Recycling device for copper-containing waste acid solution in production of saccharin sodium salt

Abstract

The invention discloses a recovery and treatment device for copper-containing waste acid liquid in saccharin sodium production, and relates to the technical field of recovery and treatment of copper-containing waste acid liquid, the recovery and treatment device comprises an equipment main body, a plurality of filter plates are slidably mounted on the equipment main body, and two supporting rollers are fixedly mounted on each filter plate; two extrusion plates are installed between every two corresponding supporting rollers in a sealed and sliding mode, the extrusion plates are installed on the corresponding filter plates in a sealed and sliding mode, heat conduction plates are fixedly installed on the extrusion plates, and filter cloth is fixedly installed on the heat conduction plates. The device has the advantages that through cooperation of the gas conveying assembly and the liquid conveying assembly, the thickness and speed of a filter cake obtained through matched filtration of two pieces of filter cloth can be increased, the subsequent dehydration effect of the device on the filter cake can be improved, meanwhile, through the pressure adjusting assembly, the dehydration extrusion force on the filter cake can be adjusted adaptively according to the needs of a user, and the dehydration efficiency is improved. Therefore, the quality of the filter cake finally recovered by the equipment, namely the copper material, can be improved.

Description

Technical Field

[0001] This invention relates to the field of copper-containing waste acid recovery and treatment technology, and in particular to a device for recovering and treating copper-containing waste acid in sodium saccharin production. Background Technology

[0002] In the production of sodium saccharin, the sulfonation reaction of its intermediates usually involves the use of catalysts. If copper salts (such as copper sulfate) are used as catalysts or participate in oxidation reactions in the process, copper ions will remain in the waste liquid (i.e. waste acid liquid) after the reaction is completed, forming "copper waste acid liquid". Since copper in copper waste acid liquid is a heavy metal with high recycling value, and direct discharge can easily harm the ecological environment and human health, recycling and treatment devices are usually used to recycle the copper in copper waste acid liquid. Currently, the main methods for copper recovery and treatment in "copper waste acid liquid" include neutralization precipitation, extraction, and electrolysis. Among them, the "alkali precipitation method" in the neutralization precipitation method mainly includes pretreatment, liquid pH adjustment, precipitation reaction, solid-liquid separation, copper recovery, and subsequent treatment. In order to improve the effect and efficiency of solid-liquid separation after precipitation, a chamber filter press is usually used to perform solid-liquid separation treatment on the mixture of copper hydroxide particles and copper hydroxide colloids after precipitation. In existing chamber filter presses, to reduce the moisture content of the filter cake composed of copper hydroxide particles and colloids after solid-liquid separation, a high-pressure fluid (such as compressed air, water, or oil) is usually introduced into the middle of the filter plate after the mixture is filtered into a filter cake. This causes the diaphragm on the filter plate to expand towards the filter cake side, squeezing and dewatering the filter cake. However, most existing chamber filter presses use a constant extrusion pressure. If the moisture content of the filter cake is inconsistent, the filter cake is prone to cracking or even pulverization, or insufficient dewatering, which reduces the quality of the final recovered filter cake, i.e., the recovered copper material. To address these issues, we propose a recovery and treatment device for copper-containing waste acid in sodium saccharin production. Summary of the Invention

[0003] The purpose of this invention is to solve the problems mentioned in the background art by providing a device for the recovery and treatment of copper-containing waste acid liquid in the production of sodium saccharin.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A device for recovering and treating copper-containing waste acid liquid in the production of sodium saccharin includes a main body of equipment. Multiple filter plates are slidably installed on the main body of equipment. Two support rollers are fixedly installed on each filter plate. Two extrusion plates are slidably and sealed between the corresponding two support rollers. The extrusion plates are slidably and sealed on the corresponding filter plates. A heat-conducting plate is fixedly installed on each extrusion plate. A filter cloth is fixedly installed on each heat-conducting plate. A liquid delivery assembly is provided between the filter plates to improve the uniformity of the filter cake thickness, and a pressure regulating assembly is provided between the filter plates to adaptively adjust the extrusion pressure on the filter cake. The adjustment assembly includes two support plates that are fixedly mounted on the pressing plate. A circular roller is slidably mounted through each support plate. A pressing plate is fixedly mounted on one end of each circular roller. An adjustment component is installed between the circular rollers. A pressure regulating mechanism is installed between the circular rollers. A pushing component is installed between the pressing plates.

[0005] Compared with existing technologies, the advantages of this invention are: 1. In the solid-liquid separation process of the equipment containing copper hydroxide particles and copper hydroxide colloids, the present invention uses a gas conveying component to heat and break down the colloids in the mixture. This helps to reduce the impact of the copper hydroxide colloids in the mixture on the solid-liquid separation effect and speed of the equipment, and helps to improve the speed of copper material recovery. At the same time, the liquid conveying component helps to improve the uniformity of contact between the mixture and the filter cloth, and improves the uniformity of the thickness of the filter cake formed by the two filter cloths. This helps to improve the uniformity of the overall dehydration of the filter cake in the subsequent process, and improves the quality of the final recovered filter cake, i.e., copper material.

[0006] 2: In the process of dewatering the filter cake, the present invention uses a pressure regulating component to adaptively adjust the pressure of the two extrusion plates, the heat-conducting plate, and the filter cloth to dewater the filter cake according to the user's desired final dewatering effect. This helps to further improve the quality of the final recycled filter cake, i.e., the recycled copper material. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of a device for recovering and treating copper-containing waste acid in the production of sodium saccharin, as proposed in this invention. Figure 2 for Figure 1 Schematic diagram of the middle filter plate; Figure 3 for Figure 2 An exploded view of the components on the middle filter plate; Figure 4 for Figure 3 A top view of the central pressing plate, the heat-conducting plate, and the filter cloth; Figure 5 for Figure 4 A schematic diagram of the structure of part A; Figure 6 for Figure 2 Schematic diagram of the structure of the intravenous infusion assembly; Figure 7 for Figure 6 Cross-sectional view of the middle filter plate; Figure 8 for Figure 7 A structural diagram of section B; Figure 9 for Figure 6 A schematic diagram of the components on the infusion tubing; Figure 10 for Figure 6 Schematic diagram of the structure of the medium-speed gas transmission assembly; Figure 11 for Figure 3 A schematic diagram of the internal components of the intermediate filter plate; Figure 12 for Figure 11 Schematic diagram of the voltage regulation component; Figure 13 for Figure 12 Schematic diagram of the middle pushing component; Figure 14 for Figure 13 A frontal view diagram; Figure 15 for Figure 12 Schematic diagram of the pressure regulating mechanism; Figure 16 for Figure 15 A top view of the components consisting of the central adjustment plate and the pressing plate; Figure 17 for Figure 15 Schematic diagram of the structure of the power transmission component; Figure 18 for Figure 17 A structural diagram of section C; Figure 19 for Figure 1 A schematic diagram of the structure of the drive component; Figure 20 for Figure 19 A schematic diagram of the structure of part D.

[0008] In the diagram: 1. Main body of the equipment; 2. Filter plate; 3. Support roller; 4. Extrusion plate; 5. Heat-conducting plate; 6. Filter cloth; 7. Infusion assembly; 71. Infusion tubing; 72. Nozzle 1; 73. Diverter tube; 74. Nozzle 2; 8. Gas delivery assembly; 81. Gas delivery pipe; 82. Baffle; 83. Gas delivery equipment; 84. Heater; 9. Pressure regulating assembly; 91. Rotating shaft; 92. Rotating gear; 93. Spur gear; 94. Gear plate; 95. Pushing component; 96. Telescopic rod one; 97. Round rod; 98. Telescopic rod two; 99. Push rod; 910. Rack; 911. Limiting rod; 912. Pressure regulating plate; 913. Round roller; 914. Pressing plate; 915. Support plate; 916. Movable plate; 917. Return spring; 918. Connecting frame; 919. Threaded rod one; 920. Adjusting plate; 10. Drive assembly; 101. Electric telescopic rod one; 102. Drive board; 103. Electric telescopic rod two; 104. Servo motor; 105. Threaded rod two; 106. Rack and pinion. Detailed Implementation

[0009] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0010] Reference Figures 1-20 A device for recovering and treating copper-containing waste acid in sodium saccharin production includes a main body 1. Multiple filter plates 2 are slidably installed on the main body 1. Two support rollers 3 are fixedly installed on each filter plate 2. Two extrusion plates 4 are slidably installed between the corresponding two support rollers 3. The extrusion plates 4 are slidably installed on the corresponding filter plates 2. Heat-conducting plates 5 are fixedly installed on each extrusion plate 4. Filter cloth 6 is fixedly installed on each heat-conducting plate 5.

[0011] Sodium saccharin is a commonly used artificial sweetener, characterized by its high sweetness and low cost, making it widely used in the food, pharmaceutical, and daily chemical industries. During the production of sodium saccharin, the sulfonation reaction of its intermediates (such as using concentrated sulfuric acid or fuming sulfuric acid) usually involves the use of a catalyst. If the process uses copper salts (such as copper sulfate) as a catalyst or participates in oxidation reactions, copper ions (Cu) will remain in the waste liquid (i.e., waste acid) after the reaction is complete. 2+ The process of producing "copper waste acid" involves the discharge of copper waste acid, which is a heavy metal. If this waste is discharged directly, it will pollute water and soil, and may harm the ecological environment and human health. At the same time, copper has high recycling value as a heavy metal. Therefore, existing recycling and treatment equipment is usually used to recycle the copper in the "copper waste acid" produced during the production of sodium saccharin.

[0012] Currently, the main methods for copper recovery and treatment from "copper waste acid liquid" include neutralization precipitation, extraction, and electrolysis. Among them, the "alkali precipitation method" in the neutralization precipitation method mainly includes the following steps for copper recovery and treatment from "copper waste acid liquid": pretreatment of waste acid liquid, pH adjustment of liquid, precipitation reaction, solid-liquid separation, copper recovery, and subsequent treatment. To improve the efficiency and effect of solid-liquid separation after the precipitation reaction of waste liquid, a chamber filter press is usually used to separate the solid and liquid after precipitation.

[0013] Reference Figures 1-10 A liquid delivery assembly 7 is provided between the filter plates 2 to improve the uniformity of the filter cake thickness, and a pressure regulating assembly 9 is provided between the filter plates 2 to adaptively adjust the extrusion pressure on the filter cake.

[0014] A gas delivery assembly 8 is provided between the filter plates 2. The gas delivery assembly 8 includes a gas delivery device 83 fixedly installed on the main body 1. A heater 84 is fixedly installed on the gas delivery device 83 in a linear and uniform distribution. A gas guide pipe is fixedly connected to the gas delivery device 83 in a linear and uniform distribution. A gas delivery pipe 81 is sealed through and rotatably installed on each of the filter plates 2. The gas delivery pipe 81 is connected to the corresponding gas guide pipe. The gas delivery pipe 81 is sealed through and rotatably installed on the corresponding liquid delivery pipe 71. A baffle plate 82 is fixedly installed on each of the gas delivery pipes 81 in a ring and uniform distribution.

[0015] When using the "alkali precipitation method" to recover copper from copper waste acid, it is common practice to introduce Cu... 2+ Add an alkali (such as NaOH or Ca(OH)2) to the waste acid solution. Once the pH of the waste solution is adjusted to between 5.0 and 6.5, Cu... 2+ With OH - This will combine to form copper hydroxide particles (Cu(OH)2). Furthermore, if the alkali added to the waste liquid is too quickly during pH adjustment of the copper waste acid solution, it can easily lead to localized OH- oxidation. - If the concentration is too high, a large number of tiny crystal nuclei will be generated. Before the crystal nuclei can grow, they will form colloidal particles, namely copper hydroxide colloids. (At the same time, if the generated copper hydroxide particles have a particle size of <100nm, Brownian motion is significant, and they are difficult to settle by their own gravity, copper hydroxide colloids will also be formed.) Therefore, during the extraction of copper materials from copper waste acid using the "alkali precipitation method", copper hydroxide particles and copper hydroxide colloids are usually generated.

[0016] When existing chamber filter presses perform solid-liquid separation on a mixture of copper hydroxide particles and colloids, the copper hydroxide colloid particles, typically 1-100 nm in size, are close to or smaller than the micropores of the filter cloth on the filter plate (most existing filter cloths are made of polypropylene or polyester, with pore sizes of approximately 5-20 μm). Therefore, when the filter cloth filters the mixture, the copper hydroxide colloids easily permeate through the filter cloth and enter the filtrate, causing the copper content in the filtrate to exceed the standard and reducing the equipment's copper recovery rate (e.g., a 5%-15% decrease). Simultaneously, when the copper hydroxide colloids adsorb onto the filter cloth surface, forming a "gel layer," they easily clog the micropores. This not only reduces the continuous filtration speed of the mixture, thus reducing the equipment's copper recovery speed, but also increases the relative burden on the two filter cloths. Intercepting the moisture content of the filter cake (i.e., copper material) reduces the quality of the copper material recovered by the equipment. (High moisture content filter cakes, especially those containing a lot of copper hydroxide colloids, have strong elastic buffering capacity due to their hydrogen bond network and high moisture content. When the filter press dewaters the filter cake, the colloids in the filter cake will first undergo elastic deformation, making it difficult for the bound water inside to be discharged. This easily reduces the dewatering effect of the equipment on the filter cake. The moisture in the filter cake may carry some impurity ions, such as copper ions and sulfate ions in copper hydroxide filter cakes. When the final recovered filter cake has a high moisture content, these impurity ions will enter subsequent processes with the moisture, easily reducing the purity of the product and affecting its quality and performance. For example, for some chemical products containing copper hydroxide, moisture may promote hydrolysis or other chemical reactions, leading to a decline in product quality and a shortened shelf life.)

[0017] Furthermore, although flocculants are usually added to the mixture before solid-liquid separation to reduce the impact of copper hydroxide colloids in the mixture on the speed and quality of copper recovery, thus increasing the particle size of the colloids, if the residual colloids in the mixture account for more than 5%, they will still slowly clog the filter cloth, reducing the quality and speed of copper recovery from the mixture.

[0018] Combination Figure 2As shown, each gas delivery pipe 81 is equipped with a sealing and rotating connecting pipe, and the gas guide pipe is fixedly connected to the corresponding connecting pipe. When the mixed liquid flows inside the liquid delivery pipe 71, the impact force generated by the liquid flow drives the gas delivery pipe 81 to rotate. At this time, the connection method between the gas delivery pipe 81 and the corresponding connecting pipe ensures the smooth flow of gas from the corresponding gas guide pipe to the corresponding gas delivery pipe 81 through the connecting pipe during this stage. At the same time, the ends of the multiple gas guide pipes connected to the corresponding connecting pipes are all elastic. The purpose is that when the filter plate 2 and the gas delivery pipe 81 need to be displaced during the extraction of copper material from the mixed liquid, the elastic setting of one end of the gas guide pipe facilitates the displacement of the gas delivery pipe 81. When the corresponding gas guide pipe is stretched by the connecting pipe, the smooth flow of gas from the gas guide pipe to the corresponding gas delivery pipe 81 is ensured.

[0019] Before the main body of the equipment 1 begins solid-liquid separation of the mixture containing copper hydroxide particles and copper hydroxide colloid, the gas conveying device 83 and multiple heaters 84 are started. The operation of the gas conveying device 83 is achieved through the cooperation of multiple gas guide pipes, connecting pipes, gas conveying pipes 81, and multiple air jets opened on the gas conveying pipes 81 (in combination with...). Figure 8 It can be seen that no air jet is opened on the end of the gas supply pipe 81 located in the middle of the corresponding liquid supply pipe 71. The purpose is to prevent the mixed liquid from entering the gas supply pipe 81, causing blockage inside the gas supply pipe 81 and loss of the mixed liquid. Gas is input into the interior of multiple filter plates 2, that is, between the two corresponding extrusion plates 4. The operation of multiple heaters 84 can heat the gas entering the interior of multiple filter plates 2.

[0020] Simultaneously, multiple infusion pipes 71 and multiple diversion pipes 73 are all heat-conducting pipes. When the hot air collected inside the filter plate 2 reaches a certain amount, the mixed liquid can be injected into the infusion pipes 71 through the existing infusion equipment. As the mixed liquid flows through the infusion assembly 7 and inside the infusion pipes 71 and diversion pipes 73, the hot air collected inside the filter plate 2 heats the infusion pipes 71 and multiple diversion pipes 73, achieving the effect of intermittently heating and breaking the gel in the mixed liquid. Since the stability of copper hydroxide colloid mainly depends on the charge repulsion on the surface of the colloidal particles and the protection of the hydration film, heating the mixed liquid can enhance the thermal motion of the colloidal particles, increasing the frequency and intensity of collisions between particles. This makes it easier for the particles to overcome the repulsive force generated by the surface charge, causing them to attract each other and aggregate into larger particles, which together with the original copper hydroxide particles form a filter cake. At the same time, the colloidal particles coagulate to form larger particles or flocs, whose particle size will be much larger than the pores of the filter cloth 6. This helps to reduce the clogging of the filter cloth 6 by the colloids in the mixture, ensuring the continuous filtration effect of the filter cloth 6 on the mixture. In addition, if a flocculant (such as iron salt, aluminum salt, etc.) is added to the mixture during the solid-liquid separation process, heating the mixture can also help to enhance the activity of the flocculant and accelerate the reaction rate between the flocculant and the colloidal particles, that is, improve the effect of the flocculant in promoting the coagulation of colloids and forming large particles.

[0021] Simultaneously, when the infusion tube 71 and the diversion tube 73 work together to input the mixed liquid into the space between the two opposing filter cloths 6, some of the hot air collected inside the filter plate 2 will pass through the multiple round holes opened on the extrusion plate 4 (in conjunction with...). Figure 3 As can be seen, the corresponding heat-conducting plate 5 is heated, and the heat-conducting plate 5 can pass its heat through the corresponding filter cloth 6, which can further heat the mixture collected between the two relative filter cloths 6 and the initially formed filter cake. This can help to further improve the gel breaking effect of the copper hydroxide colloid contained in the mixture of the equipment, and further improve the quality and speed of the equipment to recover the filter cake, that is, to recover the copper material.

[0022] Meanwhile, when the mixture flows inside the infusion pipe 71, the impact force generated by the liquid flow on the multiple baffles 82 can drive the multiple baffles 82 to rotate the corresponding gas infusion pipe 81. When the gas infusion pipe 81 is rotated under force, it can help improve the uniformity of gas supply from the gas infusion pipe 81 to the corresponding filter plate 2 through multiple round holes. This helps to improve the uniformity of heating the hot gas mixture and the filter cake initially formed on the filter cloth 6, thereby improving the speed and quality of copper material recovery by the equipment.

[0023] Each filter plate 2 is fixedly connected to an exhaust pipe (not shown in the figure), and each exhaust pipe is equipped with a vent valve. When hot air is continuously input into the filter plate 2 through the air supply pipe 81, when the air pressure inside the filter plate 2 reaches the automatic pressure relief value of the pressure relief valve, the pressure relief valve will open automatically to discharge the excess gas inside the filter plate 2. This ensures that new hot air can continuously enter the filter plate 2, that is, the hot air inside the filter plate 2 continuously heats and breaks up the mixture and the filter cake.

[0024] Reference Figures 2-10 The infusion assembly 7 includes support frames (shown in the figure but not labeled) that are respectively fixedly mounted on the filter plate 2. Figure 3 As can be seen from the image, each support frame is fixedly equipped with an infusion tube 71, each infusion tube 71 has multiple spray nozzles 72, and each infusion tube 71 is fixedly connected to a uniformly distributed annular diversion tube 73, each diversion tube 73 has multiple spray nozzles 74.

[0025] In existing filter presses, the injection holes on the filter plates are mostly located in the center. When the mixed liquid diffuses from the injection holes to the periphery of the filter chamber formed between two opposing filter cloths using existing liquid delivery equipment, the surface of the filter cloth in the central area will first contact the mixed liquid, forming an initial filter cake layer. As the filtration time increases, the filter cake thickness accumulates first in the central area. At this point, when the subsequently flowing mixed liquid flows to the periphery of the filter chamber, it must overcome the resistance of the already formed filter cake layer (the filter cake itself has poor permeability). Moreover, the pressure loss is greater and the flow rate gradually decreases with distance from the injection holes, especially at the corners of the filter chamber and other locations far from the center. Later in the filtration process and with lower flow rates, the amount of solid particles retained is less than in the central area, resulting in a thinner filter cake. In the later stages of filtration, the filter cake in the central area becomes thicker, its porosity decreases, and its permeability deteriorates, forming a "filtration resistance barrier." At this point, it becomes more difficult for the mixed liquor to flow to the edges, and "bridging" may even occur due to excessive compaction of the central filter cake. This results in almost no new slurry entering the edge area of ​​the filter cloth, ultimately further widening the overall thickness difference of the filter cake. When the filter cakes formed by the filtration of two different filter cloths are of different thicknesses, it not only easily reduces the uniformity of the overall dewatering of the filter cake in the subsequent equipment, but also reduces the overall recovery quality of the filter cake.

[0026] When using this device to perform solid-liquid separation of a mixture, after multiple filter plates 2 are combined one by one by the existing drive device on the main body 1, the mixture is injected into the infusion pipe 71 through the existing infusion device, and the mixture flows from the left end to the right end of the infusion pipe 71 (e.g.) Figure 8 As shown in the direction, the mixture passes through the constriction section of the infusion tube 71. Due to the narrowing of the tube diameter, the liquid velocity increases (according to the continuity equation Q=vA) while the pressure decreases (according to Bernoulli's principle). When the mixture continues to flow to the right end of the infusion tube 71, the liquid velocity gradually decreases and the pressure gradually recovers due to the increased tube diameter. At this point, under the influence of the pressure difference, the mixture will continuously spray out from the multiple nozzles 72 at the right end of the infusion tube 71 (even if the pressure in the expansion section at the right end of the infusion tube 71 is low). When the pressure is less than the inlet pressure at the left end, the mixture will be continuously sprayed out from the multiple spray nozzles 72 opened at the right end of the infusion pipe 71. This helps to improve the uniformity of contact between the mixture and the filter cloth 6 on the right side of the corresponding filter plate 2, and improve the filtration effect of the filter cloth 6 on the mixture. At the same time, during the process of spraying the mixture out from the multiple spray nozzles 72, it can also have a certain "pre-compression" effect on the thin layer of filter cake that has just formed on the surface of the filter cloth 6, so as to achieve the effect of compacting the filter cake pores in advance, that is, reducing the moisture content of the filter cake.

[0027] Simultaneously, as the mixed liquid flows through the constriction section of the infusion pipe 71, the impact force generated by the liquid flow on the corresponding multiple baffles 82 drives the corresponding multiple baffles 82 to rotate continuously. During this process, two relative baffles 82 can intermittently and briefly block the constriction section of the corresponding infusion pipe 71. At this time, by briefly intercepting the flowing mixed liquid at the left end of the corresponding infusion pipe 71 by the two relative baffles 82, the impact force of the continuously flowing liquid on the left side of the infusion pipe 71 can be increased, causing some of the mixed liquid to be sprayed out from multiple spray nozzles 72 at the left end of the infusion pipe 71. This helps to improve the uniformity of contact between the mixed liquid and the filter cloth 6 on the left side of the filter plate 2 (in conjunction with...). Figure 8 and Figure 9 (as shown in the direction) to improve the filtration effect of the filter cloth 6 on the mixed liquid.

[0028] Meanwhile, as the mixture accelerates its flow at the constriction end of the infusion pipe 71, some of the liquid flows into the corresponding multiple diversion pipes 73 and is evenly sprayed onto the surface of the corresponding filter cloth 6 from the multiple spray nozzles 74 opened on both sides of the diversion pipe 73. This helps to improve the uniformity of the overall contact between the mixture and the filter cloth 6, improve the uniformity of the overall thickness of the filter cake formed by the filtration of the two filter cloths 6, improve the uniformity of the overall dewatering of the filter cake by the subsequent equipment, and help to further improve the quality of the filter cake, i.e., copper material, recovered by the equipment.

[0029] Reference Figures 2-5 , Figures 11-20 The pressure regulating assembly 9 includes two support plates 915 that are fixedly installed on the extrusion plate 4. A circular roller 913 is slidably installed through the support plate 915. A pressing plate 914 is fixedly installed on one end of each circular roller 913 (in the initial state, the side of the pressing plate 914 is in contact with the side of the corresponding heat-conducting plate 5). An adjusting component is installed between the circular rollers 913. A pressure regulating mechanism is installed between the circular rollers 913. A pushing component is installed between the extrusion plates 4.

[0030] A drive assembly 10 is provided on the main body 1 of the equipment. The drive assembly 10 includes a fixed box fixedly installed on the main body 1 of the equipment. An electric telescopic rod 101 is fixedly installed on the fixed box. A drive plate 102 is fixedly installed at the lower end of the electric telescopic rod 101. An electric telescopic rod 2 103 is fixedly installed on the top wall inside the fixed box. A plate is fixedly installed on one end of the electric telescopic rod 2 103. A servo motor 104 is fixedly installed on the plate. A threaded rod 2 105 is fixedly installed on the drive end of the servo motor 104. A sliding block is threaded on the threaded rod 2 105. A rack rod 106 is fixedly installed on the sliding block.

[0031] The adjusting component includes movable plates 916 that are fixedly installed on the circular roller 913. A connecting frame 918 is fixedly installed between each of the two movable plates 916. An adjusting plate 920 is fixedly installed on each of the connecting frames 918. An arc-shaped groove is opened on each adjusting plate 920.

[0032] The pressure regulating mechanism includes threaded rods 919 rotatably mounted on the extrusion plate 4, each threaded rod 919 having a nut threaded onto it. Each nut has a pressure regulating plate 912 fixedly mounted on it, and the pressure regulating plates 912 pass through and slide on the corresponding two rollers 913. A return spring 917 is fixedly mounted between the pressure regulating plate 912 and the corresponding two movable plates 916. Limit rods 911 are fixedly mounted on each extrusion plate 4, and two positioning rods (shown in the figure but not labeled) are fixedly mounted on each extrusion plate 4. Figure 17 As can be seen from the image, the pressure regulating plate 912 is slidably mounted on the corresponding limit rod 911 and the two positioning rods, and the filter plate 2 is equipped with a force transmission component.

[0033] The power transmission components include elastic membranes fixedly installed on filter plates 2. Push rods 99 are sealed and fixedly installed through the elastic membranes. Fixing blocks are fixedly installed on the inner wall of filter plates 2. Two telescopic rods 98 are fixedly installed on each fixing block. The telescopic rods 98 are fixedly connected to the corresponding push rods 99. A rack 910 is fixedly installed on one end of each telescopic rod 98. A parallel shaft gear that meshes with the corresponding rack 910 is fixedly installed on each threaded rod 919.

[0034] During the solid-liquid separation process of the mixture collected between the two filter cloths 6, the filtrate filtered by the filter cloth 6 will flow from the gap between the filter cloth 6 and the corresponding heat-conducting plate 5 to the filtrate channels opened around the corresponding filter plate 2 (from... Figure 2 As can be seen from the image, the liquid is eventually discharged from the filtrate channel. When the filter cake formed by the solids intercepted by the two filter cloths 6 fills the entire filter cavity and the amount of liquid filtered out by the filter cloths 6 is extremely small, the solid-liquid separation of the mixture is completed.

[0035] Meanwhile, corresponding chamber filter presses, in order to reduce the moisture content of the final recovered filter cake, improve the quality of the final recovered filter cake (i.e., copper material), and reduce the difficulty of subsequent processing such as drying the filter cake, usually dehydrate the obtained filter cake after solid-liquid separation of the mixed liquid. For example, when two filter cloths are used together, the mixed liquid gathered in the middle is filtered into a filter cake. High-pressure fluid (such as compressed air, water, or oil) is injected into the middle of the filter plate, causing the diaphragm on the filter plate to expand towards the filter cake side and start to squeeze the filter cake through the corresponding filter cloth, thereby achieving the dehydration of the filter cake. However, most existing filter presses use a constant extrusion pressure (usually 1.0-2.0 MPa). At this time, even if the thickness and volume of the filter cake to be pressed are the same, the problem of inconsistent moisture content in the filter cake will lead to a large difference in the overall moisture content of the filter cake after dehydration, which will reduce the quality of the final recovered filter cake (i.e., copper material).

[0036] If the filtration performance and permeability of the filter cloth of the equipment are different, or if the copper hydroxide content and copper hydroxide particle size in the mixed liquid are different, it is easy to cause filter cakes of the same volume and thickness to have different moisture contents. If a constant extrusion pressure is used to dehydrate the filter cake, it is easy to over-press the filter cake with low moisture content, which is mainly composed of copper hydroxide particles, causing the filter cake to crack or even pulverize. When the filter cake structure is damaged, the particles will leak with the filtrate, increasing the turbidity of the filtrate and increasing the copper ion content in the filtrate. This will not only reduce the quality of the copper material recovered by the equipment, but also reduce the recovery rate of copper material in the mixed liquid. At the same time, if the constant extrusion pressure cannot fully dehydrate the filter cake with high moisture content, it may be necessary to perform secondary pressing or add subsequent drying processes, which will prolong the entire production cycle. Furthermore, when processing filter cakes with high moisture content, if the surface membrane of the filter plate is not elastic enough, it will not be able to fully expand and squeeze the filter cake when a high-pressure medium of 1.0-2.0MPa is introduced, which will also lead to the filter cake moisture content not reaching the expected effect. At the same time, in the pressing-depressurization cycle, the elastic rubber or plastic membrane will gradually decrease in elasticity after continuously undergoing expansion (pressure) and rebound (depressurization), that is, its squeezing effect on the filter cake will gradually decrease.

[0037] After the main body of the equipment 1 begins solid-liquid separation of the mixture containing copper hydroxide and copper hydroxide colloid, and multiple filter plates 2 are combined together, the initial pre-tightening force of multiple pressing plates 914 can be adjusted according to the user's required final filter cake moisture content. For example, the electric telescopic rod 101 can be started first. The electric telescopic rod 101 operates, driving the drive plate 102 to move upward (e.g., Figure 19 (As shown in the direction), applying an upward driving force to multiple push rods 99 can cause the push rods 99 to stretch upwards the corresponding two telescopic rods 98 (e.g., Figure 15 (As shown in the direction), causing the corresponding two telescopic rods 98 to extend upwards, causing the corresponding racks 910 to move upwards. The upward movement of the corresponding two racks 910 exerts a driving force on the corresponding parallel shaft gear, which causes the corresponding two threaded rods 919 to rotate, driving the corresponding pressure adjusting plate 912 to move and compress the corresponding return spring 917 (the thread directions of the corresponding two threaded rods 919 are set to be opposite. When the corresponding two racks 910 move upwards, they drive the corresponding threaded rods 919 to rotate through cooperation with the corresponding parallel shaft gear. At this time, the driving force exerted by the corresponding two threaded rods 919 on the corresponding pressure adjusting plate 912 can cause the corresponding two pressure adjusting plates 912 to move away from each other), until the initial preload of the corresponding two pressing plates 914 is adjusted to a suitable value.

[0038] Reference Figures 2-5 , Figures 11-20The pushing component includes a rotating shaft 91 that is sealed through and rotatably mounted on the filter plate 2. A rotating gear 92 is fixedly mounted on each rotating shaft 91. Two spur gears 93 are fixedly mounted on each rotating shaft 91. A support block is fixedly mounted on each extrusion plate 4. A telescopic rod 96 is fixedly mounted on each support block. A pushing component 95 is fixedly mounted on each telescopic rod 96. One side of the pushing component 95 is in contact with the surface of the corresponding extrusion plate 4. A toothed plate 94 that mates with the corresponding spur gear 93 is fixedly mounted on each pushing component 95. A round rod 97 that mates with the corresponding arc groove is fixedly mounted on each telescopic rod 96.

[0039] After the initial pre-tightening force of the multiple pressing plates 914 has been adjusted to be adaptable, and the solid-liquid separation of the mixed liquid collected in the middle has been completed relative to the two filter cloths 6, the electric telescopic rod 103 is started first. The operation of the electric telescopic rod 103 will cause the plate to drive the servo motor 104, the threaded rod 105 and the rack rod 106 to move down until the rack rod 106 meshes with the multiple rotating gears 92 (combined). Figure 19 and Figure 20 (as shown in the direction), and then start the servo motor 104. At this time, the servo motor 104 runs, and through the cooperation of the threaded rod 105 and the sliding block, drives the rack rod 106 to move to the left (as shown in the direction). Figure 20 (as shown in the direction), while the rack 106 moves to the left, the driving force applied to the multiple rotating gears 92 causes the multiple rotating shafts 91 to be subjected to force and rotate counterclockwise around their own axes.

[0040] When the rotating shaft 91 is subjected to force and rotates counterclockwise (such as...) Figure 14 (As shown in the direction), at this time, the driving force applied to the corresponding two toothed plates 94 by the rotating shaft 91 and the corresponding two spur gears 93 can drive the corresponding two toothed plates 94 to move the corresponding pushing parts 95 away from each other. During the process of the corresponding two pushing parts 95 being moved away from each other by force, the driving force applied to the corresponding extrusion plate 4 can make the corresponding two extrusion plates 4 move the corresponding heat-conducting plate 5 and filter cloth 6 away from each other. During the process of the two filter cloths 6 being moved closer to each other by force on the two adjacent filter plates 2, the filter cake formed between the two filter cloths 6 can be squeezed and dehydrated.

[0041] Simultaneously, in the initial stage of the extrusion plate 4 moving under force, the corresponding support plate 915, roller 913, threaded rod 919, and pressure adjusting plate 912 work together to cause the two pressing plates 914 to move together. When the two extrusion plates 4, two heat-conducting plates 5, and two filter cloths 6 work together to compress the moisture content of the filter cake to near the desired value, and at this point the moving resistance exerted by the filter cake on the pressing plate 914 through the two filter cloths 6 and the heat-conducting plates 5 is greater than the initial preload of the corresponding return spring 917, the moving resistance exerted by both sides of the filter cake on the pressing plate 914 will hinder the continuous movement of the pressing plate 914. Therefore, the two pressing plates 914 at this time... When plate 914, the corresponding roller 913, movable plate 916, connecting frame 918, and adjusting plate 920 are all stationary, the rotating shaft 91 is still rotating under force and is still engaged with the corresponding pushing member 95 through the toothed plate 94, driving the extrusion plate 4 and its supporting block, telescopic rod 96, and round rod 97 to move. In the stationary state, the arc-shaped groove on the adjusting plate 920 applies an upward driving force to the corresponding round rod 97, which drives the corresponding telescopic rod 96 to retract upward, causing the corresponding pushing member 95 and toothed plate 94 to move upward until the toothed plate 94 separates from the corresponding spur gear 93, at which point the extrusion plate 4, heat-conducting plate 5, and filter cloth 6 stop moving (in combination with...). Figure 17 and Figure 18 (As shown in the direction), the filter cake can be adaptively squeezed and dehydrated according to the moisture content of the final filter cake required by the user. This not only helps to improve the applicability of the equipment, but also further improves the quality of the final recycled filter cake, i.e., copper material.

[0042] After the equipment finishes pressing the filter cake, the filter plate 2 is gradually pulled by the existing drive equipment to release the filter cake between two adjacent filter plates 2. At this time, under the elastic force of the return spring 917, the corresponding pressing plate 914, roller 913, movable plate 916, connecting frame 918 and adjusting plate 920 can be driven to move and reset. During this process, through the cooperation of the corresponding arc groove and the round rod 97, the corresponding telescopic rod 96 can be driven to extend downward, and the corresponding pushing part 95 and toothed plate 94 can be driven to move downward until the toothed plate 94 re-meshes with the corresponding spur gear 93. Then, through the cooperation of the pushing part and the drive assembly 10, the extrusion plate 4, the heat-conducting plate 5 and the filter cloth 6 are driven to move and reset, so as to facilitate the subsequent solid-liquid separation treatment of the mixture.

[0043] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0044] In this invention, when the main body of the equipment 1 needs to perform solid-liquid separation treatment on a mixture of copper hydroxide particles and copper hydroxide colloids to recover copper from the waste liquid, hot air is first introduced into multiple filter plates 2 through the gas conveying component 8. When the existing liquid conveying equipment starts to introduce the mixture into the filter cavity formed between two adjacent filter plates 2, the hot air can heat the flowing mixture through the liquid conveying pipe 71 and the diversion pipe 73. At the same time, through the cooperation of the heat-conducting plate 5 and the filter cloth 6, the mixture inside the filter cavity and the initially formed filter cake can be further heated. This helps to achieve the gel breaking effect, reduce the impact of copper hydroxide colloids in the mixture on the speed and quality of the equipment's recovery of the filter cake, i.e., the recovery of copper, thus helping to improve the equipment's recovery speed and recovery quality of copper.

[0045] Meanwhile, when the existing infusion equipment begins to input the mixed liquid into the filter chamber, the cooperation of the infusion pipe 71 with the corresponding multiple spray nozzles 72, as well as the corresponding multiple diversion pipes 73 and multiple spray nozzles 74, can help improve the uniformity of the overall contact between the mixed liquid and the filter cloth 6, that is, help improve the uniformity of the overall thickness of the filter cake formed by the filtration of the two filter cloths 6. This not only helps to improve the uniformity of the overall dewatering of the filter cake in the subsequent equipment and improve the quality of the final recovered filter cake, i.e., copper material, but also, to a certain extent, increases the recovery speed of copper material by the equipment.

[0046] When the equipment begins solid-liquid separation of the mixture, an appropriate initial pre-tightening force can be applied to multiple pressing plates 914 through the pressure regulating mechanism according to the moisture content of the filter cake required by the user. After the two filter cloths 6 have completed the solid-liquid separation of the mixture gathered in the middle, the pushing component can drive the two squeezing plates 4, the heat-conducting plate 5, and the filter cloth 6 to move in coordination to squeeze and dehydrate the filter cake. When the moisture content of the filter cake gradually decreases (i.e., close to the moisture content required by the user), the hardness gradually increases, and the resistance applied by both sides of the filter cake to the corresponding pressing plate 914 is greater than the pre-tightening force of the corresponding return spring 917, the squeezing plate 4, the heat-conducting plate 5, and the filter cloth 6 can be stopped in time through the cooperation of the pressure regulating mechanism and the adjusting component to squeeze and dehydrate the filter cake. This can help to further improve the quality of the final recovered filter cake, i.e., copper material.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for recovering and treating copper-containing waste acid liquid in the production of sodium saccharin, comprising a main body (1), wherein multiple filter plates (2) are slidably mounted on the main body (1), characterized in that, Two support rollers (3) are fixedly installed on each of the filter plates (2). Two extrusion plates (4) are sealed and slidably installed between the two support rollers (3). The extrusion plates (4) are sealed and slidably installed on the corresponding filter plates (2). A heat-conducting plate (5) is fixedly installed on each of the extrusion plates (4). A filter cloth (6) is fixedly installed on each of the heat-conducting plates (5). An infusion assembly (7) is provided between the filter plates (2) to improve the uniformity of the filter cake thickness. A pressure regulating assembly (9) is provided between the filter plates (2) to adaptively adjust the squeezing pressure on the filter cake. The pressure regulating assembly (9) includes two support plates (915) respectively fixedly installed on the extrusion plate (4). A circular roller (913) is slidably installed through the support plate (915). A pressing plate (914) is fixedly installed on one end of the circular roller (913). An adjusting component is installed between the circular rollers (913). A pressure regulating mechanism is installed between the circular rollers (913). A pushing component is installed between the extrusion plates (4).

2. The device for recovering and treating copper-containing waste acid liquid in sodium saccharin production according to claim 1, characterized in that, The infusion assembly (7) includes a support frame that is fixedly installed on the filter plate (2). Each support frame is fixedly installed with an infusion tube (71). Each infusion tube (71) has multiple spray nozzles (72). Each infusion tube (71) is fixedly connected to a diversion tube (73) that is evenly distributed in a ring. Each diversion tube (73) has multiple spray nozzles (74).

3. The device for recovering and treating copper-containing waste acid liquid in sodium saccharin production according to claim 2, characterized in that, A gas conveying assembly (8) is provided between the filter plates (2). The gas conveying assembly (8) includes a gas conveying device (83) fixedly installed on the main body of the equipment (1). A heater (84) with a linear uniform distribution is fixedly installed on the gas conveying device (83). A gas guide pipe with a linear uniform distribution is fixedly connected to the gas conveying device (83). Each filter plate (2) is sealed and rotatably installed with a gas delivery pipe (81), and each gas delivery pipe (81) is connected to a corresponding gas guide pipe. Each gas delivery pipe (81) is sealed and rotatably installed on a corresponding liquid delivery pipe (71). Each gas delivery pipe (81) is fixedly installed with a ring-shaped baffle plate (82).

4. The device for recovering and treating copper-containing waste acid in sodium saccharin production according to claim 1, characterized in that, The adjusting component includes movable plates (916) respectively fixedly installed on the circular roller (913), and a connecting frame (918) is fixedly installed between each of the two movable plates (916). An adjusting plate (920) is fixedly installed on each of the connecting frames (918), and an arc-shaped groove is opened on each of the adjusting plates (920).

5. The device for recovering and treating copper-containing waste acid liquid in sodium saccharin production according to claim 4, characterized in that, The pressure regulating mechanism includes a threaded rod (919) rotatably mounted on the extrusion plate (4), each threaded rod (919) having a nut threaded on it, and each nut having a pressure regulating plate (912) fixedly mounted on it. The pressure regulating plates (912) are slidably mounted on the corresponding two rollers (913), and each pressure regulating plate (912) has a return spring (917) fixedly mounted between it and the corresponding two movable plates (916). Limiting rods (911) are fixedly installed on each of the extrusion plates (4), and two positioning rods are fixedly installed on each of the extrusion plates (4). The pressure regulating plates (912) are all slidably installed on the corresponding limiting rods (911) and the two positioning rods. The filter plate (2) is equipped with a force transmission component.

6. The device for recovering and treating copper-containing waste acid liquid in sodium saccharin production according to claim 5, characterized in that, The power transmission component includes an elastic membrane fixedly installed on the filter plate (2), a push rod (99) is sealed through and fixedly installed on the elastic membrane, a fixing block is fixedly installed on the inner wall of the filter plate (2), and two telescopic rods (98) are fixedly installed on each fixing block, and the telescopic rods (98) are fixedly connected to the corresponding push rods (99); A rack (910) is fixedly installed on one end of each of the telescopic rods (98), and a parallel shaft gear that meshes with the corresponding rack (910) is fixedly installed on each of the threaded rods (919).

7. The device for recovering and treating copper-containing waste acid liquid in sodium saccharin production according to claim 4, characterized in that, The pushing component includes a rotating shaft (91) that is sealed through and rotatably mounted on the filter plate (2). A rotating gear (92) is fixedly mounted on each rotating shaft (91), and two spur gears (93) are fixedly mounted on each rotating shaft (91). Each of the extrusion plates (4) is fixedly equipped with a support block, each of the support blocks is fixedly equipped with a telescopic rod (96), each of the telescopic rods (96) is fixedly equipped with a pusher (95), each of the pushers (95) is fixedly equipped with a toothed plate (94) that mates with the corresponding spur gear (93), and each of the telescopic rods (96) is fixedly equipped with a round rod (97) that mates with the corresponding arc groove.

8. The device for recovering and treating copper-containing waste acid liquid in sodium saccharin production according to claim 1, characterized in that, The device body (1) is provided with a drive assembly (10). The drive assembly (10) includes a fixed box fixedly installed on the device body (1). An electric telescopic rod (101) is fixedly installed on the fixed box. A drive plate (102) is fixedly installed at the lower end of the electric telescopic rod (101). An electric telescopic rod two (103) is fixedly installed on the top wall inside the fixed box. A plate is fixedly installed on one end of the electric telescopic rod two (103). A servo motor (104) is fixedly installed on the plate. A threaded rod two (105) is fixedly installed on the drive end of the servo motor (104). A sliding block is threaded on the threaded rod two (105). A rack rod (106) is fixedly installed on the sliding block.

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