Water-saving titanium dioxide filtering and washing system

Abstract

The invention relates to the field of titanium dioxide production equipment, and discloses a water-saving titanium dioxide filtering and washing system, which comprises a filtering and washing device used for solid-liquid separation and water washing of a process section before metatitanic acid hydrolysis and after coating in a titanium dioxide production process; the feeding hole is formed in one side of the top of the filtering and washing device and is used for introducing materials into the filtering and washing device; the motor is arranged at the top of the filtering and washing device, stirring blades are mounted at the driving end of the motor, and materials are in full contact with water through rotation of the stirring blades; the filter element is arranged in the filtering and washing device, is made of a silicon carbide material and is used for filtering a solid-liquid mixture. By optimizing the filtering and washing process, the production efficiency is greatly improved, and the water resource is efficiently utilized. In addition, when the system is used for washing under the pressure intensity condition, the water consumption of each ton of materials is reduced by five cubic meters, and industrial water is greatly saved.

Description

Technical Field

[0001] The invention relates to the field of titanium dioxide production equipment, in particular to a water-saving titanium dioxide filtering and washing system. Background Art

[0002] In the production process of titanium dioxide, the water washing process is one of the key links to ensure product quality. The traditional water washing process mainly relies on equipment such as plate and frame filter presses or tubular filters, which have many problems in practical applications. For example, although the plate and frame filter press can achieve a certain solid-liquid separation effect, it has a low degree of automation, incomplete unloading, high labor intensity, and often has problems such as leakage and spraying, resulting in serious pollution in the workplace and environmental risks. In addition, the filtration accuracy of traditional filter presses is limited, and it is difficult to effectively process titanium dioxide materials with smaller particle sizes, resulting in low product purity.

[0003] In addition, in the water washing process, traditional equipment consumes a lot of water. Every ton of titanium dioxide produced requires a large amount of fresh water, and the amount of wastewater generated is also large, which increases production costs and environmental treatment pressure. In addition, although there are attempts to use membrane filtration technology to save water and improve yield in the prior art, these technologies are prone to clogging or damage under complex working conditions, resulting in reduced production efficiency. At the same time, some operations in the traditional system require manual intervention, which increases labor intensity and production risks.

[0004] In order to solve the above problems, those skilled in the art have proposed a water-saving titanium dioxide filtering and washing system to solve the above problems. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a water-saving titanium dioxide filtering and washing system, which solves the problems raised by the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A water-saving titanium dioxide filtering and washing system, comprising:

[0007] Filtration and washing device, used for solid-liquid separation and water washing in the process before metatitanic acid hydrolysis and after coating in the titanium dioxide production process;

[0008] A feed inlet, arranged on one side of the top of the filtering and washing device, for introducing materials into the device;

[0009] A motor is arranged on the top of the filtering and washing device, and a stirring blade is installed on the driving end of the motor, and the material is fully contacted with water through the rotation of the stirring blade;

[0010] A filter element, arranged in the filtering and washing device, made of silicon carbide material, and used for filtering the solid-liquid mixture;

[0011] The filtrate outlet is provided on the filtration and washing device and is used to discharge the filtered liquid.

[0012] The backflusher is connected to the filtration and washing device through a pipeline and is used to perform reverse flushing on the filter element.

[0013] The damper is connected to the backflusher and is used to adjust the backflush pressure.

[0014] Preferably, it further includes:

[0015] The negative pressure pump is connected to the filtration and washing device and is used to provide a negative pressure environment during the filtration process to improve the filtration efficiency.

[0016] The water inlet pump is connected to the filtration and washing device and is used to convey water for washing to the filtration and washing device.

[0017] The electric control valve is arranged on the water inlet pipeline of the water inlet pump and is used to adjust the water inlet flow rate.

[0018] Preferably, the working temperature of the filtration and washing device is 50 - 65 °C, the design pressure is 1 - 5 MPa, and the volume can be adjusted according to the material volume to adapt to production requirements of different scales.

[0019] Preferably, the system further includes a regular cleaning device, which is used to perform periodic cleaning on the filtration and washing device.

[0020] Preferably, the filter element is of a multi-layer structure, including a silicon carbide filtration layer and a support layer arranged on its outer side, and the support layer is used to prevent the filter element from deforming during the filtration process.

[0021] Preferably, the filtration and washing device further includes a liquid level sensor arranged inside it, which is used to monitor the liquid level height inside the device in real time and transmit the signal to the control system.

[0022] Preferably, self-control valves are provided at both the feed inlet and the filtrate outlet, and the self-control valves are connected to the control system and are used to control the inlet and outlet of the material and the filtrate.

[0023] Preferably, the backflusher includes a backflush pump and a backflush pipeline connected thereto, and the backflush pipeline extends into the interior of the filter element and is used to directly convey the backflush liquid into the interior of the filter element for reverse flushing.

[0024] Preferably, a discharge port is provided at the bottom of the filtration and washing device, a discharge valve is provided at the discharge port, and the discharge valve is connected to the control system and is used to control the discharge of the filtered solid material.

[0025] Preferably, the system further includes a compressed air device, and the compressed air device is connected to the filtration and washing device through a pipeline and is used to blow the filter element after the water drainage is completed to discharge the residual liquid.

[0026] The present invention provides a water-saving titanium dioxide filtration and washing system, which has the following beneficial effects:

[0027] 1. By optimizing the filtration and water washing processes, the present invention achieves a significant improvement in production efficiency and efficient utilization of water resources. The system uses silicon carbide filter elements with high filtration accuracy, which can effectively handle titanium dioxide materials with smaller particle sizes. At the same time, combined with an automated operation process, a complete filtration and water washing process only takes 1.5 hours, and the output can reach two tons. Compared with the 5-hour process and three-ton output of traditional plate filters, the production efficiency is significantly improved. In addition, when washing under pressure conditions, the water consumption per ton of materials is reduced by five cubic meters, greatly saving industrial water. This highly water-saving design not only reduces production costs but also reduces the impact on the environment, with remarkable creativity and practicality.

[0028] 2. Through a fully automated design, the present invention realizes the entire process from feeding, filtration, water washing to discharging without manual operation, greatly reducing the labor intensity. Compared with traditional plate filters, this system does not require manual discharging and flushing, reducing manual intervention and avoiding material leakage and environmental pollution problems caused by manual operation. At the same time, the system uses closed containers and pipelines for operation, effectively preventing material pollution to the workplace and reducing the need for anti-corrosion treatment of the workplace. In addition, the system uses compressed air backwashing to complete regeneration, which not only extends the service life of the filter element but also further saves water resources. This design significantly improves the working environment while enhancing production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the overall process flow chart of the present invention;

[0030] Figure 2 is the structural schematic diagram of the filtration and washing device of the present invention;

[0031] Figure 3 is the structural schematic diagram of the filter element of the present invention.

[0032] Among them, 1. Filtration and washing device; 2. Backflush device; 3. Damper; 4. Negative pressure pump; 5. Feed water pump; 6. Electric control valve; 101. Filtrate port; 102. Feed port; 103. Motor; 104. Stirring blade; 105. Filter element. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to the attached Figure 1 - attached Figure 3 , the embodiments of the present invention provide a water-saving titanium dioxide filtration and washing system, including:

[0035] A filtration and washing device 1, which is used for solid-liquid separation and water washing in the process of titanium dioxide production before metatitanic acid hydrolysis and after coating;

[0036] Specifically, the filtration and washing device 1 is used for solid-liquid separation and water washing in the process of titanium dioxide production before metatitanic acid hydrolysis and after coating. It removes impurities in titanium dioxide by physical filtration and water washing methods, improving the purity and quality of the product. In the production of titanium dioxide, solid titanium dioxide and liquid mother liquor are produced after metatitanic acid hydrolysis. The filtration and washing device 1 separates the solid titanium dioxide from the liquid mother liquor through the filter element 105 to ensure the smooth progress of subsequent processes.

[0037] A feed inlet 102, which is arranged on one side of the top of the filtration and washing device 1 and is used to introduce materials into the device;

[0038] Specifically, the feed inlet 102 is used to introduce materials into the device. Its design takes into account the fluidity, feeding speed and uniformity of the materials to ensure that the materials can smoothly enter the filtration and washing device 1.

[0039] A motor 103, which is arranged on the top of the filtration and washing device 1. A stirring blade 104 is installed at the driving end of the motor 103. Through the rotation of the stirring blade 104, the materials are fully contacted with water;

[0040] A filter element 105, which is arranged in the filtration and washing device 1 and is made of silicon carbide material for filtering solid-liquid mixtures;

[0041] Specifically, the silicon carbide filter element 105 has high filtration accuracy, high strength and good chemical stability, and can effectively separate solid-liquid mixtures. The filtration accuracy of the silicon carbide filter element 105 can reach the micron level (0.5 - 100μm), which can effectively remove fine impurities in titanium dioxide and ensure the purity of the product. Utilizing the high strength and wear resistance of the silicon carbide filter element 105 can prevent the filter element from being damaged due to material wear, thus avoiding the phenomenon of filter breakthrough and ensuring the filtration effect.

[0042] A filtrate outlet 101, which is arranged on the filtration and washing device 1 and is used to discharge the filtered liquid;

[0043] Specifically, the main functions of the filtrate outlet 101 include:

[0044] Discharging the filtrate. During the solid-liquid separation process, the filtrate outlet 101 discharges the filtered liquid from the system to ensure that the filtered liquid does not mix with the solid titanium dioxide.

[0045] Recycling. The discharged filtrate can be recycled after further treatment.

[0046] Improving purity. By discharging the filtrate, soluble impurities in the titanium dioxide can be effectively removed, improving the purity of the product.

[0047] The backflush device 2 is connected to the filtration and washing device 1 through a pipeline and is used for backflushing the filter element 105;

[0048] Specifically, the backflush device 2 has the following functions:

[0049] Restoring the flux of the filter element 105. During the filtration process, impurities will gradually accumulate on the surface of the filter element 105, resulting in a decrease in filtration efficiency. The backflush device 2 flushes away the impurities on the surface of the filter element 105 through backflushing, restoring the flux of the filter element 105.

[0050] Prolonging the service life of the filter element 105. The backflush process can effectively remove the blockages on the surface of the filter element 105, reduce the wear of the filter element 105, and thus prolong the service life of the filter element 105.

[0051] Reducing manual intervention. The automated design of the backflush device 2 reduces the need for manual cleaning of the filter element 105 and reduces the labor intensity. At the same time, the liquid used during the backflush process can be treated filtrate or recycled water, further saving fresh water resources.

[0052] The damper 3 is connected to the backflush device 2 and is used for adjusting the backflush pressure.

[0053] Specifically, the damper 3 includes the following functions:

[0054] Stabilizing the backflush pressure. During the backflush process, the damper 3 can adjust the pressure of the backflush liquid to ensure the stability and uniformity of the backflush process.

[0055] Protecting the filter element 105. By adjusting the backflush pressure, the damper 3 can prevent damage to the filter element 105 caused by excessive pressure, thus prolonging the service life of the filter element 105.

[0056] Optimizing the backflush effect. An appropriate backflush pressure can more effectively remove the impurities on the surface of the filter element 105 and improve the backflush efficiency.

[0057] The negative pressure pump 4 is connected to the filtration and washing device 1 and is used for providing a negative pressure environment during the filtration process to improve the filtration efficiency;

[0058] The feed water pump 5 is connected to the filtration and washing device 1 and is used to convey water for washing to the filtration and washing device 1.

[0059] The electric control valve 6 is arranged on the water inlet pipeline of the feed water pump 5 and is used to adjust the water inlet flow rate. The working temperature of the filtration and washing device 1 is 50 °C, the design pressure is 1 MPa, and the volume can be adjusted according to the material volume to adapt to production requirements of different scales. The system also includes a regular cleaning device for periodically cleaning the filtration and washing device 1. The filter element 105 has a multi-layer structure, including a silicon carbide filtration layer and a support layer arranged on the outer side thereof, and the support layer is used to prevent the filter element 105 from deforming during the filtration process.

[0060] Specifically, the water flow rate entering the filtration and washing device 1 is adjusted by the electric control valve 6 to ensure an appropriate water volume and avoid waste. The water is filtered through the multi-layer filter element 105 to remove impurities therein, so as to achieve the purpose of washing titanium dioxide. As the usage time goes by, a certain amount of impurities will accumulate on the filter element 105. The regular cleaning device will be automatically started to remove the impurities on the filter element 105 and ensure the continuous and efficient operation of the system.

[0061] Its advantages are as follows:

[0062] Water saving: The design of this system focuses on water saving. Through effective water flow regulation and filtration process, unnecessary water resource waste is avoided.

[0063] Efficient cleaning: The regular cleaning device ensures that during the long-term operation of the system, the washing effect will not be affected due to the blockage of the filter element 105.

[0064] Adjustability: The volume of the system can be adjusted according to different production requirements, with strong adaptability, and can support production of different scales.

[0065] The filtration and washing device 1 further includes a liquid level sensor arranged inside it, which is used to monitor the liquid level height inside the device in real time and transmit the signal to the control system. Automatic control valves are provided at both the feed inlet 102 and the filtrate outlet 101, and the automatic control valves are connected to the control system and are used to control the inlet and outlet of materials and filtrate.

[0066] Specifically, the liquid level sensor is installed inside the filtration and washing device 1 and is mainly used to monitor the height of the liquid inside the device in real time. During the actual operation process, the change of the liquid level will affect the washing effect or the safe operation of the device, so accurate monitoring is required. When the liquid level reaches the preset upper limit or lower limit, the liquid level sensor will send out a signal to transmit the liquid level information to the control system. The control system makes corresponding responses and adjustments according to these data. By monitoring the liquid level in real time, the liquid flow rate of the system is efficiently regulated to prevent too much or too little liquid from flowing in and keep the device in the best operating state.

[0067] The feed inlet 102 is the inlet for inputting the liquid to be processed in the filtration and washing device. The function of the feed inlet 102 is to introduce the liquid that needs to be filtered and washed into the device.

[0068] The filtrate outlet 101 is the outlet through which the filtered liquid flows out. During the washing process, part of the liquid will be processed, and the purified liquid is discharged through the filtrate outlet 101.

[0069] The automatic control valve is an automated valve that can be opened or closed according to the instructions of the control system. The role of the automatic control valve is to regulate the flow of liquid between these two ports. The control system automatically controls the opening and closing of the valve based on the data from the liquid level sensor, thereby regulating the inflow and outflow of the liquid.

[0070] Through the cooperation of liquid level monitoring and automatic control valves, this system can achieve precise control of the liquid flow rate and reduce unnecessary water resource waste. By intelligently adjusting the liquid level, the system avoids overusing water and achieves the purpose of water conservation.

[0071] The backflusher 2 includes a backflush pump and a connected backflush pipeline. The backflush pipeline extends into the interior of the filter element 105 for directly transporting the backflush liquid into the interior of the filter element 105 for reverse flushing. A discharge port is provided at the bottom of the filtration and washing device 1. A discharge valve is provided at the discharge port, and the discharge valve is connected to the control system for controlling the discharge of the filtered solid material.

[0072] The system also includes a compressed air device. The compressed air device is connected to the filtration and washing device 1 through a pipeline for purging the filter element 105 after the water discharge is completed to discharge the residual liquid.

[0073] Specifically, utilizing the high-pressure characteristics of compressed air, the compressed air is transported into the interior of the filter element 105 through a pipeline. When the compressed air passes through the filter element 105, it will blow out the residual liquid inside the filter element 105, thereby ensuring that the filter element 105 is in a dry state before the next use. This design not only extends the service life of the filter element 105 but also further saves water resources because the purged liquid can be collected and reused for industrial water. In addition, the use of the compressed air device also reduces the problem of blockage of the filter element 105 caused by liquid residue and improves the filtration efficiency.

[0074] Working principle: Using this device specifically includes the following steps:

[0075] Step 1: The material enters the interior of the filtration and washing device 1 through the feed inlet 102. When the material enters the device, at this time, the motor 103 starts, and the stirring blade 104 connected to its driving end begins to rotate, enabling the material to come into full contact with water to ensure uniform mixing, providing good conditions for subsequent filtration and water washing;

[0076] Step 2: The uniformly stirred material enters the filtration process. By using a silicon carbide filter element 105, its high filtration accuracy can effectively separate titanium dioxide materials with smaller particle sizes. When the material passes through the filter element 105, solid particles are intercepted on the surface of the filter element 105, while the liquid passes through the filter element 105 into the device and finally is discharged from the device through the filtrate port 101;

[0077] Step 3: After filtration is completed, the system enters the water washing stage. The water inlet pump 5 conveys water for washing through a pipeline to the filtration and washing device 1. During the water washing process, the stirring blade 104 continues to work to ensure that water and solid particles are in full contact, further removing soluble impurities and improving the purity of titanium dioxide;

[0078] Step 4: After water washing is completed, the system enters the backwashing stage to restore the flux of the filter element 105. The backwasher 2 is connected to the filtration and washing device 1 through a pipeline. The backwash pump conveys the backwash liquid into the interior of the filter element 105, and impurities on the surface of the filter element 105 are removed through reverse flushing. After backwashing is completed, the compressed air device conveys compressed air into the device through a pipeline to blow the filter element 105 and discharge the residual liquid, further extending the service life of the filter element 105 and saving water resources;

[0079] Step 5: After backwashing and regeneration are completed, the system enters the discharging stage. Open the discharging valve, and the filtered solid material is discharged from the device and enters the subsequent drying or packaging process.

[0080] The following Table 1 shows the comparison of the operation data of this system and traditional filter presses in actual production:

[0081]

[0082] Table 1

[0083] As can be seen from Table 1: This system adopts a silicon carbide filter element and negative pressure filtration technology, and the filtration efficiency is significantly improved. It takes 5 hours for a traditional filter press to complete the treatment of a batch of materials, while this system only takes 1.5 hours, and the production efficiency is increased by about 2.3 times.

[0084] The water-saving effect is remarkable: The traditional filter press consumes 10 cubic meters of water per ton of materials, while this system, through optimizing the water washing process and recycling technology, only consumes 5 cubic meters of water per ton of materials, and the water-saving rate is as high as 50%.

[0085] Automation and environmental protection: This system adopts fully automated operation without manual intervention, reducing labor intensity and the risk of environmental pollution. At the same time, the closed design effectively prevents material leakage and reduces the need for anti-corrosion treatment in the workplace.

[0086] Filter element regeneration and life: The system uses compressed air backwashing technology to regenerate the filter element, which not only quickly restores the flux of the filter element but also extends the service life of the filter element and reduces the equipment maintenance cost.

[0087] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-saving titanium dioxide filtering and washing system, characterized in that: include: A filtering and washing device (1) is used for solid-liquid separation and water washing in the process section before metatitanic acid hydrolysis and after coating in the titanium dioxide production process; A feed inlet (102), arranged on one side of the top of the filtering and washing device (1), for introducing materials into the device; A motor (103) is arranged at the top of the filtering and washing device (1), and a stirring blade (104) is installed at the driving end of the motor (103). The stirring blade (104) rotates to allow the material to fully contact with the water; A filter element (105), arranged in the filtering and washing device (1), made of silicon carbide material, and used for filtering a solid-liquid mixture; A filtrate outlet (101), arranged on the filtering and washing device (1), for discharging the filtered liquid; A recoiler (2), connected to the filter washing device (1) via a pipeline, and used for backwashing the filter element (105); The damper (3) is connected to the recoil device (2) and is used to adjust the recoil pressure.

2. A water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: Also includes: A negative pressure pump (4) is connected to the filtering and washing device (1) and is used to provide a negative pressure environment during the filtering process to improve the filtering efficiency; a water inlet pump (5), connected to the filter and washing device (1), and used for delivering washing water to the filter and washing device (1); The electric regulating valve (6) is arranged on the water inlet pipeline of the water inlet pump (5) and is used to adjust the water inlet flow rate.

3. A water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: The working temperature of the filtering and washing device (1) is 50-65°C, the design pressure is 1-5MPa, and the volume can be adjusted according to the volume of the material to meet the production needs of different scales.

4. The water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: The system also includes a periodic cleaning device for periodically cleaning the filtering and washing device (1).

5. The water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: The filter element (105) is a multi-layer structure, comprising a silicon carbide filter layer and a support layer arranged on the outside thereof, wherein the support layer is used to prevent the filter element (105) from deforming during the filtering process.

6. The water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: The filtering and washing device (1) further comprises a liquid level sensor arranged inside the device, which is used for real-time monitoring of the liquid level height in the device and transmitting the signal to the control system.

7. The water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: The feed port (102) and the filtrate port (101) are both provided with automatic control valves, and the automatic control valves are connected to a control system for controlling the inflow and outflow of materials and filtrate.

8. The water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: The recoiler (2) comprises a recoil pump and a recoil pipeline connected thereto, wherein the recoil pipeline extends to the interior of the filter element (105) and is used to directly transport the recoil liquid to the interior of the filter element (105) for backwashing.

9. The water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: The bottom of the filtering and washing device (1) is provided with a discharge port, and the discharge port is provided with a discharge valve. The discharge valve is connected to a control system and is used to control the discharge of filtered solid materials.

10. The water-saving titanium dioxide filtering and washing system according to claim 1, characterized in that: The system further comprises a compressed air device, which is connected to the filter washing device (1) via a pipeline and is used to purge the filter element (105) and discharge residual liquid after the water is drained.

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