An apparatus and method for a dissolving and scavenging process

Abstract

This invention relates to equipment and methods for a dissolution and impurity removal process, belonging to the technical field of filtration equipment and methods. The technical solution of this invention is as follows: a pneumatic control component is installed in the feed pipe, discharge pipe, backwash / backflush pipe, and sewage discharge pipe connected to the main filter cylinder; a filter element assembly is installed inside the main filter cylinder; a pressure detection component is installed on the side wall of the main filter cylinder; an auxiliary observation component is installed in the feed pipe, discharge pipe, and backwash / backflush pipe; the pneumatic control component and the pressure detection component are electrically connected to a PLC automatic control system. The beneficial effects of this invention are: it can effectively trap micron-sized fine particles in the alkaline impurity removal sludge solution, reducing the interference of impurities on subsequent crystallization and reduction processes from the source, ensuring that the purity indicators of aerospace vanadium flakes consistently meet standards, and exhibiting strong process adaptability.

Description

Technical Field

[0001] This invention relates to an apparatus and method for a dissolution and impurity removal process, belonging to the technical field of filtration equipment and methods. Background Technology

[0002] As a high-end vanadium material, aerospace vanadium flakes have extremely high requirements for the precision of each process in their production. The dissolution and impurity removal process is one of the core links in the production of aerospace vanadium flakes. This process will produce an alkaline impurity removal mud solution containing solid impurities. If efficient and high-precision solid-liquid separation cannot be achieved, the impurities in the filtrate will directly affect the product quality of subsequent purification, crystallization and other processes, ultimately reducing the purity and performance of the finished aerospace vanadium flakes.

[0003] Currently, in the dissolution and impurity removal process of the vanadium production industry, traditional filtration equipment mostly uses ordinary filter screens, ceramic filter elements, and other filter elements. These have problems such as low filtration accuracy (generally greater than 10 microns) and easy residue of visible impurities in the filtrate, which cannot meet the high precision requirements of aerospace vanadium production. Some filter elements of the equipment are non-maintainable online and need to be disassembled and cleaned after a period of use, which seriously affects the continuity of production and reduces the overall production efficiency. At the same time, traditional equipment has a low degree of automation and relies heavily on manual operation to control pipeline opening and closing and monitor operating conditions. This is not only labor-intensive, but also prone to problems such as equipment overpressure operation and unstable filtration effect due to human operation errors.

[0004] In addition, the impurity removal sludge solution produced by aerospace vanadium sheet is an alkaline medium, and the operating temperature fluctuates between 0-90℃. The materials in contact with the material of traditional filtration equipment have poor resistance to alkaline corrosion, and the temperature and alkali resistance of the seals are not suitable, which can easily lead to equipment corrosion, seal leakage and other failures, shortening the service life of the equipment. Existing equipment also lacks a complete operating condition monitoring system, which cannot keep track of the equipment operating pressure in real time, and there are certain safety hazards.

[0005] In response to the specific working conditions and high-precision, highly automated production requirements of the dissolution and impurity removal process in the production of aerospace vanadium flakes, there is an urgent need to develop a precision filter that is compatible with alkaline solutions, has high filtration accuracy, can be maintained online, has a high degree of automation, and is safe to operate. This would address the technical deficiencies of existing equipment, improve the filtration efficiency and filtrate quality of the dissolution and impurity removal process in the production of aerospace vanadium flakes, and ensure the quality of the finished aerospace vanadium flakes. Summary of the Invention

[0006] The purpose of this invention is to provide an equipment and method for a dissolution and impurity removal process. By employing a high-precision sintered ceramic filter tube and online particle size monitoring for dual protection, it can effectively trap micron-sized fine particles in alkaline impurity removal sludge solution, significantly improving the clarity of the filtrate. It reduces the interference of impurities on subsequent crystallization and reduction processes from the source, ensuring that the purity indicators of aerospace vanadium flakes consistently meet standards, and eliminating the risk of batch rejection due to excessive impurities. It has strong process adaptability, breaking through traditional filtration bottlenecks. Addressing the alkaline and high-viscosity media characteristics of the aerospace vanadium flake dissolution and impurity removal process, it solves the pain points of traditional filtration equipment such as easy clogging, unstable filtration accuracy, and high consumable consumption through the selection of corrosion-resistant materials and precise control of the ABB frequency conversion control system. It achieves stable, accurate, and precise solid-liquid separation under complex working conditions, effectively solving the aforementioned problems existing in the background technology.

[0007] The technical solution of this invention is: a device for a dissolving and removing impurities process, comprising a main filter cylinder, a filter element assembly, a pneumatic control assembly, a PLC automatic control system, a pressure detection component, an auxiliary observation component, and a sealing and protective component. The main filter cylinder is a vertical hollow structure with a hanging foot support installation structure. The main filter cylinder has a feed inlet, a discharge outlet, a backwash outlet, a backflush outlet, a vent / pressure outlet, a forward air outlet, a drain outlet, and a circulation outlet. The pneumatic control assembly is installed in the feed pipeline, discharge pipeline, backwash / backflush pipeline, and drain pipeline connected to the main filter cylinder. The filter element assembly is installed inside the main filter cylinder, and the pressure detection component is installed on the side wall of the main filter cylinder. The auxiliary observation component is installed in the feed pipeline, discharge pipeline, and backwash / backflush pipeline. The sealing and protective component is adapted to each connection part. The pneumatic control assembly and the pressure detection component are electrically connected to the PLC automatic control system.

[0008] The feed inlet, discharge outlet, and drain outlet are all flange connection structures. The part of the main filter cylinder that comes into contact with the material is made of S30408 ​​stainless steel. The outer surface of the main filter cylinder has a matte finish, and the inner surface has a white finish.

[0009] The filter element assembly is a PA high molecular weight polyethylene sintered filter element with a filtration accuracy of ≤5 microns and an online backwashing and backflushing structure.

[0010] The pneumatic control component includes pneumatic valves and solenoid valves. The pneumatic valves are respectively installed on the feed pipe, discharge pipe, backwash and backflush pipe and sewage discharge pipe connected to the main filter cylinder. The solenoid valves are matched and linked with the pneumatic valves to realize the automatic switching of the pipelines.

[0011] The pressure detection component is a pressure transmitter, and the equipment's operating pressure is controlled between 0.1 and 0.5 MPa.

[0012] The auxiliary observation component includes three sight glasses, which are made of alkali-resistant glass.

[0013] The sealing and protective components include fluororubber seals and spare cylindrical sealing rings made of fluororubber. The fluororubber seals are adapted to the connection parts of various flanges, filter elements and sight glasses.

[0014] A method for a dissolution and impurity removal process includes the following steps: Step 1, filtration stage: The alkaline impurity removal sludge solution produced from aerospace vanadium sheets is introduced into the feed inlet through a pipeline. The PLC automatic control system sends a signal to the pneumatic control component, opening the solenoid valves of the feed and discharge pipelines, and closing the solenoid valves of the backwash and backflush pipelines and the drain pipeline. After the alkaline impurity removal sludge solution enters the main filter cylinder, it flows through the filter element assembly. Solid impurities are trapped by the filter element, and the clarified filtrate is discharged through the discharge port to enter the subsequent production process. During this stage, the equipment working pressure is controlled at 0.1-0.5 MPa. The pressure transmitter transmits the pressure signal to the PLC automatic control system in real time, and the flow status and clarity of the filtrate are observed through the sight glass. Step 2, Online Backwashing and Backflushing Stage: When the equipment has been filtering continuously for a certain period of time or the pressure inside the main filter cylinder reaches the threshold set by the PLC automatic control system, it enters the online backwashing and backflushing stage. The PLC automatic control system sends a signal to the pneumatic control component, the solenoid valves of the feed pipeline and the discharge pipeline close, and the backwashing and backflushing pipeline and the sewage discharge pipeline open. The external backwashing medium enters the main filter cylinder through the backwash port and the backflushing port to backwash and backflush the filter element assembly, flushing the solid impurities trapped on the surface of the filter element to the bottom of the main filter cylinder. This stage does not require machine shutdown. After the backwashing and backflushing is completed, the equipment switches back to the filtration stage. Step 3, the sludge and wastewater discharge stage: When solid impurities accumulate to a certain level at the bottom of the main filter cylinder, the sludge and wastewater discharge program is initiated through the PLC automatic control system. The PLC automatic control system sends a signal to the pneumatic control component, and the solenoid valve of the sludge discharge pipeline opens. The concentrated slurry of impurities in the cylinder is quickly discharged through the sludge discharge port. After the wastewater discharge is completed, the solenoid valve of the sludge discharge pipeline closes, and the equipment continues to operate in the filtration stage.

[0015] The PLC automatic control system is a non-explosion-proof PLC control cabinet with an AC input voltage of 220V, an input current of 5A, and a power supply line cross-sectional area ≥2.5mm². The PLC control cabinet is electrically connected to the pneumatic control components and pressure detection components. Before installation, the cable wiring with the pneumatic valves and solenoid valves is completed to realize one-button start-up and full-process automated control of the equipment.

[0016] The working medium of the equipment is an alkaline impurity removal sludge solution from the dissolution and impurity removal process in the production of aerospace vanadium sheets. The working temperature is 0-90℃, and the slag discharge method is concentrated slurry discharge.

[0017] The beneficial effects of this invention are as follows: By employing high-precision sintered ceramic filter tubes and online particle size monitoring for dual protection, it can effectively trap micron-sized fine particles in alkaline impurity removal sludge solution, significantly improving the clarity of the filtrate; it reduces the interference of impurities on subsequent crystallization and reduction processes from the source, ensuring that the purity indicators of aerospace vanadium flakes consistently meet standards, and eliminating the risk of batch scrapping due to excessive impurities; it has strong process adaptability, breaking through the bottleneck of traditional filtration. Targeting the alkaline and high-viscosity media characteristics of the aerospace vanadium flake dissolution and impurity removal process, through the selection of corrosion-resistant materials and the precise control of the ABB frequency conversion control system, it solves the pain points of traditional filtration equipment such as easy clogging, unstable filtration accuracy, and high consumable consumption, achieving "stable, accurate, and precise" solid-liquid separation under complex working conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a diagram showing the orientation of the inlet of the main filter cylinder of the present invention; Figure 3 This is a schematic diagram of the filter element assembly of the present invention; Figure 4 This is a schematic diagram of the filter element assembly fixing method of the present invention; In the diagram: 1. Inlet; 2. Outlet; 3. Backwash port; 4. Backflush port; 5. Vent / Pressure port; 6. Forward airflow port; 7. Drain port; 8. Circulation port; 9. Bolt. Detailed Implementation

[0019] To make the purpose, technical solutions, and advantages of the invention's embodiments clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only a small part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0020] A device for a dissolving and impurity removal process includes a main filter cylinder, a filter element assembly, a pneumatic control assembly, a PLC automatic control system, a pressure detection component, an auxiliary observation component, and a sealing and protective component. The main filter cylinder is a vertical hollow structure with a hanging foot support installation structure. The main filter cylinder has an inlet 1, an outlet 2, a backwash port 3, a backflush port 4, a vent / pressure port 5, a forward blow port 6, a drain port 7, and a circulation port 8. The pneumatic control assembly is installed in the inlet pipeline, outlet pipeline, backwash / backflush pipeline, and drain pipeline connected to the main filter cylinder. The filter element assembly is installed inside the main filter cylinder, and the pressure detection component is installed on the side wall of the main filter cylinder. The auxiliary observation component is installed in the inlet pipeline, outlet pipeline, and backwash / backflush pipeline. The sealing and protective component is adapted to each connection part. The pneumatic control assembly and the pressure detection component are electrically connected to the PLC automatic control system.

[0021] The feed inlet 1, the discharge outlet 2, and the drain outlet 7 are all flange connection structures. The part of the main filter cylinder that comes into contact with the material is made of S30408 ​​stainless steel. The outer surface of the main filter cylinder has a matte finish, and the inner surface has a white finish.

[0022] The filter element assembly is a PA high molecular weight polyethylene sintered filter element with a filtration accuracy of ≤5 microns and an online backwashing and backflushing structure.

[0023] The pneumatic control component includes pneumatic valves and solenoid valves. The pneumatic valves are respectively installed on the feed pipe, discharge pipe, backwash and backflush pipe and sewage discharge pipe connected to the main filter cylinder. The solenoid valves are matched and linked with the pneumatic valves to realize the automatic switching of the pipelines.

[0024] The pressure detection component is a pressure transmitter, and the equipment's operating pressure is controlled between 0.1 and 0.5 MPa.

[0025] The auxiliary observation component includes three sight glasses, which are made of alkali-resistant glass.

[0026] The sealing and protective components include fluororubber seals and spare cylindrical sealing rings made of fluororubber. The fluororubber seals are adapted to the connection parts of various flanges, filter elements and sight glasses.

[0027] A method for a dissolution and impurity removal process includes the following steps: Step 1, filtration stage: The alkaline impurity removal sludge solution produced from aerospace vanadium sheets is introduced into the feed inlet through a pipeline. The PLC automatic control system sends a signal to the pneumatic control component, opening the solenoid valves of the feed and discharge pipelines, and closing the solenoid valves of the backwash and backflush pipelines and the drain pipeline. After the alkaline impurity removal sludge solution enters the main filter cylinder, it flows through the filter element assembly. Solid impurities are trapped by the filter element, and the clarified filtrate is discharged through the discharge port to enter the subsequent production process. During this stage, the equipment working pressure is controlled at 0.1-0.5 MPa. The pressure transmitter transmits the pressure signal to the PLC automatic control system in real time, and the flow status and clarity of the filtrate are observed through the sight glass. Step 2, Online Backwashing and Backflushing Stage: When the equipment has been filtering continuously for a certain period of time or the pressure inside the main filter cylinder reaches the threshold set by the PLC automatic control system, it enters the online backwashing and backflushing stage. The PLC automatic control system sends a signal to the pneumatic control component, the solenoid valves of the feed pipeline and the discharge pipeline close, and the backwashing and backflushing pipeline and the sewage discharge pipeline open. The external backwashing medium enters the main filter cylinder through the backwash port and the backflushing port to backwash and backflush the filter element assembly, flushing the solid impurities trapped on the surface of the filter element to the bottom of the main filter cylinder. This stage does not require machine shutdown. After the backwashing and backflushing is completed, the equipment switches back to the filtration stage. Step 3, the sludge and wastewater discharge stage: When solid impurities accumulate to a certain level at the bottom of the main filter cylinder, the sludge and wastewater discharge program is initiated through the PLC automatic control system. The PLC automatic control system sends a signal to the pneumatic control component, and the solenoid valve of the sludge discharge pipeline opens. The concentrated slurry of impurities in the cylinder is quickly discharged through the sludge discharge port. After the wastewater discharge is completed, the solenoid valve of the sludge discharge pipeline closes, and the equipment continues to operate in the filtration stage.

[0028] The PLC automatic control system is a non-explosion-proof PLC control cabinet with an AC input voltage of 220V, an input current of 5A, and a power supply line cross-sectional area ≥2.5mm². The PLC control cabinet is electrically connected to the pneumatic control components and pressure detection components. Before installation, the cable wiring with the pneumatic valves and solenoid valves is completed to realize one-button start-up and full-process automated control of the equipment.

[0029] The working medium of the equipment is an alkaline impurity removal sludge solution from the dissolution and impurity removal process in the production of aerospace vanadium sheets. The working temperature is 0-90℃, and the slag discharge method is concentrated slurry discharge.

[0030] In practical applications, the present invention includes a main filter cylinder, a filter element assembly, a pneumatic control assembly, a PLC automatic control system, a pressure detection component, an auxiliary observation component, and a sealing and protection component. The components work together to achieve efficient solid-liquid separation of the impurity removal sludge solution in the production of aerospace vanadium sheets. The equipment is adaptable to alkaline conditions, has a high degree of automation, and operates safely and stably, meeting the needs of continuous industrial production.

[0031] The main filter cylinder is a vertical hollow structure, serving as the core load-bearing structure and filtration chamber of the equipment. It adopts a hanging foot support method, facilitating the installation, fixation, and leveling of the equipment on the industrial site. The top of the cylinder is equipped with a feed inlet, backwash inlet, and backflush inlet, while the bottom is equipped with a discharge outlet and a drain outlet. The feed inlet, discharge outlet, and drain outlet are all equipped with flanges to accommodate standardized connections for industrial pipelines. The cylinder discharges slag by discharging concentrated slurry, which can quickly discharge the concentrated slurry of solid impurities trapped by filtration, preventing impurities from accumulating inside the cylinder.

[0032] The inner surface of the main filter cylinder that comes into contact with the material, as well as all flanges and interface components, are made of S30408 ​​stainless steel. This material has excellent resistance to alkaline corrosion and mechanical strength, making it suitable for alkaline impurity removal sludge solutions used in the production of aerospace vanadium sheets, and it can withstand operating temperature fluctuations of 0-90℃. The outer surface of the cylinder is matte-finished, while the inner surface is white-painted to improve the cylinder's dirt resistance, corrosion resistance, and appearance durability, while reducing material adsorption and cylinder oxidation.

[0033] The filter element assembly is the core filtration element of the equipment, installed inside the main filter cylinder. It uses a sintered PA high-molecular-weight polyethylene filter element, which has a sintered microporous structure with a filtration accuracy of ≤5 microns. It can efficiently intercept solid impurities in alkaline sludge solutions, achieving a filtration effect where the filtrate is clear and free of visible impurities. The filter element is fixed by a nut (material: PE).

[0034] The filter element assembly adopts an online backwashing and backflushing installation structure, which is connected to the backwash port and backflushing port of the cylinder. The filter element can be cleaned and regenerated without stopping the machine to disassemble, effectively ensuring the continuous operation of the equipment and avoiding production interruptions caused by filter element maintenance.

[0035] The pneumatic control components include pneumatic valves and solenoid valves. The pneumatic valves are installed on the feed pipe, discharge pipe, backwash and backflush pipe, sewage discharge pipe and auxiliary pipe of the main filter cylinder according to the specifications of the pipeline used. The solenoid valves are linked with the pneumatic valves to provide on / off control signals to the pneumatic valves, realize the automatic on / off switching of each pipeline, replace the traditional manual operation and improve the automation level of the equipment.

[0036] The pneumatic control components are supplied with an external industrial air source, which is compatible with the air supply standards of the industrial site. The valves are sensitive and have good sealing performance. They can adapt to the alkaline conditions and temperature fluctuations of the equipment, ensuring the stability of pipeline control.

[0037] The PLC automatic control system is based on a Siemens non-explosion-proof PLC control cabinet. The AC input voltage is 220V, the input current is 5A, and the cross-sectional area of ​​the power supply line must be ≥2.5mm² to adapt to the power supply standards of industrial sites. The control cabinet integrates the main control module, wiring module, control buttons and display module. Externally, it is equipped with one-button start, emergency stop, manual / automatic switching and other operation buttons for easy operation by operators.

[0038] The PLC control cabinet is electrically connected to the pneumatic control components and pressure detection components via cables. The cable installation and wiring between the control cabinet and the pneumatic valves and solenoid valves have been completed before leaving the factory. It can be put into use on site with only an external power supply, reducing the amount of on-site installation work. The PLC automatic control system can realize one-button start of equipment, automatic filtration, online backwashing and backflushing, sewage and slag discharge and other full-process control. At the same time, it receives signals from the pressure detection components to realize real-time monitoring and feedback of operating data.

[0039] The pressure detection component is a pressure transmitter, which is fixedly installed on the upper side wall of the main filter cylinder and electrically connected to the PLC automatic control system. The pressure transmitter can detect the working pressure inside the main filter cylinder in real time, convert the pressure signal into an electrical signal and transmit it to the PLC control cabinet to realize real-time monitoring of the equipment operating pressure. The normal operating pressure of the equipment is controlled between 0.1-0.5MPa. When the pressure exceeds the set range, the control cabinet can issue an early warning to prevent the equipment from operating under overpressure and improve the safety of equipment operation.

[0040] The auxiliary observation components are sight glasses, which are installed at key locations in the feed pipeline, discharge pipeline, and backwash / backflush pipeline. The sight glasses are made of high-strength alkali-resistant glass with good sealing performance. Operators can directly observe the flow status of the alkaline solution in the pipeline, the clarity of the filtrate, and the backwash / backflush effect through the sight glasses, realizing visual monitoring of the equipment's operating conditions and facilitating the timely detection of problems such as pipeline blockage and filter element failure.

[0041] The sealing and protective components include fluororubber seals and spare cylinder sealing rings. The fluororubber seals are compatible with the flange connections, filter element mounting points, sight glass mounting points, and various pipeline connections of the main filter cylinder. Fluororubber has excellent alkali resistance, temperature resistance (-20℃-200℃), and sealing performance, which can effectively prevent the leakage of alkaline solutions and adapt to the fluctuations in the operating temperature of the equipment. The spare cylinder sealing ring is made of fluororubber and is used as a vulnerable part of the equipment, which facilitates the later maintenance and replacement of the equipment and ensures the long-term stability of the equipment's sealing performance.

[0042] Furthermore, the working medium of the precision filter described in this invention is an alkaline impurity removal sludge solution from the dissolution and impurity removal process in the production of aerospace vanadium flakes. The working temperature range is 0-90℃. After filtration, the filtrate is clear and free of impurities visible to the naked eye, which is fully adapted to the industrial processing requirements of aerospace vanadium flake production.

[0043] Furthermore, the online backwashing and backflushing process of the filter element assembly of the precision filter described in this invention is automatically controlled by a PLC automatic control system. When the pressure inside the cylinder reaches the set threshold or the filtration time reaches the set value, the PLC control cabinet automatically switches the pneumatic valve and starts the backwashing and backflushing program. After the filter element cleaning is completed, the filtration state is automatically restored, and no manual intervention is required throughout the process. Example

[0044] This embodiment is applied to the dissolution and impurity removal process of the aerospace vanadium flake project production system of Chengde Vanadium Titanium New Materials Co., Ltd., and is used for solid-liquid separation and filtration of alkaline impurity removal mud solution. The equipment consists of a main filter cylinder, filter element assembly, pneumatic control assembly, PLC automatic control system, pressure detection component, auxiliary observation component and sealing and protection component. The specifications and installation method of each component are strictly configured in accordance with the technical solution of this invention.

[0045] 1) Equipment Working Process: In this embodiment, the entire working process is controlled by a PLC automatic control system, specifically divided into a filtration stage, an online backwashing and backflushing stage, and a sludge and wastewater discharge stage. Each stage is seamlessly connected, achieving continuous production. 2) Filtration Stage: The alkaline impurity removal sludge solution from the production of vanadium foil is introduced into the equipment inlet through industrial pipeline. The operator presses the one-button start button on the PLC control cabinet, and the equipment enters the automatic filtration mode. The PLC control cabinet sends a signal to the pneumatic control component, opening the solenoid valves of the feed and discharge pipelines, and closing the solenoid valves of the backwash and backflush pipelines and the sewage discharge pipeline. After the alkaline impurity removal sludge solution enters the main filter cylinder, it flows through the filter element assembly. Solid impurities are intercepted by the filter element, and the clarified filtrate is discharged through the outlet and enters the subsequent production process. During this stage, the equipment working pressure is controlled at 0.1-0.5 MPa. The pressure transmitter transmits the pressure signal to the PLC control cabinet in real time, and the operator can observe the filtrate flow status and clarity through the sight glass.

[0046] 3) Online backwashing and backflushing stage: When the equipment filters continuously for a certain period of time or the pressure inside the main filter cylinder reaches the threshold set by the PLC control cabinet, the equipment automatically enters the online backwashing and backflushing stage; the PLC control cabinet sends a signal to the pneumatic control component, the solenoid valves of the feed pipeline and the discharge pipeline close, and the solenoid valves of the backwashing and backflushing pipeline and the sewage discharge pipeline open; the external backwashing medium enters the cylinder through the backwashing and backflushing interface to backwash and backflushing the filter element assembly, and flushes the solid impurities trapped on the surface of the filter element to the bottom of the cylinder. This stage does not require stopping the machine. After the backwashing and backflushing is completed, the equipment automatically switches back to the filtration stage.

[0047] 4) Sewage and slag discharge stage: When solid impurities accumulate to a certain level at the bottom of the cylinder, the operator can start the sewage and slag discharge program through the PLC control cabinet (or the equipment will start automatically). The PLC control cabinet sends a signal to the pneumatic control component, and the solenoid valve of the sewage discharge pipeline opens automatically. The impurity slurry in the cylinder is quickly discharged through the sewage discharge port. After the slag discharge is completed, the solenoid valve of the sewage discharge pipeline closes automatically, and the equipment continues to operate in the filtration stage.

[0048] The precision filter described in the above embodiments has achieved excellent industrial application results after being put into use in the dissolution and impurity removal process of aerospace vanadium flake production: the filtration accuracy is ≤5 microns, the filtrate after filtration is clear and free of visible impurities, fully meeting the high-precision process requirements of aerospace vanadium flake production, and the purity of products in subsequent processes is improved by about 15% compared with traditional filtration equipment; the equipment can achieve 24-hour continuous operation, and the filter element can be backwashed and backflushed online without stopping the machine, improving production efficiency by more than 60% compared with traditional equipment; the equipment has a high degree of automation, requiring only one operator to complete daily operating condition monitoring, greatly reducing labor intensity; the equipment is suitable for alkaline conditions, and has not experienced corrosion or sealing leaks after 6 months of continuous operation, and pressure monitoring and sight glass observation can promptly detect potential faults, ensuring safe and stable operation of the equipment; the equipment requires minimal on-site installation work, is convenient for later maintenance, and easy to replace vulnerable parts, fully meeting the industrial needs of aerospace vanadium flake production.

[0049] This invention is designed specifically for the operating conditions and process requirements of the dissolution and impurity removal process in the production of aerospace-grade vanadium sheets, and compared with existing technologies, it has the following significant advantages: 1. High filtration accuracy and excellent filtrate quality: The filter element is made of PA high molecular weight polyethylene sintered material with a filtration accuracy of ≤5 microns. It can efficiently remove solid impurities in alkaline sludge solution. The filtrate after filtration is clear and free of impurities visible to the naked eye, which meets the high precision requirements of aerospace vanadium sheet production and effectively ensures the product quality of subsequent processes.

[0050] 2. Suitable for alkaline conditions and long service life: The main filter cylinder and the parts in contact with the material are made of S30408 ​​stainless steel, and the sealing parts are made of fluororubber. Both have excellent resistance to alkaline corrosion and temperature resistance, and can adapt to working temperature fluctuations of 0-90℃. This effectively solves the problems of easy corrosion and leakage of traditional equipment and greatly improves the service life of the equipment.

[0051] 3. High degree of automation and reduced labor intensity: The integrated PLC automatic control system and pneumatic control components enable one-button start-up of the equipment, fully automated filtration, online backwashing and backflushing, and sewage and slag discharge. No manual operation of pipeline opening and closing is required. Only one operator is needed to complete daily operation monitoring, which greatly reduces the labor intensity of operators and avoids equipment failure caused by human operation errors.

[0052] 4. Online maintenance and continuous production: The filter element assembly adopts an online backwashing and backflushing structure, which can complete the cleaning and regeneration of the filter element without stopping the machine for disassembly. This effectively avoids production interruptions caused by filter element maintenance, ensures the continuous production of aerospace vanadium sheets, and improves overall production efficiency.

[0053] 5. Safe operation and strong controllability of operating conditions: Equipped with a pressure transmitter and alkali-resistant sight glass, it realizes real-time monitoring of equipment operating pressure and visual observation of pipeline operating conditions, forming a complete operating condition monitoring system. When the pressure exceeds the set range, it can provide timely warnings to avoid overpressure operation of equipment and improve the safety and controllability of equipment operation.

[0054] 6. Convenient installation and maintenance, strong industrial adaptability: The equipment adopts a hanging support method, which is convenient for on-site installation and fixing; the cable between the PLC control cabinet and the pneumatic valve has been pre-wired at the factory, and only the power and air supply need to be connected on-site to put it into use, reducing the amount of on-site installation work; the equipment is equipped with spare cylinder sealing rings made of fluororubber, which facilitates the later maintenance and replacement of the equipment and adapts to the actual use needs of industrial sites.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An apparatus for a dissolving and impurity removal process, characterized in that: The system includes a main filter cylinder, filter element assembly, pneumatic control assembly, PLC automatic control system, pressure detection component, auxiliary observation component, and sealing and protection component. The main filter cylinder is a vertical hollow structure with a hanging foot support installation structure. The main filter cylinder has a feed inlet (1), a discharge outlet (2), a backwash outlet (3), a backflush outlet (4), a vent / pressure outlet (5), a forward air outlet (6), a drain outlet (7), and a circulation outlet (8). The pneumatic control assembly is installed on the feed pipeline, discharge pipeline, backwash / backflush pipeline, and drain pipeline connected to the main filter cylinder. The filter element assembly is installed inside the main filter cylinder, and the pressure detection component is installed on the side wall of the main filter cylinder. The auxiliary observation component is installed on the feed pipeline, discharge pipeline, and backwash / backflush pipeline. The sealing and protection component is adapted to each connection part. The pneumatic control assembly and the pressure detection component are electrically connected to the PLC automatic control system.

2. The equipment for a dissolving and removing impurities process according to claim 1, characterized in that: The feed inlet (1), discharge outlet (2) and drain outlet (7) are all flange connection structures. The part of the main filter cylinder that contacts the material is made of S30408 ​​stainless steel. The outer surface of the main filter cylinder is matte and the inner surface is whitened.

3. The equipment for a dissolving and removing impurities process according to claim 1, characterized in that: The filter element assembly is a PA high molecular weight polyethylene sintered filter element with a filtration accuracy of ≤5 microns and an online backwashing and backflushing structure.

4. The equipment for a dissolving and removing impurities process according to claim 1, characterized in that: The pneumatic control component includes pneumatic valves and solenoid valves. The pneumatic valves are respectively installed on the feed pipe, discharge pipe, backwash and backflush pipe and sewage discharge pipe connected to the main filter cylinder. The solenoid valves are matched and linked with the pneumatic valves to realize the automatic switching of the pipelines.

5. The equipment for a dissolving and removing impurities process according to claim 1, characterized in that: The pressure detection component is a pressure transmitter, and the equipment's operating pressure is controlled between 0.1 and 0.5 MPa.

6. The equipment for a dissolving and removing impurities process according to claim 1, characterized in that: The auxiliary observation component includes three sight glasses, which are made of alkali-resistant glass.

7. The equipment for a dissolving and removing impurities process according to claim 1, characterized in that: The sealing and protective components include fluororubber seals and spare cylindrical sealing rings made of fluororubber. The fluororubber seals are adapted to the connection parts of various flanges, filter elements and sight glasses.

8. A method for a dissolving and removing impurities process, characterized in that... Includes the following steps: Step 1, filtration stage: The alkaline impurity removal sludge solution produced from aerospace vanadium sheets is introduced into the feed inlet through a pipeline. The PLC automatic control system sends a signal to the pneumatic control component, opening the solenoid valves of the feed and discharge pipelines, and closing the solenoid valves of the backwash and backflush pipelines and the drain pipeline. After the alkaline impurity removal sludge solution enters the main filter cylinder, it flows through the filter element assembly. Solid impurities are trapped by the filter element, and the clarified filtrate is discharged through the discharge port to enter the subsequent production process. During this stage, the equipment working pressure is controlled at 0.1-0.5 MPa. The pressure transmitter transmits the pressure signal to the PLC automatic control system in real time, and the flow status and clarity of the filtrate are observed through the sight glass. Step 2, Online Backwashing and Backflushing Stage: When the equipment has been filtering continuously for a certain period of time or the pressure inside the main filter cylinder reaches the threshold set by the PLC automatic control system, it enters the online backwashing and backflushing stage. The PLC automatic control system sends a signal to the pneumatic control component, the solenoid valves of the feed pipeline and the discharge pipeline close, and the backwashing and backflushing pipeline and the sewage discharge pipeline open. The external backwashing medium enters the main filter cylinder through the backwash port and the backflushing port to backwash and backflush the filter element assembly, flushing the solid impurities trapped on the surface of the filter element to the bottom of the main filter cylinder. This stage does not require machine shutdown. After the backwashing and backflushing is completed, the equipment switches back to the filtration stage. Step 3, the sludge and wastewater discharge stage: When solid impurities accumulate to a certain level at the bottom of the main filter cylinder, the sludge and wastewater discharge program is initiated through the PLC automatic control system. The PLC automatic control system sends a signal to the pneumatic control component, and the solenoid valve of the sludge discharge pipeline opens. The concentrated slurry of impurities in the cylinder is quickly discharged through the sludge discharge port. After the wastewater discharge is completed, the solenoid valve of the sludge discharge pipeline closes, and the equipment continues to operate in the filtration stage.

9. A method for a dissolution and impurity removal process according to claim 8, characterized in that: The PLC automatic control system is a non-explosion-proof PLC control cabinet with an AC input voltage of 220V, an input current of 5A, and a power supply line cross-sectional area ≥2.5mm². The PLC control cabinet is electrically connected to the pneumatic control components and pressure detection components. Before installation, the cable wiring with the pneumatic valves and solenoid valves is completed to realize one-button start-up and full-process automated control of the equipment.

10. A method for a dissolution and impurity removal process according to claim 9, characterized in that: The working medium of the equipment is an alkaline impurity removal sludge solution from the dissolution and impurity removal process in the production of aerospace vanadium sheets. The working temperature is 0-90℃, and the slag discharge method is concentrated slurry discharge.

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