Wastewater filtering device for silicon carbide washing

Abstract

The invention relates to the technical field of advanced energy-saving and environment-friendly equipment, and discloses a silicon carbide washing wastewater filtering device which comprises a shell, a plurality of groups of electrode screen plates and a rotating shaft which penetrates through the shell and is rotationally mounted, and a rotating frame is fixed on the outer wall of the rotating shaft and located in an inner cavity of the shell; and a plurality of groups of radial sliding grooves for limiting the sliding path of the electrode screen plate are formed in the outer wall of the rotating frame along the axis at equal angles. According to the equipment, continuous gradual change adjustment of electrode current along with a rotation angle is realized through a variable resistance mechanism consisting of an electrode screen plate, an embedded frame, a connecting rod, a sliding sleeve, a metal ring and a resistance tube, and the current is prevented from suddenly dropping to an open circuit state from a working peak value, so that the impact of back electromotive force on a power supply system is effectively weakened; the electric corrosion of electrode connection points and the insulation aging of the transformer are slowed down, the sewage treatment efficiency is ensured, the energy consumption is reduced, and the waste of electric energy in a non-treatment area is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of advanced energy-saving and environment-friendly equipment, and particularly relates to a wastewater filtering device for silicon carbide washing. BACKGROUND

[0002] High-pollution wastewater is generated in the cutting and pickling links in the production of silicon carbide, and is characterized by strong acidity, high colloidal silicon, high iron ions and nanoscale abrasives. The traditional chemical precipitation method faces the bottleneck of high reagent cost, large sludge quantity and difficulty in deep silicon removal. The increasingly stringent emission standards make it urgent to rely on advanced energy-saving and environment-friendly equipment to build a green and efficient technical system in the field of water pollution prevention and control. Therefore, modern processes often treat silicon carbide wastewater in several main treatment links, such as pretreatment, electrocoagulation, rough filtration, membrane separation and resource recovery. In the pretreatment stage, professional equipment is used to realize separation function, and large particle silicon carbide is efficiently recovered through a cyclone separator. The electrocoagulation unit is based on the principle of electrochemistry, and uses metal ions generated by anode dissolution to neutralize the charge of colloidal silicon. At the same time, micro-bubbles generated by hydrogen evolution on the cathode realize air floatation separation, and simultaneously remove iron, silicon and nanoscale abrasives in water. The rough filtration link focuses on improving filtration efficiency, and often uses an activated carbon bed to deeply adsorb residual pollutants in the electrocoagulation effluent, effectively protecting the subsequent nanofiltration membrane assembly. The membrane separation stage further optimizes the separation effect. First, the ultrafiltration is used to retain small suspended solids, and then the nanofiltration is used to accurately separate sulfate and chloride ions, finally realizing fresh water reuse and concentrated liquid diversion. The resource recovery link forms a closed loop. The iron sludge is converted into red iron oxide pigment by calcination, and the concentrated liquid is recovered into high-purity sodium sulfate by a hot crystallization process, which takes into account pollution control and resource recycling throughout the process.

[0003] However, the surface of the anode and cathode of the existing electrocoagulation equipment will be seriously passivated when treating silicon carbide wastewater for a long time, especially when treating high colloidal silicon wastewater. A dense oxide layer will form on the surface to hinder the continuous dissolution of metal ions, which requires frequent shutdown for maintenance, reducing the treatment efficiency. At the same time, during the process of moving out of the water body for reversal, the current will suddenly drop to a low value, and the maximum working current of the electrode in the water body will suddenly change to an open circuit state. This sudden change of current may generate a reverse electromotive force, causing an overvoltage impact on the power supply system, leading to electrode connection point corrosion damage and transformer winding insulation aging. In addition, when the electrode is re-immersed in the water body, the current may suddenly increase from zero to a peak value (i.e. from the insulation state of air to the high conductivity state of water), and the instantaneous current impact may cause the power supply to trip due to overload protection, forcing the system to restart and affecting continuous operation efficiency. The double problems of current mutation and electrode passivation significantly restrict the stability and resource efficiency of the equipment in the treatment of silicon carbide wastewater. SUMMARY

[0004] The technical problem to be solved by the present application is that in the prior art, the passivation of the electrode surface layer is prone to frequent shutdown, which reduces the efficiency, and when the electrode mesh plate is separated from the water body, overvoltage damage may occur, overload tripping, current impact and other factors may cause operation instability.

[0005] In order to achieve the above purpose, the following technical scheme is adopted in the present application: a wastewater filtering device for silicon carbide water washing, comprising a shell, a plurality of electrode mesh plates and a rotating shaft penetrating through the shell and being rotatably installed, a rotating frame is fixed to the outer wall of the rotating shaft and located in the inner cavity of the shell, a plurality of radial sliding grooves for limiting the sliding path of the electrode mesh plate are arranged at equal angles along the axis of the rotating frame, and a plurality of variable resistance mechanisms for automatically adjusting the current size according to the activity state of the electrode mesh plate are fixed at equal angles around the axis of the rotating shaft on the outer wall of the rotating frame on one side close to both ends. The variable resistance mechanism comprises a plurality of support pipes fixed at equal angles around the axis of the rotating shaft, an electric resistance pipe is fixed at the inner axis position of the support pipe, a wire is provided in the electric resistance pipe, and the output end of the wire is connected to the middle position of the electric resistance pipe, two sets of sliding sleeve pipes are symmetrically and slidingly sleeved on the outer wall of the support pipe, a metal ring for adjusting the resistance value of the electrode mesh plate by changing the position of the electrode mesh plate is fixed in the inner part of each set of sliding sleeve pipes, and the metal ring is slidingly sleeved on the outer wall of the electric resistance pipe. The inner part of each set of radial sliding grooves is slidingly installed with an embedded frame for connecting the electrode mesh plate and the variable resistance mechanism.

[0006] Preferably, the electrode mesh plate is installed in the inner part of the embedded frame, and two sets of connecting rods are symmetrically hinged to the lower surface of the embedded frame, and the other ends of the two sets of connecting rods are respectively hinged to the upper surfaces of the two sets of sliding sleeve pipes.

[0007] Preferably, a plurality of embedded grooves matching the size of the electrode mesh plate are formed on the surface of the embedded frame, and a bolt hole for fixing the electrode mesh plate is formed at each corner of the embedded groove.

[0008] Preferably, a plurality of limiting sliding grooves are formed on the surface of the support pipe, a limiting sliding block is fixed to the inner wall of the sliding sleeve pipe corresponding to the limiting sliding groove, and each set of limiting sliding blocks is slidingly connected with the inner wall of the limiting sliding groove.

[0009] Preferably, two sets of threaded limiting blocks are symmetrically and threadedly sleeved on the outer wall of the support pipe, and the outer wall of the support pipe is provided with external threads connected with the two sets of threaded limiting blocks on both sides, and the external threads on both sides of the outer wall of the support pipe are opposite in direction.

[0010] Preferably, an annular groove is formed in the center of the threaded limiting block, and an internal thread hole matching the external thread of the outer wall of the support pipe is formed in the center of the annular groove.

[0011] Preferably, two sets of springs are symmetrically sleeved on the outer walls of both sides of the support tube, one end of the spring is in contact with the inner wall of the threaded limiting block, and the other end of the spring is in contact with one side of the outer wall of the sliding sleeve.

[0012] Preferably, one side of the outer wall of the rotating frame has multiple sets of conductive carbon brushes fixed at equal angles around the axis. The conductive carbon brushes are arranged alternately with one short and one long brush, and the input end of the wire located inside the resistor tube is connected to a set of conductive carbon brushes at the corresponding position.

[0013] Preferably, a mounting plate is fixed to one side of the outer wall of the housing, and multiple sets of conductive rings are coaxially fixed to the side of the outer wall of the mounting plate near the housing. Each set of conductive rings is symmetrical, and the multiple sets of conductive rings are arranged alternately with positive and negative electrode directions from top to bottom.

[0014] Preferably, a motor is fixed to the outer wall of the other side of the housing, and the output end of the motor is connected to one end of the rotating shaft through a coupling.

[0015] The novel technical effects and advantages of this invention are as follows: In this invention, the device uses a variable resistance mechanism composed of an electrode mesh plate, a frame, a connecting rod, a sliding sleeve, a metal ring, and a resistance tube to achieve continuous and gradual adjustment of the electrode current with the rotation angle. This avoids the current from suddenly dropping from the working peak to the open circuit state, thereby effectively reducing the impact of the back electromotive force on the power supply system, slowing down the electrolytic corrosion of the electrode connection point and the aging of the transformer insulation, and reducing energy consumption while ensuring the efficiency of sewage treatment, thus avoiding the waste of electrical energy in the non-treatment area.

[0016] In this novel invention, the periodic dynamic conversion of electrode polarity is achieved through the coordinated work of alternating long and short conductive carbon brushes and conductive rings with opposite polarities, thereby solving the anode passivation problem, eliminating the dense oxide layer in colloidal silicon wastewater treatment, significantly reducing the frequency of downtime maintenance, and ensuring the continuous and stable operation and resource utilization efficiency of silicon carbide wastewater treatment. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram showing the structural positions of the outer casing, water inlet pipe, reversing unit, and exhaust pipe of the present invention. Figure 2 This is a schematic diagram of the scum discharge pipe, sewage discharge pipe and motor structure of the present invention; Figure 3 This is a front view schematic diagram of the internal structure of the device of the present invention; Figure 4 This is a schematic diagram of the rotating frame and variable resistance mechanism of the present invention; Figure 5 This is a schematic diagram of the rotating frame, rotating shaft, motor, and radial slide groove structure of the present invention. Figure 6 This is a schematic diagram of the electrode mesh plate, insert frame, and variable resistance mechanism of the present invention; Figure 7 This is a schematic diagram showing the disassembled frame structure of the present invention; Figure 8 This is a schematic diagram showing the disassembled structure of the variable resistance mechanism of the present invention; Figure 9 This is a schematic diagram of the sliding sleeve structure of the present invention; Figure 10 This is a schematic diagram of the mounting plate structure of the present invention; Figure 11 This is a schematic diagram of the conductive ring structure of the present invention; Figure 12 This is a schematic diagram of the conductive carbon brush structure of the present invention.

[0018] Legend: 1. Outer shell; 11. Rotating shaft; 12. Motor; 2. Rotating frame; 21. Radial groove; 3. Electrode mesh plate; 4. Embedded frame; 41. Connecting rod; 5. Support tube; 51. Limiting groove; 52. Resistance tube; 53. Sliding sleeve; 531. Limiting slider; 532. Metal ring; 54. Threaded limiting block; 55. Spring; 6. Mounting plate; 61. Conductive ring; 7. Conductive carbon brush. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] Reference Figures 1-12 As shown, the present invention provides a technical solution: a wastewater filtration device for silicon carbide washing, including a shell 1, multiple sets of electrode mesh plates 3 and a rotating shaft 11 rotatably installed through the shell 1. A rotating frame 2 is fixed on the outer wall of the rotating shaft 11 and located in the inner cavity of the shell 1. Multiple sets of radial grooves 21 for limiting the sliding path of the electrode mesh plates 3 are provided at equal angles along the axis on the outer wall of the rotating frame 2. Multiple sets of variable resistance mechanisms that automatically adjust the current according to the movement of the electrode mesh plates 3 are fixed at equal angles around the axis on the outer wall of the rotating frame 2 at both ends. The variable resistance mechanism includes multiple sets of support tubes 5 fixed at equal angles around the axis of the rotation shaft 11. A resistor tube 52 is fixed at the internal axis position of the support tube 5. A wire is passed through the inside of the resistor tube 52, and the middle position of the resistor tube 52 is connected to the output end of the wire. Two sets of sliding sleeves 53 are symmetrically slidably sleeved on the outer wall of the support tube 5. A metal ring 532 is fixed inside the two sets of sliding sleeves 53 to adjust the resistance value of the electrode mesh plate 3 by changing the position of the electrode mesh plate 3. The metal ring 532 is slidably sleeved on the outer wall of the resistor tube 52. Each radial groove 21 has a sliding frame 4 for connecting the electrode mesh plate 3 and the variable resistance mechanism.

[0021] Reference Figures 4-8 As shown in this embodiment: the electrode mesh plate 3 is installed inside the frame 4, and two sets of connecting rods 41 are symmetrically hinged on the lower surface of the frame 4, and the other ends of the two sets of connecting rods 41 are respectively hinged to the upper surface of the two sets of sliding sleeves 53.

[0022] Reference Figures 4-8 As shown in this embodiment: the surface of the frame 4 is provided with a groove that matches the size of the electrode mesh plate 3, and bolt holes for fixing the electrode mesh plate 3 are provided at the four corners of the groove. The damaged electrode mesh plate 3 can be replaced individually by using the groove on the surface of the frame 4 and the bolts, thereby reducing the cost of maintenance and replacement.

[0023] Reference Figures 4-8 As shown in this embodiment: multiple sets of limiting grooves 51 are opened on the surface of the support tube 5, and limiting sliders 531 are fixed at the corresponding positions of the inner wall of the sliding sleeve 53 and the limiting grooves 51. Each set of limiting sliders 531 is slidably connected to the inner wall of the limiting groove 51.

[0024] Reference Figures 4-8 As shown in this embodiment: the outer wall of the support tube 5 is symmetrically threaded with two sets of threaded limiting blocks 54, and both sides of the outer wall of the support tube 5 are provided with external threads that connect with the two sets of threaded limiting blocks 54, and the external threads on both sides of the outer wall of the support tube 5 are in opposite directions.

[0025] Reference Figures 6-8 As shown in this embodiment: the center of the threaded limiting block 54 is provided with an annular groove, and the center of the annular groove is provided with an internal thread through hole that matches the external thread of the outer wall of the support tube 5. By twisting the threaded limiting block 54, the maximum range of motion of the sliding sleeve 53 can be adjusted independently, that is, the current (which can be varied within the cycle) can be adjusted according to the electrode mesh plate 3 of different materials, thereby improving the versatility of the equipment.

[0026] Reference Figures 6-8As shown in this embodiment: two sets of springs 55 are symmetrically sleeved on the outer walls of both sides of the support tube 5. One end of the spring 55 contacts the inner wall of the threaded limit block 54, and the other end of the spring 55 contacts the outer wall of one side of the sliding sleeve 53. The spring 55 can provide a certain assistance for the sliding sleeve 53 to reset and prevent the equipment from jamming.

[0027] Reference Figures 3-12 As shown in this embodiment: multiple sets of conductive carbon brushes 7 are fixed at equal angles around the axis on one side of the outer wall of the rotating frame 2. The conductive carbon brushes 7 are arranged alternately with one short and one long, and the input end of the wire located inside the resistor tube 52 is connected to a set of conductive carbon brushes 7 at the corresponding position.

[0028] Reference Figures 10-12 As shown in this embodiment: a mounting plate 6 is fixed on one side of the outer wall of the outer shell 1. Multiple sets of conductive rings 61 are coaxially fixed on the side of the outer wall of the outer shell 1 of the mounting plate 6. Each set of conductive rings 61 presents a symmetrical relationship, and the multiple sets of conductive rings 61 are arranged alternately with positive and negative electrode directions from top to bottom.

[0029] Reference Figures 1-3 As shown in this embodiment: a motor 12 is fixed on the outer wall of the other side of the outer shell 1. The output end of the motor 12 is connected to one end of the rotating shaft 11 through a coupling. A scum discharge pipe for discharging scum is installed on the outer wall of one end of the outer shell 1. A water inlet pipe is installed on the other end of the outer shell 1. A sewage discharge pipe for discharging heavier sludge at the bottom is installed on the lower surface of the outer shell 1. An exhaust pipe for releasing excess gas inside the outer shell 1 is installed on the upper surface of the outer shell 1.

[0030] Working principle: First, after the sewage undergoes pretreatment, it is continuously transported to the inner cavity of the outer shell 1 through the pumping equipment and the transmission pipeline connected to the inlet pipe. At this time, the start motor 12 drives the entire rotating frame 2 to rotate at a constant speed through the rotating shaft 11. Multiple sets of electrode mesh plates 3 fixed on the rotating frame 2 rotate synchronously with the rotating frame 2 (in a continuous rotation state). When the two sets of electrode mesh plates 3 with opposite and adjacent electrodes rotate below the water surface (in a slightly tilted state), the two sets of electrode mesh plates 3 naturally retract inward along the radial groove 21 due to gravity (sliding towards the rotation axis 11). At the same time, the electrode mesh plates 3 retract inward and drive the two sets of connecting rods 41 to rotate through the downward movement of the frame 4, thereby driving the two sets of sliding sleeves 53 to slide away in opposite directions. At the same time, the metal rings 532 follow the sliding sleeves 53 away and the sliding sleeves 53 compress the springs 55 (in a compressed state). At this time, the distance between the two sets of metal rings 532 and the middle position of the resistor tube 52 increases, so the resistance value increases. Under the premise of constant voltage, the current of the set of electrode mesh plates 3 decreases. It should be noted that the electrode mesh plate 3, the frame 4, the connecting rod 41, the sliding sleeve 53, and the metal ring 532 are all made of conductive materials and form a circuit. The resistor tube 52 is existing technology, so it will not be described in detail here. The increase and decrease of the resistance value are adjusted by the change of the distance between the metal ring 532 and the surface of the resistor tube 52. Therefore, when a set of electrode mesh plates 3 leaves the water surface and rotates to the highest point, the distance between the two sets of sliding sleeves 53 and the metal ring 532 continuously increases, and the current decreases periodically (in an energy-saving state). Thus, the current of a single set of electrode mesh plates 3 changes periodically. Conversely, when the set of electrode mesh plates 3 rotates from entering the water body to the lowest point, the distance between the two sets of sliding sleeves 53 and the metal ring 532 continuously decreases, and the resistance value continuously decreases. Under constant voltage, the current of the set of electrode mesh plates 3 is the largest at the lowest point, and its electrochemical reaction is the strongest. In summary, this device utilizes a variable resistance mechanism composed of electrode mesh plate 3, frame 4, connecting rod 41, sliding sleeve 53, metal ring 532, and resistance tube 52. (When the electrode mesh plate 3 rotates and detaches from the water, gravity causes the spacing of the metal rings 532 to increase, the resistance value to gradually increase, and the current to smoothly decrease.) This mechanism enables continuous and gradual adjustment of the electrode current with the rotation angle (avoiding a sudden drop in current from the working peak to the open circuit state). This effectively reduces the impact of back electromotive force on the power supply system, slows down electrolytic corrosion at the electrode connection points and aging of transformer insulation, and reduces energy consumption while ensuring wastewater treatment efficiency (avoiding energy waste in non-treatment areas). Furthermore, when the multiple sets of electrode mesh plates 3 initially immersed in the lower water body rotate into the upper cavity, the conductive carbon brushes 7 of alternating lengths work in concert with the conductive rings 61 of opposite polarity (the electrode mesh plates 3 automatically contact the conductive rings 61 of opposite electrode direction when rotating into the cavity), realizing the periodic dynamic conversion of electrode polarity (making the same electrode alternate as the anode and cathode), thereby solving the anode passivation problem, eliminating the dense oxide layer in the treatment of colloidal silicon wastewater, significantly reducing the frequency of downtime maintenance, and ensuring the continuous and stable operation and resource utilization efficiency of silicon carbide wastewater treatment.

[0031] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A wastewater filtration device for silicon carbide washing, characterized in that, The device includes a housing, multiple sets of electrode mesh plates, and a rotating shaft that is rotatably installed through the housing. A rotating frame is fixed to the outer wall of the rotating shaft and located in the inner cavity of the housing. Multiple sets of radial grooves for limiting the sliding path of the electrode mesh plates are provided at equal angles along the axis on the outer wall of the rotating frame. Multiple sets of variable resistance mechanisms that automatically adjust the current according to the movement of the electrode mesh plates are fixed at equal angles around the axis on the outer wall of the two ends of the rotating frame. The variable resistance mechanism includes multiple sets of support tubes fixed at equal angles around the axis of rotation. A resistor tube is fixed at the internal axis position of the support tube. A wire is passed through the inside of the resistor tube, and the middle position of the resistor tube is connected to the output end of the wire. Two sets of sliding sleeves are symmetrically slidably sleeved on the outer wall of the support tube. A metal ring is fixed inside each of the two sets of sliding sleeves to adjust the resistance value of the electrode mesh plate by changing the position of the electrode mesh plate. The metal ring is slidably sleeved on the outer wall of the resistor tube. Each set of radial grooves has a sliding frame inside for connecting the electrode grid plate and the variable resistance mechanism.

2. The wastewater filtration device for silicon carbide washing according to claim 1, characterized in that: The electrode mesh plate is installed inside the frame, and two sets of connecting rods are symmetrically hinged to the lower surface of the frame, and the other ends of the two sets of connecting rods are respectively hinged to the upper surfaces of the two sets of sliding sleeves.

3. The wastewater filtration device for silicon carbide washing according to claim 1, characterized in that: The surface of the frame is provided with a groove that matches the size of the electrode mesh plate, and bolt holes for fixing the electrode mesh plate are provided at the four corners of the groove.

4. A wastewater filtration device for silicon carbide washing according to claim 1, characterized in that: The surface of the support tube is provided with multiple sets of limiting grooves, and the inner wall of the sliding sleeve is fixed with limiting sliders at the corresponding positions of the limiting grooves. Each set of limiting sliders is slidably connected to the inner wall of the limiting groove.

5. A wastewater filtration device for silicon carbide washing according to claim 1, characterized in that: The outer wall of the support tube is symmetrically threaded with two sets of threaded limiting blocks, and both sides of the outer wall of the support tube are provided with external threads that connect to the two sets of threaded limiting blocks. The external threads on both sides of the outer wall of the support tube are in opposite directions.

6. A wastewater filtration device for silicon carbide washing according to claim 5, characterized in that: The threaded limiting block has an annular groove at its center, and the annular groove has an internal thread through hole at its center that matches the external thread of the outer wall of the support tube.

7. A wastewater filtration device for silicon carbide washing according to claim 1, characterized in that: Two sets of springs are symmetrically sleeved on the outer walls of both sides of the support tube. One end of the spring contacts the inner wall of the threaded limiting block, and the other end of the spring contacts the outer wall of one side of the sliding sleeve.

8. A wastewater filtration device for silicon carbide washing according to claim 1, characterized in that: Multiple sets of conductive carbon brushes are fixed at equal angles around the axis on one side of the outer wall of the rotating frame. The conductive carbon brushes are arranged alternately with one short and one long brush, and the input end of the wire located inside the resistor tube is connected to a set of conductive carbon brushes at the corresponding position.

9. A wastewater filtration device for silicon carbide washing according to claim 1, characterized in that: A mounting plate is fixed to one side of the outer wall of the housing. Multiple sets of conductive rings are coaxially fixed to the outer wall of the mounting plate near the housing. Each set of conductive rings is symmetrical, and the multiple sets of conductive rings are arranged alternately with positive and negative electrode directions from top to bottom.

10. A wastewater filtration device for silicon carbide washing according to claim 1, characterized in that: A motor is fixed to the outer wall of the other side of the housing, and the output end of the motor is connected to one end of the rotating shaft through a coupling.

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