Battery recovery system

Abstract

The invention discloses a battery recovery system, relates to the technical field of battery recovery, and discloses a battery recovery system which comprises a black powder nickel-magnesium extraction line and a cobalt intermediate product magnesium extraction line, the cobalt intermediate product magnesium extraction line comprises a first multi-stage extraction unit, a first washing and clarifying unit, a first washing unit, a first reverse extraction and clarifying unit and a first multi-stage reverse extraction unit which are connected in sequence, and the first washing and clarifying unit is connected with the black powder nickel-magnesium extraction line; the first washing and clarifying unit is used for taking washing and clarifying liquid generated in the first washing and clarifying unit as nickel and magnesium extraction pre-liquid of a black powder nickel and magnesium extraction line; the first reverse extraction clarification unit is connected with the black powder nickel-magnesium extraction line, and is used for taking magnesium reverse clarification liquid generated in the first reverse extraction clarification unit as nickel-magnesium extraction pre-liquid of the black powder nickel-magnesium extraction line. According to the invention, the resource waste in the extraction production line in the battery recovery process is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery recycling, and in particular to a battery recycling system. Background Art

[0002] In the current field of battery metal resource recycling, especially in the treatment of waste batteries, extraction technology, as one of the key links, plays an important role in achieving the effective separation and recovery of valuable metals such as nickel, cobalt, manganese, magnesium, etc.

[0003] Generally speaking, the raffinate and stripping liquor produced by the previous line usually flow directly into the next process as raw materials or are directly stored as finished products. However, if the previous steps fail to effectively extract the valuable metals they target, it may affect the extraction efficiency of the subsequent extraction production line and lead to waste of metal resources. Summary of the Invention

[0004] The main purpose of this application is to provide a battery recycling system that effectively reduces resource waste in the extraction production line during the battery recycling process.

[0005] To achieve the above objectives, an embodiment of the present application provides a battery recycling system, the system comprising:

[0006] Black powder extracted nickel-magnesium wire;

[0007] A cobalt intermediate product magnesium extraction line, comprising: a first multi-stage extraction unit, a first washing and clarification unit, a first washing unit, a first stripping and clarification unit, and a first multi-stage stripping unit connected in sequence;

[0008] The first washing and clarifying unit is connected to the black powder nickel-magnesium extraction line, and is used to use the washing and clarifying liquid produced in the first washing and clarifying unit as the nickel-magnesium extraction pre-liquid of the black powder nickel-magnesium extraction line;

[0009] The first stripping and clarification unit is connected to the black powder nickel-magnesium extraction line and is used to use the stripping and clarification liquid produced in the first stripping and clarification unit as the nickel-magnesium extraction precursor liquid of the black powder nickel-magnesium extraction line.

[0010] In one embodiment, the system further comprises: an open circuit fluid storage tank;

[0011] The first stripping and clarification unit is connected to the open circuit liquid storage tank via a first valve;

[0012] When the cobalt content in the de-magnesium clarified liquid is greater than a first cobalt content threshold, the first valve is opened.

[0013] In one embodiment, the first stripping and clarification unit is connected to the black powder extraction nickel-magnesium line via a second valve;

[0014] When the nickel content in the de-magnesium clarified liquid is greater than a first nickel content threshold and the cobalt content is less than or equal to the first cobalt content threshold, the second valve is opened.

[0015] In one embodiment, the cobalt intermediate product magnesium extraction line further includes: a magnesium stripping liquid storage tank connected to the first multi-stage stripping unit.

[0016] In one embodiment, the first stripping and clarification unit is connected to the magnesium stripping liquid storage tank via a third valve;

[0017] When the nickel content in the de-magnesium clarified liquid is less than the second nickel content threshold value, and the cobalt content is less than or equal to the first cobalt content threshold value, opening the third valve;

[0018] The first nickel content threshold is greater than the second nickel content threshold.

[0019] In one embodiment, the black powder extracted nickel-magnesium wire includes: a second multi-stage stripping unit, and the second multi-stage stripping unit is connected to the open circuit liquid storage tank.

[0020] In one embodiment, the system further comprises:

[0021] A cobalt intermediate product manganese extraction line, wherein the open-circuit liquid storage tank is connected to the cobalt intermediate product manganese extraction line, and the open-circuit liquid in the open-circuit liquid storage tank will serve as the manganese extraction pre-liquid of the cobalt intermediate product manganese extraction line;

[0022] The cobalt intermediate product cobalt extraction line and the cobalt intermediate product manganese extraction line, the manganese extraction residual liquid of the cobalt intermediate product manganese extraction line will be used as the cobalt extraction precursor liquid of the cobalt intermediate product cobalt extraction line.

[0023] In one embodiment, the cobalt intermediate product cobalt extraction line is connected to the cobalt intermediate product magnesium extraction line, and the cobalt extraction residual liquid of the cobalt intermediate product cobalt extraction line will serve as the magnesium extraction precursor liquid of the cobalt intermediate product magnesium extraction line.

[0024] In one embodiment, the cobalt intermediate magnesium extraction line further includes a first saponification unit and a first raffinate clarification unit;

[0025] The first saponification unit is connected to the first raffinate clarification unit;

[0026] The first raffinate clarification unit is connected to the first multi-stage extraction unit.

[0027] In one embodiment, the black powder extracted nickel-magnesium line comprises: a second multi-stage extraction unit, a second washing and clarifying unit, a second washing unit, a second stripping and clarifying unit, and a second multi-stage stripping unit connected in sequence.

[0028] An embodiment of the present application provides a battery recycling system, comprising a black powder nickel-magnesium extraction line and a cobalt intermediate product magnesium extraction line, and the cobalt intermediate product magnesium extraction line further comprises: a first multi-stage extraction unit, a first washing and clarification unit, a first washing unit, a first stripping and clarification unit, and a first multi-stage stripping unit connected in sequence, wherein the first washing and clarification unit is connected to the black powder nickel-magnesium extraction line, so that the washing and clarification liquid produced in the first washing and clarification unit can be used as a nickel-magnesium extraction precursor liquid for the black powder nickel-magnesium extraction line; the first stripping and clarification unit is connected to the black powder nickel-magnesium extraction line, and is used to use the stripping and clarification liquid produced in the first stripping and clarification unit as a nickel-magnesium extraction precursor liquid for the black powder nickel-magnesium extraction line. The embodiment of the present application realizes the series connection of the two production lines and the recycling of resources by using the washing and clarification liquid and the stripping and clarification liquid in the cobalt intermediate product magnesium extraction line as the precursor liquids of the black powder nickel-magnesium extraction line, making the entire recycling system more compact and efficient, and reducing production costs. Furthermore, the embodiment of the present application considers that in the cobalt intermediate magnesium extraction line, the first washing and clarification unit is immediately after the first multi-stage extraction unit, which is used to wash the organic phase obtained from the first multi-stage extraction unit and remove impurities entrained therein. At this time, a small amount of magnesium ions in the organic phase may enter the washing liquid to form a washing clarified liquid. Since the washing clarified liquid may contain magnesium ions washed from the organic phase, therefore, returning it to the black powder nickel-magnesium extraction line can make these magnesium ions re-participate in the extraction process, realize the recycling of magnesium resources, and avoid the waste of resources caused by direct discharge. Similarly, the stripping clarified liquid obtained after clarification treatment by the first stripping and clarification unit may also contain valuable metal elements such as magnesium, cobalt, and nickel. Therefore, returning it to the black powder nickel-magnesium extraction line can make these metals re-participate in the extraction process, realize the recycling of resources, and effectively reduce the waste of resources in the extraction production line during battery recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the system framework of the battery recycling system involved in the embodiment of the present application. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the system framework of the battery recycling system involved in the embodiment of the present application. Figure 2 ;

[0031] Figure 3 This is a schematic diagram of the system framework of the battery recycling system involved in the embodiment of the present application. Figure 3 ;

[0032] Figure 4 This is a schematic diagram of the system framework of the battery recycling system involved in the embodiment of the present application. Figure 4 ;

[0033] Figure 5 This is a schematic diagram of the system framework of the battery recycling system involved in the embodiment of the present application. Figure 5 .

[0034] Description of reference numerals:

[0035] 100. Black powder extraction nickel-magnesium line; 110. Second multi-stage extraction unit; 120. Second washing and clarification unit;

[0036] 130, second washing unit; 140, second stripping and clarification unit; 150, second multi-stage stripping unit;

[0037] 160, second saponification unit; 170, second raffinate clarification unit; 180, nickel-magnesium extraction front liquid storage tank;

[0038] 101, open circuit fluid storage tank; 102, first valve; 103, second valve; 104, third valve;

[0039] 105. Anti-iron unit; 106. Chlorine washing unit; 107. Second organic clarification unit;

[0040] 200, magnesium extraction line for cobalt intermediates; 210, first multi-stage extraction unit;

[0041] 220, first washing and clarifying unit; 230, first washing unit; 240, first stripping and clarifying unit;

[0042] 250, first multi-stage stripping unit; 260, first saponification unit; 270, first raffinate clarification unit;

[0043] 280, post-magnesium extraction liquid storage tank; 290, pre-magnesium extraction liquid storage tank; 201, first organic clarification unit;

[0044] 300, manganese extraction line for cobalt intermediate products; 400, cobalt extraction line for cobalt intermediate products.

[0045] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions and advantages of the examples of the present application clearer, the technical solutions in the examples of the present application will be described clearly and completely below. Where specific conditions are not specified in the examples, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0047] The following detailed description of the battery recycling system disclosed herein will be described in detail, with appropriate reference to the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of substantially identical structures may be omitted. This is done to avoid unnecessary redundancy and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to facilitate a thorough understanding of the present application by those skilled in the art and are not intended to limit the subject matter of the claims.

[0048] The "ranges" disclosed herein are defined in terms of lower and upper limits, where a given range is defined by selecting a lower limit and an upper limit, and the selected lower and upper limits define the boundaries of the particular range. Ranges defined in this manner can be inclusive or exclusive of the end values and can be combined arbitrarily, i.e., any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 to 120 and 80 to 110 are listed for a particular parameter, it is understood that ranges of 60 to 110 and 80 to 120 are also contemplated. Furthermore, if minimum range values of 1 and 2 are listed, and if maximum range values of 3, 4, and 5 are listed, the following ranges are all contemplated: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise indicated, the numerical range "a to b" is a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0049] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0050] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, a method includes steps (a) and (b), which indicates that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, a method may further include step (c), which indicates that step (c) may be added to the method in any order, for example, the method may include steps (a), (b), and (c), or may include steps (a), (c), and (b), or may include steps (c), (a), and (b), etc.

[0051] To make the above-mentioned objects, features and advantages of the present application more clearly understood, the technical solutions of the present application are further described below with reference to the accompanying drawings and embodiments. However, the present application is not limited to the embodiments listed, but also includes any other known modifications within the scope of the rights claimed in the present application.

[0052] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0053] In conventional technology, the raffinate and stripping liquor produced by the previous extraction line usually flow directly into the next process as raw materials or are directly stored as finished products. However, if the previous step fails to effectively extract the valuable metals it targets, it may affect the extraction efficiency of the subsequent extraction production line and lead to waste of metal resources.

[0054] An embodiment of the present application provides a battery recycling system, comprising a black powder nickel-magnesium extraction line and a cobalt intermediate product magnesium extraction line, and the cobalt intermediate product magnesium extraction line further comprises: a first multi-stage extraction unit, a first washing and clarification unit, a first washing unit, a first stripping and clarification unit, and a first multi-stage stripping unit connected in sequence, wherein the first washing and clarification unit is connected to the black powder nickel-magnesium extraction line, so that the washing and clarification liquid produced in the first washing and clarification unit can be used as a nickel-magnesium extraction precursor liquid for the black powder nickel-magnesium extraction line; the first stripping and clarification unit is connected to the black powder nickel-magnesium extraction line, and is used to use the stripping and clarification liquid produced in the first stripping and clarification unit as a nickel-magnesium extraction precursor liquid for the black powder nickel-magnesium extraction line. The embodiment of the present application realizes the series connection of the two production lines and the recycling of resources by using the washing and clarification liquid and the stripping and clarification liquid in the cobalt intermediate product magnesium extraction line as the precursor liquids of the black powder nickel-magnesium extraction line, making the entire recycling system more compact and efficient, and reducing production costs. Furthermore, the embodiment of the present application considers that in the cobalt intermediate magnesium extraction line, the first washing and clarification unit is immediately after the first multi-stage extraction unit, which is used to wash the organic phase obtained from the first multi-stage extraction unit and remove impurities entrained therein. At this time, a small amount of magnesium ions in the organic phase may enter the washing liquid to form a washing clarified liquid. Since the washing clarified liquid may contain magnesium ions washed from the organic phase, therefore, returning it to the black powder nickel-magnesium extraction line can make these magnesium ions re-participate in the extraction process, realize the recycling of magnesium resources, and avoid the waste of resources caused by direct discharge. Similarly, the stripping clarified liquid obtained after clarification treatment by the first stripping and clarification unit may also contain valuable metal elements such as magnesium, cobalt, and nickel. Therefore, returning it to the black powder nickel-magnesium extraction line can make these metals re-participate in the extraction process, realize the recycling of resources, and effectively reduce the waste of resources in the extraction production line during battery recycling.

[0055] The first embodiment of the present application provides a battery recycling system, referring to Figure 1 , the system includes:

[0056] Black powder extracted nickel-magnesium wire 100;

[0057] A cobalt intermediate product magnesium extraction line 200, comprising: a first multi-stage extraction unit 210, a first washing and clarification unit 220, a first washing unit 230, a first stripping and clarification unit 240, and a first multi-stage stripping unit 250 connected in sequence;

[0058] The first washing and clarifying unit 220 is connected to the black powder nickel-magnesium extraction wire 100, and is used to use the washing and clarifying liquid produced in the first washing and clarifying unit 220 as the nickel-magnesium extraction pre-liquid of the black powder nickel-magnesium extraction wire 100;

[0059] The first stripping and clarification unit 240 is connected to the black powder nickel-magnesium extraction line 100 and is used to use the stripping and clarification liquid generated in the first stripping and clarification unit 240 as the nickel-magnesium extraction precursor liquid of the black powder nickel-magnesium extraction line 100 .

[0060] Alternatively, black powder typically refers to a mixed powder containing valuable metals such as nickel, cobalt, and manganese recovered from used batteries (such as lithium batteries). It is typically black in color, hence the name "black powder." The black powder nickel-magnesium extraction line 100 is a specialized extraction process line specifically designed to extract nickel and magnesium from black powder. The goal of this process line is to separate and enrich nickel and magnesium from the black powder leachate to produce high-purity nickel and magnesium products.

[0061] Optionally, the extraction order of each metal in the black powder line can be: extraction of manganese, extraction of cobalt, extraction of nickel and extraction of magnesium.

[0062] Alternatively, a cobalt intermediate product refers to an intermediate product from the hydrometallurgical cobalt smelting process that has undergone preliminary processing but has not yet reached the purity requirements for the final product. The cobalt intermediate magnesium extraction line 200 is a specialized extraction process line specifically designed to extract magnesium from the cobalt intermediate product. This process line aims to separate and enrich magnesium from the leachate of the cobalt intermediate product to produce a high-purity magnesium product.

[0063] Optionally, the first multi-stage extraction unit 210 refers to setting up multiple continuous extraction stages in the magnesium extraction line, each stage can include an extraction reactor (such as a mixing and settling tank), and through multi-stage countercurrent extraction, magnesium ions are gradually transferred from the aqueous phase to the organic phase, thereby improving the extraction rate and enrichment degree of magnesium.

[0064] Optionally, the first multi-stage extraction unit 210 includes a first extraction stage A, a second extraction stage A, a third extraction stage A, a fourth extraction stage A, a fifth extraction stage A, and a sixth extraction stage A, which are arranged in sequence, wherein the first extraction stage A is the starting stage of the extraction process, and the sixth extraction stage A is the last stage of the extraction process.

[0065] Alternatively, in the first multi-stage extraction unit 210, the aqueous phase (i.e., pre-extraction solution, magnesium extraction pre-solution) can flow from the sixth extraction stage A to the first extraction stage A. Countercurrent operation can be used to gradually reduce the concentration of the target metal ions in the aqueous phase while increasing the concentration of the target metal ions in the organic phase. The organic phase (i.e., extractant) can flow from the first extraction stage A to the sixth extraction stage A, thereby gradually enriching the target metal ions in the organic phase and removing impurities.

[0066] Optionally, the extractant used in the first extraction unit may be P507.

[0067] Optionally, the first washing and clarification unit 220 is used to perform preliminary washing and clarification treatment on the organic phase after multi-stage extraction to remove residual aqueous phase impurities and suspended matter in the organic phase, stabilize the composition of the organic phase, create better conditions for subsequent multi-stage washing, and reduce the impact of impurities on subsequent processes.

[0068] Optionally, since the first washing and clarifying unit 220 is immediately following the first multi-stage extraction unit 210 in the cobalt intermediate product magnesium extraction line 200, the organic phase obtained from the first multi-stage extraction unit 210 is washed and impurities entrained therein are removed. At this time, a small amount of magnesium ions in the organic phase may enter the washing liquid, forming a washing clarified liquid. Since the washing clarified liquid may contain magnesium ions washed from the organic phase, it is recirculated to the black powder nickel-magnesium extraction line 100, allowing these magnesium ions to re-participate in the extraction process, realizing the recycling of magnesium resources and avoiding resource waste caused by direct discharge.

[0069] Optionally, the first washing unit 230 may be a multi-stage countercurrent washing unit, which may include multiple washing reactors. The multi-stage countercurrent washing gradually removes residual impurities and unextracted aqueous phase components in the organic phase, further improving the purity of the organic phase. The countercurrent operation can maximize washing efficiency and reduce the amount of detergent used.

[0070] Optionally, the first stripping and clarification unit 240 is a unit that clarifies the organic phase after multi-stage washing and the aqueous phase after multi-stage stripping. Since the first stripping and clarification unit 240 clarifies the aqueous phase obtained after stripping in the first multi-stage stripping unit 250, the magnesium stripping clarified liquid produced in the first stripping and clarification unit 240 is likely to contain at least a portion of the magnesium ions washed from the aqueous phase. Therefore, refluxing it to the black powder nickel-magnesium extraction line 100 allows these magnesium ions to re-participate in the extraction process, thereby achieving the recycling of magnesium resources and avoiding resource waste caused by direct discharge.

[0071] Optionally, the first multi-stage stripping unit 250 is a unit for performing multi-stage countercurrent stripping on the organic phase, typically comprising multiple stripping reactors. Through the multi-stage countercurrent stripping, magnesium ions are gradually desorbed from the organic phase into the aqueous phase, which then enters the first stripping clarification unit 240 for clarification, thereby obtaining a high-purity magnesium solution.

[0072] Optionally, the black powder nickel-magnesium extraction wire 100 may include a nickel-magnesium extraction front liquid storage tank 180 for storing the nickel-magnesium extraction front liquid; and the first washing and clarification unit 220 and the first stripping and clarification unit 240 may both be connected to the nickel-magnesium front liquid storage tank, thereby using the washing clarified liquid and the stripping clarified liquid as the nickel-magnesium extraction front liquid of the black powder nickel-magnesium extraction wire 100, respectively.

[0073] Optionally, when the amount of liquid stored in the nickel-magnesium extraction front liquid storage tank 180 reaches a preset liquid storage threshold, the liquid outlet valve of the storage tank is opened to perform clarification, extraction, washing, back-extraction and other processes.

[0074] In one possible implementation, referring to Figure 2 The cobalt intermediate magnesium extraction line 200 further includes a first saponification unit 260 and a first raffinate clarification unit 270;

[0075] The first saponification unit 260 is connected to the first raffinate clarification unit 270;

[0076] The first raffinate clarification unit 270 is connected to the first multi-stage extraction unit 210 .

[0077] Alternatively, many extraction systems utilize acidic phosphorus extractants, such as P204 and P507. These extractants, in their unsaponified state, have limited extraction capabilities for certain metal ions. Therefore, in this embodiment of the present application, a first saponification unit 260 is provided within the cobalt intermediate magnesium extraction line 200 to add an alkali (such as sodium hydroxide or sodium carbonate) to the extractant (i.e., the organic phase), causing the extractant molecules to undergo a saponification reaction, generating the corresponding salt form. This conversion can effectively improve the extractant's selectivity and extraction efficiency for specific metal ions.

[0078] Optionally, the first raffinate clarification unit 270 is used to clarify the saponified extractant and raffinate.

[0079] In one possible implementation, referring to Figure 2 The black powder extracted nickel-magnesium wire 100 includes: a second multi-stage extraction unit 110, a second washing and clarifying unit 120, a second washing unit 130, a second stripping and clarifying unit 140 and a second multi-stage stripping unit 150 connected in sequence.

[0080] Optionally, the black powder nickel-magnesium extraction line 100 further includes a second saponification unit 160 and a second raffinate clarification unit 170;

[0081] The second saponification unit 160 is connected to the second raffinate clarification unit 170;

[0082] The second raffinate clarification unit 170 is connected to the second multi-stage extraction unit 110 .

[0083] Optionally, the first washing and clarifying unit 220 is connected to the second multi-stage extraction unit 110 ; and the first stripping and clarifying unit 240 is connected to the second multi-stage extraction unit 110 .

[0084] Optionally, refer to Figure 3 The black powder nickel-magnesium extraction line 100 may include a nickel-magnesium extraction front liquid storage tank 180 for storing the nickel-magnesium extraction front liquid. The nickel-magnesium extraction front liquid storage tank 180 is connected to the second multi-stage extraction unit 110, and the first washing and clarification unit 220 and the first stripping and clarification unit 240 may both be connected to the nickel-magnesium front liquid storage tank.

[0085] In this embodiment, a battery recycling system is provided, including a black powder-extracted nickel-magnesium wire 100 and a cobalt intermediate-product-extracted magnesium wire 200. The cobalt intermediate-product-extracted magnesium wire 200 further includes: a first multi-stage extraction unit 210, a first washing and clarification unit 220, a first washing unit 230, a first stripping and clarification unit 240, and a first multi-stage stripping unit 250, which are connected in sequence. The first washing and clarification unit 220 is connected to the black powder-extracted nickel-magnesium wire 100 so that the washing and clarification liquid produced in the first washing and clarification unit 220 can be used as a nickel-magnesium pre-extraction liquid for the black powder-extracted nickel-magnesium wire 100. The first stripping and clarification unit 240 is connected to the black powder-extracted nickel-magnesium wire 100 so that the stripping and clarification liquid produced in the first stripping and clarification unit 240 can be used as a nickel-magnesium pre-extraction liquid for the black powder-extracted nickel-magnesium wire 100. The embodiment of the present application realizes the series connection of the two production lines and the recycling of resources by using the washing clarified liquid and the anti-magnesium clarified liquid in the cobalt intermediate magnesium extraction line 200 as the pre-liquid of the black powder nickel-magnesium extraction line 100, making the entire recovery system more compact and efficient, and reducing production costs. Furthermore, the embodiment of the present application considers that in the cobalt intermediate magnesium extraction line 200, the first washing and clarifying unit 220 is immediately after the first multi-stage extraction unit 210, which is used to wash the organic phase obtained from the first multi-stage extraction unit 210 and remove the impurities entrained therein. At this time, a small amount of magnesium ions in the organic phase may enter the washing liquid to form a washing clarified liquid. Since the washing clarified liquid may contain magnesium ions washed from the organic phase, it is refluxed to the black powder nickel-magnesium extraction line 100, so that this part of the magnesium ions can re-participate in the extraction process, realize the recycling of magnesium resources, and avoid the waste of resources caused by direct discharge. Similarly, the stripping clarification liquid obtained after clarification treatment by the first stripping clarification unit 240 may also contain valuable metal elements such as magnesium, cobalt, and nickel. Therefore, returning it to the black powder nickel-magnesium extraction line 100 can allow these metals to re-participate in the extraction process, realize the recycling of resources, and effectively reduce the waste of resources in the extraction production line during the battery recycling process.

[0086] Based on the above first embodiment, a second embodiment of the present application is proposed. In this embodiment, referring to Figure 4 , the system further comprises: an open circuit fluid storage tank 101;

[0087] The first stripping and clarification unit 240 is connected to the open circuit liquid storage tank 101 via a first valve 102;

[0088] When the cobalt content in the de-magnesium clarified liquid is greater than a first cobalt content threshold, the first valve 102 is opened.

[0089] Optionally, the open-circuit fluid stored in the open-circuit fluid storage tank 101 refers to a liquid containing specific components discharged from a specific process or unit in the battery recycling process. The open-circuit fluid may contain various metal ions, acidic or alkaline substances, and other chemical components, depending on the process flow and the raw materials being processed. The open-circuit fluid can be further processed or recycled.

[0090] Optionally, a first valve 102 is provided in the pipe connecting the first stripping and clarification unit 240 and the open-circuit liquid storage tank 101. When the cobalt content in the de-magnesium clarified liquid generated in the first stripping and clarification unit 240 is greater than a first cobalt content threshold, indicating that the cobalt content in the de-magnesium clarified liquid is high, the first valve 102 is opened to allow the de-magnesium clarified liquid to flow into the open-circuit liquid storage tank 101.

[0091] In one possible implementation, referring to Figure 4 , the first stripping and clarification unit 240 is connected to the black powder extraction nickel-magnesium line 100 through a second valve 103;

[0092] When the nickel content in the de-magnesium clarified liquid is greater than the first nickel content threshold and the cobalt content is less than or equal to the first cobalt content threshold, the second valve 103 is opened.

[0093] Optionally, a second valve 103 is provided in the pipeline connecting the first stripping and clarification unit 240 and the black powder nickel-magnesium extraction line 100. When the nickel content in the stripping and clarification liquid is greater than a first nickel content threshold and the cobalt content is less than or equal to the first cobalt content threshold, it indicates that the cobalt content in the stripping and clarification liquid is low, but the nickel content is high. In this case, the second valve 103 is opened to allow the stripping and clarification liquid to flow into the nickel-magnesium extraction front liquid storage tank 180 of the black powder nickel-magnesium extraction line 100 to serve as the nickel-magnesium extraction front liquid.

[0094] In one possible implementation, referring to Figure 4 The cobalt intermediate magnesium extraction line 200 also includes: a magnesium stripping liquid storage tank 280 connected to the first multi-stage stripping unit 250, which is used to collect waste liquid in the cobalt intermediate magnesium extraction line 200. These waste liquids can then be sent to the magnesium stripping liquid heavy tank in the wastewater workshop for treatment.

[0095] Optionally, the first multi-stage stripping unit 250 may include a first stripping stage, a second stripping stage, a third stripping stage, a fourth stripping stage, a fifth stripping stage, a sixth stripping stage and a seventh stripping stage, wherein the first stripping stage is the starting stage of the stripping process and the seventh stripping stage is the last stage of the stripping process.

[0096] Optionally, the magnesium stripping liquid storage tank 280 may be connected to the third stripping stage and / or the fourth stripping stage in the first multi-stage stripping unit 250 .

[0097] In one possible implementation, referring to Figure 4 , the first stripping and clarification unit 240 is connected to the reverse magnesium liquid storage tank 280 through a third valve 104;

[0098] When the nickel content in the de-magnesium clarified liquor is less than the second nickel content threshold, and the cobalt content is less than or equal to the first cobalt content threshold, opening the third valve 104;

[0099] The first nickel content threshold is greater than the second nickel content threshold.

[0100] Optionally, a third valve 104 is provided in the connecting pipe between the first stripping and clarification unit 240 and the de-magnesium post-liquid storage tank 280. When the nickel content in the de-magnesium clarified liquid is less than a second nickel content threshold, and the cobalt content is less than or equal to the first cobalt content threshold, it indicates that the nickel and cobalt contents in the de-magnesium clarified liquid are both low, and therefore, the recycling value is low. Therefore, the third valve 104 is opened to allow the de-magnesium clarified liquid to flow into the de-magnesium post-liquid storage tank 280.

[0101] In one possible implementation, referring to Figure 4 The black powder extracted nickel-magnesium wire 100 includes: a second multi-stage stripping unit 150 , and the second multi-stage stripping unit 150 is connected to the open circuit liquid storage tank 101 .

[0102] Optionally, in the black powder nickel-magnesium extraction line 100, according to the theory that extraction is easy but reverse is difficult and the reverse flow factor of the organic phase and the aqueous phase, the cobalt element that has not been completely extracted in the previous cobalt extraction line of the black powder is likely to be enriched in the reverse extraction unit of the nickel-magnesium extraction line, usually reaching three to ten grams per liter. Since the economic value of cobalt is relatively high, the second multi-stage reverse extraction unit 150 can be connected to the open-circuit liquid storage tank 101 to recover the cobalt element.

[0103] Optionally, the second multi-stage stripping unit 150 includes a first extraction stage B, a second extraction stage B, a third extraction stage B, a fourth extraction stage B, a fifth extraction stage B and a sixth extraction stage B, which are arranged in sequence, wherein the first extraction stage B is the starting stage of the extraction process, and the sixth extraction stage B is the last stage of the extraction process.

[0104] Optionally, since the cobalt element that is not completely extracted in the previous cobalt extraction line of the black powder is likely to be enriched in the third extraction stage B and / or the fourth extraction stage B of the nickel-magnesium extraction line, the third extraction stage B and / or the fourth extraction stage B are connected to the open-circuit liquid storage tank 101.

[0105] In one possible implementation, referring to Figure 4 , the battery recycling system also includes:

[0106] The cobalt intermediate product manganese extraction line 300, the open circuit liquid storage tank 101 is connected to the cobalt intermediate product manganese extraction line 300, and the open circuit liquid in the open circuit liquid storage tank 101 will serve as the manganese extraction pre-liquid of the cobalt intermediate product manganese extraction line 300;

[0107] The cobalt intermediate product cobalt extraction line 400 and the cobalt intermediate product manganese extraction line 300 are connected. The manganese extraction residual liquid of the cobalt intermediate product manganese extraction line 300 will serve as the cobalt extraction precursor liquid of the cobalt intermediate product cobalt extraction line 400.

[0108] In one possible implementation, referring to Figure 4 The cobalt intermediate product cobalt extraction line 400 is connected to the cobalt intermediate product magnesium extraction line 200 , and the cobalt extraction residual liquid of the cobalt intermediate product cobalt extraction line 400 will be used as the magnesium extraction precursor liquid of the cobalt intermediate product magnesium extraction line 200 .

[0109] Optionally, the extraction order of the elements in the cobalt intermediate is manganese extraction, cobalt extraction, and magnesium extraction. Therefore, the cobalt-rich open-circuit liquid stored in the open-circuit liquid storage tank 101 can be re-flowed into the extraction line of the cobalt intermediate. According to the extraction order, it is first used as the manganese extraction pre-liquid of the cobalt intermediate manganese extraction line 300 for manganese extraction. The manganese extraction residual liquid can be further used as the cobalt extraction pre-liquid of the cobalt intermediate cobalt extraction line 400 for cobalt extraction. Furthermore, the cobalt extraction post-liquid can be used as the magnesium extraction pre-liquid for further magnesium extraction, thereby realizing the series connection of multiple extraction lines, making the entire recovery system more compact and efficient, and reducing production costs.

[0110] Optionally, refer to Figure 5 The cobalt intermediate magnesium extraction line 200 further includes a magnesium extraction precursor liquid storage tank 290 connected to the first multi-stage extraction unit 210 ; the cobalt intermediate cobalt extraction line 400 can be connected to the magnesium extraction precursor liquid storage tank 290 .

[0111] Optionally, refer to Figure 5 Valves can be installed in the connecting pipelines of each unit, liquid storage tank, etc. to control the circulation of the liquid.

[0112] Optionally, refer to Figure 5 The cobalt intermediate product magnesium extraction line 200 further includes a first organic clarification unit 201 connected to the first multi-stage stripping unit 250.

[0113] Optionally, refer to Figure 5 The black powder extraction nickel-magnesium line 100 further includes an anti-iron unit 105 , a chlorine washing unit 106 , and a second organic clarification unit 107 which are sequentially connected to the second multi-stage extraction unit 110 .

[0114] In this embodiment, since the nickel content of the cobalt intermediate is typically low, to optimize the number of extraction lines, the first washing unit 230 of the cobalt intermediate magnesium extraction line 200 in the embodiment of the present application can be used as a nickel extraction line. Specifically, the organic phase obtained by the first washing and clarification unit 220 contains only magnesium ions and may also contain nickel ions. The first washing unit 230 typically uses an acidic solution to wash the organic phase. Therefore, during the washing process, the acidic solution can be used to resolve the nickel ions in the organic phase, that is, separate them from the organic phase while the magnesium ions remain in the organic phase and enter the subsequent stripping stage. Therefore, the first washing unit 230 of the cobalt intermediate magnesium extraction line 200 in the embodiment of the present application can be used as a nickel extraction line, effectively optimizing the number of extraction lines.

[0115] In this embodiment, if the raffinate from the previous cobalt intermediate line (i.e., the cobalt intermediate cobalt extraction line 400) exhibits excessive cobalt content, the first multi-stage stripping unit 250 of the cobalt intermediate magnesium extraction line 200 of this embodiment of the present application can also be used as a cobalt extraction line to optimize the number of extraction lines. Specifically, in the first multi-stage stripping unit 250, an acidic solution is typically used to desorb magnesium ions from the organic phase into the aqueous phase. Since cobalt ions are difficult to strip, they remain in the organic phase. In this way, magnesium and cobalt are effectively separated, with magnesium entering the aqueous phase and cobalt remaining in the organic phase, achieving cobalt extraction.

[0116] The above are only preferred embodiments of the present application and are not intended to limit the scope of the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of the present invention.

Claims

1. A battery recycling system, characterized in that: The system comprises: Black powder extracted nickel-magnesium wire; A cobalt intermediate product magnesium extraction line, comprising: a first multi-stage extraction unit, a first washing and clarification unit, a first washing unit, a first stripping and clarification unit, and a first multi-stage stripping unit connected in sequence; The first washing and clarifying unit is connected to the black powder nickel-magnesium extraction line, and is used to use the washing and clarifying liquid produced in the first washing and clarifying unit as the nickel-magnesium extraction pre-liquid of the black powder nickel-magnesium extraction line; The first stripping and clarification unit is connected to the black powder nickel-magnesium extraction line and is used to use the stripping and clarification liquid produced in the first stripping and clarification unit as the nickel-magnesium extraction precursor liquid of the black powder nickel-magnesium extraction line.

2. The battery recycling system according to claim 1, characterized in that: The system further comprises: an open circuit fluid storage tank; The first stripping and clarification unit is connected to the open circuit liquid storage tank via a first valve; When the cobalt content in the de-magnesium clarified liquid is greater than a first cobalt content threshold, the first valve is opened.

3. The battery recycling system according to claim 2, wherein: The first stripping and clarification unit is connected to the black powder extraction nickel-magnesium line via a second valve; When the nickel content in the de-magnesium clarified liquid is greater than a first nickel content threshold and the cobalt content is less than or equal to the first cobalt content threshold, the second valve is opened.

4. The battery recycling system according to claim 3, characterized in that: The cobalt intermediate product magnesium extraction line further includes: a magnesium stripping liquid storage tank connected to the first multi-stage stripping unit.

5. The battery recycling system according to claim 4, characterized in that: The first stripping and clarification unit is connected to the magnesium stripping liquid storage tank via a third valve; When the nickel content in the de-magnesium clarified liquid is less than the second nickel content threshold value, and the cobalt content is less than or equal to the first cobalt content threshold value, opening the third valve; The first nickel content threshold is greater than the second nickel content threshold.

6. The battery recycling system according to claim 2, wherein: The black powder extracted nickel-magnesium line comprises: a second multi-stage stripping unit, and the second multi-stage stripping unit is connected to the open circuit liquid storage tank.

7. The battery recycling system according to claim 2, wherein: The system further comprises: A cobalt intermediate product manganese extraction line, wherein the open-circuit liquid storage tank is connected to the cobalt intermediate product manganese extraction line, and the open-circuit liquid in the open-circuit liquid storage tank will serve as the manganese extraction pre-liquid of the cobalt intermediate product manganese extraction line; The cobalt intermediate product cobalt extraction line and the cobalt intermediate product manganese extraction line, the manganese extraction residual liquid of the cobalt intermediate product manganese extraction line will be used as the cobalt extraction precursor liquid of the cobalt intermediate product cobalt extraction line.

8. The battery recycling system according to claim 7, characterized in that: The cobalt intermediate product cobalt extraction line is connected to the cobalt intermediate product magnesium extraction line, and the cobalt extraction residual liquid of the cobalt intermediate product cobalt extraction line will serve as the magnesium extraction precursor liquid of the cobalt intermediate product magnesium extraction line.

9. The battery recycling system according to claim 1, wherein: The cobalt intermediate magnesium extraction line also includes a first saponification unit and a first raffinate clarification unit; The first saponification unit is connected to the first raffinate clarification unit; The first raffinate clarification unit is connected to the first multi-stage extraction unit.

10. The battery recycling system according to claim 1, wherein: The black powder nickel-magnesium extraction line comprises: a second multi-stage extraction unit, a second washing and clarifying unit, a second washing unit, a second stripping and clarifying unit and a second multi-stage stripping unit connected in sequence.

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