Automatic sodium hypochlorite adding device for pickling process

Abstract

The utility model provides an automatic sodium hypochlorite adding device for a pickling process, which relates to the technical field of high-purity quartz sand processing and comprises a support plate, a pickling kettle arranged on the right of the support plate, a precision metering pump mounted above the support plate, a liquid storage tank mounted on the upper surface of the support plate, and a first motor mounted on the upper surface of the liquid storage tank. The output end of the first motor penetrates through the liquid storage tank and then is provided with a first stirring shaft, and multiple sets of first stirring blades are installed on the outer surface of the first stirring shaft. According to the utility model, the pH value in the pickling kettle is continuously monitored through the pH online detector, when the pH value is detected to deviate from a preset range, relevant information is immediately sent to the PLC, and the PLC sends an instruction to start the precision metering pump after analyzing and processing, so that the precision metering pump adds a sodium hypochlorite solution into the pickling kettle through the sealed dosing pipeline; therefore, automation and unmanned operation of the dosing process are realized, and various problems caused by manual operation are avoided.

Description

Technical Field

[0001] This utility model relates to the field of high-purity quartz sand processing technology, specifically to an automatic sodium hypochlorite addition device for the pickling process. Background Technology

[0002] In the purification process of high-purity quartz sand (SiO2 purity ≥ 99.99%), acid leaching is the core process for removing metallic impurities (such as iron and manganese oxides) and organic black spot contamination from the surface of the quartz sand. Usually, hydrochloric acid, sulfuric acid, or hydrofluoric acid are used to leach the quartz sand. Subsequently, sodium hypochlorite (NaClO) solution is added. The strong oxidizing property (oxidation-reduction potential 1.49V) of hypochlorous acid (HClO) generated by the reaction of sodium hypochlorite with acid is used to oxidize and decompose the coloring substances (such as carbon-containing organic matter, sulfides, etc.) on the surface of the quartz crystal, thereby improving the whiteness and light transmittance of the quartz sand.

[0003] However, this process has significant safety hazards: the current mainstream process relies on manual addition of sodium hypochlorite solution, which has the following problems: crude reaction control: operators control the dosage based on experience, and cannot accurately maintain the optimal reaction range of pH 2.5-3.5 (in which the proportion of HClO is >85%), causing fluctuations in chlorine generation (measured to be 50-200ppm); high exposure risk: the pickling tank is often an open structure, and operators need to pour the agent at close range (<1m) during dosing, and chlorine directly diffuses to the work surface (according to the test data of a quartz sand company, the peak chlorine concentration in the breathing zone reached 8mg / m³, exceeding the national standard limit by 8 times). Utility Model Content

[0004] The purpose of this invention is to provide an automatic sodium hypochlorite addition device for the pickling process, so as to solve the problems mentioned in the background art and overcome its technical defects.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an automatic sodium hypochlorite addition device for the pickling process, including a support plate, an pickling kettle arranged on the right side of the support plate, a precision metering pump installed above the support plate, a storage tank installed on the upper surface of the support plate, a first motor installed on the upper surface of the storage tank, a first stirring shaft installed after the output end of the first motor passes through the storage tank, multiple sets of first stirring blades are installed on the outer surface of the first stirring shaft, a level gauge is installed on the outer surface of the storage tank, the input end of the precision metering pump is connected to the outer surface of the storage tank, the output end of the precision metering pump is connected to a sealed dosing pipeline, the end of the sealed dosing pipeline away from the precision metering pump is connected to the upper surface of the pickling kettle, and a backflow valve is installed on the upper surface of the sealed dosing pipeline.

[0006] As a further embodiment of this utility model: a second motor is installed on the upper surface of the pickling tank, and a second stirring shaft is installed after the output end of the second motor passes through the pickling tank. Multiple sets of second stirring blades are installed on the outer surface of the second stirring shaft, and an online pH meter is installed on the inner wall of the pickling tank.

[0007] As a further embodiment of this utility model: the upper surface of the pickling kettle is connected to a feed hopper, and the bottom surface of the pickling kettle is connected to a discharge hopper.

[0008] As a further embodiment of this utility model: an alkaline spray tower is provided on the right side of the support plate, and a fiberglass centrifugal fan is installed on the right side of the support plate.

[0009] As a further embodiment of this utility model: the input end of the fiberglass centrifugal fan is connected to an exhaust gas pipe, the end of the exhaust gas pipe away from the fiberglass centrifugal fan is connected to an exhaust gas collection hood, and the output end of the fiberglass centrifugal fan is connected to the outer surface of the alkaline spray tower.

[0010] As a further improvement of this utility model: a base plate is installed on the bottom surface of the alkaline spray tower, and an exhaust pipe is connected to the upper surface of the alkaline spray tower.

[0011] As a further improvement of this utility model: the bottom surface of the support plate is welded with a plurality of first support legs, and the bottom surface of the pickling kettle is welded with a plurality of second support legs.

[0012] As a further embodiment of this utility model: a protective cabinet is provided on the front of the support plate, a cabinet door is hinged to the front of the protective cabinet, and a PLC controller is installed inside the protective cabinet.

[0013] Compared with the prior art, the beneficial effects of this utility model include:

[0014] This invention continuously monitors the pH level in the pickling tank using an online pH meter. When the pH value deviates from the preset range, it immediately sends the relevant information to the PLC controller. After analysis and processing, the PLC controller issues a command to start the precision metering pump, which adds sodium hypochlorite solution to the pickling tank through a sealed dosing pipeline. This automates and unmanned operation of the dosing process, avoiding various problems caused by manual operation. The pH controller reduces chlorine production at the source. Meanwhile, the waste gas treatment unit adopts a combination structure of fiberglass centrifugal fan, waste gas pipe, and waste gas collection hood to achieve efficient capture of waste gas, thereby reducing environmental pollution and operational risks. The captured waste gas is sent to the alkaline spray tower, where a multi-layer spray design ensures full gas-liquid contact and achieves ideal neutralization, significantly reducing chlorine treatment costs and continuously meeting environmental monitoring requirements. Attached Figure Description

[0015] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0016] Figure 1 The schematic diagram shows a three-dimensional structural diagram of an automatic sodium hypochlorite addition device for a pickling process according to one embodiment of the present invention;

[0017] Figure 2 The schematic diagram shows a rear view of an automatic sodium hypochlorite addition device for a pickling process according to one embodiment of the present invention.

[0018] Figure 3 The schematic diagram shows a cross-sectional view of an automatic sodium hypochlorite addition device for a pickling process according to one embodiment of the present invention.

[0019] Figure 4 The schematic diagram shows an orthographic view of an automatic sodium hypochlorite addition device for a pickling process according to one embodiment of the present invention.

[0020] Figure 5 This schematically illustrates an automatic sodium hypochlorite addition device for a pickling process according to one embodiment of the present invention. Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0021] In the picture:

[0022] 1. Support plate; 2. Storage tank; 3. First motor; 4. Counterflow valve; 5. Waste gas pipe; 6. Exhaust pipe; 7. Alkali spray tower; 8. Base plate; 9. Waste gas collection hood; 10. Discharge hopper; 11. Cabinet door; 12. Protective cabinet; 13. First support leg; 14. Pickling kettle; 15. Level gauge; 16. First stirring shaft; 17. Second support leg; 18. Second motor; 19. Second stirring shaft; 20. PLC controller; 21. Fiberglass centrifugal fan; 22. Sealed dosing pipeline; 23. First stirring blade; 24. Second stirring blade; 25. Precision metering pump; 26. Feed hopper; 27. Online pH meter. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0024] An embodiment of the present invention is shown in conjunction with the accompanying drawings.

[0025] The pickling process uses an automatic sodium hypochlorite addition device, including a support plate 1 to support the storage tank 2. An pickling kettle 14 is located to the right of the support plate 1, used for the pickling of quartz sand, and is the core part of the entire device. A precision metering pump 25 is installed above the support plate 1, precisely controlling the amount of sodium hypochlorite solution added according to the instructions of the PLC controller 20. The storage tank 2 is installed on the upper surface of the support plate 1 to store the sodium hypochlorite solution, providing a stable supply of reagents for the pickling process. A first motor 3 is installed on the upper surface of the storage tank 2, driving a first stirring shaft 16 and a first stirring blade 23 to stir the sodium hypochlorite solution in the storage tank 2, preventing stratification and crystallization. The output end of the first motor 3 passes through the storage tank 2 and is connected to the first stirring shaft 16. Multiple sets of first stirring blades 23 are installed on the outer surface of the first stirring shaft 16. A level gauge 15 is installed on the outer surface of the storage tank 2. The input end of the precision metering pump 25 is connected to the outer surface of the storage tank 2. The output end of the precision metering pump 25 is connected to a sealed dosing pipe 22, which is used to transport sodium hypochlorite solution from the storage tank 2 to the pickling tank 14 to ensure the sealing and safety of the dosing process. The end of the sealed dosing pipe 22 away from the precision metering pump 25 is connected to the upper surface of the pickling tank 14. A backflow valve 4 is installed on the upper surface of the sealed dosing pipe 22 to prevent the sodium hypochlorite solution from flowing back.

[0026] In this embodiment, a second motor 18 is installed on the upper surface of the pickling tank 14 to drive a second stirring shaft 19 and a second stirring blade 24 for stirring the quartz sand and acid in the pickling tank 14. The output end of the second motor 18 passes through the pickling tank 14 and is connected to the second stirring shaft 19. Multiple sets of second stirring blades 24 are installed on the outer surface of the second stirring shaft 19. A pH online detector 27 is installed on the inner wall of the pickling tank 14 to monitor the pH in the pickling tank 14 in real time and send signals to the PLC controller 20.

[0027] In this embodiment, the upper surface of the pickling tank 14 is connected to a feed hopper 26 for feeding quartz sand into the pickling tank 14, and the bottom surface of the pickling tank 14 is connected to a discharge hopper 10 for discharging the treated quartz sand from the pickling tank 14 into subsequent processing steps.

[0028] In this embodiment, an alkaline spray tower 7 is provided on the right side of the support plate 1 to treat the chlorine gas introduced by the exhaust pipe 5. Harmful substances in the gas are removed by spraying alkaline solution. A fiberglass centrifugal fan 21 is installed on the right side of the support plate 1 to generate negative pressure and draw the chlorine gas into the alkaline spray tower 7 for treatment.

[0029] In this embodiment, the input end of the fiberglass centrifugal fan 21 is connected to the exhaust gas pipe 5, and the end of the exhaust gas pipe 5 away from the fiberglass centrifugal fan 21 is connected to the exhaust gas collection hood 9, which is located above the pickling tank 14 and is used to collect any chlorine gas that may be generated and prevent it from spreading to the working surface. The output end of the fiberglass centrifugal fan 21 is connected to the outer surface of the alkaline spray tower 7.

[0030] In this embodiment, a base plate 8 is installed on the bottom surface of the alkaline spray tower 7 to provide support for the alkaline spray tower 7, and an exhaust pipe 6 is connected to the upper surface of the alkaline spray tower 7 to discharge the gas purified by the alkaline spray tower 7, ensuring that the exhaust gas emissions meet environmental protection standards.

[0031] In this embodiment, a plurality of first support legs 13 are welded to the bottom surface of the support plate 1 to provide additional support for the liquid storage tank 2 and the support plate 1, thereby enhancing the stability of the device. A plurality of second support legs 17 are welded to the bottom surface of the pickling tank 14 to provide support for the pickling tank 14 and ensure the stability of the device.

[0032] In this embodiment, a protective cabinet 12 is provided on the front of the support plate 1 to protect the PLC controller 20 and prevent the external environment from affecting the device. The front of the protective cabinet 12 is hinged with a cabinet door 11. The PLC controller 20 and the central control unit are installed inside the protective cabinet 12 to receive and process signals from the pH online detector and control the operation of the precision metering pump 25 and the motor.

[0033] Working principle: During use, the operator first checks the sodium hypochlorite level in the storage tank 2 using the level gauge 15 to ensure sufficient levels. Once confirmed, the operator starts the first motor 3 via the PLC controller 20, driving the first stirring shaft 16 and the first stirring blade 23 to agitate the sodium hypochlorite solution in the storage tank 2. When the sodium hypochlorite solution is left to stand for a long time, it is prone to stratification due to density differences. The stirring of the blades ensures a stable concentration. If the sodium hypochlorite solution contains a small amount of crystals, stirring accelerates their dissolution, preventing blockage of the dosing pipe. After completing the above operations, the solution is then... The feed hopper 26 pours quartz sand into the pickling tank 14. Then, the cabinet door 11 is opened, and the protective cabinet 12 is activated. The second motor 18 is started via the PLC controller 20, driving the second stirring shaft 19 and the second stirring blades 24 to rotate. Simultaneously, the online pH meter 27 is activated to monitor the pH level inside the pickling tank 14. When the online pH meter 27 detects a low pH or excessively high acid concentration, it sends a signal to the PLC controller 20. Upon receiving the signal, the PLC controller 20 starts the precision metering pump 25, adding sodium hypochlorite into the pickling tank 14 through the sealed dosing pipe 22. Until the metering value set by the PLC controller 20 for the precision metering pump 25 is reached to maintain stable dosing, when the pH online detector 27 transmits a signal indicating a high pH to the PLC controller 20, the PLC controller 20 will immediately take measures to control the precision metering pump 25 to reduce the amount of sodium hypochlorite added, thereby relatively increasing the acid concentration and promoting the reaction between sodium hypochlorite and hydrogen ions, thus gradually lowering the pH back to a reasonable range. The key here is that when the pH is too high, acid should not be added blindly to prevent side reactions that generate chlorine gas. Instead, the amount of sodium hypochlorite added should be reduced to fully utilize... The residual acid in the reactor is used to adjust the pH and ensure the safety of the entire process. While the second motor 18 drives the second stirring shaft 19 and the second stirring blade 24 to stir in the pickling reactor 14, chlorine gas may be generated. At this time, the fiberglass centrifugal fan 21 is started by the PLC controller 20, and the generated chlorine gas is drawn into the alkaline spray tower 7 through the waste gas pipe 5 and the waste gas collection hood 9. The alkaline spray tower 7 purifies the waste gas. After the waste gas is purified to meet the emission conditions, it is discharged through the exhaust pipe 6. After the stirring is completed, the pickled quartz sand can flow out through the discharge hopper 10 and enter the subsequent processing steps.

[0034] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. An automatic sodium hypochlorite addition device for the pickling process, characterized in that, The system includes a support plate (1), a pickling tank (14) is provided on the right side of the support plate (1), a precision metering pump (25) is installed above the support plate (1), a storage tank (2) is installed on the upper surface of the support plate (1), a first motor (3) is installed on the upper surface of the storage tank (2), a first stirring shaft (16) is installed after the output end of the first motor (3) passes through the storage tank (2), a plurality of first stirring blades (23) are installed on the outer surface of the first stirring shaft (16), a level gauge (15) is installed on the outer surface of the storage tank (2), the input end of the precision metering pump (25) is connected to the outer surface of the storage tank (2), the output end of the precision metering pump (25) is connected to a sealed dosing pipe (22), the end of the sealed dosing pipe (22) away from the precision metering pump (25) is connected to the upper surface of the pickling tank (14), and a backflow valve (4) is installed on the upper surface of the sealed dosing pipe (22).

2. The automatic sodium hypochlorite addition device for the pickling process according to claim 1, characterized in that, A second motor (18) is installed on the upper surface of the pickling tank (14). The output end of the second motor (18) passes through the pickling tank (14) and is connected to a second stirring shaft (19). Multiple sets of second stirring blades (24) are installed on the outer surface of the second stirring shaft (19). A pH online detector (27) is installed on the inner wall of the pickling tank (14).

3. The automatic sodium hypochlorite addition device for the pickling process according to claim 2, characterized in that, The upper surface of the pickling tank (14) is connected to the feed hopper (26), and the bottom surface of the pickling tank (14) is connected to the discharge hopper (10).

4. The automatic sodium hypochlorite addition device for the pickling process according to claim 3, characterized in that, An alkaline spray tower (7) is provided on the right side of the support plate (1), and a fiberglass centrifugal fan (21) is installed on the right side of the support plate (1).

5. The automatic sodium hypochlorite addition device for the pickling process according to claim 4, characterized in that, The input end of the fiberglass centrifugal fan (21) is connected to the exhaust gas pipe (5), and the end of the exhaust gas pipe (5) away from the fiberglass centrifugal fan (21) is connected to the exhaust gas collection hood (9). The output end of the fiberglass centrifugal fan (21) is connected to the outer surface of the alkaline spray tower (7).

6. The automatic sodium hypochlorite addition device for the pickling process according to claim 5, characterized in that, The bottom surface of the alkaline spray tower (7) is equipped with a bottom plate (8), and the upper surface of the alkaline spray tower (7) is connected to an exhaust pipe (6).

7. The automatic sodium hypochlorite addition device for the pickling process according to claim 6, characterized in that, The bottom surface of the support plate (1) is welded with a plurality of first support legs (13), and the bottom surface of the pickling kettle (14) is welded with a plurality of second support legs (17).

8. The automatic sodium hypochlorite addition device for the pickling process according to claim 7, characterized in that, A protective cabinet (12) is provided on the front of the support plate (1), and a cabinet door (11) is hinged to the front of the protective cabinet (12). A PLC controller (20) is installed inside the protective cabinet (12).

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