Titanium recovery device and sulfuric acid method titanium dioxide acidolysis equipment

Abstract

This application provides a titanium recovery device and a sulfuric acid process titanium dioxide acidolysis equipment, relating to the field of titanium dioxide production technology. The titanium recovery device includes a pulping component and a sorting component. The pulping component includes a primary filter press and a first pulping tank. The tailings slurry from the titanium dioxide acidolysis is fed into the primary filter press, which is connected to the material in the first pulping tank. The sorting component includes a spiral chute and at least one magnetic separator. The magnetic separator is connected to the material in the first pulping tank, and the spiral chute is connected to the material in the magnetic separator. The magnetic separator and the spiral chute are sequentially located downstream of the titanium removal process. The titanium recovery device of this application first performs filter pressing and pulping on the tailings to control the degree of liberation of mineral monomers in the tailings and to make the raw material properties in the tailings more uniform. Then, two stages of magnetic separation and gravity separation are performed to effectively extract the titanium-containing material from the tailings, reducing the titanium content in the tailings, resulting in better recovery effect and better stability.

Description

Technical Field

[0001] This application relates to the field of titanium dioxide production technology, and more specifically, to a titanium recovery device and a sulfuric acid process titanium dioxide acidolysis equipment. Background Technology

[0002] The acidolysis of titanium dioxide in the sulfuric acid process is a key chemical reaction step in the production of titanium dioxide. Its purpose is to convert the titanium element in the titanium-containing raw materials into water-soluble titanium oxysulfate or titanium sulfate through a chemical reaction, preparing qualified intermediate products for subsequent hydrolysis, calcination, and other processes. The tailings after acidolysis in the sulfuric acid process still contain a high titanium content.

[0003] In related technologies, mineral processing is usually used to treat tailings in order to recover titanium from them. However, the recovery rate is usually low, and there are still problems such as high requirements for the degree of liberation of mineral monomers, difficulty in fine-grained recovery, and poor stability due to the large influence of raw material property fluctuations on the recovery effect. Utility Model Content

[0004] In order to at least address some of the deficiencies mentioned in the related technologies, this application provides a titanium recovery device and a sulfuric acid process titanium dioxide acidolysis equipment.

[0005] To achieve the above objectives, this application provides a titanium recovery device for reducing the titanium content in the tailings of the sulfuric acid process for titanium dioxide acidolysis. The titanium recovery device includes a pulping assembly and a sorting assembly. The pulping assembly includes a primary filter press and a first pulping tank. The tailings slurry from the titanium dioxide acidolysis is fed into the primary filter press, which is in communication with the material in the first pulping tank. The sorting assembly includes a spiral chute and at least one magnetic separator. The magnetic separator is in communication with the material in the first pulping tank, and the spiral chute is in communication with the material in the magnetic separator. The magnetic separator and the spiral chute are sequentially located downstream of the titanium removal process.

[0006] Furthermore, the sorting assembly also includes a concentrate filter press, the concentrate produced by which is transported to the titanium dioxide production system. Both the magnetic separator and the spiral chute are connected to the concentrate filter press to transport the concentrate slurry to the concentrate filter press.

[0007] Furthermore, at least two magnetic separators are provided before the spiral chute, and multiple magnetic separators are connected in sequence. The magnetic separators closest to the spiral chute are connected to the material in the spiral chute, which is used to discharge the tailings slurry after magnetic separation by multiple magnetic separators to the spiral chute.

[0008] Furthermore, each of the magnetic separators is connected to the concentrate filter press for conveying the magnetically separated concentrate slurry to the concentrate filter press.

[0009] Furthermore, each of the magnetic separators is provided with a water inlet for adding water to the magnetic separator for magnetic separation operations.

[0010] Furthermore, at least one spiral chute is provided, and multiple spiral chutes are arranged adjacently and connected to each other. The spiral chute closest to the magnetic separator is connected to the material of the magnetic separator and is used to receive the tailings slurry conveyed by the magnetic separator.

[0011] Furthermore, a tailings treatment component is provided downstream of the sorting component, the tailings treatment component including a secondary filter press. The spiral chute has an opening facing the secondary filter press for conveying tailings slurry to the secondary filter press.

[0012] Furthermore, both the primary filter press and the secondary filter press are connected to the titanium dioxide production system, and the filtrate produced by the primary filter press and the secondary filter press is fed into the titanium dioxide production system.

[0013] Furthermore, the tailings treatment component includes a second pulping tank, and the secondary filter press is connected to the material in the second pulping tank for conveying the filter cake produced by the secondary filter press into the second pulping tank.

[0014] This application also provides a sulfuric acid process titanium dioxide acidolysis equipment, including a titanium dioxide acidolysis device and a titanium recovery device as described in any of the above embodiments, wherein the titanium recovery device is used to reduce the titanium content in the tailings discharged from the titanium dioxide acidolysis equipment.

[0015] Through the above technical solution, when using the titanium recovery device of this application to treat the tailings of the sulfuric acid process titanium dioxide acidolysis equipment, the tailings are fed into a primary filter press to form a filter cake. After the tailings are pressed and filtered, the filtrate is returned to the acidolysis equipment for continued use, while the filter cake is sent to the first pulping tank. Process water is added to the first pulping tank to pulp the filter cake into a suitable tailings slurry. The tailings slurry is fed into a magnetic separator. After magnetic separation, the selected concentrate slurry is separated from the magnetic separator and reserved for later use. The separated tailings slurry is fed into a spiral chute for further gravity separation. The gravity-separated concentrate slurry is separated and reserved for later use. The remaining tailings slurry undergoes dual separation by the magnetic separator and the spiral chute, resulting in a significant reduction in titanium content.

[0016] The titanium recovery device of this application first performs pressure filtration and pulping on the tailings to control the degree of liberation of mineral monomers in the tailings and make the raw material properties in the tailings more consistent. Then, two-stage magnetic separation and gravity separation are performed to effectively extract the titanium-containing materials in the tailings, reduce the titanium content in the tailings, and achieve better recovery effect and good stability.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the titanium recycling device provided in an embodiment of this application.

[0020] icon: 100-Pulping assembly; 110-Primary filter press; 120-First pulping tank; 200-Sorting assembly; 210-Magnetic separator; 220-Spiral chute; 230-Concentrate filter press; 300-Tailings treatment assembly; 310-Secondary filter press; 320-Second pulping tank. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] This embodiment provides a titanium recovery device to solve the problems in related technologies, such as high titanium content in the tailings of sulfuric acid titanium dioxide acidolysis equipment, low recovery rate, and poor stability of the recovery process.

[0025] Please see Figure 1 This embodiment provides a titanium recovery device for reducing the titanium content in the tailings of the sulfuric acid process for titanium dioxide acid hydrolysis. The titanium recovery device includes a pulping assembly 100 and a sorting assembly 200. The pulping assembly 100 includes a primary filter press 110 and a first pulping tank 120. The tailings slurry from the titanium dioxide acid hydrolysis is fed into the primary filter press 110, and the primary filter press 110 is in material communication with the first pulping tank 120. The sorting assembly 200 includes a spiral chute 220 and at least one magnetic separator 210. The magnetic separator 210 is in material communication with the first pulping tank 120, and the spiral chute 220 is in material communication with the magnetic separator 210. The magnetic separator 210 and the spiral chute 220 are sequentially located downstream of the titanium removal process.

[0026] Specifically, when using the titanium recovery device of this embodiment to treat the tailings of the sulfuric acid process titanium dioxide acidolysis equipment, the tailings are sent to a primary filter press 110 for filtration. The filtrate is returned to the acidolysis equipment for normal production, while the filter cake is sent to a first pulping tank 120. Appropriate process water is added to the first pulping tank 120 to pulp the tailings. The tailings obtained after filter press treatment are solid filter cakes with low moisture content. These filter cakes are typically very dense and compacted, with valuable minerals, such as unreacted ilmenite and titanium slag particles, tightly bonded together with impurities such as magnetic iron minerals, forming lumps or agglomerates. The pulping tank uses process water and agitation structures such as paddles or impellers to break up, disperse, and mix the filter cake. This breaks up the compacted filter cake, fully exposing and releasing the individual mineral particles that were originally encased inside. This results in a slurry with suitable concentration, good fluidity, and uniform particle distribution.

[0027] Magnetic separator 210 is a mechanical device that separates materials based on differences in their magnetic properties. Under the influence of a magnetic field, particles with different magnetic properties experience different magnetic forces, resulting in different trajectories and ultimately separating magnetic and non-magnetic materials. After obtaining a homogeneous slurry, the slurry is fed into the magnetic separator 210 of the separation component 200. The magnetic field precisely adsorbs only individual magnetic particles in the slurry, while non-magnetic particles flow away with the slurry. This greatly improves the precision and selectivity of the separation, preventing non-magnetic materials from being carried away by magnetic materials or magnetic materials from being trapped and not adsorbed.

[0028] The spiral sluice 220 is a gravity separation device that uses gravity and centrifugal force to separate mineral particles based on differences in density, size, and shape within an inclined spiral sluice. The slurry after magnetic separation typically contains primarily dense titanium-bearing minerals and less dense silicates and quartz. Upon entering the spiral slurry, the slurry begins to flow downwards due to gravity and is guided by the sluice wall, forming a spiral swirling flow. Under centrifugal force, the denser, coarser titanium-bearing minerals experience a greater outward thrust and tend to move towards the outer edge of the sluice. The less dense, finer gangue such as quartz experiences less centrifugal force and is more affected by the inward drag force of the water flow, tending to aggregate towards the inner edge of the sluice, thus achieving the separation of titanium-bearing materials from other materials.

[0029] In this embodiment of the titanium recovery device, the tailings from the sulfuric acid process titanium dioxide acidolysis equipment are first filtered and pulped to make the degree of dissociation of the mineral monomers more uniform and to turn the tailings into a homogeneous slurry. Then, the slurry is subjected to magnetic separation and gravity separation in sequence through a magnetic separator 210 and a spiral chute 220. Compared with the recovery methods in related technologies, the recovery method in this embodiment is less affected by the properties of the raw materials, the degree of dissociation of the mineral monomers is similar, the overall stability is stronger, and the recovery rate is higher.

[0030] In one embodiment, exemplarily, such as Figure 1 As shown, the sorting assembly 200 also includes a concentrate filter press 230, from which the concentrate is transported to the titanium dioxide production system. Both the magnetic separator 210 and the spiral chute 220 are connected to the concentrate filter press 230 to transport the concentrate slurry. The concentrate slurry produced from the magnetic separator 210 and the spiral chute 220 is a high-moisture slurry. This slurry is bulky, with extremely high storage and transportation costs, making it difficult to directly input into the main production process. The concentrate filter press 230 uses high-pressure extrusion to filter out most of the water from the concentrate, obtaining a filter cake with lower moisture content. This facilitates temporary storage or transportation within the plant area, and can also be directly returned to the acidolysis process as raw material without significantly interfering with the acid concentration and material balance of the acidolysis process.

[0031] Large amounts of process water are used in wet separation processes such as pulping, magnetic separation, and gravity separation. If this water is returned to the main process along with the concentrate or discharged as wastewater, it will result in water waste and potential pollution. The concentrate filter press 230 produces a large amount of filtrate during the dewatering process. After simple clarification or without filtration, the filtrate can be pumped back to the pulping tank or other parts of the system that require water, as a supplement to primary water or process water. This significantly reduces fresh water consumption, decreases wastewater discharge, meets environmental protection requirements for water conservation and emission reduction, and lowers production costs.

[0032] In one embodiment, exemplarily, such as Figure 1As shown, at least two magnetic separators 210 are arranged before the spiral chute 220. Multiple magnetic separators 210 are connected sequentially, and the magnetic separator 210 closest to the spiral chute 220 is connected to the material in the spiral chute 220, used to discharge the tailings slurry after magnetic separation by multiple magnetic separators 210 into the spiral chute 220. A single magnetic separator 210 is unlikely to achieve a high removal rate of magnetic materials. Partial reasons include the possibility that some iron-containing minerals may form intergrowths with titanium minerals or gangue, resulting in weak overall magnetism and possibly not being completely captured by the first stage of magnetic separation; or that a small amount of iron minerals may be encased within non-magnetic particles; or that if the feed concentration or magnetic material content is too high, a single magnetic separator 210 may be overloaded, leading to the loss of some magnetic material. In this embodiment, multiple magnetic separators 210 are arranged. The main task of the first stage magnetic separator 210 is to quickly remove most of the strongly magnetic iron minerals, reducing the processing load on subsequent equipment. The subsequent magnetic separator 210 performs deep scavenging on the tailings from the first stage again, specifically capturing those residual magnetic iron impurities that were missed in the first stage for various reasons, which are of low content but still valuable, thereby improving the magnetic separation effect of this embodiment.

[0033] In one embodiment, exemplarily, such as Figure 1 As shown, each magnetic separator 210 is connected to the concentrate filter press 230 to transport the magnetically separated concentrate slurry to the concentrate filter press 230. The slurry produced by each magnetic separator 210 can be continuously and stably transported to the filter press, avoiding drastic fluctuations in feed flow and concentration caused by centralized discharge or batch processing, which is conducive to the stable and efficient operation of the filter press. In actual production, the conveying rhythm of each slurry can be flexibly adjusted according to the processing capacity of the filter press and the production status of each magnetic separator 210 to achieve balanced production.

[0034] The concentrate slurry produced by the magnetic separator 210 does not need to be collected in an intermediate storage tank before being pumped to the filter press, reducing equipment investment and floor space. Reducing intermediate steps also lowers the risk of slurry settling and caking in the storage tank, leading to pipe blockages. It also reduces the number of equipment and pipeline connection points requiring maintenance.

[0035] In one embodiment, exemplarily, such as Figure 1As shown, each magnetic separator 210 is equipped with a water inlet for adding water to supply water for magnetic separation. When magnetic particles are adsorbed onto the rotating drum surface of the magnetic separator 210, they leave the magnetic field area as the drum rotates. At this time, high-pressure or directional water jets from the water inlet thoroughly wash these magnetic particles off and send them to the concentrate collection tank. This prevents the entrainment of non-magnetic materials, which could contaminate the non-magnetic product and reduce the grade of the titanium concentrate in subsequent gravity separation. It also prevents magnetic particles from accumulating on the drum, affecting subsequent adsorption effects and even causing equipment malfunctions. Furthermore, it ensures that all captured magnetic iron can be effectively recovered, increasing the total iron recovery rate, which indirectly improves the titanium recovery rate in subsequent processes.

[0036] The operating conditions of the different sections of the magnetic separator 210 are completely different. Specifically, the first section of the magnetic separator has a high feed concentration and a large content of magnetic materials. It requires a large flow rate and high pressure of flushing water to forcefully flush away a large amount of magnetic materials. The subsequent sections of the magnetic separator 210 have a low feed concentration and a small and fine content of magnetic materials. They require a smaller flow rate and more precise control of the flushing water to avoid the water flow being too large and breaking up the fine magnetic particles or interfering with the separation flow, resulting in the loss of magnetic materials. Each magnetic separator 210 is independently equipped with a water inlet, and each water inlet can be equipped with an independent valve and flow meter. Operators can independently and precisely adjust the flow rate, pressure, and spray angle of the flushing water according to the specific operating conditions of the section of the magnetic separator 210, such as feed concentration, magnetic material load, and concentrate yield, thereby maximizing the overall efficiency of the entire magnetic separation system.

[0037] In one embodiment, exemplarily, such as Figure 1 As shown, at least one spiral chute 220 is provided, and multiple spiral chute 220s are arranged adjacently and connected to each other. The spiral chute 220 closest to the magnetic separator 210 is connected to the material of the magnetic separator 210 and is used to receive the tailings slurry conveyed by the magnetic separator 210. The processing capacity of a single spiral chute 220 is limited, constrained by its chute width, pitch, number of turns, and installation angle. By operating multiple spiral chute 220s in parallel, tailings slurry from the magnetic separator 210 can be processed simultaneously and concurrently, significantly increasing the total processing capacity of the entire gravity separation process. More material can be processed in the same amount of time, improving production efficiency.

[0038] Multiple spiral sluices 220 can be connected in parallel, or designed in series or combined processes. Specifically, in series, the first spiral sluice 220 receives the slurry after magnetic separation and performs preliminary separation to obtain a relatively low-grade rough concentrate and tailings. Subsequent spiral sluices 220 can feed the rough concentrate from the first sluice into a second sluice for further refining to improve the titanium concentrate grade; or they can feed the tailings from the first sluice into the second sluice for scavenging to recover residual fine titanium minerals and improve the overall recovery rate.

[0039] Of course, combined use is also possible; one sluice can process coarser particles while another processes finer particles. Through fine separation, higher-grade titanium concentrate is produced. Scavenging reduces titanium loss in tailings. Furthermore, this embodiment allows for more precise processing of materials of different particle sizes and grades.

[0040] In one embodiment, exemplarily, such as Figure 1 As shown, a tailings treatment component 300 is located downstream of the sorting component 200, including a secondary filter press 310. An opening is provided on the spiral chute 220 facing the secondary filter press 310 to transport the tailings slurry. The tailings produced from the spiral chute 220 are a thin slurry with high water content. This slurry is bulky, unstable, and prone to forming mud pits, posing risks of dam failure and leakage, and polluting soil and groundwater. The secondary filter press 310 performs high-pressure dewatering on the tailings slurry, pressing it into a filter cake with lower water content, reducing its volume by several times and significantly reducing the need for storage space. The filter cake has a stable shape and can be safely and properly dry-stored, reducing environmental risks and complying with environmental regulations. This reduces land occupation costs, transportation costs, and potential environmental remediation costs, and also facilitates subsequent processing.

[0041] In one embodiment, exemplarily, such as Figure 1 As shown, both the primary filter press 110 and the secondary filter press 310 are connected to the titanium dioxide production system, and the filtrate produced by the primary filter press 110 and the secondary filter press 310 is fed into the titanium dioxide production system. The filtrate from the primary filter press 110 is the liquid filtered out during the acidolysis tailings filtration. Its main components are unreacted dilute sulfuric acid, a small amount of dissolved metal ions, and water. This liquid comes directly from the main acidolysis production process, and its chemical composition is closely related to the acidolysis process. The filtrate from the secondary filter press 310 is the liquid filtered out during tailings treatment. It is mainly process water added during pulping, magnetic separation, and gravity separation. After multiple processes, most of the suspended solids have been removed, and the water quality is relatively good. In this embodiment, the acidic wastewater from the main process and the washing water from the separation process are recovered simultaneously, almost all the process water generated in the entire titanium recovery unit is recovered. This significantly reduces the amount of fresh water that needs to be replenished from the outside, reducing production costs. It also reduces the total amount of wastewater that needs to be discharged and treated at the end of the process.

[0042] The filtrate from filter press 110 contains incompletely utilized sulfuric acid. Sulfuric acid is one of the most expensive raw materials in titanium dioxide production. Returning this acidic filtrate directly to the acidolysis process can replenish some of the sulfuric acid needed for production and reduce the consumption of fresh concentrated sulfuric acid. Furthermore, the ferrous ions and other ions in the filtrate are necessary for the acidolysis process. Returning them can partially replenish the iron source in the system, which is beneficial for the acidolysis reaction.

[0043] In one embodiment, exemplarily, such as Figure 1 As shown, the tailings treatment component 300 includes a second pulping tank 320. A secondary filter press 310 is connected to the second pulping tank 320, used to transport the filter cake produced by the secondary filter press 310 into the second pulping tank 320. The filter cake produced by the secondary filter press 310 is a dense, potentially caking solid mass with low moisture content. Most water treatment technologies, such as chemical precipitation, flocculation, biological treatment, and membrane treatment, require the treated material to be a flowing liquid or a homogeneous slurry. Directly adding solid filter cake into the water treatment system can lead to uneven mixing, resulting in waste of reagents and uneven treatment. The second pulping tank 320 re-disperses and dilutes the filter cake into a homogeneous, free-flowing slurry. This ensures the material morphology fully meets the feed standards of the water treatment process, avoiding the risk of clogging caused by solid masses in the water treatment system, and facilitating continuous and stable feeding via pumping.

[0044] This embodiment also provides a sulfuric acid process titanium dioxide acidolysis equipment, including a titanium dioxide acidolysis device and a titanium recovery device as described in any of the above embodiments. The titanium recovery device is used to reduce the titanium content in the tailings discharged from the titanium dioxide acidolysis equipment.

[0045] The sulfuric acid process titanium dioxide acidolysis equipment in this embodiment includes the titanium recovery device in any of the above embodiments, and thus possesses all the beneficial effects of the titanium recovery device, which will not be elaborated further here.

[0046] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0047] 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 titanium recovery device for reducing the titanium content in the acid hydrolysis tailings of sulfuric acid process titanium dioxide, characterized in that, The titanium recovery device includes: The pulping assembly (100) includes a primary filter press (110) and a first pulping tank (120). The tailings slurry after titanium dioxide acid hydrolysis is fed into the primary filter press (110), and the primary filter press (110) is in material communication with the first pulping tank (120). The sorting component (200) includes a spiral chute (220) and at least one magnetic separator (210). The magnetic separator (210) is connected to the material in the first pulping tank (120), and the spiral chute (220) is connected to the material in the magnetic separator (210). The magnetic separator (210) and the spiral chute (220) are located downstream of the titanium removal process.

2. The titanium recovery device according to claim 1, characterized in that, The sorting assembly (200) also includes a concentrate filter press (230), the concentrate produced by the concentrate filter press (230) being transported to the titanium dioxide production system; The magnetic separator (210) and the spiral chute (220) are both connected to the concentrate filter press (230) to transport the concentrate slurry to the concentrate filter press (230).

3. The titanium recovery device according to claim 2, characterized in that, At least two magnetic separators (210) are provided before the spiral chute (220). Multiple magnetic separators (210) are connected in sequence, and the magnetic separator (210) close to the spiral chute (220) is connected to the material in the spiral chute (220) for discharging the tailings slurry after magnetic separation by multiple magnetic separators (210) to the spiral chute (220).

4. The titanium recovery device according to claim 3, characterized in that, Each of the magnetic separators (210) is in material communication with the concentrate filter press (230) for conveying the magnetically separated concentrate slurry to the concentrate filter press (230).

5. The titanium recovery device according to claim 3, characterized in that, Each of the magnetic separators (210) is provided with a water inlet for adding water to the magnetic separator (210) for magnetic separation operations.

6. The titanium recovery device according to claim 1, characterized in that, At least one spiral chute (220) is provided, and multiple spiral chutes (220) are arranged adjacently and the materials are connected. The spiral chute (220) near the magnetic separator (210) is in material communication with the magnetic separator (210) and is used to receive tailings slurry conveyed by the magnetic separator (210).

7. The titanium recovery device according to claim 1, characterized in that, A tailings treatment component (300) is provided downstream of the sorting component (200), and the tailings treatment component (300) includes a secondary filter press (310). The spiral chute (220) has an opening facing the secondary filter press (310) for conveying tailings slurry to the secondary filter press (310).

8. The titanium recovery device according to claim 7, characterized in that, Both the primary filter press (110) and the secondary filter press (310) are connected to the titanium dioxide production system, and the filtrate produced by the primary filter press (110) and the secondary filter press (310) is fed into the titanium dioxide production system.

9. The titanium recovery device according to claim 7, characterized in that, The tailings treatment component (300) includes a second pulping tank (320), and the secondary filter press (310) is in material communication with the second pulping tank (320) to transport the filter cake produced by the secondary filter press (310) into the second pulping tank (320).

10. A sulfuric acid process titanium dioxide acidolysis device, characterized in that, The invention includes a titanium dioxide acid lysis device and a titanium recovery device as described in any one of claims 1 to 9, wherein the titanium recovery device is used to reduce the titanium content in the tailings discharged from the titanium dioxide acid lysis device.

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