Neutralization reaction equipment for preparing cryolite with high molecular ratio from hydrofluoric acid wastewater

Abstract

The invention relates to the field of hydrofluoric acid wastewater recycling and retreatment, in particular to neutralization reaction equipment for preparing high-molecular-ratio cryolite from hydrofluoric acid wastewater. The neutralization reaction equipment for preparing high-molecular-ratio cryolite from hydrofluoric acid wastewater comprises a reaction kettle body, wherein a stirring unit and a cleaning unit are mounted on the reaction kettle body; the stirring unit comprises a driving part and a stirring part, the stirring part comprises a second transmission shaft, and a plurality of sections of spiral blades are fixed outside the second transmission shaft; the cleaning unit comprises a pneumatic part fixed on the reaction kettle body and a scraping part fixed on the second transmission shaft, and the scraping part rotates along with the second transmission shaft; the scraping part comprises a spiral plate, and a rubber scraping plate is fixed to the outer edge of the spiral plate. According to the neutralization reaction equipment for preparing high-molecular-ratio cryolite from hydrofluoric acid wastewater, dirt attached to the inner wall of the reaction kettle is scraped off through rotation of the spiral plate, cleaning of the interior of the reaction kettle is achieved, and cleaning is more thorough.

Description

Technical Field

[0001] The invention relates to the field of hydrofluoric acid wastewater recovery and reprocessing, and in particular to a neutralization reaction device for preparing high-molecular cryolite by using hydrofluoric acid wastewater. Background Art

[0002] Hydrofluoric acid wastewater refers to wastewater containing hydrofluoric acid or its salts. This type of wastewater usually comes from industrial production processes, especially in the fields of metal surface treatment, glass etching, semiconductor manufacturing and chemical production. Since hydrofluoric acid is highly acidic and corrosive, special attention should be paid to safety and environmental protection issues when treating this type of wastewater. At the same time, hydrofluoric acid wastewater itself can be recycled and processed to prepare cryolite, realizing resource recycling. At the same time, the treated wastewater meets the discharge standards and will not affect the environment.

[0003] For the process of recycling hydrofluoric acid wastewater and preparing cryolite, a neutralization reaction is required, that is, adding alkaline substances to the wastewater to neutralize the acidity of the wastewater. In the neutralization reaction, the reactor is the main processing equipment, that is, the wastewater is added to the reactor, and then sodium hydroxide or sodium carbonate is added to the reactor, and then the mixing of the two is promoted by stirring. However, during the mixing process, a lot of dirt will stick to the inner wall of the reactor, and due to the limitations of the structure of the reactor itself, it is very troublesome to clean the inside, which is easy to cause incomplete cleaning and affect subsequent use.

[0004] Therefore, it is necessary to provide a new neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater to solve the above technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a neutralization reaction device for preparing high molecular ratio cryolite with hydrofluoric acid wastewater.

[0006] The neutralization reaction equipment for preparing high molecular ratio cryolite from hydrofluoric acid wastewater provided by the present invention comprises a reactor body, on which a stirring unit and a cleaning unit are installed; The stirring unit includes a driving part fixed on the reactor body and a stirring part rotating inside the reactor body, the stirring part includes a second transmission shaft, and a plurality of spiral blades are fixed outside the second transmission shaft; The cleaning unit comprises a pneumatic part fixed on the reactor body and a scraping part fixed on the second transmission shaft, and the scraping part rotates along with the second transmission shaft; The scraping part comprises a spiral plate, a rubber scraper is fixed on the outer edge of the spiral plate, and the pneumatic part drives the scraping part to extend and retract radially along the reactor body, so that the rubber scraper contacts the inner wall of the reactor body.

[0007] Preferably, a plurality of supporting legs are fixed to the outer side of the reactor body, and an opening is provided at the upper end of the reactor body, and an upper end cover is fixed at the opening.

[0008] Preferably, the driving part includes a motor fixed on the upper end cover, the output end of the motor is vertically downward and is axially connected to a first transmission shaft, a driving sprocket is connected to the first transmission shaft, a driven sprocket is connected to the second transmission shaft, and a transmission chain is connected between the driving sprocket and the driven sprocket.

[0009] Preferably, the second transmission shaft has an axial cavity inside.

[0010] Preferably, the pneumatic part includes an air source device fixed on the upper end cover, a flow guide tube is fixed to the output end of the air source device, and the other end of the flow guide tube is connected to the cavity inside the second transmission shaft.

[0011] Preferably, a cover body is also fixed to the upper part of the upper end cover, a rotating joint is fixed on the cover body, the other end of the guide tube is fixed to the rotating joint, and the second transmission shaft is rotatably connected to the rotating joint, so that the guide tube and the internal cavity of the second transmission shaft are connected through the rotating joint.

[0012] Preferably, the scraping portion also includes a fixing ring fixed to the outside of the second transmission shaft, the fixing ring having a hole penetrating into the internal cavity of the second transmission shaft, a mounting frame also fixed to the outer wall of the fixing ring, a cylinder fixed to the mounting frame, a connecting hose fixed to the tail end of the cylinder, the connecting hose connecting to the internal cavity of the second transmission shaft along the hole, and an output end of the cylinder is detachably connected to the spiral plate via a connecting piece, and the contact state of the spiral plate and the rubber scraper with the reactor body is controlled by the extension and retraction of the cylinder.

[0013] Preferably, the connecting member comprises an end rod fixed to the output end of the cylinder, the other end of the end rod is provided with a hexagonal slot, a connecting seat is fixed on the spiral plate, and one end of the connecting seat is fixed with a hexagonal plug which can be plugged into the hexagonal slot; External threads are provided on the end rod and the connecting seat, and when the end rod and the connecting seat are connected by plugging, the two sections of the external threads form a completed thread, and a locking ring is also threadedly connected to the end rod, and the locking ring is fed to the connection position of the end rod and the connecting seat by rotation.

[0014] Preferably, the spiral blade and the spiral plate are both spiral-shaped, and the spiral directions are opposite.

[0015] Compared with the related art, the neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater provided by the present invention has the following beneficial effects: 1. Use the air source device to supply the cylinder pressure to control the expansion and contraction of the cylinder, and drive the spiral plate to move through the cylinder, so that the rubber scraper contacts the inner wall of the reactor. In the process of the second transmission shaft rotating, the dirt attached to the inner wall of the reactor can be scraped off, so that the inside of the reactor can be cleaned more thoroughly; 2. When the rubber scraper is not in contact with the inner wall of the reactor, the spiral plate can rotate at high speed along with the second transmission shaft. Therefore, the spiral plate can also be used as a stirring structure to enhance the stirring effect of the liquid inside the reactor and make the mixing speed of the waste liquid and alkaline substances faster; 3. The spiral directions of the spiral plate and the spiral blade are opposite. In the process of stirring the waste liquid, they can generate upward and downward thrusts on the waste liquid respectively to realize the vertical surging of the waste liquid, thereby further improving the mixing speed of the waste liquid and the alkaline substance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a preferred embodiment of a neutralization reaction device for preparing high molecular weight cryolite from hydrofluoric acid wastewater provided by the present invention; Figure 2 It is a schematic structural diagram of a cross-section of a reactor body shown in the present invention; Figure 3 It is a structural schematic diagram of the stirring unit shown in the present invention; Figure 4 A schematic diagram of the structure of the cleaning unit shown in the present invention Figure 1 ; Figure 5 A schematic diagram of the structure of the cleaning unit shown in the present invention Figure 2 ; Figure 6 A schematic diagram of the structure of the cleaning unit shown in the present invention Figure 3 .

[0017] Numbers in the figure: 1. Reactor body; 2. Support feet; 3. Upper end cover; 4. Stirring unit; 41. Motor; 42. First transmission shaft; 43. Driving sprocket; 44. Second transmission shaft; 45. Driven sprocket; 46. Transmission chain; 47. Spiral blade; 5. Cleaning unit; 51. Air source device; 52. Flow guide tube; 53. Rotary joint; 54. Fixing ring; 55. Mounting bracket; 56. Cylinder; 57. Connecting hose; 58. End rod; 59. Hexagonal slot; 510. Locking ring; 511. Connecting seat; 512. Hexagonal plug; 513. External thread; 514. Spiral plate; 515. Rubber scraper. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0020] See also Figures 1 to 6 The embodiment of the present invention provides a neutralization reaction device for preparing high molecular cryolite with hydrofluoric acid wastewater, and the neutralization reaction device for preparing high molecular cryolite with hydrofluoric acid wastewater comprises a reactor body 1, a plurality of supporting legs 2 are fixed to the outer side of the reactor body 1, an opening is provided at the upper end of the reactor body 1, an upper end cover 3 is fixed at the opening, and a stirring unit 4 and a cleaning unit 5 are installed on the reactor body 1; The stirring unit 4 includes a driving part fixed on the reactor body 1 and a stirring part rotating inside the reactor body 1; The cleaning unit 5 includes a pneumatic part fixed to the reactor body 1 and a scraping part fixed to the stirring part, and the scraping part rotates along with the stirring part; The scraping part includes a spiral plate 514 , and a rubber scraper 515 is fixed to the outer edge of the spiral plate 514 . The scraping part is driven by the pneumatic part to extend and retract along the radial direction of the reactor body 1 , so that the rubber scraper 515 contacts the inner wall of the reactor body 1 .

[0021] It should be noted that: in the device, the stirring unit 4 is used to stir the waste liquid inside the reactor body 1 to promote the mixing of the waste liquid and the alkaline substance. At the same time, the stirring unit 4 is used as a driving source to drive the cleaning unit 5 to rotate, so that the cleaning unit 5 is used to scrape the inner wall of the reactor body 1 to remove the dirt stuck on the inner wall of the reactor body 1, so that the cleaning of the inside of the reactor body 1 will be more thorough; For the cleaning unit 5, the scraping part is the main cleaning structure, which is fixed on the stirring unit 4, so the stirring unit 4 can drive the scraping part to move together; and the pneumatic part can adjust the scraping part to change the connection state between it and the reactor body 1, that is, the contact state and the non-contact state; In the contact state, it is used to clean the inside of the reactor body 1. At this time, the stirring unit 4 is preferably in a slow moving state, and during the movement, the scraping part is driven to move together to achieve the cleaning of the reactor body 1; In the non-contact state, the scraping part can move at high speed along with the stirring unit 4, thereby stirring the wastewater inside the reactor body 1, that is, the scraping part can move together as a stirring structure, thereby accelerating the mixing of the wastewater and the alkaline substance to accelerate the neutralization reaction.

[0022] In the embodiments of the present invention, please refer to Figure 3 The stirring part includes a second transmission shaft 44, and a plurality of spiral blades 47 are fixed to the outside of the second transmission shaft 44; The driving part includes a motor 41 fixed on the upper end cover 3, the output end of the motor 41 is vertically downward and is axially connected to a first transmission shaft 42, a driving sprocket 43 is connected to the first transmission shaft 42, a driven sprocket 45 is connected to the second transmission shaft 44, and a transmission chain 46 is connected between the driving sprocket 43 and the driven sprocket 45; The second transmission shaft 44 has an axial cavity inside.

[0023] It should be noted that when the stirring unit 4 is in operation, the motor 41 directly drives the first transmission shaft 42 to rotate, and a sprocket and chain transmission structure is arranged between the first transmission shaft 42 and the second transmission shaft 44, so that the second transmission shaft 44 can be directly driven to rotate, and a plurality of spiral blades 47 are arranged on the second transmission shaft 44. When the spiral blades 47 are driven to rotate, the spiral blades 47 can be used to stir the wastewater; The spiral blade 47 is vertically arranged, so during the rotation of the spiral blade 47, the wastewater can be pushed to surge in the vertical direction, and the mixing effect will be better.

[0024] In the embodiments of the present invention, please refer to Figure 4 , Figure 5 and Figure 6 The pneumatic part includes an air source device 51 fixed on the upper end cover, and a guide tube 52 is fixed to the output end of the air source device 51; a cover body is also fixed to the upper part of the upper end cover 3, and a rotary joint 53 is fixed to the cover body. The other end of the guide tube 52 is fixed to the rotary joint 53, and the second transmission shaft 44 is rotatably connected to the rotary joint 53, so that the guide tube 52 and the internal cavity of the second transmission shaft 44 are connected through the rotary joint 53; At the same time, the scraping part also includes a fixing ring 54 fixed to the outside of the second transmission shaft 44, the fixing ring 54 has a hole penetrating to the internal cavity of the second transmission shaft 44, and the outer wall of the fixing ring 54 is also fixed with a mounting frame 55, and a cylinder 56 is fixed on the mounting frame 55. A connecting hose 57 is fixed to the tail end of the cylinder 56, and the connecting hose 57 is connected to the internal cavity of the second transmission shaft 44 along the hole, and the output end of the cylinder 56 is detachably connected to the spiral plate 514 through a connecting piece, and the contact state of the spiral plate 514 and the rubber scraper 515 with the reactor body 1 is controlled by the extension and contraction of the cylinder 56; The connecting member includes an end rod 58 fixed to the output end of the cylinder 56, and the other end of the end rod 58 is provided with a hexagonal slot 59. A connecting seat 511 is fixed on the spiral plate 514, and a hexagonal plug 512 that can be plugged into the hexagonal slot 59 is fixed at one end of the connecting seat 511; External threads 513 are provided on both the end rod 58 and the connecting seat 511, and when the end rod 58 and the connecting seat 511 are connected by plugging, two sections of external threads 513 form a complete thread, and a locking ring 510 is also threadedly connected to the end rod 58, and the locking ring 510 is fed to the connection position of the end rod 58 and the connecting seat 511 by rotation.

[0025] It should be noted that: for the cleaning unit 5, the fixing ring 54 and the mounting bracket 55 are direct structures, fixed on the second transmission shaft 44, so when the second transmission shaft 44 rotates, the bracket can be driven to rotate together, and the cylinder 56 is fixed on the bracket. The spiral plate 514 is fixed at the output end of the cylinder 56 through a connecting piece, so that the spiral plate 514 can be driven to rotate. When the rubber scraper 515 contacts the inner wall of the reactor body 1, the dirt attached to the inner wall of the reactor body 1 can be scraped off, so as to clean the reactor body 1; When the spiral plate 514 is adjusted by the pneumatic part, the gas source device 51 is used as the active driving source, and the pressure inside the pipeline is adjusted by controlling the gas, so as to adjust the cylinder 56. The expansion and contraction of the cylinder 56 can drive the spiral plate 514 to adjust, thereby realizing the adjustment of the spiral plate 514. The rubber scraper 515 is the main cleaning structure, which is made of rubber material. When it contacts and scrapes the inner wall of the reactor body 1, it will not cause damage to the reactor body 1. At the same time, the price of rubber material is low, and the replacement cost is low. The cleaning unit 5 is composed of two groups, that is, two spiral plates 514, which are distributed up and down, and the lowest point of the spiral plate 514 located at the top and the highest point of the spiral plate 514 located at the bottom are preferably at the same horizontal plane, so as to ensure the comprehensive cleaning of the inner wall of the reactor body 1 and improve the cleaning effect; The setting of the rotary joint 53 satisfies the rotation of the second transmission shaft 44 and can be connected to the guide tube 52, so as to ensure that the gas can enter the internal cavity of the second transmission shaft 44, and then adjust each cylinder 56; For the installation of the spiral plate 514, it is connected to the output end of the cylinder 56 by a quick-release connector, that is, the hexagonal plug 512 on the connecting seat 511 is inserted into the hexagonal slot 59 on the end rod 58, at which time the external threads 513 on the two form a complete thread, and then the locking ring 510 is rotated to make the locking ring 510 at the connection between the connecting seat 511 and the end rod 58, thereby further limiting the two to ensure the stability of the spiral plate 514 and facilitate subsequent disassembly and replacement; The spiral plate 514 is also spiral-shaped, and when used as a stirring structure, it can push the water flow and also push part of the water flow to surge in the vertical direction.

[0026] In the embodiments of the present invention, please refer to Figure 2 The spiral blade 47 and the spiral plate 514 are both spiral-shaped, and the spiral directions are opposite.

[0027] It should be noted that the spiral blade 47 and the spiral plate 514 are both stirring structures, and their spiral directions are opposite, so they push the water flow to move in opposite directions along the vertical direction, so the stirring effect on the wastewater is better.

[0028] The specific usage process of the device is as follows: (1) Adjustment of the cleaning department; With the gas source device 51 as the driving source, the gas inside the second transmission shaft 44 is extracted through the guide tube 52, so that negative pressure is generated inside the second transmission shaft 44, thereby controlling the cylinder 56 to contract until the rubber scraper 515 is no longer in contact with the inner wall of the reactor body 1; (2) Stirring and mixing; The first transmission shaft 42 is directly driven by the motor 41 to rotate, and a sprocket and chain transmission structure is arranged between the first transmission shaft 42 and the second transmission shaft 44, so that the second transmission shaft 44 can be directly driven to rotate, and a plurality of spiral blades 47 are arranged on the second transmission shaft 44. When the spiral blades 47 are driven to rotate, the spiral blades 47 can be used to stir the wastewater; At the same time, the fixing ring 54 and the mounting frame 55 are direct structures, fixed on the second transmission shaft 44, so when the second transmission shaft 44 rotates, the bracket can be driven to rotate together, and the cylinder 56 is fixed on the bracket. The spiral plate 514 is fixed at the output end of the cylinder 56 through a connecting piece, so that the spiral plate 514 can be driven to rotate, so that the spiral blade 47 and the spiral plate 514 can be used to stir the wastewater until the wastewater and the alkaline substance are fully mixed, and the wastewater can be discharged after the neutralization reaction is completed; (3) Cleaning the inside of the reactor Reversely adjust the gas source device 51, that is, fill gas into the second transmission shaft 44 through the guide tube 52 to increase the air pressure in the internal cavity of the second transmission shaft 44, thereby controlling the extension of the cylinder 56 until the rubber scraper 515 contacts the inner wall of the reactor body 1, and then it is still necessary to drive the second transmission shaft 44 to rotate with the motor 41. At this time, the rotation speed of the second transmission shaft 44 can be reduced, so that the rubber scraper 515 can be used to clean the inside of the reactor body 1.

[0029] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A neutralization reaction device for preparing high molecular weight cryolite from hydrofluoric acid wastewater, comprising a reactor body (1), on which a stirring unit (4) and a cleaning unit (5) are installed, characterized in that: The stirring unit (4) comprises a driving part fixed on the reactor body (1) and a stirring part rotating inside the reactor body (1), the stirring part comprising a second transmission shaft (44), and a plurality of spiral blades (47) are fixed outside the second transmission shaft (44); The cleaning unit (5) comprises a pneumatic part fixed to the reactor body (1) and a scraping part fixed to the second transmission shaft (44), and the scraping part rotates along with the second transmission shaft (44); The scraping portion comprises a spiral plate (514), a rubber scraper (515) being fixed to the outer edge of the spiral plate (514), and the pneumatic portion drives the scraping portion to extend and retract radially along the reactor body (1), so that the rubber scraper (515) contacts the inner wall of the reactor body (1).

2. The neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater according to claim 1, characterized in that: A plurality of supporting legs (2) are fixed to the outer side of the reactor body (1), and an opening is provided at the upper end of the reactor body (1), and an upper end cover (3) is fixed at the opening.

3. The neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater according to claim 1, characterized in that: The driving unit comprises a motor (41) fixed on the upper end cover (3); the output end of the motor (41) is vertically downward and is axially connected to a first transmission shaft (42); a driving sprocket (43) is connected to the first transmission shaft (42); a driven sprocket (45) is connected to the second transmission shaft (44); and a transmission chain (46) is connected between the driving sprocket (43) and the driven sprocket (45).

4. The neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater according to claim 3, characterized in that: The second transmission shaft (44) has an axial cavity inside.

5. The neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater according to claim 1, characterized in that: The pneumatic part comprises an air source device (51) fixed on the upper end cover, a flow guide tube (52) being fixed to the output end of the air source device (51), and the other end of the flow guide tube (52) being connected to the cavity inside the second transmission shaft (44).

6. The neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater according to claim 1, characterized in that: A cover body is also fixed on the upper part of the upper end cover (3), a rotating joint (53) is fixed on the cover body, the other end of the guide tube (52) is fixed on the rotating joint (53), and the second transmission shaft (44) is rotatably connected to the rotating joint (53), so that the guide tube (52) and the internal cavity of the second transmission shaft (44) are connected through the rotating joint (53).

7. The neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater according to claim 1, characterized in that: The scraping portion further comprises a fixing ring (54) fixed to the outside of the second transmission shaft (44), the fixing ring (54) having a hole penetrating into the internal cavity of the second transmission shaft (44), a mounting frame (55) being fixed to the outer wall of the fixing ring (54), a cylinder (56) being fixed to the mounting frame (55), a connecting hose (57) being fixed to the tail end of the cylinder (56), the connecting hose (57) being connected to the internal cavity of the second transmission shaft (44) along the hole, and an output end of the cylinder (56) being detachably connected to the spiral plate (514) via a connecting piece, and the contact state between the spiral plate (514) and the rubber scraper (515) and the reactor body (1) is controlled by the extension and retraction of the cylinder (56).

8. The neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater according to claim 7, characterized in that: The connecting member comprises an end rod (58) fixed to the output end of the cylinder (56); the other end of the end rod (58) is provided with a hexagonal slot (59); a connecting seat (511) is fixed on the spiral plate (514); one end of the connecting seat (511) is fixed with a hexagonal plug (512) which can be plugged into the hexagonal slot (59); Both the end rod (58) and the connecting seat (511) are provided with external threads (513), and when the end rod (58) and the connecting seat (511) are connected by plugging, two sections of the external threads (513) form a complete thread, and a locking ring (510) is also threadedly connected to the end rod (58), and the locking ring (510) is fed to the connection position between the end rod (58) and the connecting seat (511) by rotation.

9. The neutralization reaction equipment for preparing high molecular weight cryolite from hydrofluoric acid wastewater according to claim 1, characterized in that: The spiral blade (47) and the spiral plate (514) are both spiral-shaped, and have opposite spiral directions.

Images