Sodium aluminate solution desiliconization equipment

Abstract

The invention provides sodium aluminate solution desiliconization equipment, and relates to the technical field of sodium aluminate solution desiliconization. An electrode plate and a supporting rod are arranged in the shell, a liquid inlet pipe and a liquid outlet pipe are arranged on the shell, a sewage discharging system is arranged at the bottom of the shell and comprises a sewage discharging box communicated with the side portion of the shell, a filtering box is communicated with the bottom of the sewage discharging box, and a sealing block is arranged at the top of the filtering box in a lifting mode and can seal the filtering box and the sewage discharging box. A filter screen is wound on the winding roller, a sliding block is arranged at the end part of the filter screen, a sliding rail which is in sliding connection with the sliding block is arranged on the side walls of the shell and the pollution discharge box, one end of the sliding rail is positioned at the position, close to the shell, of the winding roller, and the other end of the sliding rail is positioned at the position, away from the shell, of the top of the pollution discharge box; a first wire wheel is rotationally arranged in the end, located at the top of the sewage discharging box, of the sliding rail, and a first pull wire connected with the sliding block is wound on the first wire wheel. The sewage discharging efficiency is high, the filter screen is used for capturing and transferring sewage, and the blocking phenomenon is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of desilication of sodium aluminate solution, and particularly relates to a desilication device for sodium aluminate solution. Background Art

[0002] During the production of alumina by the Bayer process, the silicon-containing impurities in bauxite dissolve and enter the solution in the form of silicate or aluminosilicate. After multiple cycles, the silicon impurities in the sodium aluminate solution gradually accumulate, and the concentration of SiO2 becomes higher and higher. The silicon-containing impurities not only cause the loss of alumina and sodium oxide, but also precipitate simultaneously with aluminum hydroxide during the decomposition process, affecting the quality and whiteness of the product, and also restricting its application in the field of producing high-quality aluminum-based products. Controlling the silicon content in the sodium aluminate solution is crucial for the production of high-quality alumina.

[0003] In the prior art, when desilicating a high-concentration sodium aluminate solution, a desilication agent can be added first for one-stage desilication, and then electrocoagulation desilication is carried out. Currently, the sludge discharging method at the bottom of the electrocoagulation reactor is generally gravity sludge discharging. The bottom conical design makes the sediment slide towards the sludge discharging port at the cone bottom. This sludge discharging method not only has a slow sludge discharging speed, but most importantly, it is easy to be blocked. Summary of the Invention

[0004] The purpose of the present invention is to develop a desilication device for sodium aluminate solution with high sewage discharge efficiency, which can capture dirt by using a filter screen and transfer it without blockage.

[0005] The present invention is achieved through the following technical solutions:

[0006] A desilication device for sodium aluminate solution, comprising:

[0007] A housing;

[0008] A plurality of electrode plates, arranged in the housing;

[0009] A support rod, connected to the tops of the plurality of electrode plates and connected to the housing;

[0010] An inlet pipe and an outlet pipe, arranged on opposite side walls of the housing;

[0011] A sewage discharge system, arranged at the bottom of the housing, comprising:

[0012] A sewage discharge box, communicated with the side of the housing;

[0013] A filter box, communicated with the bottom of the sewage discharge box;

[0014] A sealing block, arranged at the top of the filter box in a liftable manner, capable of blocking the filter box and the sewage discharge box;

[0015] Wherein, a winding roller is elastically rotatably arranged at the bottom of the sewage discharge box near the housing, a filter screen is wound on the winding roller, and a slider is arranged at the end of the filter screen;

[0016] The side walls of the housing and the sewage discharge tank are provided with slide rails that are slidably connected to the slider. One end of the slide rail is located near the housing of the winding roller, and the other end of the slide rail is located at the top of the sewage discharge tank far from the housing. The slide rail extends from the bottom of the sewage discharge tank into the housing and then turns upward and extends into the sewage discharge tank. A slidable sealing door is provided at the connection between the sewage discharge tank and the housing;

[0017] A first wire wheel is rotatably provided inside the end of the slide rail at the top of the sewage discharge tank. A motor is provided on the sewage discharge tank and is in transmission connection with the first wire wheel. A first wire rope connected to the slider is wound on the first wire wheel.

[0018] Optionally, the slide rail sequentially includes a lower section, a first turning section, an upper section, and a second turning section. The lower section extends horizontally from the side of the winding roller into the housing. The lower section is at the bottom of the side walls of the housing and the sewage discharge tank. The lower section extends to the side wall of the housing far from the sewage discharge tank and is connected to the first turning section. The first turning section is in a semi-circular arc shape. The bottom end of the first turning section is connected to the lower section, and the top end of the first turning section is connected to the upper section. The upper section is horizontally arranged above the lower section. The upper section extends horizontally into the sewage discharge tank to the inside of the sewage discharge tank. The upper section in the sewage discharge tank is at the top of the side wall of the sewage discharge tank. One end of the upper section far from the first turning section is connected to the second turning section. The second turning section is in an arc shape arranged downward.

[0019] Optionally, a second wire wheel is rotatably provided at the end of the lower section of the slide rail near the winding roller. The second wire wheel is located inside the sewage discharge tank. A second wire rope connected to the slider is wound on the second wire wheel. The second wire wheel rotates elastically or is driven by a motor.

[0020] Optionally, the slider is strip-shaped and is arranged along the edge of the filter screen. The side wall of the slider away from the filter screen is conical.

[0021] Optionally, the sealing block is conical and the conical part is vertically upward. A ring of support rings is provided on the bottom edge of the side wall of the sealing block. A layer of sealing cushion is provided on the top of the support rings. A ring of steps matching the support rings is provided on the edge of the top opening of the filter tank in the lifting direction of the support rings.

[0022] Optionally, a support plate is provided inside the filter tank. A plurality of support rods connecting the bottom of the support plate to the bottom of the filter tank are provided at the bottom of the support plate. A hydraulic cylinder vertically arranged and connected to the sealing block is provided on the top of the support plate.

[0023] Optionally, the support plate is horizontally arranged and is located in the middle of the filter tank. A ring of cylindrical filter plates is provided on the edge of the support plate. The outer shape of the filter plates corresponds to that of the support plate. A liquid return pipe is provided at the bottom of the filter tank in the inner area of the filter plates. The liquid return pipe is connected to the liquid inlet pipe. A pump is provided on the liquid return pipe;

[0024] A plurality of cleaning ports are provided at the bottom of the filter box in the outer region of the filter plate, and a sewage discharge door that can be opened and closed is provided in the cleaning port.

[0025] Optionally, a plurality of plate grooves surrounding the filter plate are provided on the inner wall of the filter box. The plate grooves are vertically opened on the inner wall of the filter box. A pressing plate is hinged in the plate groove. The bottom end of the pressing plate is hinged to the bottom of the plate groove. A driving hydraulic cylinder is rotatably connected to the inner side of the plate groove. The piston rod of the driving hydraulic cylinder is hinged to the top of the pressing plate.

[0026] Optionally, a chute is provided in the inner wall of the housing at the top of the connection between the sewage discharge box and the housing. The chute is vertically arranged. The sealing door is slidably arranged in the chute. A cylinder for driving the sealing door to lift is provided in the chute at the top of the sealing door.

[0027] Optionally, an air intake system is provided in the housing below the electrode plate. The air intake system includes a plurality of rectangular air intake frames. The plurality of air intake frames are arranged in sequence from the inside to the outside and their sizes gradually increase. A plurality of air pipes are connected between the plurality of air intake frames. A plurality of air pipes connected to the housing are connected to the outermost air intake frame. The air pipes are connected to an external air source. A plurality of air nozzles are provided at the top of the air intake frame. The plurality of air nozzles are equidistantly arranged on the track of the air intake frame where they are located.

[0028] The beneficial effects of the present invention are:

[0029] The present invention can regularly and automatically clean the sediment generated by the electrocoagulation reaction, move the sediment out from below the electrode plate and automatically filter it. The filtered liquid flows back to the inlet pipe. The sediment is automatically compacted and stored in the filter box after filtration and can be cleaned regularly. The slider drives the filter screen to capture the sediment and push it into the sewage discharge box. The side wall of the slider is conical and can shovel up the sediment attached to the bottom of the housing. This not only avoids the sediment from adhering to the bottom of the housing, but also does not cause blockage. A large amount of sediment at the bottom of the housing can be captured at one time, with a high sewage discharge volume and a high sewage discharge efficiency. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a structural diagram of the present invention;

[0032] Figure 2 It is a structural diagram of the air intake system;

[0033] Figure 3 ForFigure 1 Enlarged view of area A in [the figure];

[0034] Figure 4 is Figure 1 Enlarged view of area B in [the figure].

[0035] Reference numerals: 1, housing; 2, liquid inlet pipe; 3, liquid outlet pipe; 4, electrode plate; 5, support rod; 6, air intake system; 61, air intake frame; 62, air nozzle; 63, air pipe; 64, gas transmission pipe; 7, sealing door; 8, sewage discharge tank; 81, step; 9, filter tank; 10, liquid return pipe; 11, sealing block; 111, support ring; 12, slide rail; 121, lower section; 122, first turning section; 123, upper section; 124, second turning section; 13, winding roller; 14, support plate; 15, filter plate; 16, pressing plate; 17, driving hydraulic cylinder; 18, sewage discharge door; 19, filter screen; 20, slider; 21, second wire wheel; 22, first wire wheel; 23, sealing cushion layer. Detailed implementation manners

[0036] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0039] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0040] As Figures 1 to 4As shown in the figure, the present invention discloses a desilication device for sodium aluminate solution, which includes a cuboid-shaped housing 1. Liquid inlet pipes 2 and liquid outlet pipes 3 are respectively connected to two opposite side walls of the housing 1. The liquid inlet pipe 2 is located at the bottom of the side wall of the housing 1, and the liquid outlet pipe 3 is located in the middle of the side wall of the housing 1.

[0041] A plurality of vertically arranged electrode plates 4 are provided inside the housing 1. A horizontally arranged support rod 5 is provided at the top of the electrode plate 4. The support rod 5 is connected to the electrode plate 4 to fix it. A circuit electrically connected to the electrode plate 4 is provided inside the support rod 5, and the circuit is electrically connected to an external power source.

[0042] An air inlet system 6 is provided in the housing 1 below the lower part of the electrode plate 4. The air inlet system 6 conveys air bubbles into the housing 1 to achieve the effect of stirring the solution, and the rising air bubbles can also make some flocs or impurities float to the liquid surface for separation.

[0043] The air inlet system 6 includes a plurality of rectangular air inlet frames 61. The plurality of air inlet frames 61 are arranged in sequence from inside to outside and their sizes gradually increase. A plurality of air pipes 63 are connected between the plurality of air inlet frames 61. A plurality of air delivery pipes 64 connected to the housing 1 are connected to the outermost air inlet frame 61, and the air delivery pipes 64 are connected to an external air source. A plurality of air nozzles 62 are provided at the top of the air inlet frame 61, and the plurality of air nozzles 62 are arranged at equal intervals on the track of the air inlet frame 61 where they are located.

[0044] A sewage discharge system is provided below the air inlet system 6. The sewage discharge system periodically and automatically shovels out the sediment at the bottom of the housing 1 for cleaning. The scum on the top of the liquid level inside the housing 1 can be discharged by means of mechanical scum scraping or overflow slag discharge, etc., which will not be elaborated here.

[0045] The sewage discharge system includes a sewage discharge box 8 provided on one side of the bottom of the housing 1. The sewage discharge box 8 is connected to the bottom of the housing 1. A slidable sealing door 7 is provided at the connection between the sewage discharge box 8 and the housing 1. A chute is provided in the inner wall of the housing 1 at the top of the connection between the sewage discharge box 8 and the housing 1. The chute is vertically arranged. The sealing door 7 is slidably arranged in the chute. A cylinder for driving the sealing door 7 to lift is provided in the chute at the top of the sealing door 7. When the sealing door 7 slides down out of the chute until the bottom contacts the bottom of the housing 1, the sealing door 7 blocks the connection between the sewage discharge box 8 and the housing 1. When the sealing door 7 slides up into the chute, the sewage discharge box 8 can be connected to the housing 1.

[0046] A winding roller 13 is rotatably provided at the bottom of the sewage discharge box 8. The winding roller 13 rotates elastically, and a torsion spring is provided between the winding roller 13 and the sewage discharge box 8. The winding roller 13 is located near the sealing door 7. A flexible filter screen 19 is wound on the winding roller 13. The winding roller 13 is horizontally arranged along the width direction of the housing 1, and the width of the filter screen 19 wound on the winding roller 13 is adapted to the width of the housing 1.

[0047] The end of the filter screen 19 on the rewinding roller 13 is provided with strip-shaped sliders 20. The sliders 20 are arranged along the edge of the filter screen 19, and the side wall of the slider 20 away from the filter screen 19 is conical. On the side walls of the housing 1 and the sewage discharge tank 8 at both ends of the slider 20, there are slide rails 12. The two ends of the slider 20 are slidably connected to the slide rails 12. The slide rails 12 are concave in the side walls of the housing 1 and the sewage discharge tank 8, and the slide rails 12 will not hinder the sliding of the sealing door 7. When the sealing door 7 is closed, a small amount of liquid will pass through the gap between the slide rail 12 and the sealing door 7 and flow into the sewage discharge tank 8, which does not prevent the sewage discharge operation of the sewage discharge tank 8.

[0048] The slide rail 12 sequentially includes a lower section 121, a first turning section 122, an upper section 123 and a second turning section 124. The lower section 121 extends horizontally from the side of the rewinding roller 13 into the housing 1. The lower section 121 is at the bottom of the side walls of the housing 1 and the sewage discharge tank 8. The lower section 121 extends to the side wall of the housing 1 away from the sewage discharge tank 8 and is connected to the first turning section 122. The first turning section 122 is in a semi-circular arc shape. The bottom end of the first turning section 122 is connected to the lower section 121, and the top end of the first turning section 122 is connected to the upper section 123. The upper section 123 is horizontally arranged above the lower section 121. The upper section 123 extends horizontally into the sewage discharge tank 8 to the inside of the sewage discharge tank 8. The upper section 123 in the sewage discharge tank 8 is at the top of the side wall of the sewage discharge tank 8. The end of the upper section 123 away from the first turning section 122 is connected to the second turning section 124. The second turning section 124 is in an arc shape arranged downward.

[0049] A first wire wheel 22 is rotatably arranged at the bottom end of the second turning section 124. A transmission rod is coaxially connected between the first wire wheels 22 at the bottom ends of the second turning sections 124 of the two slide rails 12. Through the transmission rod, the first wire wheels 22 in the two slide rails 12 rotate synchronously. A motor is provided on the sewage discharge tank 8 on the side of one of the first wire wheels 22 and is in transmission connection with it.

[0050] A first pull wire is wound on the first wire wheel 22. The first pull wire is arranged in the slide rail 12 and is connected to the slider 20 in the slide rail 12. Since a torsion spring is connected to the rewinding roller 13 to make it elastically rotate, the elastic rotation of the rewinding roller 13 makes the filter screen 19 remain wound so that the filter screen 19 and the first pull wire are kept taut. When the first wire wheel 22 rotates to wind the first pull wire, the first pull wire pulls the slider 20 to make it slide in the slide rail 12. When the slider 20 slides in the slide rail 12 and the first wire wheel 22 rotates to unwind the first pull wire, the elastic rotation of the rewinding roller 13 makes the filter screen 19 be wound and the first pull wire remains taut in the slide rail 12.

[0051] A second wire wheel 21 is rotatably provided at the end of the lower section 121 of the slide rail 12 close to the winding roller 13. The second wire wheel 21 is located inside the sewage discharge tank 8. A transmission rod is coaxially connected between the second wire wheels 21 at the ends of the lower sections 121 of the two slide rails 12, so that the two second wire wheels 21 rotate synchronously. A torsion spring is also connected between the second wire wheel 21 and the side wall of the housing 1 where it is located, so that the second wire wheel 21 rotates elastically. A second pull wire is wound around the second wire wheel 21. The second pull wire is located inside the slide rail 12 and is connected to the end of the slider 20 inside the slide rail 12. The elastic rotation of the second wire wheel 21 has a tendency to wind up the second pull wire. The elastic force of the torsion spring on the second wire wheel 21 is greater than the elastic force of the winding roller 13. The elastic force of the winding roller 13 is mainly used to tension the filter screen 19 or wind up the filter screen 19. The elastic force of the second wire wheel 21 causes the slider 20 to slide downward in the slide rail 12 towards the end close to the winding roller 13. The second wire wheel 21 can also be driven to rotate by a motor connected to it for winding and unwinding the second pull wire, which can be selected according to the size of the housing 1 and the sewage discharge tank 8, that is, the length of the slide rail 12. If the slide rail 12 is long, the motor is used to drive the second wire wheel 21 to rotate. If the slide rail 12 is short, the torsion spring can be used to drive the second wire wheel 21 to rotate elastically.

[0052] A filter tank 9 is provided at the bottom of the sewage discharge tank 8. The top of the filter tank 9 is communicated with the bottom of the sewage discharge tank 8 inside the winding roller 13. A liftable sealing block 11 is provided at the top of the filter tank 9. The sealing block 11 is conical with the conical part facing vertically upward. A ring of support rings 111 is provided at the bottom edge of the side wall of the sealing block 11. A layer of sealing cushion 23 is provided at the top of the support rings 111. A ring of steps 81 matching the support rings 111 is provided at the edge of the top opening of the filter tank 9 in the lifting direction of the support rings 111. The steps 81 protrude from the side wall of the top opening of the filter tank 9. When the sealing block 11 rises, the support rings 111 can rise and be in close contact with the steps 81, so that the sealing block 11 seals the space between the sewage discharge tank 8 and the filter tank 9.

[0053] The bottom of the sealing block 11 is connected to a vertically arranged hydraulic cylinder. The bottom of the hydraulic cylinder is provided with a horizontally arranged support plate 14. The support plate 14 is located in the middle of the filter tank 9. The bottom of the support plate 14 is provided with a plurality of support rods connected to the bottom of the filter tank 9. A cylindrical rigid filter plate 15 is provided at the edge of the support plate 14. The shape of the filter plate 15 corresponds to that of the support plate 14. When the support plate 14 is rectangular or polygonal, the filter plate 15 is correspondingly prismatic. When the support plate 14 is circular, the filter plate 15 is correspondingly cylindrical. The bottom of the filter plate 15 is connected to the bottom of the filter tank 9. The inner space and the outer space of the columnar structure formed by the filter plate 15 and the support plate 14 are separated. The liquid outside can pass through the filter plate 15 and enter its inner space, while the sediment is blocked outside by the filter plate 15.

[0054] At the bottom of the filtration tank 9 in the inner area of the filter plate 15, there is a liquid return pipe 10, which is connected to the liquid inlet pipe 2, and a pump is provided on the liquid return pipe 10. A plurality of plate grooves surrounding the filter plate 15 are provided on the inner wall of the filtration tank 9. The plate grooves are vertically opened on the inner wall of the filtration tank 9. A pressing plate 16 is hinged in the plate groove. The bottom end of the pressing plate 16 is hinged to the bottom of the plate groove. A driving hydraulic cylinder 17 is rotatably connected to the inner side of the plate groove. The piston rod of the driving hydraulic cylinder 17 is hinged to the top of the pressing plate 16. When the driving hydraulic cylinder 17 extends, it can push the pressing plate 16 to turn into the filtration tank 9 around its bottom end. When the driving hydraulic cylinder 17 shortens, it can pull the pressing plate 16 to swing into the plate groove around its bottom end for resetting. A plurality of cleaning ports are provided at the bottom of the filtration tank 9 in the outer area of the filter plate 15, and a sewage discharge door 18 that can be opened and closed is provided in the cleaning ports.

[0055] The sodium aluminate solution treated with the desilication agent enters the shell 1 through the liquid inlet pipe 2 for electrocoagulation reaction. The bubbles ejected from the multiple air nozzles 62 of the air intake system 6 rush into the sodium aluminate solution in the shell 1 to stir the sodium aluminate solution. The rising bubbles cause some flocs or impurities to float to the liquid surface for separation. Most of the flocs and impurities settle at the bottom of the shell 1. The sodium aluminate solution output by the liquid outlet pipe 3 is filtered to obtain an ultra-low silicon sodium aluminate solution.

[0056] The sewage disposal system operates regularly to automatically clean the sediment at the bottom of the housing 1. During the cleaning process, the first wire wheel 22 slowly rotates to wind up the first wire rope. The first wire rope pulls the slider 20 to slide slowly. The slider 20 starts to slide from the end of the slide rail 12 close to the winding roller 13. The sliding of the slider 20 drives the filter screen 19 to slide. At the same time, the winding roller 13 releases the filter screen 19, and the second wire wheel 21 releases the second wire rope. When the slider 20 slides on the lower section 121 of the slide rail 12, it shovels up the sediment attached to the bottom of the housing 1. After the slider 20 slides to the first turning section 122, the slider 20 slides upward along the first turning section 122 by a certain height and then slowly slides into the sewage disposal tank 8 from the upper section 123. When the slider 20 slides into the top of the sewage disposal tank 8 from the upper section 123, all the sediment on the filter screen 19 enters the sewage disposal tank 8. At this time, the sealing door 7 slides down to block the connection between the sewage disposal tank 8 and the housing 1. At the same time, the slider 20 continues to be pulled by the first wire rope to slide in the slide rail 12 until it slides to the end of the second turning section 124. At this time, the side of the filter screen 19 carrying the sediment faces downward, and the sediment in the housing 1 is below the filter screen 19 in the sewage disposal tank 8. Then, the hydraulic cylinder at the bottom of the sealing block 11 drives the sealing block 11 to slide down. The sliding down of the sealing block 11 causes the liquid and sediment in the sewage disposal tank 8 to flow out from the edge of the sealing block 11. During this process, the gravity of the liquid drives all the sediment to flow into the lower filter tank 9. The conical shape of the sealing block 11 prevents sediment from remaining on the sealing block 11. After all the sediment and liquid in the sewage disposal tank 8 enter the filter tank 9, the hydraulic cylinder drives the sealing block 11 to rise to block the bottom of the sewage disposal tank 8. Then, the sealing door 7 rises to connect the sewage disposal tank 8 and the housing 1. During the opening process of the sealing door 7, the liquid at the bottom of the housing 1 fills the sewage disposal tank 8. After the sealing door 7 is opened, the first wire wheel 22 rotates to unwind the wire rope. Under the elastic force of the torsion springs of the winding roller 13 and the second wire wheel 21, the second wire rope pulls the slider 20 to slide in the slide rail 12 towards the end of the lower section 121 close to the winding roller 13 until the slider 20 slides to the end of the lower section 121 close to the winding roller 13. At the same time, the winding roller 13 winds up the filter screen 19, waiting for the next operation of transferring the sediment at the bottom of the housing 1 to the sewage disposal tank 8. The liquid and sediment entering the filter tank 9 are outside the filter plate 15. Under the action of gravity, the liquid penetrates through the filter plate 15 and flows into the return liquid pipe 10. The pump machine pumps the liquid into the inlet pipe 2 for reflux so that the liquid re-enters the housing 1 for electrocoagulation reaction. After the filter tank 9 filters for a period of time, the driving hydraulic cylinder 17 drives the pressing plate 16 to rotate to squeeze the sediment outside the filter plate 15, so that the remaining liquid in the sediment is squeezed out and penetrates through the filter plate 15 and flows into the return liquid pipe 10, and the volume of the sediment is compressed, so that the filter tank 9 can accommodate more sediment. The sediment in the filter tank 9 can be regularly cleared through the sewage discharge door 18.

[0057] The present invention can regularly and automatically clean the sediment generated by the electrocoagulation reaction, remove the sediment from the lower part of the electrode plate 4 and automatically filter it. The filtered liquid flows back to the inlet pipe 2. After the sediment is filtered, it is automatically compacted and stored in the filter box 9 and can be regularly cleaned. The slider 20 drives the filter screen 19 to capture the sediment and push it into the sewage discharge box 8. The side wall of the slider 20 is conical to shovel up the sediment attached to the bottom of the housing 1, which not only avoids the sediment adhering to the bottom of the housing 1, but also does not cause blockage. A large amount of sediment at the bottom of the housing 1 can be captured at one time, with a high sewage discharge volume and a high sewage discharge efficiency.

[0058] The above embodiments are only the preferred embodiments of the present invention and do not limit the technical solutions of the present invention. As long as the technical solutions can be achieved on the basis of the above embodiments without creative labor, they shall be regarded as falling within the scope of the patent rights of the present invention.

Claims

1. A sodium aluminate solution desilication device, characterized in that, Comprising: A housing; A plurality of electrode plates disposed in the housing; Support rods connected to the tops of the plurality of electrode plates and connected to the housing; An inlet pipe and an outlet pipe disposed on opposite side walls of the housing; A sewage disposal system disposed at the bottom of the housing, including: A sewage disposal tank communicated with the side of the housing; A filtration tank communicated with the bottom of the sewage disposal tank; A sealing block disposed at the top of the filtration tank in a liftable manner and capable of sealing the space between the filtration tank and the sewage disposal tank; Wherein, a winding roller is elastically rotatably disposed at the bottom of the sewage disposal tank near the housing, a filter screen is wound on the winding roller, and a slider is provided at the end of the filter screen; Sliding rails are provided on the side walls of the housing and the sewage disposal tank and are slidably connected to the slider. One end of the sliding rail is located near the housing of the winding roller, and the other end of the sliding rail is located at the top of the sewage disposal tank far from the housing. The sliding rail extends from the bottom of the sewage disposal tank into the housing, then turns upward and extends into the sewage disposal tank. A slidable sealing door is provided at the connection between the sewage disposal tank and the housing; A first wire wheel is rotatably disposed in the end of the sliding rail at the top of the sewage disposal tank. A motor is provided on the sewage disposal tank and is drivingly connected to the first wire wheel. A first wire cable connected to the slider is wound on the first wire wheel.

2. The sodium aluminate solution desilication device according to claim 1, characterized in that The sliding rail sequentially includes a lower section, a first turning section, an upper section, and a second turning section. The lower section horizontally extends from the side of the winding roller into the housing. The lower section is at the bottom of the side walls of the housing and the sewage disposal tank. The lower section extends to the side wall of the housing far from the sewage disposal tank and is communicated with the first turning section. The first turning section is in a semi-circular arc shape. The bottom end of the first turning section is communicated with the lower section, and the top end of the first turning section is communicated with the upper section. The upper section is horizontally disposed above the lower section and horizontally extends into the sewage disposal tank to the inside of the sewage disposal tank. The upper section in the sewage disposal tank is at the top of the side wall of the sewage disposal tank. One end of the upper section far from the first turning section is communicated with the second turning section, and the second turning section is in a downward arc shape.

3. The sodium aluminate solution desilication equipment according to claim 2, characterized in that, A second wire wheel is rotatably disposed at the end of the lower section of the sliding rail near the winding roller. The second wire wheel is located in the sewage disposal tank. A second wire cable connected to the slider is wound on the second wire wheel. The second wire wheel is elastically rotatable or driven by a motor.

4. The sodium aluminate solution desilication device according to claim 2, characterized in that, The slider is strip-shaped and disposed along the edge of the filter screen. The side wall of the slider away from the filter screen is conical.

5. The sodium aluminate solution desilication equipment according to claim 1, characterized in that, The sealing block is conical with the conical part vertically upward. A support ring is provided on the bottom edge of the side wall of the sealing block. A sealing cushion layer is provided on the top of the support ring. A step matching the support ring is provided on the edge of the top opening of the filtration tank in the lifting direction of the support ring.

6. The sodium aluminate solution desilication device according to claim 5, characterized in that, A support plate is provided in the filtration tank. A plurality of support rods connected to the bottom of the filtration tank are provided at the bottom of the support plate. A hydraulic cylinder vertically arranged and connected to the sealing block is provided at the top of the support plate.

7. The sodium aluminate solution desilication device according to claim 6, characterized in that, The support plate is horizontally arranged and located in the middle of the filtration tank. A cylindrical filter plate is provided on the edge of the support plate. The outer shape of the filter plate corresponds to that of the support plate. A return pipe is provided at the bottom of the filtration tank in the inner area of the filter plate and is communicated with the inlet pipe. A pump is provided on the return pipe; A plurality of sewage cleaning ports are provided at the bottom of the filtration tank in the outer area of the filter plate. A sewage discharge door capable of being opened and closed is provided in the sewage cleaning port.

8. The sodium aluminate solution desilication device according to claim 7, characterized in that, A plurality of plate grooves are provided on the inner wall of the filtering box and are arranged around the filter plate. The plate grooves are vertically opened on the inner wall of the filtering box. A pressing plate is hinged in the plate groove. The bottom end of the pressing plate is hinged to the bottom of the plate groove. A driving hydraulic cylinder is rotatably connected to the inner side of the plate groove. The piston rod of the driving hydraulic cylinder is hinged to the top of the pressing plate.

9. The sodium aluminate solution desilication device according to claim 1, wherein A chute is provided in the inner wall of the housing at the top of the connection between the sewage discharge box and the housing. The chute is vertically arranged. The sealing door is slidably arranged in the chute. A cylinder for driving the lifting of the sealing door is provided in the chute at the top of the sealing door.

10. The sodium aluminate solution desilication device according to any one of claims 1 to 9, characterized in that, An air intake system is provided in the housing below the electrode plate. The air intake system includes a plurality of rectangular air intake frames. The plurality of air intake frames are arranged in sequence from inside to outside and their sizes gradually increase. A plurality of air pipes are communicated between the plurality of air intake frames. A plurality of air pipes connected to the housing are communicated with the outermost air intake frame. The air pipes are communicated with an external air source. A plurality of air nozzles are provided at the top of the air intake frame. The plurality of air nozzles are equidistantly arranged on the track of the air intake frame where they are located.

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