CN112028284A - Device and method for removing iodine in acid wastewater of tail washing system - Google Patents
Device and method for removing iodine in acid wastewater of tail washing system Download PDFInfo
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- CN112028284A CN112028284A CN202010925152.8A CN202010925152A CN112028284A CN 112028284 A CN112028284 A CN 112028284A CN 202010925152 A CN202010925152 A CN 202010925152A CN 112028284 A CN112028284 A CN 112028284A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
Abstract
The invention relates to the technical field of wastewater iodine removal, in particular to a device and a method for removing iodine in acid wastewater of a tail washing system, wherein the device comprises a liquid inlet pipe, one end of the liquid inlet pipe is communicated with a raw material tank through a water pump, and the other end of the liquid inlet pipe is connected with bilaterally symmetrical shunt pipes, and the device has the beneficial effects that: according to the invention, equipment blockage and damage caused by iodine enrichment in a supply chain system are realized by adding the ceramic membrane, the tail washing pressure is reduced, the caustic soda and the external water consumption are greatly reduced, the water balance of the system is improved, the environmental protection risk that the tail gas emits red smoke is reduced, the quality of silicon slag and products is improved, and a raw material guarantee is provided for the development of new downstream projects; filter through setting up ceramic membrane for filter more abundant, and ceramic membrane corrosion-resistant, separation performance are good, and the infiltration capacity is big, cooperates the U-shaped pipe of bilateral symmetry simultaneously, has increased filtration efficiency, utilizes the pipeline and the vertical pipeline cooperation that the slope set up, and the contact of increase waste water and ceramic membrane realizes fully filtering.
Description
Technical Field
The invention relates to the technical field of wastewater iodine removal experiments, in particular to a device and a method for removing iodine in acid wastewater of a tail washing system.
Background
In the supply of raw material fluosilicic acid, the content of iodide ions (mainly existing in the form of hydrogen iodide) is 15-25ppm, the highest content is 25ppm, the average content is 17ppm, calculated according to the average value, the iodine amount brought into the system is about 2 tons every year, the iodine amount is unbalanced in and out due to the process characteristics of the production system, the iodide ions are continuously and circularly concentrated in the production system, the iodine content of acid liquor discharged from an alkaline tower is up to more than 120ppm, concentrated fluosilicic acid is reddened, and the production control, the product quality, the equipment corrosion and the safety environmental protection are greatly influenced due to the instable and volatile properties of the concentrated fluosilicic acid.
The existing deiodination scheme has great pollution to the environment, is complicated in process, needs to consume a large amount of chemicals, is high in cost and large in cleaning difficulty, and is not beneficial to large-batch treatment.
Therefore, the device and the method for removing iodine from the acid wastewater of the tail washing system are provided, so as to solve the problem of treatment of tail gas wastewater.
Disclosure of Invention
The invention aims to provide a device and a method for removing iodine in acid wastewater of a tail washing system, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the device comprises a liquid inlet pipe, one end of the liquid inlet pipe is communicated with a raw material tank through a water pump, the other end of the liquid inlet pipe is connected with a bilateral symmetry shunt pipe, the other ends of the bilateral symmetry shunt pipes vertically extend downwards and are communicated with a pressure increasing box, a pressure valve is arranged between the bilateral symmetry pair of pressure increasing boxes, the inner cavity of each pressure increasing box is a pressure increasing inner cavity, the lower end of each pressure increasing box is obliquely connected with an inclined pipe, the lower end of a gap between the bilateral symmetry pair of inclined pipes is transversely inserted and installed with an upper water discharging pipe, the inner cavity of each inclined pipe is obliquely inserted and installed with a first ceramic membrane, the upper end of each inclined pipe is provided with a first flange plate, the lower end of each inclined pipe is fixedly welded with a third flange plate, the lower end of each inclined pipe is vertically connected with a vertical pipe, and the lower end of a gap between the bilateral symmetry pair of vertical, the vertical grafting of the inner chamber of vertical pipe is installed the second ceramic membrane, and the equal fixed welding in upper and lower both ends of vertical pipe has the second ring flange that the size is the same, through the cooperation sealing connection of third ring flange and second ring flange between vertical pipe and the slope pipe, and the lower extreme of vertical pipe is connected with the semicircular pipe, the equal fixed welding in left and right sides opening of semicircular pipe has the fourth ring flange, and the inner chamber of semicircular pipe is provided with the annular ring inside groove of semicircle, and the lower extreme circular arc outer wall of semicircular pipe is vertical to be provided with the drain downwards.
Preferably, the inner diameter of the first flange plate is smaller than that of the third flange plate, the inner diameter of the first flange plate is equal to the outer part of the first ceramic membrane, the first flange plate is fixed at the lower end of the pressurizing box through screws, and the upper end of the first flange plate is communicated with the pressurizing inner cavity.
Preferably, the air guide pipes are transversely inserted between the pair of the left and right symmetrical pressurizing boxes, the left end and the right end of each air guide pipe are respectively communicated with the pair of the left and right symmetrical pressurizing cavities, and the upper ends of the middle sections of the air guide pipes are connected with pressure valves.
Preferably, gaps are reserved between the inner walls of the vertical pipe and the inclined pipe and the first ceramic membrane and between the inner walls of the vertical pipe and the inclined pipe and the second ceramic membrane, and the left end and the right end of the upper drainage pipe and the right end of the lower drainage pipe are respectively communicated with the gaps.
Preferably, the inner diameter of the third flange plate is larger than the outer diameter of the first ceramic membrane, a limit washer is tightly sleeved in an inner cavity of the third flange plate, the outer diameter of the limit washer is the same as the inner diameter of the third flange plate, and the inner diameter of the limit washer is smaller than the outer diameter of the lower end of the first ceramic membrane.
Preferably, a communicating pipe is vertically arranged between the upper drainage pipe and the lower drainage pipe, the upper end and the lower end of the communicating pipe are respectively communicated with the upper drainage pipe and the lower drainage pipe, and a liquid discharge port is arranged at the lower end of the middle section of the lower drainage pipe.
Preferably, a sealing washer is arranged in an inner cavity of the fourth flange plate, the inner diameter of the sealing washer is equal to the inner diameter of the inner groove of the ring, and the inner diameter of the sealing washer is smaller than the outer diameter of the second ceramic membrane.
The method for removing iodine from the acid wastewater of the tail washing system comprises the following steps:
the method comprises the following steps: preparing raw materials: firstly, installing an equipment assembly, introducing water and electrifying, then operating the equipment, checking the equipment, such as flow, leakage detection and the like, representing the water flux of the membrane, weighing about L of kg of materials, continuously adding the materials into an equipment material tank, operating the equipment, adjusting operating parameters, and inspecting the change of the flux along with time;
step two: settling the raw materials, namely standing the prepared raw materials in a raw material tank for settling to ensure that heavier impurities in the wastewater are settled to the bottom of the tank body, standing for-minutes, and pumping the wastewater at the upper end by a pressure pump;
step three: filtering by using a filter screen, wherein the filter screen is arranged on a water pumping pipeline of the pressure pump in the second step, and suspended impurities in the wastewater are fully filtered to obtain clarified wastewater;
step four: lifting by a water pump, namely lifting the filtered wastewater by using a pressure water pump so as to further improve the height potential energy of water flow, and communicating the other end of the water pump to a liquid inlet pipe;
step five: primary filtering, namely increasing the pressure in the pressurizing inner cavity through a pressure valve, enabling the wastewater to obliquely flow into the first ceramic membrane to realize primary filtering, and enabling the filtered clear liquid to flow into an upper drainage pipe;
step six: secondary filtration, wherein the wastewater filtered in the fifth step enters a second ceramic membrane in the vertical pipe, secondary clear liquid flows into a lower drainage pipe after the wastewater is fully filtered by the second ceramic membrane, and impurities such as iodine simple substances and the like after filtration enter the semi-circular ring pipe;
step seven: the unified recovery, the first clear liquid that filters collects through communicating pipe and secondary clear liquid to discharge through the leakage fluid dram, the impurity after the filtration collects through the ring inside groove and retrieves in unison through the drain.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, equipment blockage and damage caused by iodine enrichment in a supply chain system are realized by adding the ceramic membrane, the tail washing pressure is reduced, the caustic soda and the external water consumption are greatly reduced, the water balance of the system is improved, the environmental protection risk that the tail gas emits red smoke is reduced, the quality of silicon slag and products is improved, and a raw material guarantee is provided for the development of new downstream projects;
2. according to the invention, the ceramic membrane is arranged for filtering, so that the filtering is more sufficient, the ceramic membrane is corrosion-resistant, the separation performance is good, the permeation quantity is large, meanwhile, the filter efficiency is increased by matching with the bilaterally symmetrical U-shaped pipes, and the contact between the waste water and the ceramic membrane is increased by matching the obliquely arranged pipes and the vertical pipes, so that the sufficient filtering is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a semi-circular tubular structure according to the present invention;
FIG. 3 is a schematic view of the slanted tube configuration of the present invention;
FIG. 4 is a schematic view of a vertical tube configuration of the present invention;
FIG. 5 is a system flow diagram of the method of the present invention.
In the figure: 1. a liquid inlet pipe; 2. a shunt tube; 3. a pressurizing box; 4. a pressurizing inner cavity; 5. an air duct; 6. a pressure valve; 7. an inclined tube; 8. a vertical tube; 9. a semi-circular ring tube; 10. an upper drainage pipe; 11. a communicating pipe; 12. a lower drainage pipe; 13. a liquid discharge port; 14. an annular inner groove; 15. a sewage draining outlet; 16. a first ceramic film; 17. a first flange plate; 18. a second ceramic film; 19. a second flange plate; 20. a sealing gasket; 21. a third flange plate; 22. a limiting washer; 23. and a fourth flange plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, the present invention provides a technical solution:
the device and the method for removing iodine from acid wastewater of a tail washing system comprise a liquid inlet pipe 1, wherein one end of the liquid inlet pipe 1 is communicated with a raw material tank through a water pump, the other end of the liquid inlet pipe 1 is connected with bilateral symmetry shunt pipes 2, the other ends of the bilateral symmetry shunt pipes 2 vertically extend downwards to and are communicated with a pressurizing box 3, and the shunt pipes 2 are utilized to realize the shunt filtration of wastewater, so that the filtering efficiency is improved.
Be provided with pressure valve 6 between a pair of pressure boost case 3 of bilateral symmetry, the inner chamber of pressure boost case 3 sets up to pressure boost inner chamber 4, transversely peg graft between a pair of pressure boost case 3 of bilateral symmetry has air duct 5, the left and right ends of air duct 5 communicates respectively in a pair of pressure boost inner chamber 4 of bilateral symmetry, pressure valve 6 is connected to the interlude upper end of air duct 5, utilize the cooperation of pressure valve 6 and air duct 5, the realization is to pressure boost of pressure boost inner chamber 4 admitting air, reach the purpose that improves inside pressure, make waste water flow into in first ceramic membrane 16 fast.
The lower end of the pressure increasing box 3 is obliquely connected with an inclined pipe 7, the upper end of the inclined pipe 7 is provided with a first flange 17, the inner diameter of the first flange 17 is smaller than that of the third flange 21, the inner diameter of the first flange 17 is equal to that of the first ceramic membrane 16, the first flange 17 is fixed at the lower end of the pressure increasing box 3 through screws, the upper end of the first flange 17 is communicated with the pressure increasing inner cavity 4, and the first flange 17 is utilized to realize communication between the inclined pipe 7 and the pressure increasing box 3.
The lower extreme fixed welding of inclined tube 7 has third ring flange 21, and the upper and lower both ends of vertical pipe 8 all fixed welding have the same second ring flange 19 of size, through the cooperation sealing connection of third ring flange 21 with second ring flange 19 between vertical pipe 8 and the inclined tube 7, utilizes the cooperation of third ring flange 21 and second ring flange 19 to realize the sealing connection of vertical pipe 8 and inclined tube 7.
The inner chamber slope of slope pipe 7 is pegged graft and is had first ceramic membrane 16, and the lower extreme of slope pipe 7 is vertical to be connected with vertical pipe 8, and second ceramic membrane 18 is installed in the vertical grafting of the inner chamber of vertical pipe 8, utilizes the first ceramic membrane 16 increase rivers' of slope infiltration time to increase infiltration efficiency realizes abundant filtration, cooperates second ceramic membrane 18 further to filter, reaches the purpose of abundant filtration separation.
The inner diameter of the third flange disc 21 is larger than the outer diameter of the first ceramic membrane 16, a limit gasket 22 is tightly sleeved in an inner cavity of the third flange disc 21, the outer diameter of the limit gasket 22 is the same as the inner diameter of the third flange disc 21, the inner diameter of the limit gasket 22 is smaller than the outer diameter of the lower end of the first ceramic membrane 16, the first ceramic membrane 16 is sealed and fixed by limiting the inner diameter of the third flange disc 21, and the inclined tube 7 is sealed with the vertical tube 8 in a connecting position by matching with the limit gasket 22.
The upper drain pipe 10 is transversely installed in an inserting mode at the lower end of a gap between a pair of bilaterally symmetrical inclined pipes 7, the lower drain pipe 12 parallel to the upper drain pipe 10 is arranged at the lower end of the gap between a pair of bilaterally symmetrical vertical pipes 8, the communicating pipe 11 is vertically arranged between the upper drain pipe 10 and the lower drain pipe 12, the upper end and the lower end of the communicating pipe 11 are respectively communicated with the upper drain pipe 10 and the lower drain pipe 12, a liquid discharge port 13 is formed in the lower end of the middle section of the lower drain pipe 12, gaps are reserved between the inner walls of the vertical pipes 8 and the inclined pipes 7 and the first ceramic membrane 16 and between the inner walls of the vertical pipes 8 and the second ceramic membrane 18, the left end and the right end of the upper drain pipe 10 and the left end and the right end of the lower drain pipe 12 are respectively communicated with.
The lower extreme of vertical pipe 8 is connected with semi-circular ring pipe 9, the equal fixed welding of left and right sides opening of semi-circular ring pipe 9 has fourth ring flange 23, the inner chamber of fourth ring flange 23 is provided with seal ring 20, seal ring 20's internal diameter equals the internal diameter of ring inside groove 14, seal ring 20's internal diameter is less than the external diameter of second ceramic membrane 18, utilize seal ring 20 to realize the sealing connection between vertical pipe 8 and the semi-circular ring pipe 9, through the internal diameter of injecing seal ring 20, thereby the clear solution after avoiding permeating is revealed.
The inner cavity of the semi-circular ring pipe 9 is provided with a semi-circular ring inner groove 14, the outer wall of the lower end arc of the semi-circular ring pipe 9 is vertically and downwards provided with a sewage discharge outlet 15, and the sewage discharge outlet 15 and the ring inner groove 14 are utilized to realize the unified recovery of the filtered concentrated solution.
The method for removing iodine from the acid wastewater of the tail washing system comprises the following steps:
the method comprises the following steps: preparing raw materials: firstly, installing an equipment component, introducing water and electrifying, then operating the equipment, checking the equipment, such as flow, leakage detection and the like, representing the water flux of the membrane, weighing about 50L of 50kg of material, continuously adding the material into an equipment material tank, operating the equipment, adjusting operating parameters, and observing the change of the flux along with time;
step two: precipitating the raw materials, namely standing and precipitating the prepared raw materials in a raw material tank to precipitate heavier impurities in the wastewater to the bottom of the tank body, standing for 10-25 minutes, and pumping the wastewater at the upper end by a pressure pump;
step three: filtering by using a filter screen, wherein the filter screen is arranged on a water pumping pipeline of the pressure pump in the second step, and suspended impurities in the wastewater are fully filtered to obtain clarified wastewater;
step four: lifting by a water pump, namely lifting the filtered wastewater by using a pressure water pump so as to further improve the height potential energy of water flow, and communicating the other end of the water pump to a liquid inlet pipe 1;
step five: primary filtering, namely increasing the pressure in the pressurizing inner cavity 4 through the pressure valve 6, enabling the wastewater to obliquely flow into the first ceramic membrane 16 to realize primary filtering, and enabling the filtered clear liquid to flow into the upper drainage pipe 10;
step six: secondary filtration, wherein the wastewater filtered in the fifth step enters a second ceramic membrane 18 in the vertical pipe 8, secondary clear liquid flows into the lower drainage pipe 12 after the wastewater is fully filtered by the second ceramic membrane 18, and impurities such as iodine simple substances and the like after filtration enter the semi-circular pipe 9;
step seven: and uniformly recovering, collecting the primary filtered clear liquid and the secondary clear liquid through a communicating pipe 11, discharging through a liquid outlet 13, collecting the filtered impurities through an annular inner groove 14, and uniformly recovering through a sewage outlet 15.
The working principle is as follows: the first flange plate 17 is used for communicating the inclined pipe 7 with the pressure increasing box 3, the third flange plate 21 is used for being matched with the second flange plate 19 to achieve sealing connection between the vertical pipe 8 and the inclined pipe 7, the inner diameter of the third flange plate 21 is limited, sealing fixation of the first ceramic membrane 16 is achieved, the limit gasket 22 is matched to achieve sealing between the connecting positions of the inclined pipe 7 and the vertical pipe 8, the sealing connection between the vertical pipe 8 and the semicircular pipe 9 is achieved through the sealing gasket 20, the inner diameter of the sealing gasket 20 is limited, and accordingly leakage of penetrating clear liquid is avoided.
Then the raw materials that will prepare are stood in raw materials material jar and are precipitated for heavier impurity deposits to the bottom of jar body in the waste water, after 10-25 minutes of stewing, draws upper end waste water through the pressure pump, installs the filter screen on the pipeline that draws water of pressure pump, and suspension impurity in the abundant filtration waste water obtains clear waste water, utilizes shunt tubes 2 to realize the reposition of redundant personnel of waste water and filters, thereby improves filtration efficiency.
Utilize the cooperation of pressure valve 6 and air duct 5, realize the pressure boost of admitting air to pressure boost inner chamber 4, reach the purpose that improves inside pressure for waste water flows into first ceramic membrane 16 fast in, utilizes the first ceramic membrane 16 increase rivers' of slope infiltration time, thereby increases the infiltration efficiency, realizes abundant filtration, cooperates second ceramic membrane 18 further to filter, reaches the purpose of abundant filtration separation.
The clear liquid after the permeation filtration is collected by the matching of the communicating pipe 11, the upper drainage pipe 10 and the lower drainage pipe 12, so that the uniform recovery is realized by the liquid discharge port 13, and the uniform recovery of the concentrated liquid after the filtration is realized by the sewage discharge port 15 and the circular inner groove 14.
Wherein the pressure pump and the pressure valve 6 are common devices in the field and are not described in detail.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The device and the method for removing iodine from acid wastewater of a tail washing system comprise a liquid inlet pipe (1), and are characterized in that: one end of the liquid inlet pipe (1) is communicated with a raw material tank through a water pump, the other end of the liquid inlet pipe (1) is connected with a bilateral symmetry shunt pipe (2), the other ends of the bilateral symmetry shunt pipes (2) vertically extend downwards and are communicated with a pressurizing box (3), a pressure valve (6) is arranged between the bilateral symmetry pressurizing box (3), the inner cavity of the pressurizing box (3) is set as a pressurizing inner cavity (4), the lower end of the pressurizing box (3) is obliquely connected with an inclined pipe (7), the lower end of a gap between the bilateral symmetry pair of inclined pipes (7) is transversely inserted with an upper water discharging pipe (10), the inner cavity of the inclined pipe (7) is obliquely inserted with a first ceramic membrane (16), the upper end of the inclined pipe (7) is provided with a first flange (17), the lower end of the inclined pipe (7) is fixedly welded with a third flange (21), and the lower end of the inclined pipe (7) is vertically connected with a, bilateral symmetry's a pair of clearance lower extreme between vertical pipe (8) is provided with lower drain pipe (12) parallel with last drain pipe (10), and second ceramic membrane (18) are installed in the vertical grafting of the inner chamber of vertical pipe (8), and the equal fixed welding in upper and lower both ends of vertical pipe (8) has second ring flange (19) that the size is the same, through the cooperation sealing connection of third ring flange (21) with second ring flange (19) between vertical pipe (8) and inclined tube (7), the lower extreme of vertical pipe (8) is connected with semicircular pipe (9), the equal fixed welding in left and right sides opening of semicircular pipe (9) has fourth ring flange (23), and the inner chamber of semicircular pipe (9) is provided with the annular ring inside groove of semicircle (14), and the lower extreme circular arc outer wall of semicircular pipe (9) is vertical downwards to be provided with drain (15).
2. The apparatus and method for removing iodine from acidic wastewater in tail washing system according to claim 1, wherein: the inner diameter of the first flange plate (17) is smaller than that of the third flange plate (21), the inner diameter of the first flange plate (17) is equal to the external connection of the first ceramic membrane (16), the first flange plate (17) is fixed at the lower end of the pressurizing box (3) through screws, and the upper end of the first flange plate (17) is communicated with the pressurizing inner cavity (4).
3. The apparatus and method for removing iodine from acidic wastewater in tail washing system according to claim 1, wherein: air guide pipes (5) are transversely inserted between the pair of bilaterally symmetrical pressurizing boxes (3), the left end and the right end of each air guide pipe (5) are respectively communicated with the pair of bilaterally symmetrical pressurizing cavities (4), and the upper end of the middle section of each air guide pipe (5) is connected with a pressure valve (6).
4. The apparatus and method for removing iodine from acidic wastewater in tail washing system according to claim 1, wherein: gaps are reserved between the inner walls of the vertical pipe (8) and the inclined pipe (7) and the first ceramic membrane (16) and the second ceramic membrane (18), and the left end and the right end of the upper drainage pipe (10) and the right end of the lower drainage pipe (12) are respectively communicated with the gaps.
5. The apparatus and method for removing iodine from acidic wastewater in tail washing system according to claim 1, wherein: the inner diameter of the third flange plate (21) is larger than the outer diameter of the first ceramic membrane (16), a limiting gasket (22) is tightly sleeved in an inner cavity of the third flange plate (21), the outer diameter of the limiting gasket (22) is the same as the inner diameter of the third flange plate (21), and the inner diameter of the limiting gasket (22) is smaller than the outer diameter of the lower end of the first ceramic membrane (16).
6. The apparatus and method for removing iodine from acidic wastewater in tail washing system according to claim 1, wherein: a communicating pipe (11) is vertically arranged between the upper drain pipe (10) and the lower drain pipe (12), the upper end and the lower end of the communicating pipe (11) are respectively communicated with the upper drain pipe (10) and the lower drain pipe (12), and a liquid discharge port (13) is arranged at the lower end of the middle section of the lower drain pipe (12).
7. The apparatus and method for removing iodine from acidic wastewater in tail washing system according to claim 1, wherein: and a sealing washer (20) is arranged in the inner cavity of the fourth flange plate (23), the inner diameter of the sealing washer (20) is equal to that of the circular ring inner groove (14), and the inner diameter of the sealing washer (20) is smaller than the outer diameter of the second ceramic membrane (18).
8. The method for removing iodine from acid wastewater in tail washing system according to claim 1, characterized in that the method comprises the following steps:
the method comprises the following steps: preparing raw materials: firstly, installing an equipment component, introducing water and electrifying, then operating the equipment, checking the equipment, such as flow, leakage detection and the like, representing the water flux of a membrane, weighing 50kg (about 50L) of materials, continuously adding the materials into an equipment material tank, operating the equipment, adjusting operating parameters, and observing the change of the flux along with time;
step two: precipitating the raw materials, namely standing and precipitating the prepared raw materials in a raw material tank to precipitate heavier impurities in the wastewater to the bottom of the tank body, standing for 10-25 minutes, and pumping the wastewater at the upper end by a pressure pump;
step three: filtering by using a filter screen, wherein the filter screen is arranged on a water pumping pipeline of the pressure pump in the second step, and suspended impurities in the wastewater are fully filtered to obtain clarified wastewater;
step four: lifting by a water pump, namely lifting the filtered wastewater by using a pressure water pump so as to further lift the height potential energy of water flow, and communicating the other end of the water pump to a liquid inlet pipe (1);
step five: primary filtration, wherein the pressure in the pressurizing inner cavity (4) is increased through a pressure valve (6), wastewater obliquely flows into a first ceramic membrane (16) to realize primary filtration, and filtered clear liquid flows into an upper drainage pipe (10);
step six: secondary filtration, wherein the wastewater filtered in the fifth step enters a second ceramic membrane (18) in the vertical pipe (8), secondary clear liquid flows into a lower drainage pipe (12) after the wastewater is fully filtered by the second ceramic membrane (18), and impurities such as iodine simple substances and the like after filtration enter a semi-circular ring pipe (9);
step seven: and uniformly recovering, collecting the primary filtered clear liquid and the secondary clear liquid through a communicating pipe (11), discharging through a liquid outlet (13), and collecting the filtered impurities through an annular inner groove (14) and uniformly recovering through a sewage outlet (15).
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