Recycling and separating device for reducing silicon dioxide in chlor-alkali water

Abstract

The utility model belongs to the technical field of wastewater recycling, and particularly relates to a recycling and separating device for reducing silicon dioxide in chlor-alkali water. The recovery and separation device for reducing silicon dioxide in chlor-alkali water comprises a public engineering wastewater treatment and recovery pool, a salty mud washing pool, a salty mud filter press, a wastewater treatment and recovery pool, a saline water distribution tank and an electrolysis system saline water discharge tank, and the public engineering wastewater treatment and recovery pool is connected with a public engineering resin tower regeneration water pipe and a multi-medium backwashing water pipe. The public engineering wastewater treatment and recovery pool is connected with the salty mud washing pool, the salty mud filter press, the wastewater treatment and recovery pool and the saline water distribution tank, the electrolysis system saline water discharge tank is connected with the saline water distribution tank, and the electrolysis system saline water discharge tank is connected with an electrolysis tank sampling saline water pipe, an electrolysis tank discharge saline water pipe and an electrolysis system resin tower regeneration water pipe. According to the recycling device for reducing the silicon dioxide in the chlor-alkali water, the service life of the ionic membrane is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater recycling and reuse, and specifically relates to a recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution. Background Art

[0002] In the chlor-alkali industry, secondary brine is the main raw material for chlor-alkali production. The quality of brine directly affects the operation status of the electrolytic cell and the service life of the ion membrane. Therefore, how to optimize the quality of brine and improve the quality of brine is the constant pursuit of the chlor-alkali industry. The chlor-alkali industry mainly uses ion membrane electrolyzers, and the main products are caustic soda, liquid chlorine, hydrogen, etc. The anode chamber and cathode chamber of the electrolytic cell are separated by an ion membrane. Refined brine enters the anode chamber, and pure water is added to the cathode chamber.

[0003] SiO2 in salt water itself has no effect on the ion membrane, but when it exists together with other elements in the salt water, such as aluminum, calcium, magnesium, and strontium, it will affect the performance of the ion membrane and increase the cell voltage. SiO2 dissolves in salt water in an ionic state under alkaline conditions, and cannot be removed by HVM membrane filters and public engineering resin tower regeneration water pipes; it generates non-ionic silicate in acidic salt water, which is affected by Na + The influence of movement enters the membrane. If the brine contains metal ions such as aluminum, calcium, magnesium, and strontium, then silicic acid and silicate will form complex precipitation with impurity ions such as aluminum, calcium, strontium, and magnesium, which will increase the voltage of the electrolytic cell. In chlor-alkali production, the water cycle is generally a closed-loop cycle, and the company implements "zero discharge" of wastewater, so the requirements for the recycling and reuse of various water in the chlor-alkali process are more stringent.

[0004] At present, multiple water pipes enter the water distribution tank of brine at the same time, and the distributed water is directly used for salting to form saturated brine, which enters the electrolytic cell after a series of refining treatments. If the SiO2 index in the distributed water is high, it will inevitably lead to a high SiO2 index in the brine entering the tank, reducing the life of the electrolytic cell ion membrane. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the above-mentioned defects of the prior art and provide a device for recycling silicon dioxide in chlor-alkali water distribution. By controlling the recycling paths of various types of water in the system, the SiO2 index in the brine water distribution tank is greatly reduced, the electrolytic "blood" is purified, and the service life of the ion membrane of the electrolytic cell is increased.

[0006] The utility model discloses a recycling device for reducing silicon dioxide in chlor-alkali water distribution, comprising a public works wastewater treatment recovery pool, a salt mud washing pool, a salt mud filter press, a wastewater treatment recovery pool, a brine water distribution tank, and an electrolysis system brine discharge tank, wherein the public works wastewater treatment recovery pool is connected with a public works resin tower regeneration water pipe and a multi-media backwashing water pipe, the public works wastewater treatment recovery pool is connected with a salt mud washing pool, the salt mud washing pool is connected with a salt mud filter press, the salt mud filter press is connected with a wastewater treatment recovery pool, the wastewater treatment recovery pool is connected with a brine water distribution tank, the electrolysis system brine discharge tank is connected with a brine water distribution tank, and the electrolysis system brine discharge tank is connected with an electrolytic cell sampling brine pipe, an electrolytic cell discharge brine pipe, and an electrolysis system resin tower regeneration water pipe.

[0007] Preferably, a pump a is provided between the utility wastewater treatment recovery tank and the salt mud washing tank.

[0008] Preferably, a pure water pipe is provided on the salt mud washing tank.

[0009] Preferably, a salt mud pump is provided on the pipeline from the salt mud washing tank to the salt mud filter press.

[0010] Preferably, the pipeline from the salt mud filter press to the salt mud washing tank is a salt mud recovery pipe.

[0011] Preferably, a pump b is provided between the wastewater treatment recovery tank and the brine distribution tank.

[0012] Preferably, a pump c is provided between the brine discharge tank and the brine distribution tank of the electrolysis system.

[0013] The utility model discloses a recycling device for reducing silicon dioxide in chlor-alkali water distribution. When working, water from a public engineering resin tower regeneration water pipe and a multi-media backwashing water pipe enters a public engineering wastewater treatment recovery pool, enters a salt mud washing pool through a pump a, and the mixed liquid after washing is pumped into a salt mud filter press through a salt mud pump. After filtration, the recovered part is returned to the salt mud washing pool through a salt mud recovery pipe for further washing. A pure water pipe is provided on the salt mud washing pool for water washing. The treated brine enters a wastewater treatment recovery pool, enters a brine distribution tank through a pump b for standby use, and at the same time, water passing through an electrolytic cell sampling brine pipe, an electrolytic cell discharge brine pipe, and an electrolytic system resin tower regeneration water pipe is collected into an electrolytic system brine discharge tank, and enters a brine distribution tank through a pump c for standby use.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model discloses a recovery and separation device for reducing silica in chlor-alkali water distribution, which classifies and processes various water sources entering the brine water distribution tank, separates and processes wastewater from public engineering resin tower regeneration and multi-media backwashing and wastewater from the electrolytic brine system, thereby reducing the silica index in the brine water distribution tank, further reducing the silica index in the secondary brine, and extending the service life of the ion membrane of the electrolytic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a recovery and separation device for reducing silicon dioxide in chlor-alkali water according to the utility model.

[0017] Figure 2 Schematic diagram of the existing chlor-alkali water recycling device A.

[0018] Figure 3 Schematic diagram of the existing chlor-alkali water recycling device B.

[0019] In the figure: 1. Regeneration water pipe for public works resin tower; 2. Multi-media backwash water pipe; 3. Public works wastewater treatment recovery tank; 4. Pump a; 5. Salt mud washing tank; 6. Pure water pipe; 7. Salt mud filter press; 8. Salt mud pump; 9. Wastewater treatment recovery tank; 10. Pump b; 11. Pump c; 12. Brine distribution tank; 13. Electrolysis system brine discharge tank; 14. Salt mud recovery pipe; 15. Electrolytic cell sampling brine pipe; 16. Electrolytic cell discharge brine pipe; 17. Electrolysis system resin tower regeneration water pipe; 18. Steam condensation water pipe; 19. Pump cooling water pipe; 20. Cleaning water pipe. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with specific embodiments.

[0021] like Figure 1 As shown, the recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution includes: a public works wastewater treatment recovery tank 3, a salt mud washing tank 5, a salt mud filter press 7, a wastewater treatment recovery tank 9, a brine water distribution tank 12, and an electrolysis system brine discharge tank 13. The public works wastewater treatment recovery tank 3 is connected to a public works resin tower regeneration water pipe 1 and a multi-media backwashing water pipe 2. The public works wastewater treatment recovery tank 3 is connected to the salt mud washing tank 5, the salt mud washing tank 5 is connected to the salt mud filter press 7, the salt mud filter press 7 is connected to the wastewater treatment recovery tank 9, the wastewater treatment recovery tank 9 is connected to the brine water distribution tank 12, the electrolysis system brine discharge tank 13 is connected to the brine water distribution tank 12, and the electrolysis system brine discharge tank 13 is connected to an electrolytic cell sampling brine pipe 15, an electrolytic cell discharge brine pipe 16, and an electrolysis system resin tower regeneration water pipe 17.

[0022] A pump a4 is provided between the utility wastewater treatment recovery tank 3 and the salt mud washing tank 5 .

[0023] A pure water pipe 6 is provided on the salt mud washing tank 5 .

[0024] A salt mud pump 8 is provided on the pipeline from the salt mud washing tank 5 to the salt mud filter press 7 .

[0025] The pipeline from the salt mud filter press 7 to the salt mud washing tank 5 is a salt mud recovery pipe 14 .

[0026] A pump b10 is provided between the wastewater treatment recovery tank 9 and the brine distribution tank 12 .

[0027] A pump c11 is provided between the electrolysis system brine discharge tank 13 and the brine distribution tank 12 .

[0028] With the improved water source process, the three water sources of the steam condensation water pipe 18, the pump cooling water pipe 19 and the cleaning water pipe 20 no longer enter the salt water distribution system, but directly enter the circulating water pool for evaporation treatment.

[0029] The recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution described in the utility model, when working, the water of the public engineering resin tower regeneration water pipe 1 and the multi-media backwashing water pipe 2 enters the public engineering wastewater treatment recovery pool 3, enters the salt mud washing pool 5 through the pump a4, the mixed liquid after washing is pumped into the salt mud filter press 7 through the salt mud pump 8, after filtration, the recovered part is returned to the salt mud washing pool 5 through the salt mud recovery pipe 14 for further washing, the salt mud washing pool 5 is provided with a pure water pipe 6 for water washing, the treated brine enters the wastewater treatment recovery pool 9, enters the brine water distribution tank 12 for standby use through the pump b10, and at the same time, the water passing through the electrolytic cell sampling brine pipe 15, the electrolytic cell discharge brine pipe 16, and the electrolytic system resin tower regeneration water pipe 17 is merged into the electrolytic system brine discharge tank 13, and enters the brine water distribution tank 12 for standby use through the pump c11.

[0030] The original chlor-alkali water recycling device A, such as Figure 2 As shown, the water source of the public engineering resin tower regeneration water pipe 1 and the multi-media backwash water pipe 2 directly enters the public engineering wastewater treatment recovery pool 3, and enters the brine distribution tank 12 through the pump a4 for standby use.

[0031] The original chlor-alkali water recycling device B, such as Figure 3 As shown, six water sources including the electrolytic cell sampling brine pipe 15, the electrolytic cell discharge brine pipe 16, the electrolytic system resin tower regeneration water pipe 17, the steam condensation water pipe 18, the pump cooling water pipe 19, and the cleaning water pipe 20 are converged into the electrolytic system brine discharge tank 13 and enter the brine distribution tank 12 through the pump c11 for standby use.

[0032] The utility model discloses a device for recycling and utilizing silicon dioxide in reducing chlor-alkali water distribution, which checks various water sources entering the chemical salt water distribution system, finds out the silicon dioxide impurity content in the water sources, classifies the water sources for use, controls the silicon dioxide brought into the water system from the source, achieves the reduction of silicon dioxide in the secondary brine system, and obtains good results.

[0033] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and any equivalent changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention shall fall within the scope of the patent coverage of the present invention.

Claims

1. A recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution, characterized in that: The utility model comprises a wastewater treatment recovery pool (3), a salt mud washing pool (5), a salt mud filter press (7), a wastewater treatment recovery pool (9), a salt water distribution tank (12), and an electrolysis system salt water discharge tank (13). The wastewater treatment recovery pool (3) is connected to a public utility resin tower regeneration water pipe (1) and a multi-media backwashing water pipe (2). The wastewater treatment recovery pool (3) is connected to the salt mud washing pool (5). The salt mud washing pool (5) is connected to the salt mud filter press (7). The salt mud filter press (7) is connected to the wastewater treatment recovery pool (9). The wastewater treatment recovery pool (9) is connected to the salt water distribution tank (12). The electrolysis system salt water discharge tank (13) is connected to the salt water distribution tank (12). The electrolysis system salt water discharge tank (13) is connected to an electrolytic cell sampling salt water pipe (15), an electrolytic cell discharge salt water pipe (16), and an electrolysis system resin tower regeneration water pipe (17).

2. The recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution according to claim 1, characterized in that: A pump a (4) is provided between the public works wastewater treatment recovery tank (3) and the salt mud washing tank (5).

3. The recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution according to claim 1, characterized in that: A pure water pipe (6) is provided on the salt mud washing tank (5).

4. The recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution according to claim 1, characterized in that: A salt mud pump (8) is provided on the pipeline from the salt mud washing tank (5) to the salt mud filter press (7).

5. The recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution according to claim 1, characterized in that: The pipeline from the salt mud filter press (7) to the salt mud washing tank (5) is a salt mud recovery pipe (14).

6. The recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution according to claim 1, characterized in that: A pump b (10) is provided between the wastewater treatment recovery tank (9) and the salt water distribution tank (12).

7. The recovery and separation device for reducing silicon dioxide in chlor-alkali water distribution according to claim 1, characterized in that: A pump c (11) is provided between the electrolysis system brine discharge tank (13) and the brine distribution tank (12).

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