CN212357343U - Cobalt metal recovery equipment for lithium ion battery waste - Google Patents

Abstract

The utility model discloses cobalt metal recovery equipment for lithium ion battery waste, which comprises a stirring tank, a solid-liquid separation tank and a hydrothermal reaction tank which are connected by pipelines in sequence; the solid-liquid separation tank comprises a separation tank body and a centrifugal barrel arranged in the separation tank body, wherein the upper part of the centrifugal barrel is connected with an output shaft of a centrifugal motor through a spoke, the lower end of the centrifugal barrel is provided with a solid discharge pipe, and the periphery of the solid discharge pipe is in sealed rotary connection with the tank body through a bearing; the lower end of the solid discharge pipe is provided with a discharge port deviating towards one side, a mandril penetrates through the center of the discharge port, and an outer conical baffle is arranged above the mandril; a discharging cylinder is arranged below the ejector rod. The utility model discloses the mixture after will stirring directly sends to solid-liquid separation jar through the pipeline, has reduced the intermediate link, can improve recovery efficiency. The solid-liquid separation tank adopts a centrifugal barrel with an inner conical surface, and solid materials can be quickly discharged after centrifugal solid-liquid separation. A solid material isolation tank is arranged above the stirring tank, so that intermittent feeding and recovery can be realized, and mechanized operation can be realized.

Description

Cobalt metal recovery equipment for lithium ion battery waste

Technical Field

The utility model relates to a cobalt metal recovery plant especially relates to a recovery plant who retrieves cobalt in electrode material, adhesive and the mixture of conductive carbon material.

Background

Currently, Lithium Ion Batteries (LIBs) have been widely used in electronic devices, Electric Vehicles (EVs), and electrochemical power storage systems due to their high power, high energy density, high open circuit voltage, long storage life, low self-discharge rate, and wide operating temperature range. With the updating of consumer electronics and the coming of a large number of power batteries into a scrapping period, the number of waste lithium batteries will rise sharply, and the recovery and explosion of the lithium batteries are in the future. The power battery is about to meet the first decommissioning tide, and if the power battery cannot be properly treated, environmental pollution and resource waste can be caused. Although LIBs are technically considered "green" they are flammable with electrolytes that release toxic gases such as HF if the LIB is burned or exposed to air or water. In addition, Co and Ni used in LIB are also classified as carcinogenic, mutagenic substances, and have reproductive toxicity. Therefore, the positive electrode material in the waste lithium battery is recycled, the environmental pollution and the pathogenic risk can be effectively reduced, and the recycling efficiency of the raw material is improved. From an economic perspective, LIB recovery is also very important for saving resources and recovering high cost metals, and therefore, the recovery of waste LIBs is of great significance. How to reasonably recover and utilize valuable elements of the waste lithium ion batteries, improve the resource recycling rate and reduce the environmental pollution becomes a problem to be solved urgently at present, and has important environmental and economic significance. Currently, there is no large-scale recycling business in the world, because the past battery consumption is not enough to make the relevant business generate economic benefit. However, the left-over of untreated used batteries may become a serious environmental problem and destroy the results that have promoted adoption of electric vehicles. The purpose of the recovery is to separate the components of the waste product into different fractions and to reintroduce these fractions into the production, with the aim of reducing waste and of disposing of the harmful substances in an energy-saving and economical manner.

Generally, based on reaction characteristics, the treatment process of waste LIBs can be divided into three categories: physical, chemical and biological methods. The waste lithium batteries are various in composition and large in material property difference, and in the recycling process, the batteries need to be pretreated, all components are disassembled and classified, and then valuable metals are recovered and purified by adopting different technologies. Physical recycling processes are often used as a pre-treatment to separate the anode material from other components (e.g., current collectors and binders) to reduce impurities and facilitate subsequent recycling. And common physical recovery methods are mechanical separation and organic solvent dissolution, depending on the different physical properties of LIB (including density, solubility, magnetic properties, etc.). The valuable metals are leached from the pretreated positive electrode material by a plurality of methods, most commonly by chemical treatment methods such as acid leaching and alkali leaching, and then the valuable metal elements are recovered and purified. Typical recovery and purification methods mainly include a flotation method, a precipitation method, a solvent extraction method and an electrodeposition method. And the other method is a bioleaching method, such as the recovery of cobalt and lithium in the waste lithium ion battery by using ferrous acidophilic oxidizing bacillus. Although the method provides a new method for recovering cobalt element, the leaching rate of lithium cobaltate by the ferrous acidophilic oxide bacillus is very low, so that strains with higher leaching rate need to be cultured in the future. Compared with other methods, the bioleaching method has the advantages of low acid consumption, low cost, simple operation, small environmental influence and the like, but has long period, and needs to be researched intensively in the aspects of strain selection culture, leaching condition control and bioleaching mechanism.

The traditional lithium ion battery recovery technology comprises the processes of pyrometallurgy, hydrometallurgy and the like, and has no exception that the positive electrode material is crushed and screened, then the processes of high-temperature incineration, acid leaching, alkali leaching or acid-base combination and the like are adopted, and after valuable metals are dissolved, the technologies of precipitation, extraction and the like are adopted to purify and recover elements such as cobalt, lithium and the like. Although the valuable elements in the waste lithium batteries are successfully recovered by the process technologies to obtain high-purity products, certain resources and energy are wasted, and the recovery process is complex and difficult to scale up. The industrial scale recovery process of waste LIBs is mainly based on a pyrometallurgical method, which is simple to operate but requires higher energy consumption and produces secondary pollution.

Therefore, there is a need for a new recovery plant to achieve more efficient cobalt metal recovery.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a cobalt metal recovery plant of lithium ion battery waste material to the above-mentioned problem that exists among the prior art.

The purpose of the utility model is realized through the following technical scheme:

a cobalt metal recovery device for lithium ion battery waste comprises a stirring tank, a solid-liquid separation tank and a hydrothermal reaction tank which are sequentially connected by pipelines; the solid-liquid separation tank comprises a separation tank body and a centrifugal barrel arranged in the separation tank body, wherein the upper part of the centrifugal barrel is connected with an output shaft of a centrifugal motor through a spoke, the lower end of the centrifugal barrel is provided with a solid discharge pipe, and the periphery of the solid discharge pipe is in sealed rotary connection with the tank body through a bearing; the lower end of the solid discharge pipe is provided with a discharge port deviating towards one side, a mandril penetrates through the center of the solid discharge pipe, an outer conical baffle is arranged above the mandril, and the outer conical baffle keeps sealing contact with the inner conical surface of the centrifugal barrel when solid-liquid separation is carried out, so that the solid is prevented from descending; and a discharging cylinder is arranged below the ejector rod, when the discharging cylinder rises, the outer conical baffle is lifted through the ejector rod, and solid materials are discharged to the solid discharging pipe from a gap between the outer conical baffle and the inner conical surface of the centrifugal barrel.

Preferably, a cleaning agent input pipe is further arranged above the tank body to inject water or alcohol for cleaning; the lower end of the centrifugal barrel is provided with a conical baffle plate for blocking the solution from entering the bearing; and a solid recovery box is arranged below the discharge port.

Preferably, the stirring tank comprises a stirring tank body, a stirring motor is arranged above the stirring tank body, the stirring motor is connected with a stirring rod in a downward transmission manner, and the lower end of the stirring rod is provided with a stirring blade; an alkali metal input pipe, a solvent input pipe, a first inert gas input pipe, a first vacuumizing pipe and a solid material isolation tank are further arranged above the stirring tank body; the solid material isolation tank comprises an isolation tank body, a discharge valve arranged below the isolation tank body, a feeding valve arranged above the isolation tank body, a second inert gas input pipe and a second vacuum pumping pipe.

Preferably, the hydrothermal reaction tank comprises a hydrothermal tank body, a liquid inlet valve arranged above the hydrothermal tank body, and a crystallization discharge valve arranged below the hydrothermal tank body; the crystallization discharge valve is also connected with a crystallization recovery pipe; and a filter screen is arranged on the lower side of the crystallization recovery pipe to filter the residual solution after the hydrothermal reaction to a solution recovery tank.

Preferably, the hydrothermal reaction tanks are at least two, the hydrothermal reaction tank further comprises a rack, a turntable arranged above the rack and a driving mechanism for driving the turntable, and the hydrothermal reaction tanks are uniformly arranged on the turntable.

The utility model also discloses a solid-liquid separation tank, which comprises a separation tank body and a centrifugal barrel arranged in the separation tank body, wherein the upper part of the centrifugal barrel is connected with an output shaft of a centrifugal motor through a spoke arranged on the centrifugal barrel, the lower end of the centrifugal barrel is provided with a solid discharging pipe, and the periphery of the solid discharging pipe is rotationally connected with the tank body in a sealed way through a bearing; the lower end of the solid discharge pipe is provided with a discharge port deviating towards one side, a mandril penetrates through the center of the solid discharge pipe, an outer conical baffle is arranged above the mandril, and the outer conical baffle keeps sealing contact with the inner conical surface of the centrifugal barrel when solid-liquid separation is carried out, so that the solid is prevented from descending; and a discharging cylinder is arranged below the ejector rod, when the discharging cylinder rises, the outer conical baffle is lifted through the ejector rod, and solid materials are discharged to the solid discharging pipe from a gap between the outer conical baffle and the inner conical surface of the centrifugal barrel.

Furthermore, a cleaning agent input pipe is arranged above the tank body to inject water or alcohol for cleaning; the lower end of the centrifugal barrel is provided with a conical baffle plate for blocking the solution from entering the bearing; and a solid recovery box is arranged below the discharge port.

The utility model also discloses a stirring tank, which comprises a stirring tank body, wherein a stirring motor is arranged above the stirring tank body, the stirring motor is connected with a stirring rod in a downward transmission way, and the lower end of the stirring rod is provided with stirring blades; an alkali metal input pipe, a solvent input pipe, a first inert gas input pipe, a first vacuumizing pipe and a solid material isolation tank are further arranged above the stirring tank body; the solid material isolation tank comprises an isolation tank body, a discharge valve arranged below the isolation tank body, a feeding valve arranged above the isolation tank body, a second inert gas input pipe and a second vacuum pumping pipe.

The utility model also discloses a hydrothermal reaction tank, which comprises a hydrothermal tank body, a liquid inlet valve arranged above the hydrothermal tank body, and a crystallization discharge valve arranged below the hydrothermal tank body; the crystallization discharge valve is also connected with a crystallization recovery pipe; and a filter screen is arranged on the lower side of the crystallization recovery pipe to filter the residual solution after the hydrothermal reaction to a solution recovery tank.

Furthermore, the hydrothermal reaction tanks are at least more than two, the hydrothermal reaction tank device further comprises a rack, a turntable arranged above the rack and a driving mechanism used for driving the turntable, and the hydrothermal reaction tanks are uniformly arranged on the turntable. Forming a rotating disc type hydrothermal reaction device.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses be equipped with agitator tank, solid-liquid separation jar and the hydrothermal reaction jar of pipeline hookup in proper order, the mixture accessible pipeline after the stirring directly sends to solid-liquid separation jar, has reduced the intermediate link, can improve recovery efficiency. The solid-liquid separation tank adopts a centrifugal barrel with an inner conical surface, and solid materials can be quickly discharged after centrifugal solid-liquid separation. A solid material isolation tank is arranged above the stirring tank, so that intermittent feeding and recovery can be realized, and mechanized operation can be realized. And directly sending the solution after solid-liquid separation to a hydrothermal reaction tank through a pipeline, and carrying out hydrothermal reaction to crystallize solid powder containing cobalt. Adopt the utility model discloses the recovery method of equipment can utilize alkali metal solution and electrode material in closed system, and the solid mixture reaction of adhesive and conductive carbon material draws cobalt element out, and reaction condition is mild and do not discharge the abandonment to the external environment, and wherein solvent still can be retrieved and is recycled, and the reaction is quick, and low cost need not consume energy such as extra electric energy, is the simple and convenient energy-conserving recovery mode of cobalt element in the effective recovery lithium cell.

Drawings

FIG. 1 is a schematic diagram of the steps of a cobalt metal recovery method used in the lithium ion battery waste recovery apparatus of the present invention;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the cobalt metal recycling apparatus for lithium ion battery waste according to the present invention;

FIG. 3 is an enlarged view of a portion of the agitator tank of the embodiment of FIG. 2;

FIG. 4 is an enlarged view of a portion of the solid-liquid separation tank of the embodiment of FIG. 2;

FIG. 5 is a partial enlarged view (carousel configuration) of a plurality of hydrothermal reaction tanks of the embodiment of FIG. 2;

FIG. 6 is an enlarged view of a portion of a single hydrothermal reaction tank of FIG. 5;

fig. 7 is a partially enlarged view of the turntable in fig. 5.

Detailed Description

The technical solutions of the present invention will be described clearly and completely through the following embodiments, which are only some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention. As used in the description of the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

As shown in fig. 1, the utility model relates to a recovery method for cobalt metal recovery equipment of lithium ion battery waste, which comprises the following steps: mixing solid waste with an alkali metal solution, fully reacting, and chelating to form a cobalt-organic matter intermediate; secondly, performing solid-liquid separation on the mixture of the solution containing the cobalt-organic matter intermediate and the solid; step three, carrying out hydrothermal reaction on the solution containing the cobalt-organic matter intermediate to crystallize cobalt hydroxide powder; the solid waste in the step one is waste containing cobalt element in the lithium ion battery, and is subjected to crushing and drying pretreatment when being mixed with an alkali metal solution; and (3) during solid-liquid separation in the second step, washing the surface of the solid with water and/or alcohol. 2. The first step further comprises a preparation step of an alkali metal solution, wherein the alkali metal is completely dissolved in a solvent under the protection of inert gas to obtain the alkali metal solution, the concentration of the alkali metal solution is more than 10-5 mol/L, and the solvent is an organic solvent or liquid ammonia; the alkali metal is at least one of lithium, sodium, potassium, rubidium, cesium, francium, beryllium, magnesium, calcium, strontium and barium; the molar ratio of alkali metal to solvent is 1: 0.0001 to 10. The organic solvent is at least one of methylamine, ethylamine, ethylenediamine, propylamine, propylenediamine, butylamine, butanediamine and multi-organic amine. The fully reacted solution in the first step is a free electron solution without protons. The solid waste is electrode material, adhesive and conductive carbon material.

The utility model discloses recovery plant includes agitator tank, solid-liquid separation jar and hydrothermal reaction jar.

The agitator tank includes the agitator tank body, and the top is equipped with agitator motor to the transmission hookup has the puddler, and the lower extreme of puddler is equipped with stirring vane. An alkali metal input pipe, a solvent input pipe, an inert gas input pipe, a vacuumizing pipe and a solid material isolation tank are further arranged above the stirring tank body. The working process is as follows:

1 closing a discharge valve of the solid material isolation tank, firstly pumping away air in the stirring tank body, and then filling inert gas.

2, putting alkali metal from an alkali metal input pipe, and putting a solvent from a solvent input pipe;

and 3, when the alkali metal and the solvent fully react, putting the pretreated solid waste into a solid material isolation tank, closing a feeding valve, vacuumizing the isolation tank, filling inert gas, vacuumizing again, filling the inert gas again, and performing secondary operation.

And 4, opening a discharge valve, pouring the solid waste into the stirring tank, and starting a stirring motor to stir and mix.

And 5, after the solid waste and the alkali metal solution are fully reacted, pumping the mixture into a mixture output valve, and enabling the solid-liquid mixture to flow to a solid-liquid separation tank.

6, under the centrifugal action of the solid-liquid separation tank, the solution flows out of the liquid discharge pipe to the hydrothermal reaction tank, and the solid is discharged to a solid secondary recovery tank from a solid discharge pipe arranged at the inner conical bottom of the separation barrel. The solid-liquid separation tank comprises a tank body and a centrifugal barrel arranged in the tank body, wherein the upper part of the centrifugal barrel is connected with an output shaft of a centrifugal motor through spokes (more than three spokes), the lower end of the centrifugal barrel is provided with a solid discharge pipe, and the periphery of the solid discharge pipe is in sealed rotary connection with the tank body through a bearing; the lower extreme of solid discharging pipe is equipped with towards the skew discharge gate of one side, and the ejector pin is worn to be equipped with in the center, and the top of ejector pin is equipped with outer toper baffle, and outer toper baffle plays the effect of keeping off toward solid descending when solid-liquid separation, when the solid ejection of compact, plays the guide effect. And a discharging cylinder is arranged below the ejector rod, when the discharging cylinder rises, the outer conical baffle is lifted through the ejector rod, and the solid is discharged to the solid discharging pipe from a gap between the outer conical baffle and the inner conical surface of the centrifugal barrel. A cleaning agent input pipe is arranged above the tank body to inject water or alcohol for cleaning. "C (B)

7, carrying out hydrothermal reaction on the solution in a hydrothermal reaction tank after separation to crystallize cobalt hydroxide powder crystals, and finally collecting the cobalt hydroxide powder crystals to a metal powder recovery tank through a crystallization recovery pipe (a filter screen is arranged at the lower side of the crystallization recovery pipe and can flow the residual solution to a solution recovery tank) under the action of gravity.

Because the structure of the current hydrothermal reaction tank is not common, the hydrothermal reaction kettle used in a laboratory is more frequently used. In the industrial production, the tank body is not suitable to be made too large considering that the time of the hydrothermal reaction is longer than the time of the stirring reaction and the solid-liquid separation, and the temperature and the pressure are required in the hydrothermal reaction. Therefore, a plurality of hydrothermal reaction tanks may be provided, and the hydrothermal reaction tanks may be configured to sequentially receive the solution after solid-liquid separation and sequentially perform hydrothermal reactions, thereby greatly improving the production efficiency.

The concrete structure is as shown in fig. 2 to 7, the utility model relates to a cobalt metal recovery plant of lithium ion battery waste material, including agitator tank R, solid-liquid separation jar S and hydrothermal reaction tank T of pipe connection in proper order. The tanks are connected with each other through valves and pipelines.

The solid-liquid separation tank S comprises a separation tank body 10 and a centrifugal barrel 20 arranged in the separation tank body 10, wherein the upper part of the centrifugal barrel 20 is connected with an output shaft 221 of a centrifugal motor 22 through an arranged spoke 21, the lower end of the centrifugal barrel 20 is provided with a solid discharge pipe 29, and the periphery of the solid discharge pipe 29 is in sealed rotary connection with the separation tank body 10 through a bearing 291; the lower end of the solid discharge pipe 29 is provided with a discharge hole 299 deviating towards one side, a mandril 28 is penetrated through the center, an outer conical baffle 281 is arranged above the mandril 28, and the outer conical baffle 281 keeps sealing contact with the inner conical surface 200 of the centrifugal barrel 20 when solid-liquid separation is carried out, so as to prevent the solid from descending; a discharging air cylinder 282 is arranged below the push rod 28. After the solid-liquid separation is completed, the discharge cylinder 282 is lifted, the outer conical baffle 281 is lifted by the lift pin 28, and the solid material is discharged from the gap between the outer conical baffle 281 and the inner conical surface 200 of the centrifuge bucket 20 to the solid discharge pipe 29. The feed pipe 24 is arranged above the separation tank body 10 and is positioned in the range of the wall of the centrifugal barrel 20, and the flowing mixture directly flows into the centrifugal barrel.

A cleaning agent input pipe (not shown) is arranged above the tank body to inject water or alcohol for cleaning; the lower end of the centrifugal barrel 20 is provided with a conical baffle 201 for blocking the solution from entering the bearing; a solid recovery tank 292 is arranged below the discharge port 299. The centrifuge bucket 20 has fine holes on its wall and inner conical surface for separating the solution from the solid surface to the inner wall of the tank and to the solution discharge pipe 27 during the spin-centrifugation.

The stirring tank R comprises a stirring tank body 30, a stirring motor 31 is arranged above the stirring tank body 30, the stirring motor 31 is connected with a stirring rod 32 in a downward transmission manner, and the lower end of the stirring rod 32 is provided with a stirring blade 33; an alkali metal input pipe 301, a solvent input pipe 302, a first inert gas input pipe 303, a first vacuum pipe 304 and a solid material isolation tank 40 are further arranged above the stirring tank body 30. The solid material isolation tank 40 comprises an isolation tank body 41, a discharge valve 42 arranged below the isolation tank body 41, a feeding valve 43 arranged above the isolation tank body 41 (a hopper 430 is also arranged above the isolation tank body, so that waste materials of the lithium ion battery can be poured conveniently), a second inert gas input pipe 44 and a second vacuum pumping pipe 45. The agitator tank 30 preferably has a conical bottom for agitation and a lower most drop valve 49. The stirred mixture flows from the drop valve 49 to the solid-liquid separation tank S.

The hydrothermal reaction tank T comprises a hydrothermal tank body 50, a liquid inlet valve 51 arranged above the hydrothermal tank body 50 and a crystallization discharge valve 52 arranged below the hydrothermal tank body 50; the crystallization discharge valve 52 is also connected with a crystallization recovery pipe 53; a filtering net 530 is provided at a lower side of the crystallization recovery pipe 53 to filter the residual solution after the hydrothermal reaction to the solution recovery tank 54. The crystallized cobalt hydroxide powder passes through the crystallization recovery pipe 53 and is collected in the crystallization recovery tank 55.

When a plurality of hydrothermal reaction tanks (a crystallization recovery tank and a solution recovery tank are correspondingly added), the hydrothermal reaction tank system further comprises a frame 60, a turntable 70 arranged above the frame 60, and a driving mechanism 61 (a motor, a speed reducer, a belt and the like) for driving the turntable 70, wherein the hydrothermal reaction tanks T are uniformly arranged on the turntable 70 through a support 59.

Since the solution discharge pipe 27 needs to be sequentially abutted against the liquid inlet valve 51, in order to reduce the contact with air, a liquid discharge abutting cylinder 25 (shown in fig. 4) may be added to drive a transition elevating pipe 251 sleeved on the outer periphery of the solution discharge pipe 27. When the turntable 70 needs to rotate, the liquid discharge butt joint air cylinder ascends to drive the transition lifting pipe to ascend and leave the inlet of the liquid inlet valve. And stopping the turntable after the turntable rotates. The liquor drainage butt joint air cylinder descends to drive the transition lifting pipe to descend, the transition lifting pipe is inserted into an inlet of a new liquor inlet valve, and the solution containing the cobalt-organic matter intermediate is conveyed through a pipeline.

The hydrothermal reaction tank can be additionally provided with a heating device or a turntable and a plurality of hydrothermal reaction tanks can be arranged in a larger oven because of the requirement of a recovery method. Because the liquid discharge butt joint air cylinder is arranged, all the hydrothermal reaction tanks can be isolated in the oven when liquid discharge is not in butt joint, and hydrothermal reaction at constant temperature is finished.

The solution in the solution recycling tank 54 may be processed (such as distilled water removal) and then mixed again in the first step for recycling. The raw material cost is reduced.

The valves described above preferably employ electrically controlled valves to facilitate automated control. These recycling facilities may be kept away from the recycling production.

The agitation tank, the solid-liquid separation tank and the hydrothermal reaction tank in the above examples may be used alone. Each is described below.

The utility model also discloses a solid-liquid separation tank, which comprises a separation tank body and a centrifugal barrel arranged in the separation tank body, wherein the upper part of the centrifugal barrel is connected with an output shaft of a centrifugal motor through a spoke arranged on the centrifugal barrel, the lower end of the centrifugal barrel is provided with a solid discharging pipe, and the periphery of the solid discharging pipe is rotationally connected with the tank body in a sealed way through a bearing; the lower end of the solid discharge pipe is provided with a discharge port deviating towards one side, a mandril penetrates through the center of the solid discharge pipe, an outer conical baffle is arranged above the mandril, and the outer conical baffle keeps sealing contact with the inner conical surface of the centrifugal barrel when solid-liquid separation is carried out, so that the solid is prevented from descending; and a discharging cylinder is arranged below the ejector rod, when the discharging cylinder rises, the outer conical baffle is lifted through the ejector rod, and solid materials are discharged to the solid discharging pipe from a gap between the outer conical baffle and the inner conical surface of the centrifugal barrel. The structure of the specific implementation can be referred to the above embodiments. Such a solid-liquid separation tank can be used in a case where solid-liquid separation is required, and is not limited to the recovery and treatment of lithium-ion waste.

Furthermore, a cleaning agent input pipe is arranged above the tank body to inject water or alcohol for cleaning; the lower end of the centrifugal barrel is provided with a conical baffle plate for blocking the solution from entering the bearing; and a solid recovery box is arranged below the discharge port.

The utility model also discloses a stirring tank, which comprises a stirring tank body, wherein a stirring motor is arranged above the stirring tank body, the stirring motor is connected with a stirring rod in a downward transmission way, and the lower end of the stirring rod is provided with stirring blades; an alkali metal input pipe, a solvent input pipe, a first inert gas input pipe, a first vacuumizing pipe and a solid material isolation tank are further arranged above the stirring tank body; the solid material isolation tank comprises an isolation tank body, a discharge valve arranged below the isolation tank body, a feeding valve arranged above the isolation tank body, a second inert gas input pipe and a second vacuum pumping pipe. The structure of the specific implementation can be referred to the above embodiments. The stirring tank is suitable for occasions needing sealed reaction and protective gas filling, and is not limited to the waste recovery and treatment of lithium electrons.

The utility model also discloses a hydrothermal reaction tank, which comprises a hydrothermal tank body, a liquid inlet valve arranged above the hydrothermal tank body, and a crystallization discharge valve arranged below the hydrothermal tank body; the crystallization discharge valve is also connected with a crystallization recovery pipe; and a filter screen is arranged on the lower side of the crystallization recovery pipe to filter the residual solution after the hydrothermal reaction to a solution recovery tank. The structure of the specific implementation can be referred to the above embodiments. Such a hydrothermal reaction tank can be used for industrial mass production of hydrothermal reactions, and is not limited to the recovery and treatment of lithium-ion waste.

Furthermore, the hydrothermal reaction tanks are at least more than two, the hydrothermal reaction tank device further comprises a rack, a turntable arranged above the rack and a driving mechanism used for driving the turntable, and the hydrothermal reaction tanks are uniformly arranged on the turntable. Forming a rotating disc type hydrothermal reaction device.

To sum up, the utility model discloses be equipped with agitator tank, solid-liquid separation jar and the hydrothermal reaction jar of pipeline hookup in proper order, the mixture accessible pipeline after the stirring directly sends to solid-liquid separation jar, has reduced the intermediate link, can improve recovery efficiency. The solid-liquid separation tank adopts a centrifugal barrel with an inner conical surface, and solid materials can be quickly discharged after centrifugal solid-liquid separation. A solid material isolation tank is arranged above the stirring tank, so that intermittent feeding and recovery can be realized, and mechanized operation can be realized. And directly sending the solution after solid-liquid separation to a hydrothermal reaction tank through a pipeline, and carrying out hydrothermal reaction to crystallize solid powder containing cobalt. Adopt the utility model discloses the recovery method of equipment can utilize alkali metal solution and electrode material in closed system, and the solid mixture reaction of adhesive and conductive carbon material draws cobalt element out, and reaction condition is mild and do not discharge the abandonment to the external environment, and wherein solvent still can be retrieved and is recycled, and the reaction is quick, and low cost need not consume energy such as extra electric energy, is the simple and convenient energy-conserving recovery mode of cobalt element in the effective recovery lithium cell.

The technical content of the present invention is further described by the embodiments only, so that the reader can understand it more easily, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation according to the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.

Claims (5)

1. Cobalt metal recovery equipment for lithium ion battery waste is characterized by comprising a stirring tank, a solid-liquid separation tank and a hydrothermal reaction tank which are sequentially connected through pipelines; the solid-liquid separation tank comprises a separation tank body and a centrifugal barrel arranged in the separation tank body, wherein the upper part of the centrifugal barrel is connected with an output shaft of a centrifugal motor through a spoke, the lower end of the centrifugal barrel is provided with a solid discharge pipe, and the periphery of the solid discharge pipe is in sealed rotary connection with the tank body through a bearing; the lower end of the solid discharge pipe is provided with a discharge port deviating towards one side, a mandril penetrates through the center of the solid discharge pipe, an outer conical baffle is arranged above the mandril, and the outer conical baffle keeps sealing contact with the inner conical surface of the centrifugal barrel when solid-liquid separation is carried out, so that the solid is prevented from descending; and a discharging cylinder is arranged below the ejector rod, when the discharging cylinder rises, the outer conical baffle is lifted through the ejector rod, and solid materials are discharged to the solid discharging pipe from a gap between the outer conical baffle and the inner conical surface of the centrifugal barrel.

2. The cobalt metal recovery equipment for lithium ion battery waste materials according to claim 1, wherein a cleaning agent input pipe is further arranged above the tank body to inject water or alcohol for cleaning; the lower end of the centrifugal barrel is provided with a conical baffle plate for blocking the solution from entering the bearing; and a solid recovery box is arranged below the discharge port.

3. The cobalt metal recovery equipment for lithium ion battery waste according to claim 2, wherein the stirring tank comprises a stirring tank body, a stirring motor is arranged above the stirring tank body, the stirring motor is connected with a stirring rod in a downward transmission manner, and the lower end of the stirring rod is provided with a stirring blade; an alkali metal input pipe, a solvent input pipe, a first inert gas input pipe, a first vacuumizing pipe and a solid material isolation tank are further arranged above the stirring tank body; the solid material isolation tank comprises an isolation tank body, a discharge valve arranged below the isolation tank body, a feeding valve arranged above the isolation tank body, a second inert gas input pipe and a second vacuum pumping pipe.

4. The cobalt metal recovery equipment for lithium ion battery waste according to claim 3, wherein the hydrothermal reaction tank comprises a hydrothermal tank body, a liquid inlet valve arranged above the hydrothermal tank body, and a crystallization discharge valve arranged below the hydrothermal tank body; the crystallization discharge valve is also connected with a crystallization recovery pipe; and a filter screen is arranged on the lower side of the crystallization recovery pipe to filter the residual solution after the hydrothermal reaction to a solution recovery tank.

5. The apparatus according to claim 4, wherein the hydrothermal reaction tanks are at least two and further comprise a frame, a turntable disposed above the frame, and a driving mechanism for driving the turntable, and the hydrothermal reaction tanks are uniformly mounted on the turntable.

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