CN211770721U - A refining system for sodium sulfate waste liquid in viscose fiber production - Google Patents
A refining system for sodium sulfate waste liquid in viscose fiber production Download PDFInfo
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- CN211770721U CN211770721U CN201922379956.8U CN201922379956U CN211770721U CN 211770721 U CN211770721 U CN 211770721U CN 201922379956 U CN201922379956 U CN 201922379956U CN 211770721 U CN211770721 U CN 211770721U
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Abstract
The utility model discloses a refined system for sodium sulfate waste liquid in viscose fiber production belongs to viscose fiber waste liquid purification treatment technical field. The device comprises a blending tank, a filter I, a filter II, a resin tower, a standing tank and a receiving tank, wherein the standing tank is arranged between the filter I and the filter II, and a passage for treating the sodium sulfate waste liquid is formed among the blending tank, the filter I, the standing tank, the filter II, the resin tower and the receiving tank; the blending tank comprises a tank body, a feeding hole, a discharging hole, a circulating reflux hole and a circulating outlet, and a circulating pipe is arranged between the circulating reflux hole and the circulating outlet. Through the setting of jar that stews, subside the remaining sediment impurity behind filter I, and then improve II filter efficiency and quality of filter, do the preparation work for follow-up resin tower absorption and bipolar membrane electrodialysis, and finally realize the refining to the sodium sulfate solution.
Description
Technical Field
The utility model relates to a refined system that is arranged in viscose fiber production sodium sulfate waste liquid especially relates to a refined system that is arranged in viscose fiber production bipolar membrane electrodialysis's sodium sulfate waste liquid belongs to viscose fiber waste liquid purification treatment technical field.
Background
The viscose fiber is a regenerated cellulose fiber which is processed by utilizing high polymer material wood pulp, cotton pulp and the like containing natural cellulose through chemical and mechanical methods, is a variety with the closest performance to the clothes of the natural fiber, has the characteristics of soft hand feeling, moisture absorption, ventilation, drapability, bright dyeing, antistatic property, easiness in textile processing and the like, is a regenerated cellulose fiber which is from nature but superior to the natural fiber, and is one of important materials of the raw materials of the textile industry. At present, about 40 viscose fiber enterprises exist in China, and besides producing common viscose fibers (long fibers and short fibers) and strong fibers, high wet modulus fibers and viscose fibers with special properties are also produced.
A large amount of chemical raw materials are needed in the production process of viscose, a large amount of waste water is generated, and the waste water contains sulfuric acid, zinc sulfate, carbon disulfide, cellulose, soluble organic matters and the like, which all cause great harm to the environment and are one of the main pollution sources of the textile industry. The sodium sulfate waste liquid is mainly generated in a spinning process in the viscose fiber production process, and an acid bath, namely sulfuric acid in the spinning process reacts with sodium hydroxide brought by a front-end process to generate sodium sulfate. In the spinning process, the content of sodium sulfate in the coagulating bath is continuously increased, so that the process requirements cannot be met, the redundant sodium sulfate in the acid bath is generally crystallized at high temperature, sodium sulfate crystals are separated, the content of the sodium sulfate in the acid bath meets the process requirements, acid does not need to be discharged every day to balance the acid bath, the sodium sulfate is directly supplied to a spinning workshop for continuous use after being fed, the acid discharge can be reduced, anhydrous sodium sulphate is produced, and the environment-friendly pressure is reduced. However, since the anhydrous sodium sulphate produced by high-temperature crystallization of sodium sulphate in the coagulation bath contains more impurities and has low added value, economic benefit cannot be generated, a large amount of solid salt cannot be treated, and certain pressure is still brought to environmental protection, sodium sulphate waste liquid obtained by dissolving sodium sulphate crystals by using pure water is further treated, and the sodium sulphate waste liquid contains sulfuric acid, zinc sulfate and a small amount of calcium and magnesium.
26.02/2014, a patent document with publication number CN203451221U entitled "a system for recovering acid and alkali from viscose sodium sulfate waste liquid by using bipolar membrane electrodialysis method" is disclosed, in which: the pretreatment device comprises a crystallization device, a pH adjusting device, a plate frame filter I, an O3 oxidation device, a plate frame filter II, an activated carbon adsorption column, an ion exchange resin device and a PP microporous filter which are sequentially connected.
In 2019, 08 and 30 months, a patent document with publication number CN209322625U and name "a recycling environmental protection treatment system for viscose waste liquid" is disclosed, wherein the patent document specifically discloses: centrifuge, transfer tank, allotment jar, coarse filtration device, smart filter equipment, resin tower, circulation jar and bipolar membrane device, this technical scheme forms circulation environmental protection processing system, accomplishes the recycle to sulphuric acid, sodium hydroxide, dilute sodium sulfate solution, simultaneously, the biggest recovery sulphuric acid, sodium hydroxide, dilute sodium sulfate solution to effectively guarantee the purity and the concentration of sulphuric acid, sodium hydroxide, and no secondary pollution in the processing procedure, can directly reuse in viscose fiber production process or store, realize the zero release. However, in the technical solution of the patent document, the sodium sulfate waste liquid is filtered by ultrafiltration (0.01 to 0.05 μm), and the precipitation cannot be treated as much as possible at the front end, which causes problems such as short service cycle of the ultrafiltration apparatus, frequent replacement and cleaning, etc., and the ultrafiltration precision is too high, the margin is large, and the price is expensive, and thus it is not suitable for refining the sodium sulfate waste liquid.
Disclosure of Invention
Based on the technical scheme in CN209322625U, the problem that the filter has short service cycle and is frequently replaced and cleaned due to the fact that precipitation is not effectively treated is solved, and a refining system for sodium sulfate waste liquid in viscose fiber production is provided. In the technical scheme, the standing tank is arranged between the filter I and the filter II, and the residual precipitated impurities after passing through the filter I are settled, so that the filtering efficiency and quality of the filter II are improved, preparation is also made for subsequent resin tower adsorption and bipolar membrane electrodialysis, and the refining of the sodium sulfate solution is finally realized.
In order to achieve the technical purpose, the following technical scheme is proposed:
a refining system for sodium sulfate waste liquid in viscose fiber production comprises a blending tank, a filter I connected with the blending tank, a filter II connected with the filter I, and a resin tower connected with the filter II, and further comprises a standing tank and a receiving tank, wherein the standing tank is arranged between the filter I and the filter II, the resin tower is connected with the receiving tank, and a passage for sodium sulfate waste liquid treatment is formed among the blending tank, the filter I, the standing tank, the filter II, the resin tower and the receiving tank;
the blending tank comprises a tank body, and a feed inlet, a discharge outlet, a circulating reflux port and a circulating outlet which are arranged on the tank body, wherein the feed inlet is arranged at the top of the tank body, the discharge outlet is arranged at the lower part of the tank body, and a circulating pipe is arranged between the circulating reflux port and the circulating outlet.
Preferably, the receiving tank is connected with a bipolar membrane electrodialysis system.
Preferably, at least two blending tanks are connected in parallel; the temperature, the pH value and the concentration of the solution can be adjusted, and suspended matters and precipitates are generated in the adjusting process.
Preferably, the circulating pipe is provided with a plate heat exchanger and a circulating pump, and the plate heat exchanger is arranged to heat the solution in the preparation tank and provide a suitable preparation environment; and the arrangement of the circulating pump is used for regulating and controlling the solution circulating process in the preparation tank.
Preferably, a columnar liquid level meter is arranged on the tank body.
Preferably, the number of the standing tanks is at least two, and the standing tanks are connected in parallel; and settling the residual precipitated impurities after passing through the filter I, and preparing for subsequent treatment.
Preferably, the resin towers are at least two, and are connected in parallel; the adsorption of free metal ions such as calcium, magnesium, zinc, iron and the like in the sodium sulfate solution is realized, so that other metal ions except sodium ions are removed, and the working efficiency and the quality of the bipolar membrane electrodialysis system are improved.
Preferably, the filter I is a bag filter, and the filtering precision is 5 um.
Preferably, the filter II is a bag filter, and the filtering precision is 0.5 um.
By adopting the technical scheme, the beneficial technical effects brought are as follows:
1) in the utility model, the standing tank is arranged between the filter I and the filter II, the residual precipitated impurities after passing through the filter I are settled, two times of filtration are added, the precipitated impurities are further removed, the filtration efficiency and quality of the filter II are further improved, preparation work is also carried out for subsequent resin tower adsorption and bipolar membrane electrodialysis, and the refining of the sodium sulfate solution is finally realized;
2) in the utility model, the structure of the blending tank is optimized, so that the refining efficiency of the sodium sulfate solution is greatly improved, the modulation time is shortened, and purer sodium sulfate solution raw materials are provided for bipolar membrane electrodialysis;
3) the utility model discloses in, use the bag filter of different precisions to cooperate, effectively get rid of sediment and other impurity, and solve prior art owing to adopt the super high ultrafiltration of precision, and arouse to wash and change frequent scheduling problem.
Drawings
FIG. 1 is a schematic diagram of the logic connection of the present invention;
FIG. 2 is a schematic structural diagram (I) of the middle dispensing tank of the present invention;
FIG. 3 is a schematic structural view (II) of the middle dispensing tank of the present invention;
FIG. 4 is a schematic diagram of the solution reflux in the blending tank of the present invention;
FIG. 5 is a schematic structural view of a resin tower according to the present invention;
wherein, in the figure: 1. the device comprises a blending tank, 11, a tank body, 12, a feeding port, 13, a discharging port, 14, a circulating reflux port, 15, a circulating outlet, 2, a filter I, 3, a standing tank, 4, a filter II, 5, a resin tower, 6, a receiving tank, 7, a plate heat exchanger, 8, a circulating pump, 9, a columnar liquid level meter, 10 and a circulating pipe.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
A refining system for sodium sulfate waste liquid in viscose fiber production comprises a blending tank 1, a filter I2 connected with the blending tank 1, a filter II 4 connected with the filter I2, and a resin tower 5 connected with the filter II 4, and further comprises a standing tank 3 and a receiving tank 6 connected with a bipolar membrane electrodialysis system, wherein the standing tank 3 is arranged between the filter I2 and the filter II 4, the resin tower 5 is connected with the receiving tank 6, and a passage for sodium sulfate waste liquid treatment is formed among the blending tank 1, the filter I2, the standing tank 3, the filter II 4, the resin tower 5 and the receiving tank 6;
the blending tank 1 comprises a tank body 11, and a feeding hole 12, a discharging hole 13, a circulating reflux hole 14 and a circulating outlet 15 which are arranged on the tank body 11, wherein the feeding hole 12 is arranged at the top of the tank body 11, the discharging hole 13 is arranged at the lower part of the tank body 11, and a circulating pipe 10 is arranged between the circulating reflux hole 14 and the circulating outlet 15.
Example 2
Based on example 1, further,
the number of the blending tanks 1 is two, and the blending tanks 1 are connected in parallel; the temperature, the pH value and the concentration of the solution can be adjusted, and suspended matters are generated in the adjusting process.
Example 3
Based on example 2, it is further preferred that,
the circulating pipe 10 is provided with a plate type heat exchanger 7 and a circulating pump 8, and the arrangement of the plate type heat exchanger 7 heats the solution in the preparation tank 1 to provide a suitable preparation environment; the arrangement of the circulating pump 8 is used for regulating and controlling the solution circulating process in the distribution tank 1; the tank body 11 is provided with a column-shaped liquid level meter 9.
Example 4
Based on example 3, it is further preferred that,
the number of the standing tanks 3 is three, and the standing tanks 3 are connected in parallel; the precipitated impurities remaining after the sedimentation through the filter I2 prepare for the subsequent treatment.
Example 5
Based on example 4, it is further preferred that,
the number of the resin towers 5 is two, and the resin towers 5 are connected in parallel; the adsorption of free metal ions such as calcium, magnesium, zinc, iron and the like in the sodium sulfate solution is realized, so that other metal ions except sodium ions are removed, and the working efficiency and the quality of the bipolar membrane electrodialysis system are improved.
Example 6
Based on example 5, it is further preferred that,
the filter I2 is a bag filter, and the filtering precision is 5 um; and the filter II 4 is a bag filter, and the filtering precision is 0.5 um.
Example 7
As shown in fig. 1: a refining system for sodium sulfate waste liquid in viscose fiber production comprises a blending tank 1, a filter I2 connected with the blending tank 1, a filter II 4 connected with the filter I2, and a resin tower 5 (shown in figure 5) connected with the filter II 4, and further comprises a standing tank 3 and a receiving tank 6 connected with a bipolar membrane electrodialysis system, wherein the standing tank 3 is arranged between the filter I2 and the filter II 4, the resin tower 5 is connected with the receiving tank 6, all equipment devices are connected through pipelines or flanges, and a passage for sodium sulfate waste liquid treatment is formed among the blending tank 1, the filter I2, the standing tank 3, the filter II 4, the resin tower 5 and the receiving tank 6;
as shown in fig. 2 and 3: the blending tank 1 comprises a tank body 11, and a feed inlet 12, a discharge outlet 13, a circulating reflux port 14 and a circulating outlet 15 which are arranged on the tank body 11, wherein the feed inlet 12 is arranged at the top of the tank body 11, the discharge outlet 13 is arranged at the lower part of the tank body 11, a circulating pipe 10 is arranged between the circulating reflux port 14 and the circulating outlet 15, a plate heat exchanger 7 and a circulating pump 8 are arranged on the circulating pipe 10, and a columnar liquid level meter 9 is arranged on the tank body 11. According to actual requirements, an overflow port, a pH meter reserved port, an exhaust port, a liquid level meter reserved port, a drain port, a thermometer reserved port and a conductivity meter reserved port are arranged on the tank body 11, and the corresponding liquid level meter, the corresponding thermometer, the corresponding conductivity meter, the corresponding pH meter and the corresponding flow meter are used for respectively detecting liquid level, temperature, conductivity, pH value and flow and feeding back to a DCS control computer. The bottom of the blending tank 1 is oval, and is supported by a skirt bottom, a central column and a bottom rib, a sewage discharge port is arranged at the bottom end of the tank body 11 so as to discharge sewage thoroughly, solution circulates out from a circulation outlet 15 and then flows back from a circulation return port 14, the circulation return port 14 is tangent to the tank body 11 at the top of the side face of the blending tank 1, the solution flows back to cause vortex inside the tank body 11 (as shown in figure 4), a discharge port 13 is arranged above sediment generated due to pH change, so that supernatant can be extracted, only a small amount of sediment enters the standing tank 3, a heat exchanger is arranged on a circulation pipe 10 of the blending tank 1, the heating function can be realized, a liquid level meter, a thermometer and a conductivity meter reserved port are designed at the bottom of the tank body 11, a pH meter reserved port is arranged in the middle of the side face of the tank body 11, and the like.
According to actual requirements, pumps and pneumatic valves are arranged on the conveying pipes, so that the solution conveying is convenient to control and adjust.
In viscose fiber production process, the sodium sulfate waste liquid that the acid bath produced, obtain the higher sodium sulfate waste liquid of concentration through the concentrated acid crystallization system in acid station, contain sulphuric acid in the sodium sulfate waste liquid, zinc sulfate and a small amount of free calcium magnesium ion, the bag filter who adopts different precisions cooperates and effectively gets rid of sediment and other impurity, obtain the sodium sulfate solution that accords with the technological requirement, increase solitary jar 3 that stews simultaneously, increase twice and filter, the rational arrangement equipment quantity, this waste liquid passes through multistage filtration absorption promptly and obtains pure sodium sulfate in order to supply with bipolar membrane electrodialysis system and further handle again, specifically include: the sodium sulfate waste liquid enters a blending tank 1 through an acid station centrifuge, enters a filter I2 after blending is finished, and is subjected to coarse filtration through the filter I2; and after the coarse filtration is finished, the mixture enters a standing tank 3 for sedimentation, after the sedimentation is finished, the mixture enters a filter II 4 for fine filtration, then enters a resin tower 5, passes through the resin tower 5 and then is conveyed into a bipolar membrane electrodialysis system. The refining system is a raw material pretreatment system for bipolar membrane electrodialysis and can adopt automatic control or semi-automatic control.
In the technical scheme, by improving the structure of the preparation tank 1 and arranging the standing tank 3, compared with the pretreatment of the sodium sulfate waste liquid of bipolar membrane electrodialysis in the prior art (such as CN 209322625U), the method has the advantages that the cost is saved by more than 500 ten thousand yuan, the service life of a fine filter is prolonged by at least 5 days, the service life of a resin tower 5 is prolonged by at least 180 days, and the service life of a bipolar membrane system is prolonged by at least 180 days; the cleaning interval period of the equipment in the system is increased by at least 3 days, namely, the refining efficiency is improved by about 85 percent.
Claims (9)
1. The utility model provides a refined system for sodium sulfate waste liquid in viscose fiber production, includes allotment jar (1), filter I (2) be connected with allotment jar (1), filter II (4) be connected with filter I (2) and resin tower (5) be connected with filter II (4), its characterized in that: the refining system further comprises a standing tank (3) and a receiving tank (6), wherein the standing tank (3) is arranged between the filter I (2) and the filter II (4), the resin tower (5) is connected with the receiving tank (6), and a passage for treating sodium sulfate waste liquid is formed among the blending tank (1), the filter I (2), the standing tank (3), the filter II (4), the resin tower (5) and the receiving tank (6);
the blending tank (1) comprises a tank body (11), and a feed inlet (12), a discharge outlet (13), a circulating reflux port (14) and a circulating outlet (15) which are arranged on the tank body (11), wherein the feed inlet (12) is arranged at the top of the tank body (11), the discharge outlet (13) is arranged at the lower part of the tank body (11), and a circulating pipe (10) is arranged between the circulating reflux port (14) and the circulating outlet (15).
2. The refining system for the sodium sulfate waste liquid in the viscose fiber production according to claim 1, is characterized in that: the receiving tank (6) is connected with the bipolar membrane electrodialysis system.
3. The refining system for the sodium sulfate waste liquid in the viscose fiber production according to claim 1, is characterized in that: the number of the blending tanks (1) is at least two, and the blending tanks (1) are connected in parallel.
4. The refining system for sodium sulfate waste liquid in viscose fiber production according to claim 1 or 3, characterized in that: and a plate type heat exchanger (7) and a circulating pump (8) are arranged on the circulating pipe (10).
5. The refining system for the sodium sulfate waste liquid in the viscose fiber production according to claim 4, is characterized in that: the tank body (11) is provided with a columnar liquid level meter (9).
6. The refining system for the sodium sulfate waste liquid in the viscose fiber production according to claim 1, is characterized in that: the number of the standing tanks (3) is at least two, and the standing tanks (3) are connected in parallel.
7. The refining system for the sodium sulfate waste liquid in the viscose fiber production according to claim 1, is characterized in that: the number of the resin towers (5) is at least two, and the resin towers (5) are connected in parallel.
8. The refining system for the sodium sulfate waste liquid in the viscose fiber production according to claim 1, is characterized in that: filter I (2) is bag filter, and filter fineness is 5 um.
9. The refining system for sodium sulfate waste liquid in viscose fiber production according to claim 1 or 8, characterized in that: and the filter II (4) is a bag filter, and the filtering precision is 0.5 um.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112479448A (en) * | 2020-12-02 | 2021-03-12 | 南京顺水达环保科技有限公司 | Electrodialysis device and method for on-line electrolysis preparation of acid and alkali by using wastewater |
| CN112758957A (en) * | 2020-12-28 | 2021-05-07 | 宜宾丝丽雅股份有限公司 | Process for purifying sodium hydroxide concentration by electrodialysis |
| CN113371909A (en) * | 2021-06-08 | 2021-09-10 | 中石化南京化工研究院有限公司 | Method for recycling wastewater generated in methanol synthesis catalyst production |
| CN113877303A (en) * | 2021-11-08 | 2022-01-04 | 唐山三友集团兴达化纤有限公司 | System and method for filtering squeezed liquid in viscose fiber production |
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2019
- 2019-12-26 CN CN201922379956.8U patent/CN211770721U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479448A (en) * | 2020-12-02 | 2021-03-12 | 南京顺水达环保科技有限公司 | Electrodialysis device and method for on-line electrolysis preparation of acid and alkali by using wastewater |
| CN112758957A (en) * | 2020-12-28 | 2021-05-07 | 宜宾丝丽雅股份有限公司 | Process for purifying sodium hydroxide concentration by electrodialysis |
| CN113371909A (en) * | 2021-06-08 | 2021-09-10 | 中石化南京化工研究院有限公司 | Method for recycling wastewater generated in methanol synthesis catalyst production |
| CN113877303A (en) * | 2021-11-08 | 2022-01-04 | 唐山三友集团兴达化纤有限公司 | System and method for filtering squeezed liquid in viscose fiber production |
| CN113877303B (en) * | 2021-11-08 | 2023-02-21 | 唐山三友集团兴达化纤有限公司 | System and method for filtering squeezed liquid in viscose fiber production |
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