A comprehensive utilization system of brine refining wastewater in caustic soda production

Abstract

The utility model discloses a kind of comprehensive utilization system of salt water refining wastewater in caustic soda production, it is related to caustic soda production wastewater treatment technical field, including resin tower, acidic wastewater pipe is connected with resin tower, alkaline wastewater pipe is connected with resin tower, acidic recovery tank is connected with acidic wastewater pipe, anode liquid tank is connected with acidic recovery tank, dechlorination tower is connected with anode liquid tank, alkaline recovery tank is connected with alkaline wastewater pipe, baffle tank is connected with alkaline recovery tank;Through recycling to acidic and alkaline wastewater generated by resin tower reproduction, replace the high-purity hydrochloric acid and caustic soda solution originally required to be used in production process, to reduce production cost, reduce environmental pollution, realize the efficient use of resources.

Description

Technical Field

[0001] This utility model relates to the field of caustic soda production wastewater treatment technology, specifically a comprehensive utilization system for brine refining wastewater in caustic soda production. Background Technology

[0002] In the ion-exchange membrane caustic soda production process, the secondary brine chelation resin tower requires acid-base regeneration, a process that consumes large amounts of caustic soda and hydrochloric acid. The acid washing stage generates a large amount of acidic wastewater, while the alkali washing stage generates a large amount of alkaline wastewater. Currently, this acidic and alkaline wastewater is ultimately neutralized to form neutral or alkaline water for use as brine. However, in actual operation, because the acidic wastewater has a higher acid content than the alkaline wastewater, additional caustic soda solution needs to be added to neutralize or alkaline wastewater to achieve neutrality or alkalinity. This results in a large consumption of caustic soda during production, increasing production costs and wasting resources. Utility Model Content

[0003] The purpose of this invention is to provide a comprehensive utilization system for brine refining wastewater in caustic soda production. By recycling and utilizing the acidic and alkaline wastewater generated during resin tower regeneration, the system can replace the high-purity hydrochloric acid and caustic soda solution originally required in the production process, thereby reducing production costs, minimizing environmental pollution, and achieving efficient resource utilization.

[0004] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: a comprehensive utilization system for brine refining wastewater in caustic soda production, including a resin tower;

[0005] An acidic wastewater pipe is connected to the resin tower.

[0006] An alkaline wastewater pipe is connected to the resin tower.

[0007] An acid recovery tank is connected to the acid wastewater pipe;

[0008] An anolyte tank, which is connected to the acid recovery tank;

[0009] A dechlorination tower is connected to the anolyte tank.

[0010] An alkaline recovery tank is connected to the alkaline wastewater pipe;

[0011] A baffle trough is connected to the alkaline recovery tank.

[0012] In some embodiments, an acid storage tank is also included, which is disposed between the acid recovery tank and the anolyte tank.

[0013] In some embodiments, an acid level gauge is also included, which is disposed on the acid recovery tank;

[0014] An acid control valve is provided between the acid storage tank and the acid recovery tank and is electrically connected to the acid level gauge.

[0015] In some embodiments, an alkaline storage tank is also included, which is disposed between the alkaline recovery tank and the baffle.

[0016] In some embodiments, an alkaline level gauge is also included, which is disposed on the alkaline recovery tank;

[0017] An alkaline control valve is provided between the alkaline recovery tank and the alkaline storage tank and is electrically connected to the alkaline level gauge.

[0018] In some embodiments, the alkaline control valve is a solenoid valve.

[0019] In some embodiments, an acid pump is also included, which is disposed between the acid recovery tank and the acid storage tank, and between the acid storage tank and the anolyte tank.

[0020] In some embodiments, an alkaline pump is also included, which is disposed between the alkaline recovery tank and the alkaline storage tank, and between the alkaline storage tank and the baffle.

[0021] In some embodiments, a regulating valve is further included, which is disposed between the anolyte tank and the acid recovery tank, and between the baffle tank and the alkaline recovery tank.

[0022] In summary, this utility model has the following beneficial effects:

[0023] This invention collects the acidic wastewater generated during the acid washing and regeneration of the resin tower into an acidic wastewater recovery tank and transports it to the anolyte tank to replace the high-purity hydrochloric acid originally required for the anolyte tank. Similarly, it collects the alkaline wastewater generated during the alkaline washing and regeneration of the resin tower into an alkaline wastewater recovery tank and transports it to a baffle tank to replace the caustic soda solution originally required for the baffle tank. This allows for the recycling and reuse of both acidic and alkaline wastewater generated during resin tower regeneration, replacing the high-purity hydrochloric acid and caustic soda solution originally used in the production process. This reduces production costs, minimizes environmental pollution, and achieves efficient resource utilization.

[0024] By using acidic level gauges in conjunction with acidic control valves and alkaline level gauges in conjunction with alkaline control valves, precise control of the flow rate of acidic and alkaline wastewater can be achieved. At the same time, the concentration of alkaline wastewater flowing into the baffle tank and acidic wastewater flowing into the anolyte tank can be ensured, thus ensuring a stable supply of acidic and alkaline wastewater. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] In the diagram: 1. Resin tower; 2. Acidic wastewater pipe; 3. Alkaline wastewater pipe; 4. Acidic recovery tank; 5. Anode liquid tank; 6. Dechlorination tower; 7. Alkaline recovery tank; 8. Baffle trough; 9. Acidic storage tank; 10. Acidic level gauge; 11. Acidic control valve; 12. Alkaline storage tank; 13. Alkaline level gauge; 14. Alkaline control valve; 15. Acid pump; 16. Alkaline pump; 17. Regulating valve. Detailed Implementation

[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] refer to Figure 1 A comprehensive utilization system for brine refining wastewater in caustic soda production includes a resin tower 1, an acidic wastewater pipe 2, an alkaline wastewater pipe 3, an acidic recovery tank 4, an anolyte tank 5, a dechlorination tower 6, an alkaline recovery tank 7, and a baffle 8. The resin tower 1 refines the brine, generating acidic and alkaline wastewater during acid-alkali regeneration. The acidic wastewater pipe 2 is connected to the resin tower 1 and transports the acidic wastewater generated during the acid washing regeneration process. The alkaline wastewater pipe 3 is connected to the resin tower 1 and transports the alkaline wastewater generated during the alkaline washing regeneration process. The acidic recovery tank 4 is connected to the acidic wastewater pipe 2 and collects the acidic wastewater, achieving temporary disposal of the acidic wastewater. The system provides a buffer space for subsequent treatment and utilization. The anolyte tank 5 is connected to the acid recovery tank 4, which can receive acidic wastewater and react with the substances in the anolyte tank 5 to replace the high-purity hydrochloric acid originally required, thereby achieving efficient utilization of acidic wastewater. The dechlorination tower 6 is connected to the anolyte tank 5, which can dechlorinate the anolyte flowing out of the anolyte tank 5. The alkaline recovery tank 7 is connected to the alkaline wastewater pipe 3, which can collect alkaline wastewater in the alkaline recovery tank 7. The baffle trough 8 is connected to the alkaline recovery tank 7, which can receive alkaline wastewater in the alkaline recovery tank 7 to replace the original caustic soda solution used to control the amount of excess alkali in brine purification, thereby achieving efficient utilization of alkaline wastewater.

[0029] In some embodiments, an acid storage tank 9 is also included, which is located between the acid recovery tank 4 and the anolyte tank 5. The acid storage tank 9 can store the acidic wastewater flowing out of the acid recovery tank 4 so as to supply acidic wastewater to the anolyte tank 5 more stably.

[0030] In some embodiments, the system also includes an acid level gauge 10 and an acid control valve 11. The acid level gauge 10 is installed on the acid recovery tank 4 and can monitor the level of acidic wastewater in the acid recovery tank 4 in real time. The acid control valve 11 is installed between the acid storage tank 9 and the acid recovery tank 4 and is electrically connected to the acid level gauge 10. It can automatically control the flow rate of acidic wastewater according to the level information fed back by the acid level gauge 10, so as to ensure the stability of the level in the acid recovery tank 4 and the concentration of acidic wastewater in the acid storage tank 9, thereby achieving a stable supply of acidic substances to the anolyte tank 5.

[0031] In some embodiments, an alkaline storage tank 12 is also included, which is located between the alkaline recovery tank 7 and the baffle 8, and can store alkaline wastewater so as to supply alkaline wastewater to the baffle 8 more stably.

[0032] In some embodiments, the system also includes an alkaline level gauge 13 and an alkaline control valve 14. The alkaline level gauge 13 is installed on the alkaline recovery tank 7 and can monitor the level of alkaline wastewater in the alkaline recovery tank 7 in real time. The alkaline control valve 14 is located between the alkaline recovery tank 7 and the alkaline storage tank 12 and is electrically connected to the alkaline level gauge 13. It can automatically control the flow rate of alkaline wastewater according to the level information fed back by the alkaline level gauge 13, so as to ensure the stability of the liquid level in the alkaline recovery tank 7 and the concentration of alkaline wastewater in the alkaline storage tank 12, thereby achieving a stable supply of alkaline substances to the baffle trough 8.

[0033] In some embodiments, both the acid control valve 11 and the alkaline control valve 14 can be solenoid valves, which can realize wireless connection between the acid control valve 11 and the acid level gauge 10, and wireless connection between the alkaline control valve 14 and the alkaline level gauge 13, and have the advantages of fast response speed and high control accuracy.

[0034] In some embodiments, an acid pump 15 is also included. The acid pump 15 is located between the acid recovery tank 4 and the acid storage tank 9, and between the acid storage tank 9 and the anolyte tank 5. It can provide power for the flow of acidic wastewater and ensure that the acidic wastewater can reach the designated location smoothly.

[0035] In some embodiments, an alkaline pump 16 is also included. The alkaline pump 16 is located between the alkaline recovery tank 7 and the alkaline storage tank 12, and between the alkaline storage tank 12 and the baffle 8. It can provide power for transporting alkaline wastewater and ensure that the alkaline wastewater can reach the designated location smoothly.

[0036] In some embodiments, a regulating valve 17 is also included. The regulating valve 17 is located between the anolyte tank 5 and the acid recovery tank 4, and between the baffle tank 8 and the alkaline recovery tank 7. It can control the flow rate of acidic wastewater flowing into the anolyte tank 5 and the flow rate of alkaline wastewater flowing into the baffle tank 8, so as to meet the needs of the anolyte tank 5 for acidic substances and the baffle tank 8 for alkaline substances.

[0037] The specific working principle is as follows:

[0038] Acidic wastewater generated during the acid washing and regeneration process of resin tower 1 is transported to acidic recovery tank 4 via acidic wastewater pipe 2 for collection. Acidic level gauge 10 monitors the level of acidic wastewater in acidic recovery tank 4 in real time and feeds the level information back to acidic control valve 11. When the level in acidic recovery tank 4 reaches the set value, acidic control valve 11 automatically opens. Under the action of acidic pump 15, the acidic wastewater in acidic recovery tank 4 is transported to acidic storage tank 9 for storage. When the level in acidic recovery tank 4 is lower than the set value, acidic control valve 11 closes. The acidic wastewater in acidic storage tank 9 is transported to anolyte tank 5 for chlorine recovery and decomposition of free chlorine, controlling the pH of the anolyte at 1.5–2.5, replacing the previously required high-purity hydrochloric acid, thus completing the recycling of acidic wastewater. After adjusting the pH value in anolyte tank 5, the anolyte enters dechlorination tower 6 for dechlorination treatment before continuing the subsequent production process.

[0039] The alkaline wastewater generated during the alkaline washing and regeneration process of resin tower 1 is transported to the alkaline recovery tank 7 for collection via alkaline wastewater pipe 3. An alkaline level gauge 13 monitors the level of the alkaline wastewater in the alkaline recovery tank 7 in real time and feeds the level information back to the alkaline control valve 14. When the level in the alkaline recovery tank 7 reaches the set value, the alkaline control valve 14 opens, and the alkaline wastewater in the alkaline recovery tank 7 is transported to the alkaline storage tank 12 for storage. When the level in the alkaline recovery tank 7 is lower than the set value, the alkaline control valve 14 closes. The alkaline wastewater in the alkaline storage tank 12 is then transported to the primary brine baffle trough 8 to replace the previously used caustic soda solution, used to control the excess alkali in the brine refining process, and subsequently enters the brine refining process.

[0040] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A comprehensive utilization system for brine refining wastewater in caustic soda production, characterized in that: Including resin tower (1); Acidic wastewater pipe (2), which is connected to the resin tower (1); Alkaline wastewater pipe (3), which is connected to the resin tower (1); An acidic recovery tank (4) is connected to the acidic wastewater pipe (2); Anode liquid tank (5), which is connected to the acid recovery tank (4); A dechlorination tower (6) is connected to the anolyte tank (5); An alkaline recovery tank (7) is connected to the alkaline wastewater pipe (3); A baffle tank (8) is connected to the alkaline recovery tank (7).

2. The comprehensive utilization system for brine refining wastewater in caustic soda production according to claim 1, characterized in that: It also includes an acid storage tank (9), which is located between the acid recovery tank (4) and the anolyte tank (5).

3. The comprehensive utilization system for brine refining wastewater in caustic soda production according to claim 2, characterized in that: It also includes an acid level gauge (10), which is installed on the acid recovery tank (4); An acid control valve (11) is located between the acid storage tank (9) and the acid recovery tank (4) and is electrically connected to the acid level gauge (10).

4. A comprehensive utilization system for brine refining wastewater in caustic soda production according to claim 1, characterized in that: It also includes an alkaline storage tank (12), which is located between the alkaline recovery tank (7) and the baffle (8).

5. A comprehensive utilization system for brine refining wastewater in caustic soda production according to claim 4, characterized in that: It also includes an alkaline level gauge (13), which is installed on the alkaline recovery tank (7); An alkaline control valve (14) is located between the alkaline recovery tank (7) and the alkaline storage tank (12) and is electrically connected to the alkaline level gauge (13).

6. A comprehensive utilization system for brine refining wastewater in caustic soda production according to claim 5, characterized in that: The alkaline control valve (14) is a solenoid valve.

7. A comprehensive utilization system for brine refining wastewater in caustic soda production according to claim 2, characterized in that: It also includes an acid pump (15), which is located between the acid recovery tank (4) and the acid storage tank (9), and between the acid storage tank (9) and the anolyte tank (5).

8. A comprehensive utilization system for brine refining wastewater in caustic soda production according to claim 4, characterized in that: It also includes an alkaline pump (16), which is located between the alkaline recovery tank (7) and the alkaline storage tank (12), and between the alkaline storage tank (12) and the baffle (8).

9. A comprehensive utilization system for brine refining wastewater in caustic soda production according to claim 1, characterized in that: It also includes a regulating valve (17), which is located between the anolyte tank (5) and the acid recovery tank (4), and between the baffle tank (8) and the alkaline recovery tank (7).

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