Continuous premixing device of mineral acid for titanium dioxide production
By adopting a continuous premixing device with a reverse spiral blade design in titanium dioxide production, the problems of uneven mixing and agglomeration of titanium ore powder and concentrated sulfuric acid are solved, and efficient mixing and continuous production are achieved.
Patent Information
- Application Number
- CN202510750170.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-10-03
AI Technical Summary
In the prior art, the mixing of titanium ore powder and concentrated sulfuric acid easily produces agglomeration, resulting in uneven mixing and a long mixing cycle, which is not conducive to continuous production.
A continuous premixing device for mineral acid used in titanium dioxide production is adopted. The reverse spiral design of the main conveying blades, outer conveying blades and inner conveying blades is utilized, combined with an inclined mixing chamber structure, to achieve uniform mixing of titanium ore powder and concentrated sulfuric acid, and the conveying speed of the mixed material is controlled by reverse conveying.
It effectively avoids the agglomeration of mixed materials in the mixing chamber, improves mixing uniformity, shortens mixing time, and adapts to continuous production needs.
Smart Images
Figure CN120733602A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of sulfuric acid method titanium dioxide production, and in particular to a continuous premixing device for mineral acid used in titanium dioxide production. Background Art
[0002] In the sulfuric acid method for producing titanium dioxide, the ground titanium ore powder needs to be mixed with concentrated sulfuric acid first. The mixture formed after sufficient mixing is then subjected to an acidolysis reaction under the action of an initiating acid or water.
[0003] In existing production processes, titanium ore powder and concentrated sulfuric acid are often mixed by first placing a certain amount of concentrated sulfuric acid in a tank, then adding a corresponding amount of titanium ore powder according to a predetermined acid-ore ratio, and then stirring and mixing. This acid-ore mixing method is prone to agglomeration, resulting in uneven mixing. It also requires a long mixing cycle for the concentrated sulfuric acid and titanium ore powder, making it unsuitable for continuous production. Summary of the Invention
[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a continuous premixing device for mineral acid used in titanium dioxide production, comprising a feeding mechanism, wherein the output end of the feeding mechanism is connected to a mixing device, and the output end of the mixing device is connected to an overflow chamber, wherein the mixing device comprises a mixing chamber, wherein a main conveying blade is coaxially arranged in the mixing chamber, wherein an outer conveying blade and an inner conveying blade are coaxially arranged on the main conveying blade, wherein the main conveying blade, the outer conveying blade and the inner conveying blade are all arranged in a spiral shape, wherein the spiral direction of the outer conveying blade and the inner conveying blade is the same, and the spiral direction of the main conveying blade is opposite to the spiral direction of the outer conveying blade and the inner conveying blade, wherein the outer conveying blade and the inner conveying blade are respectively located on the outer side and the inner side of the diameter direction of the main conveying blade, and wherein the main conveying blade, the outer conveying blade and the inner conveying blade rotate synchronously.
[0005] Preferably, the feeding mechanism includes two metering silos and a mineral powder conveyor, the two metering silos are arranged at the feeding end of the mineral powder conveyor for alternately feeding materials to the mineral powder conveyor, and the discharging end of the mineral powder conveyor is connected to the feeding end of the mixing chamber.
[0006] Preferably, an acid inlet is provided at the point where the mineral powder conveyor and the mixing chamber are connected.
[0007] Preferably, the mixing chamber is arranged at an angle, and the feeding end of the mixing chamber is higher than the discharging end of the mixing chamber.
[0008] Preferably, a rotating shaft is coaxially arranged in the mixing chamber, and the rotating shaft rotates through the mixing chamber and is key-connected to a driving device.
[0009] Preferably, the main conveying blade is coaxially fixed to the rotating shaft, and the main conveying blade is clearance-matched with the inner wall of the mixing chamber.
[0010] Preferably, a plurality of outer notches and a plurality of inner notches are respectively provided on the inner and outer sides of the main conveying blade.
[0011] Preferably, the outer conveying blade is fixed in the plurality of outer notches, and the radial range of the outer conveying blade is consistent with the radial range of the outer notches.
[0012] Preferably, the inner conveying blade is fixed in the plurality of inner notches, and the radial range of the inner conveying blade is consistent with the radial range of the inner notches.
[0013] Preferably, the main conveying blade, the outer conveying blade and the inner conveying blade have the same pitch.
[0014] The beneficial effects of the present invention are: 1. The main conveying blades, outer conveying blades and inner conveying blades are used to mix and convey the mixture at the same time. The outer conveying blades and the inner conveying blades convey the mixture in opposite directions from the inner and outer sides of the conveying range of the mixing chamber to promote the mixing of the materials in the entire mixing chamber. 2. The reverse conveying of the outer and inner conveying blades is used to reduce the agglomeration of concentrated sulfuric acid and titanium ore powder when they are mixed in the mixing chamber; 3. The reverse conveying of the outer conveying blades and the inner conveying blades can be used to control the conveying speed of the materials in the entire mixing chamber to a certain extent, so as to prevent the materials from entering the overflow chamber directly due to insufficient mixing.
[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the following is a brief introduction to the drawings required for use in the implementation methods. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 This is a schematic diagram of the overall structure of a continuous premixing device for mineral acid for titanium dioxide production according to an embodiment of the present application; Figure 2 This is a partial structural cross-sectional view of a continuous premixing device for mineral acid for titanium dioxide production according to an embodiment of the present application; Figure 3 is a schematic diagram of the internal structure of a mixing device according to an embodiment of the present application; Figure 4 is an exploded view of a partial structure of a mixing device according to an embodiment of the present application; Figure 5 According to the embodiment of this application Figure 4 A is an enlarged schematic diagram; Figure 6 is a schematic diagram of the internal structure of the overflow chamber according to an embodiment of the present application; Figure 7 According to the embodiment of this application Figure 6 A magnified schematic diagram of B in the middle; Figure 8 is an exploded view of a partial structure of an overflow tank according to an embodiment of the present application; Figure 9 is a schematic diagram of the internal structure of a delivery pipe according to an embodiment of the present application; Figure 10 It is a schematic diagram of the internal structure of the auxiliary cabin according to an embodiment of the present application.
[0018] Icons: 1. Feeding mechanism; 11. Measuring silo; 12. Mineral powder conveyor; 121. Acid inlet; 2. Mixing device; 21. Mixing chamber; 22. Main conveying blade; 221. Rotating shaft; 222. Outer notch; 223. Inner notch; 23. Outer conveying blade; 24. Inner conveying blade; 3. Overflow chamber; 31. Chamber body; 311. Overflow port; 32. Sedimentation chamber; 321. Sewage outlet; 322. Inclined end face; 33. Conveying pipe; 34. Active conveying assembly; 341. Driving motor; 342. Driving shaft; 343. Lifting blade; 344. Conveying cylinder; 345. Support rod; 35. Down-pressure blade; 36. Partition; 37. Paddle; 4. Auxiliary chamber; 41. Variable diameter shell; 42. Guide vane. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.
[0020] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0021] Example 1, as Figures 1-10As shown, a continuous premixing device for mineral acid for titanium dioxide production according to an embodiment of the present application includes a feeding mechanism 1, the output end of the feeding mechanism 1 is connected to a mixing device 2, and the output end of the mixing device 2 is connected to an overflow chamber 3.
[0022] In a specific embodiment of the present application, the mixing device 2 includes a mixing chamber 21, in which a main conveying blade 22 is coaxially arranged, and an outer conveying blade 23 and an inner conveying blade 24 are coaxially arranged on the main conveying blade 22. The main conveying blade 22, the outer conveying blade 23 and the inner conveying blade 24 are all spirally arranged, and the spiral directions of the outer conveying blade 23 and the inner conveying blade 24 are the same. The spiral direction of the main conveying blade 22 is opposite to the spiral directions of the outer conveying blade 23 and the inner conveying blade 24. The outer conveying blade 23 and the inner conveying blade 24 are respectively located on the outer side and the inner side of the diameter direction of the main conveying blade 22, and the main conveying blade 22, the outer conveying blade 23 and the inner conveying blade 24 rotate synchronously.
[0023] Among them, Figure 1 and Figure 2 As shown, the feeding mechanism 1 includes two metering silos 11 and a mineral powder conveyor 12. The two metering silos 11 are arranged at the feeding end of the mineral powder conveyor 12 for alternately feeding materials to the mineral powder conveyor 12. The discharging end of the mineral powder conveyor 12 is connected to the feeding end of the mixing chamber 21.
[0024] Furthermore, an acid inlet 121 is provided at the point where the ore powder conveyor 12 and the mixing chamber 21 are connected.
[0025] It can be understood that in the specific embodiment of the present application, the ground titanium ore powder (after being screened with a 325-mesh sieve) is transported to two metering silos 11, and the titanium ore powder is alternately transported into the ore powder conveyor 12, and then transported to the mixing chamber 21 via the ore powder conveyor 12. During this process, concentrated sulfuric acid with a temperature controlled below 40°C is transported from the acid inlet 121 to the mixing chamber 21, and the titanium ore powder and concentrated sulfuric acid are mixed by the mixing device 2 and transported to the overflow chamber 3.
[0026] It should be noted that the mixing chamber 21 is tilted, and the feeding end of the mixing chamber 21 is higher than the discharging end of the mixing chamber 21. This design facilitates the transportation of the mixture.
[0027] like Figure 3-Figure 5 As shown, a rotating shaft 221 is coaxially arranged in the mixing chamber 21. The rotating shaft 221 rotates through the mixing chamber 21 and is key-connected to a driving device, so that the rotating shaft 221 has kinetic energy for rotation.
[0028] The main conveying blades 22 are coaxially fixed to the rotating shaft 221 , and the main conveying blades 22 and the inner wall of the mixing chamber 21 are clearance-matched.
[0029] It should be noted that a plurality of outer notches 222 and a plurality of inner notches 223 are respectively provided on the inner and outer sides of the main conveying blade 22 .
[0030] In a specific embodiment of the present application, the outer conveying blades 23 are fixed in the plurality of outer notches 222 , and the radial range of the outer conveying blades 23 is consistent with the radial range of the outer notches 222 .
[0031] The inner conveying blades 24 are fixed in the inner notches 223 , and the radial range of the inner conveying blades 24 is consistent with the radial range of the inner notches 223 .
[0032] like Figure 3 As shown, it should be noted that the radial range of the outer notch 222 and the inner notch 223 is not greater than half of the radial range of the main conveying blade 22. Therefore, it can be understood that the amount of material conveyed in the reverse direction in this application is less than the amount of material conveyed in the forward direction, and the reverse conveying is on both sides of the inner and outer sides of the entire conveying range, and the forward conveying is inside the entire conveying range. In this way, the material can be fully mixed during the conveying process.
[0033] It should be further explained that the pitches of the main conveying blades 22 , the outer conveying blades 23 and the inner conveying blades 24 are the same, so as to facilitate the control of the overall conveying volume in the mixing chamber 21 .
[0034] The following describes the use process of a continuous premixing device for mineral acid for titanium dioxide production according to an embodiment of the present application with reference to the accompanying drawings: When in use, the ground titanium ore powder (after being screened with a 325-mesh screen) is transported to two metering silos 11, and the titanium ore powder is alternately transported to the ore powder conveyor 12, and then transported to the mixing chamber 21 through the ore powder conveyor 12. During this process, concentrated sulfuric acid with a temperature controlled below 40°C is transported from the acid inlet 121 to the mixing chamber 21, and the rotating shaft 221 is driven to rotate by an external drive device, so that the coaxially fixed main conveying blades 22, outer conveying blades 23 and inner conveying blades 24 rotate synchronously in the mixing chamber 21. In the process of rotation of the main conveying blades 22, the materials are mixed and discharged. When the material is transported in the direction of the overflow chamber 3 and the outer conveying blades 23 and the inner conveying blades 24 rotate, the local material in the mixing chamber 21 is transported in the reverse direction. This will cause the material originally transported in the forward direction to surge from the axis and the outside to the space between the two within the conveying range. This will further promote the mixing of the material in the mixing chamber 21. At the same time, it will reduce the overall conveying speed of the material in the mixing chamber 21 to a certain extent, and avoid the material being transported to the overflow chamber 3 before it is evenly mixed in the mixing chamber 21. At the same time, the design of forward and reverse conveying further reduces the phenomenon of material agglomeration during the mixing process.
[0035] In the related art, for a continuous premixing device of ore acid used in titanium dioxide production, since titanium ore powder and concentrated sulfuric acid will present a relatively thick slurry during the mixing process, heat will be generated during the mixing process, and its fluidity is relatively poor compared to ordinary fluids. Therefore, after it enters the overflow tank 3, if the liquid level gradually rises and overflows by virtue of the increase in its own quantity, due to its slow flow rate, heat accumulation will occur inside the overflow tank 3, affecting the heat dissipation effect.
[0036] Example 2. According to some embodiments of the present application, as Figure 2 、 Figure 6-Figure 8 shown, the overflow tank 3 includes a tank body 31 vertically arranged and communicating with the discharge end of the mixing tank 21. The bottom end of the tank body 31 is coaxially connected with a precipitation tank 32. A plurality of conveying pipes 33 are circumferentially and evenly arranged on the precipitation tank 32. The other ends of the plurality of conveying pipes 33 are connected to the side wall of the tank body 31. An active conveying component 34 and a pressing blade 35 are coaxially rotatably arranged in the tank body 31. A partition plate 36 is arranged at the top end of the pressing blade 35. The partition plate 36 is located at the bottom side of the connection between the conveying pipe 33 and the side wall of the tank body 31. One end of the active conveying component 34 extending into the precipitation tank 32 is coaxially connected with a paddle 37.
[0037] Among them, an overflow port 311 is arranged on the upper part of the side wall of the tank body 31 to facilitate the overflow of the mixture from here and enter the acidolysis process.
[0038] Specifically, as Figure 6-Figure 8 shown, the cross-section of the precipitation tank 32 is arranged in a U-shape with an open bottom. A sewage discharge port 321 is connected to the bottom end of the precipitation tank 32. An inclined end face 322 is arranged at the inner bottom of the precipitation tank 32. The sewage discharge port 321 is located on the side where the inclined end face 322 slopes downward.
[0039] It should be noted that the inner diameter of the precipitation tank 32 is larger than the inner diameter of the tank body 31 to facilitate the precipitation and removal of insoluble impurities in the mixture.
[0040] Furthermore, the active conveying component 34 includes a driving motor 341 fixedly connected to the top end of the tank body 31. The output end of the driving motor 341 is key-connected with a driving shaft 342. The driving shaft 342 is coaxially arranged in the tank body 31 and the precipitation tank 32. The driving shaft 342 rotates through the partition plate 36. A rising blade 343 is coaxially fixed on the driving shaft 342. The rising blade 343 is located above the partition plate 36. A conveying cylinder 344 is coaxially sleeved outside the rising blade 343. A plurality of support rods 345 are circumferentially and evenly fixed on the outer wall of the conveying cylinder 344. The plurality of support rods 345 are fixedly connected to the inner wall of the tank body 31. The top end of the conveying cylinder 344 is located below the overflow port 311.
[0041] It should be noted that the partition 36 is located above the connection between the chamber 31 and the mixing chamber 21, so that the chamber 31 is divided into two halves, the lower half is used for sedimentation and the upper half is used for overflow, so as to make the mixture undergoing the acid hydrolysis reaction purer.
[0042] Furthermore, the downward pressure blade 35 is coaxially fixed to the drive shaft 342, and the spiral direction of the downward pressure blade 35 is opposite to the spiral direction of the upward lifting blade 343. It can be understood that the reverse design of the two can make the mixture entering the lower half of the cabin body 31 flow downward into the sedimentation chamber 32, and the mixture entering the upper half of the cabin body 31 can flow upward at the axis center, thereby avoiding heat accumulation of the mixture in the entire overflow chamber 3 due to the slow flow rate.
[0043] Furthermore, the paddle 37 is coaxially fixed to the drive shaft 342 and extends to one end of the sedimentation chamber 32 . It can be understood that the rotating paddle 37 further helps the mixture flow from the chamber body 31 into the sedimentation chamber 32 .
[0044] Thus, it can be understood that, during specific use, when the mixed material is transported from the mixing chamber 21 to the chamber body 31, the mixed material can and can only enter the lower part of the chamber body 31, and is blocked by the partition 36, and cannot directly enter the upper part of the chamber body 31. The material entering the lower part of the chamber body 31 is driven by the driving motor 341 to drive the driving shaft 342 to rotate and then transported downwardly following the rotating downward pressure blade 35. The material will enter the sedimentation chamber 32 below at a certain speed. In this process, the rotation of the driving shaft 342 drives the blade 37 to rotate. Therefore, when the material enters the sedimentation chamber 32, it will also have a tendency to be thrown outward due to the rotation of the blade 37, so that the material has centrifugal force. In this way, the impurities in the material entering the sedimentation chamber 32 will be thrown to the sedimentation chamber 32. The material flows in the direction of the inner wall of the sedimentation chamber 32, and finally converges at the sewage outlet 321 due to the design of the inclined end face 322. After the sedimentation chamber 32 is filled with materials, they overflow upward from multiple conveying pipes 33 and enter the upper part of the chamber 31, that is, above the partition 36, through the conveying pipe 33. The materials here are conveyed by the upward blades 343 and the conveying cylinder 344, and will circulate and rise from the inside of the conveying cylinder 344 and fall from the top of the conveying cylinder 344 to the outside of the conveying cylinder 344. As the material in the chamber 31 accumulates, the liquid level will gradually rise until it overflows from the overflow port 311. The design of the upper part of the chamber 31 makes the material circulate and rise along the axis here, which can avoid the phenomenon of heat accumulation of the material due to the slow flow rate and help the volatilization of heat.
[0045] In the related art, for a continuous premixing device for ore acid used in titanium dioxide production, during the process of conveying materials from the precipitation chamber 32 to the inside of the chamber 31, the fluid passage is composed of multiple conveying pipes 33, and the diameter of the conveying pipe 33 is significantly smaller than that of the precipitation chamber 32. Thus, it can be understood that the flow rate of the materials at the conveying pipe 33 will be significantly greater than that in the precipitation chamber 32. The increase in the flow rate will cause some insoluble substances that have not had time to precipitate onto the inclined end face 322 of the precipitation chamber 32 to directly enter the conveying pipe 33 along with the mixture and be conveyed to the upper part of the chamber 31, resulting in a decrease in the purity of the mixture at the overflow, affecting the effect of subsequent acid hydrolysis reactions.
[0046] Example 3. According to some embodiments of the present application, as Figure 9 and Figure 10 shown, one end of the conveying pipe 33 connected to the precipitation chamber 32 is coaxially provided with an auxiliary chamber 4, and the inner diameter of the auxiliary chamber 4 is larger than the inner diameter of the conveying pipe 33.
[0047] Furthermore, the auxiliary chamber 4 includes a reduced-diameter housing 41. The two ends of the reduced-diameter housing 41 are respectively connected to the conveying pipe 33 and the precipitation chamber 32. A plurality of guide vanes 42 are circumferentially and uniformly arranged inside the reduced-diameter housing 41. The plurality of guide vanes 42 are distributed along the radial direction of the reduced-diameter housing 41, and the inner diameter of the guide vanes 42 is not less than the inner diameter of the conveying pipe 33.
[0048] It can be understood that the plurality of guide vanes 42 divide the inside of the reduced-diameter housing 41 into a plurality of lanes with a large outer and a small inner diameter.
[0049] Thus, it can be understood that when the mixed materials enter the reduced-diameter housing 41, due to the sudden increase in the channel diameter, the flow rate of the fluid will significantly decrease here, and the fluid will flow along the lanes divided by the plurality of guide vanes 42 towards the inner wall direction of the reduced-diameter housing 41, and then flow along the conveying pipe 33 towards the upper part of the chamber 31. During this process, due to the decrease in the fluid velocity inside the reduced-diameter housing 41, the impurities carried in it will precipitate in the lanes, further purifying the mixed materials. The precipitated impurities can be discharged when the subsequent equipment is shut down. Of course, the reduced-diameter housing 41 can also be designed in a U-shaped (cross-section) with an opening downward according to the shape of the precipitation chamber 32, and a valve for sewage discharge can be provided at the bottom to facilitate the discharge of the precipitated substances.
[0050] It should be noted that the specific model specifications of the metering bin 11, the ore powder conveyor 12, the paddle 37, and the drive motor 341 need to be selected according to the actual specifications of the device, etc. The specific selection calculation method adopts the existing technology in the field, so it will not be elaborated in detail.
[0051] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.
Claims
1. A continuous premixing device for mineral acid for titanium dioxide production, comprising a feeding mechanism (1), wherein the output end of the feeding mechanism (1) is connected to a mixing device (2), and the output end of the mixing device (2) is connected to an overflow chamber (3), characterized in that: The mixing device (2) comprises a mixing chamber (21), wherein a main conveying blade (22) is coaxially arranged in the mixing chamber (21), and an outer conveying blade (23) and an inner conveying blade (24) are coaxially arranged on the main conveying blade (22). The main conveying blade (22), the outer conveying blade (23) and the inner conveying blade (24) are all arranged in a spiral shape. The spiral directions of the outer conveying blade (23) and the inner conveying blade (24) are the same. The spiral direction of the main conveying blade (22) is opposite to the spiral directions of the outer conveying blade (23) and the inner conveying blade (24). The outer conveying blade (23) and the inner conveying blade (24) are respectively located on the outer side and the inner side of the diameter direction of the main conveying blade (22). The main conveying blade (22), the outer conveying blade (23) and the inner conveying blade (24) rotate synchronously.
2. The continuous premixing device for mineral acid for titanium dioxide production according to claim 1, characterized in that: The feeding mechanism (1) comprises two metering silos (11) and a mineral powder conveyor (12). The two metering silos (11) are arranged at the feeding end of the mineral powder conveyor (12) for alternately feeding materials to the mineral powder conveyor (12). The discharging end of the mineral powder conveyor (12) is connected to the feeding end of the mixing chamber (21).
3. The continuous premixing device for mineral acid for titanium dioxide production according to claim 2, characterized in that: An acid inlet (121) is provided at the point where the mineral powder conveyor (12) and the mixing chamber (21) are connected.
4. The continuous premixing device for mineral acid for titanium dioxide production according to claim 1, characterized in that: The mixing chamber (21) is arranged at an angle, and the feeding end of the mixing chamber (21) is higher than the discharging end of the mixing chamber (21).
5. The continuous premixing device for mineral acid for titanium dioxide production according to claim 1, characterized in that: A rotating shaft (221) is coaxially arranged in the mixing chamber (21); the rotating shaft (221) rotates through the mixing chamber (21) and is key-connected to a driving device.
6. The continuous premixing device for mineral acid for titanium dioxide production according to claim 5, characterized in that: The main conveying blade (22) is coaxially fixed to the rotating shaft (221), and the main conveying blade (22) and the inner wall of the mixing chamber (21) are clearance-matched.
7. The continuous premixing device for mineral acid for titanium dioxide production according to claim 1, characterized in that: The main conveying blade (22) is provided with a plurality of outer notches (222) and a plurality of inner notches (223) on the inner and outer sides, respectively.
8. The continuous premixing device for mineral acid for titanium dioxide production according to claim 7, characterized in that: The outer conveying blade (23) is fixedly connected to the plurality of outer notches (222), and the radial range of the outer conveying blade (23) is consistent with the radial range of the outer notches (222).
9. The continuous premixing device for mineral acid for titanium dioxide production according to claim 7, characterized in that: The inner conveying blade (24) is fixedly connected to the plurality of inner notches (223), and the radial range of the inner conveying blade (24) is consistent with the radial range of the inner notches (223).
10. The continuous premixing device for mineral acid for titanium dioxide production according to claim 1, characterized in that: The main conveying blade (22), the outer conveying blade (23), and the inner conveying blade (24) have the same pitch.