Waste acid resourceful treatment system

Abstract

The invention discloses a waste acid resourceful treatment system and method, and belongs to the field of waste acid treatment.The waste acid resourceful treatment system comprises pretreatment equipment, reverse osmosis equipment and bipolar membrane electrodialysis equipment which are sequentially arranged in the treatment direction, and a supernatant liquid outlet of the pretreatment equipment is communicated with the reverse osmosis equipment through a pipeline; a concentrated water outlet of the reverse osmosis equipment is communicated with the bipolar membrane electrodialysis equipment through a pipeline, and an alkali liquor outlet of the bipolar membrane electrodialysis equipment is communicated with the pretreatment equipment through a pipeline; the pretreatment equipment comprises a frame body, a filtering assembly, a first liquid inlet assembly, a first box body, a first stirring assembly, a second liquid inlet assembly, a second box body, a second stirring assembly, a third stirring assembly, a motor and a transmission assembly. According to the method, zero wastewater discharge is achieved, and resourceful treatment of waste acid can be achieved.

Description

Technical Field

[0001] The invention belongs to the field of waste acid treatment, and in particular relates to a waste acid resource treatment system. Background Art

[0002] There are many existing methods for waste acid treatment, each of which has its specific application scenarios and advantages and disadvantages.

[0003] Among them, the neutralization method is commonly used. The neutralization method is to add alkaline substances, such as sodium hydroxide, calcium hydroxide, etc., to make the acid and alkali in the wastewater undergo a neutralization reaction, thereby increasing the pH value of the wastewater to meet the discharge standard. This method is simple and easy, but it will produce a large amount of salt waste, which requires further treatment. In addition, waste acid contains not only acidic substances, but also suspended matter, colloidal substances, heavy metal ions, and reducing or oxidizing substances. If alkali is directly added for neutralization reaction, the above substances will affect the neutralization reaction, the reaction effect is not good, and there are impurities, which is not conducive to subsequent treatment. Summary of the invention

[0004] The purpose of the present invention is to provide a waste acid resource treatment system to overcome at least one of the above-mentioned defects in the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a waste acid resource treatment system, comprising a pretreatment device, a reverse osmosis device, and a bipolar membrane electrodialysis device arranged in sequence along a treatment direction, wherein an upper clear liquid outlet of the pretreatment device is connected to the reverse osmosis device through a pipeline, a concentrated water outlet of the reverse osmosis device is connected to the bipolar membrane electrodialysis device through a pipeline, and an alkali liquid outlet of the bipolar membrane electrodialysis device is connected to the pretreatment device through a pipeline, and the pretreatment device comprises a frame, a filter component, a first liquid inlet component, a first box, a first stirring component, a second liquid inlet component, a second box, a second stirring component, a third stirring component, a motor, and a transmission component, wherein a filter component is arranged in the frame, and the frame and the first box are connected. The first box body is connected through a first liquid inlet assembly, the first stirring assembly is arranged in the first box body, the interior of the second box body is provided with a partition, a water passage is provided between the partition and the inner top wall of the second box body, the first box body and the second box body are connected through a second liquid inlet assembly, the motor, the second stirring assembly, and the third stirring assembly are all fixed on the top of the second box body, the output end of the motor is connected to the second stirring assembly, the stirring end of the second stirring assembly extends to the interior of the second box body and is located on the left side of the partition, the stirring end of the third stirring assembly extends to the interior of the second box body and is located on the right side of the partition, and the second stirring assembly is respectively connected to the first stirring assembly and the third stirring assembly through a transmission assembly.

[0007] Preferably, the water outlet of the reverse osmosis device is connected to the recovery chamber of the bipolar membrane electrodialysis device through a pipeline, and the salt solution outlet of the bipolar membrane electrodialysis device is connected to the reverse osmosis device through a pipeline.

[0008] Preferably, the filter assembly includes a pull ring, an inclined net, a horizontal net, and a vertical net. The inclined net is placed obliquely in the frame. A pull ring is fixed to the top of the inclined net, and the pull ring is located outside the frame. A horizontal net is fixed to the bottom end of the inclined net, and the horizontal net is placed on the bottom wall of the frame. A vertical net is provided on the top of the horizontal net, and the left end of the vertical net contacts the left side wall of the frame. The right side of the vertical net has an inclined surface inclined from top to bottom to the right.

[0009] Preferably, the first liquid inlet assembly includes a first pump, a first water pipe, a first venturi tube, a first storage tank, and a first suction pipe. The water inlet end of the first water pipe is fixedly connected to the lower part of the right side wall of the frame, the water outlet end of the first water pipe is connected to the contraction section of the first venturi tube, the diffusion section of the first venturi tube is fixedly connected to the upper part of the left side wall of the first box, the first storage tank is fixed to the left side wall of the first box, the top end of the first suction pipe is fixedly connected to the throat of the first venturi tube, the bottom end of the first suction pipe extends to the bottom of the first storage tank, and the first pump is fixed to the right side wall of the frame and connected to the first water pipe.

[0010] Preferably, the first stirring assembly includes a first bearing seat, a hollow rotating shaft, a first stirring blade, an aerator, an air supply pipe, an aeration plate, and an aeration column. The first bearing seat and the aerator are fixed to the top of the first box body. The lower part of the hollow rotating shaft passes through the first bearing seat and the top wall of the first box body, and extends to the interior of the first box body where a plurality of first stirring blades are fixed. The aeration plate is fixedly connected to the lower part of the hollow rotating shaft, and the top of the aeration plate is fixedly connected to a plurality of aeration columns. The plurality of first stirring blades are divided into two layers, the upper layer of the first stirring blades is inserted between the plurality of aeration columns, and the lower layer of the first stirring blades is located below the aeration plate. The air outlet end of the aerator is fixedly connected to the air supply pipe, and the air outlet end of the air supply pipe extends to the interior of the hollow rotating shaft.

[0011] Preferably, the second liquid inlet assembly includes a second pump, a second water pipe, a second venturi tube, a second storage tank, and a second suction pipe. The water inlet end of the second water pipe extends to the lower inner part of the first tank body, the water outlet end of the second water pipe is connected to the contraction section of the second venturi tube, the diffusion section of the second venturi tube is fixedly connected to the upper part of the left side wall of the second tank body, the second storage tank is fixed to the left side wall of the second tank body, the top end of the second suction pipe is fixedly connected to the throat of the second venturi tube, the bottom end of the second suction pipe extends to the bottom of the second storage tank, and the second pump is fixed to the top of the first tank body and is connected to the second water pipe.

[0012] Preferably, the second stirring assembly includes a second bearing seat, a first stirring shaft, a second stirring blade, a first sealed box, a third bearing seat, a first bevel gear, a second bevel gear, a fourth bearing seat, a second stirring shaft, and a third stirring blade. The second bearing seat is fixed to the left side of the top of the second box body, the lower part of the first stirring shaft passes through the second bearing seat and the top wall of the second box body, and extends to the inside of the second box body where the second stirring blade is fixed, the top end of the first stirring shaft is connected to the output end of the motor, the first sealed box is fixed to the inner rear side wall of the second box body, and the third bearing seat is fixed to the inner top wall of the first sealed box. The bottom end of the first stirring shaft passes through the top wall of the first sealing box and the third bearing seat, and is fixed with a first bevel gear. The fourth bearing seats are fixed on the left and right sides of the bottom wall of the first sealing box. The second bevel gear is fixed to the top of the second stirring shaft, and the second bevel gear is meshed with the first bevel gear. The lower part of the second stirring shaft passes through the fourth bearing seat and the bottom wall of the first sealing box, and extends to the outside of the first sealing box where a third stirring blade is fixed. The third stirring blade is inclined and the second stirring blade is horizontally arranged. The first stirring shaft and the first sealing box, as well as the second stirring shaft and the first sealing box are sealed.

[0013] Preferably, the third stirring assembly includes a fifth bearing seat, a third stirring shaft, a fourth stirring blade, a serpentine blade, a second sealed box, a sixth bearing seat, a seventh bearing seat, a first spur gear, a second spur gear, a fourth stirring shaft, and a fifth stirring blade. The fifth bearing seat is fixed to the right side of the top of the second box body. The third stirring shaft passes through the fifth bearing seat and the top wall of the second box body, and extends to the second box body in which two layers of fourth stirring blades are fixed. The second sealed box is fixed to the inner rear side wall of the second box body between the upper and lower layers of fourth stirring blades. The sixth bearing seat is fixed to the inner top wall of the second sealed box. The third stirring shaft passes through the sixth bearing seat and the upper and lower side walls of the second sealed box and is located in the second sealed box. The third stirring shaft is fixed with a first spur gear, and the left and right side walls in the second sealed box are fixed with a seventh bearing seat, the top of the fourth stirring shaft is fixed with a second spur gear, the second spur gear is meshed with the first spur gear, the bottom end of the fourth stirring shaft passes through the seventh bearing seat and the bottom wall of the second sealed box, and extends to the outside of the second sealed box where a fifth stirring blade is fixed, the fifth stirring blade is located between the upper and lower layers of the fourth stirring blades, and a vertically arranged serpentine blade is fixed to the end of the fourth stirring blade located on the lower layer, the serpentine blade is outside the outer side of the fifth stirring blade, and is located between the upper and lower layers of the fourth stirring blades, and the third stirring shaft and the second sealed box, as well as the fourth stirring shaft and the second sealed box are all sealed.

[0014] Preferably, the transmission assembly includes a double-grooved transmission wheel, a first transmission wheel, a second transmission wheel, a first transmission belt, and a second transmission belt. The double-grooved transmission wheel is fixed to the first agitator shaft, the first transmission wheel is fixed to the hollow rotating shaft, the second transmission wheel is fixed to the third agitator shaft, the double-grooved transmission wheel and the first transmission wheel are connected by the first transmission belt, and the double-grooved transmission wheel and the second transmission wheel are connected by the second transmission belt.

[0015] The present invention also provides a waste acid resource treatment process, which adopts the above-mentioned waste acid resource treatment system for treatment, and comprises the following steps: sending the waste acid into a pretreatment device, filtering it through a filtering component, then adding a heavy metal capture agent while sending the waste acid into the first box through a first liquid inlet component, stirring and mixing through a first stirring component to form a heavy metal precipitate, sending the waste acid after heavy metal removal into the left side of the second box through a second liquid inlet component, adding a coagulant, stirring and mixing through a second stirring component to form a flocculation precipitate, the upper clear liquid after the coagulation treatment enters the right side of the second box through a water passage, adding alkali solution to the right side of the second box, stirring and mixing through a third stirring component to form a hydroxide precipitate, collecting the hydroxide precipitate, sending the upper clear liquid into a reverse osmosis device for concentration treatment, sending the concentrated water obtained by the concentration treatment into a bipolar membrane electrodialysis device for treatment to obtain a salt solution, an alkali solution, and an acid solution, the acid solution is reused to other sections, the alkali solution is reused to the right side of the second box, the salt solution is reused to the reverse osmosis device, and the produced water obtained by the concentration treatment is sent to a recovery chamber of the bipolar membrane electrodialysis device.

[0016] The beneficial effects of the present invention are:

[0017] 1. There is no wastewater discharge during the entire treatment process, which not only achieves zero wastewater discharge, but also can realize the resource treatment of waste acid, not only recovering aluminum hydroxide, but also recovering acid. The recycled sodium hydroxide solution reduces the amount of sodium hydroxide solution used in the neutralization reaction and reduces the treatment cost.

[0018] 2. The suspended solid particles in the waste acid are filtered out through the inclined net. Through the cooperation of the inclined net, the horizontal net and the vertical net, a collection tank for collecting suspended solid particles is formed. When the suspended solid particles need to be removed, the inclined net is pulled up through the pull ring to drive the horizontal net and the vertical net to move upward, which is convenient for waste unloading.

[0019] 3. No additional dosing device is required. The heavy metal collector and coagulant can be automatically added directly through the water flow, and the added amount changes with the inlet flow rate, realizing automatic matching addition of the reagents. The design is ingenious.

[0020] 4. The waste acid and heavy metal collector are first mixed in the first venturi tube, and the waste acid and coagulant are first mixed in the second venturi tube, which is beneficial to improve the subsequent stirring and mixing efficiency.

[0021] 5. Aeration is achieved during stirring. Aeration not only enhances the stirring effect, making the heavy metal scavenger and waste acid mix more evenly, but also the oxygen provided by aeration can oxidize the reducing substances such as ferrous ions in the waste acid, and then remove them by precipitation to avoid their influence on the subsequent aluminum hydroxide precipitation.

[0022] 6. By setting the first stirring blades interspersed between a plurality of aeration columns, not only the aeration effect can be optimized, so that the bubbles are more evenly dispersed in the mixed liquid, but also the stirring effect can be further enhanced.

[0023] 7. Through the cooperation of the second stirring blade and the third stirring blade rotating in opposite directions, mutual shearing and collision effects are formed, which can more effectively destroy lumps and bubbles in the mixed liquid and promote uniform mixing; at the same time, the stirring blades in opposite directions can form a more complex flow field, increase the movement trajectory and mixing opportunities of the mixed liquid during the stirring process, thereby improving the stirring efficiency; the second stirring blade and the third stirring blade rotating in opposite directions can produce stronger turbulence and eddy effects, which help to disperse and mix the components in the mixed liquid more evenly; and can effectively reduce the stirring dead angle.

[0024] 8. The combination of a horizontally arranged second stirring blade and an inclined third stirring blade can further enhance the shear force and vortex effect, and the inclined third stirring blade can guide the flow direction of the mixed liquid, so that the mixed liquid can circulate more smoothly in the second box.

[0025] 9. When the fourth stirring blades of the upper and lower layers rotate in the same direction, the mixed liquid can be pushed to form an up and down circulation flow in the second box, which is helpful for mixing the mixed liquid in the vertical direction; the fifth stirring blade located in the middle layer rotates in the opposite direction, which can break the continuity of the flow of the mixed liquid in the upper and lower layers, so that the mixed liquid can produce a stronger shear and mixing effect in the horizontal direction; and the counter-rotating fifth stirring blade can more effectively stir every corner of the second box, reduce the dead corners of stirring, and ensure uniform mixing; when the fifth stirring blade in the middle layer rotates in the opposite direction, a vortex will be formed inside the second box. The existence of the vortex helps the mixed liquid to be evenly distributed in the three-dimensional space in the second box, further improving the stirring effect; the combination of the same-direction rotation of the fourth stirring blades of the upper and lower layers and the counter-rotation of the fifth stirring blade in the middle layer can greatly enhance the tumbling degree of the mixed liquid, which helps the sodium hydroxide solution and the waste acid to fully contact and mix, thereby improving the stirring efficiency.

[0026] 10. The flow pattern of the mixed liquid is changed by setting the vertical serpentine blades. When the mixed liquid flows through the serpentine blades, it will be affected by the shape of the serpentine blades, resulting in a more complex flow path and turbulence effect. This complex flow pattern helps to mix the sodium hydroxide solution and the waste acid more fully; and helps to disperse the sodium hydroxide solution more evenly in the waste acid, thereby improving the stirring effect; when the mixed liquid flows through the serpentine blades, it will be dispersed into different flow paths, thereby avoiding stirring dead corners.

[0027] 11. Through the setting of the transmission component, one-to-three is achieved. Only one motor is needed to realize the stirring operation of the first stirring component, the second stirring component, and the third stirring component, thereby reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a system block diagram of an embodiment of the present invention.

[0029] Figure 2 It is a schematic diagram of the structure of the preprocessing equipment according to an embodiment of the present invention.

[0030] Figure 3 It is a schematic diagram of the structure of the filter assembly according to an embodiment of the present invention.

[0031] Figure 4 It is a structural schematic diagram of the first box body and the first stirring assembly according to an embodiment of the present invention.

[0032] Figure 5 It is a schematic diagram of the coordinated structure of an aeration plate, an aeration column, and a first stirring blade according to an embodiment of the present invention.

[0033] Figure 6 It is a partial structural diagram of an embodiment of the present invention.

[0034] Figure 7 It is a partial structural schematic diagram of the second stirring assembly according to an embodiment of the present invention.

[0035] Figure 8 It is a partial structural schematic diagram of the third stirring assembly of an embodiment of the present invention.

[0036] The markings in the accompanying drawings are: 100-pretreatment equipment, 200-reverse osmosis equipment, 300-bipolar membrane electrodialysis equipment, 1-frame, 2-filter assembly, 3-first liquid inlet assembly, 4-first box, 5-first stirring assembly, 6-second liquid inlet assembly, 7-second stirring assembly, 8-third stirring assembly, 9-transmission assembly, 10-motor, 11-second box, 12-water passage, 13-partition, 21-pull ring, 22-oblique net, 23-horizontal net, 24-vertical net, 25-inclined surface, 31-first pump, 32-first water pipe, 33-first venturi tube, 34-first storage tank, 35-first suction pipe, 51-first bearing seat, 52-hollow shaft, 53-first stirring blade, 54-aerator, 55-air supply pipe, 56-aeration plate, 57-aeration column, 61-second pump, 62-second water pipe, 63-second venturi tube, 64-second storage tank, 65-second suction pipe, 71-second bearing seat, 72-first stirring shaft, 73-second stirring blade, 74-first sealing box, 75-third bearing seat, 76-first bevel gear, 77-second bevel gear, 78-fourth bearing seat, 79-second stirring shaft, 710-third stirring blade, 81-fifth bearing seat, 82-third stirring shaft, 83-fourth stirring blade, 84-serpentine blade, 85-second sealing box, 86-sixth bearing seat, 87-seventh bearing seat, 88-first spur gear, 89-second spur gear, 810-fourth stirring shaft, 811-fifth stirring blade, 91-double groove transmission wheel, 92-first transmission wheel, 93-second transmission wheel, 94-first transmission belt, 95-second transmission belt. DETAILED DESCRIPTION

[0037] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0038] Contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings, which is 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] like Figures 1 to 8As shown, a waste acid resource treatment system provided in this embodiment includes a pretreatment device 100, a reverse osmosis device 200, and a bipolar membrane electrodialysis device 300 arranged in sequence along the treatment direction, the upper clear liquid outlet of the pretreatment device 100 is connected to the reverse osmosis device 200 through a pipeline, the concentrated water outlet of the reverse osmosis device 200 is connected to the bipolar membrane electrodialysis device 300 through a pipeline, and the alkali liquid outlet of the bipolar membrane electrodialysis device 300 is connected to the pretreatment device 100 through a pipeline. The pretreatment device 100 includes a frame 1, a filter component 2, a first liquid inlet component 3, a first box 4, a first stirring component 5, a second liquid inlet component 6, a second box 11, a second stirring component 7, a third stirring component 8, a motor 10, and a transmission component 9. The filter component 2 is arranged in the frame 1, and the frame 1 The first box body 4 is connected through the first liquid inlet assembly 3, the first stirring assembly 5 is arranged in the first box body 4, the second box body 11 has a partition 13 inside, and a water passage 12 is provided between the partition 13 and the inner top wall of the second box body 11, the first box body 4 and the second box body 11 are connected through the second liquid inlet assembly 6, the motor 10, the second stirring assembly 7, and the third stirring assembly 8 are all fixed on the top of the second box body 11, the output end of the motor 10 is connected to the second stirring assembly 7, the stirring end of the second stirring assembly 7 extends to the inside of the second box body 11 and is located on the left side of the partition 13, the stirring end of the third stirring assembly 8 extends to the inside of the second box body 11 and is located on the right side of the partition 13, and the second stirring assembly 7 is respectively connected to the first stirring assembly 5 and the third stirring assembly 8 through the transmission assembly 9. The water outlet of the reverse osmosis device 200 is connected to the recovery chamber of the bipolar membrane electrodialysis device 300 through a pipeline, and the salt solution outlet of the bipolar membrane electrodialysis device 300 is connected to the reverse osmosis device 200 through a pipeline.

[0040] This embodiment also provides a waste acid resource treatment process, which uses the above-mentioned waste acid resource treatment system for treatment, including the following steps:

[0041] The waste acid is sent to the pretreatment equipment 100, filtered through the filter component 2, and then the first liquid inlet component 3 is used to send the waste acid into the first box 4 while adding a heavy metal collector, and the waste acid is stirred and mixed by the first stirring component 5 to form a heavy metal precipitate. The second liquid inlet component 6 is used to send the waste acid after heavy metal removal to the left side of the second box 11, and a coagulant is added, and the waste acid is stirred and mixed by the second stirring component 7 to form a flocculation precipitate. The supernatant after the coagulation treatment enters the right side of the second box 11 through the water passage 12. Alkali solution is added to the right side of the second casing 11, and mixed by the third stirring assembly 8 to form hydroxide precipitation, and the hydroxide precipitation is collected, and the supernatant is sent to the reverse osmosis device 200 for concentration treatment, and the concentrated water obtained by the concentration treatment is sent to the bipolar membrane electrodialysis device 300 for treatment, and saline solution, alkali solution and acid solution are obtained, and the acid solution is reused to other workshop sections, and the alkali solution is reused to the right side of the second casing 11, and the saline solution is reused to the reverse osmosis device 200, and the produced water obtained by the concentration treatment is sent to the recovery chamber of the bipolar membrane electrodialysis device 300. The spent acid of the present embodiment is spent acid with hydrochloric acid and aluminum chloride. The suspended solid particles in the spent acid are filtered out by the filter assembly 2, so that the spent acid is clearer, which is conducive to the subsequent reaction with sodium hydroxide to generate aluminum hydroxide precipitation. Heavy metal ions are captured by heavy metal trapping agents, and heavy metal ions are formed into precipitation and removed to prevent them from causing greater harm to the environment, and also avoid their influence on the purity and subsequent treatment of aluminum hydroxide precipitation. By adding a coagulant, the suspended matter and colloidal substances in the waste acid are condensed into flocs and precipitated, some impurities and pollutants in the waste acid are removed, the interference with the aluminum hydroxide precipitation is reduced, and the precipitation effect is improved. Finally, by adding a sodium hydroxide solution, it reacts with the hydrochloric acid and aluminum chloride in the waste acid to form a sodium chloride solution and aluminum hydroxide precipitation. In this way, the purity of the obtained aluminum hydroxide precipitation and sodium chloride solution is higher. The sodium chloride solution is sent to the reverse osmosis device 200 for concentration treatment, and the concentrated concentrated water is treated by the bipolar membrane electrodialysis device 300 to obtain three liquids, namely sodium hydroxide solution, hydrogen chloride solution, and sodium chloride solution (dilute), and the sodium hydroxide solution is reused to the pretreatment device 100, the sodium chloride solution is reused to the reverse osmosis device 200, and the hydrogen chloride solution is reused to other sections. The produced water of the reverse osmosis device 200 is sent to the recovery room of the bipolar membrane electrodialysis device 300. There is no wastewater discharge in the whole treatment process, which not only achieves zero wastewater discharge, but also can realize the resource treatment of waste acid, not only recovers aluminum hydroxide, but also recovers acid, and the reused sodium hydroxide solution reduces the amount of sodium hydroxide solution used in the neutralization reaction, reducing the treatment cost. By integrating the coagulation treatment and the neutralization reaction treatment into a second box 11, the space occupation is reduced.

[0042] Wherein, the filter assembly 2 comprises a pull ring 21, an inclined net 22, a horizontal net 23, and a vertical net 24, the inclined net 22 is placed obliquely in the frame 1, the top of the inclined net 22 is fixed with a pull ring 21, the pull ring 21 is located outside the frame 1, the bottom of the inclined net 22 is fixed with a horizontal net 23, the horizontal net 23 is placed on the bottom wall of the frame 1, the top of the horizontal net 23 has a vertical net 24, the left end of the vertical net 24 is in contact with the left side wall of the frame 1, and the right side of the vertical net 24 has an inclined surface 25 inclined to the right from top to bottom. The suspended solid particles in the waste acid are filtered out by the inclined net 22, and a collection tank for collecting suspended solid particles is formed by the cooperation of the inclined net 22, the horizontal net 23, and the vertical net 24. When the suspended solid particles need to be taken away, the inclined net 22 is pulled up by the pull ring 21, and the horizontal net 23 and the vertical net 24 are driven to move upward, which is convenient for unloading. The setting of the inclined surface 25 prevents the suspended solid particles from accumulating on the top of the vertical net 24.

[0043] Among them, the first liquid inlet component 3 includes a first pump 31, a first water pipe 32, a first venturi tube 33, a first storage box 34, and a first suction pipe 35. The water inlet end of the first water pipe 32 is fixedly connected to the lower part of the right side wall of the frame 1, the water outlet end of the first water pipe 32 is connected to the contraction section of the first venturi tube 33, the diffusion section of the first venturi tube 33 is fixedly connected to the upper part of the left side wall of the first box 4, the first storage box 34 is fixed to the left side wall of the first box 4, the top end of the first suction pipe 35 is fixedly connected to the throat of the first venturi tube 33, the bottom end of the first suction pipe 35 extends to the bottom of the first storage box 34, and the first pump 31 is fixed to the right side wall of the frame 1 and is connected to the first water pipe 32.

[0044] Start the first pump 31, and pump the waste acid filtered by the inclined net 22 to the first venturi tube 33 through the first water pipe 32. When the waste acid passes through the throat of the first venturi tube 33, the flow rate is accelerated, and the pressure is reduced, forming a negative pressure, and the heavy metal collector in the first storage tank 34 is sucked into the first venturi tube 33 through the first suction pipe 35, and mixed with the waste acid and sent to the first box 4. Since the waste acid and the heavy metal collector are first mixed in the first venturi tube 33, it is beneficial to improve the subsequent stirring and mixing efficiency. With this arrangement, there is no need for an additional dosing device, and the automatic addition of the heavy metal collector is realized directly through the water flow, and the addition amount changes with the change of the water inlet flow rate, realizing the automatic matching addition of the agent, which is a clever design.

[0045] Among them, the first stirring component 5 includes a first bearing seat 51, a hollow rotating shaft 52, a first stirring blade 53, an aerator 54, an air supply pipe 55, an aeration plate 56, and an aeration column 57. The first bearing seat 51 and the aerator 54 are fixed on the top of the first box body 4. The lower part of the hollow rotating shaft 52 passes through the first bearing seat 51 and the top wall of the first box body 4, and extends to the interior of the first box body 4 where a plurality of first stirring blades are fixed. The aeration plate 56 is fixedly connected to the lower part of the hollow rotating shaft 52, and the top of the aeration plate 56 is fixedly connected to a plurality of aeration columns 57. The plurality of first stirring blades are divided into two layers, the upper layer of the first stirring blades is inserted between the plurality of aeration columns 57, and the lower layer of the first stirring blades is located below the aeration plate 56. The air outlet end of the aerator 54 is fixedly connected to the air supply pipe 55, and the air outlet end of the air supply pipe 55 extends to the interior of the hollow rotating shaft 52.

[0046] The motor 10 rotates, drives the second stirring assembly 7 to rotate, drives the hollow shaft 52 to rotate through the transmission assembly 9, so that the first stirring blade rotates, and the heavy metal trapping agent and the waste acid are stirred and mixed, and the precipitation efficiency is accelerated. In addition, the aerator 54 is aerated, and the gas is sent into the hollow shaft 52 through the air delivery pipe 55, and distributed through the aeration disk 56, and finally ejected by the aeration column 57, and aeration is achieved while stirring. Aeration not only enhances the stirring effect, so that the heavy metal trapping agent and the waste acid are mixed more evenly, and the oxygen provided by aeration can oxidize the reducing substances such as ferrous ions in the waste acid, and then remove them by the precipitation method, avoiding the influence on the subsequent aluminum hydroxide precipitation. By interspersing the first stirring blade 53 between a plurality of aeration columns 57, not only can the aeration effect be optimized, so that the bubbles are more evenly dispersed in the mixed solution, but also the stirring effect can be further enhanced.

[0047] Among them, the second liquid inlet component 6 includes a second pump 61, a second water pipe 62, a second venturi tube 63, a second storage tank 64, and a second suction pipe 65. The water inlet end of the second water pipe 62 extends to the lower part of the first box body, the water outlet end of the second water pipe 62 is connected to the contraction section of the second venturi tube 63, the diffusion section of the second venturi tube 63 is fixedly connected to the upper part of the left side wall of the second box body 11, the second storage tank 64 is fixed to the left side wall of the second box body 11, the top end of the second suction pipe 65 is fixedly connected to the throat of the second venturi tube 63, the bottom end of the second suction pipe 65 extends to the bottom of the second storage tank 64, and the second pump 61 is fixed to the top of the first box body 4 and is connected to the second water pipe 62.

[0048] Start the second pump 61, and pump the waste acid after heavy metal removal to the second venturi tube 63 through the second water pipe 62. When the waste acid passes through the throat of the second venturi tube 63, the flow rate is accelerated, and the pressure is reduced, forming a negative pressure, and the coagulant in the second storage tank 64 is sucked into the second venturi tube 63 through the second suction pipe 65, and mixed with the waste acid and sent to the left side of the second box 11. Since the waste acid and coagulant are first mixed in the second venturi tube 63, it is beneficial to improve the subsequent stirring and mixing efficiency. With this arrangement, there is no need for an additional dosing device, and the automatic addition of coagulant is realized directly through the water flow, and the added amount changes with the change of the water inlet flow rate, realizing the automatic matching addition of the agent, which is a clever design.

[0049] Among them, the second stirring assembly 7 includes a second bearing seat 71, a first stirring shaft 72, a second stirring blade 73, a first sealed box 74, a third bearing seat 75, a first bevel gear 76, a second bevel gear 77, a fourth bearing seat 78, a second stirring shaft 79, and a third stirring blade 710. The second bearing seat 71 is fixed to the left side of the top of the second box body 11, and the lower part of the first stirring shaft 72 passes through the second bearing seat 71 and the top wall of the second box body 11, and extends to the inside of the second box body 11 to be fixed with the second stirring blade 73, the top end of the first stirring shaft 72 is connected to the output end of the motor 10, the first sealed box 74 is fixed to the inner rear side wall of the second box body 11, and the third bearing seat 75 is fixed to the inner top wall of the first sealed box 74 The bottom end of the first stirring shaft 72 passes through the top wall of the first sealed box 74 and the third bearing seat 75, and is fixed with a first bevel gear 76. The left and right sides of the inner bottom wall of the first sealed box 74 are fixed with fourth bearing seats 78. The top of the second stirring shaft 79 is fixed with a second bevel gear 77, and the second bevel gear 77 is meshed with the first bevel gear 76. The lower part of the second stirring shaft 79 passes through the fourth bearing seat 78 and the bottom wall of the first sealed box 74, and extends to the outside of the first sealed box 74 where a third stirring blade 710 is fixed. The third stirring blade 710 is inclined, and the second stirring blade 73 is horizontally arranged. The first stirring shaft 72 and the first sealed box 74, as well as the second stirring shaft 79 and the first sealed box 74 are sealed.

[0050] The motor 10 rotates, driving the first stirring shaft 72 to rotate, so that the second stirring blade 73 rotates, and the first stirring shaft 72 drives the first bevel gear 76 to rotate, so that the second bevel gears 77 on the left and right sides rotate in the opposite direction, driving the second stirring shaft 79 to rotate in the opposite direction, so that the third stirring blade 710 rotates in the opposite direction. In this way, through the cooperation of the second stirring blade 73 and the third stirring blade 710 in opposite rotation directions, a mutual shearing and collision effect is formed, which can more effectively destroy the lumps and bubbles in the mixed liquid and promote uniform mixing. At the same time, the stirring blades in opposite directions can form a more complex flow field, increase the motion trajectory and mixing opportunities of the mixed liquid during the stirring process, thereby improving the stirring efficiency. The second stirring blade 73 and the third stirring blade 710 rotating in the opposite direction can produce stronger turbulence and eddy current effects, which help to disperse and mix the components in the mixed liquid more evenly. And it can effectively reduce the stirring dead angle. The cooperation of the horizontally arranged second stirring blade 73 and the inclined third stirring blade 710 can further enhance the shear force and vortex effect, and the inclined third stirring blade 710 can guide the flow direction of the mixed liquid, so that the mixed liquid can circulate more smoothly in the second box 11.

[0051] Among them, the third stirring component 8 includes a fifth bearing seat 81, a third stirring shaft 82, a fourth stirring blade 83, a serpentine blade 84, a second sealed box 85, a sixth bearing seat 86, a seventh bearing seat 87, a first spur gear 88, a second spur gear 89, a fourth stirring shaft 810, and a fifth stirring blade 811. The fifth bearing seat 81 is fixed to the right side of the top of the second box body 11. The third stirring shaft 82 passes through the fifth bearing seat 81 and the top wall of the second box body 11, and extends to the second box body 11 where two layers of fourth stirring blades 83 are fixed. The second sealed box 85 is fixed to the inner rear side wall of the second box body 11 between the upper and lower layers of fourth stirring blades 83. The sixth bearing seat 86 is fixed to the inner top wall of the second sealed box 85. The third stirring shaft 82 passes through the sixth bearing seat 86 and the upper and lower side walls of the second sealed box 85. The third stirring shaft 82 inside is fixed with a first spur gear 88, and the left and right side walls inside the second sealed box 85 are fixed with a seventh bearing seat 87. The top of the fourth stirring shaft 810 is fixed with a second spur gear 89, and the second spur gear 89 is meshed with the first spur gear 88. The bottom end of the fourth stirring shaft 810 passes through the seventh bearing seat 87 and the bottom wall of the second sealed box 85, and extends to the outside of the second sealed box 85 to be fixed with a fifth stirring blade 811, which is located between the upper and lower layers of the fourth stirring blade 83. The end of the fourth stirring blade 83 located in the lower layer is fixed with a vertically arranged serpentine blade 84, which is outside the outer side of the fifth stirring blade 811 and is located between the upper and lower layers of the fourth stirring blade 83. The third stirring shaft 82 and the second sealed box 85, as well as the fourth stirring shaft 810 and the second sealed box 85 are all sealed.

[0052] The first stirring shaft 72 rotates, and the third stirring shaft 82 is driven to rotate through the transmission assembly 9, so that the fourth stirring blade 83 rotates, and at the same time, the first spur gear 88 is driven to rotate, so that the second spur gears 89 on the left and right sides rotate in the opposite direction, and the fourth stirring shaft 810 on the left and right sides rotate in the opposite direction, and the fifth stirring blade 811 rotates in the opposite direction. In this way, when the fourth stirring blades 83 of the upper and lower layers rotate in the same direction, the mixed liquid can be pushed to form an up and down circulation flow in the second box 11, which is helpful for the mixing of the mixed liquid in the vertical direction. The fifth stirring blade 811 located in the middle layer rotates in the opposite direction, which can break the continuity of the flow of the mixed liquid in the upper and lower layers, so that the mixed liquid produces a stronger shear and mixing effect in the horizontal direction. And the fifth stirring blade 811 rotating in the opposite direction can be more effectively stirred to every corner inside the second box 11, reducing the dead angle of stirring and ensuring uniform mixing. When the fifth stirring blade 811 in the middle layer rotates in the opposite direction, a vortex will be formed inside the second box 11. The presence of the vortex helps the mixed liquid to be evenly distributed in the three-dimensional space in the second box 11, further improving the stirring effect. The combination of the 4th stirring blade 83 of the upper and lower layers rotating in the same direction and the 5th stirring blade 811 of the middle layer rotating in the opposite direction can greatly enhance the churning degree of the mixed solution, and this churning helps the full contact and mixing between sodium hydroxide solution and the spent acid, and improves the stirring efficiency. On this basis, by the setting of the serpentine blade 84 arranged vertically, the flow pattern of the mixed solution is changed, and the mixed solution, when flowing through the serpentine blade 84, can be affected by the shape of the serpentine blade 84, and produces more complicated flow path and turbulence effect, and this complicated flow pattern helps the more abundant mixing between sodium hydroxide solution and the spent acid. And help sodium hydroxide solution to be more evenly dispersed in the spent acid, improve stirring effect. When the mixed solution flows through the serpentine blade 84, it will be dispersed in different flow paths, so as to avoid stirring dead angle.

[0053] Among them, the transmission assembly 9 includes a double-grooved transmission wheel 91, a first transmission wheel 92, a second transmission wheel 93, a first transmission belt 94, and a second transmission belt 95. The double-grooved transmission wheel 91 is fixed to the first agitator shaft 72, the first transmission wheel 92 is fixed to the hollow rotating shaft 52, and the second transmission wheel 93 is fixed to the third agitator shaft 82. The double-grooved transmission wheel 91 and the first transmission wheel 92 are connected by the first transmission belt 94, and the double-grooved transmission wheel 91 and the second transmission wheel 93 are connected by the second transmission belt 95.

[0054] The motor 10 rotates, driving the first stirring shaft 72 to rotate, causing the double-grooved transmission wheel 91 to rotate, driving the first transmission wheel 92 to rotate through the first transmission belt 94, causing the hollow shaft 52 to rotate, and driving the second driven wheel to rotate through the second transmission belt 95, causing the third stirring shaft 82 to rotate. In this way, one-to-three is achieved, and only one motor 10 is needed to achieve the stirring operation of the first stirring component 5, the second stirring component 7, and the third stirring component 8, reducing the manufacturing cost.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Waste acid resource treatment system, characterized by: It includes a pretreatment device, a reverse osmosis device, and a bipolar membrane electrodialysis device which are sequentially arranged along the treatment direction; The supernatant liquid outlet of the pretreatment device is connected to the reverse osmosis device through a pipeline; The concentrated water outlet of the reverse osmosis device is connected to the bipolar membrane electrodialysis device through a pipeline; The alkaline solution outlet of the bipolar membrane electrodialysis device is connected to the pretreatment device through a pipeline; The pretreatment equipment includes a frame, a filter assembly, a first liquid inlet assembly, a first box, a first stirring assembly, a second liquid inlet assembly, a second box, a second stirring assembly, a third stirring assembly, a motor, and a transmission assembly; A filter assembly is disposed in the frame; The frame body is connected to the first box body via a first liquid inlet assembly; The first stirring component is disposed in the first box; The second box body has a partition plate inside, and a water passage is provided between the partition plate and the top wall of the second box body; The first box body and the second box body are connected via a second liquid inlet assembly; The motor, the second stirring assembly, and the third stirring assembly are all fixed to the top of the second box; The output end of the motor is connected to the second stirring component; The stirring end of the second stirring component extends to the interior of the second box body and is located on the left side of the partition, and the stirring end of the third stirring component extends to the interior of the second box body and is located on the right side of the partition; The second stirring component is respectively connected to the first stirring component and the third stirring component through a transmission component.

2. The waste acid resource treatment system according to claim 1, characterized in that: The water output outlet of the reverse osmosis device is connected to the recovery chamber of the bipolar membrane electrodialysis device through a pipeline; The salt solution outlet of the bipolar membrane electrodialysis device is connected to the reverse osmosis device through a pipeline.

3. The waste acid resource treatment system according to claim 1, characterized in that: The filter assembly includes a pull ring, an inclined net, a horizontal net, and a vertical net; The inclined net is placed obliquely in the frame, a pull ring is fixed on the top of the inclined net, and the pull ring is located outside the frame; A horizontal net is fixed at the bottom end of the inclined net, and the horizontal net is placed on the bottom wall of the frame; The top of the horizontal net is provided with a vertical net, and the left end of the vertical net is in contact with the left inner wall of the frame; The right side of the vertical net has a slope which is inclined from top to bottom and rightward.

4. The waste acid resource treatment system according to claim 1, characterized in that: The first liquid inlet assembly includes a first pump, a first water pipe, a first venturi tube, a first storage tank, and a first suction pipe; The water inlet end of the first water pipe is fixedly connected to the lower part of the right side wall of the frame, and the water outlet end of the first water pipe is connected to the contraction section of the first venturi tube; The diffusion section of the first venturi tube is fixedly connected to the upper part of the left side wall of the first box body; The first storage tank is fixed to the left side wall of the first box body, the top end of the first suction pipe is fixedly connected to the throat of the first venturi tube, and the bottom end of the first suction pipe extends to the bottom of the first storage tank; The first pump is fixed to the right side wall of the frame and is communicated with the first water pipe.

5. The waste acid resource treatment system according to claim 1 is characterized in that: The first stirring assembly includes a first bearing seat, a hollow rotating shaft, a first stirring blade, an aerator, an air supply pipe, an aeration disk, and an aeration column; A first bearing seat and an aerator are fixed on the top of the first box body, and the lower part of the hollow rotating shaft passes through the first bearing seat and the top wall of the first box body, and extends to the inside of the first box body where a plurality of first stirring blades are fixed; The aeration plate is fixedly connected to the lower part of the hollow rotating shaft, and the top of the aeration plate is fixedly connected to a plurality of aeration columns; The first stirring blades are divided into two layers, the upper layer of the first stirring blades being inserted between the aeration columns, and the lower layer of the first stirring blades being located below the aeration plate; The air outlet end of the aerator is fixedly connected with an air supply pipe, and the air outlet end of the air supply pipe extends to the interior of the hollow rotating shaft.

6. The waste acid resource treatment system according to claim 1 is characterized in that: The second liquid inlet assembly includes a second pump, a second water pipe, a second venturi tube, a second storage tank, and a second suction pipe; The water inlet end of the second water pipe extends to the lower part of the first box body, and the water outlet end of the second water pipe is connected to the contraction section of the second venturi tube; The diffusion section of the second venturi tube is fixedly connected to the upper side of the left side wall of the second box body; The second storage tank is fixed to the left side wall of the second box body, the top end of the second suction pipe is fixedly connected to the throat of the second venturi tube, and the bottom end of the second suction pipe extends to the bottom of the second storage tank; The second pump is fixed to the top of the first box body and is communicated with the second water pipe.

7. The waste acid resource treatment system according to claim 5, characterized in that: The second stirring assembly includes a second bearing seat, a first stirring shaft, a second stirring blade, a first sealing box, a third bearing seat, a first bevel gear, a second bevel gear, a fourth bearing seat, a second stirring shaft, and a third stirring blade; The second bearing seat is fixed to the left side of the top of the second box body, the lower part of the first stirring shaft passes through the second bearing seat and the top wall of the second box body, and extends to the inside of the second box body where a second stirring blade is fixed; The top end of the first stirring shaft is connected to the output end of the motor; The first sealed box is fixed to the inner rear side wall of the second box, and the inner top wall of the first sealed box is fixed to a third bearing seat; The bottom end of the first stirring shaft passes through the top wall of the first sealing box and the third bearing seat, and is fixed with a first bevel gear; A fourth bearing seat is fixed on both the left and right sides of the inner bottom wall of the first sealed box; A second bevel gear is fixed to the top of the second stirring shaft, the second bevel gear is meshed with the first bevel gear, and the lower part of the second stirring shaft passes through the fourth bearing seat and the bottom wall of the first sealing box, and extends to the outside of the first sealing box to be fixed with a third stirring blade; The third stirring blade is arranged obliquely, and the second stirring blade is arranged horizontally; The first stirring shaft and the first sealing box, as well as the second stirring shaft and the first sealing box are both sealed.

8. The waste acid resource treatment system according to claim 7 is characterized in that: The third stirring assembly includes a fifth bearing seat, a third stirring shaft, a fourth stirring blade, a serpentine blade, a second sealing box, a sixth bearing seat, a seventh bearing seat, a first spur gear, a second spur gear, a fourth stirring shaft, and a fifth stirring blade; The fifth bearing seat is fixed to the right side of the top of the second box body; The third stirring shaft passes through the fifth bearing seat and the top wall of the second box body, and extends into the second box body where upper and lower layers of fourth stirring blades are fixed; A second sealing box is fixed to the inner rear side wall of the second box body between the upper and lower fourth stirring blades; A sixth bearing seat is fixed to the inner top wall of the second sealed box, and the third stirring shaft passes through the sixth bearing seat and the upper and lower side walls of the second sealed box; The third stirring shaft located in the second sealing box is fixed with a first spur gear; The left and right side walls of the second sealed box are both fixed with seventh bearing seats, the top of the fourth stirring shaft is fixed with a second spur gear, the second spur gear is meshed with the first spur gear, the bottom end of the fourth stirring shaft passes through the seventh bearing seat and the bottom wall of the second sealed box, and extends to the outside of the second sealed box where a fifth stirring blade is fixed; The fifth stirring blade is located between the upper and lower fourth stirring blades; A vertically arranged serpentine blade is fixed to the end of the fourth stirring blade located at the lower layer, the serpentine blade is outside the outer side of the fifth stirring blade and is located between the upper and lower fourth stirring blades; The third stirring shaft and the second sealing box, as well as the fourth stirring shaft and the second sealing box are both sealed.

9. The waste acid resource treatment system according to claim 8, characterized in that: The transmission assembly includes a double-groove transmission wheel, a first transmission wheel, a second transmission wheel, a first transmission belt, and a second transmission belt; The double-grooved transmission wheel is fixed to the first stirring shaft, the first transmission wheel is fixed to the hollow rotating shaft, and the second transmission wheel is fixed to the third stirring shaft; The double-groove transmission wheel is connected to the first transmission wheel through a first transmission belt; The double-groove transmission wheel is connected to the second transmission wheel through a second transmission belt.

10. A waste acid resource treatment process, characterized in that: The waste acid resource treatment system according to any one of claims 1 to 9 is used for treatment, comprising the following steps: The waste acid is sent to the pretreatment equipment, filtered through the filtering component, and then the heavy metal capture agent is added while the waste acid is sent into the first box through the first liquid inlet component, and the waste acid is stirred and mixed by the first stirring component to form a heavy metal precipitate. The waste acid after heavy metal removal is sent to the left side of the second box through the second liquid inlet component, and a coagulant is added, and the waste acid is stirred and mixed by the second stirring component to form a flocculation precipitate. The upper clear liquid after coagulation treatment enters the right side of the second box through the water passage, and alkali solution is added to the right side of the second box. The hydroxide precipitate is formed, and the hydroxide precipitate is collected. The upper clear liquid is sent to the reverse osmosis equipment for concentration treatment. The concentrated water obtained by the concentration treatment is sent to the bipolar membrane electrodialysis equipment for treatment to obtain salt solution, alkali solution, and acid solution. The acid solution is reused to other sections, the alkali solution is reused to the right side of the second box, and the salt solution is reused to the reverse osmosis equipment. The produced water obtained by the concentration treatment is sent to the recovery chamber of the bipolar membrane electrodialysis equipment.

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