A kind of metal lithium waste recovery device and method

Abstract

The present invention provides a metal lithium waste recovery device and method, which relates to the field of lithium recovery technology, and aims to solve the problem of poor safety when metal lithium waste is recovered by hydrolysis. The metal lithium waste recovery device includes: a reactor, which is provided with a reaction chamber inside, for placing metal lithium waste; an intelligent sprayer, which is used to spray atomized water into the reaction chamber; a monitor, which is used to monitor the reaction sound of the metal lithium waste and the atomized water in the reaction chamber; a controller, which is configured to: obtain the reaction sound of the metal lithium waste and the atomized water through the monitor, and control the amount of atomized water sprayed by the intelligent sprayer into the reaction chamber according to the reaction sound. The metal lithium waste recovery device provided by the embodiment of the present invention is used to recycle metal lithium waste, and improves the safety of metal lithium waste recovery.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium recovery, and in particular to a device and method for recovering waste lithium metal. Background Art

[0002] Metallic lithium and its related products occupy an important position and application in the field of lithium batteries. However, during the application, it is inevitable to produce a lot of scraps, oxidized and nitrided lithium metal waste. If these lithium metal wastes are discarded at will, they will not only seriously pollute the environment and cause the loss of lithium elements, but may even cause safety hazards due to spontaneous combustion. Therefore, the recycling of lithium metal waste is particularly important and has great social and economic value.

[0003] At present, most metallic lithium waste is recycled by hydrolysis, that is, dissolving metallic lithium waste in water to obtain lithium compounds. However, due to the active nature of metallic lithium, the hydrolysis reaction when metallic lithium waste is dissolved in water is too violent, which will generate a lot of heat and easily cause dangerous situations such as combustion or even explosion, resulting in major safety issues in the recycling of metallic lithium waste. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a metal lithium waste recovery device and method to improve the safety of metal lithium waste recovery.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A metal lithium waste recovery device comprises: a reactor, wherein a reaction chamber is provided inside for placing metal lithium waste; an intelligent sprayer, which is used to spray atomized water into the reaction chamber; a monitor, which is used to monitor the reaction sound of the metal lithium waste and the atomized water in the reaction chamber; and a controller, which is configured to: obtain the reaction sound of the metal lithium waste and the atomized water through the monitor, and control the amount of atomized water sprayed by the intelligent sprayer into the reaction chamber according to the reaction sound.

[0007] Furthermore, the metal lithium waste recovery device also includes: a hydrogen concentration detector for detecting the hydrogen concentration in the reaction chamber; an air delivery system for delivering air to the reaction chamber; the controller is also configured to: obtain the current hydrogen concentration in the reaction chamber through the hydrogen concentration detector, and when the hydrogen concentration is greater than a preset value, control the air delivery system to deliver air to the reaction chamber.

[0008] Furthermore, the air delivery system includes: an air inlet pipe connected to the reaction chamber; an exhaust pipe connected to the reaction chamber; and a fan connected to the air inlet pipe or the exhaust pipe.

[0009] Furthermore, the metal lithium waste recovery device also includes: a filter screen, which is arranged in the reactor and divides the inner cavity of the reactor into a reaction chamber located above the filter screen and a recovery chamber located below the filter screen; and a discharge pipe, which is connected to the recovery chamber.

[0010] Furthermore, the metal lithium waste recovery device also includes: a gas storage tank for storing carbon dioxide; and a gas transmission pipe, both ends of which are respectively connected to the gas storage tank and the recovery chamber.

[0011] Furthermore, the reactor comprises: a reaction barrel, in which a chamber with a top opening is provided; and a barrel cover, which is sealed and covered on the top opening of the chamber.

[0012] Furthermore, the barrel wall of the reaction barrel has at least two layers of structure.

[0013] A method for recycling metal lithium waste comprises: placing metal lithium waste in a reaction chamber of a reactor, spraying atomized water into the reaction chamber to react with the metal lithium waste; obtaining a reaction sound between the metal lithium waste and the atomized water in the reaction chamber, and controlling the amount of atomized water sprayed into the reaction chamber according to the size of the reaction sound.

[0014] Furthermore, controlling the amount of atomized water sprayed into the reaction chamber according to the size of the reaction sound includes: when the reaction sound is greater than the maximum safe sound, reducing the amount of atomized water sprayed into the reaction chamber.

[0015] Furthermore, the metal lithium waste recovery method also includes: obtaining a current hydrogen concentration in the reaction chamber, and when the hydrogen concentration is greater than a preset value, supplying air into the reaction chamber.

[0016] The beneficial effects of the present invention are:

[0017] The metal lithium waste recovery device provided by the embodiment of the present invention monitors the reaction sound of the metal lithium waste and atomized water in the reaction chamber in real time through a monitor, and then uses the reaction sound of the metal lithium waste and the atomized water to reflect the intensity of the reaction between the metal lithium waste and the atomized water, and feeds back the reaction sound to the controller for data analysis, and then controls the amount of atomized water sprayed into the reaction chamber by the intelligent sprinkler through the controller. In this way, intelligent monitoring of the reaction between the metal lithium waste and the atomized water can be achieved, and a dynamic adjustment effect can be played to avoid the situation where the reaction between the metal lithium waste and the atomized water is too intense, thereby solving the problem in the prior art that dangerous situations such as combustion or even explosion occur due to the excessively intense reaction when the metal lithium waste is dissolved in water, thereby improving the safety of metal lithium waste recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below; obviously, the drawings described below are only some embodiments recorded in the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of a metal lithium waste recovery device provided in an embodiment of the present invention.

[0020] The reference numerals in the figure are: 10-reactor, 11-intelligent sprayer, 12-monitor, 13-controller, 14-hydrogen concentration detector, 15-air delivery system, 16-filter, 17-discharge pipe, 18-gas storage tank, 19-gas pipe, 20-stirring device, 101-reaction chamber, 102-recovery chamber, 103-reaction barrel, 104-barrel cover, 151-inlet pipe, 152-exhaust pipe, 153-fan. DETAILED DESCRIPTION

[0021] In order to make those skilled in the art better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] See also Figure 1 An embodiment of the present invention provides a metal lithium waste recovery device, comprising: a reactor 10, wherein a reaction chamber 101 is provided inside for placing metal lithium waste; an intelligent sprayer 11, which is used to spray atomized water into the reaction chamber 101; a monitor 12, which is used to monitor the reaction sound of the metal lithium waste and the atomized water in the reaction chamber 101; and a controller 13, which is configured to: obtain the reaction sound of the metal lithium waste and the atomized water through the monitor 12, and control the amount of atomized water sprayed by the intelligent sprayer 11 into the reaction chamber 101 according to the reaction sound.

[0023] The reactor 10 is a container having a reaction chamber 101 therein, and is used to place the metal lithium waste in the reaction chamber 101 of the reactor 10 for hydrolysis reaction when recycling metal lithium waste. The metal lithium waste refers to one or a mixture of pure metal lithium waste, lithium oxide waste, lithium nitride waste, lithium alloy (M=Mg, Zn, Cu, Sn, Si, Al, etc.) waste, and its shape can be granular, rod-shaped, and ribbon-shaped.

[0024] The intelligent sprinkler 11 is a device that uses a nozzle to decompose water flow into fine water droplets under a certain water pressure and can automatically control its water spraying amount. It mainly includes a sprinkler, a nozzle and a sprinkler pipe connected between the sprinkler and the nozzle. The intelligent sprinkler 11 can achieve the purpose of controlling the water spraying amount by controlling the speed of the water flow and / or the particle size of the fine water droplets. For example, the particle size of the fine water droplets sprayed by the intelligent sprinkler 11 is 0.5 to 4 mm, preferably 1 to 3 mm, and the water spraying speed is 1 to 150 ml / s, preferably 30 to 120 ml / s.

[0025] The nozzle of the intelligent sprinkler 11 is arranged in the reaction chamber 101 to spray atomized water into the reaction chamber 101 through the nozzle. For example, the nozzle of the intelligent sprinkler 11 is arranged in the middle position of the upper part of the reaction chamber 101. The atomized water is used to hydrolyze the metal lithium waste in the reaction chamber 101. Exemplarily, the atomized water is a mixture of water and oil substances such as KZ320 alkylbenzene, U10 and U330; wherein, oil substances such as KZ320 alkylbenzene, U10 and U330 refer to oils with low viscosity and do not react with water and metal lithium. By setting the atomized water as a mixture of water and oil substances, the water content per unit volume can be reduced, thereby reducing the intensity of the hydrolysis reaction of the metal lithium waste. Of course, the atomized water can also be other water or a mixture containing water that can hydrolyze the metal lithium waste, such as pure water, mineral water, etc., and the embodiment of the present invention is not limited in any way.

[0026] The monitor 12 is a device that can monitor the volume of sound. Exemplarily, the monitor 12 is a sound sensor, which refers to a sensor that can detect sound and convert the detected sound value into a usable output signal, and the sound sensor is arranged in the reaction chamber 101. Of course, the monitor 12 can also be other devices that have the function of monitoring the volume of sound, such as a monitoring device with a monitoring probe, and the monitoring probe is arranged in the reaction chamber 101. The embodiment of the present invention does not impose any limitation on this.

[0027] The more intense the reaction between the metal lithium waste and the atomized water in the reaction chamber 101 of the reactor 10, the louder the reaction sound. In the embodiment of the present invention, by providing the monitor 12, the reaction sound between the metal lithium waste and the atomized water can be monitored in real time, so that the magnitude of the reaction sound can be used to reflect the intensity of the reaction between the metal lithium waste and the atomized water.

[0028] Specifically, by means of an experiment, the safety sound when the metal lithium waste reacts with the atomized water in the reaction chamber 101 of the reactor 10 can be determined. For example, in the reaction chamber 101 of a certain reactor 10, the safety sound when the metal lithium waste reacts with the atomized water is less than 50 decibels, the warning sound is 50-65 decibels, and the dangerous sound is greater than 65 decibels. That is to say, when the reaction sound in the reaction chamber 101 is less than 50 decibels, it means that the reaction of the metal lithium waste with the atomized water is in a safe state; when the reaction sound in the reaction chamber 101 is 50-65 decibels, it means that the reaction of the metal lithium waste with the atomized water is in a warning adjustable state; when the reaction sound in the reaction chamber 101 is greater than 65 decibels, it means that the reaction of the metal lithium waste with the atomized water is in a dangerous state, in which dangerous situations such as combustion or even explosion are very likely to occur. The embodiment of the present invention does not limit the scope of the safety sound. It can be understood by those skilled in the art that the scope of the above-mentioned safety sound can be changed according to the different structures of the reactor 10.

[0029] The controller 13 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct other components to execute the control instruction. Exemplarily, the controller 13 can be a central processing unit, a general-purpose processor network processor, a digital signal processor, a programmable processor, a microprocessor, a microcontroller, a programmable controller or any combination thereof. The controller 13 can also be other devices with processing functions, such as circuits, devices or software modules, and the embodiments of the present invention do not impose any restrictions on this.

[0030] The controller 13 is connected to the smart sprinkler 11 and the listener 12 respectively, and the connection between them can be wired or wireless, which is not specifically limited here. The listener 12 sends the monitored reaction sound value to the controller 13, and the controller 13 controls the amount of atomized water sprayed by the smart sprinkler 11 into the reaction chamber 101 according to the reaction sound monitored by the listener 12. Exemplarily, when the reaction sound is greater than the maximum safe sound, the controller 13 controls the smart sprinkler 11 to reduce the amount of atomized water sprayed into the reaction chamber 101, thereby reducing the intensity of the reaction between the metal lithium waste and the atomized water, until the current reaction sound is less than or equal to the maximum safe sound.

[0031] When the reaction sound of the metal lithium waste and the atomized water monitored by the monitor 12 is less than or equal to the maximum safe sound, it indicates that the reaction of the metal lithium waste and the atomized water is in a safe state; in this case, the smaller the reaction sound, the smaller the intensity of the reaction between the metal lithium waste and the atomized water, and the lower the recovery efficiency. Therefore, under the premise of safe reaction, in order to improve the recovery efficiency, illustratively, when the reaction sound is less than the maximum safe sound-ΔN, the controller 13 controls the intelligent sprinkler 11 to increase the amount of atomized water sprayed into the reaction chamber 101, thereby increasing the intensity of the reaction between the metal lithium waste and the atomized water, until the current reaction sound is greater than or equal to the maximum safe sound-ΔN. Wherein, ΔN is the sound volume, the unit is decibel.

[0032] For example, 0<ΔN<maximum safe sound; for example, ΔN is 20-40 decibels. The embodiment of the present invention does not limit the range of ΔN, and those skilled in the art will appreciate that the range of ΔN may be changed according to actual needs.

[0033] The metal lithium waste recovery device provided in the embodiment of the present invention monitors the reaction sound of the metal lithium waste and atomized water in the reaction chamber 101 in real time through the monitor 12, and then uses the reaction sound of the metal lithium waste and the atomized water to reflect the intensity of the reaction between the metal lithium waste and the atomized water, and feeds back the reaction sound to the controller 13 for data analysis, and then controls the amount of atomized water sprayed by the intelligent sprinkler 11 into the reaction chamber 101 through the controller 13, so that intelligent monitoring of the reaction between the metal lithium waste and the atomized water can be achieved, and a dynamic adjustment effect can be played to avoid the situation where the reaction between the metal lithium waste and the atomized water is too intense, thereby solving the problem in the prior art that dangerous situations such as combustion or even explosion occur due to the excessively intense reaction when the metal lithium waste is dissolved in water, thereby improving the safety of metal lithium waste recovery.

[0034] In the above embodiment, the reactor 10 may be provided with an air inlet pipe and an exhaust pipe connected to the reaction chamber 101. During the recovery of metallic lithium waste, air may be continuously introduced into the reaction chamber 101 through the air inlet pipe, so that the mixture of air and hydrogen in the reaction chamber 101 may be discharged from the exhaust pipe in time. In this way, the hydrogen in the reaction chamber 101 may always be maintained at a low volume concentration state to avoid hydrogen explosion.

[0035] Continue to see Figure 1The metal lithium waste recovery device provided in an embodiment of the present invention further includes: a hydrogen concentration detector 14, used to detect the hydrogen concentration in the reaction chamber 101; an air delivery system 15, used to deliver air to the reaction chamber 101; the controller 13 is also configured to: obtain the current hydrogen concentration in the reaction chamber 101 through the hydrogen concentration detector 14, and when the hydrogen concentration is greater than a preset value, control the air delivery system 15 to deliver air to the reaction chamber 101.

[0036] The hydrogen concentration detector 14 refers to a device that can detect the hydrogen concentration. The air delivery system 15 refers to a device that delivers air. The controller 13 is connected to the hydrogen concentration detector 14 and the air delivery system 15 respectively, and the connection between them can be wired or wireless, which is not specifically limited here. In an embodiment of the present invention, the hydrogen concentration detector 14 is used to detect the hydrogen concentration in the reaction chamber 101, and the air delivery system 15 is used to deliver air to the reaction chamber 101. Exemplarily, the hydrogen concentration detector 14 sends the detected hydrogen concentration value to the controller 13. When the hydrogen concentration value is greater than a preset value, the controller 13 controls the air delivery system 15 to deliver air to the reaction chamber 101 to reduce the concentration of hydrogen until the hydrogen concentration in the reaction chamber 101 is less than the preset value. Of course, when the hydrogen concentration value is greater than the preset value, the controller 13 also controls the intelligent sprinkler 11 to reduce the amount of atomized water sprayed into the reaction chamber 101, so as to reduce the intensity of the reaction between the metallic lithium waste and the atomized water, reduce the amount of hydrogen generated by the reaction, and thereby quickly reduce the hydrogen concentration in the reaction chamber 101 to below the preset value.

[0037] Since the explosion limit of hydrogen in the air is 4% to 75.6% (volume concentration), that is, if the volume concentration of hydrogen in the air is between 4% and 75.6%, it will explode when encountering a fire source, and when the volume concentration of hydrogen in the air is less than 4% or greater than 75.6%, it will not explode even if encountering a fire source. Therefore, in the embodiment of the present invention, the preset value of the volume concentration of hydrogen set in the controller 13 is 4%. Of course, in other embodiments, the preset value of the volume concentration of hydrogen set in the controller 13 can also be less than 4%, which is not limited here.

[0038] The metal lithium waste recovery device provided in the embodiment of the present invention can detect the hydrogen concentration in the reaction chamber 101 in real time through the hydrogen concentration monitor 14, and send the hydrogen concentration value to the controller 13. When the hydrogen concentration is greater than the preset value in the controller 13, the controller 13 can timely control the air delivery system 15 to deliver air to the reaction chamber 101, which can not only reduce the reaction temperature in the reaction chamber 101, but also dilute the hydrogen concentration in the reaction chamber 101, so that the hydrogen concentration in the reaction chamber 101 is always maintained within a safe range, further eliminating the risk of combustion or even explosion, and playing a role in safely recovering metal lithium waste.

[0039] Exemplarily, the air delivery system 15 includes: an air inlet pipe 151, which is connected to the reaction chamber 101; an exhaust pipe 152, which is connected to the reaction chamber 101; and a fan 153, which is connected to the air inlet pipe 151 or the exhaust pipe 152. The fan 153 can be a blower or an exhaust fan.

[0040] When the fan 153 is a blower, the blower port of the blower is connected to one end of the air inlet pipe 151, and the blower is connected to the controller 13 in a wired or wireless manner. When the current hydrogen concentration value obtained by the controller 13 is greater than the preset value, the controller 13 controls the blower to blow air, and the blower transports air to the reaction chamber 101 through the air inlet pipe 151, and the mixture of air and hydrogen in the reaction chamber 101 is discharged through the exhaust pipe, thereby reducing the hydrogen concentration in the reaction chamber 101.

[0041] When the fan 153 is an exhaust fan, the exhaust port of the exhaust fan is connected to one end of the exhaust pipe 152, and the exhaust fan is connected to the controller 13 in a wired or wireless manner. When the current hydrogen concentration value obtained by the controller 13 is greater than the preset value, the controller 13 controls the exhaust fan to exhaust air, and the exhaust fan extracts the mixture of air and hydrogen in the reaction chamber 101 through the exhaust pipe 152, the pressure in the reaction chamber 101 decreases, and the air outside the reaction chamber 101 is sucked into the reaction chamber 101 through the air inlet pipe 151, thereby reducing the hydrogen concentration in the reaction chamber 101.

[0042] The metal lithium waste recovery device provided in the embodiment of the present invention further includes: a filter screen 16, which is arranged in the reactor 10, and divides the inner cavity of the reactor 10 into a reaction chamber 101 located above the filter screen 16 and a recovery chamber 102 located below the filter screen 16; and a discharge pipe 17, which is connected to the recovery chamber 102. Exemplarily, the metal lithium waste is placed in the reaction chamber 101 and supported on the filter screen 16, so that the metal lithium waste can be suspended by the filter screen 16 to avoid local excessive temperature caused by accumulation; when the intelligent sprayer 11 sprays atomized water into the reaction chamber 101, the metal lithium waste reacts with the atomized water, and the generated lithium hydroxide solution passes through the filter screen 16 and is collected in the recovery chamber 102, and the residue after the reaction stays on the filter screen 16, realizing the rapid and effective separation of the residue and the metal lithium compound; when the reaction is completed, the lithium hydroxide solution in the recovery chamber 102 can be discharged through the discharge pipe 17.

[0043] The metal lithium waste recovery device provided in the embodiment of the present invention further includes: a gas storage tank 18 for storing carbon dioxide; and a gas transmission pipe 19, both ends of which are respectively connected to the gas storage tank 18 and the recovery chamber 102. Exemplarily, after the reaction of the metal lithium waste residue and the atomized water in the reaction chamber 101 is completed, the lithium hydroxide solution is collected in the recovery chamber 102, and then the gas storage tank 18 is opened, and the carbon dioxide gas therein is transported to the lithium hydroxide solution in the recovery chamber 102 through the gas transmission pipe 19, and the recovered product lithium carbonate can be obtained after the reaction, and the entire recovery process is completed in one device, thereby improving the recovery efficiency.

[0044] In the embodiment of the present invention, valves with on-off functions may be provided on all pipelines, and the valves are preferably electric valves, such as solenoid valves. All valves are connected to the controller 13 by wire or wireless means, and the controller 13 controls the actions of all valves.

[0045] The metal lithium waste recovery device provided in the embodiment of the present invention, the reactor 10 comprises: a reaction barrel 103, in which a chamber with a top opening is provided; a barrel cover 104, which is sealed and covered at the top opening of the chamber. The filter screen 16 is arranged in the reaction barrel 103 and at a position about 1 / 3 of the distance from the bottom of the barrel; the filter screen 16 divides the inner cavity of the reaction barrel 103 into a reaction chamber 101 located above the filter screen 16 and a recovery chamber 102 located below the filter screen 16. In this embodiment, the air intake pipe 151 and the exhaust pipe 152 are installed on the barrel cover 104. Of course, in other embodiments, the air intake pipe 151 and the exhaust pipe 152 can also be installed at a position near the upper end of the side wall of the reaction barrel 103. The discharge pipe 17 is installed at a position near the lower end of the side wall of the reaction barrel 103. In this embodiment, the spray pipe of the intelligent sprayer 11 passes through the center of the barrel cover 104 so that the spray head is arranged in the middle position of the upper part of the reaction chamber 101. Of course, in other embodiments, the spray pipe of the intelligent sprayer 11 may also pass through the side wall of the reaction barrel 103 near the upper end, and the spray head is set in the middle position of the upper part of the reaction chamber 101.

[0046] In order to reduce the interference of external sounds on the monitor 12 and improve the accuracy of the monitor 12 in monitoring the sound of the reaction between the metal lithium waste and the atomized water in the reaction chamber 101, illustratively, the reactor 10 and all pipelines are wrapped with sound insulation materials. By wrapping the reactor 10 and all pipelines with sound insulation materials, the sound insulation performance of the reactor 10 and all pipelines is improved, and the interference of external sounds on the operation of the monitor 12 is reduced. Exemplarily, the barrel wall of the reaction barrel 103 is at least a two-layer structure. By setting the barrel wall of the reaction barrel 103 to at least a two-layer structure, the sound insulation performance of the barrel wall of the reaction barrel 103 is improved. In this embodiment, the barrel wall of the reaction barrel 103 is a two-layer structure.

[0047] An embodiment of the present invention provides a method for recycling metallic lithium waste, comprising: placing metallic lithium waste in a reaction chamber 101 of a reactor 10, spraying atomized water into the reaction chamber 101 to react with the metallic lithium waste; obtaining a reaction sound between the metallic lithium waste and the atomized water in the reaction chamber 101, and controlling the amount of atomized water sprayed into the reaction chamber 101 according to the size of the reaction sound.

[0048] The metal lithium waste recovery method provided by the embodiment of the present invention monitors the reaction sound of the metal lithium waste and atomized water in the reaction chamber 101 in real time, and then uses the reaction sound of the metal lithium waste and the atomized water to reflect the intensity of the reaction between the metal lithium waste and the atomized water. By feeding back the reaction sound for data analysis, the amount of atomized water sprayed into the reaction chamber 101 is controlled. In this way, intelligent monitoring of the reaction between the metal lithium waste and the atomized water can be achieved, and a dynamic adjustment effect can be played to avoid the situation where the reaction between the metal lithium waste and the atomized water is too intense, thereby solving the problem in the prior art that dangerous situations such as combustion or even explosion may occur due to the excessively intense reaction of the metal lithium waste when dissolved in water, thereby improving the safety of metal lithium waste recovery.

[0049] The control of the amount of water sprayed into the reaction chamber 101 by the atomized water according to the size of the reaction sound includes: when the reaction sound is greater than the maximum safe sound, reducing the amount of water sprayed into the reaction chamber 101 by the atomized water. Under the premise of safe reaction, in order to improve the recovery efficiency, the control of the amount of water sprayed into the reaction chamber 101 by the atomized water according to the size of the reaction sound also includes: when the reaction sound is less than the maximum safe sound - ΔN, increasing the amount of water sprayed into the reaction chamber 101 by the atomized water. Wherein, ΔN is the sound size, the unit is decibel.

[0050] The method for recycling waste lithium metal provided by the embodiment of the present invention further includes: obtaining the current hydrogen concentration in the reaction chamber 101, and when the hydrogen concentration is greater than a preset value, delivering air into the reaction chamber 101. By delivering air into the reaction chamber 101, not only the reaction temperature in the reaction chamber 101 can be reduced, but also the hydrogen concentration in the reaction chamber 101 can be diluted, so that the hydrogen concentration in the reaction chamber 101 is always kept within a safe range, further eliminating the risk of combustion or even explosion, and achieving the effect of safely recycling waste lithium metal.

[0051] Embodiment 1:

[0052] Provide as Figure 1 In the reactor 10 shown, when the metal lithium waste reacts with the atomized water in the reaction chamber 101 of the reactor 10, through test determination, if the reaction sound is less than 50 decibels, it indicates safety; if the reaction sound is between 50 and 65 decibels, it indicates that the warning is adjustable; if the reaction sound is greater than 65 decibels, it indicates danger; if the reaction sound is 0 decibels, it indicates that the reaction is over. The maximum safe sound is set to 50 decibels in the controller 13, and the preset value of the hydrogen concentration is set to 4%.

[0053] 200g of metal lithium waste is placed on the filter 16 in the reactor 10, and the particle size of the fine water mist droplets of the intelligent sprayer 11 is preset to 2mm, and the water spraying speed is 50ml / s; the intelligent sprayer 11 is turned on to spray atomized water into the reaction chamber 101 to react with the metal lithium waste, and the monitor 12 and the hydrogen concentration monitor 14 are turned on at the same time; the monitor 12 monitors the reaction sound of the metal lithium waste and the atomized water in real time, and transmits the reaction sound value to the controller 13; the hydrogen concentration monitor 14 detects the hydrogen concentration in the reaction chamber 101 in real time, and transmits the hydrogen concentration value to the controller 13;

[0054] When the reaction sound is greater than 50 decibels, the controller 13 controls the intelligent sprinkler 11 to reduce the spraying amount of atomized water until the reaction sound is less than or equal to 50 decibels; when the reaction sound is less than 20 decibels, the controller 13 controls the intelligent sprinkler 11 to increase the spraying amount of atomized water until the reaction sound is greater than or equal to 20 decibels; when the hydrogen concentration is greater than 4%, the controller 13 controls the air delivery system 15 to deliver air into the reaction chamber 101 until the hydrogen concentration in the reaction chamber 101 is less than 4%. After the reaction of the metal lithium waste with the atomized water is completed, the carbon dioxide is passed into the lithium hydroxide solution to obtain the recovered product lithium carbonate.

[0055] The above method is used to recycle metallic lithium waste. The entire reaction process is safe and reliable without any combustion or explosion. It only takes 38 minutes from the start of treatment to the completion of recovery, and the recovery efficiency is high.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for recycling waste lithium metal, characterized in that: include: Placing metal lithium waste in a reaction chamber (101) of a reactor (10), and spraying atomized water into the reaction chamber (101) to react with the metal lithium waste; Acquiring the reaction sound between the metal lithium waste and the atomized water in the reaction chamber (101), and controlling the amount of the atomized water sprayed into the reaction chamber (101) according to the magnitude of the reaction sound; The atomized water is a mixture of water and oily substances, and the oily substances do not react with water and metallic lithium.

2. The method for recycling waste lithium metal according to claim 1, characterized in that: The method of controlling the amount of atomized water sprayed into the reaction chamber (101) according to the size of the reaction sound comprises: When the reaction sound is greater than the maximum safe sound, the amount of atomized water sprayed into the reaction chamber (101) is reduced.

3. The method for recycling waste lithium metal according to claim 1, characterized in that: Also includes: The current hydrogen concentration in the reaction chamber (101) is obtained, and when the hydrogen concentration is greater than a preset value, air is delivered into the reaction chamber (101).

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