Preparation device of titanium dioxide hydrolysis seed crystal

Abstract

The utility model provides a titanium dioxide hydrolysis seed crystal preparation device which comprises an alkali liquor preparation tank, a titanium liquor preparation tank, a hydrolysis seed crystal preparation tank, a main feeding pipe and a branch feeding pipe, and the main feeding pipe and the branch feeding pipe are connected through welding or flanges. Wherein the main feeding pipe comprises a horizontal main feeding pipe and a vertical main feeding pipe, one end of the horizontal main feeding pipe is communicated with a discharging pipe at the bottom of the alkali liquor preparation tank, and the other end of the horizontal main feeding pipe is communicated with a discharging pipe at the bottom of the titanium liquid preparation tank; the branch feed pipes comprise an annular branch feed pipe and a plurality of vertical branch feed pipes, the annular branch feed pipe is positioned at the top of the hydrolysis seed crystal preparation tank, and the vertical branch feed pipes are vertical to the annular branch feed pipe and extend to the bottom of the hydrolysis seed crystal preparation tank.

Description

Technical Field

[0001] The utility model relates to the technical field of titanium dioxide production, in particular to a device for preparing titanium dioxide hydrolysis crystal seeds. Background Art

[0002] Industrially, titanium dioxide (TiO2) is the preferred white pigment, widely used in coatings, plastics, rubber, papermaking, and inks. Currently, the sulfuric acid process for producing titanium dioxide primarily involves three steps: acid hydrolysis, hydrolysis, and surface post-treatment. The hydrolysis step is particularly critical, directly impacting the quality of crude titanium dioxide. Hydrolysis seeds are a crucial component of the titanium dioxide production process, particularly during the hydrolysis stage. They are used to induce nucleation, accelerate the hydrolysis rate, and ensure hydrolysis stability and product quality.

[0003] In the current preparation process of hydrolysis seed crystals, alkali solution is usually added to black titanium liquid quickly within a certain period of time. The addition time of alkali solution and its stirring have a great impact on the stability of hydrolysis seed crystals. Alkali solution and black titanium liquid are often heated by high-temperature steam in industry, and the addition temperature is very easy to be higher than the preset temperature. However, if the addition speed is increased, it is easy to cause the alkali solution to accumulate above the black titanium liquid, and the local concentration is too high, affecting the stability of the seed crystals. Therefore, the current production difficulties of hydrolysis seed crystals are mainly reflected in the uneven stirring of alkali solution and titanium liquid, as well as the problem of local feed accumulation, which will lead to low stability of hydrolysis seed crystals and poor effect, thereby affecting the hydrolysis process of the entire titanium dioxide.

[0004] CN210434488U discloses a hydrolysis seed preparation device, comprising a device housing and an electric heater disposed within the device housing. A liquid caustic soda preparation tank and a seed crystal preparation tank are disposed within the device housing. The liquid caustic soda preparation tank and the seed crystal preparation tank are connected by a connecting pipe, one end of the connecting pipe being connected to the bottom of the liquid caustic soda preparation tank and the other end being connected to the lower middle portion of the seed crystal preparation tank. A control valve is also disposed on the connecting pipe. Both the liquid caustic soda preparation tank and the seed crystal preparation tank are provided with temperature sensors and feeding ports. A linear agitator is also disposed above the seed crystal preparation tank, a discharge pipe is disposed at the lower end, and a discharge valve is disposed on the radiotherapy tube. However, this device design still fails to solve the problem of poor stability of hydrolysis seed crystals caused by local feed accumulation.

[0005] CN211004603U discloses a device for uniformly distributing hydrolysis seed crystals, including a circular distributor device and a hydrolysis tank device; the circular distributor device includes a circular distributor, a peristaltic pump and a seed preparation tank, and the hydrolysis tank device includes a hydrolysis tank and an agitator; the agitator is connected to a motor and driven by it, and the seed preparation tank, the peristaltic pump and the circular distributor are connected in sequence from top to bottom through a titanium tube; the agitator is arranged in the hydrolysis tank and is located above the horizontally arranged circular distributor, and the seed preparation tank and the peristaltic pump are arranged on one side of the agitator. However, this device structure still produces a situation where the material addition temperature is higher than the preset temperature for a short time, and the effect of solving the uniform mixing of the two raw materials is limited.

[0006] Therefore, given the design limitations of existing titanium dioxide hydrolysis seed preparation equipment, how to avoid local feed accumulation of alkali solution and black titanium liquid, thereby improving the adverse effects of poor stability of hydrolysis seeds on titanium dioxide product quality, is a problem that needs to be solved urgently. Summary of the Invention

[0007] To address the above issues, the present invention provides a device for preparing titanium dioxide hydrolysis seed crystals. By providing a main feed pipe and a branch feed pipe, the device allows for more uniform discharge of alkali solution and titanium solution in a steady-flow mixing manner within the pipes, thereby improving the product stability of the hydrolysis seed crystals.

[0008] The solution of this utility model is as follows:

[0009] A device for preparing titanium dioxide hydrolysis seed crystals, comprising an alkali solution preparation tank, a titanium solution preparation tank, a hydrolysis seed crystal preparation tank, a main feed pipe and a branch feed pipe, wherein the main feed pipe and the branch feed pipe are connected by welding or flanges;

[0010] Wherein, the main feed pipe includes a horizontal main feed pipe and a vertical main feed pipe, one end of the horizontal main feed pipe is connected to the discharge pipe at the bottom of the alkali solution preparation tank, and the other end of the horizontal main feed pipe is connected to the discharge pipe at the bottom of the titanium liquid preparation tank; the main pipe of the horizontal main feed pipe is connected to one end of the vertical main feed pipe, and the other end of the vertical main feed pipe passes through the mixed feed port at the top of the hydrolysis seed crystal preparation tank and is connected to the branch feed pipe;

[0011] The feed pipe includes an annular feed pipe and a plurality of vertical feed pipes, wherein the annular feed pipe is located at the top of the hydrolysis seed preparation tank, and the vertical feed pipes are perpendicular to the annular feed pipe and extend to the bottom of the hydrolysis seed preparation tank;

[0012] After the alkali solution and titanium solution are preliminarily mixed in the horizontal main feed pipe, they are merged into the annular branch feed pipe through the vertical main feed pipe, and then flow evenly and dispersedly to each of the vertical branch feed pipes, thereby entering the hydrolysis seed preparation tank in a steady flow mixing manner.

[0013] Furthermore, the main feed pipe is an integrally formed structure or a detachable multi-section structure, and each section is connected by a flange or thread.

[0014] Furthermore, the main pipe of the horizontal main feed pipe and one end of the vertical main feed pipe are connected by welding or flange.

[0015] Furthermore, any point on the main pipe of the horizontal main feed pipe can be connected to one end of the vertical main feed pipe; preferably, the middle point on the main pipe of the horizontal main feed pipe is connected to one end of the vertical main feed pipe.

[0016] Furthermore, one end of the horizontal main feed pipe is connected to the discharge pipe at the bottom of the alkali solution preparation tank via welding or flange connection; the other end of the horizontal main feed pipe is also connected to the discharge pipe at the bottom of the titanium liquid preparation tank via welding or flange connection. This connection ensures stable and leak-free delivery of alkali solution or titanium liquid from the alkali solution or titanium liquid preparation tank to the horizontal main feed pipe, where it can be used in the subsequent hydrolysis seed crystal preparation process. The flange connection provides ease of disassembly and maintenance, while the welding connection provides enhanced sealing and structural strength.

[0017] Furthermore, one or more first control valves are arranged between the horizontal main feed pipe and the discharge pipe at the bottom of the alkali solution preparation tank, and one or more second control valves are arranged between the horizontal main feed pipe and the discharge pipe at the bottom of the titanium liquid preparation tank, so that the alkali solution and titanium liquid can enter the pipeline according to the set ratio and flow rate.

[0018] Furthermore, one or more flow meters are installed on the main pipe of the horizontal main feed pipe to accurately measure the fluid flow through the main pipe. This flow is precisely controlled by the control valve. If the measured flow deviates from the set value, the control system can automatically adjust the valve opening to restore the flow to the set value, thereby maintaining the stability of the production process.

[0019] Furthermore, the other end of the vertical main feed pipe is connected to the annular branch feed pipe by welding or flange.

[0020] Furthermore, the vertical main feed pipe may be provided with an additional control valve as required so as to adjust the total flow rate after the alkali solution and the titanium solution are mixed.

[0021] Furthermore, one or more fixing parts are provided between the branch feed pipe and the inner wall of the hydrolysis seed preparation tank to ensure that the branch feed pipe is firmly fixed on the tank body of the hydrolysis seed preparation tank to prevent shaking or falling off under the impact of the material fluid.

[0022] Furthermore, the fixing parts adopt various types such as brackets, clamps, flanges, etc., and the number is determined according to the number and arrangement of the vertical branch feed pipes. Usually, each vertical branch feed pipe should be equipped with at least one fixing part.

[0023] Furthermore, the fixing member is connected to the tank body and the vertical feed pipe by welding or bolts.

[0024] Furthermore, the sub-feed pipe is an integrally formed structure or a detachable multi-section structure, and each section is connected by a flange or thread.

[0025] Furthermore, the annular branch feed pipe is provided with a plurality of connection ports symmetrically distributed along the circumference, so that each vertical branch feed pipe is sealed and fixed to the corresponding connection port by welding and flange, or the annular branch feed pipe and the vertical branch feed pipe are an integrated molding structure to ensure that the mixed liquid will not leak during the transportation process.

[0026] Furthermore, the annular branch feed pipe is a pipe surrounding the top edge of the hydrolysis seed preparation tank, and its function is to further disperse the mixed liquid (alkali solution and titanium liquid) flowing in from the main feed pipe so that it can enter the hydrolysis seed preparation tank more evenly.

[0027] Furthermore, the number of the vertical feed pipes is 2, 4, 6, 8 or more, preferably 6.

[0028] Furthermore, the vertical branch feed pipes may be provided with control valves, which are connected to a control system for precisely controlling the flow of each vertical branch feed pipe to further ensure uniform distribution of the mixed liquid in the hydrolysis seed preparation tank.

[0029] Furthermore, the main feed pipe and the branch feed pipe are made of corrosion-resistant alloy. In addition to the commonly used stainless steel material, Hastelloy, titanium alloy, etc. can also be used as the material of the feed pipe to cope with more severe working environments.

[0030] Furthermore, the inner walls of the main feed pipe and the branch feed pipe are coated or lined with a layer of corrosion-resistant material, such as polytetrafluoroethylene, ceramic, etc., to improve the corrosion resistance and wear resistance of the feed pipe.

[0031] Furthermore, the alkali solution preparation tank, the titanium solution preparation tank, and the hydrolysis seed crystal preparation tank are made of corrosion-resistant materials, such as stainless steel and titanium alloy, which have better corrosion resistance and wear resistance in high temperature and acidic and alkaline environments.

[0032] Furthermore, the inner walls of the alkali solution preparation tank, the titanium liquid preparation tank and the hydrolysis crystal seed preparation tank are provided with a ceramic lining coating or a polymer material lining coating to improve the corrosion resistance and service life of the tank body.

[0033] Furthermore, the tank bodies of the alkali solution preparation tank, the titanium liquid preparation tank and the hydrolysis crystal seed preparation tank are structures designed based on fluid mechanics optimization, such as a structure with a cylindrical upper part and a conical lower part, a full cylindrical structure or an ellipsoidal structure, so as to improve the mixing effect and reaction efficiency of the materials.

[0034] Furthermore, the tops of the alkali solution preparation tank, the titanium solution preparation tank and the hydrolysis seed crystal preparation tank are respectively provided with a titanium solution feed port, an alkali solution feed port and a mixed feed port.

[0035] Furthermore, stirring paddles are installed in the center of the alkali solution preparation tank, the titanium solution preparation tank, and the hydrolysis seed crystal preparation tank. These stirring paddles are in the shape of stainless steel blades and are driven by an external motor located above the tank to control the stirring rate and time, ensuring uniform mixing of the materials within the tank. In addition to paddle-shaped stirring paddles, other shapes of stirring paddles can also be used, such as multi-layered blades, propellers, or turbines, to meet different mixing requirements.

[0036] Furthermore, the inner walls of the alkali solution preparation tank, the titanium liquid preparation tank and the hydrolysis seed crystal preparation tank are respectively surrounded by steam heating coils, which are heated to a set temperature by steam to maintain the required temperature of the tank body.

[0037] Furthermore, the inner walls of the alkali solution preparation tank, the titanium liquid preparation tank and the hydrolysis crystal seed preparation tank are respectively provided with a temperature control system, including a temperature sensor and a controller; the temperature sensor monitors the reaction temperature and heating temperature in real time through precise temperature control; the controller automatically adjusts the opening and closing of the steam valve according to the signal feedback from the temperature sensor to maintain the required temperature of the tank body. When the set temperature is reached, the steam valve is automatically closed, heating is stopped, and the discharge operation is performed.

[0038] The working process of the hydrolysis seed crystal preparation device of the utility model is as follows:

[0039] (1) Turn on the stirring paddles and steam heating of the alkali solution preparation tank and the titanium solution preparation tank to heat the alkali solution and titanium solution to the set temperature respectively;

[0040] (2) When the temperature sensor detects that the temperature of the alkali solution and the titanium solution reaches the set temperature, the steam heating is turned off and the discharge valves of the alkali solution preparation tank and the titanium solution preparation tank are opened at the same time, so that the alkali solution and the titanium solution are respectively mixed through the discharge pipe at the bottom of the tank through the horizontal main feed pipe and then enter the vertical main feed pipe;

[0041] (3) The mixture of alkali solution and titanium solution continues to merge into the annular branch feed pipe through the vertical main feed pipe, and then dispersedly flows to each vertical branch feed pipe and evenly enters the hydrolysis seed preparation tank;

[0042] (4) In the hydrolysis seed crystal preparation tank, start the stirring paddle and steam heating, and continue to heat the steam heating coil to the temperature required for the hydrolysis seed crystal reaction;

[0043] (5) When the reaction temperature of the hydrolysis seed crystal preparation tank reaches the required temperature and stabilizes, stop steam heating, carry out the discharge operation, and send the hydrolysis seed crystals to the next process.

[0044] The technical solution provided by the utility model may have the following beneficial effects:

[0045] (1) The preparation device of the present invention adopts an integrated design of an alkali solution preparation tank, a titanium solution preparation tank, a hydrolysis seed crystal preparation tank, a main feed pipe, and a branch feed pipe. By pre-mixing the alkali solution and titanium solution in the main feed pipe and evenly dispersing them through multiple vertical branch feed pipes before entering the hydrolysis seed crystal preparation tank, the problems of uneven mixing of the alkali solution and titanium solution and localized feed accumulation in the prior art are effectively solved. This uniform and stable mixed feeding method makes the nucleation process of the hydrolysis seed crystal more consistent and improves the stability of the seed crystal.

[0046] (2) The preparation device also takes into account the scalability of the feeding method, such as the adjustability of the number of vertical feed pipes (which can be several evenly distributed), so that the device can be flexibly adjusted and optimized according to different production conditions.

[0047] (3) The temperature control system, combined with temperature sensors and controllers, enables precise control of the temperature inside the hydrolysis seed preparation tank. This avoids the problem of unstable seed quality caused by temperature fluctuations and ensures the smooth progress of the hydrolysis process.

[0048] (4) The hydrolysis seed preparation tank is made of stainless steel, which has excellent corrosion resistance. At the same time, the tank body is rationally designed, with internal installation positions for stirring paddles and the arrangement of heating coils, which facilitates efficient stirring and uniform heating. In addition, the annular feed pipe and the vertical feed pipe are stably connected to the top of the tank body through fixings, ensuring the stability and reliability of the feeding process.

[0049] (5) The reaction device can be used to start the stirring and heating of the alkali solution preparation tank and the titanium liquid preparation tank in advance, and accurately control the flow rate and temperature, etc., making the equipment operation simpler and faster, and reducing the operation difficulty and labor intensity.

[0050] (6) The hydrolysis seed preparation device of the utility model has performed well in industrial production. Its uniform mixing and stable control characteristics make the preparation process of the hydrolysis seed more efficient and stable, thereby improving the production efficiency of the entire titanium dioxide production line. Due to the improved stability and preparation effect of the hydrolysis seed, the quality of the final crude titanium dioxide product is significantly improved. This not only enhances the market competitiveness of the product, but also provides users with a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a structural schematic diagram of a device for preparing hydrolysis seed crystals of the utility model.

[0052] The reference numerals are as follows:

[0053] 1: Alkali solution preparation tank 2: Titanium liquid preparation tank 3: Hydrolysis seed preparation tank 4: Horizontal main feed pipe 5: Vertical main feed pipe 6: Discharge pipe at the bottom of the alkali solution preparation tank 7: Discharge pipe at the bottom of the titanium liquid preparation tank 8: Annular branch feed pipe 9: Vertical branch feed pipe 10: First control valve 11: Second control valve 12: Flow meter 13: Fixing part 14: Alkali solution feed port 15: Titanium liquid feed port 16: First stirring paddle 17: Second stirring paddle 18: Third stirring paddle 19: First external motor drive 20: Second external motor drive 21: Third external motor drive 22: Temperature control system. DETAILED DESCRIPTION

[0054] The following description and accompanying drawings sufficiently illustrate specific embodiments of the present invention to enable those skilled in the art to practice them. The examples represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for portions and features of other embodiments. The scope of the embodiments of the present invention includes the entire scope of the claims, as well as all available equivalents thereof. Herein, various embodiments may be referred to individually or collectively by the term "utility model," which is merely for convenience and does not automatically limit the scope of application to any single utility model or utility model concept if more than one utility model is disclosed. Herein, relational terms such as first and second, etc., are used solely to distinguish one entity or operation from another, and do not require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, or apparatus comprising a set of elements includes not only those elements, but also other elements not explicitly listed. The various embodiments herein are described in a progressive manner, with each embodiment focusing on the differences from the other embodiments. Reference can be made to the common and similar parts between the various embodiments. For structures, products, etc. disclosed in the embodiments, the description is relatively simple because they correspond to the parts disclosed in the embodiments. For relevant parts, refer to the method description.

[0055] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0056] Example

[0057] A device for preparing titanium dioxide hydrolysis seed crystals, comprising an alkali solution preparation tank 1, a titanium solution preparation tank 2, a hydrolysis seed crystal preparation tank 3, a main feed pipe and a branch feed pipe, wherein the main feed pipe and the branch feed pipe are connected by welding or flanges;

[0058] Among them, the main feed pipe includes a horizontal main feed pipe 4 and a vertical main feed pipe 5, one end of the horizontal main feed pipe 4 is connected to the discharge pipe 6 at the bottom of the alkali solution preparation tank 1, and the other end of the horizontal main feed pipe 4 is connected to the discharge pipe 7 at the bottom of the titanium liquid preparation tank 2; the main pipe of the horizontal main feed pipe 4 is connected to one end of the vertical main feed pipe 5, and the other end of the vertical main feed pipe 5 passes through the mixed feed port at the top of the hydrolysis seed preparation tank 3 and is connected to the sub-feed pipe;

[0059] The feed pipes include an annular feed pipe 8 and several vertical feed pipes 9. The annular feed pipe 9 is located at the top of the hydrolysis seed preparation tank 3. The vertical feed pipes 9 are perpendicular to the annular feed pipe 8 and extend to the bottom of the hydrolysis seed preparation tank 3.

[0060] After the alkali solution and titanium solution are preliminarily mixed in the horizontal main feed pipe 4, they are merged into the annular branch feed pipe 8 through the vertical main feed pipe 5, and then flow evenly and dispersedly to each vertical branch feed pipe 9, thereby entering the hydrolysis seed preparation tank 3 in a steady flow mixing manner.

[0061] Furthermore, the main feed pipe is an integrally formed structure or a detachable multi-section structure, and each section is connected by a flange or thread.

[0062] Furthermore, the main pipe of the horizontal main feed pipe 4 and one end of the vertical main feed pipe 5 are connected by welding or flange.

[0063] Furthermore, any point on the main body of the horizontal main feed pipe 4 can be connected to one end of the vertical main feed pipe 5; preferably, the middle point on the main body of the horizontal main feed pipe 4 is connected to one end of the vertical main feed pipe 5.

[0064] Furthermore, one end of the horizontal main feed pipe 4 is connected to the discharge pipe 6 at the bottom of the alkali solution preparation tank 1 via welding or flange connection; the other end of the horizontal main feed pipe 4 is also connected to the discharge pipe 7 at the bottom of the titanium liquid preparation tank 2 via welding or flange connection. This connection ensures stable and leak-free delivery of alkali or titanium liquid from the alkali solution or titanium liquid preparation tank to the horizontal main feed pipe 4, where it can be used in the subsequent hydrolysis seed crystal preparation process. The flange connection provides ease of disassembly and maintenance, while the welding connection provides enhanced sealing and structural strength.

[0065] Furthermore, one or more first control valves 10 are set between the horizontal main feed pipe 4 and the discharge pipe 6 at the bottom of the alkali solution preparation tank 1, and one or more second control valves 11 are set between the horizontal main feed pipe 4 and the discharge pipe 7 at the bottom of the titanium liquid preparation tank 1, so that the alkali solution and titanium liquid can enter the pipeline according to the set proportion and flow rate.

[0066] Furthermore, one or more flow meters 12 are installed on the main pipeline of the horizontal main feed pipe 4 to accurately measure the fluid flow rate through the main pipeline. By interlocking with the control valve, the flow rate can be precisely controlled. If the measured flow rate deviates from the set value, the control system can automatically adjust the valve opening to restore the flow rate to the set value, thereby maintaining the stability of the production process.

[0067] Furthermore, the other end of the vertical main feed pipe 5 is connected to the annular branch feed pipe 8 by welding or flange.

[0068] Furthermore, the vertical main feed pipe 5 may be provided with an additional control valve as required so as to adjust the total flow rate after the alkali solution and the titanium solution are mixed.

[0069] Furthermore, one or more fixing members 13 are provided between the feed pipe and the inner wall of the hydrolysis seed preparation tank 3 to ensure that the feed pipe is firmly fixed on the tank body of the hydrolysis seed preparation tank 3 to prevent shaking or falling off under the impact of the material fluid.

[0070] Furthermore, the fixing parts 13 are of various types such as brackets, clamps, flanges, etc., and the number is determined according to the number and arrangement of the vertical branch feed pipes 9. Usually, each vertical branch feed pipe 9 should be equipped with at least one fixing part 13.

[0071] Furthermore, the fixing member 13 is connected to the tank body and the vertical feed pipe 9 by welding or bolts.

[0072] Furthermore, the feed pipe is an integrally formed structure or a detachable multi-section structure, and each section is connected by a flange or thread.

[0073] Furthermore, the annular branch feed pipe 8 is provided with a plurality of connection ports symmetrically distributed along the circumference, so that each vertical branch feed pipe 9 is sealed and fixed to the corresponding connection port by welding and flange, or the annular branch feed pipe 8 and the vertical branch feed pipe 9 are an integrated molding structure to ensure that the mixed liquid will not leak during the transportation process.

[0074] Furthermore, the annular branch feed pipe 8 is a pipe surrounding the top edge of the hydrolysis seed preparation tank 3, and its function is to further disperse the mixed liquid (alkali solution and titanium solution) introduced from the main feed pipe so that it can enter the hydrolysis seed preparation tank 3 more evenly.

[0075] Furthermore, the number of vertical feed pipes 9 is 2, 4, 6, 8 or more, preferably 6.

[0076] Furthermore, a control valve may be provided on the vertical branch feed pipe 9 , which is connected to the control system for precisely controlling the flow of each vertical branch feed pipe 9 to further ensure uniform distribution of the mixed liquid in the hydrolysis seed preparation tank 3 .

[0077] Furthermore, the main feed pipe and the branch feed pipe are made of corrosion-resistant alloy. In addition to the commonly used stainless steel material, Hastelloy, titanium alloy, etc. can also be used as the material of the feed pipe to cope with more severe working environments.

[0078] Furthermore, the inner walls of the main feed pipe and the branch feed pipe are coated or lined with a layer of corrosion-resistant material, such as polytetrafluoroethylene, ceramic, etc., to improve the corrosion resistance and wear resistance of the feed pipe.

[0079] Furthermore, the tank bodies of the alkali solution preparation tank 1, the titanium solution preparation tank 2, and the hydrolysis seed crystal preparation tank 3 are made of corrosion-resistant materials. Corrosion-resistant materials include stainless steel, titanium alloy, etc. These materials have better corrosion resistance and wear resistance to high temperature and acid-base environments.

[0080] Furthermore, a ceramic lining coating or a polymer material lining coating is provided on the inner wall of the alkali solution preparation tank 1, the titanium liquid preparation tank 2 and the hydrolysis seed crystal preparation tank 3 to improve the corrosion resistance and service life of the tank body.

[0081] Furthermore, the tank bodies of the alkali solution preparation tank 1, the titanium liquid preparation tank 2 and the hydrolysis seed preparation tank 3 are structures optimized according to fluid mechanics, such as a structure with a cylindrical upper part and a conical lower part, a full cylindrical structure or an ellipsoidal structure, so as to improve the mixing effect and reaction efficiency of the materials.

[0082] Furthermore, an alkali solution feeding port 14, a titanium solution feeding port 15 and a mixed feeding port are respectively provided on the top of the tank bodies of the alkali solution preparation tank 1, the titanium solution preparation tank 2 and the hydrolysis seed crystal preparation tank 3.

[0083] Furthermore, stirring paddles (first stirring paddle 16, second stirring paddle 17, and third stirring paddle 18) are each installed at the center of the alkali solution preparation tank 1, titanium solution preparation tank 2, and hydrolysis seed crystal preparation tank 3. These stirring paddles are stainless steel blades and driven by external motors located above the tanks (first external motor drive 19, second external motor drive 20, and third external motor drive 21) to control the stirring rate and time, ensuring uniform mixing of the materials within the tanks. In addition to paddle-shaped stirring paddles, other shapes can also be used, such as multi-layered blades, propellers, or turbines, to accommodate different mixing requirements.

[0084] Furthermore, the inner walls of the alkali solution preparation tank 1, the titanium liquid preparation tank 2 and the hydrolysis seed crystal preparation tank 3 are respectively surrounded by steam heating coils, which are heated to a set temperature by steam to maintain the required temperature of the tank body.

[0085] Furthermore, the tank bodies of the alkali solution preparation tank 1, the titanium liquid preparation tank 2 and the hydrolysis seed preparation tank 3 are respectively provided with a temperature control system 22, including a temperature sensor and a controller; the temperature sensor monitors the reaction temperature and heating temperature in real time through precise temperature control; the controller automatically adjusts the opening and closing of the steam valve according to the signal feedback from the temperature sensor to maintain the required temperature of the tank body. When the set temperature is reached, the steam valve is automatically closed, the heating is stopped, and the discharge operation is performed.

[0086] The working process of the hydrolysis seed crystal preparation device of the utility model is as follows:

[0087] (1) Turn on the stirring paddles and steam heating of the alkali solution preparation tank and the titanium solution preparation tank to heat the alkali solution and titanium solution to the set temperature of 85°C respectively;

[0088] (2) When the temperature sensor detects that the temperature of the alkali solution and the titanium solution reaches the set temperature, the steam heating is turned off and the discharge valves of the alkali solution preparation tank and the titanium solution preparation tank are opened at the same time, so that the alkali solution and the titanium solution are respectively mixed through the discharge pipe at the bottom of the tank through the horizontal main feed pipe and then enter the vertical main feed pipe;

[0089] (3) The mixture of alkali solution and titanium solution continues to merge into the annular branch feed pipe through the vertical main feed pipe, and then dispersedly flows to each vertical branch feed pipe and evenly enters the hydrolysis seed preparation tank;

[0090] (4) In the hydrolysis seed crystal preparation tank, start the stirring paddle and steam heating, and continue to heat the steam heating coil to the temperature required for the hydrolysis seed crystal reaction;

[0091] (5) When the reaction temperature of the hydrolysis seed crystal preparation tank reaches the required temperature and stabilizes, stop steam heating, carry out the discharge operation, and send the hydrolysis seed crystals to the next process.

[0092] The above description is merely a preferred embodiment of the present invention and does not constitute any other limitation to the present invention. Any modification or equivalent variation based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A device for preparing titanium dioxide hydrolysis seed crystals, characterized in that: The preparation device comprises an alkali solution preparation tank (1), a titanium solution preparation tank (2), a hydrolysis seed crystal preparation tank (3), a main feed pipe and a branch feed pipe, wherein the main feed pipe and the branch feed pipe are connected by welding or flanges; Wherein, the main feed pipe comprises a horizontal main feed pipe (4) and a vertical main feed pipe (5), one end of the horizontal main feed pipe (4) is connected to the discharge pipe (6) at the bottom of the alkali solution preparation tank, and the other end of the horizontal main feed pipe (4) is connected to the discharge pipe (7) at the bottom of the titanium liquid preparation tank; the main pipe of the horizontal main feed pipe (4) is connected to one end of the vertical main feed pipe (5), and the other end of the vertical main feed pipe (5) passes through the mixed feed port at the top of the hydrolysis seed crystal preparation tank (3) and is connected to the branch feed pipe; The branch feed pipe comprises an annular branch feed pipe (8) and a plurality of vertical branch feed pipes (9), wherein the annular branch feed pipe (8) is located at the top of the hydrolysis seed crystal preparation tank (3), and the vertical branch feed pipes (9) are perpendicular to the annular branch feed pipe (8) and extend to the bottom of the hydrolysis seed crystal preparation tank (3); After the alkali solution and the titanium solution are preliminarily mixed in the horizontal main feed pipe (4), they are merged into the annular branch feed pipe (8) through the vertical main feed pipe (5), and then flow to each of the vertical branch feed pipes (9) in a uniform and dispersed manner, thereby entering the hydrolysis seed crystal preparation tank (3) in a steady flow mixing manner.

2. The preparation device according to claim 1, characterized in that The main feed pipe is an integrally formed structure or a detachable multi-section structure, and each section is connected by a flange or thread.

3. The preparation device according to claim 1 or 2, characterized in that: The main pipe of the horizontal main feed pipe (4) and one end of the vertical main feed pipe (5) are connected by welding or flange.

4. The preparation device according to claim 3, characterized in that One end of the horizontal main feed pipe (4) is connected to the discharge pipe (6) at the bottom of the alkali solution preparation tank by welding or flange connection; the other end of the horizontal main feed pipe (4) is connected to the discharge pipe (7) at the bottom of the titanium liquid preparation tank by welding or flange connection.

5. The preparation device according to claim 3, characterized in that: The other end of the vertical main feed pipe (5) is connected to the annular branch feed pipe (8) by welding or flange.

6. The preparation device according to claim 3, characterized in that: One or more fixing members (13) are provided between the branch feed pipe and the inner wall of the hydrolysis seed crystal preparation tank (3), thereby ensuring that the branch feed pipe is firmly fixed to the tank body of the hydrolysis seed crystal preparation tank (3) to prevent shaking or falling off under the impact of the material fluid.

7. The preparation device according to claim 5, characterized in that: The annular branch feed pipe (8) is provided with a plurality of connection ports symmetrically distributed along the circumference, so that each vertical branch feed pipe (9) is sealed and fixed to the corresponding connection port by welding and flange, or the annular branch feed pipe (8) and the vertical branch feed pipe (9) are an integrated molding structure to ensure that the mixed liquid will not leak during the transportation process.

8. The preparation device according to claim 5, characterized in that: The number of the vertical feed pipes (9) is 2, 4, 6, 8 or more.

9. The preparation device according to claim 1 or 2, characterized in that: The centers of the alkali solution preparation tank (1), the titanium liquid preparation tank (2), and the hydrolysis seed crystal preparation tank (3) are respectively provided with stirring paddles, each of which is in the shape of a stainless steel blade and is driven by an external motor located above the tank body to control the stirring rate and time, thereby ensuring that the materials are evenly mixed in the tank body.

10. The preparation device according to claim 9, characterized in that: The inner walls of the alkali solution preparation tank (1), the titanium liquid preparation tank (2) and the hydrolysis seed crystal preparation tank (3) are respectively surrounded by steam heating coils, which are heated to a set temperature by steam to maintain the required temperature of the tank body.

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