Purifying pond for removing fluorine from wastewater

Abstract

The utility model discloses a purification tank for waste water defluorination, and relates to the technical field of fluorine-containing waste water treatment, the purification tank comprises a preliminary filter tank, a reaction tank, a sedimentation tank and a deep filter tank, a filter device is arranged in the preliminary filter tank, through the design of filter screens with different pore diameters, the waste water filter efficiency can be effectively improved, the filter screens are prevented from being blocked, and meanwhile, the deep filter tank is arranged in the reaction tank. The filter screen is driven by a servo motor to move up and down, so that regular cleaning of the filter screen can be realized, a stirring device is arranged in the reaction tank, a stirring rod, a liquid storage tank, stirring blades and a water outlet are mounted on the stirring device, the stirring rod is driven by the servo motor to rotate, and a defluorination agent flows out from a fifth water outlet. The device can accelerate the mixing of the defluorination agent and the fluorine-containing wastewater, accelerate the chemical reaction rate and improve the purification efficiency of the fluorine-containing wastewater, a heating device is arranged in the sedimentation tank, and the proper temperature is controlled through a temperature regulating valve, so that the sedimentation speed of calcium fluoride can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fluorine-containing wastewater treatment, and particularly relates to a purification tank for removing fluorine from wastewater. BACKGROUND

[0002] Fluorine has special chemical properties and is widely used in many industrial processes, which also makes fluorine-containing wastewater more common. In the ironmaking link of the steel industry production, fluorite (CaF2) will decompose and release fluoride ions into wastewater, producing fluorine-containing wastewater. In the aluminum electrolysis industry, cryolite is used as the main electrolyte, which will undergo a series of complex chemical reactions, and part of the fluorides will volatilize and dissolve in the circulating cooling water, producing fluorine-containing wastewater. In the etching process of the semiconductor manufacturing and other electronic industries, fluorine-containing chemicals such as hydrofluoric acid etching agent are used to react with materials such as silicon wafers to remove unwanted material layers, thereby manufacturing integrated circuits and other electronic components. The use of fluorine-containing etching agents will generate a large amount of fluorine-containing wastewater.

[0003] Fluorine-containing wastewater can pollute surface water, leading to a decrease in the water quality of rivers, lakes and other water bodies. Long-term contact with high-fluorine soil can also cause soil fertility to decline, affecting the sustainable development of agricultural production. For the human body, long-term consumption of water with excessive fluorine content can cause dental fluorosis and skeletal fluorosis.

[0004] Currently, the design of the purification tank for fluorine-containing wastewater treatment for adding defluorination reagent is through the opening of a notch, which leads to a slow chemical reaction between the defluorination reagent and the fluorine-containing wastewater, affecting the precipitation of calcium fluoride and reducing the purification efficiency of the fluorine-containing wastewater. There are few designs in the sedimentation tank to accelerate the precipitation of calcium fluoride, and the precipitation of calcium fluoride is slow, which greatly affects the purification efficiency of the fluorine-containing wastewater. In the preliminary filtration of the fluorine-containing wastewater, the diameter of the impurities in the wastewater is not detected, and the pore size of the filter screen is not reasonably designed, which leads to a low filtration efficiency or a clogging of the filter screen, affecting the filtration efficiency of the fluorine-containing wastewater. SUMMARY

[0005] The utility model aims at providing a purification tank for removing fluorine from wastewater, which solves the following technical problems: the design of the purification tank for fluorine-containing wastewater treatment for adding defluorination reagent is through the opening of a notch, which leads to a slow chemical reaction between the defluorination reagent and the fluorine-containing wastewater, affecting the precipitation of calcium fluoride and reducing the purification efficiency of the fluorine-containing wastewater. There are few designs in the sedimentation tank to accelerate the precipitation of calcium fluoride, and the precipitation of calcium fluoride is slow, which greatly affects the purification efficiency of the fluorine-containing wastewater. In the preliminary filtration of the fluorine-containing wastewater, the diameter of the impurities in the wastewater is not detected, and the pore size of the filter screen is not reasonably designed, which leads to a low filtration efficiency or a clogging of the filter screen, affecting the filtration efficiency of the fluorine-containing wastewater.

[0006] The utility model can achieve the purpose by the following technical solutions:

[0007] The utility model provides a kind of purification tank for wastewater defluorination, including fluorine-containing wastewater purification tank, the fluorine-containing wastewater purification tank is divided into preliminary filter, reaction tank, sedimentation tank and depth filter tank by partition, the upper portion of the preliminary filter is provided with water inlet valve, the inside of the preliminary filter is equipped with filter device, the filter device is used to carry out preliminary filtration to the suspended particulate impurities in fluorine-containing wastewater, the lower end of the preliminary filter is equipped with first water outlet, one end of the first water outlet is connected with pressure pump, one end of the pressure pump is connected with drain pipe, the other end of the drain pipe is connected to the upper end of reaction tank, the bottom of the preliminary filter is equipped with first blow-off, the upper end of the reaction tank is equipped with first water inlet, the central axis of the upper end of the reaction tank is provided with defluorination reagent feeder, control valve is fixedly arranged on the defluorination reagent feeder, the inside of the reaction tank is provided with stirring device, the stirring device is used to carry out the rapid stirring mixing of fluorine-containing wastewater and defluorination reagent, the bottom of the reaction tank is equipped with second water outlet, the second water outlet is connected to the upper end of sedimentation tank by drain pipe, the upper end of the sedimentation tank is equipped with second water inlet, the inside of the sedimentation tank is provided with heating device, the heating device is used to heat the calcium fluoride solution after stirring mixing, the bottom of the inside of the sedimentation tank is provided with arc groove, the outside of the sedimentation tank is equipped with third water outlet, the lower part of the third water outlet is equipped with second blow-off.

[0008] As a further scheme of the utility model: the depth filter tank side wall is provided with T-shaped water valve, the depth filter tank upper end is equipped with third water inlet, the depth filter tank is provided with active alumina filter layer in its inside, the depth filter tank side is equipped with fourth water outlet, one end of the T-shaped water valve is connected with third water inlet, the other end is connected with fourth water outlet, fluorine content detection device is arranged between the T-shaped water valve and third water inlet.

[0009] As a further scheme of the utility model: the stirring device includes the stirring frame fixedly installed on reaction tank, the first servo motor is fixedly installed on the stirring frame, the output shaft of the first servo motor is installed with driving gear, the side wall of the driving gear is provided with transmission gear meshed with it, the stirring rod is fixedly sleeved on the transmission gear, the upper portion of the stirring rod is rotatably connected with liquid storage tank, the liquid storage tank is connected with defluorination reagent feeder, the stirring rod is fixedly provided with stirring paddle, a plurality of fifth water outlets are formed in the stirring paddle.

[0010] As a further scheme of the present application: the filtering device comprises a second servo motor fixedly installed on the upper two sides of the preliminary filtering pool, a lead screw is fixedly installed on the output shaft of the second servo motor, two sliding blocks are sleeved on the lead screw, a coarse filter screen and a medium filter screen are respectively installed on the two sliding blocks, the coarse filter screen is used for preliminarily filtering the impurities with large particle diameters in the fluorine-containing wastewater, the medium filter screen is used for preliminarily filtering the impurities with small diameters in the fluorine-containing wastewater, and a drag hook is fixedly installed on the upper part of each of the coarse filter screen and the medium filter screen.

[0011] As a further scheme of the present application: the heating device comprises a temperature adjusting valve fixedly installed on the upper part of the sedimentation pool, and a stainless steel heating pipe arranged in the sedimentation pool.

[0012] As a further scheme of the present application: a PH detection box is arranged on the sedimentation pool, a PH display meter is installed on the upper part of the PH detection box, and an acid-base regulator is arranged on the central axis of the sedimentation pool.

[0013] As a further scheme of the present application: a water quality detector is arranged on the preliminary filtering pool.

[0014] As a further scheme of the present application: a small-sized impeller agitator is arranged at the bottom of the sedimentation pool, the small-sized impeller agitator is used for crushing the precipitated calcium fluoride, a grid is arranged on the upper part of the second blowdown, and a sludge pump is connected to the outside of the second blowdown.

[0015] The present application has the following beneficial effects:

[0016] (1) The present application can effectively improve the filtering efficiency of the fluorine-containing wastewater through the arrangement of the filter screens with different hole diameters in the preliminary filtering pool, and the filter screens can be cleaned and replaced regularly through the movement of the sliding blocks driven by the servo motor.

[0017] (2) The stirring rod, the liquid storage pool, the stirring paddle and the water outlet arranged in the reaction pool are driven to rotate by the servo motor, the defluorination agent is pumped out from the fifth water outlet by the pressure pump, the mixing of the defluorination agent and the fluorine-containing wastewater is accelerated, the chemical reaction rate is accelerated, and the purification efficiency of the fluorine-containing wastewater is improved.

[0018] (3) The heating device is arranged in the sedimentation pool, the suitable precipitation temperature of the calcium fluoride solution in the sedimentation pool is controlled through the temperature adjusting valve, and the precipitation speed of the calcium fluoride can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in combination with the drawings.

[0020] Figure 1 is a schematic view of the overall structure of the purification pool for treating the fluorine-containing wastewater.

[0021] Figure 2 is the internal structure section view of the reaction tank of the utility model;

[0022] Figure 3 is the internal structure schematic view of the stirring rod of the utility model;

[0023] Figure 4 is the internal structure section view of the sedimentation tank of the utility model;

[0024] Figure 5 is the internal structure section view of the sliding device of the utility model;

[0025] Figure 6 is the internal structure schematic view of the depth filter tank of the utility model.

[0026] In the drawing: 1, fluorine-containing wastewater purification tank; 2, preliminary filter tank; 3, reaction tank; 4, sedimentation tank; 5, depth filter tank; 6, water inlet valve; 7, filter device; 8, first water outlet; 9, pressure pump; 10, drain pipe; 11, first blow-off port; 12, first water inlet; 13, defluorination agent adding device; 14, control valve; 15, stirring device; 16, second water outlet; 17, second water inlet; 18, heating device; 19, arc-shaped groove; 20, third water outlet; 21, second blow-off port; 22, T-shaped water valve; 23, third water inlet; 24, active alumina filter layer; 25, fourth water outlet; 26, fluorine content detection device; 27, stirring frame; 28, first servo motor; 29, driving gear; 30, transmission gear; 31, stirring rod; 32, liquid storage tank; 33, stirring paddle; 34, fifth water outlet; 35, second servo motor; 36, lead screw; 37, sliding block; 38, coarse filter screen; 39, medium filter screen; 40, drag hook; 41, temperature regulating valve; 42, stainless steel heating pipe; 43, PH detection box; 44, PH display meter; 45, acid-base regulator; 46, water quality detector; 47, small-sized impeller stirrer; 48, grid; 49, sludge pump. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] Please refer to Figures 1-6The utility model discloses a kind of purification ponds for wastewater defluorination, including fluorine-containing wastewater purification pond 1, the fluorine-containing wastewater purification pond 1 is divided into preliminary filter pool 2, reaction pool 3, sedimentation tank 4 and depth filter pool 5 by partition, the upper portion of preliminary filter pool 2 is fixedly provided with water inlet valve 6, the water inlet valve 6 is connected fluorine-containing wastewater input pipe, the inside of preliminary filter pool 2 is installed with filter device 7, the filter device 7 is used to carry out preliminary filtration to the suspended particulate impurities in fluorine-containing wastewater, improve filtration efficiency, the lower end of preliminary filter pool 2 is provided with first water outlet 8, one end of the first water outlet 8 is connected with pressure pump 9, one end of the pressure pump 9 is connected with drain pipe 10, the other end of the drain pipe 10 is connected to the upper end of reaction pool 3, the bottom of preliminary filter pool 2 is provided with first blow-off port 11, the upper end of reaction pool 3 is provided with first water inlet 12, the central axis on the upper end of reaction pool 3 is provided with defluorination reagent adder 13, control valve 14 is fixedly provided on the defluorination reagent adder 13, the amount of defluorination reagent can be effectively controlled by the arrangement of control valve 14, to avoid defluorination reagent overdose, so that purification cost increases, the inside of reaction pool 3 is provided with stirring device 15, the stirring device 15 is used for the rapid stirring mixing of fluorine-containing wastewater and defluorination reagent, to accelerate chemical reaction rate, the bottom of reaction pool 3 is provided with second water outlet 16, the second water outlet 16 is connected to the upper end of sedimentation tank 4 through drain pipe 10, the upper end of sedimentation tank 4 is provided with second water inlet 17, the inside of sedimentation tank 4 is fixedly provided with heating device 18, the heating device 18 is used for heating calcium fluoride solution after stirring mixing, the bottom inside the sedimentation tank 4 is provided with arc groove 19, so that precipitated calcium fluoride is gathered in second blow-off port 21 to facilitate subsequent cleaning, the outside of sedimentation tank 4 is provided with third water outlet 20, the lower portion of third water outlet 20 is provided with second blow-off port 21.

[0029] The depth filter pool 5 side wall is provided with T-shaped water valve 22, the upper end of the depth filter pool 5 is provided with third water inlet 23, the inside of the depth filter pool 5 is provided with active alumina filter layer 24, the active alumina filter layer 24 is used for further filtering fluorine-containing wastewater, the side of the depth filter pool 5 is provided with fourth water outlet 25, one end of the T-shaped water valve 22 is connected third water inlet 23, the other end is connected fourth water outlet 25, fluorine content detection device 26 is arranged between the T-shaped water valve 22 and third water inlet 23.

[0030] The stirring device 15 includes a stirring frame 27 fixedly installed on the reaction tank 3, a first servo motor 28 fixedly installed on the stirring frame 27, a driving gear 29 installed on the output shaft of the first servo motor 28, a transmission gear 30 provided on the side wall of the driving gear 29 and engaged with the driving gear 29, a stirring rod 31 fixedly sleeved on the transmission gear 30, a liquid storage tank 32 rotatably connected to the upper portion of the stirring rod 31, the defluorination agent adding device 13 connected to the liquid storage tank 32, stirring paddles 33 fixedly provided on the stirring rod 31, and a plurality of fifth water outlets 34 formed in the stirring paddles 33. The stirring paddles 33 are driven to rotate by the first servo motor 28. The defluorination agent is pumped into the interior of the stirring rod 31 by the pressure pump 9 and flows out of the fifth water outlets 34, so as to accelerate the mixing of the defluorination agent and the fluorine-containing wastewater and the purification efficiency.

[0031] The filtering device 7 includes second servo motors 35 fixedly installed on both sides of the upper portion of the preliminary filtering tank 2, lead screws 36 fixedly installed on the output shafts of the second servo motors 35, two sliding blocks 37 sleeved on the lead screws 36, coarse filter screens 38 and medium filter screens 39 respectively installed on the two sliding blocks 37, the coarse filter screens 38 used for preliminarily filtering large-diameter impurities in the fluorine-containing wastewater, the medium filter screens 39 used for preliminarily filtering small-diameter impurities in the fluorine-containing wastewater, and the coarse filter screens 38 and the medium filter screens 39 provided with pull hooks 40 fixedly installed on the upper portions thereof. The filtering efficiency is accelerated by the provision of filter screens with different diameters, and the filter screens are prevented from being blocked.

[0032] The heating device 18 includes ZZWP self-powered temperature regulating valves 41 fixedly installed on the upper portion of the precipitation tank 4, and stainless steel heating pipes 42 provided in the interior of the precipitation tank 4. The temperature of the stainless steel heating pipes 42 is set to a range suitable for calcium fluoride precipitation by the ZZWP self-powered temperature regulating valves 41, so as to accelerate the precipitation speed of calcium fluoride and improve the purification efficiency.

[0033] The precipitation tank 4 is fixedly provided with a PH detection box 43, the upper portion of the PH detection box 43 is fixedly installed with a PH display meter 44, and an acid-base regulator 45 is fixedly provided on the central axis of the precipitation tank 4. The PH value of the solution is detected by the PH display meter 44, and the PH value of the solution is adjusted by adding acid or alkali by the acid-base regulator 45, so as to adjust the PH value to a range suitable for calcium fluoride precipitation.

[0034] The preliminary filtering tank 2 is provided with a GLP-S11 multi-parameter water quality detector 46, which is used for preliminarily detecting the diameter of the suspended matter in the fluorine-containing wastewater, so as to select a suitable filter screen diameter and accelerate the preliminary filtering efficiency.

[0035] The bottom of the sedimentation tank 4 is provided with a small impeller agitator 47 for crushing the precipitated calcium fluoride, and stirring before the pump starts to work, so that the calcium fluoride is uniformly suspended, facilitating pumping.

[0036] The working principle of the utility model is: the operator connects the fluorine-containing wastewater to be purified from the water inlet valve 6, and preliminarily detects the diameter of the suspended matter in the fluorine-containing wastewater through the GLP-S11 multi-parameter water quality detector 46, so as to facilitate the replacement of the appropriate filter screen diameter and improve the filtering efficiency. The fluorine-containing wastewater is filtered through the coarse filter screen 38 to remove the impurities with large particles, and then is filtered through the middle filter screen 39 to remove the impurities with small particles. The two sliding blocks 37 are moved by the second servo motor 35, so as to drive the filter screen to move up and down, and the filter screen can be regularly cleaned and replaced. The filtered solution is pumped from the first water outlet 8 to the upper end of the reaction tank 3 through the pressure pump 9, flows into the reaction tank 3 from the first water inlet 12, and the defluorination additive is injected into the liquid storage tank 32 through the defluorination agent adding device 13, and then flows into the stirring rod 31. At this time, the first servo motor 28 is started, and the stirring rod 31 is driven to rotate by the first servo motor 28, so that the defluorination additive flows out of the fifth water outlet 34 and is fully mixed with the fluorine-containing wastewater to generate a chemical reaction. After sufficient stirring, the solution is pumped into the sedimentation tank 4 through the second water outlet 16 and the pressure pump 9. The PH value of the solution is detected by the PH display meter 44 on the PH detection box 43, the PH value of the solution is adjusted to the optimal PH range of calcium fluoride precipitation by the acid-base regulator 45, and the precipitation of calcium fluoride is accelerated. At this time, the temperature interval of the stainless steel heating pipe 42 is adjusted to a certain interval by the ZZWP type self-operated temperature regulating valve 41, so as to accelerate the precipitation of calcium fluoride. The slowly precipitated calcium fluoride slowly precipitates at the bottom of the sedimentation tank 4 through the arc-shaped groove 19, and is uniformly suspended by the small impeller agitator 47 before the sludge pump 49 is started, so as to facilitate pumping. The grid 48 is arranged to prevent the second sewage outlet 21 from being blocked.

[0037] The filtered clear liquid is detected for the fluorine content in the clear liquid by the fluorine content detection device 26 on the depth filtration tank 5. If the fluorine content meets the standard, the treated clear liquid can be discharged from the fourth water outlet 25 through the T-shaped water valve 22. If the fluorine content does not meet the standard, the clear liquid can be further filtered by entering the depth filtration tank 5 through the third water inlet 23. The depth filtration tank 5 is provided with an active alumina filter layer 24 for further filtering the clear liquid, and the active alumina filter layer 24 can be regenerated by using sodium hydroxide solution.

[0038] The above has carried out the detailed description to one embodiment of the utility model, but the content described is only the preferred embodiment of the utility model, cannot be considered for limiting the implementation scope of the utility model. All equal changes and improvements etc. that are made in the utility model application scope should still belong to the patent coverage scope of the utility model.

Claims

1. A purification tank for defluoridation of wastewater, characterized by, The utility model provides a fluorine-containing waste water purification tank (1) is divided into preliminary filtration pool (2), reaction pool (3), sedimentation tank (4) and depth filtration pool (5) by partition in the middle, the upper portion of preliminary filtration pool (2) is provided with water inlet valve (6), the inside installation of preliminary filtration pool (2) has filter device (7), and the filter device (7) is used to carry out preliminary filtration to the suspended particulate impurities in fluorine-containing waste water, and the lower end of preliminary filtration pool (2) is provided with first water outlet (8), one end of first water outlet (8) is connected with pressure pump (9), one end of pressure pump (9) is connected with drain pipe (10), the other end of drain pipe (10) is connected to the upper end of reaction pool (3), the bottom of preliminary filtration pool (2) is provided with first blow-off (11), the upper end of reaction pool (3) is provided with first water inlet (12), and the middle axis of reaction pool (3) upper end is provided with defluorination reagent feeder (13), and the control valve (14) is fixedly arranged on the defluorination reagent feeder (13), and the inside of reaction pool (3) is provided with stirring device (15), and the stirring device (15) is used for the rapid stirring mixing of fluorine-containing waste water and defluorination reagent, and the bottom of reaction pool (3) is provided with second water outlet (16), and second water outlet (16) is connected to the upper end of sedimentation tank (4) through drain pipe (10), the upper end of sedimentation tank (4) is provided with second water inlet (17), and the inside of sedimentation tank (4) is provided with heating device (18), and the heating device (18) is used for heating the calcium fluoride solution after stirring mixing, and the bottom of the inside of sedimentation tank (4) is provided with arc groove (19), and the outside of sedimentation tank (4) is provided with third water outlet (20), and the lower part of third water outlet (20) is provided with second blow-off (21).

2. The purification tank for removing fluorine from wastewater according to claim 1, characterized in that, The depth filtration pool (5) is provided with a T-shaped water valve (22) on the side wall, and the upper end of the depth filtration pool (5) is provided with a third water inlet (23). The depth filtration pool (5) is provided with an activated alumina filter layer (24) inside. The side edge of the depth filtration pool (5) is provided with a fourth water outlet (25). One end of the T-shaped water valve (22) is connected to the third water inlet (23), and the other end is connected to the fourth water outlet (25). The T-shaped water valve (22) is provided with a fluorine content detection device (26) between the third water inlet (23).

3. The purification tank for removing fluorine from wastewater according to claim 1, characterized in that, The stirring device (15) includes a stirring frame (27) fixedly installed on the reaction tank (3), a first servo motor (28) fixedly installed on the stirring frame (27), a driving gear (29) installed on the output shaft of the first servo motor (28), a transmission gear (30) provided on the side wall of the driving gear (29) and engaged with the driving gear (29), a stirring rod (31) fixedly sleeved on the transmission gear (30), a liquid storage tank (32) rotatably connected to the upper portion of the stirring rod (31), a defluorination agent adding device (13) connected to the liquid storage tank (32), and stirring paddles (33) fixedly provided on the stirring rod (31) and provided with a plurality of fifth water outlets (34).

4. The purification tank for removing fluorine from wastewater according to claim 1, characterized in that, The filtering device (7) includes second servo motors (35) fixedly installed on the upper portions of both sides of the preliminary filtering tank (2), screw rods (36) fixedly installed on the output shafts of the second servo motors (35), two sliding blocks (37) sleeved on the screw rods (36), coarse filter screens (38) and medium filter screens (39) respectively installed on the two sliding blocks (37), the coarse filter screens (38) used for preliminarily filtering large-diameter impurities in the fluorine-containing wastewater, the medium filter screens (39) used for preliminarily filtering small-diameter impurities in the fluorine-containing wastewater, and draw hooks (40) fixedly installed on the upper portions of the coarse filter screens (38) and the medium filter screens (39).

5. The purification tank for removing fluorine from wastewater according to claim 1, characterized in that, The heating device (18) includes temperature adjusting valves (41) fixedly installed on the upper portions of the precipitation tanks (4) and stainless steel heating pipes (42) arranged in the precipitation tanks (4).

6. The purification tank for removing fluorine from wastewater according to claim 1, characterized in that, The precipitation tanks (4) are provided with PH detection boxes (43), the upper portions of the PH detection boxes (43) are provided with PH display meters (44), and acid-base regulators (45) are arranged on the central axes of the precipitation tanks (4).

7. The purification tank for removing fluorine from wastewater according to claim 1, characterized in that, The preliminary filtering tanks (2) are provided with water quality detectors (46).

8. The purification tank for removing fluorine from wastewater according to claim 1, characterized in that, The bottom portions of the precipitation tanks (4) are provided with small-sized impeller stirrers (47) for crushing the precipitated calcium fluoride, the upper portions of the second sewage outlets (21) are provided with grids (48), and the sewage outlets (21) are connected with sludge pumps (49) outside the sewage outlets (21).

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