Continuous premixing container and production device for titanium dioxide by sulfuric acid method

Abstract

The application relates to the technical field of titanium dioxide production equipment, in particular to a sulfuric acid method titanium dioxide continuous premixing container and production device. The premixing container comprises a container body, a ring groove and a stirring assembly; a mineral powder and liquid feeding interface is arranged at the top of the container body; the ring groove is arranged in the container body, a plurality of discharge holes are uniformly distributed on the ring groove in the circumferential direction, and the liquid falls into the ring groove through the interface and is discharged into the container body through the discharge holes; and the circulating stirring interface of the stirring assembly is arranged on the container body in an inclined mode and is used for connecting a circulating stirring pump to convey the extracted material back to the container body. The premixing container realizes material circulating stirring through the connection of the circulating stirring interface and the pump, breaks the traditional limitation, promotes the sufficient mixing of the mineral powder and sulfuric acid and the like, improves uniformity, and combines the uniform distribution of the ring groove and the circulating stirring to make the material fully flow, eliminate mixing dead angles, improve mixing efficiency and effect.

Description

Technical Field

[0001] This application relates to the field of titanium dioxide production equipment technology, and more specifically, to a continuous premixing container and production apparatus for sulfuric acid process titanium dioxide. Background Technology

[0002] Titanium dioxide is an important chemical raw material, and its production process has a decisive impact on product quality. In the production of titanium dioxide, the premixing of raw materials is a crucial initial step, directly affecting the effectiveness of subsequent processes such as hydrolysis and calcination. Currently, mechanical stirring premixing devices are commonly used in industrial production. These devices use the rotational motion of stirring blades to initially mix raw materials such as titanium ore powder and concentrated sulfuric acid.

[0003] Existing premixing devices typically consist of a mixing tank, a drive motor, a stirring shaft, and impellers. During operation, the drive motor rotates the stirring shaft, and the multi-layered impellers mounted on the shaft shear and stir the raw materials. However, due to the significant differences in physical properties between titanium ore powder and concentrated sulfuric acid, and the obvious stratification during stirring, achieving ideal mixing uniformity is difficult. Particularly, mixing dead zones easily form in the corners of the mixing tank, preventing some raw materials from participating in effective mixing cycles. This uneven mixing state leads to incomplete subsequent hydrolysis reactions, affecting key performance indicators of titanium dioxide products such as whiteness and hiding power. Utility Model Content

[0004] The purpose of this application is to provide a continuous premixing container for sulfuric acid process titanium dioxide and a production apparatus for sulfuric acid process titanium dioxide, wherein the materials in the continuous premixing container for sulfuric acid process titanium dioxide can be fully mixed.

[0005] To achieve the above objectives, in a first aspect, this application provides a continuous premixing container for sulfuric acid process titanium dioxide, comprising: The container body has a mineral powder inlet and a liquid inlet on its top. An annular groove is provided in the container body, and multiple discharge holes are evenly distributed around the annular groove. Liquid entering from the liquid inlet falls into the annular groove and is discharged into the container body through the multiple discharge holes. A stirring assembly includes a circulating stirring port disposed on the container body and inclined relative to the vertical direction. The circulating stirring port is connected to a circulating stirring pump and is used to transport the material drawn from the container body by the circulating stirring pump back into the container body.

[0006] In an optional embodiment, a tapered sleeve is further included, wherein the two ends of the tapered sleeve are a first end and a second end, and the inner diameter of the first end is larger than the inner diameter of the second end. The container body is provided with a circumferential inner wall, the first end is connected to the inlet of the circulating stirring interface, and the second end is used to discharge materials tangentially along the inner wall of the container body.

[0007] In an optional embodiment, a temperature control component is also included, which is disposed on the outer wall of the container body for adjusting the reaction temperature of the material in the container body.

[0008] Secondly, the sulfuric acid process titanium dioxide production apparatus provided in this application includes: The continuous premixing container for sulfuric acid titanium dioxide as described in any of the foregoing embodiments is connected to a mineral powder source and a sulfuric acid source. A feed container connected to the premix container and receiving and storing the materials in the premix container; A reaction vessel connected to the feed container and used to receive and store materials in the feed container, the reaction vessel being provided with a biaxial stirring blade for stirring materials, the reaction vessel being configured to have an arc-shaped inner wall and a horizontal axis; A primary dissolving container connected to the reaction vessel and a secondary dissolving container connected to the primary dissolving container; The premixing container supplies material to the middle part of the reaction vessel, the twin-shaft stirring blades drive the material to the end of the reaction vessel, and the reaction vessel discharges material from the end to the primary dissolving container.

[0009] In an optional embodiment, the bottom of the secondary dissolving container is provided with a first circulation pipeline connected to the primary dissolving container, the first circulation pipeline being used to transport the material in the secondary dissolving container back to the primary dissolving container.

[0010] In an optional embodiment, the mineral powder source includes a silo and an auger conveyor. The silo stores mineral powder, and the auger conveyor connects the silo and the premixing container. The auger conveyor is used to transport the mineral powder from the silo to the premixing container.

[0011] In an optional embodiment, the feeding container, the primary dissolving container, and the secondary dissolving container are provided with temperature control components.

[0012] In an optional embodiment, a stirring assembly is provided in the feeding container, the primary dissolving container, and the secondary dissolving container.

[0013] In an optional embodiment, the secondary dissolving container is provided with an overflow port for discharging the material in the secondary dissolving container.

[0014] In an optional embodiment, the reaction vessel is connected to a dissolving liquid source, which supplies a dissolving liquid for dissolving materials to the middle portion of the reaction vessel.

[0015] The continuous premixing container provided in this application has a circulating stirring interface connected to a circulating stirring pump, realizing material circulation and stirring, breaking the limitations of traditional stirring devices, promoting the full mixing of materials such as mineral powder and sulfuric acid, and improving mixing uniformity. At the same time, the combination of uniform material distribution in the annular groove and circulating stirring allows the material to flow fully in the container body, eliminating mixing dead zones and improving mixing efficiency and effect.

[0016] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of one embodiment of the continuous premixing container for sulfuric acid titanium dioxide provided in this application; Figure 2 A cross-sectional view of a partial structure of one embodiment of the continuous premixing container for sulfuric acid process titanium dioxide provided in this application; Figure 3 A two-view structural schematic diagram of one embodiment of the continuous premixing container for sulfuric acid process titanium dioxide provided in this application; Figure 4 This is a schematic diagram of one embodiment of the sulfuric acid process titanium dioxide production apparatus provided in this application.

[0019] icon: 100 - Continuous premixing container for titanium dioxide produced by sulfuric acid process; 110 - Container body; 120 - Circulating stirring port; 130 - Conical sleeve; 140 - Mineral powder inlet port; 150 - Liquid inlet port; 160 - Annular groove; 200 - Mineral powder source; 210 - Silo; 220 - Screw conveyor; 230 - Sulfuric acid source; 300 - Feeding container; 400 - Reaction vessel; 410 - Twin-shaft stirring impeller; 500 - First-class dissolving container; 600 - Secondary dissolving container; 610 - Overflow port; 620 - First circulation pipeline; 700 - Stirring component; 800 - Temperature control component. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] like Figures 1 to 3 As shown, in a first aspect, embodiments of this application provide a continuous premixing container 100 for sulfuric acid process titanium dioxide, including a container body 110, an annular groove 160 and a stirring assembly 700.

[0024] like Figure 2 As shown, the top of the container body 110 is provided with a mineral powder inlet 140 and a liquid inlet 150. The container body 110 receives mineral powder through the mineral powder inlet 140 and receives liquid, such as sulfuric acid, through the liquid inlet 150.

[0025] like Figure 2As shown, the annular groove 160 is disposed in the container body 110 and its position corresponds to the outlet position of the liquid inlet 150 in the container body 110. Multiple discharge holes are evenly distributed around the annular groove 160. Liquid entering the container body 110 from the liquid inlet 150 falls into the annular groove 160 and is discharged into the container body 110 through the multiple discharge holes, so that sulfuric acid can be evenly distributed in the mineral powder in the container body 110, promoting the full mixing of mineral powder and sulfuric acid.

[0026] The stirring component 700 is installed in the container body 110 for stirring the materials in the container body 110.

[0027] The mixing assembly 700 includes a circulating mixing port 120, which is disposed on the container body 110 and is inclined relative to the vertical direction. The circulating mixing port 120 is connected to a circulating mixing pump and is used to transport the material drawn from the container body 110 by the circulating mixing pump back to the container body 110. The circulating mixing pump continuously draws material from the container body 110 and transports it back to the container body 110 through the circulating mixing port 120, realizing continuous circulation and mixing of the material. This circulating mixing method breaks through the limitations of traditional mixing devices that rely solely on local mixing by the mixing blades, enabling the material in different locations within the container to flow and exchange fully, further promoting the thorough mixing of materials such as mineral powder and sulfuric acid, and improving the uniformity of mixing.

[0028] In another embodiment, the circulating stirring pump is connected to a downstream container, such as a... Figure 4 The material in the feeding container 110 can be transported to the downstream feeding container 300. The circulating stirring pump draws the material from the feeding container 300 and pumps it back to the container body 110 through the circulating stirring interface 120.

[0029] The annular groove 160 changes the situation where the liquid directly enters the container in the traditional premixing device, which may cause the local concentration to be too high or too low. It allows the sulfuric acid to be distributed more evenly in the mineral powder, providing good initial conditions for the full mixing of mineral powder and sulfuric acid. It effectively solves the problem of unsatisfactory mixing uniformity caused by the large difference in physical properties between titanium ore powder and concentrated sulfuric acid and the easy stratification during stirring.

[0030] Traditional premixing devices often create mixing dead zones in the corners of the mixing tank, preventing some raw materials from participating in effective mixing and circulation. However, the circulating mixing achieved in this application through the uniform distribution of materials in the annular groove 160 and the circulating mixing interface 120 allows the materials to flow fully throughout the entire container body 110, preventing material accumulation and stagnation in the corners, effectively eliminating mixing dead zones, ensuring all raw materials participate in the mixing process, and improving mixing efficiency and effectiveness.

[0031] Uneven mixing can lead to incomplete hydrolysis, affecting key performance indicators of titanium dioxide products such as whiteness and hiding power. The premixing container of this application improves the uniformity of raw material mixing, providing a higher quality raw material base for subsequent hydrolysis and calcination processes. This helps ensure the full progress of the hydrolysis reaction, thereby improving the whiteness and hiding power of titanium dioxide products and enhancing product quality.

[0032] like Figure 2 and Figure 3 As shown, in one embodiment, the premixed container further includes a conical sleeve 130, the two ends of which are a first end and a second end, respectively, and the inner diameter of the first end is larger than the inner diameter of the second end.

[0033] The container body 110 is provided with a circumferential inner wall, and the first end is fixedly connected to the inlet of the circulating stirring interface 120. The fixing method is, for example, welding, snap-fitting, riveting or bolting.

[0034] For example, the circulating mixing port 120 is configured as a flange structure so that the first end can be connected to the circulating mixing pump via a pipe.

[0035] The second end is used to discharge material tangentially along the inner wall of the container body 110, causing the material to impact the inner wall of the container body 110 at an inclined angle and direction. After the material collides with the inner wall, its trajectory and velocity distribution change, which can break the original aggregation state of the material and make the material more widely dispersed in the container, thereby fully contacting and mixing with other surrounding materials, effectively improving the uniformity of material mixing; and the inner wall of the container body 110 can reduce scaling after being impacted by the material.

[0036] In this application, since the inner diameter of the first end of the conical sleeve 130 is larger than the inner diameter of the second end, according to the principles of fluid dynamics, as the material passes through the conical sleeve 130, the cross-sectional area gradually decreases, the flow velocity increases, and the pressure also increases accordingly. The material discharged from the second end has greater pressure and velocity. This high-speed, high-energy material flow, after impacting the inner wall of the container body 110, can generate stronger turbulence and stirring effects, further promoting the mixing between materials and making the mixing effect more significant.

[0037] In this application, when the material is discharged from the second end of the conical sleeve 130, it can simultaneously mix with the mineral powder discharged from the mineral powder feed interface 140 and the sulfuric acid discharged from the annular groove 160. This method of rapid convergence and mixing of multiple materials in the same area reduces the mixing time and path, avoids the problem of insufficient mixing that may be caused by the dispersion and mixing of materials in different areas, and greatly improves the mixing efficiency. This allows raw materials such as mineral powder and sulfuric acid to reach a uniform mixing state more quickly, providing good conditions for subsequent production processes.

[0038] like Figure 4 As shown, in one embodiment, the premixed container further includes a temperature control component 800, which is disposed on the outer wall of the container body 110 for adjusting the reaction temperature of the materials in the container body 110.

[0039] The temperature control assembly 800 includes a first heat exchange medium tube wound around the outer wall of the container body 110. Temperature control of the container body 110 and the material within it is achieved by introducing a heat exchange medium into the first heat exchange medium tube. For example, ... Figure 4 As shown, the heat exchange medium is cold water, and the temperature of the cold water is lower than the temperature of the container body 110. Of course, in other embodiments, the heat exchange medium is alcohol, air, etc. In another embodiment, the temperature control component 800 includes a first fan, which rotates to accelerate the airflow speed on the outer wall of the container body 110, thereby reducing the temperature of the container body 110 and the material.

[0040] like Figure 4 As shown, in a second aspect, embodiments of this application also provide a sulfuric acid process titanium dioxide production apparatus, including a continuous premixing container 100, a feeding container 300, a reaction container 400, a primary dissolving container 500, and a secondary dissolving container 600 for sulfuric acid process titanium dioxide as described in any of the above embodiments.

[0041] The premixing container is connected to a mineral powder source 200 and a sulfuric acid source 230. The mineral powder source 200 is used to supply mineral powder to the premixing container, and the sulfuric acid source 230 is used to supply sulfuric acid to the premixing container.

[0042] The feeding container 300 is connected to the premixing container via a valve body and receives and stores the material in the premixing container.

[0043] The reaction vessel 400 is connected to the feed vessel 300 via a pump and valve body, and is used to receive and store materials in the feed vessel 300.

[0044] The reaction vessel 400 is equipped with a twin-shaft stirring blade 410 for stirring materials, which ensures that the materials are fully stirred and reacted.

[0045] The reaction vessel 400 is configured to have an arc-shaped inner wall and a horizontal axis.

[0046] The primary dissolving container 500 is connected to the reaction container 400. The material in the reaction container 400 can be continuously discharged into the primary dissolving container 500 by the drive of the twin-shaft stirring blades 410, so that new material can be continuously introduced into the reaction container 400 to achieve the effect of continuous production.

[0047] The secondary dissolving container 600 is connected to the primary dissolving container 500. The material in the primary dissolving container 500 can be discharged into the secondary dissolving container 600. After the material in the secondary dissolving container 600 is discharged, it enters the next process.

[0048] During use, the premixing container supplies material to the middle part of the reaction vessel 400, and the twin-shaft stirring blades 410 drive the material to the end of the reaction vessel 400. The reaction vessel 400 discharges material from the end to the primary dissolving vessel 500.

[0049] Exemplarily, the reaction vessel 400 has two ends, and two primary dissolving vessels 500 are provided; one primary dissolving vessel 500 is connected to one end of the reaction vessel 400 and is also connected to the secondary dissolving vessel 600; the other primary dissolving vessel 500 is connected to the other end of the reaction vessel 400 and is also connected to the secondary dissolving vessel 600; the twin-shaft stirring blades 410 rotate to drive the material to both ends of the reaction vessel 400 and into the two primary dissolving vessels 500 respectively, while a water source is introduced into the primary dissolving vessels 500, providing tap water to the primary dissolving vessels 500. The water source is connected to both primary dissolving vessels 500 respectively.

[0050] For example, the primary dissolving container 500, the secondary dissolving container 600, the reaction container 400, and the feeding container 300 are provided with exhaust gas absorption ports.

[0051] In order to ensure that the material is fully dissolved, such as Figure 4 As shown, in one embodiment, the bottom of the secondary dissolving container 600 is provided with a first circulation pipeline 620 connected to the primary dissolving container 500; the material in the primary dissolving container 500 is discharged into the secondary dissolving container 600, a portion of the material in the secondary dissolving container 600 is discharged into the next process (e.g., a reduction tank), and another portion of the material is transported back to the primary dissolving container 500 through the first circulation pipeline 620, so that the material can be further reacted in the primary dissolving container 500.

[0052] like Figure 4 As shown, in one embodiment, the mineral powder source 200 includes a hopper 210 and an auger conveyor 220.

[0053] The silo 210 stores mineral powder and can also accept the entry of mineral powder from outside the silo 210.

[0054] Screw conveyor 220 connects hopper 210 and premix container, and is used to convey mineral powder in hopper 210 to premix container. Exemplarily, screw conveyor 220 conveys material to container body 110.

[0055] For example, sulfuric acid source 230 is capable of delivering sulfuric acid to container body 110.

[0056] like Figure 4 As shown, in one embodiment, temperature control components are provided on the feeding container 300, the primary dissolving container 500, and the secondary dissolving container 600.

[0057] The temperature control assembly includes a second heat exchange medium tube, which is wound around the outer walls of the feeding container 300, the primary dissolving container 500, and the secondary dissolving container 600. Temperature control of the feeding container 300, the primary dissolving container 500, and the secondary dissolving container 600 is achieved by circulating a heat exchange medium into the second heat exchange medium tube. For example, ... Figure 4 As shown, the heat exchange medium is cold water, and the temperature of the cold water is lower than the temperature of the corresponding container; of course, in other embodiments, the heat exchange medium is alcohol, air, etc. In another embodiment, the temperature control component includes a second fan, which rotates to accelerate the airflow speed on the outer wall of the container, thereby achieving the effect of reducing the material temperature.

[0058] like Figure 4 As shown, in one embodiment, a stirring assembly 700 is provided in the feeding container 300, the primary dissolving container 500 and the secondary dissolving container 600. The stirring assembly 700 includes stirring blades and a motor for driving the stirring blades to rotate.

[0059] like Figure 4 As shown, in one embodiment, the top of the secondary dissolving container 600 is provided with an overflow port 610, which is used to discharge the material in the secondary dissolving container 600 to the next process (the material is discharged into the reduction tank, for example).

[0060] like Figure 4 As shown, in one embodiment, the reaction vessel 400 is connected to a dissolving liquid source, which supplies a dissolving liquid for dissolving materials to the middle part of the reaction vessel 400. The dissolving liquid is, for example, sulfuric acid, which is introduced into the reaction vessel 400. The dissolving liquid can also be water, and a water source supplies water into the reaction vessel 400.

[0061] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A continuous premixing container for sulfuric acid process titanium dioxide, characterized in that, include: The container body (110) is provided with a mineral powder inlet (140) and a liquid inlet (150) on its top. An annular groove (160) is provided in the container body (110). Multiple discharge holes are evenly distributed around the annular groove (160). Liquid entering from the liquid inlet (150) falls into the annular groove (160) and is discharged into the container body (110) through the multiple discharge holes. A stirring assembly (700) includes a circulating stirring port (120) disposed on the container body (110). The circulating stirring port (120) is inclined relative to the vertical direction. The circulating stirring port (120) is connected to a circulating stirring pump and is used to transport the material drawn by the circulating stirring pump back to the container body (110).

2. The continuous premixing container for sulfuric acid process titanium dioxide according to claim 1, characterized in that, It also includes a tapered sleeve (130), the two ends of which are a first end and a second end, respectively, and the inner diameter of the first end is larger than the inner diameter of the second end; The container body (110) is provided with a circumferential inner wall, the first end is connected to the inlet of the circulating stirring interface (120), and the second end is used to discharge materials tangentially along the inner wall of the container body (110).

3. The continuous premixing container for sulfuric acid process titanium dioxide according to claim 1, characterized in that, It also includes a temperature control component (800), which is disposed on the outer wall of the container body (110) for adjusting the reaction temperature of the material in the container body (110).

4. A sulfuric acid process titanium dioxide production apparatus, characterized in that, include: The continuous premixing container (100) for sulfuric acid titanium dioxide as described in any one of claims 1 to 3, wherein the premixing container is connected to a mineral powder source (200) and a sulfuric acid source (230). A feed container (300) connected to the premix container and receiving and storing materials in the premix container. A reaction vessel (400) is connected to the feed container (300) and used to receive and store materials in the feed container (300). The reaction vessel (400) is provided with a biaxial stirring blade (410) for stirring materials. The reaction vessel (400) is configured to have an arc-shaped inner wall and a horizontal axis. A primary dissolving container (500) connected to the reaction vessel (400) and a secondary dissolving container (600) connected to the primary dissolving container (500). The premixing container supplies material to the middle part of the reaction vessel (400), the twin-shaft stirring blades (410) drive the material to the end of the reaction vessel (400), and the reaction vessel (400) discharges material from the end to the primary dissolving vessel (500).

5. The sulfuric acid process titanium dioxide production apparatus according to claim 4, characterized in that, The bottom of the secondary dissolving container (600) is provided with a first circulation pipeline (620) connected to the primary dissolving container (500). The first circulation pipeline (620) is used to transport the material in the secondary dissolving container (600) back to the primary dissolving container (500).

6. The sulfuric acid process titanium dioxide production apparatus according to claim 4, characterized in that, The mineral powder source (200) includes a silo (210) and an auger conveyor (220). The silo (210) stores mineral powder, and the auger conveyor (220) connects the silo (210) and the premix container. The auger conveyor (220) is used to transport the mineral powder in the silo (210) to the premix container.

7. The sulfuric acid process titanium dioxide production apparatus according to claim 4, characterized in that, Temperature control components are provided on the feeding container (300), the primary dissolving container (500), and the secondary dissolving container (600).

8. The sulfuric acid process titanium dioxide production apparatus according to claim 4, characterized in that, The feeding container (300), the primary dissolving container (500) and the secondary dissolving container (600) are equipped with stirring components (700).

9. The sulfuric acid process titanium dioxide production apparatus according to claim 4, characterized in that, The secondary dissolving container (600) is provided with an overflow port (610), which is used to discharge the material in the secondary dissolving container (600).

10. The sulfuric acid process titanium dioxide production apparatus according to claim 4, characterized in that, The reaction vessel (400) is connected to a dissolving liquid source, which supplies dissolving liquid for dissolving materials to the middle part of the reaction vessel (400).

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