A system for separating bromine and iodine in brine

Abstract

The utility model relates to the technical field of salt lake brine separation, specifically relates to a system for separating bromine and iodine in brine, the system comprises primary brine pool and iodine bromine separation device that communicate in proper order, and the iodine bromine separation device includes oxidation unit, cooling sedimentation tank, mother liquor treatment unit and bromine extraction device that communicate in proper order, and the oxidation unit communicates with primary brine pool, and the iodine bromine separation device further includes iodine element collection unit, and the iodine element collection unit communicates with cooling sedimentation tank, and the mother liquor treatment unit includes reflux material outlet, and the reflux material outlet communicates with oxidation unit. The utility model can effectively realize iodine bromine separation, and improve iodine bromine purity.

Description

Technical Field

[0001] This utility model relates to the field of salt lake brine separation technology, specifically to a system for separating bromine and iodine from brine. Background Technology

[0002] Salt lakes are mainly classified by chemical composition into chloride-type, sulfate-type, and carbonate-type salt lakes. Chloride-type salt lakes: The main salt in their water is sodium chloride (NaCl). The salt composition of these lakes is similar to seawater, but at a higher concentration. For example, the Dead Sea is primarily composed of sodium chloride. Sulfate-type salt lakes: The main salts in their water are sulfates such as magnesium sulfate (MgSO4) and sodium sulfate (Na2SO4). For example, the Great Salt Lake in Utah, USA, is primarily composed of magnesium sulfate. Carbonate-type salt lakes: The main salts in their water are carbonates such as sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3). These salt lakes typically form in alkaline environments, such as the Chaka Salt Lake in China.

[0003] The bromine content in salt lake brine is greater than 50 mg / L. Bromine concentrations >10 mg / L are low and have low mining value. This part of the bromine is usually wasted after potassium and lithium extraction.

[0004] Existing bromine extraction systems typically first oxidize monovalent bromine to elemental form using chlorine or sulfur dioxide, followed by purification. Both chlorine and sulfur dioxide are toxic gases, posing certain risks during the production process. Furthermore, transporting chlorine and sulfur dioxide requires specialized tank trucks, resulting in high raw material costs. Current bromine extraction technologies only target bromine extraction and do not involve iodine extraction.

[0005] Existing iodine extraction systems are designed for water containing chlorine and iodine, but systems for separating bromine and iodine are lacking.

[0006] Some salt lake brines have high bromine and iodine content and significant utilization value. However, the bromine and iodine contained in these brines are not being fully utilized. Given that bromine and iodine belong to the same group of elements, have similar properties, and are difficult to separate, while iodine is expensive (market price 500,000 yuan / ton) and widely used in sterilization, disinfection, photosensitive materials, artificial rainmaking, and chemical analysis, separating iodine separately has significant economic value. Therefore, there is an urgent need to develop a system for separating bromine and iodine from brine. Utility Model Content

[0007] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a system for separating bromine and iodine in brine, so as to solve the problems of difficult separation of bromine and iodine and low purity in the prior art.

[0008] To achieve the above and other related objectives, this utility model provides a system for separating bromine and iodine from brine. The system includes a raw brine tank and an iodine-bromine separation device connected in sequence. The iodine-bromine separation device includes an oxidation unit, a cooling sedimentation tank, a mother liquor treatment unit, and a bromine extraction device connected in sequence. The oxidation unit is connected to the raw brine tank. The iodine-bromine separation device also includes an iodine element collection unit, which is connected to the cooling sedimentation tank. The mother liquor treatment unit includes a reflux material outlet, which is connected to the oxidation unit.

[0009] In some embodiments of this utility model, the oxidation unit includes a second reaction tank and a third reaction tank that are connected to each other. The second reaction tank is connected to the original brine tank, and the third reaction tank is connected to the cooling sedimentation tank.

[0010] In some embodiments of this utility model, the mother liquor treatment unit includes a first distillation unit, and the cooling sedimentation tank, the first distillation unit, and the bromine extraction device are connected in sequence. The first distillation unit includes a reflux material outlet, and the reflux material outlet is connected to a third reaction tank.

[0011] In some embodiments of this utility model, the mother liquor treatment unit further includes a fourth reaction tank, and the cooling sedimentation tank, the fourth reaction tank, the first distillation unit, and the bromine extraction device are connected in sequence, and the reflux material outlet is connected to the third reaction tank.

[0012] In some embodiments of this utility model, the mother liquor treatment unit includes a fourth reaction tank, a second stripping tower, and a second absorption tower. The cooling sedimentation tank, the fourth reaction tank, the second stripping tower, and the bromine extraction device are connected in sequence. The second stripping tower is connected to the second absorption tower. The second absorption tower includes a reflux material outlet, which is connected to the second reaction tank.

[0013] In some embodiments of this utility model, the bromine extraction device includes a fifth reaction tank, a second distillation unit, a rectification unit, and a pure bromine collection unit, wherein the fifth reaction tank is connected to the mother liquor treatment unit.

[0014] In some embodiments of this utility model, a concentration device is provided between the raw brine tank and the iodine-bromine separation device. The concentration device includes a filter, a regulator, a first reaction tank, a first stripping tower, and a first absorption tower connected in sequence. The filter is connected to the raw brine tank, and the first absorption tower is connected to the oxidation unit.

[0015] In some embodiments of this invention, the regulator includes a first acid inlet.

[0016] In some embodiments of this utility model, the first reaction tank includes a first oxidant inlet.

[0017] In some embodiments of this utility model, the first stripping tower includes a first hot air inlet and a tail liquid outlet.

[0018] In some embodiments of this utility model, the first absorption tower includes a first reducing agent inlet.

[0019] In some embodiments of this invention, the second reaction tank includes a second acid inlet.

[0020] In some embodiments of this invention, the third reaction tank includes a second oxidant inlet.

[0021] In some embodiments of this invention, the fourth reaction tank includes a third oxidant inlet.

[0022] In some embodiments of this invention, the first distillation unit includes a second hot air inlet.

[0023] In some embodiments of this invention, the second stripping tower includes a third hot air inlet.

[0024] In some embodiments of this invention, the second absorption tower includes a second reducing agent inlet.

[0025] In some embodiments of this invention, the fifth reaction tank includes a fourth oxidant inlet.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] In the brine separation system provided by this invention, the raw brine undergoes a full reaction in the oxidation unit, then enters a cooling and precipitation tank for cooling and precipitation, resulting in the precipitation of elemental iodine. The precipitated elemental iodine is then washed and dried to obtain pure elemental iodine, which is sold as a product. Furthermore, the iodine-removed liquid after the mother liquor treatment unit passes through a bromine extraction device, which combines bromine extraction and purification functions. The purified bromine is then sold as a product.

[0028] More preferably, an oxidant is added to the iodine-removing solution after the mother liquor treatment unit in the fifth reaction tank to remove the remaining Br. - The bromine is oxidized to Br2, and the resulting bromine-containing water is distilled through a second distillation unit. The remaining bromine is distilled off and condensed to obtain bromine containing a small amount of impurities. The bromine containing a small amount of impurities is then subjected to a rectification unit to obtain bromine with a relatively pure taste. The purified bromine is sold as a product.

[0029] In the existing technology, the simple stripping of bromine and iodine is prone to the inclusion of some bromine and iodine. This invention connects the reflux material outlet with the oxidation unit to form a reflux process, which can effectively improve the purity of iodine and bromine.

[0030] More preferably, the oxidation unit includes a second or third reaction tank. Iodine and bromine are distilled through a first distillation unit. The distilled bromine and iodine enter the third reaction tank, where bromine replaces iodine ions with iodine, causing the iodine to precipitate. The iodine is retained in the water due to stirring. Alternatively, a stripping method is used to strip the iodine and bromine in a second stripping tower. The water after stripping is called the iodine-removing stripping solution. The air containing iodine and bromine that has been stripped is absorbed and reduced to ionic form in a second absorption tower to obtain a mixed solution. This mixed solution is returned to the second reaction tank for recycling.

[0031] More preferably, when the original brine is a low-concentration brine, a concentration device is provided between the original brine tank and the iodine-bromine separation device. After the original brine is concentrated by the concentration device, a high-concentration brine is obtained, such as a high-iodine solution (with high bromine and iodine concentrations, which can be used to separate bromine and iodine). After further reaction in the oxidation unit, it enters the cooling sedimentation tank for cooling and precipitation, where elemental iodine precipitates. The precipitated elemental iodine is washed and dried to obtain pure elemental iodine, which is sold as a product. Furthermore, the iodine-removed liquid after the mother liquor treatment unit passes through a bromine extraction device, which has both bromine extraction and purification functions. The purified pure bromine is sold as a product.

[0032] In summary, this invention can effectively achieve the separation of iodine and bromine, and improve the purity of iodine and bromine. Attached Figure Description

[0033] Figure 1 The diagram shown is a schematic representation of a first embodiment of a system for separating bromine and iodine from brine.

[0034] Figure 2 The diagram shown is a schematic representation of a second embodiment of a system for separating bromine and iodine from brine.

[0035] Figure 3 The diagram shown is a schematic representation of a third embodiment of a system for separating bromine and iodine from brine.

[0036] Component designation explanation:

[0037] 1. Original brine tank

[0038] 2 Concentration Unit

[0039] 21 Filters

[0040] 22 Regulator

[0041] 221 First acid solution import

[0042] 23 First Reaction Tank

[0043] 231 First Oxidizing Agent Import

[0044] 24 First Blowout Tower

[0045] 241 First Hot Air Inlet

[0046] 242 Tailings outlet

[0047] 25 First Absorption Tower

[0048] 251 First reducing agent import

[0049] 3. Iodine-bromine separation unit

[0050] 31 Oxidation Unit

[0051] 311 Second Reaction Tank

[0052] 3111 Second acid inlet

[0053] 312 Third Reaction Tank

[0054] 3121 Second Oxidizing Agent Import

[0055] 32 Cooling sedimentation tank

[0056] 33 Mother liquor treatment unit

[0057] 331 Fourth Reaction Tank

[0058] 3111 Import of the third oxidant

[0059] 3112 Second Hot Air Inlet

[0060] 332 First Distillation Unit

[0061] 333 Second Blowout Tower

[0062] 3331 Third Hot Air Inlet

[0063] 334 Second Absorption Tower

[0064] 3341 Second reducing agent import

[0065] 335 Reflux material outlet

[0066] 34. Bromine Extraction Unit

[0067] 341 Fifth Reaction Tank

[0068] 3411 Imported Fourth Oxidizing Agent

[0069] 342 Second Distillation Unit

[0070] 343 Distillation Unit

[0071] 344 Pure Bromine Collection Unit

[0072] 35 Iodine Collection Unit Detailed Implementation

[0073] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0074] The terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0075] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0076] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0077] like Figures 1-3This invention provides a system for separating bromine and iodine from brine. The system includes a raw brine tank 1 and an iodine-bromine separation device 3 connected in sequence. The iodine-bromine separation device 3 includes an oxidation unit 31, a cooling sedimentation tank 32, a mother liquor treatment unit 33, and a bromine extraction device 34 connected in sequence. The oxidation unit 31 is connected to the raw brine tank 1. The iodine-bromine separation device 3 also includes an iodine collection unit 35, which is connected to the cooling sedimentation tank 32. The mother liquor treatment unit 33 includes a reflux material outlet 335, which is connected to the oxidation unit 31. In the system provided by this invention, the raw brine (e.g., high-concentration brine) in the raw brine tank 1 is fully reacted by the oxidation unit 31 and then enters the cooling sedimentation tank 32 for cooling and precipitation, where iodine is precipitated. The precipitated iodine is then washed and dried to obtain pure iodine, which is sold as a product. Furthermore, the iodine-removed liquid after passing through the mother liquor treatment unit 33 is passed through the bromine extraction device 34. The bromine extraction device 34 has both bromine extraction and purification functions, and the purified pure bromine is sold as a product. Regarding the raw brine, the salt lake brine contains a certain concentration of bromine and iodine. It can be the tailings brine after lithium, potassium, and boron extraction, or it can be the brine extracted from the salt lake; here, it is collectively referred to as raw brine.

[0078] In the brine separation system provided by this embodiment of the invention, such as... Figures 1-3 The oxidation unit 31 includes a second reaction tank 311 and a third reaction tank 312 that are connected to each other. The second reaction tank 311 is connected to the original brine tank 1, and the third reaction tank 312 is connected to the cooling sedimentation tank 32.

[0079] Further, the second reaction tank 311 includes a second acid inlet 3111, and the third reaction tank 312 includes a second oxidant inlet 3121. The raw brine enters the first reaction tank 23, and acid is added to the second reaction tank 311 through the second acid inlet 3111. After the acid reaction, it enters the third reaction tank 312, where a small amount of oxidant (e.g., NaClO) is added through the second oxidant inlet 3121 to react, controlling the redox potential between 300-500 mV, thus removing most of the I₂. - Oxidized to elemental iodine, while Br - It remains dissolved in water in an ionic state.

[0080] After the reaction in the third reaction tank 312 is complete, the iodine is cooled and precipitated in the cooling sedimentation tank 32. Iodine has very low solubility in water (0.2 g / L at 20°C), so it can precipitate out. The precipitated iodine is further washed and dried to obtain pure iodine, which is then collected by the iodine collection unit 35 and sold as a product.

[0081] In the brine separation system provided by this embodiment of the invention, such as... Figures 1-3 The mother liquor treatment unit 33 includes various implementations. Specifically:

[0082] In the first embodiment, such as Figure 1 The mother liquor treatment unit 33 includes a first distillation unit 332. The cooling sedimentation tank 32, the first distillation unit 332, and the bromine extraction device 34 are connected in sequence. The first distillation unit 332 includes a reflux material outlet 335, which is connected to the third reaction tank 312. The first distillation unit 332 is, for example, a distillation tower, which uses distillation. The water obtained from the cooling sedimentation tank 32 after iodine precipitation is distilled with iodine and bromine in the first distillation unit 332. The distilled bromine and iodine elements flow out from the reflux material outlet 335 and are further refluxed back to the third reaction tank 312. The bromine replaces iodine ions with iodine elements, and the iodine elements form a precipitate. The iodine elements are retained in the water due to the stirring action.

[0083] In the second embodiment, such as Figure 2 The mother liquor treatment unit 33 includes a first distillation unit 332 and a fourth reaction tank 331. The cooling sedimentation tank 32, the fourth reaction tank 331, the first distillation unit 332, and the bromine extraction device 34 are sequentially connected. The reflux material outlet 335 is connected to the third reaction tank 312. Further, the fourth reaction tank 331 includes a third oxidant inlet 3311, and the first distillation unit 332 includes a second hot air inlet 3321. The water after iodine precipitation in the cooling sedimentation tank 32 enters the fourth reaction tank 331. A small amount of NaClO is added to the fourth reaction tank 331 through the third oxidant inlet 3311 to react, making the ORP > 500mV, thus removing all the iodine. - and part of Br - The water obtained from the above process is called the iodine removal reaction solution. The iodine removal reaction solution is distilled in the first distillation unit 332 to distill iodine and bromine. The distilled bromine and iodine flow out from the reflux material outlet 335 and are further refluxed to the third reaction tank 312. The bromine replaces the iodine ions with iodine, and the iodine forms a precipitate. The iodine is retained in the water due to the stirring action.

[0084] In the third embodiment, such as Figure 3The mother liquor treatment unit 33 includes a fourth reaction tank 331, a second stripping tower 333, and a second absorption tower 334. The cooling sedimentation tank 32, the fourth reaction tank 331, the second stripping tower 333, and the bromine extraction device 34 are sequentially connected. The second stripping tower 333 is connected to the second absorption tower 334, which includes a reflux material outlet 335 connected to the second reaction tank 311. Further, the second stripping tower 333 includes a third hot air inlet 3331. The second absorption tower 334 includes a second reducing agent inlet 3341. After iodine precipitation in the cooling sedimentation tank 32, the water enters the fourth reaction tank 331. A small amount of NaClO is added to the fourth reaction tank 331 through the third oxidant inlet 3311 to react, making the ORP > 500mV, thus removing all the iodine. - and part of Br - The water obtained from the above process, after oxidation to elemental form, is called the iodine removal reaction solution. Iodine and bromine are then stripped away using a stripping method. The water after stripping in the second stripping tower 333 is called the iodine removal stripping solution. The air containing iodine and bromine that has been stripped away is absorbed and reduced to ionic form in the second absorption tower 334, resulting in a mixed solution. This mixed solution flows out from the reflux material outlet 335 and returns to the second reaction tank 311 for recycling.

[0085] In the brine separation system provided by this embodiment of the invention, such as... Figures 1-3 The bromine extraction device 34 includes a fifth reaction tank 341, a second distillation unit 342, a rectification unit 343, and a pure bromine collection unit 344. The fifth reaction tank 341 is connected to the mother liquor treatment unit 33.

[0086] Furthermore, the fifth reaction tank 341 includes a fourth oxidant inlet 3411.

[0087] Furthermore, following the first and second embodiments described above, the fifth reaction tank 341 is connected to the first distillation unit 332. The iodine-removing solution after distillation in the first distillation unit 332 enters the fifth reaction tank 341. An oxidant is added to the fifth reaction tank 341 through the fourth oxidant inlet 3411 to remove the remaining Br. - It is oxidized to Br2, and the oxidizing agent can be one or a combination of NaClO, H2O2, and O3.

[0088] Further, following the aforementioned third embodiment, the fifth reaction tank 341 is connected to the second stripping tower 333. The iodine-removing stripping liquid after stripping by the second stripping tower 333 enters the fifth reaction tank 341. An oxidant is added to the fifth reaction tank 341 through the fourth oxidant inlet 3411 to remove the remaining Br. - It is oxidized to Br2, and the oxidizing agent can be one or more combinations of NaClO, H2O2, and O3.

[0089] Further, the bromine-containing water obtained from the fifth reaction tank 341 is distilled in the second distillation unit 342 to remove the remaining bromine. Excess ozone decomposes into oxygen at high temperature. The bromine, containing a small amount of impurities, is then condensed to obtain bromine. The second distillation unit 342 is, for example, a distillation column.

[0090] Furthermore, bromine containing trace impurities is further distilled in distillation unit 343 to obtain bromine of higher purity, which is then collected in pure bromine collection unit 344. The higher purity bromine is sold as a product. Distillation unit 343 is, for example, a distillation column.

[0091] In the brine separation system provided by this embodiment of the invention, such as... Figures 1-3 A concentration device 2 is provided between the raw brine tank 1 and the iodine-bromine separation device 3. When the raw brine is a low-concentration brine, it is concentrated in the concentration device 2 to obtain a high-concentration brine, such as a high-iodine solution (with high bromine and iodine concentrations, which can be used to separate bromine and iodine). After further reaction in the oxidation unit 31, it enters the cooling sedimentation tank 32 for cooling and precipitation, where elemental iodine precipitates. The precipitated elemental iodine is washed and dried to obtain pure elemental iodine, which is sold as a product. Furthermore, the iodine-removed solution after passing through the mother liquor treatment unit 33 passes through the bromine extraction device 34, which has both bromine extraction and purification functions. The purified pure bromine is sold as a product.

[0092] The concentration device 2 includes a filter 21, a regulator 22, a first reaction tank 23, a first stripping tower 24, and a first absorption tower 25 connected in sequence. The filter 21 is connected to the original brine tank 1, and the first absorption tower 25 is connected to the oxidation unit 31.

[0093] Furthermore, the filter 21 can be, for example, one or a combination of a filter press, a precision filter, a self-cleaning filter, and a bag filter, to obtain brine with fewer particulate matter after filtering the raw brine.

[0094] Furthermore, the regulator 22 includes a first acid inlet 221. The brine with fewer particulate matter obtained after filtration is acidified through the first acid inlet 221 to adjust its pH value to less than 3, and the amount of acid added is higher than the total molar amount of bromine and iodine.

[0095] Furthermore, the first reaction tank 23 includes a first oxidant inlet 231, through which the oxidant is added to the first reaction tank 23 to oxidize bromine and iodine into elemental bromine and iodine. The oxidant can be chlorine, sodium hypochlorite, ozone, or hydrogen peroxide, preferably sodium hypochlorite.

[0096] Furthermore, the first stripping tower 24 includes a first hot air inlet 241 and a tail liquid outlet 242. Air stripping is used to strip bromine and iodine from the brine. Hot air enters the first stripping tower 24 through the first hot air inlet 241. During normal operation of the blower, heat is generated, and the hot air (30-90℃) blown out by the blower can strip the bromine and iodine. The tail liquid is discharged from the tail liquid outlet 242.

[0097] Furthermore, the first absorption tower 25 includes a first reducing agent inlet 251. The stripped air is absorbed by the absorption tower to remove bromine and iodine through a reducing agent. The reducing agent is added to the first absorption tower 25 via the first reducing agent inlet 251. The reducing agent can be NaHSO3, Na2S2O3, or other reducing solutions, preferably NaHSO3, which can both participate in the reaction and increase the hydrogen ion concentration, reducing the amount of acid added subsequently. This reduces the bromine and iodine to their ionic state, completing the initial concentration of bromine and iodine. The water concentrated in the first absorption tower 25 is called a high-iodine solution, with a high concentration of bromine and iodine, which can be used to separate bromine and iodine. Acid is added to adjust the pH value below 3, providing sufficient acid for subsequent bromine and iodine oxidation.

[0098] In summary, the brine separation system of this invention involves the following steps: First, acid and an oxidant are added to the first reaction tank 23 to oxidize bromine and iodine into their constituent elements. Then, bromine and iodine are enriched through stripping in the first stripping tower 24 and reduction absorption in the first absorption tower 25. Iodine is separated and purified by controlling the redox potential in the second reaction tank 311. The remaining iodine is completely oxidized and separated from bromide ions by controlling the redox potential in the fourth reaction tank 331. Finally, bromine is separated by adding an oxidant in the fifth reaction tank 341. This application utilizes the fact that iodine is solid at room temperature and the different redox potentials of bromine and iodine for staged reduction extraction. First, iodine is oxidized and separated. Then, an oxidant is added to separate the remaining iodine and some bromine. Finally, the remaining bromine is refined. This three-step extraction of iodine and bromine results in better separation and higher purity.

[0099] In summary, the system of this invention enables the separate extraction of bromine and iodine from salt lake brine. In high-concentration salt lake brine with high bromine and iodine levels, the concentration device 2 can be omitted, resulting in better economic benefits.

[0100] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A system for separating bromine and iodine from brine, characterized in that, The system includes a raw brine tank (1) and an iodine-bromine separation device (3) connected in sequence. The iodine-bromine separation device (3) includes an oxidation unit (31), a cooling sedimentation tank (32), a mother liquor treatment unit (33), and a bromine extraction device (34) connected in sequence. The oxidation unit (31) is connected to the raw brine tank (1). The iodine-bromine separation device (3) also includes an iodine element collection unit (35), which is connected to the cooling sedimentation tank (32). The mother liquor treatment unit (33) includes a reflux material outlet (335), which is connected to the oxidation unit (31).

2. The system for separating bromine and iodine from brine according to claim 1, characterized in that, The oxidation unit (31) includes a second reaction tank (311) and a third reaction tank (312) connected to each other. The second reaction tank (311) is connected to the original brine tank (1), and the third reaction tank (312) is connected to the cooling sedimentation tank (32).

3. The system for separating bromine and iodine from brine according to claim 2, characterized in that, The mother liquor treatment unit (33) includes a first distillation unit (332), and the cooling sedimentation tank (32), the first distillation unit (332), and the bromine extraction device (34) are connected in sequence. The first distillation unit (332) includes a reflux material outlet (335), and the reflux material outlet (335) is connected to the third reaction tank (312).

4. The system for separating bromine and iodine from brine according to claim 3, characterized in that, The mother liquor treatment unit (33) also includes a fourth reaction tank (331). The cooling sedimentation tank (32), the fourth reaction tank (331), the first distillation unit (332), and the bromine extraction device (34) are connected in sequence. The reflux material outlet (335) is connected to the third reaction tank (312).

5. The system for separating bromine and iodine from brine according to claim 2, characterized in that, The mother liquor treatment unit (33) includes a fourth reaction tank (331), a second stripping tower (333), and a second absorption tower (334). The cooling sedimentation tank (32), the fourth reaction tank (331), the second stripping tower (333), and the bromine extraction device (34) are connected in sequence. The second stripping tower (333) is connected to the second absorption tower (334). The second absorption tower (334) includes a reflux material outlet (335), which is connected to the second reaction tank (311).

6. The system for separating bromine and iodine from brine according to claim 1, characterized in that, The bromine extraction device (34) includes a fifth reaction tank (341), a second distillation unit (342), a rectification unit (343), and a pure bromine collection unit (344). The fifth reaction tank (341) is connected to the mother liquor treatment unit (33).

7. The system for separating bromine and iodine from brine according to claim 1, characterized in that, A concentration device (2) is provided between the raw brine tank (1) and the iodine-bromine separation device (3). The concentration device includes a filter (21), a regulator (22), a first reaction tank (23), a first stripping tower (24), and a first absorption tower (25) connected in sequence. The filter (21) is connected to the raw brine tank (1), and the first absorption tower (25) is connected to the oxidation unit (31).

8. The system for separating bromine and iodine from brine according to claim 7, characterized in that, It also includes one or more of the following conditions: A1) The regulator (22) includes a first acid inlet (221); A2) The first reaction tank (23) includes a first oxidant inlet (231); A3) The first stripping tower (24) includes a first hot air inlet (241) and a tail liquid outlet (242); A4) The first absorption tower (25) includes a first reducing agent inlet (251).

9. The system for separating bromine and iodine from brine according to claim 2, characterized in that, It also includes one or more of the following conditions: B1) The second reaction tank (311) includes a second acid inlet (3111); B2) The third reaction tank (312) includes a second oxidant inlet (3121).

10. The system for separating bromine and iodine from brine according to claim 4, characterized in that, It also includes one or more of the following conditions: C1) The fourth reaction tank (331) includes a third oxidant inlet (3311); C2) The first distillation unit (332) includes a second hot air inlet (3321).

11. The system for separating bromine and iodine from brine according to claim 5, characterized in that, It also includes one or more of the following conditions: D1) The second stripping tower (333) includes a third hot air inlet (3331); D2) The second absorption tower (334) includes a second reducing agent inlet (3341).

12. The system for separating bromine and iodine from brine according to claim 6, characterized in that, The fifth reaction tank (341) includes a fourth oxidant inlet (3411).

Images