A lithium slag hydrolysis tail gas treatment device

Abstract

The present invention provides a lithium slag hydrolysis tail gas treatment device. The lithium slag hydrolysis tail gas treatment device comprises a primary water washing tank body, a secondary water washing tank body, a spray dust removal tower and a cyclone separation tower connected in sequence, a water storage tank is formed in the inner cavity connected to the primary water washing tank body and the secondary water washing tank body, the water storage tank is used to store liquid, the primary water tank body is provided with a tail gas inlet connected to the water storage tank, the tail gas enters the primary water washing tank body through the tail gas inlet, and the primary water washing tank body and the secondary water washing tank body are connected above the liquid level by an arched pipe. The lithium slag hydrolysis tail gas treatment device of the present invention has a more compact structure and a more reasonable design; it adopts a comprehensive application of multi-stage water washing, multi-stage spraying and cyclone water and gas separation technologies, and has a good dust removal effect; at the same time, the recycling of water resources makes it possible to use this process without interrupting the dust removal work, so that the hydrolysis can be operated continuously and the tail gas can be discharged up to standard.

Description

Technical Field

[0001] The invention relates to a hydrolysis tail gas treatment device, in particular to a lithium slag hydrolysis tail gas treatment device. Background Art

[0002] The existing lithium metal production process is mainly electrolysis, which is bound to produce a large amount of waste slag. With the increasing demand for lithium metal in many fields such as primary batteries, aerospace materials, medicine, and nuclear industry, the existing lithium metal production capacity is constantly expanding, and the waste slag of electrolytic lithium metal will also increase accordingly.

[0003] At present, there are two main ways to treat electrolytic lithium metal waste residue: oxidation and hydrolysis. Oxidation cannot achieve the maximum recycling of resources and is not in line with the current national policy of energy conservation and emission reduction. Therefore, hydrolysis is still the main treatment for electrolytic lithium waste residue. Hydrolysis is a series of exothermic chemical reactions that easily produce relatively complex gases such as hydrogen and smoke. At present, most lithium metal manufacturers use traditional simple spray dust removal for hydrolysis tail gas treatment. Traditional simple spray dust removal treatment will produce a large amount of spray wastewater, and the entire tail gas treatment is inefficient and discontinuous, and cannot treat the tail gas to the maximum extent. The exhaust gas is even mixed with some smoke and liquid, and dust may even accumulate at the nozzle of the spray device and block the nozzle, which will affect the dust removal effect of the entire process and the normal operation of the equipment, increase the frequency of equipment maintenance, and reduce the service life of the equipment. Summary of the invention

[0004] Based on this, it is necessary to provide a lithium slag hydrolysis tail gas treatment device to address the above problems.

[0005] A lithium slag hydrolysis tail gas treatment device comprises a primary water washing tank body, a secondary water washing tank body, a spray dust removal tower and a cyclone separation tower connected in sequence, a water storage tank is formed in the inner cavity connected to the primary water washing tank body and the secondary water washing tank body, the water storage tank is used to store liquid, a tail gas inlet connected to the water storage tank is opened on the primary water washing tank body, tail gas enters the primary water washing tank body through the tail gas inlet, the primary water washing tank body and the secondary water washing tank body are connected above the liquid level by an arched pipe, the primary water washing tank body and the secondary water washing tank body are in a connected state below the liquid level, the primary water washing tank body and the secondary water washing tank body adopt a partition combination method to achieve gas-liquid separation, the connection between the primary water washing tank body and the secondary water washing tank body, the connection between the gas phase outlet of the secondary water washing tank body and the bottom of the spray dust removal tower, and the connection between the tail gas outlet of the spray dust removal tower and the top of the cyclone separation tower are all tangentially connected.

[0006] Furthermore, the tank wall between the exhaust gas inlet and the water storage tank is trumpet-shaped, a spray head for adjusting the water volume is installed on the first-level water washing tank body, and an inclined baffle is sandwiched between the spray head and the exhaust gas inlet.

[0007] Furthermore, the gas at the outlet of the primary water washing tank body and the top gas of the secondary water washing tank body are connected by the arched pipe, and the liquid fluid at the bottom of the primary water washing tank body and the secondary water washing tank body are in communication.

[0008] Furthermore, the secondary water washing tank body is equipped with the spray head for adjusting the water volume, and the inclined baffle is sandwiched between the spray head and the gas phase outlet. The outer planes of the baffle in the primary water washing tank body and the baffle in the secondary water washing tank body are both serrated planes.

[0009] Furthermore, the spray head in the primary water washing tank body and the spray head in the secondary water washing tank body are both equipped with ball valves.

[0010] Furthermore, a water outlet with a valve is installed at the bottom of the secondary water washing tank body, and the secondary water washing tank body is connected to the side of the spray dust removal tower through a conical pipe from the top opening.

[0011] Furthermore, the spray dust removal tower is connected to the cyclone separation tower through the top, the cyclone separation tower is provided with a fan and an exhaust gas duct, the bottom side of the cyclone separation tower is connected to the fan, and the bottom of the cyclone separation tower is connected to the water storage tank.

[0012] Furthermore, the air outlet of the spray dust removal tower and the air inlet of the cyclone separation tower both enter the spray dust removal tower or the cyclone separation tower in a tangential manner.

[0013] Furthermore, the cyclone separation tower is cylindrical at the upper end and conical at the lower half.

[0014] The lithium slag hydrolysis tail gas treatment device of the present invention has a more compact structure and a more reasonable design; it adopts the comprehensive application of multi-stage water washing, multi-stage spraying and cyclone water-gas separation technologies, and has a good dust removal effect; at the same time, the recycling of water resources makes it possible to use the process without interrupting the dust removal work, so that the hydrolysis can be operated continuously and the tail gas can be discharged up to the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a primary water washing tank body and a secondary water washing tank body of a lithium slag hydrolysis tail gas treatment device of the present invention;

[0016] Figure 2 for Figure 1 The structural schematic diagram of the spray dust removal tower and the cyclone separation tower of the lithium slag hydrolysis tail gas treatment device shown; and

[0017] Figure 3 for Figure 1 The schematic diagram of the structure of the fan and tail gas pipeline of the lithium slag hydrolysis tail gas treatment device is shown.

[0018] The reference numerals in the accompanying drawings are:

[0019] 1- Exhaust gas inlet 2- Ball valve 3- Sprinkler head

[0020] 4- baffle 5- submerged baffle 6- arched pipe

[0021] 7-connecting vessel channel 8-gas phase outlet 9-spray pump

[0022] 10-water outlet 11-spray tower nozzle 12-exhaust channel

[0023] 13- Cyclone separation tower 14- Spray dust removal tower 15- Turbulence ball

[0024] 16- Spray tower baffle 17- Cyclone tower middle section 18- Exhaust air duct

[0025] 19-water supply ball valve 20-water storage tank 21-fan

[0026] 22- tail gas pipeline 23- tail gas discharge port 24- tail gas pipe ball valve. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Please see Figures 1 to 3The present invention provides a lithium slag hydrolysis tail gas treatment device, the lithium slag hydrolysis tail gas treatment device comprises a primary water washing tank body, a secondary water washing tank body, a spray dust removal tower 14 and a cyclone separation tower 13 connected in sequence, a water storage tank 20 is formed in the inner cavity connected to the primary water washing tank body and the secondary water washing tank body, the water storage tank is used to store liquid, the primary water washing tank body is provided with a tail gas inlet 1 connected to the water storage tank, the tail gas enters the primary water washing tank body through the tail gas inlet, the primary water washing tank body and The liquid level in the secondary water washing tank is connected by an arch pipe 6, and the liquid level in the primary water washing tank and the secondary water washing tank is connected by a connecting passage 7. The primary water washing tank and the secondary water washing tank are separated by gas and liquid by a partition combination. The connection between the primary water washing tank and the secondary water washing tank, the connection between the gas phase outlet 8 of the secondary water washing tank and the bottom of the spray dust removal tower, and the connection between the tail gas duct 18 of the spray dust removal tower and the top of the cyclone separation tower are all tangentially connected. Specifically, the tail gas duct 18 of the spray dust removal tower is connected to the tail gas duct 22 at the top of the cyclone separation tower, and the spray dust removal tower is provided with a tail gas discharge port 23 and a tail gas pipe ball valve 24.

[0031] The tank wall between the tail gas inlet and the water storage tank 20 is trumpet-shaped, and a spray head 3 for adjusting the water volume is installed on the primary water washing tank body, and an inclined baffle 4 is sandwiched between the spray head and the tail gas inlet. The spray head 3 for adjusting the water volume is installed on the secondary water washing tank body, and an inclined baffle 4 is sandwiched between the spray head and the gas phase outlet.

[0032] A water outlet 10 with a valve is installed at the bottom of the secondary water washing tank body, and the secondary water washing tank body is connected to the side of the spray dust removal tower through a conical pipe from the top opening.

[0033] In this embodiment, the air outlet of the spray dust removal tower and the air inlet of the cyclone separation tower both enter the spray dust removal tower or the cyclone separation tower in a tangential manner. The spray dust removal tower is connected to the cyclone separation tower through the top, and a fan 21 and an exhaust gas pipeline 22 are provided in the cyclone separation tower. The bottom side of the cyclone separation tower is connected to the fan, and the bottom of the cyclone separation tower is connected to the water storage tank. In this embodiment, a spray pump 9 is provided on the side of the cyclone separation tower close to the gas phase outlet 8, and the installation position of the spray pump 9 is located below the gas phase outlet 8. In this embodiment, an exhaust gas channel 12 is formed above the spray dust removal tower and the cyclone separation tower.

[0034] Specifically, the hydrolyzed tail gas enters the primary water washing tank body from the tail gas inlet 1 of the primary water washing tank body. Under the action of the baffle 4 of the primary water washing tank body, the tail gas contacts water for the first time. After passing through the baffle 4, the tail gas will be rinsed by the spray head 3 of the primary water washing tank body, and then enters the secondary water washing tank body through the arch pipe 6. The tail gas contacts the liquid surface of the washing tank for the second time under the guidance of the baffle 4 of the secondary water washing tank body. After passing through the baffle 4 of the secondary water washing tank body, it is rinsed by the spray head 3 of the secondary water washing tank body. The tail gas after the first and second water washings enters the spray dust removal tower 14 from the air outlet pipe at the top of the secondary water washing tank body through the bottom side of the spray dust removal tower 14. The tail gas enters the spray dust removal tower 14 and passes through the spray tower baffle 16 under the action of the turbulent ball 15 in the spray dust removal tower 14. The elution time of the exhaust gas and the washing liquid is prolonged, and at the same time, the elution area of ​​the exhaust gas and the washing liquid is also increased under the continuous rolling of the turbulent ball 15. After the exhaust gas passes through the turbulent ball 15, it will be further sprayed and dusted under the action of the spray tower nozzle 11. The exhaust gas is discharged from the top of the spray dust removal tower 14 and passes through the conical tower body of the middle section 17 of the cyclone tower from the top of the cyclone separation tower 13. The cyclone separation tower 13 is provided with a water replenishment ball valve 19. The exhaust gas in the cyclone separation tower 13 will form a cyclone inside the cyclone separation tower 13 under the action of the fan 21. After the exhaust gas passes through the cyclone in the cyclone separation tower 13, the heavy droplets and smoke enter the water storage tank 20 from the bottom channel of the cyclone separation tower 13, while the light exhaust gas is pumped by the fan through the bottom side wall pipe of the cyclone separation tower 13 to the smoke outlet 23 for discharge. Compared with the prior art, the lithium slag hydrolysis tail gas treatment device of the present invention has the following advantages: it can purify tail gas more effectively and to a greater extent, water resources can be recycled and reused, and no waste water is generated in the whole process.

[0035] It can be understood that the aqueous solutions of the primary water washing tank, the secondary water washing tank, the spray dust removal tower and the cyclone separation tower are replaced regularly, the hydrolysis process hydrolysis tank is also pumped into the primary water washing tank and the secondary water washing tank, and the liquids of the spray dust removal tower and the cyclone separation tower are regularly pumped into the water washing tank, and no wastewater is generated throughout the process.

[0036] A lithium slag hydrolysis tail gas treatment device of the present invention, based on the technical solution described above, can also be: the surfaces of the baffle 4 and the submerged baffle 5 are made into serrated protrusions. When the water sprayed by the spray head 3 and the spray tower nozzle 11 falls on the surface of the baffle 4 and the submerged baffle 5, the water flow path will be changed under the guidance and blocking of the serrated structure and a layer of water mist will be formed, which will greatly increase the contact area between the tail gas and the spray washing liquid, and will more effectively purify the tail gas and remove the solid smoke particles in the tail gas.

[0037] The lithium slag hydrolysis tail gas treatment device of the present invention is based on the technical solution described above, please refer to Figures 1 to 3 It can also be that: the spray heads 3 of the primary and secondary water washing tanks are equipped with the ball valve 2, and the spray water flow speed and flow rate of the spray head 3 can be controlled by the ball valve 2, so as to achieve the best washing effect of the exhaust gas and save water energy to the greatest extent.

[0038] The lithium slag hydrolysis tail gas treatment device of the present invention is based on the technical solution described above, please refer to Figures 1 to 3 , or it can be: the cyclone separation tower 13 is cylindrical at the upper end and conical at the lower half, the top opening is used as an air inlet, the conical bottom opening at the lower end is a smoke discharge port, and the bottom side wall opening is a purified exhaust gas extraction port. When the hydrolyzed exhaust gas enters from the top air inlet of the cyclone separation tower 13, the exhaust gas enters the cyclone separation tower. Under the action of the fan 21, the exhaust gas forms a cyclone in the cyclone separation tower 13 due to the conical barrel body, and then the heavy smoke will enter the water storage tank 20 through the bottom outlet of the cyclone separation tower 13, and the separated exhaust gas is pumped to the exhaust gas pipe 22 for external discharge through the bottom side wall outlet pipe of the cyclone separation tower 13.

[0039] The high-purity lithium metal discharge device of the present invention has a more compact structure and a more reasonable design; it adopts the comprehensive application of multi-stage water washing, multi-stage spraying and cyclone water-gas separation technologies, and has a good dust removal effect; at the same time, the recycling of water resources makes it possible to use the process without interrupting the dust removal work, so that the hydrolysis can be operated continuously and the tail gas can be discharged up to the standard.

[0040] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A lithium slag hydrolysis tail gas treatment device, characterized in that: The invention comprises a primary water washing tank body, a secondary water washing tank body, a spray dust removal tower and a cyclone separation tower connected in sequence, a water storage tank is formed in the inner cavity connected to the primary water washing tank body and the secondary water washing tank body, the water storage tank is used to store liquid, an exhaust gas inlet connected to the water storage tank is opened on the primary water washing tank body, the exhaust gas enters the primary water washing tank body through the exhaust gas inlet, the primary water washing tank body and the secondary water washing tank body are connected above the liquid level by an arched pipe, the primary water washing tank body and the secondary water washing tank body are connected below the liquid level, the primary water washing tank body and the secondary water washing tank body are in a connected state, and the primary water washing tank body is connected to the secondary water washing tank body. The washing tank body and the secondary washing tank body adopt a partition combination method to achieve gas-liquid separation. The connection between the primary washing tank body and the secondary washing tank body, the connection between the gas phase outlet of the secondary washing tank body and the bottom of the spray dust removal tower, and the connection between the tail gas outlet of the spray dust removal tower and the top of the cyclone separation tower are all tangentially connected; the tank wall between the tail gas inlet and the water storage tank is trumpet-shaped, and a spray head for adjusting the water volume is installed on the primary washing tank body, and an inclined baffle is sandwiched between the spray head and the tail gas inlet; the outlet of the primary washing tank body and the The gas at the top of the secondary water washing tank is connected with the arched pipe, and the liquid fluid at the bottom of the primary water washing tank and the secondary water washing tank flows; the secondary water washing tank is equipped with the spray head for adjusting the water volume, and an inclined baffle is sandwiched between the spray head and the gas phase outlet, and the outer planes of the baffle in the primary water washing tank and the baffle in the secondary water washing tank are both serrated planes; the spray head in the primary water washing tank and the spray head in the secondary water washing tank are both equipped with a ball valve; the bottom of the secondary water washing tank is equipped with a There is a water outlet with a valve, and the secondary water washing tank body is connected to the side of the spray dust removal tower through a conical pipe from the top opening; the spray dust removal tower is connected to the cyclone separation tower through the top, and the cyclone separation tower is provided with a fan and an exhaust gas pipe, the bottom side of the cyclone separation tower is connected to the fan, and the bottom of the cyclone separation tower is connected to the water storage tank; the air outlet of the spray dust removal tower and the air inlet of the cyclone separation tower both enter the spray dust removal tower or the cyclone separation tower in a tangential manner; the cyclone separation tower is cylindrical at the upper end and conical at the lower half.

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