CN211971978U - System for extracting iodine from waste solution of polaroid manufacturing process - Google Patents
System for extracting iodine from waste solution of polaroid manufacturing process Download PDFInfo
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- CN211971978U CN211971978U CN202020025005.0U CN202020025005U CN211971978U CN 211971978 U CN211971978 U CN 211971978U CN 202020025005 U CN202020025005 U CN 202020025005U CN 211971978 U CN211971978 U CN 211971978U
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Abstract
The utility model discloses a system for extracting iodine from waste solution of polaroid process, which comprises a cooling crystallization tank, a borax dehydrator, a filtrate relay tank, a first filtrate collecting tank, a crude iodine dehydrator and a second filtrate collecting tank which are connected in sequence; the inlet end of the cooling crystallization tank is connected with a waste solution inlet pipe; a borax collecting tank is arranged at the solid outlet end of the borax dehydrator; the inlet end of the filtrate relay tank is connected with a sulfuric acid storage barrel and a sodium hypochlorite storage barrel through a sulfuric acid inlet pipe and a sodium hypochlorite inlet pipe respectively; a solid outlet end of the coarse iodine dehydrator is provided with a coarse iodine collecting tank; the inlet end of the second filtrate collecting tank is connected with a sodium hydroxide storage barrel and a sodium thiosulfate storage barrel through a sodium hydroxide inlet pipe and a sodium thiosulfate inlet pipe respectively, and the outlet end of the second filtrate collecting tank is connected with a treatment fluid outlet pipe. The utility model discloses can refine higher purity iodine, the rate of recovery is high, and the feature of environmental protection is strong, and system degree of automation is high, has reduced labour and cost.
Description
Technical Field
The utility model belongs to the technical field of chemical industry equipment, concretely relates to refine system of iodine in useless solution from polaroid processing procedure.
Background
Iodine is a strategic material, is mainly used for preparing medicaments, dyes, iodine, test paper, iodine compounds and the like, and has wide market prospect. The polarizer manufacturing process generates a waste solution containing potassium iodide, and the problem of extracting iodine from the waste solution is faced by various polarizer manufacturers. At present, no matching equipment for refining iodine aiming at the waste solution of the polaroid manufacturing process exists, and the iodine refining equipment used in other fields is difficult to be directly used for treating the waste solution of the polaroid manufacturing process on one hand, and on the other hand, the problems of low automation degree of the equipment, high labor intensity, incomplete iodine refining, low refining efficiency and the like exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the prior art, provide a system for refining iodine from the waste solution of polaroid processing procedure, can refine higher purity iodine, the rate of recovery is high, and the feature of environmental protection is strong, and system's degree of automation is high, has reduced labour and cost.
The utility model provides a following technical scheme:
a system for extracting iodine from a waste solution in a polaroid manufacturing process comprises a cooling crystallization tank, a borax dehydrator, a filtrate relay tank, a first filtrate collecting tank, a crude iodine dehydrator and a second filtrate collecting tank which are sequentially connected;
the inlet end of the cooling crystallization tank is connected with a waste solution inlet pipe;
a borax collecting tank is arranged at the solid outlet end of the borax dehydrator;
the inlet end of the filtrate relay tank is connected with a sulfuric acid storage barrel and a sodium hypochlorite storage barrel through a sulfuric acid inlet pipe and a sodium hypochlorite inlet pipe respectively;
a solid outlet end of the coarse iodine dehydrator is provided with a coarse iodine collecting tank;
the inlet end of the second filtrate collecting tank is connected with a sodium hydroxide storage barrel and a sodium thiosulfate storage barrel through a sodium hydroxide inlet pipe and a sodium thiosulfate inlet pipe respectively, and the outlet end of the second filtrate collecting tank is connected with a treatment fluid outlet pipe.
Preferably, jackets are arranged outside the cooling crystallization tank and the first filtrate collecting tank, and the jackets are connected with a cold water inlet pipe and a cold water outlet pipe.
Preferably, a first lifting groove is connected between the borax dehydrator and the filtrate relay groove, and a second lifting groove is connected between the coarse iodine dehydrator and the second filtrate collecting groove.
Preferably, liquid pumps are arranged among the cooling crystallization tank, the borax dehydrator, the filtrate relay tank, the first filtrate collecting tank, the crude iodine dehydrator and the second filtrate collecting tank which are connected.
Preferably, a first return pipe is connected between the cooling crystallization tank and the filtrate relay tank, and a first valve is mounted on the first return pipe.
Preferably, a second return pipe is connected between the first filtrate collecting tank and the second filtrate collecting tank, and a second valve is mounted on the second return pipe.
Preferably, the cooling crystallization tank and the filtrate relay tank are both connected with a tap water inlet pipe, and a water inlet valve is mounted on the tap water inlet pipe.
Preferably, dosing pumps are arranged between the sulfuric acid storage barrel and the sulfuric acid inlet pipe, between the sodium hypochlorite storage barrel and the sodium hypochlorite inlet pipe, between the sodium hydroxide storage barrel and the sodium hydroxide inlet pipe, and between the sodium thiosulfate storage barrel and the sodium thiosulfate inlet pipe, and comprise a rough adjusting pump and a fine adjusting pump.
A method for extracting iodine from waste solution of polarizer manufacturing process comprises the following steps:
introducing a waste solution of the polaroid process into a cooling crystallization tank through a waste solution inlet pipe, introducing into a borax dehydrator for solid-liquid separation after cooling crystallization, discharging the obtained solid borax into a borax collecting tank, and allowing the obtained primary treatment liquid to flow into a filtrate relay tank;
sulfuric acid in a sulfuric acid storage barrel and sodium hypochlorite in a sodium hypochlorite storage barrel are respectively injected into a filtrate relay tank through a sulfuric acid inlet pipe and a sodium hypochlorite inlet pipe, and react with the primary treatment liquid to obtain secondary treatment liquid containing iodine simple substances;
introducing the secondary treatment liquid into a first filtrate collecting tank, cooling and crystallizing, introducing into a crude iodine dehydrator, discharging the obtained solid crude iodine into a crude iodine collecting tank, and allowing the obtained tertiary treatment liquid to flow into a second filtrate collecting tank;
and sodium hydroxide in the sodium hydroxide storage barrel and sodium thiosulfate in the sodium thiosulfate storage barrel are respectively injected into the second filtrate collecting tank through a sodium hydroxide inlet pipe and a sodium thiosulfate inlet pipe, the third-stage treatment liquid is subjected to decoloration treatment, and a fourth-stage treatment liquid is obtained and flows to a sewage station through a treatment liquid outlet pipe for treatment.
Preferably, the temperature for cooling and crystallizing the waste solution and the secondary treatment solution in the polarizer manufacturing process is 7 ℃.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model provides a system and method for refining iodine separates the borax in the waste solution through cooling crystallization tank and borax hydroextractor earlier, then obtains iodine simple substance with the potassium iodide reaction of sulphuric acid and sodium hypochlorite and treatment fluid again to refine out simple substance iodine through first filtrating collecting vat and thick iodine hydroextractor, avoided borax to mix wherein, the iodine purity that refines is high, has realized changing waste into valuables, resource recovery again, and the feature of environmental protection is strong;
(2) the system and the method for extracting iodine provided by the utility model further decolor the treatment fluid by sodium hydroxide and sodium thiosulfate after extracting iodine, reduce pollutants, and the decolored treatment fluid can reach the discharge standard after being simply treated in a sewage station in a factory, thus being safe and pollution-free;
(3) the utility model provides a system for refine iodine, simple structure, equipment occupation of land space is little, and the operation of the real-time remote monitoring of accessible computer has reduced the manpower, and the cost is reduced has improved the treatment effeciency of useless solution and the efficiency of refining of iodine.
Drawings
FIG. 1 is a schematic diagram of a system for extracting iodine according to the present invention;
labeled as: 1. cooling the crystallization tank; 2. a borax dehydrator; 3. a first lifting groove; 4. a filtrate relay tank; 5. a first filtrate collection tank; 6. a coarse iodine dehydrator; 7. a second lifting groove; 8. a second filtrate collection tank; 9. a sulfuric acid storage barrel; 10. a sodium hypochlorite storage barrel; 11. a sodium hydroxide storage barrel; 12. a sodium thiosulfate storage barrel; 13. a superior sulfuric acid storage barrel; 14. a higher-level sodium hydroxide storage barrel; 15. a cold water inlet pipe; 16. a cold water outlet pipe; 17. feeding a waste solution into a pipe; 18. a liquid pump; 19. a tap water inlet pipe; 20. a borax collecting tank; 21. a first return pipe; 22. a second return pipe; 23. a crude iodine collecting tank; 24. coarse adjustment of the pump; 25. fine-tuning the pump; 26. feeding sulfuric acid into the pipe; 27. feeding sodium hypochlorite into a pipe; 28. a first liquid inlet pipe; 29. feeding sodium hydroxide into a pipe; 30. feeding sodium thiosulfate into a pipe; 31. a second liquid inlet pipe; 32. a treatment liquid outlet pipe; 33. a first valve; 34. a second valve; 35. a water inlet valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
As shown in fig. 1, a system for extracting iodine from a waste solution of a polarizer process includes a cooling crystallization tank 1, a borax dehydration machine 2, a filtrate relay tank 4, a first filtrate collection tank 5, a crude iodine dehydration machine 6 and a second filtrate collection tank 8, which are connected in sequence; the inlet end of the cooling crystallization tank 1 is connected with a waste solution inlet pipe 17; a borax collecting tank 20 is arranged at the solid outlet end of the borax dehydrator 2; the inlet end of the filtrate relay tank 4 is respectively connected with the liquid outlet end of the borax dehydrator 2, the sulfuric acid storage barrel 9 and the sodium hypochlorite storage barrel 10 through a first liquid inlet pipe 28, a sulfuric acid inlet pipe 26 and a sodium hypochlorite inlet pipe 27; a solid outlet end of the crude iodine dehydrator 6 is provided with a crude iodine collecting tank 23; the inlet end of the second filtrate collecting tank 8 is connected with the liquid outlet end of the crude iodine dehydrator 6, the sodium hydroxide storage barrel 11 and the sodium thiosulfate storage barrel 12 through a second liquid inlet pipe 31, a sodium hydroxide inlet pipe 29 and a sodium thiosulfate inlet pipe 30, and the outlet end is connected with a treatment liquid outlet pipe 32.
The cooling crystallization tank 1 and the first filtrate collecting tank 5 are externally provided with clamping sleeves, the clamping sleeves are internally provided with coil pipes, the clamping sleeves are connected with a cold water inlet pipe 15 and a cold water outlet pipe 16, the cold water inlet pipe 15 is provided with a cold water valve, cold water is injected from the cold water inlet pipe 15, the cold water circulates in the coil pipes and flows out from the cold water outlet pipe 16, the temperature in the cooling crystallization tank 1 and the first filtrate collecting tank 5 is favorably reduced, and the cooling crystallization of borax and iodine simple substances is facilitated.
First lifting groove 3 is connected between borax hydroextractor 2 and filtrating relay tank 4, is connected with second lifting groove 7 between thick iodine hydroextractor 6 and second filtrating collecting vat 8, and first lifting groove 3 and second lifting groove 7 are used for keeping in the treatment fluid, let in filtrating relay tank 4 and second filtrating collecting vat 8 respectively through the liquid pump after the treatment fluid reaches the settlement liquid level.
Liquid pumps 18 are arranged among the cooling crystallization tank 1, the borax dehydrator 2, the filtrate relay tank 4, the first filtrate collecting tank 5, the crude iodine dehydrator 6 and the second filtrate collecting tank 8 which are connected with each other, so that the flow of treatment liquid among the devices is realized; and stirrers are arranged on the cooling crystallization tank 1, the filtrate relay tank 4, the first filtrate collecting tank 5 and the second filtrate collecting tank 8, and are used for promoting the uniform mixing of all solutions in the tanks and improving the reaction rate or the cooling crystallization rate.
A first return pipe 21 is connected between the cooling crystallization tank 1 and the filtrate relay tank 4, a first valve 33 is installed on the first return pipe 21, the first valve 33 is opened, and the potassium iodide solution which is not completely reacted in the filtrate relay tank 4 flows back to the cooling crystallization tank 1 through the first return pipe 21 for secondary treatment, so that the iodine extraction rate is improved.
And a second return pipe 22 is connected between the first filtrate collecting tank 5 and the second filtrate collecting tank 8, a second valve 34 is installed on the second return pipe 22, the second valve 34 is opened, and the treatment liquid which is not completely decolorized or is incompletely crystallized by cooling iodine simple substances in the second filtrate collecting tank 8 flows to the first filtrate collecting tank 5 through the second return pipe 22 for secondary treatment, so that the iodine extraction rate is improved.
The cooling crystallization tank 1 and the filtrate relay tank 4 are both connected with a tap water inlet pipe 19, a water inlet valve 35 is mounted on the tap water inlet pipe 19, the water inlet valve 35 is opened, tap water is injected from the tap water pipe 19, and the cooling crystallization tank 1, the borax dehydrator 2, the first lifting tank 3, the filtrate relay tank 4 and other devices can be cleaned without manual cleaning equipment, so that the labor intensity of workers is reduced.
Dosing pumps are arranged between the sulfuric acid storage barrel 9 and the sulfuric acid inlet pipe 26, between the sodium hypochlorite storage barrel 10 and the sodium hypochlorite inlet pipe 27, between the sodium hydroxide storage barrel 11 and the sodium hydroxide inlet pipe 29 and between the sodium thiosulfate storage barrel 12 and the sodium thiosulfate inlet pipe 30, and comprise a rough adjusting pump 24 and a fine adjusting pump 25. The inlet end of sulphuric acid storage bucket 9 is connected with higher level sulphuric acid storage bucket 13, and the inlet end of sodium hydroxide storage bucket 11 is connected with higher level sodium hydroxide storage bucket 14, and higher level sulphuric acid storage bucket 13 and higher level sodium hydroxide storage bucket 14 are used for storing high concentration's sulphuric acid and sodium hydroxide, dilute in sulphuric acid storage bucket 9 and sodium hydroxide storage bucket 11 when needing to use.
Example 2
A method for extracting iodine from waste solution of polarizer manufacturing process comprises the following steps:
(1) introducing a waste solution (potassium iodide concentration is about 12%) in a polaroid manufacturing process into a cooling crystallization tank 1 through a waste solution inlet pipe 17, synchronously opening a stirrer and a cold water valve of the cooling crystallization tank 1, introducing cold water with the temperature of 7 ℃ from a cold water inlet pipe 15, arranging a liquid level meter in the cooling crystallization tank 1, stopping feeding after the preset liquid level is reached, circulating the cold water in a jacket to cool and crystallize the waste solution for 100min, introducing a borax dehydrator 2 through a liquid pump 18 to perform solid-liquid separation, discharging obtained solid borax into a borax collecting tank 20, and allowing obtained primary treatment liquid to flow into a filtrate relay tank 4 through a first lifting tank 3 and the liquid pump;
(2) the stirrer of the filtrate relay tank 4 is synchronously started, a liquid level meter, a pH meter and an ORP meter are arranged in the filtrate relay tank 4, feeding is stopped when the primary treatment liquid reaches a set liquid level, sulfuric acid in a sulfuric acid storage barrel 9 and sodium hypochlorite in a sodium hypochlorite storage barrel 10 are respectively injected into the filtrate relay tank 4 through a sulfuric acid inlet pipe 26 and a sodium hypochlorite inlet pipe 27, the pH value of the sulfuric acid is adjusted to be 2.2 +/-0.2, the ORP value of the sodium hypochlorite is adjusted to be 190 +/-10, the sulfuric acid, the sodium hypochlorite and the primary treatment liquid react to obtain secondary treatment liquid containing iodine simple substances, and the reaction equation is as follows:
NaClO + 2 KI + H2SO4→ I2 + NaCl + K2SO4 + H2O；
(3) introducing the secondary treatment liquid into a first filtrate collecting tank 5 through a liquid pump, synchronously starting a stirrer and a cold water valve, introducing cold water with the temperature of 7 ℃ into a jacket, cooling and crystallizing for 100min, introducing the crude iodine into a crude iodine dehydrator 6 through the liquid pump, discharging the obtained solid crude iodine into a crude iodine collecting tank 23, and allowing the obtained tertiary treatment liquid to flow into a second filtrate collecting tank 8 through a second lifting tank 7 and the liquid pump;
(4) and (3) synchronously starting the stirrer of the second filtrate collecting tank 8, injecting sodium hydroxide in the sodium hydroxide storage barrel 11 and sodium thiosulfate in the sodium thiosulfate storage barrel 12 into the second filtrate collecting tank 8 through a sodium hydroxide inlet pipe 29 and a sodium thiosulfate inlet pipe 30 respectively, decoloring the tertiary treatment liquid, obtaining a fourth-stage treatment liquid, flowing to a sewage station through a treatment liquid outlet pipe 32 for treatment, and discharging the treated water into a municipal sewage pipe network, wherein the treated water meets the three-stage standard of Integrated wastewater discharge Standard (GB 8978-1996).
Embodiment 1 and 2 provide the utility model provides a system and method for refining iodine from waste solution of polaroid processing procedure, earlier through cooling crystallizing tank and borax hydroextractor with the borax separation in the waste solution, then obtain the iodine simple substance with the potassium iodide reaction of sulphuric acid and sodium hypochlorite and treatment fluid again to refine out simple substance iodine through first filtrating collecting vat and crude iodine hydroextractor, avoided borax to mix wherein, the iodine purity who refines is high, realized changing waste into valuables, the resource is retrieved again, the feature of environmental protection is strong; after iodine is refined, sodium hydroxide and sodium thiosulfate are used for further decoloring the treatment liquid, so that pollutants are reduced, the decolored treatment liquid can reach the discharge standard after being simply processed in a sewage station in a factory, and the treatment liquid is safe and pollution-free; wherein refine the system of iodine, simple structure, equipment occupation of land space is little, and the real-time remote monitoring operation of accessible computer has reduced the manpower, and the cost is reduced has improved the treatment effeciency of useless solution and the efficiency of refining of iodine.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (8)
1. A system for extracting iodine from a waste solution in a polaroid manufacturing process is characterized by comprising a cooling crystallization tank, a borax dehydrator, a filtrate relay tank, a first filtrate collecting tank, a crude iodine dehydrator and a second filtrate collecting tank which are sequentially connected;
the inlet end of the cooling crystallization tank is connected with a waste solution inlet pipe;
a borax collecting tank is arranged at the solid outlet end of the borax dehydrator;
the inlet end of the filtrate relay tank is connected with a sulfuric acid storage barrel and a sodium hypochlorite storage barrel through a sulfuric acid inlet pipe and a sodium hypochlorite inlet pipe respectively;
a solid outlet end of the coarse iodine dehydrator is provided with a coarse iodine collecting tank;
the inlet end of the second filtrate collecting tank is connected with a sodium hydroxide storage barrel and a sodium thiosulfate storage barrel through a sodium hydroxide inlet pipe and a sodium thiosulfate inlet pipe respectively, and the outlet end of the second filtrate collecting tank is connected with a treatment fluid outlet pipe.
2. The system of claim 1, wherein a jacket is provided outside the cooling crystallization tank and the first filtrate collection tank, and the jacket is connected with a cold water inlet pipe and a cold water outlet pipe.
3. The system of claim 1, wherein a first lifting groove is connected between the borax water extractor and the filtrate relay groove, and a second lifting groove is connected between the crude iodine water extractor and the second filtrate collecting groove.
4. The system of claim 1, wherein a liquid pump is disposed between the cooling crystallization tank, the borax water extractor, the filtrate relay tank, the first filtrate collecting tank, the crude iodine water extractor, and the second filtrate collecting tank.
5. The system of claim 1, wherein a first return pipe is connected between the cooling crystallization tank and the filtrate relay tank, and the first return pipe is provided with a first valve.
6. The system of claim 1, wherein a second return pipe is connected between the first filtrate collecting tank and the second filtrate collecting tank, and a second valve is installed on the second return pipe.
7. The system of claim 1, wherein the cooling crystallization tank and the filtrate relay tank are connected to a tap water inlet pipe, and a water inlet valve is installed on the tap water inlet pipe.
8. The system of claim 1, wherein dosing pumps are disposed between the sulfuric acid storage barrel and the sulfuric acid inlet pipe, between the sodium hypochlorite storage barrel and the sodium hypochlorite inlet pipe, between the sodium hydroxide storage barrel and the sodium hydroxide inlet pipe, and between the sodium thiosulfate storage barrel and the sodium thiosulfate inlet pipe, and comprise a rough adjustment pump and a fine adjustment pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020025005.0U CN211971978U (en) | 2020-01-07 | 2020-01-07 | System for extracting iodine from waste solution of polaroid manufacturing process |
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| CN202020025005.0U CN211971978U (en) | 2020-01-07 | 2020-01-07 | System for extracting iodine from waste solution of polaroid manufacturing process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111099770A (en) * | 2020-01-07 | 2020-05-05 | 昆山之奇美材料科技有限公司 | System and method for extracting iodine from waste solution of polaroid manufacturing process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111099770A (en) * | 2020-01-07 | 2020-05-05 | 昆山之奇美材料科技有限公司 | System and method for extracting iodine from waste solution of polaroid manufacturing process |
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Address after: 215300 No.111 Jianhu Road, Photoelectric Industrial Park, Kunshan Development Zone, Suzhou City, Jiangsu Province Patentee after: Hengmei optoelectronics Co.,Ltd. Address before: 215300 No.111 Jianhu Road, Photoelectric Industrial Park, Kunshan Development Zone, Suzhou City, Jiangsu Province Patentee before: KUNSHAN ZHIQIMEI MATERIAL TECHNOLOGY Co.,Ltd. |