Filter for hydrometallurgy of zinc

Abstract

The present invention discloses a filter for hydrometallurgy of zinc, which relates to the technical field of filters. It includes: a main body, the main body is provided with a feed inlet, a slag discharge port is arranged on the lower side of the main body, a liquid discharge pipe is fixedly connected to the main body, and a plurality of filter plates which are fixedly connected to the liquid discharge pipe and are equidistantly distributed in the main body are provided, and the filter plates are communicated with the liquid discharge pipe; a main ring, which is arranged in the main body, a secondary ring is arranged in the main body near the main ring, and scraping plates which are rotatably connected to the main ring are arranged on both sides of the filter plates. The present invention utilizes the scraping plates to scrape off the excess filter cake on the surface of the filter plates during the operation of the plate filter. On the one hand, it is not necessary to stop the machine for cleaning, reducing the cleaning steps. On the other hand, the remaining filter cake on the surface of the filter plates is directly used to filter the subsequent leaching solution and purification solution, without waiting for the filter cake to regenerate again and without interrupting the production process, the system has high continuity, and at the same time, the overall metallurgical efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and particularly to filters for hydrometallurgical zinc production. Background Art

[0002] Hydrometallurgical zinc production is a process for extracting metallic zinc from zinc ores through wet chemical methods, which has the characteristics of low energy consumption, strong environmental friendliness, and suitability for treating low-grade and complex ores. Its process mainly includes ore preparation, roasting, leaching, solution purification, electrolytic deposition, casting, and resource recovery. In the leaching and solution purification processes, plate filters are required to separate solid and liquid in the leaching solution and purification solution. The equipment relies on the filter plates inside to intercept solid particles. Among them, the liquid components in the leaching solution and purification solution pass through the filter plates and are discharged, while the solid particles gradually adhere to the surface of the filter plates under the action of pressure difference to form filter cakes. Plate filters mainly use the double filtration effects of the filter plates and filter cakes to separate solid and liquid in the leaching solution and purification solution. However, as the use time of the plate filter increases, the thickness of the filter cake gradually increases, resulting in an increase in the force required for the liquid to pass through the filter cake, leading to an increase in the internal pressure of the equipment and a decrease in the filtration efficiency. At this time, the filter plates need to be cleaned. The existing cleaning process mainly adopts the method of shutdown operation, that is, after shutdown, the filter cake is separated from the filter plates by means of vibration, backwashing, etc. However, after the equipment is restarted, a new filter cake layer needs to be established, resulting in the interruption of the production process, which not only affects the continuity of the system operation but also leads to low overall metallurgical efficiency. Summary of the Invention

[0003] The present invention provides a filter for hydrometallurgical zinc production to overcome the disadvantages of the existing cleaning method of plate filters used in the process of hydrometallurgical zinc production, such as interruption of the production process, poor continuity of system operation, and low overall metallurgical efficiency.

[0004] The technical implementation solution of the present invention is as follows: A filter for hydrometallurgical zinc production, comprising:

[0005] A main body, the main body is provided with a feed inlet, a slag discharge port is arranged on the lower side of the main body, a drain pipe is fixedly connected to the main body, the drain pipe passes through the main body and is fixedly connected with a plurality of filter plates located inside the main body and evenly distributed, and the filter plates are communicated with the drain pipe;

[0006] A main ring, arranged inside the main body, a secondary ring is arranged inside the main body near the main ring, scraping plates rotatably connected to the main ring are arranged on both sides of the filter plates, the scraping plates are in limiting sliding connection with the secondary ring, the scraping plates are in limiting sliding connection with a positioning column in limiting sliding connection with the main ring, the positioning column is rotatably connected with the secondary ring, and the scraping plates are used for thinning the filter cakes adhered to the surfaces of adjacent filter plates.

[0007] Further, two clamping columns are hermetically and slidably connected to the main body. Both of the two clamping columns pass through the main body and are in contact with the main ring and the sub-ring. The clamping columns are used to drive the main ring and the sub-ring to move. A cleaning push rod is installed on the main body, and the telescopic end of the cleaning push rod is fixedly connected to one end of the two clamping columns away from the main ring.

[0008] Further, a sub-adjusting shaft is rotatably connected to a position of the clamping column close to the main ring. A gear-rack transmission is provided between the sub-adjusting shaft and the sub-ring. A main adjusting member rotatably connected to the sub-adjusting shaft is rotatably connected in the clamping column. A gear-rack transmission is provided between the main adjusting member and the main ring.

[0009] Further, extrusion columns are slidably connected to one sides of the sub-adjusting shaft and the main adjusting member away from the main ring. First springs are fixedly connected between the sub-adjusting shaft and the main adjusting member and the adjacent extrusion columns respectively. A plurality of limiting grooves are provided at a position of the clamping column close to the sub-adjusting shaft. The limiting grooves are used to limit the adjacent extrusion columns.

[0010] Further, two extrusion cylinders are fixedly connected to a position of the main body away from the main ring. The extrusion cylinders are used to extrude two adjacent extrusion columns on the adjacent clamping columns and release the limiting relationship between the extrusion columns and the adjacent limiting grooves. A guiding cylinder is fixedly connected in the extrusion cylinder. The guiding cylinder is used to extrude two adjacent extrusion columns on the adjacent clamping columns and rotate the sub-adjusting shaft and the main adjusting member.

[0011] Further, a plurality of shearing assemblies equal in number to the scraping plates are further included, which are respectively arranged on the adjacent scraping plates and used to assist the scraping plates in cutting the filter cake. The shearing assembly includes:

[0012] A connecting rod, which is slidably connected in the scraping plate. A sliding column is fixedly connected to the connecting rod. The sliding column is slidably connected to the scraping plate, and a second spring is fixedly connected between the two;

[0013] A cutting strip, which is fixedly connected to the connecting rod and is in limited sliding connection with the scraping plate. A plurality of static teeth are provided on the scraping plate, and a plurality of moving teeth are provided on the cutting strip;

[0014] A corrugated cylinder, which is fixedly connected in the main body. One end of the sliding column away from the adjacent connecting rod is in contact with the corrugated cylinder. The corrugated cylinder is used to move the sliding column back and forth.

[0015] Further, the static teeth and the moving teeth are respectively located on the lower sides of the adjacent scraping plates and the adjacent cutting strips.

[0016] Furthermore, a guiding shell is fixedly connected to the side of the scraping plate away from the adjacent filter plate, and the guiding shell is used to change the movement trajectory of the cut-off part of the filter cake.

[0017] Furthermore, it further includes:

[0018] A flow dividing member, fixedly connected to a position in the main body close to the feed inlet, and the flow dividing member is used to disperse the fluid entering the main body from the feed inlet.

[0019] Furthermore, a slag discharging member is sealingly and slidably connected in the slag discharging port, and a slag discharging push rod is installed on the main body, and the telescopic end of the slag discharging push rod is fixedly connected to the slag discharging member.

[0020] The advantages and positive effects of the present invention compared with the prior art are as follows: During the operation of the plate filter, the present invention uses a scraping plate to scrape off the excess filter cake on the surface of the filter plate. On the one hand, there is no need to stop the machine for cleaning, reducing the cleaning steps. On the other hand, the remaining filter cake on the surface of the filter plate is directly used to filter the subsequent leaching solution and purification solution, without waiting for the filter cake to regenerate, without interrupting the production process, the system has high continuity, and at the same time the overall metallurgical efficiency is high.

[0021] The gap between the scraping plate and the filter plate is adjusted by using a guiding cylinder, so that the device can adapt to a variety of usage scenarios and improve the applicable range of the device.

[0022] The reciprocating misaligned movement of the moving teeth and the static teeth is used to shear the filter cake containing colloid (the filter cake of the leaching solution contains iron hydroxide colloid), reducing the probability of filter cake tearing, maintaining the flatness of the filter cake surface, and thus maintaining the filtering effect of the subsequent filter cake on the leaching solution and purification solution.

[0023] The intermittent discharging is realized by using the slag discharging member. Therefore, when the main body is not stopped, the excess filter cake in the main body can be discharged, and at the same time, the influence of the discharging process on the pressure in the main body can be reduced, and the filtering efficiency of the device can be kept stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 is a three-dimensional structural schematic diagram of the filter plate, main ring and sub-ring of the present invention;

[0026] Figure 3 is a three-dimensional structural schematic diagram of the drain pipe, filter plate and main ring of the present invention;

[0027] Figure 4 is a three-dimensional structural schematic diagram of the sub-ring, scraping plate and positioning column of the present invention;

[0028] Figure 5 is a three-dimensional structural schematic diagram of the scraping plate, sliding column and guiding shell of the present invention;

[0029] Figure 6 This is a three-dimensional structural sectional view of the scraper and positioning column of the present invention;

[0030] Figure 7 This is a three-dimensional structural schematic diagram of the clamping column and extrusion column of the present invention;

[0031] Figure 8 This is a three-dimensional structural schematic diagram of the auxiliary adjustment shaft, main adjustment part and extrusion column of the present invention;

[0032] Figure 9 This is an exploded view of the clamping column, auxiliary adjustment shaft and main adjustment part of the present invention;

[0033] Figure 10 This is a three-dimensional structural schematic diagram of the extrusion cylinder and guiding cylinder of the present invention;

[0034] Figure 11 This is a three-dimensional structural schematic diagram of the connecting rod, sliding column and cutting strip of the present invention;

[0035] Figure 12 This is a three-dimensional structural schematic diagram of the filter plate, scraper and guiding shell of the present invention.

[0036] The markings of each component in the attached drawings are as follows: 1 - main body, 101 - feed inlet, 102 - slag discharge port, 2 - drain pipe, 3 - filter plate, 4 - main ring, 5 - auxiliary ring, 6 - scraper, 601 - static tooth, 7 - positioning column, 8 - clamping column, 9 - cleaning push rod, 10 - auxiliary adjustment shaft, 11 - main adjustment part, 12 - extrusion column, 121 - limit groove, 13 - extrusion cylinder, 14 - guiding cylinder, 15 - connecting rod, 16 - sliding column, 17 - cutting strip, 171 - moving tooth, 18 - corrugated cylinder, 19 - guiding shell, 20 - flow dividing part, 21 - slag discharging part, 22 - slag discharging push rod. Detailed implementation manners

[0037] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures pointed out in the specification and drawings.

[0038] Filter for hydrometallurgical zinc production, see Figures 1-6, comprising: a main body 1, the main body 1 is provided with a feed inlet 101, a slag discharge port 102 is provided on the lower side of the main body 1, the main body 1 is fixedly connected with a drain pipe 2, the drain pipe 2 passes through the main body 1 and is fixedly connected with a plurality of filter plates 3 which are equidistantly distributed inside the main body 1, and the filter plates 3 are communicated with the drain pipe 2; a main ring 4, arranged inside the main body 1, a secondary ring 5 is arranged inside the main body 1 near the main ring 4, scraping plates 6 rotatably connected with the main ring 4 are arranged on both sides of the filter plates 3, the scraping plates 6 are in limit sliding connection with the secondary ring 5, the scraping plates 6 are in limit sliding connection with positioning columns 7 which are in limit sliding connection with the main ring 4, the positioning columns 7 are rotatably connected with the secondary ring 5, and the scraping plates 6 are used for thinning the filter cakes adhered to the surfaces of adjacent filter plates 3; two clamping columns 8 are in sealed sliding connection with the main body 1, both clamping columns 8 pass through the main body 1 and are in contact with the main ring 4 and the secondary ring 5, and the clamping columns 8 are used for driving the main ring 4 and the secondary ring 5 to move, and a cleaning push rod 9 is installed on the main body 1, and the telescopic end of the cleaning push rod 9 is fixedly connected with one end of the two clamping columns 8 far away from the main ring 4.

[0039] In the above solution, it aims to solve the problems of interruption of the production process, poor continuity of the system operation and low overall metallurgical efficiency in the cleaning method of the plate filter used in the wet zinc metallurgy process; in this solution, the scraping plate 6 is used to scrape off the excess part of the filter cake on the surface of the filter plate 3 during the operation of the plate filter. On the one hand, there is no need to stop the machine for cleaning, reducing the cleaning steps. On the other hand, the remaining filter cake on the surface of the filter plate 3 is directly used to filter the subsequent leaching solution and purification solution, without waiting for the filter cake to regenerate, without interrupting the production process, with high system continuity and high overall metallurgical efficiency at the same time; the main body 1 is composed of a bracket, a cylinder body and a cylinder cover; the position of the feed inlet 101 can be adjusted according to the actual situation, and here the feed inlet 101 is located at the lower part of the main body 1; the drain pipe 2 is communicated with the feed pipeline in the subsequent process through a flange; the number of the filter plates 3 can be adjusted according to the actual situation, and the number of the filter plates 3 in this article is six; a pressure sensor and a control terminal can be installed inside the main body 1, the pressure sensor is used to monitor the pressure inside the main body 1, and the control terminal is used to judge the thickness of the filter cake according to the reading of the pressure sensor; the control terminal is electrically connected with the cleaning push rod 9; the upper side of the filter plate 3 is fixed inside the main body 1 through a connection structure, and this connection structure is an existing device and will not be elaborated here.

[0040] The filter screen of the filter plate 3 is a multi-layer structure composed of various types of stainless steel wire meshes, and the aperture of the stainless steel wire mesh gradually decreases from the inside to the outside. The multi-layer design can ensure the filtration quality, improve the filtrate purity, reduce the pressure drop, reduce the energy consumption and operation and maintenance costs, and the type and number of wire meshes can be selected according to the actual situation to maximize the filtration capacity and filtration efficiency; the filter plate 3 is a frame structure as a whole, and is connected by riveting, welding or bolt connection (not specifically shown in the attached drawings). Even in high-pressure situations, the structure can be ensured to be stable and reliable, and the maintenance probability can be reduced; the filter plate 3 can be processed and manufactured with 304L, 316L, 904L or special duplex steel. Even in harsh application environments, it can ensure good service life and stress corrosion resistance.

[0041] The two scrapers 6 corresponding to the same filter plate 3 are respectively located on its left and right sides, and the rotation axes of the two scrapers 6 are respectively located on the front and rear sides of the adjacent filter plate 3. The positioning column 7 is located on the side of the adjacent scraper 6 away from its rotation axis. In the normal direction of the filtration surface of the filter plate 3, the minimum distance between the two scrapers 6 and the adjacent filter plate 3 is equal. Initially, the gap between the scraper 6 and the adjacent filter plate 3 is the largest; the number of clamping columns 8 can be adjusted according to the actual situation. In this article, the two clamping columns 8 jointly clamp the main ring 4 and the sub-ring 5.

[0042] See Figures 1-3 、 Figure 5 and Figures 7-10 As shown in

[0043] There is a secondary adjustment shaft 10 rotatably connected at a position close to the main ring 4 inside the clamping column 8. The secondary adjustment shaft 10 and the sub-ring 5 are driven by a gear-rack transmission. There is a main adjustment member 11 rotatably connected to the secondary adjustment shaft 10 inside the clamping column 8. The main adjustment member 11 and the main ring 4 are driven by a gear-rack transmission; on the sides of the secondary adjustment shaft 10 and the main adjustment member 11 away from the main ring 4, there are sliding-connected extrusion columns 12 respectively. There are first springs fixedly connected between the secondary adjustment shaft 10 and the main adjustment member 11 and the adjacent extrusion columns 12 respectively. There are a plurality of limiting grooves 121 provided at a position close to the secondary adjustment shaft 10 inside the clamping column 8. The limiting grooves 121 are used to limit the adjacent extrusion columns 12; there are two extrusion cylinders 13 fixedly connected at a position away from the main ring 4 inside the main body 1. The extrusion cylinders 13 are used to extrude the adjacent two extrusion columns 12 on the adjacent clamping column 8 and release the limiting relationship between the extrusion columns 12 and the adjacent limiting grooves 121. There is a guiding cylinder 14 fixedly connected inside the extrusion cylinder 13. The guiding cylinder 14 is used to extrude the adjacent two extrusion columns 12 on the adjacent clamping column 8 and make the secondary adjustment shaft 10 and the main adjustment member 11 rotate.In the above solution, it is aimed to adjust the gap between the scraper 6 and the filter plate 3 by using the guide cylinder 14, so that the device can adapt to a variety of usage scenarios (when using this device to perform solid-liquid separation on leaching solution and purification solution, due to the different solid particles in the leaching solution and purification solution, the density of the formed filter cake is different, that is, the final required remaining filter cake thickness is different), improving the applicable range of this device; the secondary adjustment shaft 10 is an L-shaped part composed of two mutually perpendicular connecting columns, the main adjustment part 11 is an L-shaped part composed of a connecting column and a hollow stepped column, and there is a through groove on the upper part of the stepped column of the main adjustment part 11 for the connecting column of the secondary adjustment shaft 10 to slide; the transmission structures (i.e., gear racks) between the main adjustment part 11 and the main ring 4 and between the secondary adjustment shaft 10 and the secondary ring 5 can be replaced according to the actual usage situation, and a housing that is hermetically and slidably connected to both the main ring 4 and the secondary ring 5 can be arranged at the lower part of the clamping column 8, and this housing is used to reduce the influence of solid particles in the leaching solution and purification solution on the gear racks between the main adjustment part 11 and the main ring 4 and between the secondary adjustment shaft 10 and the secondary ring 5; one end of the extrusion column 12 far from the central axis of the adjacent clamping column 8 is hemispherical; initially, the extrusion column 12 contacts and is limited by the adjacent limiting groove 121 under the action of its first spring therein; the inner diameter of the extrusion cylinder 13 is smaller than the maximum distance between the extrusion column 12 in the direction of its central axis and the central axis of the adjacent clamping column 8, and the difference between the two is smaller than the radius of the hemispherical end face of the extrusion column 12, so that when the clamping column 8 drives the extrusion column 12 to move, the extrusion column 12 can extrude the extrusion cylinder 13; the lower side of the guide cylinder 14 is an inclined surface, and the lowest point of the inclined surface of the guide cylinder 14 is located between two adjacent extrusion columns 12 on the adjacent clamping column 8; the position where the extrusion column 12 contacts the adjacent limiting groove 121 is a protrusion, and the edge of this protrusion can be provided with an inclined surface to facilitate the protrusion of the extrusion column 12 to enter the adjacent limiting groove 121.

[0044] See Figure 1 and Figure 2 , a slag discharging member 21 is hermetically and slidably connected in the slag discharging port 102, the main body 1 is provided with a slag discharging push rod 22, and the telescopic end of the slag discharging push rod 22 is fixedly connected to the slag discharging member 21.

[0045] In the above solution, it is aimed to use the slag discharging member 21 to achieve intermittent discharging, so that while the main body 1 is in operation, it can not only discharge the filter cake (subsequently referred to as sludge for short) removed from the main body 1, but also reduce the influence of the discharging process on the pressure inside the main body 1, and maintain the stable filtration efficiency of this device; the slag discharging member 21 is successively composed of a piston, a frustum and a cylinder from top to bottom, wherein the piston is used to maintain the seal between the slag discharging member 21 and the slag discharging port 102, the frustum is used to guide the sludge located between the frustum and the piston to fall outside the main body 1, and at the same time, micropores are provided on the surface of the frustum, and these micropores are used to communicate the space between the piston and the frustum of the slag discharging member 21 with the outside; the control terminal is electrically connected to the slag discharging push rod 22.

[0046] The working principle of the above solution is as follows: In the process of hydrometallurgical zinc production, when using a plate filter to separate solid and liquid from leaching solution and purification solution (hereinafter referred to as fluid for the above two liquids), the feed port 101 is connected to the liquid outlet pipe of the previous process; the fluid enters the main body 1 through the feed port 101, causing the liquid level in the main body 1 to gradually rise. At the same time, the original gas in the main body 1 is discharged through the filter plate 3 and the drain pipe 2. When the liquid level in the main body 1 gradually contacts the filter plate 3, the liquid component in the fluid in the main body 1 slowly enters the filter plate 3 under the action of gravity and is discharged through the drain pipe 2. At the same time, the liquid level of the fluid in the main body 1 continues to rise until the liquid level of the fluid in the main body 1 submerges the filter plate 3. As the fluid continues to be transported into the main body 1, a pressure difference is generated between the inside of the main body 1 and the inside of the drain pipe 2 and the filter plate 3. At this time, the fluid flows into the filter plate 3. The filter plate 3 intercepts the solid particles in the fluid, and the solid particles accumulate on the left and right sides of the filter plate 3 to form a filter cake. The liquid component in the fluid sequentially enters the filter plate 3 and the drain pipe 2 and is finally discharged through the drain pipe 2. When the worker observes that the clarity of the liquid discharged from the drain pipe 2 meets the standard (judged according to the process requirements of hydrometallurgical zinc production), the worker records the time required from when the fluid enters the main body 1 to when the clarity of the liquid discharged from the drain pipe 2 meets the standard, and calculates the thickness of the filter cake corresponding to when the clarity of the liquid discharged from the drain pipe 2 meets the standard (hereinafter referred to as the initial thickness) in combination with the concentration of solid particles in the fluid, the flow rate of the fluid, and the total area of the filtration surfaces of the six filter plates 3. The worker connects the drain pipe 2 to the liquid inlet pipe of the next process using a flange, and thus starts the solid-liquid separation operation on the fluid.

[0047] During the operation of this device, as the usage time increases, the thickness of the filter cake gradually increases, resulting in an increase in the force required for the liquid component to penetrate the filter cake, leading to an increase in the pressure inside the main body 1. During the operation of this device, the control terminal reads the reading of the pressure sensor in real time and judges the thickness of the filter cake based on the reading of the pressure sensor. When it is judged that the filter cake on the filter plate 3 needs to be cleaned, the control terminal starts the cleaning push rod 9. The telescopic end of the cleaning push rod 9 extends and drives the two clamping columns 8 to move upward. The two clamping columns 8 together drive the main ring 4, the auxiliary ring 5, the auxiliary adjustment shaft 10, the main adjustment part 11, and the extrusion column 12 to move upward together. The main ring 4 and the auxiliary ring 5 together drive all the scraping plates 6 to move upward. At this time, the gap between the scraping plates 6 and the adjacent filter plates 3 is in the maximum state, and the scraping plates 6 do not contact the filter cake during the upward movement.

[0048] During the process of the clamping post 8 driving the extrusion post 12 to move upward, the distance between the extrusion post 12 and the extrusion cylinder 13 gradually decreases, and finally the two come into contact (at this time, the height of the scraper 6 is greater than the height of the filter plate 3). The extrusion post 12 is extruded by the adjacent extrusion cylinder 13, causing the extrusion post 12 to move towards the central axis of the adjacent clamping post 8, compressing the first spring inside the extrusion post 12. The extrusion post 12 loses contact with the adjacent limiting groove 121, and the limiting of the adjacent extrusion post 12 by the limiting groove 121 is released. At this time, during the upward movement, the extrusion post 12 comes into contact with the inclined surface of the adjacent guiding cylinder 14 and moves along the inclined surface of the guiding cylinder 14, causing the extrusion post 12 to rotate around the central axis of the adjacent clamping post 8 while moving upward. The two extrusion posts 12 on the same clamping post 8 respectively drive the auxiliary adjustment shaft 10 and the main adjustment part 11 to rotate. The auxiliary adjustment shaft 10 and the main adjustment part 11 respectively drive the main ring 4 to rotate clockwise and the auxiliary ring 5 to rotate counterclockwise through the gear rack (in this article, Figure 1 the top view is used as the rotation perspective), the main ring 4 drives all the scrapers 6 on the side close to its rotation axis to move closer to the adjacent filter plate 3, and the auxiliary ring 5 drives all the scrapers 6 on the side far from its rotation axis to swing through all the positioning posts 7 on it, making the scraper 6 as a whole move closer to the adjacent filter plate 3. In this way, the gap between the scraper 6 and the adjacent filter plate 3 is reduced. When the gap between the two is equal to the initial thickness, the control terminal controls the telescopic end of the cleaning push rod 9 to contract.

[0049] During the process of the telescopic end of the cleaning push rod 9 contracting, the telescopic end of the cleaning push rod 9 drives the two clamping posts 8 to move downward. The clamping posts 8 drive the main ring 4, the auxiliary ring 5, the auxiliary adjustment shaft 10, the main adjustment part 11 and the extrusion post 12 to move downward together. First, the extrusion post 12 loses contact with the inclined surface of the guiding cylinder 14 and the extrusion cylinder 13 in turn, causing the extrusion post 12 to move away from the central axis of the adjacent clamping post 8 under the action of the first spring inside it. The extrusion post 12 comes into contact with the corresponding limiting groove 121 at this time, and the limiting groove 121 limits the extrusion post 12, making the auxiliary adjustment shaft 10 and the main adjustment part 11 unable to rotate, and further locking the gap between the scraper 6 and the adjacent filter plate 3. As the scraper 6 moves downward, the scraper 6 comes into contact with the filter cake on the surface of the adjacent filter plate 3 and cuts the filter cake from top to bottom, reducing the thickness of the filter cake adhered to the surface of the filter plate 3. When the scraper 6 moves to the lowermost side of the adjacent filter plate 3, the cut part of the filter cake is completely disconnected from the remaining part of the filter cake on the surface of the adjacent filter plate 3. At this time, the control terminal controls the scraper 6 to move upward through the cleaning push rod 9 until the extrusion post 12 comes into contact with the extrusion cylinder 13, and then stops the cleaning push rod 9 and waits for the next excision of the filter cake.

[0050] After scraping off the excess filter cake (i.e., sludge) by the scraper 6, the sludge falls within the main body 1 under the action of gravity and finally accumulates at the lower part of the main body 1 (i.e., the upper side of the piston of the slag discharging member 21). At this time, the control terminal controls the telescopic end of the slag discharging push rod 22 to contract. The telescopic end of the slag discharging push rod 22 drives the slag discharging member 21 to move upward, so that the piston of the slag discharging member 21 moves out of the slag discharging port 102, and the piston of the slag discharging member 21 releases the blockage of the slag discharging port 102. The slag discharging port 102 is communicated with the outside through the micropores of the frustum on the slag discharging member 21, so that a pressure difference is formed between the upper and lower sides of the frustum on the slag discharging member 21, which promotes the sludge accumulated at the slag discharging port 102 to fall to the frustum surface of the slag discharging member 21 through the gap between the piston of the slag discharging member 21 and the main body 1. At this time, the control terminal controls the telescopic end of the slag discharging push rod 22 to extend and drives the slag discharging member 21 to move downward, so that the piston of the slag discharging member 21 blocks the slag discharging port 102 again. At the same time, the frustum of the slag discharging member 21 gradually loses contact with the main body 1. At this time, the sludge located in the middle of the slag discharging member 21 falls out of the main body 1 through the gap between the frustum of the slag discharging member 21 and the main body 1. Subsequently, the control terminal repeatedly repeats the steps of the telescopic end of the slag discharging push rod 22 telescoping, and discharges the sludge in the main body 1 multiple times, reducing the impact on the pressure in the main body 1.

[0051] As the number of times the scraper 6 cuts the filter cake on the filter plate 3 increases, the density of the filter cake that always adheres to the filter plate 3 gradually increases. The control terminal controls the extension distance of the telescopic end of the cleaning push rod 9, so that each time the filter cake is cut, the gap between the scraper 6 and the adjacent filter plate 3 decreases successively. While maintaining the fluid filtration efficiency of the filter cake and the filter plate 3, the excess filter cake is cut off to the greatest extent, reducing the number of times the scraper 6 cuts the filter cake and extending the service life of the device; after the metallurgy is completed, the worker discharges the fluid in the main body 1, opens the cylinder cover, thoroughly cleans the filter plate 3, and at the same time controls the extrusion column 12 and the extrusion cylinder 13 to extrude, and the extrusion column 12 loses contact with the adjacent limiting groove 121, and manually rotates the extrusion column 12 to the initial state (restoring the included angle formed by two adjacent extrusion columns 12), and reversely repeats the above steps of the extrusion column 12 driving the auxiliary adjustment shaft 10 and the main adjustment member 11 to rotate, so that the gap between the scraper 6 and the adjacent filter plate 3 is reset. Subsequently, the worker resets the cylinder cover, controls the telescopic end of the cleaning push rod 9 to contract and reset, and at the same time resets the clamping column 8, the main ring 4, the auxiliary ring 5, the scraper 6, the auxiliary adjustment shaft 10, the main adjustment member 11 and the extrusion column 12.

[0052] See Figures 2-6 and Figure 11, it further includes a shear assembly equal in number to the squeegee 6, which are respectively arranged on adjacent squeegees 6 and used to assist the squeegee 6 in cutting the filter cake. The shear assembly includes: a connecting rod 15, which is slidably connected inside the squeegee 6. A sliding column 16 is fixedly connected to the connecting rod 15. The sliding column 16 is slidably connected to the squeegee 6, and a second spring is fixedly connected between the two; a cutting strip 17, which is fixedly connected to the connecting rod 15 and is in limit sliding connection with the squeegee 6. The squeegee 6 is provided with a number of static teeth 601, and the cutting strip 17 is provided with a number of moving teeth 171; a corrugated cylinder 18, which is fixedly connected to the main body 1. One end of the sliding column 16 far from the adjacent connecting rod 15 contacts the corrugated cylinder 18, and the corrugated cylinder 18 is used to reciprocate the sliding column 16; the static teeth 601 and the moving teeth 171 are respectively located on the lower sides of the adjacent squeegee 6 and the adjacent cutting strip 17.

[0053] In the above solution, it aims to use the reciprocating misaligned movement of the moving teeth 171 and the static teeth 601 to shear the filter cake containing colloid (the filter cake of the leaching solution contains ferric hydroxide colloid), reduce the probability of the filter cake being torn, keep the surface flatness of the filter cake, and thus maintain the filtering effect of the subsequent filter cake on the leaching solution and the purification solution; the end face of the sliding column 16 is hemispherical, which is used to reduce the friction when the sliding column 16 slides along the corrugated cylinder 18; the inner side surface of the corrugated cylinder 18 is corrugated, which is used to reciprocate the sliding column 16 when the sliding column 16 slides along the inner side surface of the corrugated cylinder 18; the static teeth 601 and the moving teeth 171 are respectively located on the lower sides of the adjacent squeegee 6 and the adjacent cutting strip 17, which is used to make the squeegee 6 cut the filter cake from top to bottom, reduce the contact between the cut filter cake and the residual filter cake on the filter plate 3, and keep the integrity of the residual filter cake on the filter plate 3.

[0054] The working principle of the above solution is as follows: when the squeegee 6 moves, the squeegee 6 drives the connecting rod 15, the sliding column 16 and the cutting strip 17 to move together. During this process, the sliding column 16 slides along the corrugated surface inside the corrugated cylinder 18, so that the sliding column 16 is reciprocally extruded. The sliding column 16 drives the cutting strip 17 to move back and forth through the connecting rod 15, and reciprocally compresses the second spring of the sliding column 16, so that the moving teeth 171 on the cutting strip 17 and the static teeth 601 on the adjacent squeegee 6 are reciprocally misaligned and then reset. The reciprocating misaligned movement of the moving teeth 171 and the static teeth 601 is used to shear the filter cake, reduce the probability of the surface of the filter cake being uneven caused by directly scraping the filter cake, and maintain the effect of the residual filter cake on the filter plate 3 for solid-liquid separation of the fluid.

[0055] See Figure 2 , Figure 4 , Figure 5 and Figure 12 , a guiding shell 19 is fixedly connected to the side of the squeegee 6 far from the adjacent filter plate 3. The guiding shell 19 is used to change the moving track of the cut part of the filter cake; a shunt member 20 is fixedly connected to the main body 1 near the feed port 101. The shunt member 20 is used to disperse the fluid entering the main body 1 from the feed port 101.

[0056] In the above solution, it is intended to use the guiding shell 19 to guide the filter cake cut by the scraper 6, so that the cut filter cake moves downward following the scraper 6, reducing the probability that the cut filter cake continues to block the remaining filter cake on the filter plate 3 under the action of the pressure difference, quickly restoring the difficulty for the liquid component to pass through the filter cake on the filter plate 3 to the initial state, and maintaining the solid-liquid separation efficiency of the device for the fluid; using the flow divider 20 to divide the fluid transported into the main body 1, reducing the impact of the fluid flow on the sludge accumulated in the main body 1, maintaining the stability of the sludge accumulated in the main body 1, reducing the influence of the sludge in the main body 1 on the turbidity of the fluid in the main body 1, and thus maintaining the solid-liquid separation efficiency of the device for the fluid; one side of the guiding shell 19 is fixedly connected to the side of the scraper 6 away from the adjacent filter plate 3, for changing the moving direction of the filter cake cut by the scraper 6; the flow divider 20 is composed of a cylinder and a frustum-shaped cylinder, wherein only the side of the cylinder of the flow divider 20 close to the feed port 101 is fixedly connected to the main body 1, and there are gaps between the rest of the circumferential positions of the main body 1, and this gap enables the sludge falling between the flow divider 20 and the main body 1 to fall smoothly and accumulate at the lower part of the main body 1.

[0057] The working principle of the above solution is as follows: when the scraper 6 moves downward to cut the filter cake, the scraper 6 drives the adjacent guiding shell 19 to move downward together. The filter cake cut by the scraper 6 moves along the side of the scraper 6 and the cutting strip 17 away from the adjacent filter plate 3 into the guiding shell 19 and slides along the inner side surface of the guiding shell 19. The guiding shell 19 guides the cut filter cake to move downward, so that the cut filter cake moves directly downward, reducing the probability that the cut filter cake stacks between two adjacent filter plates 3 and at the same time reducing the probability that the cut filter cake reattaches to the surface of the remaining filter cake on the filter plate 3 under the action of the fluid flow.

[0058] When the fluid enters the main body 1 through the feed port 101, the fluid is first located between the main body 1 and the flow divider 20 and finally flows to the rest of the positions in the main body 1 along the gaps between the upper and lower sides of the flow divider 20 and the main body 1. In this way, the flow of the fluid in the main body 1 always adheres to its inner wall, reducing the influence of the fluid flow in the main body 1 on the falling of the filter cake and the accumulated sludge.

[0059] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly illustrating the present application and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present application type.

Claims

1. A filter for hydrometallurgy of zinc, characterized in that: include: A main body (1), the main body (1) being provided with a feed port (101), a slag discharge port (102) being provided at the lower side of the main body (1), the main body (1) being fixedly connected with a liquid discharge pipe (2), the liquid discharge pipe (2) passing through the main body (1) and being fixedly connected with a plurality of filter plates (3) located in the main body (1) and distributed at equal intervals, the filter plates (3) being in communication with the liquid discharge pipe (2); A main ring (4) is arranged in the main body (1); a secondary ring (5) is arranged in the main body (1) at a position close to the main ring (4); scrapers (6) are arranged on both sides of the filter plate (3) and are rotatably connected to the main ring (4); the scrapers (6) are slidably connected to the secondary ring (5); the scrapers (6) are slidably connected to the main ring (4); the scrapers (6) are slidably connected to a positioning column (7) slidably connected to the main ring (4); the positioning column (7) is rotatably connected to the secondary ring (5); the scrapers (6) are used to thin the filter cake adhered to the surface of the adjacent filter plate (3); The main body (1) is sealingly and slidably connected with two clamping columns (8), both of which pass through the main body (1) and are in contact with the main ring (4) and the secondary ring (5), and the clamping columns (8) are used to drive the main ring (4) and the secondary ring (5) to move. The main body (1) is equipped with a cleaning push rod (9), and the telescopic end of the cleaning push rod (9) is fixedly connected to one end of the two clamping columns (8) away from the main ring (4).

2. The filter for hydrometallurgy of zinc according to claim 1, characterized in that: A secondary adjustment shaft (10) is rotatably connected in the clamping column (8) at a position close to the main ring (4), and the secondary adjustment shaft (10) and the secondary ring (5) are driven by a gear rack. A main adjustment member (11) rotatably connected to the secondary adjustment shaft (10) is rotatably connected in the clamping column (8), and the main adjustment member (11) and the main ring (4) are driven by a gear rack.

3. The filter for hydrometallurgy of zinc according to claim 2, characterized in that: The auxiliary adjustment shaft (10) and the main adjustment member (11) are both slidably connected to a squeeze column (12) on one side away from the main ring (4); a first spring is fixedly connected between the auxiliary adjustment shaft (10) and the main adjustment member (11) and adjacent squeeze columns (12) respectively; a plurality of limiting grooves (121) are provided in the clamping column (8) at a position close to the auxiliary adjustment shaft (10); the limiting grooves (121) are used to limit adjacent squeeze columns (12).

4. The filter for hydrometallurgy of zinc according to claim 3, characterized in that: Two extrusion cylinders (13) are fixedly connected in the main body (1) at a position away from the main ring (4). The extrusion cylinders (13) are used to extrude two adjacent extrusion cylinders (12) on adjacent clamping columns (8) and release the limiting relationship between the extrusion cylinders (12) and the adjacent limiting grooves (121). A guide cylinder (14) is fixedly connected in the extrusion cylinder (13). The guide cylinder (14) is used to extrude two adjacent extrusion cylinders (12) on adjacent clamping columns (8) and rotate the auxiliary adjustment shaft (10) and the main adjustment member (11).

5. The filter for hydrometallurgy of zinc according to claim 4, characterized in that: It also comprises shearing assemblies, the number of which is equal to that of the scrapers (6), which are respectively arranged on adjacent scrapers (6) and are used to assist the scrapers (6) in cutting the filter cake. The shearing assemblies comprise: A connecting rod (15) is slidably connected inside the scraper (6); the connecting rod (15) is fixedly connected to a sliding column (16); the sliding column (16) is slidably connected to the scraper (6); and a second spring is fixedly connected between the sliding column (16) and the scraper (6); A cutting strip (17) is fixedly connected to the connecting rod (15) and is slidably connected to the scraper (6) in a limited position, the scraper (6) is provided with a plurality of stationary teeth (601), and the cutting strip (17) is provided with a plurality of movable teeth (171); The wave cylinder (18) is fixedly connected in the main body (1); one end of the sliding column (16) away from the adjacent connecting rod (15) contacts the wave cylinder (18); and the wave cylinder (18) is used to cause the sliding column (16) to reciprocate.

6. The filter for hydrometallurgy of zinc according to claim 5, characterized in that: The stationary teeth (601) and the movable teeth (171) are respectively located on the lower side of the adjacent scraper (6) and the adjacent cutting strip (17).

7. The filter for hydrometallurgy of zinc according to claim 5, characterized in that: A guide shell (19) is fixedly connected to one side of the scraper (6) away from the adjacent filter plate (3), and the guide shell (19) is used to change the movement trajectory of the removed portion of the filter cake.

8. The filter for hydrometallurgy of zinc according to claim 5, characterized in that include: The flow divider (20) is fixedly connected to a position in the main body (1) close to the feed inlet (101), and the flow divider (20) is used to disperse the fluid entering the main body (1) from the feed inlet (101).

9. The filter for hydrometallurgy of zinc according to claim 8, characterized in that: A slag discharge piece (21) is sealingly and slidably connected inside the slag discharge port (102), a slag discharge push rod (22) is installed on the main body (1), and a telescopic end of the slag discharge push rod (22) is fixedly connected to the slag discharge piece (21).

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