Dilute sulfuric acid preparation system

Abstract

The utility model discloses a dilute sulfuric acid preparation system, including concentrated sulfuric acid groove, concentrated sulfuric acid high position dosing groove, acid mixing groove, water inlet pipe, dilute sulfuric acid groove, delivery pipe, valve and delivery pump, concentrated sulfuric acid groove, concentrated sulfuric acid high position dosing groove, acid mixing groove and dilute sulfuric acid groove are connected in proper order through infusion pipe, be equipped with water inlet valve on water inlet pipe, and one end is inserted into acid mixing groove, acid mixing groove is equipped with agitator, valve is installed on delivery pipe, delivery pump includes concentrated sulfuric acid pump and dilute sulfuric acid pump, concentrated sulfuric acid pump is installed on the delivery pipe of connecting concentrated sulfuric acid groove and concentrated sulfuric acid high position dosing groove, dilute sulfuric acid pump is installed on the delivery pipe of connecting acid mixing groove and dilute sulfuric acid groove, the utility model discloses through concentrated sulfuric acid groove, concentrated sulfuric acid pump and concentrated sulfuric acid high position dosing groove cooperation control the dosage of concentrated sulfuric acid, water inlet valve controls the water intake, and agitator makes concentrated sulfuric acid and water fully mix, and the concentration of dilute sulfuric acid is ensured uniform, and the whole automatic acid mixing, effectively avoid human factor interference, and the overall production efficiency and safety are high.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic refining production technology, specifically to a dilute sulfuric acid preparation system. Background Technology

[0002] In the electrolytic refining of copper, copper is typically used as the conductive material for conductive plates and cathode plates due to its superior electrical conductivity. However, due to limitations in production technology, copper materials such as cathode plates, anode plates, and conductive plates are exposed to harsh conditions including high temperature, high humidity, and corrosive gases such as sulfuric acid mist in actual production environments. This environment makes copper highly susceptible to oxidation, discoloration, and corrosion within a short period, leading to the formation of copper oxide, copper sulfate, and other salts. Since the conductivity of pure copper is much higher than that of copper oxide and copper sulfate, oxidation and corrosion at the contact points between the cathode / anode plates and the conductive plates significantly increase the contact resistance, resulting in a rise in cell voltage. This increase in cell voltage not only increases the DC power consumption for electrolysis but also negatively impacts the entire electrolytic refining process, reducing efficiency and increasing production costs. Current methods typically involve using dilute sulfuric acid to dissolve the copper oxide and copper sulfate salts at the contact points between the anode / cathode plates and the conductive plates, followed by rinsing the surface with clean water to remove any remaining solution, thereby reducing the resistance at the contact points.

[0003] Therefore, when using dilute sulfuric acid in electrolytic production, it is necessary to prepare industrial concentrated sulfuric acid into dilute sulfuric acid of the required concentration. However, the traditional method of acid preparation is usually done manually, which makes it difficult to guarantee the preparation accuracy and is easily affected by human factors. This results in large fluctuations in the concentration of the prepared dilute sulfuric acid, which cannot meet the strict requirements for the stability of dilute sulfuric acid concentration in the electrolytic refining process. In addition, the overall efficiency is low and cannot meet the needs of large-scale electrolytic refining production, which leads to production delays, increased production costs, and certain safety hazards. During the acid preparation process, there is a risk of acid leakage and splashing, which threatens the health of operators and the production environment. Utility Model Content

[0004] The purpose of this invention is to provide an automated, efficient, precise, safe, and reliable dilute sulfuric acid preparation system to solve the technical problems of unstable dilute sulfuric acid concentration, low preparation efficiency, significant safety hazards, and high production costs caused by traditional manual acid preparation methods in electrolytic refining production.

[0005] To solve the above technical problems, the solution adopted by this utility model is as follows:

[0006] A dilute sulfuric acid preparation system includes a concentrated sulfuric acid tank, a concentrated sulfuric acid high-level dosing tank, an acid mixing tank, a water inlet pipe, a dilute sulfuric acid tank, a delivery pipe, valves, and a delivery pump. The concentrated sulfuric acid tank, the concentrated sulfuric acid high-level dosing tank, the acid mixing tank, and the dilute sulfuric acid tank are connected sequentially via delivery pipes. The water inlet pipe is equipped with an inlet valve, one end of which is connected to an external water source, and the other end extends into the acid mixing tank. The acid mixing tank is equipped with a stirrer. The valves are installed on the delivery pipe. The delivery pumps include a concentrated sulfuric acid pump and a dilute sulfuric acid pump. The concentrated sulfuric acid pump is installed on the delivery pipe connecting the concentrated sulfuric acid tank and the concentrated sulfuric acid high-level dosing tank. The dilute sulfuric acid pump is installed on the delivery pipe connecting the acid mixing tank and the dilute sulfuric acid tank. The valves, water inlet valve, delivery pump, and stirrer are all powered by an external power source and are opened and closed by an external controller.

[0007] When using, add 98% concentrated sulfuric acid to the concentrated sulfuric acid tank, determine the required concentration of dilute sulfuric acid, and follow the formula: V 水 =1.84*(98-C) 稀硫酸 )*V 浓硫酸 / C 稀硫酸

[0008] In the formula: V 水 : The volume of water required, in liters (L);

[0009] 1.84: Density of concentrated sulfuric acid, in grams per milliliter (g / mL).

[0010] 98: Mass fraction of concentrated sulfuric acid, in percentage (%);

[0011] C 稀硫酸 Mass fraction of dilute sulfuric acid, expressed as a percentage (%).

[0012] V 浓硫酸 : The volume of concentrated sulfuric acid required, in liters (L);

[0013] The required amount of water is calculated, and the external controller opens the inlet valve to deliver the calculated amount of water into the acid mixing tank through the inlet pipe. Then, the inlet valve is closed, and all valves are closed. The valves on the delivery pipes between the concentrated sulfuric acid tank and the high-level dosing tank, along with the concentrated sulfuric acid pump, are opened to deliver the required concentrated sulfuric acid to the high-level dosing tank. The valves and pump are then closed, and the valve on the delivery pipe between the high-level dosing tank and the acid mixing tank is opened to allow the concentrated sulfuric acid to slowly flow into the water in the acid mixing tank. Simultaneously, the stirrer is turned on to mix the concentrated sulfuric acid and water evenly. Once all the concentrated sulfuric acid from the high-level dosing tank has flowed into the acid mixing tank and fully mixed with water to form the corresponding concentration of dilute sulfuric acid, the valve on the delivery pipe between the acid mixing tank and the dilute sulfuric acid tank, along with the dilute sulfuric acid pump, is opened to deliver all the dilute sulfuric acid from the acid mixing tank to the dilute sulfuric acid tank for storage.

[0014] Furthermore, the conveying pipe includes an acid outlet pipe, an acid delivery pipe A, an acid discharge pipe, and an acid delivery pipe B; the acid outlet pipe includes acid outlet pipe A, acid outlet pipe B, and acid outlet pipe C; both ends of acid outlet pipe A are connected to the lower side of the concentrated sulfuric acid tank and the input end of the concentrated sulfuric acid pump, respectively; both ends of acid delivery pipe A are connected to the output end of the concentrated sulfuric acid pump and the upper end of the concentrated sulfuric acid high-level dosing tank, respectively; one end of the acid discharge pipe is connected to the bottom end of the concentrated sulfuric acid high-level dosing tank, and the other end extends into the acid mixing tank; both ends of acid outlet pipe B are connected to the bottom end of the acid mixing tank and the input end of the dilute sulfuric acid pump, respectively; both ends of acid delivery pipe B are connected to the output end of the dilute sulfuric acid pump and the dilute sulfuric acid tank, respectively; acid outlet pipe C is installed on the lower side of the dilute sulfuric acid tank;

[0015] The system has six valves, namely valve A, valve B, valve C, valve D, valve E and valve F, which are respectively installed on the acid outlet pipe A, acid delivery pipe A, acid discharge pipe, acid outlet pipe B, acid delivery pipe B and acid outlet pipe C.

[0016] When concentrated sulfuric acid is delivered to the acid mixing tank, valves A and B, as well as the concentrated sulfuric acid pump, are opened simultaneously. The concentrated sulfuric acid flows out of the concentrated sulfuric acid tank through the acid outlet pipe A, and is pressurized by the concentrated sulfuric acid pump. It then flows through the acid delivery pipe to the concentrated sulfuric acid high-level dosing tank. When the delivered concentrated sulfuric acid reaches the set amount, valves A and B, and the concentrated sulfuric acid pump are closed, and valve C is opened. This allows the concentrated sulfuric acid from the high-level dosing tank to slowly flow into the acid mixing tank through the acid discharge pipe and mix with water to prepare dilute sulfuric acid. After preparation, valves D, the dilute sulfuric acid pump, and valve E are opened to deliver the prepared dilute sulfuric acid to the dilute sulfuric acid tank for storage through the acid outlet tank B and the acid delivery pipe B. When dilute sulfuric acid is needed, valve F is opened, and the dilute sulfuric acid is delivered through the acid outlet pipe C to the cleaning tank for cleaning the contact area between the anode and cathode plates and the conductive plate.

[0017] Furthermore, the high-level concentrated sulfuric acid dosing tank is equipped with an overflow pipe; one end of the overflow pipe is connected to the upper part of one side of the high-level concentrated sulfuric acid dosing tank, and the other end extends into the concentrated sulfuric acid tank. When the concentrated sulfuric acid delivered to the high-level concentrated sulfuric acid dosing tank rises to the inlet of the overflow pipe, the excess concentrated sulfuric acid will flow into the concentrated sulfuric acid tank through the overflow pipe for recovery, thereby stabilizing the liquid level in the high-level concentrated sulfuric acid dosing tank at a certain height, preventing concentrated sulfuric acid from leaking out of the high-level concentrated sulfuric acid dosing tank, reducing the environmental pollution, equipment corrosion and safety hazards that may be caused by leakage, and at the same time, keeping the concentrated sulfuric acid in the high-level concentrated sulfuric acid dosing tank at a fixed value, ensuring the stability and accuracy of the concentrated sulfuric acid supply during the production process.

[0018] Furthermore, a level gauge is installed at the top of the acid mixing tank; the bottom end of the level gauge extends into the acid mixing tank. The bottom end of the level gauge extends into the acid mixing tank to monitor the liquid level and transmit the data to the controller. When water is added to the acid mixing tank, the data is also transmitted to the controller, allowing the controller to quickly close the inlet valve on the inlet pipe, preventing excessive water in the acid mixing tank and thus avoiding a low concentration of dilute sulfuric acid.

[0019] The working principle of this utility model is as follows:

[0020] During use, the required amount of water is calculated according to the formula. An external controller opens the inlet valve, adding the corresponding amount of water to the acid mixing tank. Afterward, the inlet valve closes. During the water addition process, a level gauge continuously monitors the water level in the acid mixing tank. After the inlet valve closes, valves A and B, as well as the concentrated sulfuric acid pump, are simultaneously opened. Concentrated sulfuric acid flows out of the concentrated sulfuric acid tank through outlet pipe A and is pressurized by the pump, flowing through the delivery pipe to the high-level concentrated sulfuric acid dosing tank. An overflow pipe on one side of the high-level dosing tank allows excess concentrated sulfuric acid to overflow back into the tank, ensuring a stable supply during production. If the concentrated sulfuric acid overflows from the high-level dosing tank, the valve is closed. Close valves A and B and the concentrated sulfuric acid pump, and wait for the concentrated sulfuric acid in the high-level metering tank to stop overflowing. At the same time, open valve C and the stirrer to allow the concentrated sulfuric acid from the high-level metering tank to slowly flow into the acid mixing tank through the acid discharge pipe. Stir the mixture with water to prepare dilute sulfuric acid. After all the concentrated sulfuric acid in the high-level metering tank has been added to the acid mixing tank, stop the stirrer and close valve C. Open valve D, the dilute sulfuric acid pump, and valve E to transport the prepared dilute sulfuric acid to the dilute sulfuric acid tank for storage through acid outlet tank B and acid delivery pipe B. When dilute sulfuric acid is needed, open valve F and transport the dilute sulfuric acid to the cleaning tank for cleaning the contact area between the anode and cathode plates and the conductive plate through acid outlet pipe C.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. This utility model, through the combination of concentrated sulfuric acid tank, concentrated sulfuric acid pump and concentrated sulfuric acid high-level dosing tank, can accurately control the amount of concentrated sulfuric acid used. The water inlet valve on the water inlet pipe can accurately control the water inlet volume. The stirrer can fully mix the concentrated sulfuric acid with water to ensure uniform concentration of dilute sulfuric acid. The whole process is automated to prepare the acid, effectively avoiding human interference, making the concentration of dilute sulfuric acid stable, meeting the strict requirements of electrolytic refining production for the stability of dilute sulfuric acid concentration, and can effectively improve production efficiency, reduce production costs, and ensure high safety.

[0023] 2. The overflow pipe of the high-level concentrated sulfuric acid dosing tank of this utility model can ensure the dosage of concentrated sulfuric acid in the high-level concentrated sulfuric acid dosing tank, thereby ensuring the stability of the concentration of dilute sulfuric acid preparation, while effectively preventing concentrated sulfuric acid leakage and ensuring production safety. The liquid level gauge at the top of the acid preparation tank can monitor the liquid level in the acid preparation tank in real time, determine the liquid level height in the acid preparation tank, and facilitate the controller to accurately control the water inlet through the water inlet valve to ensure the stability of the dilute sulfuric acid concentration. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0025] In the diagram: 1. Concentrated sulfuric acid tank; 2. Valve A; 3. Acid outlet pipe A; 4. Concentrated sulfuric acid pump; 5. Valve B; 6. Acid delivery pipe A; 7. Concentrated sulfuric acid high-level dosing tank; 8. Overflow pipe; 9. Acid discharge pipe; 10. Valve C; 11. Acid mixing tank; 12. Level gauge; 13. Agitator; 14. Water inlet pipe; 15. Water inlet valve; 16. Valve D; 17. Dilute sulfuric acid pump; 18. Acid delivery pipe B; 19. Valve E; 20. Dilute sulfuric acid tank; 21. Valve F; 22. Acid outlet pipe B; 23. Acid outlet pipe C. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] The following is a detailed description of the dilute sulfuric acid preparation system of this utility model with reference to the accompanying drawings: Example

[0029] A dilute sulfuric acid preparation system includes a concentrated sulfuric acid tank 1, a concentrated sulfuric acid high-level dosing tank 7, an acid mixing tank 11, a water inlet pipe 14, a dilute sulfuric acid tank 20, a delivery pipe, valves, and a delivery pump. The concentrated sulfuric acid tank 1, the concentrated sulfuric acid high-level dosing tank 7, the acid mixing tank 11, and the dilute sulfuric acid tank 20 are connected sequentially via delivery pipes. The water inlet pipe 14 is equipped with a water inlet valve 15, with one end connected to an external water source and the other end extending into the acid mixing tank 11. The acid mixing tank 11 is equipped with a stirrer 13. The valves are installed on the delivery pipe. The delivery pumps include a concentrated sulfuric acid pump 4 and a dilute sulfuric acid pump 17. The concentrated sulfuric acid pump 4 is installed on the delivery pipe connecting the concentrated sulfuric acid tank 1 and the concentrated sulfuric acid high-level dosing tank 7. The dilute sulfuric acid pump 17 is installed on the delivery pipe connecting the acid mixing tank 11 and the dilute sulfuric acid tank 20. The specifications of the concentrated sulfuric acid high-level metering tank 7 are φ400×800mm, and the volume of sulfuric acid added each time is 75.36L. The specifications of the acid mixing tank 11 are φ1000×1500mm.

[0030] The working principle of this embodiment is as follows:

[0031] When using it, add 98% concentrated sulfuric acid to the concentrated sulfuric acid tank to determine the concentration of the dilute sulfuric acid to be 20%, according to the formula: V 水 =1.84*(98-C) 稀硫酸 )*V 浓硫酸 / C 稀硫酸

[0032] In the formula: V 水 : The volume of water required, in liters (L);

[0033] 1.84: Density of concentrated sulfuric acid, in grams per milliliter (g / mL).

[0034] 98: Mass fraction of concentrated sulfuric acid, in percentage (%);

[0035] C 稀硫酸 Mass fraction of dilute sulfuric acid, expressed as a percentage (%).

[0036] V 浓硫酸 : The volume of concentrated sulfuric acid required, in liters (L);

[0037] The calculated required water volume is 581.60 L. The water level in the acid mixing tank is 0.74 m. The external controller opens the inlet valve 15, supplying the calculated water volume into the acid mixing tank 11 via the inlet pipe 14. Then, the inlet valve 15 is closed, leaving all valves closed. The valves on the delivery pipes between the concentrated sulfuric acid tank 1 and the concentrated sulfuric acid high-level dosing tank 7, as well as the concentrated sulfuric acid pump 4, are opened to deliver the required concentrated sulfuric acid to the concentrated sulfuric acid high-level dosing tank 7. Finally, the valves and the concentrated sulfuric acid pump 4 are closed. Open the valve on the delivery pipe between the concentrated sulfuric acid high-level dosing tank 7 and the acid mixing tank 11 to allow the concentrated sulfuric acid to slowly flow into the water in the acid mixing tank. At the same time, turn on the stirrer 13 to mix the concentrated sulfuric acid and water evenly. After all the concentrated sulfuric acid in the concentrated sulfuric acid high-level dosing tank 7 has flowed into the acid mixing tank 11 and been fully mixed with water to form dilute sulfuric acid of the corresponding concentration, open the valve on the delivery pipe between the acid mixing tank 11 and the dilute sulfuric acid tank 20 and the dilute sulfuric acid pump 17 to transfer all the dilute sulfuric acid in the acid mixing tank 11 to the dilute sulfuric acid tank 20 for storage. Example

[0038] The difference from Embodiment 1 is that the conveying pipe includes an acid outlet pipe, an acid delivery pipe A6, an acid discharge pipe 9, and an acid delivery pipe B18; the acid outlet pipe includes an acid outlet pipe A3, an acid outlet pipe B22, and an acid outlet pipe C23; the two ends of the acid outlet pipe A3 are respectively connected to the lower side of the concentrated sulfuric acid tank 1 and the input end of the concentrated sulfuric acid pump 4; the two ends of the acid delivery pipe A6 are respectively connected to the output end of the concentrated sulfuric acid pump 4 and the upper end of the concentrated sulfuric acid high-level dosing tank 7; one end of the acid discharge pipe 9 is connected to the bottom end of the concentrated sulfuric acid high-level dosing tank 7, and the other end extends into the acid mixing tank 11; the two ends of the acid outlet pipe B22 are respectively connected to the bottom end of the acid mixing tank 11 and the input end of the dilute sulfuric acid pump 17; the two ends of the acid delivery pipe B18 are respectively connected to the output end of the dilute sulfuric acid pump 17 and the dilute sulfuric acid tank 20; the acid outlet pipe C23 is installed on the lower side of the dilute sulfuric acid tank 20.

[0039] The system includes six valves: valve A2, valve B5, valve C10, valve D16, valve E19, and valve F21, which are respectively installed on the acid outlet pipe A3, acid delivery pipe A6, acid discharge pipe 9, acid outlet pipe B22, acid delivery pipe B18, and acid outlet pipe C23. The concentrated sulfuric acid high-level dosing tank 7 is equipped with an overflow pipe 8. One end of the overflow pipe 8 is connected to the upper part of one side of the concentrated sulfuric acid high-level dosing tank 7, and the other end extends into the concentrated sulfuric acid tank 1. The acid mixing tank 11 is equipped with a level gauge 12 at its top. The bottom end of the level gauge 12 extends into the acid mixing tank 11.

[0040] The specific operating steps are as follows:

[0041] S1. Prepare 20% dilute sulfuric acid. The overflow level of overflow pipe 8 is set at 600mm above the high-level metering tank 7 for concentrated sulfuric acid. The volume of concentrated sulfuric acid added each time is fixed at 75.36L. According to the formula: V_water = 1.84 * (98 - C) 稀硫酸 )*V 浓硫酸 / C 稀硫酸 The required water volume is calculated to be 581.60L, which means the water level in the acid preparation tank is 0.74m.

[0042] S2. Open the water inlet valve 15 and add 581.60L of water into the acid mixing tank 11 through the water inlet pipe 14. When the liquid level in the acid mixing tank 11 reaches 0.74m, observe through the level gauge 12. Then close the water inlet valve 15 and stop adding production water.

[0043] S3. Open valves A2 and B5, turn on sulfuric acid pump 4 to add sulfuric acid to sulfuric acid high-level metering tank 7. When overflow occurs in overflow pipe 8 on one side of sulfuric acid high-level metering tank 7, turn off sulfuric acid pump 4 and close valves A2 and B5.

[0044] S4. When there is no overflow from the overflow pipe 8 on one side of the high-level sulfuric acid metering tank 7, turn on the agitator 13, open the valve C10, slowly add sulfuric acid into the acid mixing tank 11, and turn on the agitator 13 to stir. Mix the acid in the acid mixing tank 11.

[0045] S5. After all the sulfuric acid in the concentrated sulfuric acid high-level metering tank 7 has been added to the acid preparation tank 11, close valve C10 and stop stirrer 13. The dilute sulfuric acid preparation is complete.

[0046] S6. Open valves D16 and E19, start dilute sulfuric acid pump 17, and transport the prepared dilute sulfuric acid to dilute sulfuric acid storage tank 20 through acid outlet pipe B and acid delivery pipe B.

[0047] S7. When using dilute sulfuric acid, open valve F and deliver the dilute sulfuric acid through acid outlet pipe C23 to the cleaning tank for cleaning the contact area between the cathode and anode plates and the conductive plate.

[0048] The working principle of this embodiment is the same as that of Embodiment 1.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dilute sulfuric acid preparation system, characterized in that: The system includes a concentrated sulfuric acid tank (1), a concentrated sulfuric acid high-dosage tank (7), an acid mixing tank (11), a water inlet pipe (14), a dilute sulfuric acid tank (20), a delivery pipe, valves, and a delivery pump. The concentrated sulfuric acid tank (1), the concentrated sulfuric acid high-dosage tank (7), the acid mixing tank (11), and the dilute sulfuric acid tank (20) are connected in sequence by delivery pipes. The water inlet pipe (14) is equipped with a water inlet valve (15), with one end connected to an external water source and the other end extending into the acid mixing tank (11). The acid mixing tank (11) is equipped with a stirrer (13). The valves are installed on the delivery pipes. The delivery pumps include a concentrated sulfuric acid pump (4) and a dilute sulfuric acid pump (17). The concentrated sulfuric acid pump (4) is installed on the delivery pipe connecting the concentrated sulfuric acid tank (1) and the concentrated sulfuric acid high-dosage tank (7). The dilute sulfuric acid pump (17) is installed on the delivery pipe connecting the acid mixing tank (11) and the dilute sulfuric acid tank (20).

2. The dilute sulfuric acid preparation system according to claim 1, characterized in that: The delivery pipe includes an acid outlet pipe, an acid delivery pipe A (6), an acid discharge pipe (9), and an acid delivery pipe B (18); the acid outlet pipe includes an acid outlet pipe A (3), an acid outlet pipe B (22), and an acid outlet pipe C (23); the two ends of the acid outlet pipe A (3) are respectively connected to the lower side of the concentrated sulfuric acid tank (1) and the input end of the concentrated sulfuric acid pump (4); the two ends of the acid delivery pipe A (6) are respectively connected to the output end of the concentrated sulfuric acid pump (4) and the upper end of the concentrated sulfuric acid high-level dosing tank (7); the acid discharge pipe A (9) and the acid delivery pipe B (18 ... One end of the acid tube (9) is connected to the bottom of the concentrated sulfuric acid high-level dosing tank (7), and the other end extends into the inside of the acid mixing tank (11); the two ends of the acid outlet tube B (22) are respectively connected to the bottom of the acid mixing tank (11) and the input end of the dilute sulfuric acid pump (17); the two ends of the acid delivery tube B (18) are respectively connected to the output end of the dilute sulfuric acid pump (17) and the dilute sulfuric acid tank (20); the acid outlet tube C (23) is installed on the lower side of the dilute sulfuric acid tank (20); The valves are six in number: valve A (2), valve B (5), valve C (10), valve D (16), valve E (19) and valve F (21), and are respectively installed on the acid outlet pipe A (3), acid delivery pipe A (6), acid discharge pipe (9), acid outlet pipe B (22), acid delivery pipe B (18) and acid outlet pipe C (23).

3. The dilute sulfuric acid preparation system according to claim 1, characterized in that: The high-level dose tank (7) of concentrated sulfuric acid is provided with an overflow pipe (8); one end of the overflow pipe (8) is connected to the upper part of one side of the high-level dose tank (7) of concentrated sulfuric acid, and the other end extends into the concentrated sulfuric acid tank (1).

4. The dilute sulfuric acid preparation system according to claim 1, characterized in that: The acid mixing tank (11) is equipped with a level gauge (12) at the top; the bottom end of the level gauge (12) extends into the acid mixing tank (11).

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