Treatment system for waste liquid containing iodide ions

Abstract

The utility model relates to a treatment system for waste liquid containing iodide ions, which comprises a pump, an extraction unit, a first oil-water separation unit, a reverse extraction unit, a second oil-water separation unit, an organic phase storage tank, an extraction agent storage tank and a diluent storage tank, an oil phase outlet of the first oil-water separation unit is communicated with the reverse extraction unit, the reverse extraction unit is communicated with the second oil-water separation unit, the diluent storage tank and the extraction agent storage tank are respectively communicated with the organic phase storage tank, and a first flowmeter and a first valve are arranged between the extraction agent storage tank and the organic phase storage tank; a second flowmeter and a second valve are arranged between the diluent storage tank and the organic phase storage tank; and a third valve is arranged between the organic phase storage tank and the extraction unit. The treatment system disclosed by the utility model has the advantages of good extraction and separation effects, simplicity, convenience, low treatment cost and the like, and has low requirements on medicaments and energy consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to a treatment system for waste liquid containing iodine ions belongs to waste liquid treatment equipment field. BACKGROUND

[0002] In the manufacturing process of the polarizing plate, the arsenic removal process of waste acid and the pharmaceutical industry, waste liquid containing iodine ions is often produced. For example, Chinese invention patent CN106242008B discloses a method for removing arsenic in waste acid system, which adds excess iodide and copper powder in waste acid, and after the reaction is completed, solid-liquid separation is carried out to obtain arsenic precipitate and post-arsenic removal liquid. Because of the excess iodine ions in the waste acid solution during arsenic removal, the obtained post-arsenic removal filtrate often contains iodine ions. The iodine ions in the waste liquid containing iodine ions may pollute the food chain through water bodies and soil, causing long-term adverse effects on the ecological system, and need to be harmlessly treated.

[0003] Currently, the treatment methods for waste liquid containing iodine ions include chemical precipitation method, activated carbon adsorption method, ion exchange method, membrane separation method, photocatalytic oxidation method, etc. The above methods need to consume specific chemical reagents (such as ferric chloride or iron oxide), or need to regularly replace or regenerate activated carbon, ion resin, or need higher pressure and energy consumption, so that the treatment cost is high. UTILITY MODEL CONTENT

[0004] The utility model aims at the shortage of prior art, and provides a treatment system for waste liquid containing iodine ions with low cost.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] The treatment system for waste liquid containing iodine ions comprises a pump, an extraction unit, a first oil-water separation unit, a stripping unit, a second oil-water separation unit, an organic phase storage tank, an extractant storage tank and a diluent storage tank. The pump, the extraction unit and the first oil-water separation unit are sequentially connected. The oil phase outlet of the first oil-water separation unit is connected with the stripping unit. The stripping unit is connected with the second oil-water separation unit. The diluent storage tank and the extractant storage tank are respectively connected with the organic phase storage tank. The first flow meter and the first valve are arranged between the extractant storage tank and the organic phase storage tank. The second flow meter and the second valve are arranged between the diluent storage tank and the organic phase storage tank. The third valve is arranged between the organic phase storage tank and the extraction unit.

[0007] Thus, the waste liquid containing iodine ions to be treated can be input into the extraction unit by the pump; by the first flow meter and the first valve, the second flow meter and the second valve, a specific proportion of the extractant (such as N235) and the diluent (such as kerosene) can be input into the organic phase storage tank to form the extraction organic phase; by controlling the opening and closing of the third valve, the extraction organic phase can be input into the extraction unit, the waste liquid and the extraction organic phase are contacted in the extraction unit, after extraction, the obtained oil-water mixture further enters the first oil-water separation unit, after oil-water separation, the obtained water phase is a low-iodine ion aqueous solution, which can be discharged or further treated (for example, returned to the extraction unit for further treatment until the target treatment effect is achieved), the obtained oil phase enriched with iodine ions further enters the stripping unit and is contacted with the stripping agent (such as an aqueous solution of sodium hydroxide) in the stripping unit, after stripping, the obtained oil-water mixture further enters the second oil-water separation unit, after oil-water separation, the oil phase and the water phase rich in iodine ions are obtained.

[0008] Further, the organic phase storage tank is provided with a stirring mechanism to realize more sufficient mixing of the extractant and the diluent, and further ensure the extraction effect.

[0009] Further, the oil phase outlet of the second oil-water separation unit is communicated with the organic phase storage tank, so that the reuse of the extraction organic phase can be facilitated, and the treatment cost can be reduced.

[0010] Further, the stripping liquid storage tank is further provided with a fourth valve, so that the stripping operation can be facilitated.

[0011] Further, the water phase outlet of the second oil-water separation unit is communicated with a crystallization unit, and the liquid outlet of the crystallization unit is communicated with the stripping liquid storage tank, so that the iodide in the water phase can be separated and recovered, the water phase can be regenerated, the remaining water phase can be input into the stripping liquid storage tank for reuse, the utilization rate of the stripping agent can be improved, and the treatment cost can be further reduced.

[0012] Further, the second storage tank is further provided with a fourth valve, so that the stripping operation can be facilitated.

[0013] Optionally, the oil-water separation unit is a clarifying tank, and the organic phase and the water phase can be separated by standing.

[0014] Optionally, additional pumps can be further provided on the relevant pipelines as needed to meet the corresponding conveying requirements.

[0015] Optionally, the first oil-water separation unit comprises a first pool body, the bottom of the first pool body is provided with a first channel A and a second channel A in communication with the first pool body, the first channel A is provided with a super-hydrophilic filler layer, the top surface of the super-hydrophilic filler layer is flush with the inner bottom surface of the first pool body or extends into the first pool body, the second channel A is provided with a super-hydrophobic filler layer, the top surface of the super-hydrophobic filler layer is flush with the inner bottom surface of the first pool body or extends into the first pool body; the extraction unit is in communication with the first pool body, and the outlet end of the second channel A is in communication with the back-extraction unit. In this way, the organic phase and the aqueous phase mixture can be separated immediately without waiting for static stratification, which helps to improve the continuous processing degree of the processing system and further improves the processing efficiency.

[0016] Further, the first oil-water separation unit further comprises a first liquid level meter for monitoring the liquid level in the first pool body, the outlet end of the first channel A is provided with a seventh valve, and the outlet end of the second channel A is provided with an eighth valve. In this way, the liquid level height of the oil-water mixture in the first pool body can be monitored by the first liquid level meter, when the liquid level height is large, the lower layer is mainly water phase, at this time the seventh valve can be opened and the eighth valve can be closed, so that the water phase flows out more quickly through the first channel A; when the liquid level is lowered to a lower level, the eighth valve can be opened and the seventh valve can be closed, so that the organic phase (oil phase) can flow out more quickly through the second channel A, thereby improving the oil-water separation rate, and at the same time, the possibility of accidental, pollution and blockage of the super-hydrophilic filler layer and the super-hydrophobic filler layer can be reduced, and the service life can be improved.

[0017] Optionally, a valve is provided between the extraction unit and the first pool body.

[0018] Optionally, the second oil-water separation unit comprises a second pool body, the bottom of the second pool body is provided with a first channel B and a second channel B in communication with the second pool body, the first channel B is provided with a super-hydrophilic filler layer, the top surface of the super-hydrophilic filler layer is flush with the inner bottom surface of the second pool body or extends into the second pool body, the second channel B is provided with a super-hydrophobic filler layer, the top surface of the super-hydrophobic filler layer is flush with the inner bottom surface of the second pool body or extends into the second pool body; the back-extraction unit is in communication with the second pool body. In this way, the organic phase and the aqueous phase mixture can be separated immediately without waiting for static stratification, which helps to improve the continuous processing degree of the processing system and further improves the processing efficiency.

[0019] Optionally, the thickness of the super-hydrophilic filler layer is 40-80 cm; the thickness of the super-hydrophobic filler layer is 40-80 cm.

[0020] Further, the second oil-water separation unit further comprises a second liquid level meter for monitoring the liquid level in the second pool body, the outlet end of the first channel B is provided with a ninth valve, and the outlet end of the second channel B is provided with a tenth valve. Therefore, similarly, it is also helpful to improve the oil-water separation rate, while reducing the possibility of accidental, contaminated plugging of the super-hydrophilic filler layer and the super-hydrophobic filler layer, and improving the service life.

[0021] Optionally, a valve is arranged between the stripping unit and the second pool body.

[0022] More specifically, the super-hydrophobic filler is one of sand, ceramic, glass chips, diatomite, ore particles and the like modified with super-hydrophobicity.

[0023] More specifically, the super-hydrophobic filler can be a material with super-hydrophobicity mentioned in the prior art such as PCT / EP2015 / 065140, CN201610394839.7, CN201680057527.5, CN202111407671.6, CN202210608254.6 and the like.

[0024] Further, the super-hydrophilic filler is one of ceramic, glass chips, diatomite, ore, Fe3O4 particle loaded nanotubes (Fe3O4 / NTs) (for example, CN117258561A) and the like.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] (1) The treatment system of the utility model can simply control the proportion of extractant and diluent in the extracted organic phase, which helps to obtain excellent extraction separation effect.

[0027] (2) Through the related action of the first oil-water separation unit, the stripping unit, the second oil-water separation unit, the crystallization unit and the like, the extracted organic phase and part of the stripping liquid used in the utility model can be recycled, and only the component ratio needs to be adjusted appropriately to maintain good treatment effect, which helps to reduce the treatment cost.

[0028] (3) The treatment system of the utility model has the advantages of simplicity and low treatment cost, and the demand for medicaments and energy consumption is not high.

[0029] (4) The treatment system of the utility model is easier to realize continuous treatment of waste liquid, which helps to improve the treatment efficiency and reduce the treatment cost. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural diagram of a treatment system for waste liquid containing iodine ions of embodiment 1 of the utility model.

[0031] Figure 2 is a structural diagram of a treatment system for waste liquid containing iodine ions according to Embodiment 2 of the present application.

[0032] Figure 3 is a structural diagram of a treatment system for waste liquid containing iodine ions according to Embodiment 3 of the present application.

[0033] Figure 4 is Figure 3 is an enlarged view of the first oil-water separation unit in

[0034] Figure 5 is a structural diagram of a treatment system for waste liquid containing iodine ions according to Embodiment 4 of the present application. DETAILED DESCRIPTION

[0035] The present application will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. For the sake of description, if the terms "upper", "lower", "left", "right" appear in the following text, they only mean the same as the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.

[0036] Embodiment 1

[0037] Referring to Figure 1 , a treatment system for waste liquid containing iodine ions, comprising a pump 2, an extraction unit 3, a first oil-water separation unit 4, a stripping unit 5, a second oil-water separation unit 6, an organic phase storage tank 9, an extractant storage tank 10 and a diluent storage tank 11, the pump 2, the extraction unit 3 and the first oil-water separation unit 4 are sequentially connected, the oil phase outlet of the first oil-water separation unit 4 is connected with the stripping unit 5, the stripping unit 5 is connected with the second oil-water separation unit 6, the diluent storage tank 11 and the extractant storage tank 10 are respectively connected with the organic phase storage tank 9, a first flow meter 12 and a first valve 14 are arranged between the extractant storage tank 10 and the organic phase storage tank 9, a second flow meter 13 and a second valve 15 are arranged between the diluent storage tank 11 and the organic phase storage tank 9; a third valve 16 is arranged between the organic phase storage tank 9 and the extraction unit 3.

[0038] The organic phase storage tank 9 is equipped with a stirring mechanism. The oil phase outlet of the second oil-water separation unit 6 is connected to the organic phase storage tank 9. It also includes a back-extraction liquid storage tank 8 (using a 4 mol / L sodium hydroxide solution), which is connected to the back-extraction unit 5. A fourth valve 17 is provided between the back-extraction liquid storage tank 8 and the back-extraction unit 5. The top of the back-extraction liquid storage tank 8 is equipped with a water inlet 18 and a chemical dosing inlet 19 for adding sodium hydroxide, to facilitate control or adjustment of the chemical concentration in the back-extraction liquid storage tank. The aqueous phase outlet of the second oil-water separation unit 6 is connected to a crystallization unit 7 (evaporation crystallization unit), and the outlet of the crystallization unit 7 is connected to the back-extraction liquid storage tank 8. It also includes a second storage tank 1, which is connected to the extraction unit 3 via a pump 2. The extraction unit 3 is equipped with a stirring mechanism.

[0039] The above-mentioned treatment system is used to treat waste liquid containing iodide ions (I - The concentration was 35.1 g / L, Na + The concentration was 11.385 mg / L, H + N235 (at a concentration of 1.65 mol / L) was added to the extractant storage tank 10, and kerosene was added to the diluent storage tank 11. N235 and kerosene were then introduced into the organic phase storage tank 9 at a volume ratio of 4:6 through a first flow meter, a first valve, a second flow meter, and a second valve to form an organic extractant phase. Waste liquid and the organic extractant phase were then introduced into the extraction unit at a ratio of O / A of 1:1, and extraction was performed at 25°C for 10 minutes. The results showed that the extraction rate of iodide ions reached 99.91%, indicating that the extraction and separation effect of the treatment system of this invention is excellent.

[0040] Example 2

[0041] Repeat Example 1, except that: see Figure 2 The first oil-water separation unit 4 has an outlet pipe 20 connected to its water phase outlet, and a fifth valve 21 is provided on the outlet pipe 20. It also includes a return pipe 22, the inlet end of which is connected to the outlet pipe 20, and the outlet end of which is connected to the extraction unit 3. A sixth valve 23 is provided on the return pipe 22. The connection position between the return pipe 22 and the outlet pipe 20 is located upstream of the fifth valve 21.

[0042] Example 3

[0043] Repeat Example 1, except that: see Figure 3 and Figure 4, the first oil-water separation unit 4 comprises a first pool body, the bottom of the first pool body is provided with a first channel A24 and a second channel A25 in communication with the first pool body, the first channel A24 is provided with a super-hydrophilic filler layer, the top surface of the super-hydrophilic filler layer is flush with the inner bottom surface of the first pool body, the second channel A25 is provided with a super-hydrophobic filler layer, the top surface of the super-hydrophobic filler layer is flush with the inner bottom surface of the first pool body; the extraction unit 3 is in communication with the first pool body, the outlet end of the second channel A25 is in communication with the back-extraction unit 5.

[0044] The second oil-water separation unit 6 comprises a second pool body, the bottom of the second pool body is provided with a first channel B26 and a second channel B27 in communication with the second pool body, the first channel B26 is provided with a super-hydrophilic filler layer, the top surface of the super-hydrophilic filler layer is flush with the inner bottom surface of the second pool body, the second channel B27 is provided with a super-hydrophobic filler layer, the top surface of the super-hydrophobic filler layer is flush with the inner bottom surface of the second pool body; the back-extraction unit 5 is in communication with the second pool body, the outlet end of the first channel B is in communication with the crystallization unit 7, and the outlet end of the second channel B is in communication with the outlet end of the organic phase storage tank 9.

[0045] Example 4

[0046] Example 3 is repeated, and the only difference is that Figure 5 , the first oil-water separation unit further comprises a first liquid level gauge 32 for monitoring the liquid level in the first pool body, the outlet end of the first channel A24 is provided with a seventh valve 28, and the outlet end of the second channel A25 is provided with an eighth valve 29. The second oil-water separation unit further comprises a second liquid level gauge 33 for monitoring the liquid level in the second pool body, the outlet end of the first channel B26 is provided with a ninth valve 30, and the outlet end of the second channel B27 is provided with a tenth valve 31.

[0047] The above-mentioned embodiments should be understood as merely illustrating the present application, and should not be used to limit the scope of the present application, and after reading the present application, various equivalent modifications of the present application made by those skilled in the art fall within the scope defined by the appended claims.

Claims

1. A treatment system for waste liquid containing iodine ions, characterized by, The system comprises a pump (2), an extraction unit (3), a first oil-water separation unit (4), a stripping unit (5), a second oil-water separation unit (6), an organic phase storage tank (9), an extractant storage tank (10) and a diluent storage tank (11), the pump (2), the extraction unit (3) and the first oil-water separation unit (4) are sequentially connected, the oil phase outlet of the first oil-water separation unit (4) is connected with the stripping unit (5), the stripping unit (5) is connected with the second oil-water separation unit (6), the diluent storage tank (11) and the extractant storage tank (10) are respectively connected with the organic phase storage tank (9), a first flow meter (12) and a first valve (14) are arranged between the extractant storage tank (10) and the organic phase storage tank (9), a second flow meter (13) and a second valve (15) are arranged between the diluent storage tank (11) and the organic phase storage tank (9); a third valve (16) is arranged between the organic phase storage tank (9) and the extraction unit (3).

2. The processing system of claim 1, wherein, The organic phase storage tank (9) is provided with a stirring mechanism.

3. The processing system of claim 1, wherein, The oil phase outlet of the second oil-water separation unit (6) is connected with the organic phase storage tank (9).

4. The processing system of claim 1, wherein, The system further comprises a stripping liquid storage tank (8), the stripping liquid storage tank (8) is connected with the stripping unit (5), and a fourth valve (17) is arranged between the stripping liquid storage tank (8) and the stripping unit (5).

5. The processing system of claim 4, wherein, The water phase outlet of the second oil-water separation unit (6) is connected with a crystallization unit (7), and the liquid outlet of the crystallization unit (7) is connected with the stripping liquid storage tank (8).

6. The processing system according to any one of claims 1-5, characterized by, The system further comprises a second storage tank (1), and the second storage tank (1) is connected with the extraction unit (3) through the pump (2).

7. The processing system according to any one of claims 1-5, characterized by, The first oil-water separation unit (4) comprises a first pool body, the bottom of the first pool body is provided with a first channel A (24) and a second channel A (25) connected with the first pool body, the first channel A (24) is provided with a super-hydrophilic filler layer, the top surface of the super-hydrophilic filler layer is flush with the inner bottom surface of the first pool body or extends into the first pool body, the second channel A (25) is provided with a super-hydrophobic filler layer, the top surface of the super-hydrophobic filler layer is flush with the inner bottom surface of the first pool body or extends into the first pool body; the extraction unit (3) is connected with the first pool body, and the outlet end of the second channel A (25) is connected with the stripping unit (5).

8. The processing system of claim 7, wherein, The first oil-water separation unit (4) further comprises a first liquid level meter (32) for monitoring the liquid level in the first pool body, the outlet end of the first channel A (24) is provided with a seventh valve (28), and the outlet end of the second channel A (25) is provided with an eighth valve (29).

9. The processing system according to any one of claims 1-5, characterized by, The second oil-water separation unit (6) comprises a second pool body, the bottom of the second pool body is provided with a first channel B (26) and a second channel B (27) connected with the second pool body, the first channel B (26) is provided with a super-hydrophilic filler layer, the top surface of the super-hydrophilic filler layer is flush with the inner bottom surface of the second pool body or extends into the second pool body, the second channel B (27) is provided with a super-hydrophobic filler layer, the top surface of the super-hydrophobic filler layer is flush with the inner bottom surface of the second pool body or extends into the second pool body; the stripping unit (5) is connected with the second pool body.

10. The processing system of claim 9, wherein, The second oil-water separation unit (6) further comprises a second liquid level meter (33) for monitoring the liquid level in the second pool body, and the outlet end of the first channel B (26) is provided with a ninth valve (30), and the outlet end of the second channel B (27) is provided with a tenth valve (31).

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