Sodium sulfate recovery system for printing roller processing wastewater

Abstract

The utility model provides a printing roller processing wastewater sodium sulfate salt recovery system which comprises a brine tank, a screen is obliquely arranged above an opening of the brine tank, the brine tank is connected with a cooling device, a bottom outlet of the brine tank is connected to an inlet of a water pump, an outlet of the water pump is connected to a drainage pipe, and the drainage pipe is connected with a water pump. An outlet of the water drainage pipe is formed above the screen, and a salt drainage box is arranged below the lower side of the screen. According to the utility model, the problem that sodium sulfate crystals are attached to the salt precipitation box and are difficult to remove is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plate roller processing wastewater treatment, especially relates to a kind of plate roller processing wastewater sodium sulfate salt recovery system. BACKGROUND

[0002] In the making process of gravure roller, nickel is plated on roller body to improve the bonding force of roller cylinder and copper layer, then copper is plated on roller body and pattern is engraved on roller body surface, finally chromium is plated on roller cylinder to improve the wear resistance of plate roller. After plating nickel and chromium, plate roller needs to be cleaned to remove electroplating solution and other impurities adhered to roller cylinder, so a large amount of wastewater containing nickel and chromium ions is generated, which needs to be treated with acid and alkali chemicals to meet the discharge standard. Since the treated wastewater mainly contains sodium sulfate, and the amount of wastewater in the factory is very large, direct discharge will result in a large waste of water resources. Therefore, the wastewater is collected into feed water tank, then sequentially passes through heater, evaporation tank and circulating pump for circulating heating, finally the high-temperature steam in evaporation tank is cooled by heat exchanger, clean condensed water formed is collected for reuse, and sodium sulfate saturated solution is discharged into salt precipitation tank and cooled by cooling machine to precipitate sodium sulfate crystals which are manually scooped out. However, the crystallization of sodium sulfate adheres to the side wall and bottom of salt precipitation tank, and the crystallization becomes hard when reaching a certain thickness, so it is difficult to scoop out, affecting work efficiency. Therefore, a new plate roller processing wastewater sodium sulfate salt recovery system needs to be invented. SUMMARY

[0003] The utility model aims at providing a kind of plate roller processing wastewater sodium sulfate salt recovery system, solve the crystallization of sodium sulfate adheres to the salt precipitation tank, it is difficult to remove the problem.

[0004] The technical scheme adopted by the utility model to solve its technical problems is:

[0005] A kind of plate roller processing wastewater sodium sulfate salt recovery system, including salt water tank, the opening of the salt water tank is inclined and is provided with screen, the salt water tank is connected with cooling device, the bottom outlet of the salt water tank is connected to the inlet of water pump, the outlet of the water pump is connected to drain pipe, the outlet of the drain pipe is arranged above the screen, the lower side below the screen of the lower side is provided with salt discharge tank.

[0006] Preferably, in combination with the above-mentioned scheme, the system further includes a fixed support, and the salt water tank and the screen are connected to the fixed support.

[0007] Preferably, in combination with the above-mentioned scheme, the screen is a vibrating screen.

[0008] Preferably, in combination with the above-mentioned scheme, the salt water tank has a funnel structure.

[0009] Preferably, in conjunction with the above scheme, the cooling device includes a cooling ring pipe disposed in the brine tank, and the cooling ring pipe is connected to the cooling machine.

[0010] Preferably, in conjunction with the above scheme, a salt drainage trough is provided on one side of the salt drainage box.

[0011] Preferably, in conjunction with the above scheme, a salt storage tank is provided below the outlet of the salt discharge trough.

[0012] The beneficial effects of this utility model are as follows: The system provided by this utility model can cool and precipitate the sodium sulfate saturated solution after it has been treated by the pre-roller processing wastewater treatment system. The solid salt in the mixed brine can be shaken off through the screen into the salt discharge box, which can effectively solve the problem that sodium sulfate crystals adhere to the salt discharge box and are difficult to remove.

[0013] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a diagram of a sodium sulfate recovery system for wastewater from printing roller processing according to this utility model. Detailed Implementation

[0015] like Figure 1 The system for recovering sodium sulfate from wastewater from printing roller processing is shown. It includes a brine tank 2, with a screen 7 inclined above the opening of the brine tank 2. The screen can be 200-300 mesh. The brine tank 2 is connected to a cooling device. The bottom outlet of the brine tank 2 is connected to the inlet of a water pump 5. The outlet of the water pump 5 is connected to a drain pipe 6. The outlet of the drain pipe 6 is located above the screen 7. A salt discharge box 8 is located below the lower side of the screen 7.

[0016] To facilitate the assembly of the brine tank 2 and the screen 7, the system also includes a fixed bracket 1, on which both the brine tank 2 and the screen 7 are connected.

[0017] To ensure that the precipitated sodium sulfate falls more effectively into the salt discharge tank 8 through vibration and to prevent sodium sulfate from clogging the screen 7, the screen 7 is a vibrating screen. This vibrating screen can be a commercially available screen product, and the vibration is achieved through a vibration motor installed on both sides of the screen and a spring structure.

[0018] To facilitate the discharge of the sodium sulfate mixed aqueous solution from the brine tank 2, the brine tank 2 is a funnel structure.

[0019] In order to cool the sodium sulfate solution in the salt water tank 2, so that the solid sodium sulfate can be gradually precipitated, the cooling device comprises a cooling ring pipe 3 arranged in the salt water tank 2, and the cooling ring pipe 3 is connected to a cooling machine 4, which can adopt the TZA-3AC cooling water machine provided by Suzhou Tianniao Technology Co., Ltd.

[0020] In order to shovel out the solid sodium sulfate in the salt discharge tank 8 by artificial, one side of the salt discharge tank 8 is provided with a salt discharge groove 9.

[0021] In order to facilitate the recovery and storage of solid sodium sulfate, a salt storage tank 10 is arranged below the outlet of the salt discharge groove 9.

[0022] The working principle of the system of the utility model:

[0023] The system is arranged after the existing plate roller processing wastewater treatment system, and the hot sodium sulfate saturated solution obtained after the pre-treatment system is discharged into the salt water tank 2 at one time, the hot salt water is cooled by the cooling machine 4 and the cooling ring pipe 3 of the cooling device, the solid sodium sulfate is gradually precipitated, the mixed salt water containing solid and liquid sodium sulfate is pumped out from the bottom of the salt water tank 2, and is discharged onto the screen 7, and the solid sodium sulfate is shaken and dropped into the salt discharge tank 8, and the salt water falls back into the salt water tank 2. When the salt discharge tank 8 collects a certain amount of solid sodium sulfate, it can be manually scooped into the salt storage tank 10. After a certain amount of hot sodium sulfate saturated solution obtained after the pre-treatment system is stored, it is discharged into the system of the utility model again for treatment.

[0024] In the description of the utility model, it should be understood that the terms such as 'up', 'down', 'front', 'back', 'left', 'right', 'bottom', 'inner', 'outer', 'one end', 'one side', 'two ends', 'two sides' and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0025] The plate roller processing wastewater sodium sulfate salt recovery system of the utility model is described above in conjunction with the drawings, and obviously, the specific implementation of the utility model is not limited by the above-mentioned mode, as long as various improvements are made by adopting the method concept and technical scheme of the utility model, or direct application in other occasions without improvement, all fall within the protection scope of the utility model.

Claims

1. A system for recovering sodium sulfate salt from plate roll processing wastewater, characterized by, The system comprises a brine tank (2), a screen (7) is arranged above the opening of the brine tank (2), the brine tank (2) is connected with a cooling device, the bottom outlet of the brine tank (2) is connected to the inlet of a water pump (5), the outlet of the water pump (5) is connected to a drain pipe (6), the outlet of the drain pipe (6) is arranged above the screen (7), and a salt discharge tank (8) is arranged below the lower side of the screen (7).

2. The plate roll processing wastewater sodium sulfate salt recovery system according to claim 1, characterized by, The system further comprises a fixed support (1), and the brine tank (2) and the screen (7) are connected to the fixed support (1).

3. The plate roll processing wastewater sodium sulfate salt recovery system of claim 1, wherein, The screen (7) is a vibrating screen.

4. The plate roll processing wastewater sodium sulfate salt recovery system of claim 1, wherein, The brine tank (2) has a funnel structure.

5. The plate roll processing wastewater sodium sulfate salt recovery system of claim 1, wherein, The cooling device comprises a cooling ring pipe (3) arranged in the brine tank (2), and the cooling ring pipe (3) is connected to a cooling machine (4).

6. The plate roll processing wastewater sodium sulfate salt recovery system of claim 1, wherein, One side of the salt discharge tank (8) is provided with a salt discharge groove (9).

7. The plate roll processing wastewater sodium sulfate salt recovery system of claim 6, wherein, The outlet of the salt discharge groove (9) is provided with a salt storage tank (10).

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