Treatment device and method for waste liquid containing hydrofluoric acid

Abstract

The invention discloses a hydrofluoric acid-containing waste liquid treatment device and method, and particularly relates to the technical field of waste liquid treatment.The hydrofluoric acid-containing waste liquid treatment device comprises a supporting frame, an outer protection frame is fixedly mounted in the middle of the supporting frame, and a first sealing rotating part is fixedly mounted at the bottom of the inner side of the outer protection frame; a first sealing rotating part is fixedly installed at the top of the inner side of the outer protection frame, a second sealing rotating part is fixedly installed at the top of the inner side of the outer protection frame, a mixing and screening mechanism is arranged in the middle of the first sealing rotating part and the middle of the second sealing rotating part, and a treatment mechanism is arranged on the outer side of the mixing and screening mechanism. And the materials after the reaction can be centrifugally screened, so that the effective separation of solid and liquid materials after the reaction is realized, and the subsequent effective discharge of the anhydrous aluminum fluoride is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of waste liquid treatment, and in particular to a device and method for treating waste liquid containing hydrofluoric acid. Background Art

[0002] Hydrofluoric acid waste liquid mainly refers to industrial wastewater or waste liquid containing hydrofluoric acid, which usually comes from chemical production, electronics industry, metal processing and other fields. Since hydrofluoric acid waste liquid is extremely corrosive and toxic, it needs to be effectively chemically treated. The treatment of hydrofluoric acid waste liquid includes neutralization, adsorption, fluoride precipitation, acid waste conversion, evaporation concentration and incineration.

[0003] Among them, anhydrous aluminum fluoride can be prepared from hydrofluoric acid waste liquid through a fluoride precipitation chemical reaction. During the preparation, the waste liquid containing hydrofluoric acid is concentrated to reach a suitable concentration, and then the concentrated hydrofluoric acid waste liquid is mixed with an aluminum source. During the reaction process, appropriate temperature and stirring are usually required to promote reaction efficiency. After the reaction, the generated anhydrous aluminum fluoride will precipitate in the form of a solid. The separated anhydrous aluminum fluoride precipitate is collected and dried under appropriate conditions to remove moisture to obtain anhydrous aluminum fluoride. This can not only effectively treat the waste liquid containing hydrofluoric acid, but also prepare anhydrous aluminum fluoride;

[0004] However, there are still some problems in the use of the traditional device for preparing anhydrous aluminum fluoride from hydrofluoric acid waste liquid: when the hydrofluoric acid waste liquid reacts to prepare aluminum fluoride, it will cause the gas pressure to increase and cause gas leakage, affecting the surrounding working environment, and the precipitation and separation of anhydrous aluminum fluoride is relatively troublesome. Therefore, we propose a treatment device and method for hydrofluoric acid waste liquid to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a device and method for treating waste liquid containing hydrofluoric acid to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a treatment device for waste liquid containing hydrofluoric acid, comprising a support frame, an outer protective frame is fixedly installed in the middle of the support frame, a first sealing rotating part is fixedly installed on the inner bottom of the outer protective frame, a second sealing rotating part is fixedly installed on the inner top of the outer protective frame, a mixing and screening mechanism is provided in the middle of the first and second sealing rotating parts, and a treatment mechanism is provided on the outside of the mixing and screening mechanism.

[0007] As a preferred technical solution of the present invention, the mixed screening mechanism includes a screening outer cylinder, the bottom of the screening outer cylinder is fixedly installed in the middle of the first sealing rotating member, the top of the screening outer cylinder is integrally formed with a top sleeve, the top sleeve is fixedly installed in the middle of the second sealing rotating member, the inner side of the top sleeve is fixedly installed with a third sealing rotating member, the middle of the third sealing rotating member is fixedly installed with a screening inner cylinder, the outer wall of the screening inner cylinder is in contact with the inner wall of the screening outer cylinder, the bottom of the screening outer cylinder is provided with a plurality of groups of outer sieve holes evenly distributed, and the bottom of the screening inner cylinder is provided with a plurality of groups of outer sieve holes evenly distributed. Multiple groups of inner sieve holes are evenly distributed, and multiple groups of outer sieve holes and multiple groups of inner sieve holes are staggered. A top plate is fixedly installed on the inner top of the screening inner cylinder, a bearing is fixedly provided on the middle of the top plate, a stirring longitudinal rod is fixedly provided on the middle of the bearing, a stirring frame is fixedly installed on the outer side of the stirring longitudinal rod, a first motor is fixedly installed on the middle of the top end of the top plate, a driving end of the first motor and the top end of the stirring longitudinal rod are fixedly installed, a plurality of feed valves are fixedly installed on the top plate, a discharge valve is fixedly installed on the middle of the bottom end of the screening inner cylinder, and a discharge pipe is fixedly installed on the bottom end of the discharge valve.

[0008] As a preferred technical solution of the present invention, a first auxiliary seat is fixedly installed on the inner side of the top sleeve, a first auxiliary shaft is rotatably installed in the middle of the first auxiliary seat, a first gear is fixedly installed on the bottom of the first auxiliary shaft, a first gear ring corresponding to the first gear is provided on the outer top of the screening inner cylinder, the first gear and the first gear ring are meshingly connected, a second motor is fixedly installed on the top of the first auxiliary seat, and a driving end of the second motor is fixedly installed on the top of the first auxiliary shaft.

[0009] As a preferred technical solution of the present invention, a second auxiliary seat is provided at the top of the second sealing rotating member, the second auxiliary seat is fixedly mounted on the inner side of the outer protective frame, a second auxiliary shaft is rotatably mounted on the middle part of the second auxiliary seat, a second gear is fixedly mounted on the bottom of the second auxiliary shaft, a second gear ring is provided on the outer side of the top sleeve corresponding to the second gear, the second gear and the second gear ring are meshingly connected, a third motor is fixedly mounted on the top of the second auxiliary seat, and the driving end of the third motor is fixedly mounted on the top of the second auxiliary shaft.

[0010] As a preferred technical solution of the present invention, the top of the screening inner cylinder is provided with a plurality of evenly distributed exhaust inner grooves, the plurality of exhaust inner grooves are located below the third sealing rotating member, and the bottom of the top sleeve is provided with exhaust outer grooves corresponding to the exhaust inner grooves.

[0011] As a preferred technical solution of the present invention, the processing mechanism includes a bottom sealing ring, which is fixedly clamped on the inner side of the outer protective frame, and a side sealing sleeve is integrally formed in the middle of the bottom sealing ring, and the side sealing sleeve is movably sleeved on the outer side of the screening outer cylinder, and the inner wall of the side sealing sleeve is in contact with the outer wall of the screening outer cylinder, and the bottom sealing ring is located above the multiple groups of outer sieve holes, and a center ring is fixedly installed in the middle of the outer side of the side sealing sleeve, and a gas adsorption component is provided at the top of the center ring, and a plurality of evenly distributed gas guide longitudinal tubes are fixedly clamped on the center ring, and the gas guide longitudinal tubes movably penetrate the gas adsorption component, and a plurality of the gas guide longitudinal tubes extend to the bottom of the center ring. An air guide outer ring frame is formed at the top of each of the plurality of air guide longitudinal tubes, a first connecting tube corresponding to the air guide longitudinal tube is integrally formed at the bottom end of the air guide outer ring frame, the bottom end of the first connecting tube is fixedly installed with the top end of the corresponding air guide longitudinal tube, a fourth sealing rotating member is fixedly installed on the inner side of the air guide outer ring frame, an air guide inner ring frame is fixedly installed in the middle part of the fourth sealing rotating member, a plurality of second connecting tubes corresponding to the exhaust outer groove are integrally formed at the top end of the air guide inner ring frame, an air control valve is fixedly installed at the top end of the second connecting tube, a third connecting tube is fixedly installed at the top end of the air control valve, and the third connecting tube is fixedly clamped in the corresponding exhaust outer groove.

[0012] As a preferred technical solution of the present invention, a U-shaped liquid guide tube is provided at the top of the first sealing rotating part, the U-shaped liquid guide tube is fixedly connected to the outer protective frame, the top of the U-shaped liquid guide tube is located at the bottom end of the middle ring, and a liquid guide pump is fixedly installed on the U-shaped liquid guide tube.

[0013] As a preferred technical solution of the present invention, a drainage pipe is fixedly clamped on one side of the bottom sealing ring away from the U-shaped liquid guiding tube, and the end of the drainage pipe extends out of the outer protective frame and is fixedly installed with a drainage valve.

[0014] As a preferred technical solution of the present invention, an exhaust elbow is provided at the bottom end of the second sealing rotating member, and the exhaust elbow is located above the gas adsorbing member.

[0015] A method for using a device for treating waste liquid containing hydrofluoric acid comprises the following steps:

[0016] Step 1: In an initial state, multiple groups of outer sieve holes and multiple groups of inner sieve holes are staggered and distributed, the screening inner cylinder is closed, multiple feed valves are opened, concentrated hydrofluoric acid-containing waste liquid and aluminum source are introduced into the screening inner cylinder through the top plate, and the first motor is controlled to drive the stirring longitudinal rod and multiple stirring racks to rotate, thereby stirring and mixing the concentrated hydrofluoric acid-containing waste liquid and the aluminum source. After the reaction, the generated anhydrous aluminum fluoride is precipitated in the form of solid at the bottom of the screening inner cylinder, and the toxic gas generated during and before the reaction is retained at the top of the screening inner cylinder;

[0017] Step 2: After the reaction, the second motor is controlled to start driving the first auxiliary shaft to drive the first gear to control the first gear ring to rotate, thereby driving the screening inner cylinder to rotate in the screening outer cylinder, so that the multiple groups of outer sieve holes and the multiple groups of inner sieve holes correspond to each other;

[0018] Subsequently, the third motor is controlled to start driving the second auxiliary shaft to drive the second gear to control the second gear ring to rotate at high speed, thereby controlling the top sleeve, the screening outer cylinder and the screening inner cylinder to rotate at high speed, and the materials after the reaction inside the screening inner cylinder are centrifugally screened, and the liquid material is introduced into the outer protective frame through multiple groups of outer sieve holes and multiple groups of inner sieve holes, and the solid anhydrous aluminum fluoride is precipitated at the bottom of the screening inner cylinder, so as to achieve effective separation of solid and liquid materials after the reaction;

[0019] Step 3: while introducing the material in liquid form into the space between the first sealing rotating member and the bottom sealing ring in the outer protective frame through the multiple groups of outer sieve holes and the multiple groups of inner sieve holes, the liquid guide pump is controlled to start, and the material in liquid form is introduced into the space between the middle ring and the bottom sealing ring through the U-shaped liquid guide pipe;

[0020] The toxic gas generated during and before the reaction is retained at the top of the screening inner cylinder, and multiple gas control valves are controlled to open. The toxic gas is introduced between the middle ring and the bottom sealing ring through multiple third connecting pipes, second connecting pipes, gas guide inner ring frame, gas guide outer ring frame, multiple first connecting pipes, and gas guide longitudinal pipes, and then introduced into the liquid material after the reaction for reaction treatment;

[0021] After the toxic gas is reacted with the liquid material, it moves upward through the middle ring and undergoes secondary adsorption through the gas adsorption element, and then is discharged through the exhaust elbow;

[0022] After the liquid material reacts with the toxic gas, it can be discharged through the drain pipe by opening the drain valve;

[0023] Step 4: After the reaction screening and separation are completed, the discharge valve is controlled to open, and the solid anhydrous aluminum fluoride is discharged through the discharge pipe. The separated anhydrous aluminum fluoride precipitate is collected and dried under appropriate conditions to remove moisture to obtain anhydrous aluminum fluoride.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. By setting up a mixing and screening mechanism, the concentrated hydrofluoric acid-containing waste liquid and the aluminum source are effectively stirred and mixed to generate anhydrous aluminum fluoride, and the materials after the reaction can be centrifugally screened to achieve effective separation of solid and liquid materials after the reaction, which is convenient for the subsequent effective discharge of anhydrous aluminum fluoride.

[0026] 2. By setting up a mixed screening mechanism, using a processing mechanism and an external protective frame, the toxic gas can be effectively treated multiple times to prevent direct discharge or leakage caused by excessive pressure from polluting the environment, and the liquid material after the reaction can be recycled, further improving the use effect of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the structural connection of the outer and inner protection frames, the mixed screening mechanism and the processing mechanism in the present invention.

[0030] Figure 3 It is a schematic diagram of the structural connection between the mixing and screening mechanism and the processing mechanism in the present invention.

[0031] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle.

[0032] Figure 5 It is a schematic diagram of the structure of the mixed screening mechanism in the present invention.

[0033] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle.

[0034] Figure 7 It is a schematic diagram of the structural connection between the screening outer cylinder and the screening inner cylinder in the present invention.

[0035] Figure 8 It is a structural schematic diagram of the processing mechanism in the present invention.

[0036] Fig. 9 For the present invention Figure 8 Enlarged view of point C in the middle.

[0037] Fig.10 It is a schematic diagram of the structural connection between the screening outer cylinder and the processing mechanism in the present invention.

[0038] In the figure: 1, support frame; 2, outer protection frame; 21, first sealing rotating member; 22, second sealing rotating member; 3, mixed screening mechanism; 4, processing mechanism; 5, U-shaped liquid guide tube; 51, liquid guide pump; 52, liquid discharge pipe; 521, liquid discharge valve; 53, exhaust elbow; 31, screening outer cylinder; 311, top sleeve; 312, third sealing rotating member; 32, screening inner cylinder; 321, top plate; 322, feed valve; 323, discharge valve; 3231, discharge pipe; 301, outer sieve hole; 302, inner sieve hole; 303, exhaust inner groove; 304, exhaust outer groove; 33, bearing; 34, stirring longitudinal rod; 34 1. Agitator frame; 342. First motor; 35. First auxiliary seat; 351. First auxiliary shaft; 352. First gear; 3521. First gear ring; 353. Second motor; 36. Second auxiliary seat; 361. Second auxiliary shaft; 362. Second gear; 3621. Second gear ring; 363. Third motor; 41. Bottom sealing ring; 42. Side sealing sleeve; 43. Center ring; 44. Gas adsorption component; 45. Air guide longitudinal pipe; 46. Air guide outer ring frame; 461. First connecting pipe; 47. Fourth sealing rotating component; 48. Air guide inner ring frame; 481. Second connecting pipe; 49. Air control valve; 491. Third connecting pipe. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example: Figure 1-10 As shown, the present invention provides a treatment device for waste liquid containing hydrofluoric acid, including a support frame 1, an outer protective frame 2 is fixedly installed in the middle of the support frame 1, a first sealing rotating member 21 is fixedly installed on the inner bottom of the outer protective frame 2, a second sealing rotating member 22 is fixedly installed on the inner top of the outer protective frame 2, a mixing and screening mechanism 3 is provided in the middle of the first sealing rotating member 21 and the second sealing rotating member 22, the mixing and screening mechanism 3 is convenient for high-speed rotation in the outer protective frame 2, and a treatment mechanism 4 is provided on the outside of the mixing and screening mechanism 3.

[0041] The mixed screening mechanism 3 includes a screening outer cylinder 31, the bottom of the screening outer cylinder 31 is fixedly mounted on the middle of the first sealing rotating member 21, the top of the screening outer cylinder 31 is integrally formed with a top sleeve 311, the top sleeve 311 is fixedly mounted on the middle of the second sealing rotating member 22, the inner side of the top sleeve 311 is fixedly mounted with a third sealing rotating member 312, and the middle of the third sealing rotating member 312 is fixedly mounted with a screening inner cylinder 32, which is convenient for the screening inner cylinder 32 to be fixedly mounted on the screening outer cylinder 31. The outer wall of the screening inner cylinder 32 contacts the inner wall of the screening outer cylinder 31, and the bottom of the screening outer cylinder 31 is provided with multiple groups of evenly distributed outer sieve holes 301, and the bottom of the screening inner cylinder 32 is provided with multiple groups of evenly distributed inner sieve holes 302. In the initial state, the multiple groups of outer sieve holes 301 and the multiple groups of inner sieve holes 302 are staggered, and the screening inner cylinder 32 is closed. A top plate 321 is fixedly installed on the inner top of the screening inner cylinder 32. A bearing 33 is fixedly mounted in the middle, a stirring longitudinal rod 34 is fixedly mounted in the middle of the bearing 33, a stirring frame 341 is fixedly mounted on the outer side of the stirring longitudinal rod 34, a first motor 342 is fixedly mounted in the middle of the top end of the top plate 321, a driving end of the first motor 342 and the top end of the stirring longitudinal rod 34 are fixedly mounted, a plurality of feed valves 322 are fixedly mounted on the top plate 321, when in use, the plurality of feed valves 322 are opened, concentrated hydrofluoric acid-containing waste liquid and aluminum source are introduced into the screening inner cylinder 32 through the top plate 321, the first motor 342 is controlled to be turned on to drive the stirring longitudinal rod 34 and the plurality of stirring frames 341 to rotate, and then the concentrated hydrofluoric acid-containing waste liquid and the aluminum source are stirred and mixed for reaction, after the reaction, the generated anhydrous aluminum fluoride is precipitated in the bottom of the screening inner cylinder 32 in the form of solid, and the toxic gas generated during and before the reaction is retained at the top of the screening inner cylinder 32, thereby realizing effective treatment of the hydrofluoric acid-containing waste liquid;

[0042] A first auxiliary seat 35 is fixedly installed on the inner side of the top sleeve 311, a first auxiliary shaft 351 is rotatably installed in the middle of the first auxiliary seat 35, a first gear 352 is fixedly installed on the bottom of the first auxiliary shaft 351, a first gear ring 3521 corresponding to the first gear 352 is provided on the outer top of the screening inner cylinder 32, the first gear 352 and the first gear ring 3521 are meshed and connected, a second motor 353 is fixedly installed on the top of the first auxiliary seat 35, a driving end of the second motor 353 and the top of the first auxiliary shaft 351 are fixedly installed, after the reaction, the second motor 353 is controlled to start driving the first auxiliary shaft 351 to drive the first gear 352 to control the first gear ring 3521 to rotate, thereby driving the screening inner cylinder 32 to rotate in the screening outer cylinder 31, so that the multiple groups of outer sieve holes 301 and the multiple groups of inner sieve holes 302 correspond to each other;

[0043] A second auxiliary seat 36 is provided at the top of the second sealing rotating member 22, and the second auxiliary seat 36 is fixedly installed on the inner side of the outer protective frame 2. A second auxiliary shaft 361 is rotatably installed in the middle of the second auxiliary seat 36, and a second gear 362 is fixedly installed at the bottom of the second auxiliary shaft 361. A second gear ring 3621 corresponding to the second gear 362 is provided on the outer side of the top sleeve 311, and the second gear 362 is meshedly connected with the second gear ring 3621. A third motor 363 is fixedly installed at the top of the second auxiliary seat 36, and a driving end of the third motor 363 is fixedly installed at the top of the second auxiliary shaft 361. The third motor 363 is controlled to start and drive the second auxiliary shaft 361 to drive the second gear 362 to control the second gear ring 3621 to rotate at high speed, thereby controlling the top sleeve 311, the screening outer cylinder 31 and the screening inner cylinder 32 to rotate at high speed, and the materials after the reaction inside the screening inner cylinder 32 are centrifugally screened, and the liquid material is introduced into the outer protective frame 2 through multiple groups of outer sieve holes 301 and multiple groups of inner sieve holes 302, and the solid anhydrous aluminum fluoride is precipitated at the bottom of the screening inner cylinder 32, so as to realize the effective separation of solid and liquid materials after the reaction, which is convenient for the subsequent effective discharge of anhydrous aluminum fluoride.

[0044] A discharge valve 323 is fixedly installed in the middle of the bottom end of the screening inner cylinder 32, and a discharge pipe 3231 is fixedly installed at the bottom end of the discharge valve 323. After the reaction screening separation is completed, the discharge valve 323 is controlled to open, and the solid anhydrous aluminum fluoride is discharged through the discharge pipe 3231.

[0045] The top of the screening inner cylinder 32 is provided with a plurality of evenly distributed exhaust inner grooves 303, and the plurality of exhaust inner grooves 303 are located below the third sealing rotating member 312. The bottom of the top sleeve 311 is provided with exhaust outer grooves 304 corresponding to the exhaust inner grooves 303; the processing mechanism 4 includes a bottom sealing ring 41, the bottom sealing ring 41 is fixedly clamped on the inner side of the outer protection frame 2, a side sealing sleeve 42 is integrally formed in the middle of the bottom sealing ring 41, the side sealing sleeve 42 is movably sleeved on the outer side of the screening outer cylinder 31, the inner wall of the side sealing sleeve 42 is in contact with the outer wall of the screening outer cylinder 31, the bottom sealing ring 41 is located above the plurality of groups of outer sieve holes 301, and a center ring 43 is fixedly installed in the middle of the outer side of the side sealing sleeve 42;

[0046] A U-shaped liquid guide tube 5 is provided at the top of the first sealing rotating member 21. The U-shaped liquid guide tube 5 is fixedly connected to the outer protection frame 2. The top of the U-shaped liquid guide tube 5 is located at the bottom end of the middle ring 43. A liquid guide pump 51 is fixedly installed on the U-shaped liquid guide tube 5. When the liquid material is introduced into the space between the first sealing rotating member 21 and the bottom sealing ring 41 in the outer protection frame 2 through the multiple groups of outer sieve holes 301 and the multiple groups of inner sieve holes 302, the liquid guide pump 51 is controlled to be turned on to introduce the liquid material into the space between the middle ring 43 and the bottom sealing ring 41 through the U-shaped liquid guide tube 5.

[0047] A gas adsorbent 44 is provided at the top of the middle ring 43, and a plurality of evenly distributed gas guide longitudinal tubes 45 are fixedly provided on the middle ring 43. The gas guide longitudinal tubes 45 movably penetrate the gas adsorbent 44, and the plurality of gas guide longitudinal tubes 45 extend to the bottom end of the middle ring 43. A gas guide outer ring frame 46 is provided at the top of the plurality of gas guide longitudinal tubes 45. A first connecting tube 461 corresponding to the gas guide longitudinal tube 45 is integrally formed at the bottom end of the gas guide outer ring frame 46. The bottom end of the first connecting tube 461 is fixedly installed with the top end of the corresponding gas guide longitudinal tube 45. A fourth sealing rotating member 47 is fixedly installed on the inner side of the gas guide outer ring frame 46. A gas guide inner ring frame 48 is fixedly installed in the middle of the fourth sealing rotating member 47. A plurality of second connecting tubes 481 corresponding to the exhaust outer groove 304 are integrally formed at the top end of the gas guide inner ring frame 48. An air control valve 49 is fixedly installed at the end, and a third connecting pipe 491 is fixedly installed at the top of the air control valve 49. The third connecting pipe 491 is fixedly clamped in the corresponding exhaust outer groove 304. The toxic gas generated during and before the reaction is retained at the top of the screening inner cylinder 32. The multiple air control valves 49 are controlled to open, and the toxic gas is introduced into the space between the middle ring 43 and the bottom sealing ring 41 through multiple third connecting pipes 491, the second connecting pipe 481, the air guide inner ring frame 48, the air guide outer ring frame 46, the multiple first connecting pipes 461, and the air guide longitudinal pipe 45, and is passed into the liquid form material after the reaction for reaction treatment, so as to prevent the screening inner cylinder 32 from having a large amount of toxic gas and a high pressure, causing leakage and pollution to the environment, and the liquid form material after the reaction can be recycled, further improving the use effect of the entire device.

[0048] An exhaust elbow 53 is provided at the bottom end of the second sealing rotating part 22. The exhaust elbow 53 is located above the gas adsorption part 44. After the toxic gas is reacted with the liquid material, it moves upward through the middle ring 43 and is subjected to secondary adsorption treatment by the gas adsorption part 44, and then is discharged through the exhaust elbow 53, thereby realizing effective multiple treatment of the toxic gas and preventing direct discharge or leakage from causing environmental pollution.

[0049] A drain pipe 52 is fixedly provided on one side of the bottom sealing ring 41 away from the U-shaped liquid guiding tube 5. The end of the drain pipe 52 extends out of the outer side of the outer protective frame 2 and is fixedly installed with a drain valve 521. After the liquid material reacts with the toxic gas, it can be discharged through the drain pipe 52 by opening the drain valve 521.

[0050] A method for using a device for treating waste liquid containing hydrofluoric acid comprises the following steps:

[0051] Step 1: In the initial state, multiple groups of outer sieve holes 301 and multiple groups of inner sieve holes 302 are staggered, the screening inner cylinder 32 is closed, multiple feed valves 322 are opened, and concentrated hydrofluoric acid-containing waste liquid and aluminum source are introduced into the screening inner cylinder 32 through the top plate 321, and the first motor 342 is controlled to drive the stirring longitudinal rod 34 and multiple stirring racks 341 to rotate, so as to stir and mix the concentrated hydrofluoric acid-containing waste liquid and the aluminum source. After the reaction, the generated anhydrous aluminum fluoride is precipitated in the form of solid at the bottom of the screening inner cylinder 32, and the toxic gas generated during and before the reaction is retained at the top of the screening inner cylinder 32;

[0052] Step 2: After the reaction, the second motor 353 is controlled to start driving the first auxiliary shaft 351 to drive the first gear 352 to control the first gear ring 3521 to rotate, thereby driving the screening inner cylinder 32 to rotate in the screening outer cylinder 31, so that the multiple groups of outer sieve holes 301 and the multiple groups of inner sieve holes 302 correspond to each other;

[0053] Subsequently, the third motor 363 is controlled to start driving the second auxiliary shaft 361 to drive the second gear 362 to control the second gear ring 3621 to rotate at high speed, thereby controlling the top sleeve 311, the screening outer cylinder 31 and the screening inner cylinder 32 to rotate at high speed, and the materials after the reaction inside the screening inner cylinder 32 are centrifugally screened, and the liquid material is introduced into the outer protective frame 2 through multiple groups of outer sieve holes 301 and multiple groups of inner sieve holes 302, and the solid anhydrous aluminum fluoride is precipitated at the bottom of the screening inner cylinder 32, so as to achieve effective separation of solid and liquid materials after the reaction;

[0054] Step 3: While the material in liquid form is introduced into the space between the first sealing rotating member 21 and the bottom sealing ring 41 in the outer protective frame 2 through the multiple groups of outer sieve holes 301 and the multiple groups of inner sieve holes 302, the liquid guide pump 51 is controlled to start, and the material in liquid form is introduced into the space between the middle ring 43 and the bottom sealing ring 41 through the U-shaped liquid guide tube 5;

[0055] The toxic gas generated during and before the reaction is retained at the top of the screening inner cylinder 32, and the multiple gas control valves 49 are controlled to open, and the toxic gas is introduced into the space between the middle ring 43 and the bottom sealing ring 41 through multiple third connecting pipes 491, the second connecting pipe 481, the gas guiding inner ring frame 48, the gas guiding outer ring frame 46, the multiple first connecting pipes 461, and the gas guiding longitudinal pipe 45, and then introduced into the liquid material after the reaction for reaction treatment;

[0056] After the toxic gas is reacted with the liquid material, it moves upward through the middle ring 43 and is subjected to secondary adsorption by the gas adsorbent 44, and then is discharged through the exhaust elbow 53;

[0057] After the liquid material reacts with the toxic gas, it can be discharged through the drain pipe 52 by opening the drain valve 521;

[0058] Step 4: After the reaction screening and separation are completed, the discharge valve 323 is controlled to open, and the solid anhydrous aluminum fluoride is discharged through the discharge pipe 3231. The separated anhydrous aluminum fluoride precipitate is collected and dried under appropriate conditions to remove moisture to obtain anhydrous aluminum fluoride.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for treating waste liquid containing hydrofluoric acid, comprising a support frame (1), characterized in that: An outer protective frame (2) is fixedly installed in the middle of the support frame (1), a first sealing rotating member (21) is fixedly installed on the inner bottom of the outer protective frame (2), a second sealing rotating member (22) is fixedly installed on the inner top of the outer protective frame (2), a mixing and screening mechanism (3) is provided in the middle of the first sealing rotating member (21) and the second sealing rotating member (22), and a processing mechanism (4) is provided on the outer side of the mixing and screening mechanism (3).

2. A treatment device for waste liquid containing hydrofluoric acid according to claim 1, characterized in that: The mixed screening mechanism (3) comprises a screening outer cylinder (31), the bottom of the screening outer cylinder (31) is fixedly mounted on the middle of the first sealing rotating member (21), the top of the screening outer cylinder (31) is integrally formed with a top sleeve (311), the top sleeve (311) is fixedly mounted on the middle of the second sealing rotating member (22), a third sealing rotating member (312) is fixedly mounted on the inner side of the top sleeve (311), a screening inner cylinder (32) is fixedly mounted on the middle of the third sealing rotating member (312), the outer wall of the screening inner cylinder (32) is in contact with the inner wall of the screening outer cylinder (31), the bottom of the screening outer cylinder (31) is provided with a plurality of groups of outer sieve holes (301) evenly distributed, the bottom of the screening inner cylinder (32) is provided with a plurality of groups of inner sieve holes (302) evenly distributed, and the plurality of groups of outer sieve holes (301) are provided with a plurality of groups of inner sieve holes (302) evenly distributed. The holes (301) and the multiple groups of inner sieve holes (302) are staggeredly distributed; a top plate (321) is fixedly installed on the inner top of the screening inner cylinder (32); a bearing (33) is fixedly installed in the middle of the top plate (321); a stirring longitudinal rod (34) is fixedly installed in the middle of the bearing (33); a stirring frame (341) is fixedly installed on the outer side of the stirring longitudinal rod (34); a first motor (342) is fixedly installed in the middle of the top of the top plate (321); a driving end of the first motor (342) and the top of the stirring longitudinal rod (34) are fixedly installed; a plurality of feed valves (322) are fixedly installed on the top plate (321); a discharge valve (323) is fixedly installed in the middle of the bottom of the screening inner cylinder (32); and a discharge pipe (3231) is fixedly installed at the bottom of the discharge valve (323).

3. A treatment device for waste liquid containing hydrofluoric acid according to claim 2, characterized in that: A first auxiliary seat (35) is fixedly installed on the inner side of the top sleeve (311), a first auxiliary shaft (351) is rotatably installed in the middle of the first auxiliary seat (35), a first gear (352) is fixedly installed on the bottom of the first auxiliary shaft (351), a first gear ring (3521) corresponding to the first gear (352) is provided on the outer top of the screening inner cylinder (32), the first gear (352) and the first gear ring (3521) are meshingly connected, a second motor (353) is fixedly installed on the top of the first auxiliary seat (35), and a driving end of the second motor (353) is fixedly installed on the top of the first auxiliary shaft (351).

4. A treatment device for waste liquid containing hydrofluoric acid according to claim 3, characterized in that: A second auxiliary seat (36) is provided at the top end of the second sealing rotating member (22), and the second auxiliary seat (36) is fixedly mounted on the inner side of the outer protective frame (2). A second auxiliary shaft (361) is rotatably mounted in the middle of the second auxiliary seat (36), and a second gear (362) is fixedly mounted at the bottom of the second auxiliary shaft (361). A second gear ring (3621) corresponding to the second gear (362) is provided on the outer side of the top sleeve (311), and the second gear (362) and the second gear ring (3621) are meshingly connected. A third motor (363) is fixedly mounted on the top end of the second auxiliary seat (36), and a driving end of the third motor (363) is fixedly mounted on the top end of the second auxiliary shaft (361).

5. A device for treating waste liquid containing hydrofluoric acid according to claim 4, characterized in that: The top of the screening inner cylinder (32) is provided with a plurality of evenly distributed exhaust inner grooves (303), the plurality of exhaust inner grooves (303) are located below the third sealing rotating member (312), and the bottom of the top sleeve (311) is provided with exhaust outer grooves (304) corresponding to the exhaust inner grooves (303).

6. A treatment device for waste liquid containing hydrofluoric acid according to claim 5, characterized in that: The processing mechanism (4) comprises a bottom sealing ring (41), the bottom sealing ring (41) is fixedly clamped on the inner side of the outer protection frame (2), a side sealing sleeve (42) is integrally formed in the middle of the bottom sealing ring (41), the side sealing sleeve (42) is movably sleeved on the outer side of the screening outer cylinder (31), the inner wall of the side sealing sleeve (42) is in contact with the outer wall of the screening outer cylinder (31), the bottom sealing ring (41) is located above the multiple groups of outer sieve holes (301), a middle ring (43) is fixedly installed in the middle of the outer side of the side sealing sleeve (42), a gas adsorption component (44) is provided at the top of the middle ring (43), a plurality of uniformly distributed gas guide longitudinal tubes (45) are fixedly clamped on the middle ring (43), the gas guide longitudinal tubes (45) movably penetrate the gas adsorption component (44), the plurality of gas guide longitudinal tubes (45) extend to the bottom end of the middle ring (43), and the plurality of gas guide longitudinal tubes (45) extend to the bottom end of the middle ring (43). An air guide outer ring frame (46) is provided at the top end of the longitudinal tube (45); a first connecting tube (461) corresponding to the air guide longitudinal tube (45) is integrally formed at the bottom end of the air guide outer ring frame (46); the bottom end of the first connecting tube (461) is fixedly installed with the top end of the corresponding air guide longitudinal tube (45); a fourth sealing rotating member (47) is fixedly installed on the inner side of the air guide outer ring frame (46); an air guide inner ring frame (48) is fixedly installed in the middle of the fourth sealing rotating member (47); a plurality of second connecting tubes (481) corresponding to the exhaust outer groove (304) are integrally formed at the top end of the air guide inner ring frame (48); an air control valve (49) is fixedly installed at the top end of the second connecting tube (481); a third connecting tube (491) is fixedly installed at the top end of the air control valve (49); the third connecting tube (491) is fixedly clamped in the corresponding exhaust outer groove (304).

7. A treatment device for waste liquid containing hydrofluoric acid according to claim 6, characterized in that: A U-shaped liquid guiding tube (5) is provided at the top end of the first sealing rotating member (21). The U-shaped liquid guiding tube (5) is fixedly clamped on the outer protective frame (2). The top of the U-shaped liquid guiding tube (5) is located at the bottom end of the middle ring (43). A liquid guiding pump (51) is fixedly installed on the U-shaped liquid guiding tube (5).

8. The device for treating waste liquid containing hydrofluoric acid according to claim 7, characterized in that: A liquid discharge pipe (52) is fixedly mounted on one side of the bottom sealing ring (41) away from the U-shaped liquid guide tube (5); an end of the liquid discharge pipe (52) extends out of the outer side of the outer protective frame (2) and is fixedly mounted with a liquid discharge valve (521).

9. A device for treating waste liquid containing hydrofluoric acid according to claim 8, characterized in that: An exhaust elbow (53) is provided at the bottom end of the second sealing rotating member (22), and the exhaust elbow (53) is located above the gas adsorbing member (44).

10. A method for using the device for treating waste liquid containing hydrofluoric acid according to claim 9, characterized in that: The steps include: Step 1: In an initial state, the plurality of groups of outer sieve holes (301) and the plurality of groups of inner sieve holes (302) are staggered and distributed, the screening inner cylinder (32) is closed, the plurality of feed valves (322) are opened, the concentrated waste liquid containing hydrofluoric acid and the aluminum source are introduced into the screening inner cylinder (32) through the top plate (321), the first motor (342) is controlled to start and drive the stirring longitudinal rod (34) and the plurality of stirring racks (341) to rotate, and then the concentrated waste liquid containing hydrofluoric acid and the aluminum source are stirred and mixed to react, after the reaction, the generated anhydrous aluminum fluoride is precipitated in the form of solid at the bottom of the screening inner cylinder (32), and the toxic gas generated during and before the reaction is retained at the top of the screening inner cylinder (32); Step 2: After the reaction, the second motor (353) is controlled to start driving the first auxiliary shaft (351) to drive the first gear (352) to control the first gear ring (3521) to rotate, thereby driving the screening inner cylinder (32) to rotate in the screening outer cylinder (31), so that the multiple groups of outer sieve holes (301) and the multiple groups of inner sieve holes (302) correspond to each other; Subsequently, the third motor (363) is controlled to start driving the second auxiliary shaft (361) to drive the second gear (362) to control the second gear ring (3621) to rotate at high speed, thereby controlling the top sleeve (311), the screening outer cylinder (31) and the screening inner cylinder (32) to rotate at high speed, and the materials after the reaction inside the screening inner cylinder (32) are centrifugally screened, and the liquid materials are introduced into the outer protective frame (2) through multiple groups of outer sieve holes (301) and multiple groups of inner sieve holes (302), and the solid anhydrous aluminum fluoride is precipitated at the bottom of the screening inner cylinder (32), thereby achieving effective separation of solid and liquid materials after the reaction; Step 3: while the material in liquid form is introduced into the space between the first sealing rotating member (21) and the bottom sealing ring (41) in the outer protective frame (2) through the plurality of groups of outer sieve holes (301) and the plurality of groups of inner sieve holes (302), the liquid guide pump (51) is controlled to start, and the material in liquid form is introduced into the space between the middle ring (43) and the bottom sealing ring (41) through the U-shaped liquid guide tube (5); Toxic gas generated during and before the reaction is retained at the top of the screening inner cylinder (32), and a plurality of gas control valves (49) are controlled to be opened, and the toxic gas is introduced into between the middle ring (43) and the bottom sealing ring (41) through a plurality of third connecting pipes (491), a second connecting pipe (481), an inner gas guide ring frame (48), an outer gas guide ring frame (46), a plurality of first connecting pipes (461), and a gas guide longitudinal pipe (45), and then introduced into the liquid material after the reaction for reaction treatment; After the toxic gas is reacted with the liquid material, it moves upward through the middle ring (43) and passes through the gas adsorption element (44) for secondary adsorption, and then is discharged through the exhaust elbow (53); After the liquid material reacts with the toxic gas, it can be discharged through the discharge pipe (52) by opening the discharge valve (521); Step 4: After the reaction screening and separation are completed, the discharge valve (323) is controlled to open, and the solid anhydrous aluminum fluoride is discharged through the discharge pipe (3231). The separated anhydrous aluminum fluoride precipitate is collected and dried under appropriate conditions to remove moisture to obtain anhydrous aluminum fluoride.

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