Lye preparation device

Abstract

The utility model discloses a lye preparation device belongs to lye preparation technical field, mainly used for preparation of sodium hydroxide solution. The technical problem that the utility model is to solve provides a lye preparation device, including the lye preparation tank that has the supernatant input pipe, sodium hydroxide input pipe and liquid outlet pipe in intercommunication, and the liquid outlet pipe is connected with lye reflux pipe and lye output pipe, and lye reflux pipe is linked with lye preparation tank intercommunication, and the supernatant input pipe, sodium hydroxide input pipe all are equipped with corresponding flowmeter, regulating valve on, and lye output pipe, lye reflux pipe all are equipped with corresponding switch valve on, and the liquid outlet pipe is equipped with PH detector, PH display controller, and PH display controller is electrically connected with lye output, lye reflux's switch valve and sodium hydroxide regulating valve. The device utilizes liquid sodium hydroxide to realize raw material automatic input preparation through pipeline, and PH detector, PH display controller detects lye PH value in real time, and adjusts raw material input quantity in time, realizes accurate, high -yield lye preparation.

Description

Technical Field

[0001] This utility model relates to the field of alkali preparation technology, and in particular to an alkali preparation device. Background Technology

[0002] Alkali solutions, such as liquid sodium hydroxide, are used as regulators or precipitants in lithium preparation and purification processes. Most existing methods for preparing alkali solutions involve manual preparation. Specifically, the supernatant is manually added to a preparation tank, followed by the addition of caustic soda flakes (solid sodium hydroxide) depending on the amount of supernatant, and then stirring. The pH value is controlled between 10 and 12, measured manually using pH test paper. However, this method of preparing alkali solutions is labor-intensive for operators, and the amount of alkali prepared and the pH value cannot be precisely controlled. Furthermore, the pH value obtained through manual sampling and pH test paper testing fluctuates significantly, which is detrimental to the stability of the production process. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an alkaline solution preparation device, mainly used for the preparation of sodium hydroxide solution, so as to reduce the labor intensity of personnel and achieve precise control of pH value.

[0004] This utility model discloses an alkaline solution preparation device, including an alkaline solution preparation tank. The inlet of the alkaline solution preparation tank is connected to a supernatant input pipe and a sodium hydroxide input pipe. The outlet of the alkaline solution preparation tank is connected to an outlet pipe. The other end of the outlet pipe is connected to an alkaline solution return pipe and an alkaline solution output pipe for discharging alkaline solution to the outside. The outlet of the alkaline solution return pipe is connected to the inlet of the alkaline solution preparation tank. A supernatant flow meter and a supernatant regulating valve are sequentially installed on the supernatant input pipe, and sodium hydroxide is sequentially installed on the sodium hydroxide input pipe. The system includes a flow meter and a sodium hydroxide regulating valve. The alkali output pipe is equipped with an alkali output switch valve to control the outflow of alkali solution, and the alkali return pipe is equipped with an alkali return switch valve to control the reflux of alkali solution. At least one of the alkali output switch valve and the alkali return switch valve is in a closed state during alkali solution preparation. The outlet pipe is equipped with a pH detector, which is electrically connected to a pH display controller. The pH display controller is electrically connected to the alkali output switch valve, the alkali return switch valve, and the sodium hydroxide regulating valve.

[0005] Furthermore, the alkaline solution preparation tank is equipped with a stirring mechanism, and the transmission end of the stirring mechanism passes through the top of the alkaline solution preparation tank and is connected to the drive motor.

[0006] Furthermore, the outlet of the alkali preparation tank is connected to a transfer pump, and the outlet of the transfer pump is connected to the liquid outlet pipe.

[0007] As a preferred embodiment, the outlet of the delivery pump is also provided with a pressure gauge for detecting the outlet pressure of the delivery pump and a first manual shut-off valve for controlling the connection between the delivery pump and the outlet pipe.

[0008] As a preferred embodiment, a check valve is also provided between the outlet of the delivery pump and the first manual shut-off valve.

[0009] As a preferred embodiment, a second manual shut-off valve is also provided between the delivery pump and the alkali preparation tank.

[0010] Furthermore, the alkali preparation tank is also equipped with an alkali preparation tank level gauge for detecting the liquid level in the alkali preparation tank. The alkali preparation tank level gauge is electrically connected to an alkali preparation tank level display controller, and the alkali preparation tank level display controller is electrically connected to the supernatant regulating valve.

[0011] Furthermore, the supernatant flow meter is electrically connected to a supernatant flow accumulation display, and the sodium hydroxide flow meter is electrically connected to a sodium hydroxide flow accumulation display.

[0012] Furthermore, the inlet of the alkali preparation tank is located at the top of the alkali preparation tank, and the outlet of the alkali preparation tank is located at the bottom of the alkali preparation tank.

[0013] The beneficial effects of this utility model are as follows: This alkali solution preparation device, by setting a supernatant inlet pipe, a sodium hydroxide inlet pipe, and an outlet pipe on the alkali solution preparation tank, utilizes liquid sodium hydroxide for alkali solution preparation, converting the manual addition of caustic soda flakes (solid sodium hydroxide) into pipeline flow addition, realizing automatic preparation of alkali solution in the alkali solution preparation tank. Furthermore, the setting of a supernatant flow meter, a supernatant regulating valve, a sodium hydroxide flow meter, and a sodium hydroxide regulating valve enables precise control of raw material usage. A pH detector is installed on the outlet pipe to achieve automatic continuous online measurement, ensuring precise control of the alkali solution's pH value. Through the design of a pH display controller, an alkali solution reflux pipe, an alkali solution output pipe, an alkali solution output switch valve, an alkali solution reflux switch valve, and a sodium hydroxide regulating valve, it ensures that substandard alkali solution is automatically circulated and mixed, avoiding ineffective output, and timely adjusting the input of the sodium hydroxide inlet pipe to improve preparation accuracy. This achieves precise and high-yield alkali solution preparation, solving the problems of high manual input and coarse pH value control. Attached Figure Description

[0014] Figure 1 : A schematic diagram of the alkali solution preparation device provided by this utility model;

[0015] Reference numerals in the attached drawings: 1-Alkali preparation tank; 11-Stirring mechanism; 12-Drive motor; 13-Alkali preparation tank level gauge; 14-Alkali preparation tank level display controller; 2-Supernatant input pipe; 21-Supernatant flow meter; 22-Supernatant regulating valve; 23-Supernatant flow cumulative display; 3-Sodium hydroxide input pipe; 31-Sodium hydroxide flow meter; 32-Sodium hydroxide regulating valve; 33-Sodium hydroxide flow cumulative display; 4-Outlet pipe; 41-pH detector; 42-pH display controller; 5-Alkali output pipe; 51-Alkali output switch valve; 6-Alkali reflux pipe; 61-Alkali reflux switch valve; 7-Transfer pump; 71-Pressure gauge; 72-First manual shut-off valve; 73-Check valve; 74-Second manual shut-off valve. Detailed Implementation

[0016] The present invention will be further described below.

[0017] This utility model provides an alkaline solution preparation device, mainly used for the preparation of sodium hydroxide solution. It includes an alkaline solution preparation tank 1, the inlet of which is connected to a supernatant input pipe 2 and a sodium hydroxide input pipe 3; the outlet of the alkaline solution preparation tank 1 is connected to an outlet pipe 4; the other end of the outlet pipe 4 is connected to an alkaline solution return pipe 6 and an alkaline solution output pipe 5 for discharging alkaline solution to the outside, and the outlet of the alkaline solution return pipe 6 is connected to the inlet of the alkaline solution preparation tank 1; a supernatant flow meter 21 and a supernatant regulating valve 22 are sequentially installed on the supernatant input pipe 2, and sodium hydroxide is sequentially installed on the sodium hydroxide input pipe 3. The system includes a flow meter 31 and a sodium hydroxide regulating valve 32. The alkali output pipe 5 is equipped with an alkali output switch valve 51 for controlling the outflow of alkali solution, and the alkali return pipe 6 is equipped with an alkali return switch valve 61 for controlling the return of alkali solution. At least one of the alkali output switch valve 51 and the alkali return switch valve 61 is in a closed state during alkali solution preparation. The outlet pipe 4 is equipped with a pH detector 41, which is electrically connected to a pH display controller 42. The pH display controller 42 is electrically connected to the alkali output switch valve 51, the alkali return switch valve 61, and the sodium hydroxide regulating valve 32.

[0018] like Figure 1As shown, the alkali solution preparation device includes an alkali solution preparation tank 1, which is used to hold and mix liquid sodium hydroxide and supernatant to prepare alkali solution. The top of the alkali solution preparation tank 1 is connected to a supernatant inlet pipe 2 and a sodium hydroxide inlet pipe 3 to input the raw materials used for alkali solution preparation. To facilitate recording and observing the input amount of raw materials, a supernatant flow meter 21 is installed on the supernatant inlet pipe 2, and a sodium hydroxide flow meter 31 is installed on the sodium hydroxide inlet pipe 3. To facilitate controlling the input amount of raw materials to adjust the alkali solution concentration in the alkali solution preparation tank 1, so that the alkali solution output from the alkali solution preparation tank 1 meets the qualified standard, a supernatant flow meter 21 is installed on the supernatant inlet pipe 2. A supernatant regulating valve 22 is installed on the supernatant inlet pipe 2, and a sodium hydroxide regulating valve 32 is installed on the sodium hydroxide inlet pipe 3. The bottom of the alkali preparation tank 1 is connected to an outlet pipe 4 to output the prepared alkali solution. An alkali output pipe 5 and an alkali return pipe 6 are connected to the outlet pipe 4 via a tee fitting. The alkali output pipe 5 is used to output qualified alkali solution with a pH value between 10 and 12. The alkali return pipe 6 is used to return unqualified alkali solution with a pH value outside the 10-12 range back into the alkali preparation tank 1. The alkali output pipe 5 is equipped with an alkali output switch valve 51 to control the outflow of alkali solution, and the alkali return pipe 6 is equipped with a valve to control the return of alkali solution. The alkali solution reflux switch valve 61, alkali solution output switch valve 51, and alkali solution reflux switch valve 61 are all closed during alkali solution preparation. This ensures that the alkali solution output from the outlet pipe 4 can enter the corresponding alkali solution output pipe 5 or alkali solution reflux pipe 6 based on whether the pH value detected by the pH detector is qualified. The pH detector 41 detects the pH value of the alkali solution flowing through the outlet pipe 4 in real time and feeds it back to the pH display controller 42, which is electrically connected to the pH detector 41. The pH display controller 42 is used to display the pH value measured by the pH detector 41 for operator verification. The pH display controller 42 is connected to the alkali solution output switch valve 51. The output switch valve 51 and the alkali reflux switch valve 61 are electrically connected to control the opening and closing of the alkali output switch valve 51 and the alkali reflux switch valve 61, so as to control the flow direction of the alkali output from the outlet pipe 4 according to whether the pH value of the prepared alkali is qualified; the pH display controller 42 is also electrically connected to the sodium hydroxide regulating valve 32 to control the opening and closing of the sodium hydroxide regulating valve 32, and then adjusts the input amount of liquid sodium hydroxide according to the pH value of the alkali detected by the pH detector 41, and adjusts the amount of liquid sodium hydroxide used in the prepared alkali in a timely manner, realizing online accurate measurement of the pH value of the alkali during the preparation process, and ensuring the quality of the prepared alkali.When the pH detector 41 detects that the pH value of the alkaline solution in the outlet pipe 4 is 10-12, it is considered a qualified alkaline solution. At this time, the pH detector 41 transmits a signal to the pH display controller 42, which controls the alkaline solution output switch valve 51 to open and the alkaline solution return switch valve 61 to close, allowing the qualified alkaline solution to flow through the alkaline solution output pipe 5 to the external pipeline network for use. When the pH detector 41 detects that the pH value of the alkaline solution in the outlet pipe 4 is not 10-12, it is considered an unqualified alkaline solution. At this time, the pH detector 41 transmits a signal to the pH display controller 42. 2. Transmitting signals: The pH display controller 42 controls the alkali output switch valve 51 to close and the alkali return switch valve 61 to open, so that the unqualified alkali flows through the alkali return pipe 6 to the alkali preparation tank 1 for reconfiguration. At the same time, the pH display controller 42 controls the sodium hydroxide regulating valve 32 to open, and reconfigure by adding liquid sodium hydroxide again, until the pH detector 41 set on the outlet pipe 4 detects that the pH value of the alkali flowing through the outlet pipe 4 is 10-12, and then it is output to the external pipeline network through the alkali output pipe 5 for use. This alkali solution preparation device, by setting up a supernatant inlet pipe 2, a sodium hydroxide inlet pipe 3, and an outlet pipe 4 on the alkali solution preparation tank 1, utilizes liquid sodium hydroxide for alkali solution preparation, converting the manual addition of caustic soda flakes (solid sodium hydroxide) into pipeline flow addition, realizing automatic preparation of alkali solution within the alkali solution preparation tank 1. Furthermore, the device features a supernatant flow meter 21, a supernatant regulating valve 22, a sodium hydroxide flow meter 31, and a sodium hydroxide regulating valve 32, enabling precise control of raw material usage. A pH detector 41 installed on the outlet pipe 4 allows for automatic continuous online measurement, ensuring precise control of the alkali solution's pH value. The design of the pH display controller 42, alkali solution reflux pipe 6, alkali solution output pipe 5, alkali solution output switch valve 51, alkali solution reflux switch valve 61, and sodium hydroxide regulating valve 32 ensures that substandard alkali solution is automatically circulated and mixed, avoiding ineffective output, and promptly adjusting the input of sodium hydroxide into the inlet pipe 3 to improve preparation accuracy. This achieves precise and high-yield alkali solution preparation, solving the problems of high manual input and inefficient pH control.

[0019] To ensure rapid mixing of the supernatant and liquid sodium hydroxide in alkaline solution preparation tank 1, thereby improving solution preparation efficiency; such as Figure 1As shown, the alkali solution preparation tank 1 is equipped with a stirring mechanism 11. The transmission end of the stirring mechanism 11 passes through the top of the alkali solution preparation tank 1 and is connected to the drive motor 12. By setting the stirring mechanism 11 inside the alkali solution preparation tank 1, the stirring mechanism 11 forcibly breaks the solution concentration gradient, shortens the mixing time, and connects the transmission end of the stirring mechanism 11 through the top of the alkali solution preparation tank 1 to the drive motor 12 located outside, so that the stirrer of the stirring mechanism 11 is located inside the tank, ensuring the durability of the equipment in the alkaline environment. The stirring mechanism 11 can be an existing paddle stirrer, frame stirrer, or submersible stirrer to stir and mix the supernatant and liquid sodium hydroxide in the alkali solution preparation tank 1. However, the material of the stirrer must be a corrosion-resistant material, such as stainless steel or titanium alloy.

[0020] To ensure that the alkali solution output from the alkali preparation tank 1 can flow stably along the outlet pipe 4 to the alkali solution output pipe 5 or the alkali solution return pipe 6, such as Figure 1 As shown, the outlet of the alkali preparation tank 1 is connected to a transfer pump 7, and the outlet of the transfer pump 7 is connected to the liquid outlet pipe 4. By adding a transfer pump 7 connected to the liquid outlet pipe 4 at the outlet of the alkali preparation tank 1, the transfer pump 7 provides a stable transfer pressure, ensuring a constant flow rate in the liquid outlet pipe 4, and overcoming gravity to be suitable for alkali transfer in different scenarios, such as the scenario of transporting alkali from a low place to a high place. To ensure the normal operation of the transfer pump 7 and the outlet pipe 4 by real-time monitoring of the outlet pressure of the transfer pump 7, the outlet of the transfer pump 7 is also equipped with a pressure gauge 71 for detecting the outlet pressure of the transfer pump 7 and a first manual shut-off valve 72 for controlling the connection between the transfer pump 7 and the outlet pipe 4. By setting the pressure gauge 71 at the outlet of the transfer pump 7, the outlet pressure of the transfer pump 7 is monitored in real time. If the pressure gauge 71 detects that the pressure exceeds the set threshold, the pressure gauge 71 alarms, and the operator immediately uses the first manual shut-off valve 72 to cut off the pressure in an emergency to avoid excessive pressure. Furthermore, to prevent the alkaline solution from backflowing and impacting the pump body when the transfer pump 7 stops, a check valve 73 is also provided between the outlet of the transfer pump 7 and the first manual shut-off valve 72. By setting the check valve 73, the backflow of the prepared alkaline solution during the transfer process of the transfer pump 7 can be effectively prevented. As a preferred embodiment, to further ensure the safety of alkali delivery from the alkali preparation tank 1 and the transfer pump 7, a second manual shut-off valve 74 is also provided between the transfer pump 7 and the alkali preparation tank 1. The addition of the second manual shut-off valve 74 achieves physical isolation between the transfer pump 7 and the alkali preparation tank 1, facilitating maintenance without the risk of residual alkali. Furthermore, the design of the double shut-off valve, together with the check valve 73, constitutes triple safety protection to ensure the safety of alkali delivery using the transfer pump 7.

[0021] To ensure the correct liquid level in the alkali preparation tank 1, preventing overflow due to excessive liquid or insufficient mixing by the agitator due to insufficient liquid level; Figure 1As shown, the alkali preparation tank 1 is also equipped with an alkali preparation tank level gauge 13 for detecting the liquid level inside the alkali preparation tank 1. The alkali preparation tank level gauge 13 is electrically connected to an alkali preparation tank level display controller 14, which is electrically connected to the supernatant regulating valve 22. By installing the alkali preparation tank level gauge 13 on the alkali preparation tank 1 to detect the liquid level inside the tank, the input and output of the liquid in the tank are detected. The alkali preparation tank level display controller 14, which is electrically connected to the alkali preparation tank level gauge 13, is used to detect the liquid level inside the tank. The controller 14 is used to display the liquid level in the tank in real time. The alkali preparation tank liquid level display controller 14 is electrically connected to the supernatant regulating valve 22 to control the opening and closing of the supernatant regulating valve 22. The alkali preparation tank liquid level display controller 14 receives the signal from the alkali preparation tank liquid level gauge 13 and determines whether the liquid level is too high or too low. When it is too high, it controls the supernatant regulating valve 22 to close to prevent the input of supernatant. When it is too low, it controls the supernatant regulating valve 22 to open and input supernatant into the alkali preparation tank 1 to quickly increase the liquid level in the tank.

[0022] To facilitate recording the input volume of supernatant and liquid sodium hydroxide, so that the input volume of liquid sodium hydroxide and supernatant can be adjusted based on the detection results of pH detector 41, such as... Figure 1 As shown, the supernatant flow meter 21 is electrically connected to the supernatant flow accumulation display 23, and the sodium hydroxide flow meter 31 is electrically connected to the sodium hydroxide flow accumulation display 33. By setting the supernatant flow accumulation display 23 and the sodium hydroxide flow accumulation display 33, the input data of supernatant and sodium hydroxide can be traced, so as to verify the dosage ratio of the prepared alkali solution in the future.

[0023] To ensure better mixing of the solutions in alkaline solution preparation tank 1, and to ensure that all the alkaline solution prepared in alkaline solution preparation tank 1 can be discharged, such as Figure 1 As shown, the inlet of the alkali preparation tank 1 is located at the top of the alkali preparation tank 1, and the outlet of the alkali preparation tank 1 is located at the bottom of the alkali preparation tank 1. Setting the outlet at the bottom of the alkali preparation tank 1 makes it easier to discharge all the prepared solution in the tank and reduce residue. Setting the inlet at the top of the alkali preparation tank 1 can reduce the splashing of liquid entering the tank and improve the mixing efficiency.

Claims

1. A caustic solution preparation apparatus characterized by: The system includes an alkali preparation tank (1), the inlet of which is connected to a supernatant input pipe (2) and a sodium hydroxide input pipe (3); the outlet of the alkali preparation tank (1) is connected to an outlet pipe (4); the other end of the outlet pipe (4) is connected to an alkali return pipe (6) and an alkali output pipe (5) for outputting alkali to the outside, and the outlet of the alkali return pipe (6) is connected to the inlet of the alkali preparation tank (1); a supernatant flow meter (21) and a supernatant regulating valve (22) are sequentially installed on the supernatant input pipe (2), and a sodium hydroxide flow meter (31) and a sodium hydroxide regulating valve (31) are sequentially installed on the sodium hydroxide input pipe (3). 32), the alkali output pipe (5) is provided with an alkali output switch valve (51) for controlling the flow of alkali, and the alkali return pipe (6) is provided with an alkali return switch valve (61) for controlling the return of alkali. At least one of the alkali output switch valve (51) and the alkali return switch valve (61) is in the closed state when the alkali is prepared; the outlet pipe (4) is provided with a pH detector (41), and the pH detector (41) is electrically connected to a pH display controller (42). The pH display controller (42) is electrically connected to the alkali output switch valve (51), the alkali return switch valve (61), and the sodium hydroxide regulating valve (32).

2. The alkali solution preparation apparatus according to claim 1, wherein The alkaline solution preparation tank (1) is equipped with a stirring mechanism (11), and the transmission end of the stirring mechanism (11) passes through the top of the alkaline solution preparation tank (1) and is connected to the drive motor (12) for transmission.

3. The alkali solution preparation apparatus according to claim 1, wherein The outlet of the alkali preparation tank (1) is connected to a transfer pump (7), and the outlet of the transfer pump (7) is connected to the liquid outlet pipe (4).

4. The alkali solution preparation apparatus according to claim 3, wherein The outlet of the delivery pump (7) is also provided with a pressure gauge (71) for detecting the outlet pressure of the delivery pump (7) and a first manual shut-off valve (72) for controlling the connection between the delivery pump (7) and the outlet pipe (4).

5. The alkali solution preparation apparatus according to claim 4, wherein A check valve (73) is also provided between the outlet of the delivery pump (7) and the first manual shut-off valve (72).

6. The alkali solution preparation apparatus as described in claim 3 or 4, characterized in that: A second manual shut-off valve (74) is also provided between the delivery pump (7) and the alkali preparation tank (1).

7. The alkali solution preparation apparatus as described in claim 1, characterized in that: The alkaline solution preparation tank (1) is also equipped with an alkaline solution preparation tank level gauge (13) for detecting the liquid level in the alkaline solution preparation tank. The alkaline solution preparation tank level gauge (13) is electrically connected to an alkaline solution preparation tank level display controller (14). The alkaline solution preparation tank level display controller (14) is electrically connected to a supernatant regulating valve (22).

8. The alkali solution preparation apparatus as described in claim 1, characterized in that: The supernatant flow meter (21) is electrically connected to a supernatant flow accumulation display (23), and the sodium hydroxide flow meter (31) is electrically connected to a sodium hydroxide flow accumulation display (33).

9. The alkali solution preparation apparatus as described in claim 1, characterized in that: The inlet of the alkali preparation tank (1) is located at the top of the alkali preparation tank (1), and the outlet of the alkali preparation tank (1) is located at the bottom of the alkali preparation tank (1).

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