PH detection device for purification liquid for lithium carbonate preparation
By using a cooler and a liquid sampler in the preparation process of the purified liquid, the problem of unstable operating temperature of the pH meter was solved, achieving stable detection and long life of the pH meter, and improving the precise control capability of the production process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-03-27
AI Technical Summary
The pH meter in the existing purification vessel has an unstable operating temperature, resulting in low detection accuracy and short service life. Manual detection is prone to errors, affecting production quality and cost.
A cooler is used to cool the purified liquid to a suitable operating temperature for the pH meter, and the pH meter electrode is always immersed in the liquid through the liquid collection sampler design. Combined with an automated control system, the stability and accuracy of the pH meter are ensured.
This improves the accuracy and lifespan of pH meters, reduces maintenance and replacement costs, and ensures the stability of the production process and the consistency of product quality.
Smart Images
Figure CN224052074U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to carbonic acid lithium preparation process to the purified liquid PH detection technical field, concretely refers to a kind of purified liquid PH detection device for carbonic acid lithium preparation. BACKGROUND
[0002] In the production of lithium carbonate prepared by spodumene, qualified leaching solution is produced after spodumene ore is calcined, acidified, water immersed and separated. Since the leaching solution contains Mg 2+ And Ca 2+ Harmful impurities, the leaching solution needs to be impurity-removed to ensure the requirements of subsequent processes.
[0003] The existing impurity-removing method of leaching solution is to add leaching solution of a specified volume into a purification kettle. The purification kettle first heats and warms the leaching solution to a specified temperature, then adds liquid alkali to react with Mg 2+ And Ca 2+ To precipitate, so that the PH value of the leaching solution is gradually adjusted to the required value to form purified liquid. At this time, the PH value of the purified liquid needs to be tracked and detected to control the amount of liquid alkali added, so that the PH value reaches the specified value, and the impurities can be completely precipitated.
[0004] However, the existing purification kettle usually inserts a PH meter on the top cover. When the leaching solution is heated, it usually needs to be heated to about 90°. The optimal working temperature of the PH meter is generally 60℃. When the purification kettle is periodically opened for feeding and discharging, the working temperature of the PH meter fluctuates between 40℃ and 90℃. The detection temperature is unstable. When feeding, the electrode of the PH meter can contact the process liquid. When discharging, the electrode contacts the air, so the electrode is in a periodic dry-wet cycle. This causes the PH meter to fail quickly and cannot be used continuously. During maintenance and replacement, the PH value can only be detected manually using PH test paper. However, each operator may have deviations when identifying the color difference of the test paper with the naked eye. Therefore, the quality of the purified liquid produced by each kettle and each shift is uneven, which affects the consumption of liquid alkali. The actual accuracy may not reach the nominal value, which has a potential impact on the normal operation of the subsequent section and the product quality. Therefore, there is an urgent need for a stable PH detection device to solve the above problems. INVENTION CONTENTS
[0005] The utility model provides a purified liquid PH detection device for carbonic acid lithium preparation to overcome the deficiencies of the prior art, meet the normal operation process conditions of the PH meter, and enable the PH meter to detect stably. This realizes precise guidance and control of the production process and reduces the uncontrollable impact of human factors on the production process.
[0006] The utility model discloses a kind of purification liquid PH detection devices for lithium carbonate preparation, including purification kettle and PH meter, further including cooler and liquid collector sampler, the liquid collector sampler includes the sampling tube of vertical extension, inlet and outlet are equipped on sampling tube, the PH meter is fixed in sampling tube top, and the electrode of PH meter extends into sampling tube inside, the purification liquid outlet of purification kettle and the solution input of cooler are communicated, and the solution output of cooler is communicated with the inlet of liquid collector sampler.
[0007] The present scheme uses the purified liquid after impurity removal in the purification kettle to enter the cooler for cooling, and the cooled purified liquid is then sampled in the sampling tube for detection, and the PH value of the purified liquid is detected in real time by the PH meter to ensure that the PH value reaches the specified value. Since the purified liquid is cooled by the cooler from the initial temperature of 90℃ to 60℃, it is more suitable for the working temperature of the PH meter, thereby ensuring the stability of the detection temperature of the PH meter, improving the detection accuracy, and prolonging the service life of the PH meter while reducing the maintenance and replacement costs.
[0008] As an optimization, the outlet of the liquid collector sampler is communicated with a collection tank. This optimization scheme collects the purified liquid discharged from the liquid collector sampler through the collection tank to avoid waste.
[0009] As an optimization, the inlet is located at the lower part of the side wall of the sampling tube, the outlet is located at the upper part of the side wall of the sampling tube, and the electrode of the PH meter extends to a position below the outlet. In this optimization scheme, since the height of the inlet is lower than that of the outlet, the purified liquid gradually fills the sampling tube from bottom to top and is then discharged, and by setting the electrode of the PH meter below the outlet, the electrode can always be in the purified liquid, thereby avoiding the periodic contact of the electrode with air and process liquid, and the electrode can always be in a wet state, thereby further improving the service life of the PH meter.
[0010] As an optimization, the cooler is a tube-shell heat exchanger. In this optimization scheme, the tube-shell heat exchanger generally uses cold air or cold water for heat exchange and cooling, which is low in use cost and good in cooling effect.
[0011] As an optimization, the solution input of the cooler is also communicated with a flushing pipeline. In this optimization scheme, the flushing pipeline is used to introduce cleaning water to periodically clean the cooler and the liquid collector sampler, prevent scaling of the cooler, the liquid collector sampler, and the electrode of the PH meter, and further prolong the service life of the electrode of the PH meter.
[0012] As an optimization, a first flange is fixed to the upper end of the sampling tube, and the PH meter is fixed by screwing the second flange with the first flange. In this optimization scheme, the PH meter and the sampling tube are fixed by flanges, which is convenient for disassembly and has good sealing performance.
[0013] The utility model discloses beneficial effect is: after the cooling liquid cooling to reenter the sampling of liquid collector, makes the temperature of the purification liquid more suitable for the working temperature of PH meter, thereby guarantee the stability of PH meter detection temperature, improve the detection accuracy and make PH meter have longer service life, reduce the use maintenance replacement cost.
[0014] The height of the liquid inlet of the liquid collector is lower than the height of the liquid outlet, the purification liquid gradually fills the sampling tube from bottom to top and then is discharged, by setting the electrode of the PH meter below the liquid outlet, the electrode can be always in the purification liquid, thereby avoiding the periodic contact of the electrode with air and process liquid, the electrode can be always in the wet state, thereby further improving the service life of the PH meter.
[0015] By the flushing pipeline into the cleaning water, the cooler and the liquid collector can be cleaned regularly, preventing the cooler, the liquid collector and the electrode of the PH meter from scaling, and further improving the service life of the electrode of the PH meter. BRIEF DESCRIPTION OF DRAWINGS
[0016] Fig. 1 It is flow process schematic diagram schematic diagram for the utility model.
[0017] Fig. 2 It is liquid collector sectional view.
[0018] The shown in the figure:
[0019] 1, purification kettle, 11, leaching liquid inlet, 12, liquid alkali feeding port, 13, liquid level sensor, 14, temperature sensor, 15, purification liquid outlet, 2, first pipeline, 3, flushing pipeline, 4, cooler, 41, cooling medium inlet, 42, cooling medium outlet, 43, solution input port, 44, solution output port, 5, second pipeline, 6, liquid collector, 61, liquid inlet, 62, liquid outlet, 63, sampling tube, 64, first flange, 65, second flange, 7, PH meter, 8, collection tank, 9, electric control valve. DETAILED DESCRIPTION
[0020] In order to clearly illustrate the technical features of the scheme, the following through specific implementation, the scheme is described.
[0021] For example, Figs. 1-2As shown, a kind of purified liquid PH detection device for lithium carbonate preparation, including purification kettle 1 and PH meter 7, also including cooler 4 and liquid collector sampler 6, the liquid collector sampler 6 includes the sampling tube 63 extending vertically, sampling tube 63 is equipped with liquid inlet 61 and liquid outlet 62, the PH meter 7 is fixed on the top of sampling tube 63, and the electrode of PH meter 7 extends into sampling tube 63, the purified liquid outlet 15 of the purification kettle 1 and the solution input port 43 of cooler 4 are communicated, and the solution output port 44 of cooler 4 is communicated with the liquid inlet 61 of liquid collector sampler 6.
[0022] The purified liquid removed by purification kettle 1 enters cooler 4 to cool, and the cooled purified liquid enters liquid collector sampler 6 to sample and detect, and the PH value of the purified liquid is detected in real time by PH meter 7 to ensure that the PH value reaches the specified value. Since the purified liquid is cooled by cooler 4 from the initial temperature of 90 DEG C to 60 DEG C, it is more suitable for the working temperature of the PH meter, thereby ensuring the stability of the detection temperature of the PH meter, improving the detection accuracy, and prolonging the service life of the PH meter and reducing the maintenance and replacement cost.
[0023] Specifically, the purification kettle 1 is provided with a leaching liquid inlet 11, a purified liquid outlet 15 and a liquid alkali feeding port 12, and an electric heater, a temperature sensor 14 and a liquid level sensor 13 are further arranged in the purification kettle 1. The leaching liquid is introduced into the purification kettle 1 through the leaching liquid inlet 11, the electric heater is used to heat the leaching liquid, the temperature sensor 14 is used to sense the heating temperature, the liquid level sensor 13 is used to sense the liquid level of the leaching liquid, and the liquid alkali is added to the leaching liquid through the liquid alkali feeding port 12, so that the leaching liquid is removed and purified into purified liquid, which is discharged from the purified liquid outlet 15. This is the prior art.
[0024] Specifically, the cooler 4 is a tube-shell heat exchanger, which is provided with the solution input port 43 and the solution output port 44, and further provided with a cooling medium inlet 41 and a cooling medium outlet 42. The cooling medium is introduced into the tube-shell heat exchanger through the cooling medium inlet 41, and the cooling medium can be cold air or cooling water.
[0025] The purified liquid is introduced into the tube-shell heat exchanger through the solution input port 43, and is discharged from the solution output port after heat exchange and cooling with the cooling medium. The purified liquid outlet 15 of the present embodiment is communicated with the solution input port 43 through the first pipe 2.
[0026] Preferably, the solution input port 43 of the cooler 4 is further communicated with a flushing pipe 3 connected with a water source. The end of the first pipe 2 away from the purified liquid outlet 15, the flushing pipe 3 and the solution input port 43 are connected through a tee joint. The flushing pipe 3 is used to introduce cleaning water to periodically clean the cooler 4 and the liquid collector sampler 6, so as to prevent the electrodes of the cooler 4, the liquid collector sampler 6 and the PH meter 7 from being scaled, and further prolong the service life of the electrodes of the PH meter.
[0027] Specifically, the sampling tube 63 is open at the top and closed at the bottom. The inlet 61 is located at the lower part of the side wall of the sampling tube 63, and the outlet 62 is located at the upper part of the side wall of the sampling tube 63. The electrode of the pH meter 7 extends below the outlet 62, that is, the horizontal height of the pH meter 7 electrode is lower than the horizontal height of the outlet 62. In this embodiment, the solution outlet 44 of the cooler 4 is connected to the inlet 61 of the liquid collector 6 through the second pipe 5.
[0028] Because the height of the inlet 61 is lower than the height of the outlet 62, the purified liquid discharged from the cooler 4 gradually fills the sampling tube 63 from bottom to top before being discharged. Since the height of the pH meter electrode 7 is lower than the height of the outlet 62, the electrode remains immersed in the purified liquid during discharge, ensuring it remains moist and thus further extending the pH meter's lifespan.
[0029] Preferably, a first flange 64 is fixedly connected to the upper end of the sampling tube 63, and the pH meter 7 is screwed to the first flange 64 via a second flange 65. The pH meter 7 and the sampling tube 63 are fixedly connected by flanges, which facilitates disassembly and assembly and provides good sealing performance.
[0030] Preferably, the drain port 62 of the liquid sampler 6 is connected to a collection tank 8. This optimized solution collects the purified liquid discharged from the liquid sampler 6 through the collection tank 8, avoiding waste.
[0031] This embodiment also includes a central controller. Electrically controlled valves 9 are installed on the liquid alkali feed port 12, purified liquid outlet 15, flushing pipeline 3, cooling medium inlet 41, cooling medium outlet 42, solution outlet 44, and drain port 62. Each electrically controlled valve 9, electric heater, temperature sensor 14, liquid level sensor 13, and pH meter 7 is electrically connected to the central controller. The central controller centrally processes the signals from each circuit, achieving automated control of the device and making it convenient to use.
[0032] Working principle: Leaching solution is added to purification vessel 1. When the level sensor 13 detects that the required level has been reached, the central controller sends a command to heat the leaching solution with an electric heater. When the temperature sensor 14 detects that the leaching solution has reached 90°C, the central controller sends a command to open the solenoid valve 9 of the alkali feed port 12, adding alkali to purify the leaching solution. After 10 minutes, the central controller sends a command to open the solenoid valve 9 of the purified solution outlet 15, allowing the purified solution to enter the cooler 4 and exchange heat with the cooling medium to cool down to 60°C. The cooled purified solution enters the liquid collector 6, and the central controller sends a command to control the pH meter 7 for online detection. If the pH reading does not meet the requirements, the central controller sends a command to continue adding alkali until the final pH value meets the process requirements. The program then sends a command to close the solenoid valve 9 of the alkali feed port 12.
[0033] After a certain time of use, the device can be cleaned to avoid fouling. When cleaning, the central controller sends a command to close the electrically controlled valve 9 of the purification liquid outlet 15, and simultaneously opens the electrically controlled valve 9 of the flushing pipeline 3, so that the flushing water flows through the cooler 4 and the sampling tube 63 in turn, thereby flushing the cooler 4, the sampling tube 63 and the pH meter 7.
[0034] Of course, the above description is not limited to the above examples, and the technical features not described in the utility model can be realized by or using the prior art, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the utility model and are not a limitation on the utility model. The utility model has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the utility model do not deviate from the purpose of the utility model, and should also belong to the protection scope of the claims of the utility model.
Claims
1. A pH detection device for a purification solution used in lithium carbonate preparation, comprising a purification vessel (1) and a pH meter (7), characterized in that: It also includes a cooler (4) and a liquid sampler (6). The liquid sampler (6) includes a vertically extending sampling tube (63). The sampling tube (63) is provided with an inlet (61) and a outlet (62). The pH meter (7) is fixed to the top of the sampling tube (63), and the electrode of the pH meter (7) extends into the sampling tube (63). The purified liquid outlet (15) of the purification vessel (1) is connected to the solution inlet (43) of the cooler (4), and the solution outlet (44) of the cooler (4) is connected to the inlet (61) of the liquid sampler (6).
2. The pH detection device for the purified solution in lithium carbonate preparation according to claim 1, characterized in that: The drain port (62) of the liquid sampler (6) is connected to the collection tank (8).
3. The pH detection device for the purified solution in lithium carbonate preparation according to claim 1, characterized in that: The inlet (61) is located at the lower part of the side wall of the sampling tube (63), the outlet (62) is located at the upper part of the side wall of the sampling tube (63), and the electrode of the pH meter (7) extends to a position below the outlet (62).
4. The pH detection device for the purified solution in lithium carbonate preparation according to claim 1, characterized in that: The cooler (4) is a shell-and-tube heat exchanger.
5. The pH detection device for the purified solution in lithium carbonate preparation according to claim 1, characterized in that: The solution inlet (43) of the cooler (4) is also connected to a flushing pipe (3).
6. The pH detection device for the purified solution in lithium carbonate preparation according to claim 1, characterized in that: The upper end of the sampling tube (63) is fixedly connected to a first flange (64), and the pH meter (7) is screwed to the first flange (64) through a second flange (65).