Impurity removal system for lithium salt production

Abstract

The utility model relates to the technical field of lithium salt impurity removal, and aims to solve the problems that the existing lithium salt impurity removal device is large in filtering and separating burden every time, and a pipeline is easy to block. The utility model provides an impurity removal system for lithium salt production. The impurity removal system comprises a reaction kettle, a filtering device and a pH (Potential of Hydrogen) detection device, the pH detection device is communicated with the bottom of the reaction kettle; the reaction kettle comprises a plurality of feeding pipes and liquid discharging pipes; the liquid discharge pipe is communicated with the liquid inlet end of the filtering device through a liquid pump; the liquid outlet end of the filtering device is communicated with the feeding pipe through a circulating pump; according to the utility model, by carrying out multi-range precipitation, the burden of filtering each time is reduced, and the condition of pipeline blockage is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium salt impurity removal, and particularly relates to an impurity removal system for lithium salt production. Background Art

[0002] In the lithium salt production process, it is usually necessary to acid-leach the roasted raw materials, and then precipitate and remove impurities by adjusting the pH value. For example, the patent with the publication number CN205773393U discloses a system for producing lithium salts by the sulfuric acid method. Specifically, it acid-leaches the roasted lithium ore with sulfuric acid in an acid-leaching device to obtain a lithium leaching solution, and then transfers the leaching solution to an impurity removal device for pH value adjustment. The impurities are precipitated and separated from the leaching solution by adjusting the pH value. The leaching solution after impurity removal is filtered and then further separated by passing through a membrane filtration device or the like.

[0003] In lithium salt production, the pH value is usually adjusted twice, namely pH6-7 and pH11-12 respectively. However, using two pH value adjustments has a large burden on cleaning the filter residue for each precipitation, and it is extremely easy to cause scaling on the inner wall of the impurity removal device and difficult to clean, as well as easy to cause blockage of the pipeline.

[0004] Based on the above description, there is an urgent need for a system that can improve the filtration efficiency and avoid pipeline blockage. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an impurity removal system for lithium salt production, aiming to solve the technical problems of the existing lithium salt impurity removal device, which has a large burden on each filtration and separation and is easy to cause pipeline blockage.

[0006] The embodiments of the utility model are realized by the following technical solutions:

[0007] An impurity removal system for lithium salt production includes a reaction kettle, a filtration device and a pH detection device; the pH detection device is communicated with the bottom of the reaction kettle; the reaction kettle includes a plurality of feed pipes and a drain pipe; the drain pipe is communicated with the liquid inlet end of the filtration device through a liquid extraction pump; the liquid outlet end of the filtration device is communicated with the feed pipe through a circulation pump.

[0008] Preferably, the pH detection device includes a pH detector, a liquid immersion box, a liquid extraction component and a flushing component; the liquid immersion box is erected on one side of the reaction kettle; the pH detector penetrates through the top of the liquid immersion box; the liquid immersion box is communicated with the reaction kettle through the liquid extraction component; the flushing component is communicated with the liquid immersion box.

[0009] Preferably, the liquid extraction component includes a filtration box and a liquid extraction part; the filtration box is arranged inside the reaction kettle; the filtration box is communicated with the liquid immersion box through the liquid extraction part.

[0010] Preferably, the flushing assembly includes a water inlet pipe and a water extraction pipe; both the water inlet pipe and the water extraction pipe are communicated with the immersion liquid box.

[0011] Preferably, the pH detector includes a detection head; a diversion bottom plate is arranged in the immersion liquid box; the detection head penetrates into the immersion liquid box and extends towards the high end of the diversion bottom plate; one end of the liquid extraction member penetrates through the diversion bottom plate and extends towards the detection head.

[0012] Preferably, the filtering device includes a box body, a filter basket, a liquid inlet pipe and a liquid outlet pipe; the filter basket is arranged at one end of the box body; the liquid inlet pipe is communicated with the filter basket; the liquid outlet pipe is communicated between the filter basket and the inner side wall of the box body.

[0013] Preferably, a pair of limiting plates are arranged in the box body; the filter basket is abutted against one end of the box body close to the liquid inlet pipe through the pair of limiting plates.

[0014] Preferably, a plurality of filter holes are arranged at one end of the filter basket far from the liquid inlet pipe; the liquid outlet pipe penetrates into the box body and extends towards the filter holes.

[0015] The technical solution of the embodiment of the present utility model has at least the following advantages and beneficial effects:

[0016] The present utility model conducts on-line detection of the impurity removal liquid in the reaction kettle through the pH detection device, so as to facilitate accurate multiple pH value adjustments of the impurity removal liquid in the reaction kettle, thereby separating the impurities in the impurity removal liquid into multiple precipitations, reducing the pressure of each filtration and separation, and slowing down the scaling of the inner wall of the reaction kettle; after each pH value adjustment, the settled impurity removal liquid is pumped into the filtering device by a liquid extraction pump for filtration, and after filtration, it is put back into the reaction kettle again. By adjusting the pH value again, secondary precipitation is carried out, and then it is pumped into the filtering device by the liquid extraction pump for filtration, and after filtration, it is put back into the reaction kettle again, and so on, to carry out precipitation in a wide range, reducing the burden of each filtration and slowing down the situation of pipeline blockage; finally, the filtrate meeting the qualified standard is discharged through a separately provided liquid discharge pipe for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a system schematic diagram of the present utility model;

[0019] Figure 2 isFigure 1 Enlarged schematic diagram of the local structure A;

[0020] Figure 3 Structural schematic diagram of the filtration device in the present utility model.

[0021] Icon: 1 - reactor, 2 - filtration device, 21 - box body, 22 - filter basket, 23 - liquid inlet pipe, 24 - liquid outlet pipe, 3 - pH detection device, 31 - pH detector, 32 - immersion liquid box, 33 - liquid pumping assembly, 34 - flushing assembly, 341 - water inlet pipe, 342 - water pumping pipe, 4 - liquid pumping pump, 5 - circulation pump, 6 - diversion bottom plate, 7 - limiting plate. Specific implementation mode

[0022] Embodiment 1

[0023] Please refer to Figures 1 to 3 , the present utility model provides the following technical solutions: A lithium salt production impurity removal system, applicable to the situation of fully removing impurities from the leaching solution after acid leaching.

[0024] Specifically, as Figure 1 and Figure 2 shown, a lithium salt production impurity removal system includes a reactor 1, a filtration device 2 and a pH detection device 3; the pH detection device 3 is connected to the bottom of the reactor 1; the reactor 1 includes multiple feed pipes and drain pipes; the drain pipe is connected to the liquid inlet end of the filtration device 2 through a liquid pumping pump 4; the liquid outlet end of the filtration device 2 is connected to the feed pipe through a circulation pump 5.

[0025] In this embodiment, the pH detection device 3 is used to perform on-line detection of the impurity removal liquid in the reactor 1, so as to facilitate accurate adjustment of the pH value of the impurity removal liquid in the reactor 1 multiple times, so that the impurities in the impurity removal liquid are precipitated multiple times, reducing the pressure of each filtration separation and slowing down the scaling of the inner wall of the reactor 1; after each pH value adjustment, the settled impurity removal liquid is pumped into the filtration device 2 through the liquid pumping pump 4 for filtration, and after filtration, it is put into the reactor 1 again. By adjusting the pH value again, secondary precipitation is carried out, and then it is pumped into the filtration device 2 through the liquid pumping pump 4 for filtration, and after filtration, it is put into the reactor 1 again, and so on, for precipitation in multiple ranges, reducing the burden of each filtration and slowing down the situation of pipeline blockage; finally, the filtrate that meets the qualified standard is discharged through a separately provided drain pipe for use.

[0026] In this embodiment, the pH detection device 3 is arranged below the lowest liquid level of the reactor. To ensure the accuracy of pH value detection as much as possible, a stirrer can be further arranged in the reactor 1 for stirring.

[0027] Specifically, as Figure 1 and Figure 2As shown in the figure, the pH detection device 3 includes a pH detector 31, a liquid immersion box 32, a liquid pumping assembly 33 and a flushing assembly 34; the liquid immersion box 32 is mounted on one side of the reaction kettle 1; the pH detector 31 penetrates through the top of the liquid immersion box 32; the liquid immersion box 32 is communicated with the reaction kettle 1 through the liquid pumping assembly 33; the flushing assembly 34 is communicated with the liquid immersion box 32. The liquid pumping assembly 33 includes a filter box and a liquid pumping member; the filter box is arranged inside the reaction kettle 1; the filter box is communicated with the liquid immersion box 32 through the liquid pumping member. The flushing assembly 34 includes a water inlet pipe 341 and a water pumping pipe 342; both the water inlet pipe 341 and the water pumping pipe 342 are communicated with the liquid immersion box 32. The pH detector 31 includes a detection head; a diversion bottom plate 6 is arranged inside the liquid immersion box 32; the detection head penetrates into the liquid immersion box 32 and extends towards the high end of the diversion bottom plate 6; one end of the liquid pumping member penetrates through the diversion bottom plate 6 and extends towards the detection head.

[0028] In this embodiment, the filter box can ensure that the liquid pumped into the liquid immersion box 32 is filtered, avoiding blocking the liquid pumping member (including the liquid pumping pipe, the liquid pumping pump and the drain pipe). The liquid in the reaction kettle 1 is pumped into the drain pipe through the liquid pumping pipe and the liquid pumping pump and then introduced into the liquid immersion box 32 to soak and detect the detection head of the pH detector 31. After detection, the cleaning water is pumped into the liquid immersion box 32 again through another liquid pumping pump to soak and flush the liquid immersion box 32 and the detection head, and the cleaning water is pumped out again through the water pumping pipe 342.

[0029] Specifically, as Figure 1 and Figure 3 shown in the figure, the filtering device 2 includes a box body 21, a filter basket 22, a liquid inlet pipe 23 and a liquid outlet pipe 24; the filter basket 22 is arranged inside one end of the box body 21; the liquid inlet pipe 23 is communicated with the filter basket 22; the liquid outlet pipe 24 is communicated between the filter basket 22 and the inner side wall of the box body 21. A pair of limiting plates 7 are arranged inside the box body 21; the filter basket 22 is abutted against one end of the box body 21 close to the liquid inlet pipe 23 through the pair of limiting plates 7. A plurality of filter holes are arranged at one end of the filter basket 22 far from the liquid inlet pipe 23; the liquid outlet pipe 24 penetrates into the box body 21 and extends towards the filter holes.

[0030] In this embodiment, the filter basket 22 is arranged inside one side of the box body 21, so as to filter the feed liquid introduced through the liquid inlet pipe 23. The filtered filtrate flows into the other side of the box body 21 from the filter holes and is further discharged through the liquid outlet pipe 24. Among them, the filter basket 22 is limited and fixed through a pair of limiting plates 7, so as to ensure the stability of the filter basket 22 during filtration.

[0031] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium salt production impurity removal system, comprising a reaction kettle (1), characterized in that: It further includes a filtering device (2) and a pH detection device (3); the pH detection device (3) is communicated with the bottom of the reaction kettle (1); the reaction kettle (1) includes a plurality of feed pipes and a drain pipe; the drain pipe is communicated with the liquid inlet end of the filtering device (2) through a liquid extraction pump (4); the liquid outlet end of the filtering device (2) is communicated with the feed pipe through a circulation pump (5); the pH detection device (3) includes a pH detector (31), a liquid immersion box (32), a liquid extraction component (33) and a flushing component (34); the liquid immersion box (32) is erected on one side of the reaction kettle (1); the pH detector (31) penetrates through the top of the liquid immersion box (32); the liquid immersion box (32) is communicated with the reaction kettle (1) through the liquid extraction component (33); the flushing component (34) is communicated with the liquid immersion box (32).

2. The impurity removal system for lithium salt production according to claim 1, characterized in that: The liquid extraction component (33) includes a filtering box and a liquid extraction part; the filtering box is arranged inside the reaction kettle (1); the filtering box is communicated with the liquid immersion box (32) through the liquid extraction part.

3. The impurity removal system for lithium salt production according to claim 2, wherein: The flushing component (34) includes a water inlet pipe (341) and a water extraction pipe (342); both the water inlet pipe (341) and the water extraction pipe (342) are communicated with the liquid immersion box (32).

4. The impurity removal system for lithium salt production according to claim 3, wherein: The pH detector (31) includes a detection head; a diversion bottom plate (6) is arranged inside the liquid immersion box (32); the detection head penetrates into the liquid immersion box (32) and extends towards the high end of the diversion bottom plate (6); one end of the liquid extraction part penetrates through the diversion bottom plate (6) and extends towards the detection head.

5. The impurity removal system for lithium salt production according to claim 1 or 2, characterized in that: The filtering device (2) includes a box body (21), a filter basket (22), a liquid inlet pipe (23) and a liquid outlet pipe (24); the filter basket (22) is arranged inside one end of the box body (21); the liquid inlet pipe (23) is communicated with the filter basket (22); the liquid outlet pipe (24) is communicated between the filter basket (22) and the inner side wall of the box body (21).

6. The impurity removal system for lithium salt production according to claim 5, wherein: A pair of limiting plates (7) are arranged inside the box body (21); the filter basket (22) is abutted against one end of the box body (21) close to the liquid inlet pipe (23) through the pair of limiting plates (7).

7. The impurity removal system for lithium salt production according to claim 6, characterized in that: A plurality of filter holes are arranged at one end of the filter basket (22) far from the liquid inlet pipe (23); the liquid outlet pipe (24) penetrates into the box body (21) and extends towards the filter holes.

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