Recycling method based on discharged waste acid in quartz sand pickling process

Abstract

The invention relates to the field of quartz sand processing, in particular to a recycling method based on discharged waste acid in a quartz sand pickling process. Recycling equipment based on discharged waste acid in a quartz sand pickling process is used for dialysis operation of waste acid in a method and comprises a pure water cylinder, a dialysis cylinder and the like; the mounting frame is fixedly connected with a pure water cylinder; a dialysis cylinder is fixedly connected to the middle of the pure water cylinder; the dialysis cylinder is used for accommodating waste acid; and a pure water cavity is formed between the dialysis cylinder and the pure water cylinder. The arc-shaped diffusion dialysis membrane is arranged in a ratchet wheel shape, so that the contact area between waste acid and the diffusion dialysis membrane is increased, the dialysis efficiency is effectively improved, the contact between the diffusion dialysis membrane and the waste acid is increased in the radius extension direction of the cross section of the dialysis cylinder, and a complete boundary layer cannot be formed near the diffusion dialysis membrane; therefore, along with the upwelling waste acid, the dialysis effect of the diffusion dialysis membrane can be fully exerted, and the dialysis efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of quartz sand processing, and particularly to a method for recycling discharged waste acid in the pickling process of quartz sand. Background Art

[0002] In the production and processing of quartz sand, a large amount of hydrochloric acid and hydrofluoric acid are required to treat raw materials for removing metal impurities such as Al, Fe, Ca, Mg, K, Na, Li, B, Mn, Cu, Cr, Ni, Ti, etc. in quartz sand. The mixed waste acid of hydrochloric acid and hydrofluoric acid after use enters the wastewater treatment station for pH adjustment and defluorination treatment, and is discharged after reaching the standard. In the prior art (CN108128780A), a method for recycling pickling quartz sand mentions that metal ions in the solution are removed through the chelation of chitosan, effectively keeping the pH of the system unchanged after pickling. And (CN115040931A), a waste acid treatment process and device for quartz sand production mentions that the waste acid is filtered through an NF membrane module to achieve the purification of the acid solution. Both can treat the waste acid to achieve the effect of waste acid recycling. By using chitosan for treatment, not only does it require additional purchase of chitosan, but chitosan cannot be recycled, increasing production costs. Using NF membranes to filter waste acid is a membrane separation technology that requires power and pressure, and the water recovery rate is low. While using the membrane separation method of anionic homogeneous membranes, the anionic homogeneous membranes can not only be recycled, but also use the membrane separation technology of pressure difference to effectively control production costs and the consumption of energy resources. However, the dialysis efficiency of the anionic homogeneous membrane separation technology using pressure difference is affected by the membrane area and the boundary layer effect near the membrane (single-charge ions are enriched on one side of the anionic homogeneous membrane, and other charged ions are difficult to pass through, resulting in a decrease in membrane separation efficiency), thereby making the dialysis efficiency low and the recovery amount of free acid in the waste acid poor, restricting the production and processing efficiency of quartz sand. Summary of the Invention

[0003] In order to overcome the disadvantages in the prior art that the membrane separation technology is affected by the membrane area and the boundary layer effect, resulting in low membrane separation efficiency and poor recovery effect of free acid in waste acid, the present invention provides a method for recycling discharged waste acid in the pickling process of quartz sand.

[0004] The technical solution is as follows: A method for recycling discharged waste acid in the pickling process of quartz sand, comprising the following steps: S1. Pickle the quartz sand with hydrochloric acid and hydrofluoric acid to dissolve metal elements in the quartz sand into the mixed acid for removing metal impurities in the quartz sand; S2. Feed the mixed waste acid generated from pickling into the dialysis chamber, and perform osmotic dialysis on the waste acid through a semi-permeable membrane to filter out the free acid in the waste acid and obtain recycled acid. S3. Detect the concentration of the recycled acid and re-prepare it to increase the concentrations of hydrochloric acid and hydrofluoric acid in the recycled acid to the concentrations before pickling. S4. Feed the mixed waste acid into the secondary mixed acid tank and automatically supply it to the pickling process to achieve the purpose of recycling resources.

[0005] A recycling device for the discharged waste acid in the quartz sand pickling process, used for the waste acid dialysis operation in S2 of the above method, including a mounting frame; an anti-slip pad is provided at the lower part of the mounting frame; it also includes a pure water cylinder, a dialysis cylinder, a water inlet pipe, a drain pipe, a feed pipe, a discharge pipe, a lower partition plate, an upper partition plate and a diffusion dialysis membrane; the mounting frame is fixedly connected with the pure water cylinder; the pure water cylinder is fixedly connected with the dialysis cylinder in the middle; the dialysis cylinder is used to accommodate the waste acid; a pure water chamber is formed between the dialysis cylinder and the pure water cylinder; several dialysis windows are opened on the dialysis cylinder; the dialysis cylinder is communicated with the pure water chamber through the dialysis windows; the pure water cylinder is communicated with the water inlet pipe; the water inlet pipe is used for injecting pure water; the pure water cylinder is communicated with the drain pipe; the dialysis cylinder is communicated with the feed pipe; the feed pipe is used for injecting waste acid; both the water inlet pipe and the feed pipe are three-way pipes; the dialysis cylinder is communicated with the discharge pipe; the dialysis cylinder is fixedly connected with the lower partition plate; the dialysis cylinder is fixedly connected with the upper partition plate; several through holes are opened on both the lower partition plate and the upper partition plate; several diffusion dialysis membranes are connected to the dialysis cylinder; the diffusion dialysis membranes are used for selectively filtering the waste acid; each diffusion dialysis membrane corresponds to a dialysis window. Optionally, it also includes purlins; a purlin is fixedly connected to the edge of each dialysis window; each diffusion dialysis membrane is fixedly connected to a purlin; each diffusion dialysis membrane is located between two adjacent purlins.

[0006] Optionally, the diffusion dialysis membrane is curved.

[0007] Optionally, it also includes a hollow pipe, a motor and an impeller; the dialysis cylinder is fixedly connected with the hollow pipe; a motor is installed on the dialysis cylinder; several impellers are installed in the hollow pipe; the rotating shafts of all the impellers are jointly fixedly connected with the output shaft of the motor; several reflux ports are opened at the upper part of the hollow pipe; several through holes are opened at the lower part of the hollow pipe.

[0008] Optionally, the diameter of the through holes in the upper partition plate gradually decreases from the middle to the periphery.

[0009] Optionally, it also includes branch pipes; several branch pipes are communicated with the lower part of the hollow pipe; each branch pipe corresponds to a through hole at the lower part of the hollow pipe; several small holes are opened on the branch pipes.

[0010] Optionally, the small holes of the branch pipes are opened on the left and right sides.

[0011] Optionally, the diameter of the through holes in the lower partition plate gradually decreases from the middle to the periphery.

[0012] Optionally, it further includes a sleeve, a propeller and fan blades; the hollow tube is rotatably connected to the sleeve; the propeller is installed at the lower part of the sleeve; three fan blades are fixedly connected to the sleeve; the position of the branch pipe is staggered with the position of the through hole of the lower partition plate.

[0013] The beneficial effects of the present invention are as follows: 1. By arranging the arc-shaped diffusion dialysis membrane in a ratchet shape, the contact area between the waste acid and the diffusion dialysis membrane is increased, which not only effectively improves the dialysis efficiency. In the radial extension direction of the cross-section of the dialysis cylinder, the contact between the diffusion dialysis membrane and the waste acid increases, and a complete boundary layer will not be formed near the diffusion dialysis membrane. Therefore, with the upwelling waste acid, the dialysis function of the diffusion dialysis membrane can be fully exerted, and the dialysis efficiency can be improved.

[0014] 2. By using the impeller to force the reflux of the waste acid after dialysis treatment, the initial waste acid is diluted, the concentration of the initial waste acid is reduced, and the recovery degree of the acid in the waste acid is improved, so that the economic value of the waste acid is fully retained.

[0015] 3. The upwelling waste acid drives the propeller to rotate, and then the fan blades rotate in the dialysis cavity, driving the waste acid to move horizontally, pushing the waste acid in the middle towards the diffusion dialysis membrane, and driving the high-concentration metal cations near the diffusion dialysis membrane to move, timely destroying the boundary effect formed by the enriched metal cations near the diffusion dialysis membrane, and further improving the dialysis efficiency. Description of the Drawings

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is an internal structural schematic diagram of the pure water cylinder of the present invention; Figure 3 It is a schematic diagram of the installation position of the diffusion dialysis membrane of the present invention; Figure 4 It is a top view of the internal structure of the dialysis cylinder of the present invention; Figure 5 It is an internal structural schematic diagram of the hollow tube of the present invention; Figure 6 It is a schematic diagram of the installation position of the fan blade of the present invention.

[0017] Marks in the drawings: 1 - mounting frame, 2 - pure water cylinder, 3 - dialysis cylinder, 4 - water inlet pipe, 5 - drain pipe, 6 - feed pipe, 7 - discharge pipe, 8 - lower partition plate, 9 - upper partition plate, 10 - purlin, 11 - diffusion dialysis membrane, 12 - hollow tube, 13 - motor, 14 - branch pipe, 15 - impeller, 16 - sleeve, 17 - propeller, 18 - fan blade, 2001 - pure water cavity, 3001 - dialysis window, 1201 - reflux port. Detailed Embodiments

[0018] The following is only a preferred embodiment of the present invention, and does not limit the protection scope of the present invention accordingly.

[0019] The first embodiment A method for recycling the discharged waste acid in the quartz sand pickling process includes the following steps: S1. Pickle the quartz sand with hydrochloric acid and hydrofluoric acid to dissolve the metal elements in the quartz sand into the mixed acid. S2. Feed the mixed waste acid generated by pickling into the dialysis chamber, perform osmotic dialysis on the waste acid through a semi-permeable membrane, and obtain the recycled acid. S3. Detect the concentration of the recycled acid and re-prepare it to increase the concentrations of hydrochloric acid and hydrofluoric acid in the recycled acid to the concentrations before pickling. S4. Collect the mixed waste acid into the secondary mixed acid tank and automatically supply it to the pickling process.

[0020] A device for recycling the discharged waste acid in the quartz sand pickling process is used for the dialysis operation of the waste acid in S2 of the above method. As shown in Figures 1 - 6 , it includes a mounting frame 1; an anti-slip pad is arranged at the lower part of the mounting frame 1; It also includes a pure water cylinder 2, a dialysis cylinder 3, a water inlet pipe 4, a drain pipe 5, a feed pipe 6, a discharge pipe 7, a lower partition 8, an upper partition 9 and a diffusion dialysis membrane 11; the pure water cylinder 2 is bolted to the upper part of the mounting frame 1; the dialysis cylinder 3 is welded in the middle of the pure water cylinder 2; a pure water cavity 2001 is formed between the dialysis cylinder 3 and the pure water cylinder 2; several annularly arrayed dialysis windows 3001 are opened in the middle of the dialysis cylinder 3; the dialysis cylinder 3 is communicated with the pure water cavity 2001 through the dialysis windows 3001; the lower part of the pure water cylinder 2 is communicated with the water inlet pipe 4; the upper part of the pure water cylinder 2 is communicated with the drain pipe 5; the lower part of the dialysis cylinder 3 is communicated with the feed pipe 6; both the water inlet pipe 4 and the feed pipe 6 are three-way pipes; the upper part of the dialysis cylinder 3 is communicated with the discharge pipe 7; the lower part of the dialysis cylinder 3 is fixedly connected with the lower partition 8; the upper part of the dialysis cylinder 3 is fixedly connected with the upper partition 9; several through holes are opened on both the lower partition 8 and the upper partition 9; the dialysis cylinder 3 is connected with several diffusion dialysis membranes 11, and the diffusion dialysis membranes 11 are anion homogeneous membranes; the diffusion dialysis membranes 11 are used for selectively filtering the waste acid to separate the metal cations and free acid in the waste acid; each diffusion dialysis membrane 11 corresponds to a dialysis window 3001.

[0021] It also includes purlins 10; a purlin 10 is welded at the edge of each dialysis window 3001; each diffusion dialysis membrane 11 is fixedly connected with a purlin 10; each diffusion dialysis membrane 11 is located between two adjacent purlins 10.

[0022] The diffusion dialysis membrane 11 is curved to increase the contact area between the diffusion dialysis membrane 11 and the waste acid and improve the dialysis efficiency.

[0023] It also includes a hollow tube 12, a motor 13 and an impeller 15; a hollow tube 12 is fixedly connected to the middle of the dialysis cylinder 3; a motor 13 is installed on the upper part of the dialysis cylinder 3; four equally spaced impellers 15 are installed in the hollow tube 12; the rotating shafts of all the impellers 15 are fixedly connected to the output shaft of the motor 13 together; a plurality of reflux ports 1201 are opened in the upper part of the hollow tube 12; a plurality of through holes are opened in the lower part of the hollow tube 12.

[0024] The diameter of the through holes in the upper partition plate 9 gradually decreases from the middle to the periphery, so that the flow rate of the waste acid that has not been fully dialyzed near the hollow tube 12 is slow, which is convenient for pumping the waste acid back to the lower part of the dialysis cylinder 3 through the impeller 15.

[0025] It also includes a branch pipe 14; a plurality of branch pipes 14 distributed in an annular array are communicated with the lower part of the hollow tube 12; each branch pipe 14 corresponds to a through hole in the lower part of the hollow tube 12; a plurality of small holes are opened in the branch pipe 14.

[0026] The small holes of the branch pipe 14 are opened on the left and right sides, and are used to evenly disperse the refluxed waste acid to dilute the just-entered waste acid.

[0027] The diameter of the through holes in the lower partition plate 8 gradually decreases from the middle to the periphery, so that the flow rate of the waste acid near the edge of the dialysis cylinder 3 is accelerated, the flow rate of the waste acid is increased, the concentration of metal cations near the diffusion dialysis membrane 11 is reduced, and it is convenient for anions to pass through the diffusion dialysis membrane 11.

[0028] The working steps of this embodiment are as follows: The waste acid generated in the quartz sand pickling process is connected to the horizontal port of the feed pipe 6 through a pump, the vertical port of the feed pipe 6 is sealed, at the same time, pure water is connected to the horizontal port of the water inlet pipe 4 through a pump, the drain pipe 5 is connected to the acidity adjustment tank for recovering acid, and the discharge pipe 7 is connected to the residue tank for collecting waste acid containing a large amount of heavy metal cations. Among them, the lower partition plate 8 and the upper partition plate 9 divide the dialysis cylinder 3 into three spaces, which are the shunt cavity, the dialysis cavity and the reflux cavity from bottom to top in sequence.

[0029] The waste acid enters the shunt cavity through the feed pipe 6, and then enters the dialysis cavity through the through holes on the lower partition plate 8. After the waste acid entering the dialysis cavity contacts the diffusion dialysis membrane 11, the waste acid is filtered. The free acid in the waste acid enters the pure water, and the concentration of the waste acid decreases. After the dialysis cavity is filled, the waste acid enters the reflux cavity through the through holes on the upper partition plate 9. At this time, the motor 13 is controlled to start, synchronously driving the impeller 15 to rotate. At this time, the waste acid in the reflux cavity enters the hollow pipe 12 through the reflux port 1201. Then, the waste acid with a decreased concentration reflows to the lower part of the dialysis cavity through the lower branch pipe 14, and is mixed with the subsequently injected waste acid to reduce the concentration of the subsequently injected waste acid, thereby reducing the concentration polarization and increasing the dialysis rate of the waste acid at the diffusion dialysis membrane 11. Due to the selective permeability of the diffusion dialysis membrane 11, and the diffusion dialysis membrane 11 being an anion homogeneous membrane, the diffusion dialysis membrane 11 attracts the negatively charged hydrated ions in the waste acid and repels the positively charged hydrated ions. Under the action of the concentration difference, the anions in the waste acid are attracted and smoothly pass through the membrane pores into the pure water cavity 2001. At the same time, since anions enter the pure water in the pure water cavity 2001, the charge of the pure water is unbalanced. Therefore, the anions in the pure water attract the cations in the waste acid. And the radius of the positively charged metal cations is large, so the positively charged metal cations are difficult to pass through the diffusion dialysis membrane 11 and can only accumulate on one side of the diffusion dialysis membrane 11, thereby forming a concentration difference boundary layer. In the waste acid, in addition to the positively charged metal cations, there are also hydrogen ions that are positively charged, and the radius of the hydrogen ions is small. The hydrogen ions will be attracted by the anions on the pure water side and preferentially pass through the diffusion dialysis membrane 11. Thus, the free acid in the waste acid is separated out. Then, in order to maintain the state of low acid concentration on the pure water side, pure water is continuously and slowly introduced through the water inlet pipe 4. Then, the pure water containing the free acid is collected into the acidity adjustment pool for recycling acid through the drain pipe 5. As the waste acid is continuously injected into the dialysis cylinder 3, after dialysis, the acidity of the waste acid decreases and enters the reflux cavity. When the liquid level in the reflux cavity reaches the nozzle of the discharge pipe 7, the waste acid residue is discharged into the residue pool through the discharge pipe 7 and discharged after reaching the treatment standard.

[0030] Among them, the purlin 10, the diffusion dialysis membrane 11 and the dialysis cylinder 3 form an internal ratchet shape, and the diffusion dialysis membrane 11 is also arc-shaped, thereby increasing the contact area between the waste acid and the diffusion dialysis membrane 11, not only effectively improving the dialysis efficiency, but also compared with the diffusion dialysis membrane 11 arranged in a cylindrical shape in the prior art, in the radius extension direction of the cross-section of the dialysis cylinder 3, only the part close to the diffusion dialysis membrane 11 participates in the dialysis process. Therefore, a large amount of positively charged metal cations are enriched near the diffusion dialysis membrane 11, and the aggregated metal cations form a boundary layer near the diffusion dialysis membrane 11. As the dialysis process progresses, the thickness of the boundary layer increases, and the efficiency of anions passing through the diffusion dialysis membrane 11 decreases. By setting it in a ratchet shape, in the radius extension direction of the cross-section of the dialysis cylinder 3, the contact between the diffusion dialysis membrane 11 and the waste acid increases, and a complete boundary layer will not be formed near the diffusion dialysis membrane 11. Therefore, with the upwelling waste acid, the dialysis function of the diffusion dialysis membrane 11 can be fully exerted, and the dialysis efficiency can be improved.

[0031] At the same time, the small holes of the branch pipe 14 are opened in the horizontal direction. Therefore, the refluxed waste acid is more likely to be mixed with the upwelling initial waste acid after being ejected horizontally, thereby reducing the concentration of the initial waste acid, and enabling the refluxed waste acid to participate in the dialysis process again to fully separate the free acid in the refluxed waste acid. In addition, the diameter of the through holes of the lower partition plate 8 decreases from the middle to the periphery, so that the flow rate of the waste acid close to the diffusion dialysis membrane 11 is fast, while the flow rate of the waste acid close to the hollow pipe 12 is slow. There is a flow rate difference in the radius extension direction of the cross-section of the dialysis cylinder 3. Therefore, the waste acid close to the hollow pipe 12 will flow towards the direction close to the diffusion dialysis membrane 11, enabling the waste acid to fully contact the diffusion dialysis membrane 11, effectively improving the dialysis efficiency. Moreover, the diameter of the through holes of the upper partition plate 9 gradually decreases from the middle to the periphery, so that the flow rate of the waste acid that has not been fully dialyzed close to the hollow pipe 12 is slow, which is convenient for pumping the waste acid back to the lower part of the dialysis cylinder 3 through the impeller 15. The waste acid close to the inner wall of the reflux chamber of the dialysis cylinder 3 is closer to the inner wall of the dialysis cylinder 3, so the contact between the waste acid and the diffusion dialysis membrane 11 is more sufficient, and the free acid in the waste acid is more fully separated. Therefore, after passing through the small holes of the upper partition plate 9, the flow rate of the waste acid is relatively fast, so it is more likely to reach the upper part of the reflux chamber. Then, the waste acid is more likely to be discharged into the residual liquid pool through the discharge pipe 7. The waste acid with a low free acid concentration is separated in time, effectively improving the overall dialysis efficiency of the waste acid.

[0032] The second embodiment On the basis of the first embodiment, according to Figures 3 - 6As shown, it further includes a sleeve 16, a propeller 17 and fan blades 18; the outer surface of the hollow tube 12 is rotatably connected with the sleeve 16; the lower part of the sleeve 16 is provided with the propeller 17; the sleeve 16 is fixedly connected with three fan blades 18 distributed in an annular array; the position of the branch pipe 14 is staggered with the position of the through hole of the lower partition plate 8, and the waste acid surging from the lower partition plate 8 will not be blocked by the branch pipe 14, avoiding affecting the rotation of the propeller 17. The surging waste acid is also mixed with the waste acid flowing back on both sides of the branch pipe 14 to achieve the dilution of the waste acid.

[0033] The working steps of this embodiment are as follows: On the basis of the above embodiment, in the dialysis chamber, there is not only the surging waste acid, but also the waste acid flowing back ejected from the branch pipe 14. Therefore, a propeller 17 is arranged in the dialysis chamber, and the waste acid impacts the propeller 17, driving the propeller 17 to rotate. Thus, the sleeve 16 and its corresponding components on it are synchronously driven to rotate, realizing the rotation of the fan blades 18 in the dialysis chamber. The fan blades 18 drive the waste acid to move horizontally, making the waste acid in the middle move more towards the edge of the dialysis chamber. Looking down from above, the fan blades 18 rotate clockwise, as Figure 4 shown, pressure is applied near the diffusion dialysis membrane 11, driving the movement of the high-concentration metal cations near the diffusion dialysis membrane 11, timely destroying the boundary effect formed by the enriched metal cations near the diffusion dialysis membrane 11, making the waste acid with a low metal ion concentration approach the diffusion dialysis membrane 11. Furthermore, the anions and hydrogen ions in the waste acid can more conveniently pass through the diffusion dialysis membrane 11, further improving the dialysis efficiency. And the fan blades 18 push the waste acid towards the diffusion dialysis membrane 11. The diffusion dialysis membrane 11 is arranged in a ratchet shape, and the waste acid directly impacts the diffusion dialysis membrane 11, thereby increasing the pressure near the diffusion dialysis membrane 11 and effectively improving the dialysis efficiency.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for recycling waste acid discharged from a quartz sand pickling process, characterized in that: The method comprises the following steps: S1, pickling quartz sand with hydrochloric acid and hydrofluoric acid to dissolve metal elements in the quartz sand into the mixed acid to remove metal impurities in the quartz sand; S2, passing the mixed waste acid produced by pickling into a dialysis chamber, and performing dialysis on the waste acid through a semipermeable membrane to filter out free acid in the waste acid and obtain recovered acid; S3, testing the concentration of the recovered acid and redistributing it so that the concentrations of hydrochloric acid and hydrofluoric acid in the recovered acid are raised to the concentrations before pickling; S4. The mixed waste acid is collected into the secondary mixed acid tank and automatically supplied to the pickling process to achieve the purpose of resource recycling.

2. A recycling device for the waste acid discharged from the quartz sand pickling process, used for the waste acid dialysis operation S2 in the method of claim 1, comprising a mounting frame (1); a non-slip pad is arranged at the bottom of the mounting frame (1); a pure water cylinder (2) is fixedly connected to the mounting frame (1); a dialysis cylinder (3) is fixedly connected to the middle of the pure water cylinder (2); the dialysis cylinder (3) is used to accommodate the waste acid; a pure water cavity (2001) is formed between the dialysis cylinder (3) and the pure water cylinder (2); a plurality of dialysis windows (3001) are opened in the dialysis cylinder (3); the dialysis cylinder (3) is connected to the pure water cavity (2001) through the dialysis windows (3001); the pure water cylinder (2) is connected to a water inlet pipe (4); the water inlet The pipe (4) is used for injecting pure water; the pure water cylinder (2) is connected to a drainage pipe (5); the dialysis cylinder (3) is connected to a feed pipe (6); the feed pipe (6) is used for injecting waste acid; the water inlet pipe (4) and the feed pipe (6) are both three-way pipes; the dialysis cylinder (3) is connected to a discharge pipe (7); the dialysis cylinder (3) is fixedly connected to a lower partition (8); the dialysis cylinder (3) is fixedly connected to an upper partition (9); a plurality of through holes are formed on the lower partition (8) and the upper partition (9); the dialysis cylinder (3) is connected to a plurality of diffusion dialysis membranes (11); the diffusion dialysis membranes (11) are used for selectively filtering waste acid; each diffusion dialysis membrane (11) corresponds to a dialysis window (3001).

3. The recycling equipment for the waste acid discharged from the quartz sand pickling process according to claim 2 is characterized in that: It also includes purlins (10); each dialysis window (3001) is fixedly connected to an edge of a purlin (10); each diffusion dialysis membrane (11) is fixedly connected to a purlin (10); and each diffusion dialysis membrane (11) is located between two adjacent purlins (10).

4. The recycling equipment for the waste acid discharged from the quartz sand pickling process according to claim 3 is characterized in that: The diffusion dialysis membrane (11) is in a curved shape.

5. The recycling equipment for the waste acid discharged from the quartz sand pickling process according to claim 4 is characterized in that: The invention also comprises a hollow tube (12); the dialysis tube (3) is fixedly connected to the hollow tube (12); the dialysis tube (3) is installed with a motor (13); a plurality of impellers (15) are installed in the hollow tube (12); the rotating shafts of all the impellers (15) are fixedly connected to the output shaft of the motor (13); a plurality of reflux ports (1201) are opened at the upper part of the hollow tube (12); and a plurality of through holes are opened at the lower part of the hollow tube (12).

6. The recycling equipment for the waste acid discharged from the quartz sand pickling process according to claim 5 is characterized in that: The diameter of the through hole of the upper partition plate (9) gradually decreases from the middle to the surrounding areas.

7. The recycling equipment for the waste acid discharged from the quartz sand pickling process according to claim 6 is characterized in that: It also includes a branch pipe (14); a plurality of branch pipes (14) are connected to the lower part of the hollow pipe (12); each branch pipe (14) corresponds to a through hole in the lower part of the hollow pipe (12); and a plurality of small holes are opened on the branch pipe (14).

8. The recycling equipment for the waste acid discharged from the quartz sand pickling process according to claim 7 is characterized in that: The small holes of the branch pipe (14) are opened on the left and right sides.

9. A recycling device for the waste acid discharged from the quartz sand pickling process according to any one of claims 2 to 8, characterized in that: The diameter of the through hole of the lower partition (8) gradually decreases from the middle to the surrounding areas.

10. The recycling equipment for the waste acid discharged from the quartz sand pickling process according to claim 9 is characterized in that: It also includes a sleeve (16); the hollow tube (12) is rotatably connected to the sleeve (16); a propeller (17) is installed at the lower part of the sleeve (16); the sleeve (16) is fixedly connected to three blades (18); the position of the branch pipe (14) and the position of the through hole of the lower partition plate (8) are staggered.

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