Recycling device for extracting lithium from waste liquid

Abstract

The utility model relates to a waste liquid lithium extraction recycling device which comprises a raw material tank, a lithium extraction tank and a thick slurry tank, and the raw material tank is used for receiving waste liquid from a filter press; a filter bin is arranged in the lithium extraction tank, a filter element is arranged in the filter bin, a first pipeline and a second pipeline are arranged at the two ends of the lithium extraction tank respectively, the first pipeline is communicated with the raw material tank, a water outlet and a first back flushing opening are formed in the second pipeline, and a third pipeline and a fourth pipeline are further arranged on the lithium extraction tank; and the thick slurry tank is communicated with the lithium extraction tank through a third pipeline and is also provided with a discharge port. Compared with a traditional method of directly discharging the waste liquid, the recycling device for extracting lithium from the waste liquid has the advantages that the raw material utilization rate is low, the raw material tank, the lithium extraction tank and the thick slurry tank are arranged, raw materials in the waste liquid can be recycled, the product utilization rate is greatly improved, the whole process is in a totally-closed state, and the risk of introducing foreign matters is avoided.

Description

Technical Field

[0001] The present application relates to the field of lithium materials, and in particular to a waste liquid lithium extraction and recycling device. Background Art

[0002] Positive electrode materials are an important component of lithium-ion battery production. Their production process is complex and involves a wide range of equipment. The wet method is the core process of the production process and the key process for product loss in the entire process. At present, the wet method of positive electrode powder materials usually uses water washing, filter pressing and drying equipment. This equipment can meet certain usage requirements, but it also has defects such as insufficient utilization.

[0003] However, in this process, due to the mismatch of filter cloth pore size, aging, filter element damage, etc., a part of the washed material will be discharged with the waste liquid when passing through the equipment, resulting in material waste. Therefore, it is necessary to develop a new waste liquid lithium extraction recycling equipment to solve the problems existing in the existing device. Utility Model Content

[0004] The embodiment of the present application provides a waste liquid lithium extraction and recycling device to solve the technical problem in the related art that a portion of the washed material will be discharged with the waste liquid when passing through the equipment, resulting in material waste.

[0005] A waste liquid lithium extraction and recycling device is provided, comprising:

[0006] a raw material tank for receiving waste liquid from the filter press;

[0007] A lithium extraction tank, wherein a filter chamber is provided in the lithium extraction tank, a filter element is provided in the filter chamber, a first pipe and a second pipe are respectively provided at both ends of the lithium extraction tank, the first pipe is connected to the raw material tank, a drain port and a first backflush port are provided on the second pipe, and a third pipe and a fourth pipe are also provided on the lithium extraction tank;

[0008] A concentrated slurry tank is connected to the lithium extraction tank through a third pipeline, and a discharge port is also provided on the concentrated slurry tank.

[0009] In some embodiments, the side wall of the lithium extraction tank is provided with a pressure transmitter interface and a vent.

[0010] In some embodiments, a cleaning port is further provided on the second pipe.

[0011] In some embodiments, a filter element is also provided at one end of the fourth pipe facing the lithium extraction tank, and a second backflush port is provided on the side wall of the fourth pipe.

[0012] In some embodiments, a stirring device is provided in the raw material tank.

[0013] In some embodiments, at least two liquid level sensors are disposed in the raw material tank along the height direction.

[0014] In some embodiments, a pump body is disposed on both the first pipeline and the third pipeline.

[0015] The beneficial effects of the technical solution provided by this application include:

[0016] The embodiment of the present application provides a waste liquid lithium extraction and recycling device. Since the waste liquid discharge port of the filter press in the wet system is connected to the raw material tank, and the raw material tank is connected to the lithium extraction tank, the filtered clean water is introduced into the waste liquid discharge pipe, and the raw material attached to the filter element enters the concentrated slurry tank below under the action of backblowing, and then flows back to the wet process upper end equipment through the concentrated slurry tank, and finally flows back to the wet process system. Therefore, there is basically no raw material loss in the whole process, which greatly improves the utilization rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure provided for an embodiment of the present application;

[0019] Figure 2 A process flow chart provided for an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the structure of the lithium extraction tank provided in an embodiment of the present application.

[0021] In the figure: 1, raw material tank; 2, lithium extraction tank; 21, filter chamber; 22, first pipeline; 23, second pipeline; 231, drain port; 232, first backflush port; 233, cleaning port; 24, third pipeline; 25, fourth pipeline; 26, pressure transmitter interface 27, vent port. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] The embodiment of the present application provides a waste liquid lithium extraction and recycling device, which can solve the technical problem in the related art that when the washed material passes through the equipment, a part of the material is discharged with the waste liquid, resulting in material waste.

[0024] In order to solve the above technical problems, the present application provides a waste liquid lithium extraction and recycling device, including a raw material tank 1, a lithium extraction tank 2 and a concentrated slurry tank 3, the raw material tank 1 is used to receive waste liquid from a filter press; the lithium extraction tank 2 is provided with a filter bin 21, the filter bin 3 is provided with a filter element, and the two ends of the lithium extraction tank 2 are respectively provided with a first pipe 22 and a second pipe 23, the first pipe 22 is connected to the raw material tank 1, and the second pipe 23 is provided with a drain port 231 and a first backflush port 232, and the lithium extraction tank 2 is also provided with a third pipe 24 and a fourth pipe 25; the concentrated slurry tank 3 is connected to the lithium extraction tank 2 through the third pipe 24, and the concentrated slurry tank 3 is also provided with a discharge port.

[0025] The present application is arranged on the existing pipeline for discharging waste liquid, and the raw material tank 1 serves as the first receiving container. When the waste liquid inside reaches a certain height, the waste liquid is transferred to the lithium extraction tank 2 through the pump body. The waste liquid lithium extraction tank 2 enters the filter bin 21 from the bottom. The distribution of the pipeline in the filter bin 21 makes it possible for the raw liquid to be discharged only after passing through the filter element. This is the prior art, so no further explanation is given here. After filtration, the clean water is discharged through the drain port 231. The drain port 231 can be transported to the raw material tank 1, or directly transported to the waste liquid discharge pipe, and the raw material is attached to the filter element.

[0026] When the liquid level inside the raw material tank 1 drops to a certain height, the raw material tank 1 can no longer continue to provide waste liquid to the lithium extraction tank 2. Due to lack of power, part of the waste liquid cannot continue to be filtered upward, and it is necessary to discharge this part of the waste liquid first. In this application, it is discharged through the fourth pipe 25. The fourth pipe 25 can also be directly connected to the raw material tank 1 or the waste liquid.

[0027] After all the waste liquid is drained, high-pressure gas is blown out through the first back-blowing port 232, and the raw materials attached to the filter element are blown off by the high-pressure gas. At this time, the valve on the fourth pipeline 25 is closed, and the valve on the third pipeline 24 is opened. The concentrated slurry is discharged into the concentrated slurry tank 3 below, and then transported to the upper end equipment of the wet process, and finally flows back to the wet process system, and then the circulation operation is carried out.

[0028] Compared with the traditional method of directly discharging waste liquid which results in low raw material utilization rate, the present application can recover the raw materials in the waste liquid by setting up a raw material tank 1, a lithium extraction tank 2 and a concentrated slurry tank 3, thereby greatly improving the utilization rate of the product. Moreover, the whole process is in a fully closed state and there is no risk of introducing foreign matter.

[0029] It can be understood that at least two liquid level sensors are arranged along the height direction in the raw material tank 1, generally two are arranged, one is a high liquid level sensor, and the other is a low liquid level sensor, and pump bodies are arranged on the first pipeline 22 and the third pipeline 24. The entire waste liquid lithium extraction and recycling device is controlled by a control system control cabinet. When the high liquid level sensor senses that the liquid level has reached a certain height, the pump body of the first pipeline 22 starts to run, and when the low liquid level sensor senses that the liquid level has dropped to a certain height, the pump body of the first pipeline 22 stops running. Of course, a liquid level transmitter can also be used to facilitate the detection of the upper and lower limits of the liquid level, and to facilitate the control of upstream discharge and downstream raw material recovery.

[0030] The raw material tank 1 is fully sealed to prevent external impurities from entering the interior and causing material contamination. A breathing cap is provided on the top to balance the air pressure in the tank. A stirring device is provided in the raw material tank 1 to prevent the raw materials from settling and being inconvenient to discharge.

[0031] Furthermore, the side wall of the lithium extraction tank 2 is provided with a pressure transmitter interface 26 and a vent 27. Since it is necessary to pressurize the lithium extraction tank 2 to facilitate the discharge of raw materials, the pressure transmitter interface 26 is required to facilitate the instrument to measure the internal pressure, and the vent 27 is used to release the pressure inside the lithium extraction tank 2.

[0032] After the filter element has been used for a long time, even if backflushing is performed, some substances will remain to block the filter element, reducing the filtering effect. Therefore, in the present application, a cleaning port 233 is also provided on the second pipe 23, and the filter element can be cleaned by injecting clean water, and the cleaned water can be discharged through the fourth pipe 25.

[0033] Furthermore, a filter element is also provided at one end of the fourth pipe 25 facing the lithium extraction tank 2 , and a second back-blowing port is provided on the side wall of the fourth pipe 25 .

[0034] This filter element is also located in a pipeline, one end of which is connected to the lithium extraction tank 2, and the other end is connected to the fourth pipeline 25. Before discharging the concentrated slurry, the waste liquid in the lithium extraction tank 2 needs to be discharged first. Since these waste liquids have not been filtered, in order to reduce the waste of raw materials, a filter element is also provided at the fourth pipeline 25. Of course, when discharging the concentrated slurry, the second back-blow port will work together with the first back-blow port 233 to blow off the raw materials on the filter element. Then a flushing port can also be provided at the fourth pipeline 25 to regularly clean the filter element here to ensure the filtering capacity of the filter element.

[0035] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0036] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A waste liquid lithium extraction recycling device, characterized in that: include: A raw material tank (1) for receiving waste liquid from the filter press; A lithium extraction tank (2), wherein a filter chamber (21) is provided in the lithium extraction tank (2), a filter element is provided in the filter chamber (21), a first pipe (22) and a second pipe (23) are provided at both ends of the lithium extraction tank (2), the first pipe (22) is connected to the raw material tank (1), a drain port (231) and a first backflush port (232) are provided on the second pipe (23), and a third pipe (24) and a fourth pipe (25) are also provided on the lithium extraction tank (2); A concentrated slurry tank (3), the concentrated slurry tank (3) is connected to the lithium extraction tank (2) through a third pipeline (24), and the concentrated slurry tank (3) is also provided with a discharge port.

2. The waste liquid lithium extraction recycling device according to claim 1, characterized in that: The side wall of the lithium extraction tank (2) is provided with a pressure transmitter interface (26) and a vent (27).

3. The waste liquid lithium extraction recycling device according to claim 1, characterized in that: The second pipe (23) is also provided with a cleaning port (233).

4. The waste liquid lithium extraction recycling device according to claim 1, characterized in that: A filter element is also provided at one end of the fourth pipe (25) facing the lithium extraction tank (2), and a second back-blowing port is provided on the side wall of the fourth pipe (25).

5. The waste liquid lithium extraction recycling device according to claim 1, characterized in that: The raw material tank (1) is provided with a stirring device.

6. The waste liquid lithium extraction recycling device according to claim 1, characterized in that: At least two liquid level sensors are arranged in the raw material tank (1) along the height direction.

7. The waste liquid lithium extraction recycling device according to claim 1, characterized in that: A pump body is provided on both the first pipeline (22) and the third pipeline (24).

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