Leaching device for recycling lithium battery positive electrode material

Abstract

The utility model discloses a leaching device for recycling a lithium battery positive electrode material. The leaching device comprises a leaching tank, a stirring paddle arranged in a tank body of the leaching tank, an overflow mixing tank, an underflow mixing tank, a liquid level floating ball and a centrifugal pump, the overflow mixing tank comprises a first overflow tank pool, a pH meter detector arranged in the first overflow tank pool, a sulfuric acid pipeline arranged in the first overflow tank pool, a second overflow tank pool, a discharge valve arranged at the lower part of the outer side surface of the second overflow tank pool, a liquid level floating ball and a partition plate arranged between the first overflow tank pool and the second overflow tank pool; the partition plate is lower than a groove plate of the overflow mixing groove; leached ore pulp is fed into a feeding port of the cyclone through the centrifugal pump, and overflow liquid is fed into the bottom of the first overflow groove pool through an overflow liquid pipe arranged on the cyclone. Leached ore pulp is divided into overflow liquid and underflow liquid through the cyclone, the overflow liquid is low in solid content, the underflow liquid is high in solid content, sulfuric acid is added into the overflow tank and flows to the leaching tank after being fully and uniformly mixed, and uniform adding of the sulfuric acid is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to non ferrous metallurgy field especially a kind of leaching device for lithium battery positive electrode material recovery. BACKGROUND

[0002] Current lithium battery positive electrode material valuable metal recovery technology mainly includes pyrometallurgical technology, hydrometallurgical technology and bio-metallurgical technology.

[0003] Hydrometallurgy is mainly to leach positive electrode material with inorganic acid or organic acid, metal enters into leaching solution in the form of ion, then through precipitation separation method, solvent extraction method, electrodeposition method, ion exchange method etc. Method is separated valuable metal in leaching solution one by one, obtains single metal product or metal compound. Hydrometallurgical technology has the advantages of low energy consumption, high product purity, high recovery rate, various metals can be recycled etc., is the most popular technology.

[0004] Leaching is an important step of lithium battery positive electrode material hydrometallurgical recovery, and the reduction leaching method of sulfuric acid + sulfite is widely used in industry at present, but the existing leaching device mainly uses traditional ore leaching equipment, and the addition of raw and auxiliary materials mainly adopts manual work, and the process control mainly relies on experience, which is easy to cause uneven distribution of sulfuric acid and reducing agent in the leaching process, thereby generating a large amount of SO2, reducing the utilization rate of raw and auxiliary materials, polluting the environment and low automation degree. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of leaching device for lithium battery positive electrode material recovery, to the existing process control difficulty, too much rely on operating experience, sulfuric acid and reducing agent are uneven in the recovery process, low degree of automation, environmental deterioration, leaching efficiency low etc.

[0006] To achieve the above object, the utility model adopts the following technical scheme: a kind of leaching device for lithium battery positive electrode material recovery, including leaching tank 1, the stirring paddle 2 being arranged in the tank body inside of leaching tank 1, cyclone 3, overflow mixing tank, underflow mixing tank, liquid level float ball 9, centrifugal pump 18;

[0007] Overflow mixing tank includes first overflow tank pool 4, the pH meter probe 5 being arranged in first overflow tank pool 4, sulfuric acid pipeline 6 being arranged in first overflow tank pool 4, second overflow tank pool 7, discharge valve 8 being arranged in the lower part of the outer side of second overflow tank pool 7, liquid level float ball 9, the partition plate 10 being arranged between first overflow tank pool 4 and second overflow tank pool 7, and the height of partition plate 10 is lower than the height of tank plate of overflow mixing tank;

[0008] Leaching ore pulp is sent into the feed inlet of cyclone 3 by centrifugal pump 18, and overflow liquid is sent into the bottom of first overflow tank pool 4 by overflow liquid pipe arranged in cyclone 3;

[0009] The bottom of the liquid level float ball 9 is connected with the discharge valve 8;

[0010] The underflow mixing tank comprises a first underflow tank 11, a second underflow tank 12, a third underflow tank 13, a first baffle 14 arranged between the first underflow tank 11 and the second underflow tank 12, and a second baffle 15 arranged between the second underflow tank 12 and the third underflow tank 13.

[0011] The bottom of the cyclone 3 is further provided with a pipeline in communication with the third underflow tank 13.

[0012] The upper portion of the leaching tank 1 is provided with an SO2 gas detector 16, and the other end of the SO2 gas detector 16 is in communication with the third underflow tank 13 through a pipeline.

[0013] Further, the second overflow tank 7 is further provided with a liquid level float ball 9.

[0014] Further, the pH detector 5 is arranged in the middle portion of the first overflow tank 4.

[0015] Further, the concentrated sulfuric acid pipeline 6 is further provided with a concentrated sulfuric acid pipeline 6 valve, and the concentrated sulfuric acid pipeline 6 valve and the pH detector 5 are in interlocking control.

[0016] Further, the top of the first baffle 14 is flush with the liquid level in the underflow mixing tank.

[0017] Further, the height of the second baffle 15 is lower than the height of the underflow mixing tank.

[0018] Further, the pipeline between the SO2 gas detector 16 and the third underflow tank 13 is further provided with a Jiaolong conveyor 17.

[0019] Further, the SO2 gas detector 16 and the sulfite Jiaolong conveyor 17 are in interlocking control.

[0020] Further, the leaching tank 1 is in a single-tank leaching mode.

[0021] The beneficial effects of the utility model lie in:

[0022] 1. The utility model provides a kind of leaching device for lithium battery positive electrode material recovery, and the leaching ore slurry is divided into overflow liquid and underflow liquid by cyclone, overflow liquid solid content is low, underflow liquid solid content is high, sulfuric acid is added to overflow tank, and after being fully mixed, it flows to leaching tank, to realize the uniform addition of sulfuric acid.

[0023] 2, overflow liquid solid content is low to the timely and accurate measurement of pH meter, so as to realize the precision and automatic control of sulfuric acid addition. The sulfite is transported to the underflow tank by the dragon, and after being fully mixed, it flows to the leaching tank. The operation of the dragon is connected with the SO2 gas content in the leaching tank to realize the accurate, uniform and automatic addition of the reducing agent. The trace SO2 generated in the leaching tank reaction process is sealed in the leaching tank, realizing recycling and zero emission of harmful gas.

[0024] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The main objects and other advantages of the present application can be achieved by the solutions specifically pointed out in the description. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described in detail below with reference to the accompanying drawings.

[0026] Figure 1 is a structural schematic view of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS: 1-leaching tank, 2-stirring paddle, 3-cyclone, 4-first overflow tank pool, 5-pH meter probe, 6-sulfuric acid pipeline, 7-second overflow tank pool, 8-discharge valve, 9-liquid level float ball, 10-separation plate, 11-first underflow tank pool, 12-second underflow tank pool, 13-third underflow tank pool, 14-first baffle, 15-second baffle, 16-SO2 gas probe, 17-dragon conveyor, 18-centrifugal pump, 81-valve one, 82-valve two, 83-valve three. DETAILED DESCRIPTION

[0028] As Figure 1 shown, the present application adopts the following technical solutions: a leaching device for lithium battery positive electrode material recovery, comprising a leaching tank 1, a stirring paddle 2 arranged inside the tank body of the leaching tank 1, a cyclone 3, an overflow mixing tank, an underflow mixing tank, a liquid level float ball 9 and a centrifugal pump 18; the overflow mixing tank comprises a first overflow tank pool 4, a pH meter probe 5 arranged in the first overflow tank pool 4, a sulfuric acid pipeline 6 arranged in the first overflow tank pool 4, a second overflow tank pool 7, a discharge valve 8 arranged at the lower part of the outer side of the second overflow tank pool 7, a liquid level float ball 9, and a separation plate 10 arranged between the first overflow tank pool 4 and the second overflow tank pool 7, wherein the height of the separation plate 10 is lower than the height of the tank plate of the overflow mixing tank; the second overflow tank pool 7 is further provided with a liquid level float ball 9.

[0029] The leaching slurry is sent into the feed inlet of the cyclone 3 by the centrifugal pump 18, and the overflow liquid is sent into the bottom of the first overflow tank pool 4 through the overflow liquid pipe arranged in the cyclone 3;

[0030] The bottom of the liquid level float ball 9 is connected with the discharge valve 8.

[0031] The underflow mixing tank comprises a first underflow tank 11, a second underflow tank 12, a third underflow tank 13, a first baffle 14 arranged between the first underflow tank 11 and the second underflow tank 12, and a second baffle 15 arranged between the second underflow tank 12 and the third underflow tank 13, wherein the bottom of the first baffle 14 is arranged to be flush with the bottom of the underflow mixing tank, and the second baffle 15 is arranged to have a gap with the bottom of the underflow mixing tank;

[0032] The bottom of the cyclone 3 is further provided with a pipeline in communication with the third underflow tank 13.

[0033] The upper portion of the leaching tank 1 is provided with an SO2 gas detector 16, and the other end of the SO2 gas detector 16 is in communication with the third underflow tank 13 through a pipeline.

[0034] The pH detector 5 is arranged in the middle of the first overflow tank 4. The concentrated sulfuric acid pipeline 6 is further provided with a concentrated sulfuric acid pipeline 6 valve, and the concentrated sulfuric acid pipeline 6 valve and the pH detector 5 are in interlocking control.

[0035] The top of the first baffle 14 is flush with the liquid level in the underflow mixing tank. The height of the second baffle 15 is lower than the height of the underflow mixing tank.

[0036] The pipeline between the SO2 gas detector 16 and the third underflow tank 13 is further provided with an auger conveyor 17, and the SO2 gas detector 16 and the sulfite auger conveyor 17 are in interlocking control.

[0037] The leaching tank 1 is in a single-tank leaching mode. After leaching is completed, the pipeline valve two 82 is opened, the valve three 83 is closed, and the centrifugal pump delivers the leached ore material to the filtering device for the next process.

[0038] The leaching tank is not provided with a vent hole, and a small amount of SO2 generated in the reaction is sealed in the upper portion of the leaching tank to maintain a certain micro-positive pressure.

[0039] The addition mode and implementation form of sulfuric acid and reducing agents such as sulfite can be regarded as an auxiliary material adding system. The sulfuric acid is added to the overflow liquid mixing tank and mixed with the overflow liquid of the cyclone, and then flows into the leaching tank under the action of gravity; the underflow liquid enters the underflow mixing tank, and the reducing agent such as sulfite is added to the underflow mixing tank through the auger conveyor and mixed with the underflow of the cyclone, and then flows into the leaching tank under the action of gravity, so as to realize precise addition of sulfuric acid and reducing agents.

[0040] In working, the lithium battery positive electrode material recovery powder is added into the aqueous solution of the leaching tank, the pulp concentration is controlled to be 10-30%, the centrifugal pump 18 is started, the flow of the centrifugal pump 18 is controlled to be 1 / 5-1 / 2 of the volume of the pulp, the pH control range is set to be 1.0-1.5, that is, when the detected pH is less than 1.0, the sulfuric acid pipeline valve 81 is closed, when the pH is greater than 1.5, the sulfuric acid pipeline valve 81 is opened. The sulfite feeder 17 and the SO2 gas detector 16 are interlocked, the SO2 gas content is controlled to be 100-300 ppm, that is, when the SO2 detector 16 detects that the SO2 is less than 100 ppm, the feeder runs, the sulfite is added, when the SO2 detector 16 detects that the SO2 is greater than 300 ppm, the feeder 17 stops running. The leaching process is automatically controlled, when the sulfuric acid and the sulfite stop adding for more than or equal to 20 minutes, it is considered that the leaching is completed, the pipeline of the centrifugal pump 18 is switched to the filtration setting.

[0041] The above merely describes a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any change or replacement thought by any person skilled in the art within the technical range disclosed by the present application should be covered in the protection scope of the present application.

Claims

1. A leaching device for recycling lithium battery cathode materials, characterized in that: The overflow mixing tank comprises a first overflow tank pool (4), a pH meter detector (5) arranged in the first overflow tank pool (4), a sulfuric acid pipeline (6) arranged in the first overflow tank pool (4), a second overflow tank pool (7), a discharge valve (8) arranged at the lower part of the outer side of the second overflow tank pool (7), a liquid level float ball (9), and a partition plate (10) arranged between the first overflow tank pool (4) and the second overflow tank pool (7), wherein the height of the partition plate (10) is lower than the height of the tank plate of the overflow mixing tank. The overflow liquid is sent to the bottom of the first overflow tank pool (4) through the overflow liquid pipeline arranged in the cyclone (3). The bottom of the liquid level float ball (9) is connected with the discharge valve (8). The bottom flow mixing tank comprises a first bottom flow tank pool (11), a second bottom flow tank pool (12), a third bottom flow tank pool (13), a first baffle (14) arranged between the first bottom flow tank pool (11) and the second bottom flow tank pool (12), and a second baffle (15) arranged between the second bottom flow tank pool (12) and the third bottom flow tank pool (13), wherein the bottom of the first baffle (14) is arranged in close contact with the bottom of the bottom flow mixing tank, and the second baffle (15) has a gap with the bottom of the bottom flow mixing tank. The bottom of the cyclone (3) is further provided with a pipeline in communication with the third bottom flow tank pool (13). The upper part of the leaching tank (1) is provided with an SO2 gas detector (16), and the other end of the SO2 gas detector (16) is in communication with the third bottom flow tank pool (13) through a pipeline. The second overflow tank pool (7) is further provided with a liquid level float ball (9).

2. The leaching apparatus of claim 1, wherein, The pH meter detector (5) is arranged in the middle part of the first overflow tank pool (4).

3. The leaching apparatus of claim 1, wherein, The sulfuric acid pipeline (6) is further provided with a concentrated sulfuric acid pipeline (6) valve, and the concentrated sulfuric acid pipeline (6) valve and the pH meter detector (5) are in interlocking control.

4. The leaching apparatus of claim 1, wherein The top of the first baffle (14) is flush with the liquid surface in the bottom flow mixing tank.

5. The infusion device of claim 1, wherein, The height of the second baffle (15) is lower than the height of the bottom flow mixing tank.

6. The infusion device of claim 1, wherein The pipeline between the SO2 gas detector (16) and the third bottom flow tank pool (13) is further provided with a Jiaolong conveyor (17).

7. The infusion device of claim 1, wherein The SO2 gas detector (16) and the Jiaolong conveyor (17) of sulfite are in interlocking control.

8. The leaching apparatus of claim 7, wherein, The leaching tank (1) is in a single-tank leaching mode.

9. The infusion device of claim 1, wherein, ​

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