CN220731619U - Waste battery metal extraction device - Google Patents
Waste battery metal extraction device Download PDFInfo
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- CN220731619U CN220731619U CN202322312713.9U CN202322312713U CN220731619U CN 220731619 U CN220731619 U CN 220731619U CN 202322312713 U CN202322312713 U CN 202322312713U CN 220731619 U CN220731619 U CN 220731619U
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- reaction
- reaction box
- box
- waste battery
- drainage tube
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 43
- 239000002184 metal Substances 0.000 title claims abstract description 42
- 238000000605 extraction Methods 0.000 title claims abstract description 39
- 239000010926 waste battery Substances 0.000 title claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 183
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims description 28
- 239000002699 waste material Substances 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 5
- 150000002739 metals Chemical class 0.000 abstract description 4
- 239000002244 precipitate Substances 0.000 abstract description 4
- 238000010517 secondary reaction Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 31
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 238000001914 filtration Methods 0.000 description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 7
- 229910052748 manganese Inorganic materials 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 6
- 229910052808 lithium carbonate Inorganic materials 0.000 description 6
- 239000007774 positive electrode material Substances 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 5
- 229910017052 cobalt Inorganic materials 0.000 description 5
- 239000010941 cobalt Substances 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 4
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 2
- BNBLBRISEAQIHU-UHFFFAOYSA-N disodium dioxido(dioxo)manganese Chemical compound [Na+].[Na+].[O-][Mn]([O-])(=O)=O BNBLBRISEAQIHU-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011656 manganese carbonate Substances 0.000 description 2
- 229940093474 manganese carbonate Drugs 0.000 description 2
- 235000006748 manganese carbonate Nutrition 0.000 description 2
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 2
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The utility model relates to a waste battery metal extraction device, which belongs to the technical field of metal recovery and extraction, and comprises a mounting seat, a reaction mechanism and a heating mechanism, wherein the reaction mechanism comprises a first reaction box for carrying out a first extraction reaction, a second reaction box for carrying out a second extraction reaction and a third reaction box for carrying out a third extraction reaction, the first reaction box, the second reaction box and the third reaction box are sequentially arranged on the mounting seat from top to bottom, a drainage tube is connected between every two adjacent reaction boxes, a filter box is fixedly arranged at the joint of the drainage tube and the first reaction box, the heating mechanism is propped against the bottom of the third reaction box, and in the waste battery metal extraction, the device independently carries out three different metal extraction reactions in three different containers, so that metal precipitates generated by chemical reactions are prevented from carrying out secondary reactions in the same container, and impurities are formed, so that separated metals in a waste battery are impure.
Description
Technical Field
The utility model belongs to the technical field of metal recovery and extraction, and particularly relates to a waste battery metal extraction device.
Background
The lithium ion battery is a secondary battery (rechargeable battery) and mainly depends on lithium ions to move between a positive electrode and a negative electrode to work, the positive electrode material of the lithium ion battery is generally lithium manganate, lithium cobaltate and nickel cobalt lithium manganate materials, the negative electrode material is generally graphite, the positive electrode material of the lithium ion battery contains a plurality of valuable metal elements such as manganese, cobalt, nickel, lithium and the like, in the recovery of waste batteries, the useful metals of the positive electrode material in the lithium ion battery are generally extracted and reused, and the collected positive electrode material needs to be converted into nickel cobalt lithium manganate mixed solution through pretreatment to further extract the metal materials. In the prior art, after waste lithium batteries are collected, the anode material is taken out and is converted into a nickel cobalt lithium manganate mixed solution for metal extraction through the following steps: 1. crushing the collected positive electrode material by a machine and then melting the crushed positive electrode material into sodium carbonate solution; 2. filtering and then adding hydrogen peroxide solution; 3. adding ammonia water after filtering; 4. filtering impurities. The nickel cobalt lithium manganate mixed solution is used for separating metal materials through the following steps: adding ammonium sulfate, filtering out manganese, adding sodium peroxide, filtering out cobalt and nickel, heating to boiling, adding concentrated sodium carbonate solution, and filtering to obtain lithium carbonate.
The patent of the authorized bulletin number CN202310285489.0 discloses a valuable metal extraction device of a waste lithium battery, which comprises a machine body and a box body, wherein a sedimentation tank is arranged in the machine body, a salvage assembly is arranged in the machine body, a storage bin is arranged in the box body, the pumping assembly comprises a water conveying pipeline, a connector, a connecting pipeline and a water suction pump, the connecting pipeline is arranged on the surface of the connector, a filter box is arranged in the box body, and a filter block is arranged in the filter box; and separating precipitates of manganese, nickel, drill and lithium carbonate from the mixed liquid of the nickel drill lithium manganate by adopting the modes of salvaging, sucking and filtering. But this device has the following problems: the device adds ammonium sulfate in the sedimentation tank to separate out manganese first, adds sodium peroxide in same sedimentation tank after filtering, and cobalt, nickel are separated because manganese can precipitate to the container bottom after the reaction, can not realize complete filtration, and two reactions all take place in same container, under the condition that manganese does not completely filter, manganese can carry out secondary reaction with sodium peroxide, produces sodium manganate, and sodium manganate takes place the reaction with the sodium carbonate of follow-up addition again and produces manganese carbonate, and manganese carbonate is insoluble in water and ethanol, forms impurity after mixing with lithium carbonate, leads to the metal of separation impure.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a waste battery metal extraction device.
The aim of the utility model can be achieved by the following technical scheme:
the utility model provides a waste battery metal extraction device, includes mount pad, reaction mechanism and heating mechanism, reaction mechanism is including being used for carrying out the first reaction box that draws the reaction for the first time, be used for carrying out the second reaction box that draws the reaction for the second time and be used for carrying out the third reaction box that draws the reaction for the third time, first reaction box the second reaction box with the third reaction box is installed from top to bottom in proper order on the mount pad, is connected with the drainage tube between every adjacent two reaction boxes, the drainage tube with the junction fixed mounting of first reaction box filters the box, heating mechanism fixed mounting is in on the mount pad, heating mechanism with third reaction box bottom offsets.
Preferably, the mounting seat is in a descending ladder shape, the first reaction box, the second reaction box and the third reaction box are sequentially and fixedly mounted at the step of the mounting seat from top to bottom, the first reaction box inclines towards the second reaction box, and the second reaction box inclines towards the third reaction box.
Preferably, a waste liquid box is further arranged, a drainage tube is connected between the waste liquid box and the third reaction box, and a connecting valve is arranged on the drainage tube.
Preferably, a connecting valve is arranged on the drainage tube between every two adjacent reaction boxes.
Preferably, a liquid pump is arranged on the drainage tube between every two adjacent reaction boxes.
Preferably, the first reaction box, the second reaction box and the third reaction box have the same structure, and the bottoms of the three reaction boxes are all provided with solid storage drawers in a drawing mode.
Preferably, the heating area of the heating mechanism is equal to the bottom area of the third reaction box.
Preferably, the top of the reaction box is provided with an exhaust port.
The beneficial effects of the utility model are as follows:
in the metal extraction of the waste battery, three different metal extraction reactions independently occur in three different containers, so that metal precipitates generated by chemical reactions are prevented from performing secondary reactions in the same container, impurities are further formed, and the separated metals in the waste battery are not pure.
Drawings
The present utility model is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
Fig. 1 is a schematic diagram of an overall structure of a metal extraction device for waste batteries according to an embodiment of the present utility model.
Legend: 1. a mounting base; 2. a reaction mechanism; 21. a first reaction cassette; 22. a second reaction cassette; 23. a third reaction cassette; 24. a drainage tube; 25. a filter box; 26. connecting a valve; 27. a liquid pump; 28. a solids receiving drawer; 29. an exhaust port; 210. a waste liquid box; 3. a heating mechanism.
Detailed Description
In order to further describe the technical means and effects adopted by the utility model for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the utility model with reference to the attached drawings and the preferred embodiment.
As shown in fig. 1, a metal extraction device for waste batteries comprises a mounting seat 1, a reaction mechanism 2 and a heating mechanism 3, wherein the mounting seat 1 is used for bearing the reaction mechanism 2 and the heating mechanism 3, the reaction mechanism 2 is used for extracting metals in the waste batteries, the reaction mechanism 2 comprises a first reaction box 21 for carrying out a first extraction reaction, a second reaction box 22 for carrying out a second extraction reaction and a third reaction box 23 for carrying out a third extraction reaction, the first reaction box 21, the second reaction box 22 and the third reaction box 23 are sequentially arranged on the mounting seat 1 from top to bottom, the heating mechanism 3 is fixedly arranged on the mounting seat 1 and is propped against the bottom of the third reaction box 23, and the heating mechanism 3 is used for providing heating conditions which must be met in chemical reactions. A drainage tube 24 is connected between every two adjacent reaction boxes, a filtering box 25 is fixedly arranged at the joint of the drainage tube 24 and the first reaction box 21, liquid after the first extraction reaction is filtered by the filtering box 25 and drained to the second reaction box 22, then the second extraction reaction is carried out, different kinds of chemical reactions are carried out in different containers, the secondary reaction of precipitated substances is avoided to generate impurities, the second reaction box 22 is connected with the third reaction box 23 through the drainage tube 24, the liquid after the second extraction reaction is drained to the third reaction box 23 after the liquid is filtered, the third extraction reaction is carried out, and the third reaction box 23 heats the liquid to the temperature required by the reaction through the heat provided by the heating mechanism 3.
In the metal extraction process of the waste battery, firstly, a nickel cobalt lithium manganate mixed solution obtained by pretreatment is placed into a first reaction box 21 through a feed inlet, ammonium sulfate is added into the first reaction box 21, manganese solid is generated after chemical reaction and deposited at the bottom of the first reaction box 21, a reacted solution is filtered by a filter box 25 to remove the manganese solid, then the manganese solid reaches a second reaction box 22 through a drainage tube 24, sodium peroxide is added into the second reaction box 22, cobalt and nickel solid is generated after chemical reaction and deposited at the bottom of the second reaction box 22, the reacted solution is filtered to remove the cobalt and nickel solid, then the solution reaches a third reaction box 23 through the drainage tube 24, and the solution in the third reaction box 23 is heated to be boiled by a heating mechanism 3, and then concentrated sodium carbonate is added to obtain lithium carbonate deposited in the solution.
In an embodiment, the liquid level of the solution after the reaction of the first reaction box 21 and the second reaction box 22 is slightly different, the reacted solution is easy to remain in the reaction box, so that the speed of the solution flowing to the next reaction box through the drainage tube 24 is slow, the reaction speed is reduced, the production efficiency is affected, based on the fact that the mounting seat 1 is arranged to be in a descending step shape, the first reaction box 21, the second reaction box 22 and the third reaction box 23 are sequentially and fixedly arranged at the step of the mounting seat 1 from top to bottom, the solution generates a certain height fall, the solution receives own gravity, the speed of the solution flowing to the next reaction box is improved, meanwhile, the first reaction box 21 is inclined towards the second reaction box 22, the second reaction box 22 is inclined towards the third reaction box 23, the solution in the reaction box flows towards the drainage tube 24, the solution flowing is further accelerated, and the production time is saved.
In an embodiment, when the metal extraction reaction is finished, there is a waste liquid generated in the reaction process in the third reaction box 23, the third reaction box 23 needs to be removed for cleaning the waste liquid, the time consuming for the disassembly and assembly process is long, the solution is difficult to be taken out, if the waste liquid in the third reaction box 23 is not taken out in time for collecting and processing, a large amount of liquid can increase the difficulty of filtering lithium carbonate solids, and meanwhile, the space in the third reaction box 23 is occupied, so that the waste liquid overflows. Based on this, the device still is equipped with waste liquid box 210, and waste liquid box 210 is arranged in subaerial to can change the position at will, be connected with drainage tube 24 between waste liquid box 210 and the third reaction box 23, waste liquid accessible drainage tube 24 in the third reaction box 23 flows to waste liquid box 210 in collect, and drainage tube 24 department is connected with the valve, closes the valve when solution reaction, can open the valve after the reaction finishes and collect the waste liquid, reduces the degree of difficulty that lithium carbonate solid was collected, and saves the time of collecting the waste liquid.
In an embodiment, the discharge hole in the reaction box is not blocked, the solution in the reaction box flows to the next reaction box when the chemical reaction does not fully occur, which definitely reduces the metal extraction rate, so that the solution in the reaction box needs to be controlled to flow to the next reaction box after the chemical reaction is fully performed, on the basis of the fact, the connection valve 26 is arranged on the drainage tube 24 between every two adjacent reaction boxes, when the solution reacts, the valve is closed, after the solution fully reacts, the valve is opened to enable the solution to flow to the next reaction box, and the flow of the solution is further controlled by controlling the opening and closing of the valve, so that the chemical reaction is more complete, and the metal extraction rate is improved.
In one embodiment, the flow rate of the solution in the reaction cassette to the next reaction cassette is too slow, and thus productivity is affected, based on which a liquid pump 27 is installed on the drain 24 connected to the reaction cassette, so that the reaction solution flows to the next reaction cassette rapidly.
In an embodiment, metal solids are generated in all three reaction boxes, the generated metal solids are granular, and the solids are precipitated at the bottom of the reaction box due to gravity, so that the extracted metal materials are difficult to collect, based on the metal solids, the bottoms of the first reaction box 21, the second reaction box 22 and the third reaction box 23 are provided with a solid containing drawer 28 in a drawing manner, the reacted metal solids are precipitated in the containing drawer, after the reaction is finished, liquid can be drained firstly, then the containing drawer is drawn out, the metal solids are more convenient to collect, and the time for collecting the metal is saved.
In an embodiment, the original solution in the second reaction box 22 needs to be heated to boiling in the third reaction box 23 and then concentrated sodium carbonate solution is added, if the solution in the third reaction box 23 is heated unevenly, part of the solution can not reach the temperature required by the reaction, so that the chemical reaction is insufficient, the precipitation of metal is reduced, the chemical materials for extraction are wasted, based on the fact that the heating area of the heating mechanism 3 is equal to the bottom area of the third reaction box 23, the bottom of the third reaction box 23 is heated evenly, and the reaction is more sufficient.
In one embodiment, gas is generated during the chemical reaction in each step, if the gas is not timely discharged out of the reaction box, the solution in the reaction box flows back to interfere with the chemical reaction, and based on the problem, the top of the reaction box is provided with the gas outlet 29, the gas generated during the reaction is discharged, and the solution in the reaction box is prevented from flowing back.
The present utility model is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.
Claims (8)
1. A waste battery metal extraction device is characterized in that: including mount pad (1), reaction mechanism (2) and heating mechanism (3), reaction mechanism (2) are including being used for carrying out first reaction box (21) that draws the reaction for the first time, be used for carrying out second reaction box (22) that draws the reaction for the second time and be used for carrying out third reaction box (23) that draws the reaction for the third time, first reaction box (21) second reaction box (22) with third reaction box (23) are installed in proper order from top to bottom on mount pad (1), are connected with drainage tube (24) between every adjacent two reaction boxes, drainage tube (24) with junction fixed mounting filter box (25) of first reaction box (21), heating mechanism (3) fixed mounting is in on mount pad (1), heating mechanism (3) with third reaction box (23) bottom offsets.
2. The waste battery metal extraction device according to claim 1, wherein the mounting seat (1) is in a descending ladder shape, the first reaction box (21), the second reaction box (22) and the third reaction box (23) are sequentially and fixedly mounted at the step of the mounting seat (1) from top to bottom, the first reaction box (21) is inclined towards the second reaction box (22), and the second reaction box (22) is inclined towards the third reaction box (23).
3. The waste battery metal extraction device according to claim 1, further comprising a waste liquid box (210), wherein a drainage tube (24) is connected between the waste liquid box (210) and the third reaction box (23), and a connection valve (26) is arranged on the drainage tube (24).
4. The waste battery metal extraction device according to claim 1, wherein a connecting valve (26) is arranged on the drainage tube (24) between every two adjacent reaction boxes.
5. The waste battery metal extraction device according to claim 1, wherein a liquid pump (27) is arranged on the drainage tube (24) between every two adjacent reaction boxes.
6. The waste battery metal extraction device according to claim 1, wherein the first reaction box (21), the second reaction box (22) and the third reaction box (23) are identical in structure, and a solid storage drawer (28) is arranged at the bottom of each of the three reaction boxes in a drawing mode.
7. The waste battery metal extraction device according to claim 1, wherein the heating area of the heating mechanism (3) is equal to the bottom area of the third reaction box (23).
8. The waste battery metal extraction device according to claim 1, wherein the top of the reaction box is provided with an exhaust port (29).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322312713.9U CN220731619U (en) | 2023-08-28 | 2023-08-28 | Waste battery metal extraction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322312713.9U CN220731619U (en) | 2023-08-28 | 2023-08-28 | Waste battery metal extraction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220731619U true CN220731619U (en) | 2024-04-05 |
Family
ID=90497596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322312713.9U Active CN220731619U (en) | 2023-08-28 | 2023-08-28 | Waste battery metal extraction device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220731619U (en) |
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2023
- 2023-08-28 CN CN202322312713.9U patent/CN220731619U/en active Active
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