiple phases and the influence of various factors on the chlorination reaction rate have not been well studied and the technical reference data have not been well studied.

SUMMARY OF THE INVENTION

In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a titanium dioxide carbon-added boiling chlorination simulation reactor and a simulation method, which can realize the multi-phase blending effect in the carbon-added boiling chlorination process of TiO ₂ It is convenient to study the interaction between TiO ₂ and carbon-chlorinated multi-phase, reveal the law of action affecting the rate of chlorination reaction, and adjust and control the method of chlorination reaction process, mainly in the high temperature boiling chlorination process at 850℃~1050℃ Under the conditions, the factors affecting the chlorination reaction rate of TiO ₂ and the adjustment and control methods are studied to lay a technical foundation for understanding and mastering the low-cost and high-efficiency preparation of TiCl ₄ .

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A titania plus carbon boiling chlorination simulation reactor includes a heating furnace and a reactor body that can be placed in the heating furnace; the reactor body includes a vertical quartz tube, the quartz tube has a flared bottom end and The edge of the mouth on the lower surface of the bottom end is located on a horizontal plane for stable placement, and a lower sieve plate is transversely arranged in the quartz tube to carry the reactants; the top of the quartz tube is equipped with an inverted funnel-shaped top cover, the top The cover is correspondingly buckled to the top of the quartz tube through its flared lower part, the inner cavity of the top cover is vertically penetrated to facilitate the passage of gas, and the upper part of the top cover is horizontally provided with an upper sieve plate to avoid the outflow of reactants; the heating The bottom of the furnace is provided with a furnace inlet; the bottom of the heating furnace is also connected to a base through the telescopic rod of the telescopic mechanism, and the upper surface of the base corresponds to the lower surface of the heating furnace, so that it can be close to the bottom surface of the heating furnace under the driving of the telescopic rod. The lower surface or away from the heating furnace; the base is also protruded with a furnace cover seat adapted to the furnace inlet, so that when the base is attached to the lower surface of the heating furnace, the furnace inlet can also be closed by the furnace cover seat; the quartz tube It is placed on the furnace cover seat, and an air intake channel is arranged through the base and the furnace cover seat, the inner end of the air intake channel is connected with a quartz tube, and the top of the heating furnace is provided with an exhaust pipe with adjustable vertical height. The inner end of the exhaust pipe is located just above the top cover, and the inner end of the exhaust pipe is flared and adapted to the top end of the top cover so as to be pressed and fastened and communicated with the top cover when descending.

To further improve the above technical solution, a transparent observation window is provided on the wall of the heating furnace.

Further, the heating furnace is provided with a thermocouple for monitoring the temperature in the furnace.

Further, the lower sieve plate and the upper sieve plate are both 400 mesh quartz sand sintered plates.

Further, the inner wall of the lower part of the flaring of the top cover and the top part of the corresponding quartz tube are both frosted surfaces to improve the tightness during snap-fit connection.

Further, the upper surface of the furnace cover seat is provided with a ring groove adapted to the edge of the mouth of the lower surface of the bottom end of the quartz tube, and the edge of the mouth of the lower surface of the bottom end of the quartz tube falls into the ring groove.

Further, there is a certain distance from the lower sieve plate to the lower surface of the bottom end of the quartz tube, and the inner space of the quartz tube below the lower sieve plate is formed as an air intake preheating uniform distribution area.

Further, the exhaust pipe vertically penetrates the top of the heating furnace, and the outer side wall of the exhaust pipe has a wall of the heating furnace with a screw structure adapted to each other so that the vertical height can be adjusted by rotation.

The present invention also relates to a method for simulating the boiling and chlorination of titanium dioxide by adding carbon. The valve connects the inert gas source and the chlorine gas source; the method includes the following steps:

1) Obtain the reactor body;

Open the top cover, weigh the TiO ₂ particles and the petroleum coke particles respectively, add them into the quartz tube and be carried by the lower sieve plate, and fasten the top cover;

2) Put the quartz tube on the furnace cover seat on the base opened by the telescopic rod to ensure that the inner end of the air inlet channel is connected to the quartz tube;

3) Increase the height of the exhaust pipe; then make the base fit on the lower surface of the heating furnace through the telescopic rod, the furnace cover seat closes the furnace inlet, and the quartz tube is sent into the heating furnace;

4) Lower the height of the exhaust pipe, press and fasten it on the top cover through the inner end of the flared exhaust pipe;

5) The heating furnace is heated up, and the inert gas is introduced into the heating stage according to the designed gas speed, so that the mixture composed of TiO ₂ particles and petroleum coke particles in the quartz tube is boiled and fluidized;

6) The heating furnace is heated to the temperature required for the reaction and then maintained; the inert gas is switched to chlorine gas to start the chlorination reaction; when the gas is switched, the stop valve of the inert gas source is gradually closed while the stop valve of the chlorine gas source is gradually opened. In order to keep the gas velocity into the quartz tube unchanged, to prevent the loss of flow of the mixture;

7) After the chlorination reaction is carried out according to the design time, the unreacted TiO ₂ particles and petroleum coke particles are left in the quartz tube. After cooling, take out and weigh and record the weight after the reaction. The weight after the reaction (calculated as A) Calculate the weight loss rate (BA)/B by weighing the total weight (calculated as B) in step ₁ ); Petroleum _coke particles, weigh again and record the remaining weight, and calculate the chlorination rate (DC)/ D.

To further improve the above method, in step 1), the mass ratio of TiO ₂ particles and petroleum coke particles is 3:1, and the particle sizes are respectively 200-300 mesh and 120-160 mesh, and then added into the quartz tube after mixing evenly;

In step 5), the design gas velocity is 0.15-0.25m/s;

In step 6), the temperature required for the reaction is 850°C-1050°C; the chlorine gas is evaporative chlorine gas with a concentration of 99%;

In step 7), the designed chlorination reaction time is 30min.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention is different from the conventional integrated fluidization device. The heating furnace and the reactor body are used as two separate parts, and the lifting and lowering of the telescopic rod greatly facilitates the implementation of the simulated reaction process, improves the experimental efficiency, and facilitates the follow-up. disassembly and repair.

2. The present invention adopts a visualized quartz tube, which can monitor the fluidization state in the reaction process in real time through the observation window of the heating furnace, which is beneficial to control the experimental process and make timely adjustments.

3. The bottom end of the quartz tube of the present invention has a preheating uniform distribution area reserved, which can disperse the pressure of the chlorine gas entering the quartz tube while preheating the chlorine gas to improve the accuracy of the experiment, thereby ensuring that the fluidizing gas is more uniform.

4. The exhaust pipe of the present invention is a flared external threaded pipe, which can be adapted to quartz pipes of different heights and different inner diameters by adjusting up and down, improving the universality of the heating furnace, and at the same time ensuring the unobstructed flow of the reaction gas, which is beneficial to the experiment stable.

Description of drawings

Fig. 1 is the structural representation of the titanium dioxide carbon-added boiling chlorination simulation reactor of specific embodiment;

Fig. 2 is the schematic diagram of reactor body in the specific embodiment;

Fig. 3 is the schematic diagram of the simulation reaction process of the titanium dioxide adding carbon boiling chlorination simulation reactor of specific embodiment;

Among them, the casing 1, the refractory bricks 2, the resistance wire 3, the telescopic rod 4, the base 5, the air inlet channel 6, the exhaust pipe 7, the thermocouple 8, the quartz tube 9, the lower sieve plate 10, the bottom end 11, the top cover 12, the furnace inlet 13, the furnace cover seat 14, the upper sieve plate 15, the heating furnace 100.

Detailed ways

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to Fig. 1 to Fig. 3 , the titania plus carbon boiling chlorination simulation reactor of the specific embodiment includes a heating furnace 100 and a reactor body that can be placed in the heating furnace 100; the reactor body includes a vertical quartz Tube 9, the quartz tube 9 has a bottom end 11 that is gradually flared and the mouth edge of the lower surface of the bottom end 11 is located on a horizontal plane for stable placement, and a lower sieve plate 10 is arranged in the quartz tube 9 for carrying Reactant; the top of the quartz tube 9 is equipped with an inverted funnel-shaped top cover 12, the top cover 12 is correspondingly buckled to the top of the quartz tube 9 through the lower part of its flare, and the inner cavity of the top cover 12 is vertical The upper part of the top cover 12 is provided with an upper sieve plate 15 to prevent the outflow of reactants; the bottom of the heating furnace 100 is provided with a furnace inlet 13; the bottom of the heating furnace 100 also passes through the vertical extension of the telescopic mechanism A base 5 is connected to the telescopic rod 4, and the upper surface of the base 5 corresponds to the lower surface of the heating furnace 100, so as to be close to the lower surface of the heating furnace 100 or away from the heating furnace 100 under the driving of the telescopic rod 4; the base 5 A furnace cover seat 14 adapted to the furnace inlet 13 is also protruded on the upper part, so that when the base 5 is attached to the lower surface of the heating furnace 100, the furnace inlet 13 can also be closed by the furnace cover seat 14; the quartz tube 9 is placed On the furnace cover seat 14, an air inlet channel 6 is provided through the base 5 and the furnace cover seat 14. The inner end of the air inlet channel 6 is connected to the quartz tube 9 so as to pass the test gas, and the top of the heating furnace 100 penetrates through There is an exhaust pipe 7 with a vertical height adjustable, the inner end of the exhaust pipe 7 is located directly above the top cover 12, and the inner end of the exhaust pipe 7 is flared and adapted to the top of the top cover 12 so that when descending It can be pressed and connected to the top cover 12 (quartz tube 9 ). The telescopic mechanism adopts the form of the prior art, and it is suitable to be controlled by an external electric motor. A transparent observation window (not shown in the figure) is provided on the wall of the heating furnace 100 to facilitate real-time monitoring of the fluidization state during the reaction process. The heating furnace 100 is provided with a thermocouple 8 for monitoring the temperature in the furnace. It can be understood that the wall of the heating furnace 100 usually includes the casing 1 and the refractory bricks 2 in the casing 1 . The heating furnace 100 is also provided with resistance wires 3 for heating, and the furnace cover seat 14 is also made of the refractory brick 2 material. In order to ensure the closed insulation effect. When in use, the furnace cover seat 14 is preferably truncated, the shape of the furnace inlet 13 corresponds to the truncated furnace cover seat 14, between the furnace inlet 13 and the furnace cover seat 14 or/and the upper surface of the base 5 and the lower surface of the heating furnace 100 Gaskets can also be provided in between.

Wherein, the lower sieve plate 10 and the upper sieve plate 15 are both 400 mesh quartz sand sintered plates.

Wherein, the inner wall of the flared lower part of the top cover 12 and the top part of the corresponding quartz tube 9 are both frosted surfaces to improve the tightness of the buckle connection; the inner wall of the flared inner end of the exhaust pipe 7 and the corresponding top cover 12 The top part is frosted.

Wherein, the upper surface of the furnace cover seat 14 is provided with a ring groove that is adapted to the edge of the mouth of the lower surface of the bottom end of the quartz tube 9, and the edge of the mouth of the lower surface of the bottom end of the quartz tube 9 falls in the ring groove, which can be The stability of the quartz tube 9 is improved and can play a role of placing limit. It can be understood that the inner end of the intake passage 6 is located at the center of the annular groove.

There is a certain distance from the lower sieve plate 10 to the lower surface of the bottom end of the quartz tube 9, and the inner space of the quartz tube 9 below the lower sieve plate 10 is formed as a preheating uniform distribution area for intake air. Taking the quartz tube 9 placed on the furnace cover seat 14 as an example, it is preferable that the inner end of the air inlet channel 6 is separated from the lower sieve plate 10 by a distance of two centimeters (that is, the air inlet preheating uniform distribution area), so that the gas can be introduced into the furnace. Warm up and evenly distribute.

Wherein, the exhaust pipe 7 vertically penetrates the top of the heating furnace 100 , and the outer wall of the exhaust pipe 7 has a wall of the heating furnace 100 with a screw structure adapted to each other so that the vertical height can be adjusted by rotation. It can be understood that the inner end of the exhaust pipe 7 is a conical flaring, the rotation center of the threaded structure, the axis of the conical flaring, the axis of the top cover 12, the axis of the quartz tube 9, and the intake channel 6 are all the same. axis. During implementation, the inner diameter and height dimension of the quartz tube 9 are designed according to the requirements of the relevant aspect ratio.

The present invention also provides a method for simulating the boiling and chlorination of titanium dioxide with carbon. The method is based on the above-mentioned simulated reactor for the boiling and chlorination of titanium dioxide with carbon; The cut-off valve is connected to the inert gas source and the chlorine gas source, and the outer end of the exhaust pipe 7 is connected to the lye through the pipeline; the method includes the following steps:

1) Obtain the reactor body;

Open the top cover 12, add TiO ₂ particles and petroleum coke particles into the quartz tube 9 and be carried by the lower sieve plate 10, and fasten the top cover 12;

2) Place the quartz tube 9 on the furnace cover seat 14 on the base 5 opened by the telescopic rod 4 to ensure that the inner end of the air inlet channel 6 is communicated with the quartz tube 9;

3) The height of the exhaust pipe 7 is increased; then the base 5 is attached to the lower surface of the heating furnace 100 through the telescopic rod 4, the furnace cover seat 14 closes the furnace inlet 13, and the quartz tube 9 is sent into the heating furnace 100;

4) Lower the height of the exhaust pipe 7, press and fasten the inner end of the exhaust pipe 7 to the top cover 12 to ensure that the bottom end of the quartz pipe 9 is connected to the furnace cover seat 14, and the top end of the quartz pipe 9 is connected to the top cover. 12. The sealing connection between the top of the top cover 12 and the exhaust pipe 7;

5) The heating furnace 100 is heated up, and the inert gas is introduced into the heating stage according to the designed gas velocity, so that the mixture composed of the TiO ₂ particles and the petroleum coke particles in the quartz tube 9 is boiled and fluidized;

6) The heating furnace 100 is heated up to the temperature required for the reaction and maintained; the inert gas is switched to chlorine gas to start the chlorination reaction; when the gas is switched, while gradually closing the cut-off valve of the inert gas source, gradually open the cut-off of the chlorine gas source The valve is to keep the gas velocity flowing into the quartz tube 9 unchanged to prevent the mixture from losing flow; chlorine gas can be preheated in the preheating and uniform distribution area of the intake air and evenly distributed by the lower sieve plate 10 into the reaction space of the quartz tube 9 , the upper sieve plate 15 can ensure that the TiO ₂ and the petroleum coke particles do not flow out (overflow) during the simulated boiling chlorination reaction with chlorine gas. In practice, nitrogen or argon is used as the inert gas.

7) After the chlorination reaction is carried out according to the design time, the unreacted TiO ₂ particles and petroleum coke particles are left in the quartz tube 9. After cooling, they are taken out and weighed, and the weight loss rate is calculated; the chlorination rate is calculated after burning; It is understood that the TiO ₂ particles and the petroleum coke particles in step 1) need to be weighed and recorded respectively, so that the weight loss rate and the chlorination rate can be calculated later by comparison. TiCl ₄ , CO and CO ₂ produced in the chlorination reaction process are all discharged into the lye in the form of gas from the exhaust pipe 7 to be absorbed at the reaction temperature. During the chlorination reaction process, the boiling in the quartz tube 9 can be observed in real time through the observation window. In the fluidized state, the thermocouple 8 can monitor whether the heating furnace 100 reaches and maintains the preset temperature of 850°C-1050°C.

Wherein, in step 1), the mass ratio of TiO ₂ particles and petroleum coke particles is 3:1, and the particle sizes are respectively 200-300 mesh and 120-160 mesh, which are added into the quartz tube 9 after mixing evenly;

In step 5), the design gas velocity is 0.15-0.25m/s;

In step 6), the temperature required for the reaction is 850°C-1050°C; the chlorine gas is evaporative chlorine gas with a concentration of 99%;

In step 7), the design duration is 30 minutes.

Example 1

Mix the TiO ₂ particles with a particle size of 200-300 mesh and a purity of 99% and the petroleum coke particles with a particle size of 120-160 mesh and a C content of 99% and place them in the quartz tube 9 evenly. It is sent into the heating furnace 100 , and the height of the exhaust pipe 7 is adjusted so that the top end of the top cover 12 is connected and sealed with the exhaust pipe 7 . The furnace temperature is adjusted to 900°C, and the air inlet channel 6 is fed with a nitrogen gas source in the heating stage, and the apparent gas velocity is adjusted to be 0.15 m/s, so that the mixture in the quartz tube 9 is boiled and fluidized. When the temperature rises to 900°C, the nitrogen gas is switched to chlorine gas, the gas velocity is kept constant, and the reaction time is 30 min. The TiCl ₄ , CO and CO ₂ produced by the reaction are discharged from the exhaust pipe 7 into the lye for absorption in the form of gas, and the unreacted TiO ₂ and petroleum coke are left in the quartz tube 9. After cooling, they are taken out and weighed, and their weight loss is calculated. The chlorination rate can be calculated after burning the petroleum coke, see Table 1.

Embodiment 2

Mix the TiO ₂ particles with a particle size of 200-300 mesh and a purity of 99% and the petroleum coke particles with a particle size of 120-160 mesh and a C content of 99% and place them in the quartz tube 9 evenly. It is sent into the heating furnace 100 , and the height of the exhaust pipe 7 is adjusted so that the top end of the top cover 12 is connected and sealed with the exhaust pipe 7 . The furnace temperature is adjusted to 900°C, the air inlet channel 6 is fed with a nitrogen gas source in the heating stage, and the apparent gas velocity is adjusted to be 0.20 m/s, so that the mixture in the quartz tube 9 is boiled and fluidized. When the temperature rises to 900°C, the nitrogen gas is switched to chlorine gas, the gas velocity is kept constant, and the reaction time is 30 min. The TiCl ₄ , CO and CO ₂ produced by the reaction are discharged from the exhaust pipe 7 into the lye for absorption in the form of gas, and the unreacted TiO ₂ and petroleum coke are left in the quartz tube 9. After cooling, they are taken out and weighed, and their weight loss is calculated. The chlorination rate can be calculated after burning the petroleum coke, see Table 1.

Embodiment 3

Mix the TiO ₂ particles with a particle size of 200-300 mesh and a purity of 99% and the petroleum coke particles with a particle size of 120-160 mesh and a C content of 99% and place them in the quartz tube 9 evenly. It is sent into the heating furnace 100 , and the height of the exhaust pipe 7 is adjusted so that the top end of the top cover 12 is connected and sealed with the exhaust pipe 7 . The furnace temperature is adjusted to 900°C, the air inlet channel 6 is fed with a nitrogen gas source in the heating stage, and the apparent gas velocity is adjusted to be 0.25 m/s, so that the mixture in the quartz tube 9 is boiled and fluidized. When the temperature rises to 900°C, the nitrogen gas is switched to chlorine gas, the gas velocity is kept constant, and the reaction time is 30 min. The TiCl ₄ , CO and CO ₂ produced by the reaction are discharged from the exhaust pipe 7 into the lye for absorption in the form of gas, and the unreacted TiO ₂ and petroleum coke are left in the quartz tube 9. After cooling, they are taken out and weighed, and their weight loss is calculated. The chlorination rate can be calculated after burning the petroleum coke, see Table 1.

Table 1

Weight loss % Chlorination rate% Example 1 81.03 90.43 Embodiment 2 82.82 93.27 Embodiment 3 86.60 98.49

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. The titanium dioxide carbonization boiling chlorination simulation reactor comprises a heating furnace and a reactor body which can be arranged in the heating furnace; the method is characterized in that: the reactor body comprises a vertical quartz tube, the quartz tube is provided with a flared bottom end, the edge of an opening part of the lower surface of the bottom end is positioned on a horizontal plane so as to be placed stably, and a lower sieve plate is transversely arranged in the quartz tube and used for bearing reactants; the top end of the quartz tube is provided with an inverted funnel-shaped top cover, the top cover is correspondingly buckled at the top end of the quartz tube through the lower part of the flaring of the top cover, the inner cavity of the top cover is vertically communicated so as to facilitate the gas to pass through, and an upper sieve plate is transversely arranged in the upper part of the top cover so as to avoid the outflow of reactants;

the bottom of the heating furnace is provided with a furnace inlet; the bottom of the heating furnace is also connected with a base through a telescopic rod of a telescopic mechanism, and the upper surface of the base corresponds to the lower surface of the heating furnace so as to be close to the lower surface of the heating furnace or far away from the heating furnace under the driving of the telescopic rod; a furnace cover seat matched with the furnace inlet is convexly arranged on the base, so that the furnace inlet can be sealed through the furnace cover seat when the base is attached to the lower surface of the heating furnace;

the quartz capsule is arranged in on the bell seat, run through base and bell seat are equipped with inlet channel, and inlet channel's the inner intercommunication quartz capsule, and the top of heating furnace is run through and is equipped with vertical height-adjustable's blast pipe, and the inner of blast pipe is located the top cap directly over, and the inner flaring of blast pipe and adaptation are in order can compress tightly lock and intercommunication top cap when descending in the top of top cap.

2. The titanium dioxide carbo-boiling chlorination simulated reactor as claimed in claim 1, wherein: the wall of the heating furnace is provided with a transparent observation window.

3. The titanium dioxide carbo-boiling chlorination simulated reactor as claimed in claim 1, wherein: the heating furnace is provided with a thermocouple for monitoring the temperature in the furnace.

4. The titanium dioxide carbo-boiling chlorination simulated reactor as claimed in claim 1, wherein: the lower sieve plate and the upper sieve plate are both 400-mesh quartz sand sintered plates.

5. The titanium dioxide carbo-boiling chlorination simulated reactor as claimed in claim 1, wherein: the inner wall of the lower part of the top cover flaring and the top end part of the corresponding quartz tube are frosted surfaces so as to improve the sealing performance during buckling connection.

6. The titanium dioxide carbo-boiling chlorination simulated reactor as claimed in claim 1, wherein: the upper surface of the furnace cover seat is provided with an annular groove which is matched with the edge of the opening part of the lower surface of the bottom end of the quartz tube, and the edge of the opening part of the lower surface of the bottom end of the quartz tube falls into the annular groove.

7. The titanium dioxide carbo-boiling chlorination simulated reactor as claimed in claim 1, wherein: the lower sieve plate has a certain distance to the lower surface of the bottom end of the quartz tube, and the inner space of the quartz tube below the lower sieve plate forms an air inlet preheating uniform distribution area.

8. The titanium dioxide carbo-boiling chlorination simulated reactor as claimed in claim 1, wherein: the exhaust pipe vertically penetrates through the top of the heating furnace, and the wall of the heating furnace on the outer side wall of the exhaust pipe is of a thread structure matched with each other so that the vertical height can be adjusted through rotation.

9. A titanium dioxide carbo-boiling chlorination simulation method, which is carried out based on the titanium dioxide carbo-boiling chlorination simulation reactor of any one of claims 1 to 8; the outer end of the air inlet channel is connected with a tee joint, and the tee joint is also connected with an inert gas source and a chlorine gas source through stop valves respectively; the method comprises the following steps:

1) obtaining a reactor body;

opening the top cover and adding TiO₂Adding the particles and petroleum coke particles into a quartz tube, carrying the particles by a lower sieve plate, and buckling a top cover;

2) placing the quartz tube on a furnace cover seat on a base opened through a telescopic rod, and ensuring that the inner end of the air inlet channel is communicated with the quartz tube;

3) heightening the height of the exhaust pipe; then the base is attached to the lower surface of the heating furnace through the telescopic rod, the furnace cover seat closes the inlet of the heating furnace, and the quartz tube is sent into the heating furnace;

4) the height of the exhaust pipe is reduced, and the exhaust pipe is pressed and buckled on the top cover through the inner end of the flaring of the exhaust pipe;

5) heating the heating furnace, and introducing inert gas at the designed gas speed in the heating stage to ensure that TiO in the quartz tube₂The mixture of the particles and the petroleum coke particles is fluidized;

6) heating the heating furnace to the temperature required by the reaction and then keeping the temperature; switching the inert gas into chlorine gas, and starting chlorination reaction; when the gas is switched, the stop valve of the inert gas source is gradually closed, and simultaneously, the stop valve of the chlorine gas source is gradually opened to keep the gas speed introduced into the quartz tube unchanged, so that the mixture is prevented from flowing out;

7) after chlorination reaction is carried out according to designed time length, unreacted TiO₂Keeping the particles and petroleum coke particles in a quartz tube, cooling, taking out, weighing and calculating the weight loss rate; calculating the chlorination rate after ignition.

10. The titanium dioxide carbonation boiling chlorination simulation method according to claim 9, wherein: in step 1), TiO₂The mass ratio of the particles to the petroleum coke particles is 3:1, the particle sizes are respectively 200-mesh and 300-mesh and 120-mesh and 160-mesh, and the particles and the petroleum coke particles are uniformly mixed and then added into a quartz tube;

in the step 5), the designed gas velocity is 0.15-0.25 m/s;

in the step 6), the temperature required by the reaction is 850-1050 ℃; the chlorine gas is evaporated chlorine gas with the concentration of 99 percent;

in step 7), the designed chlorination reaction time is 30 min.

Images