Recycling device for cobaltosic oxide production tail gas
By designing a system of alkali spraying, exhaust gas absorption and filtration components, the recovery of ammonia and cobalt powder in the exhaust gas during the production of cobalt tetroxide is solved, and effective recovery of exhaust gas resources and environmental purification are achieved.
Patent Information
- Application Number
- CN202420574194.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-22
AI Technical Summary
During the production process of cobalt tetroxide, the ammonia and entrained cobalt powder in the exhaust gas were not effectively recovered, resulting in waste of resources and environmental pollution.
A recycling and treatment device including alkali spraying assembly, exhaust gas absorption assembly and filtration assembly was designed. The sodium hydroxide solution is fully in contact with the exhaust through the spray tower and circulation pipeline system to form pure ammonia and pass through the absorbing liquid. Carbon dioxide and cobalt powder are recycled to produce ammonium bicarbonate and cobalt powder are recovered.
The effective recycling and utilization of the exhaust gas produced by cobalt tetroxide has been achieved, the emission of ammonia and carbon dioxide is avoided, the reuse of resources is improved, and environmental pollution is reduced.
Smart Images
Figure CN222151501U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of lithium batteries, and in particular to a device for recovering and treating tail gas from the production of cobalt tetroxide. Background Art
[0002] Lithium cobalt oxide occupies an important position in lithium-ion cathode materials for 3C portable electronic products. As the main raw material for the production of lithium cobalt oxide, the preparation of Co3O4 is particularly important. The most commonly used and most obvious method is to prepare the high-performance precursor CoCo3 by liquid phase precipitation, and then calcine it into Co3O4 particles. The reaction equation in the synthesis stage is: CoCl2+2NH4HCO3=CoCO3↓+2NH4Cl+CO2↑+H2O; the reaction equation in the calcination stage is: 6CoCO3+O2=2Co3O4+6CO2. The CO2 produced in the two stages and the NH3 produced by hydrolysis and other gases discharged into the atmosphere will aggravate the greenhouse effect and environmental pollution.
[0003] For example, the Chinese patent with patent number CN201720631676.X proposes a device for calcining and recovering carbon dioxide during the production of cobalt trioxide, including an air intake hood arranged on a calcining furnace, an induced draft fan is arranged outside the air intake hood and connected by a pipeline, the other end of the induced draft fan is connected to a gas booster through a pipeline, the gas booster is connected to a pressure swing adsorption deoxygenation system through a pipeline, the pressure swing adsorption deoxygenation system is connected to a carbon dioxide storage tank through a pipeline, the gas outlet of the carbon dioxide storage tank is connected to a carbon dioxide compressor, and the gas outlet of the carbon dioxide compressor is connected to a gas-liquid separator on an ammonium bicarbonate production line. The device effectively recovers carbon dioxide from calcination and recovery during the production of cobalt trioxide, avoiding a large amount of carbon dioxide from polluting the air, and at the same time, the carbon dioxide is used as a raw material for synthesizing ammonium bicarbonate solution, and is applied to the synthesis process of cobalt carbonate, saving costs, and the overall practicality is very strong.
[0004] However, the above-mentioned device for calcining and recovering carbon dioxide in the production process of cobalt tetroxide has the following problems:
[0005] Although the carbon dioxide produced by calcination in the production process of cobalt tetroxide can be effectively recovered, the ammonia produced in the production process of cobalt tetroxide is not recycled, and ammonia is also the raw material for synthesizing ammonium bicarbonate solution, which will cause waste of resources and environmental pollution. Secondly, the carbon dioxide gas in the calcination will carry some cobalt powder, which is not recycled, resulting in waste of resources.
[0006] Therefore, how to recycle the tail gas from the production of cobalt tetroxide and recover the cobalt powder entrained in the tail gas is an urgent problem that needs to be solved. Utility Model Content
[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a cobalt tetroxide production tail gas recovery and treatment device that can recycle cobalt tetroxide production tail gas and recover cobalt powder entrained in the tail gas.
[0008] The purpose of this disclosure is achieved through the following technical solutions:
[0009] A device for recovering and treating tail gas from the production of cobalt trioxide, comprising:
[0010] An alkali spray assembly, the alkali spray assembly comprising a first spray tower, a first circulation pipeline and a plurality of first spray parts, the air inlet end of the first spray tower is respectively connected to the tail gas discharge end of the carbon ammonium room and the tail gas discharge end of the cobalt carbonate synthesis reactor, the liquid inlet end of the first circulation pipeline is connected to the liquid outlet end of the first spray tower, and the plurality of first spray parts are evenly arranged in the first spray tower along the air inlet direction, and the liquid inlet end of each of the first spray parts is connected to the liquid outlet end of the first circulation pipeline;
[0011] A tail gas absorption component, the tail gas absorption component includes a second spray tower, a second circulation pipeline and a plurality of second spray parts, the air inlet end of the second spray tower is connected with the air outlet end of the first spray tower and the tail gas discharge end of the four-cobalt rotary kiln, the liquid inlet end of the second circulation pipeline is connected with the liquid outlet end of the second spray tower, and the plurality of second spray parts are evenly arranged in the second spray tower along the air inlet direction, and the liquid inlet end of each second spray part is connected with the liquid outlet end of the second circulation pipeline;
[0012] A filter assembly, wherein the liquid inlet end of the filter assembly is connected to the liquid outlet end of the second spray tower, and the material outlet end of the filter assembly is connected to the material feed end of the ceramic cobalt rotary kiln.
[0013] In one embodiment, the alkali spray assembly further comprises an air filter, and the air filter is disposed on a pipeline connecting the first spray tower and the ammonium carbonate complex.
[0014] In one embodiment, the first circulation pipeline includes a first main pipeline, a first circulation pump and a plurality of first branch pipelines, the liquid inlet end of the first main pipeline is connected to the liquid outlet end of the first spray tower, the first circulation pump is arranged on the first main pipeline, the liquid outlet end of the first main pipeline is respectively connected to the liquid inlet ends of the plurality of first branch pipelines, and the liquid outlet end of each first branch pipeline is connected to the liquid inlet end of the corresponding first spray component.
[0015] In one embodiment, the alkaline spray assembly also includes a sodium hydroxide adding pipe, a first drain pipe and a first drain pump, the liquid outlet end of the sodium hydroxide adding pipe is connected to the liquid inlet end of the first main pipe, the liquid inlet end of the first drain pipe is connected to the liquid outlet end of the first spray tower, the liquid outlet end of the first drain pipe is connected to the alkaline washing liquid recovery and processing device, and the first drain pump is arranged on the first drain pipe.
[0016] In one embodiment, the second circulation pipeline includes a second main pipeline, a second circulation pump and a plurality of second branch pipelines, the liquid inlet end of the second main pipeline is connected to the liquid outlet end of the second spray tower, the second circulation pump is arranged on the second main pipeline, the liquid outlet end of the second main pipeline is respectively connected to the liquid inlet ends of the plurality of second branch pipelines, and the liquid outlet end of each second branch pipeline is connected to the liquid inlet end of the corresponding second spray component.
[0017] In one embodiment, the tail gas absorption component also includes a liquid replenishment main pipeline, a low-salt wastewater liquid addition pipeline and an ammonia water liquid addition pipeline. The liquid outlet end of the liquid replenishment main pipeline is connected to the liquid inlet end of the second spray tower, and the liquid inlet end of the liquid replenishment main pipeline is respectively connected to the liquid outlet end of the low-salt wastewater liquid addition pipeline and the liquid outlet end of the ammonia water liquid addition pipeline.
[0018] In one embodiment, the second spray tower is provided with an overflow drain port;
[0019] The tail gas absorption component also includes an overflow drainage pipe, the liquid inlet end of the overflow drainage pipe is connected to the overflow drainage port, and the liquid outlet end of the overflow drainage pipe is connected to the liquid inlet end of the filter component.
[0020] In one of the embodiments, the tail gas absorption component further includes a bicarbonate ion detector, and the bicarbonate ion detector is disposed on the overflow drainage pipe.
[0021] In one embodiment, the filtration component includes a filter press and a security filter, the liquid inlet end of the filter press is connected to the liquid outlet end of the overflow drainage pipe, the discharge end of the filter press is connected to the feed end of the ceramic cobalt rotary kiln, and the liquid inlet end of the security filter is connected to the liquid outlet end of the filter press.
[0022] In one embodiment, the filter assembly also includes a second drainage pipe, a second drainage pump and a wash water storage tank, the liquid inlet end of the second drainage pipe is connected to the liquid outlet end of the security filter, the second drainage pump is arranged on the second drainage pipe, and the liquid inlet end of the wash water storage tank is connected to the liquid outlet end of the second drainage pipe.
[0023] Compared with the prior art, the present invention has at least the following advantages:
[0024] 1. The tail gas generated in the ammonium carbonate room and the cobalt carbonate synthesis reactor is transported to the first spray tower, and the sodium hydroxide solution in the first spray tower is transported to multiple first spray parts through the first circulation pipeline and output by multiple first spray parts, so that the sodium hydroxide solution is fully in contact with the tail gas, and the carbon dioxide and solid particles in the tail gas can be removed to form pure ammonia.
[0025] 2. Pure ammonia and tail gas generated by the tetracobalt rotary kiln are transported to the second spray tower. The absorption liquid in the second spray tower is transported to multiple second spray parts through the second circulation pipeline and output by the multiple second spray parts, so that the pure ammonia and tail gas can fully contact with the absorption liquid, not only can the pure ammonia be absorbed and utilized, but also the carbon dioxide in the tail gas can be absorbed and reacted to generate ammonium bicarbonate. At the same time, the cobalt powder entrained in the tail gas of the tetracobalt rotary kiln is washed away by the absorption liquid, so that the tail gas of the cobalt tetroxide production can be recovered and reused, avoiding the situation that the ammonia and carbon dioxide generated in the cobalt tetroxide production process are discharged into the atmosphere.
[0026] 3. The absorption liquid in the second spray tower is subjected to multiple cycles of absorption treatment in the second circulation pipeline to form an ammonium bicarbonate mixed slurry. The ammonium bicarbonate mixed slurry is transported from the second spray tower to the filter assembly for filtering operation. The generated ammonium bicarbonate filtrate can be reused as a production raw material for cobalt tetroxide, and the generated cobalt powder filter residue is transported by the filter assembly to the ceramic cobalt rotary kiln for cobalt powder recovery treatment, thereby realizing the recovery and reuse of tail gas resources and recovering the cobalt powder entrained in the tail gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0028] Figure 1 This is a schematic diagram of the structure of a recovery device for tail gas produced by cobalt tetroxide in one embodiment;
[0029] Figure 2 for Figure 1 A schematic diagram of the partial structure of the alkali spray assembly of the recovery device for tail gas from the production of cobalt tetroxide is shown;
[0030] Figure 3 for Figure 1 A schematic diagram of the partial structure of the tail gas absorption component of the recovery device for tail gas produced by cobalt tetroxide is shown;
[0031] Figure 4for Figure 1 A partial structural schematic diagram of a filter assembly of a recovery device for tail gas from cobalt tetroxide production is shown;
[0032] Figure 1: Cobalt oxide production tail gas recovery and treatment device 10; alkali spray assembly 100; first spray tower 110; first circulation pipeline 120; first main pipeline 1210; first circulation pump 1220; first branch pipeline 1230; first spray element 130; air filter 140; sodium hydroxide liquid addition pipeline 150; first drainage pipeline 160; first drainage pump 170; tail gas absorption assembly 200; second spray tower 210; second circulation pipeline 220; second main pipeline 221 ... branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 1230; first branch pipeline 123 Second circulation pump 2220; second branch pipeline 2230; second spray part 230; main liquid replenishment pipeline 240; low-salt wastewater adding pipeline 250; ammonia water adding pipeline 260; overflow drainage pipeline 270; bicarbonate ion detector 280; filter assembly 300; filter press 310; safety filter 320; second drainage pipeline 330; second drainage pump 340; wash water storage tank 350; ammonium carbonate preparation room 400; cobalt carbonate synthesis reactor 500; tetracobalt rotary kiln 600; ceramic cobalt rotary kiln 700. DETAILED DESCRIPTION
[0033] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure 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 disclosure of the present disclosure more thoroughly and comprehensively understood.
[0034] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0036] See also Figures 1 to 4In order to better understand the cobalt tetroxide production tail gas recovery and treatment device 10 disclosed in the present invention, the cobalt tetroxide production tail gas recovery and treatment device 10 is further explained below:
[0037] The recovery and treatment device 10 for tail gas produced by cobalt tetroxide in one embodiment includes an alkali spray assembly 100, a tail gas absorption assembly 200 and a filter assembly 300. The alkali spray assembly 100 includes a first spray tower 110, a first circulation pipeline 120 and a plurality of first spray parts 130, the air inlet end of the first spray tower 110 is respectively connected to the tail gas discharge end of the carbon ammonium room 400 and the tail gas discharge end of the cobalt carbonate synthesis reactor 500, the liquid inlet end of the first circulation pipeline 120 is connected to the liquid outlet end of the first spray tower 110, and the plurality of first spray parts 130 are connected along the air inlet direction (such as Figure 2 The tail gas absorption assembly 200 includes a second spray tower 210, a second circulation pipeline 220 and a plurality of second spray parts 230. The air inlet end of the second spray tower 210 is connected to the air outlet end of the first spray tower 110 and the tail gas discharge end of the tetracobalt rotary kiln 600. The liquid inlet end of the second circulation pipeline 220 is connected to the liquid outlet end of the second spray tower 210. The plurality of second spray parts 230 are arranged in the air inlet direction (such as Figure 3 The Y) is evenly arranged in the second spray tower 210, and the liquid inlet end of each second spray member 230 is connected to the liquid outlet end of the second circulation pipeline 220. The liquid inlet end of the filter assembly 300 is connected to the liquid outlet end of the second spray tower 210, and the material outlet end of the filter assembly 300 is connected to the material feed end of the ceramic cobalt rotary kiln 700.
[0038] In this embodiment, the exhaust gas generated by the ammonium carbonate room 400 and the cobalt carbonate synthesis reactor 500 is transported to the first spray tower 110, and the sodium hydroxide solution in the first spray tower 110 is transported to the multiple first spray parts 130 through the first circulation pipeline 120, and output by the multiple first spray parts 130, so that the sodium hydroxide solution is fully in contact with the exhaust gas, carbon dioxide and solid particles in the exhaust gas can be removed and pure ammonia is formed.
[0039] Furthermore, pure ammonia and tail gas generated by the tetracobalt rotary kiln 600 are transported to the second spray tower 210, and the absorption liquid in the second spray tower 210 is transported to the plurality of second spray parts 230 through the second circulation pipeline 220, and output by the plurality of second spray parts 230, so that the pure ammonia and tail gas can fully contact with the absorption liquid, not only can the pure ammonia be absorbed and utilized, but also the carbon dioxide in the tail gas can be absorbed and reacted to generate ammonium bicarbonate, and at the same time, the cobalt powder entrained in the tail gas of the tetracobalt rotary kiln 600 is washed away by the absorption liquid, so that the tail gas produced by the cobalt tetroxide production can be recovered and reused, avoiding the occurrence of ammonia and carbon dioxide generated in the cobalt tetroxide production process being discharged into the atmosphere.
[0040] Furthermore, the absorption liquid in the second spray tower 210 is subjected to multiple cycles of absorption treatment through the second circulation pipeline 220 to form an ammonium bicarbonate mixed slurry, and the ammonium bicarbonate mixed slurry is transported from the second spray tower 210 to the filter component 300 for filtering operation. The generated ammonium bicarbonate filtrate can be reused as a production raw material for cobalt tetroxide, and the generated cobalt powder filter residue is transported by the filter component 300 to the ceramic cobalt rotary kiln 700 for cobalt powder recovery treatment, thereby realizing the recovery and reuse of tail gas resources and recovering the cobalt powder entrained in the tail gas.
[0041] like Figure 2 As shown, in one embodiment, the alkali spray assembly 100 further includes an air filter 140, and the air filter 140 is disposed on a pipeline connecting the first spray tower 110 and the ammonium bicarbonate preparation room 400. It should be noted that the ammonium bicarbonate preparation room 400 is used to prepare an ammonium bicarbonate solution, and dust, oil and other impurities will be generated during the preparation process. The air filter 140 can filter out the dust, oil and other impurities to obtain pure air and ammonia.
[0042] like Figure 2 As shown, in one embodiment, the first circulation pipeline 120 includes a first main pipeline 1210, a first circulation pump 1220 and a plurality of first branch pipelines 1230, the liquid inlet end of the first main pipeline 1210 is connected to the liquid outlet end of the first spray tower 110, the first circulation pump 1220 is arranged on the first main pipeline 1210, the liquid outlet end of the first main pipeline 1210 is respectively connected to the liquid inlet ends of the plurality of first branch pipelines 1230, and the liquid outlet end of each first branch pipeline 1230 is connected to the liquid inlet end of the corresponding first spray part 130. It can be understood that by controlling the first circulation pump 1220, the sodium hydroxide solution in the first spray tower 110 can be circulated and sprayed, so that the sodium hydroxide solution in the first spray tower 110 is fully in contact with the tail gas, so that the carbon dioxide and solid particles in the tail gas can be removed and pure ammonia can be formed, so as to ensure that there are no impurities in the subsequent ammonium bicarbonate filtrate and the cobalt powder recovered by calcination in the ceramic cobalt rotary kiln 700.
[0043] like Figure 2 As shown, in one embodiment, the alkali spray assembly 100 also includes a sodium hydroxide adding pipe 150, a first drain pipe 160 and a first drain pump 170, the liquid outlet end of the sodium hydroxide adding pipe 150 is connected to the liquid inlet end of the first main pipe 1210, the liquid inlet end of the first drain pipe 160 is connected to the liquid outlet end of the first spray tower 110, the liquid outlet end of the first drain pipe 160 is connected to the alkali washing liquid recovery and processing device, and the first drain pump 170 is arranged on the first drain pipe 160. It should be noted that, as the number of cycles of the sodium hydroxide solution in the first spray tower 110 increases, the concentration of sodium hydroxide gradually decreases. At this time, the first drainage pump 170 is started to transport the alkali washing mixed slurry in the first spray tower 110 from the first drainage pipe 160 to the alkali washing liquid recovery and processing device for recovery and processing. After the alkali washing mixed slurry in the first spray tower 110 is completely discharged, the first drainage pump 170 is closed, and the sodium hydroxide solution is added to the first spray tower 110 through the sodium hydroxide addition pipe 150.
[0044] It should be noted that the cobalt carbonate synthesis reactor 500 will produce a small amount of carbon dioxide gas and a small amount of solid impurities such as NH4Cl, CoCl2, NH4HCO3, etc. After being circulated and sprayed by the sodium hydroxide solution in the first spray tower 110, this part of the carbon dioxide gas can be absorbed and the solid impurities can be flushed away, and this part of the alkali washing mixed slurry can be recycled and reused by the alkali washing recovery treatment device.
[0045] like Figure 3 As shown, in one embodiment, the second circulation pipeline 220 includes a second main pipeline 2210, a second circulation pump 2220 and a plurality of second branch pipelines 2230, the liquid inlet end of the second main pipeline 2210 is connected to the liquid outlet end of the second spray tower 210, the second circulation pump 2220 is arranged on the second main pipeline 2210, the liquid outlet end of the second main pipeline 2210 is respectively connected to the liquid inlet ends of the plurality of second branch pipelines 2230, and the liquid outlet end of each second branch pipeline 2230 is connected to the liquid inlet end of the corresponding second spray part 230. It should be noted that, by controlling the second circulation pump 2220, the absorption liquid in the second spray tower 210 can be circulated and sprayed, so that the absorption liquid in the second spray tower 210 can fully contact with the exhaust gas, which can not only absorb pure ammonia to form ammonia water, but also absorb the carbon dioxide in the calcination exhaust gas and react to form ammonium bicarbonate, and the cobalt powder entrained in the calcination exhaust gas is also washed away by the absorption liquid, thereby avoiding the ammonia and carbon dioxide generated in the cobalt tetroxide production process from being discharged into the atmosphere, and also avoiding the cobalt powder from being discharged into the atmosphere along with the exhaust gas.
[0046] like Figures 1 to 3 As shown, in one embodiment, the tail gas absorption component 200 also includes a liquid replenishment main pipeline 240, a low-salt wastewater adding pipeline 250 and an ammonia adding pipeline 260, the liquid outlet end of the liquid replenishment main pipeline 240 is connected to the liquid inlet end of the second spray tower 210, and the liquid inlet end of the liquid replenishment main pipeline 240 is respectively connected to the liquid outlet end of the low-salt wastewater adding pipeline 250 and the liquid outlet end of the ammonia adding pipeline 260. It should be noted that the low-salt wastewater here refers to the flushing liquid produced during the flushing process of the filter press equipment in the cobalt carbonate synthesis process. The low-salt wastewater is transported to the second spray tower 210 through the low-salt wastewater feeding pipe 250 for wastewater recycling. At this time, the low-salt wastewater, as a solvent, can fully absorb the pure ammonia produced by the first spray tower 110. A small amount of ammonia is supplemented through the ammonia feeding pipe 260 and transported to the second spray tower 210 to form an absorption liquid. This ensures that the carbon dioxide in the exhaust gas can be fully absorbed and ammonium bicarbonate is produced. Ammonium bicarbonate is one of the raw materials for the synthesis of cobalt tetroxide, thereby realizing the recycling and reuse of cobalt tetroxide production exhaust gas resources.
[0047] It should be noted that NH3 dissolves in the absorption liquid to form monohydrated ammonia, which then reacts with CO2. The chemical reaction equation is: 2NH3·H2O+CO2=(NH4)2CO3+H2O; (NH4)2CO3+CO2+H2O=2NH4HCO3.
[0048] like Figure 3 and Figure 4 As shown, in one embodiment, the second spray tower 210 is provided with an overflow drain port. The tail gas absorption assembly 200 further includes an overflow drain pipe 270, the liquid inlet end of the overflow drain pipe 270 is connected to the overflow drain port, and the liquid outlet end of the overflow drain pipe 270 is connected to the liquid inlet end of the filter assembly 300. It should be noted that after the absorption liquid is sprayed for multiple cycles, the liquid level rises and an ammonium bicarbonate mixed slurry is formed, which is then transported to the filter assembly 300 through the overflow drain pipe 270 for filtering.
[0049] like Figure 3As shown, in one embodiment, the tail gas absorption assembly 200 further includes a bicarbonate ion detector 280, which is arranged on the overflow drainage pipe 270. It should be noted that by installing the bicarbonate ion detector 280 on the overflow drainage pipe 270, the bicarbonate ion concentration is monitored, and the feed flow rate of the absorbent is adjusted according to the value. The bicarbonate ion concentration is the concentration of the washing water in the front-end cobalt carbonate synthesis process, which is adjusted according to the cobalt carbonate production demand. If the bicarbonate ion concentration value is too large, the flow rate of the low-salt wastewater inlet and the ammonia water inlet is increased, and the valve opening of the second circulation pump 2220 is increased. If the bicarbonate ion concentration value is too small, the flow rate of the low-salt wastewater inlet and the ammonia water inlet is reduced.
[0050] like Figure 4 As shown, in one embodiment, the filter assembly 300 includes a filter press 310 and a security filter 320, the liquid inlet end of the filter press 310 is connected to the liquid outlet end of the overflow drainage pipe 270, the material outlet end of the filter press 310 is connected to the material feed end of the ceramic cobalt rotary kiln 700, and the liquid inlet end of the security filter 320 is connected to the liquid outlet end of the filter press 310. It should be noted that the ammonium bicarbonate mixed slurry is separated into solid and liquid by the filter press 310, the filtrate is transported to the security filter 320 for secondary filtration and then returned to the front-end cobalt carbonate synthesis process for reuse, and the filter residue is transported to the ceramic cobalt rotary kiln 700 for calcination, which can improve the recovery rate of cobalt metal.
[0051] like Figure 4 As shown, in one embodiment, the filter assembly 300 further includes a second drainage pipe 330, a second drainage pump 340 and a wash water storage tank 350, the liquid inlet end of the second drainage pipe 330 is connected to the liquid outlet end of the security filter 320, the second drainage pump 340 is arranged on the second drainage pipe 330, and the liquid inlet end of the wash water storage tank 350 is connected to the liquid outlet end of the second drainage pipe 330. It should be noted that the filtrate after secondary filtration by the security filter 320 is transported to the wash water storage tank 350 through the second drainage pipe 330 for storage and standby.
[0052] Compared with the prior art, the present invention has at least the following advantages:
[0053] 1. The tail gas generated in the ammonium carbonate room and the cobalt carbonate synthesis reactor is transported to the first spray tower, and the sodium hydroxide solution in the first spray tower is transported to multiple first spray parts through the first circulation pipeline and output by multiple first spray parts, so that the sodium hydroxide solution is fully in contact with the tail gas, and the carbon dioxide and solid particles in the tail gas can be removed to form pure ammonia.
[0054] 2. Pure ammonia and tail gas generated by the tetracobalt rotary kiln are transported to the second spray tower. The absorption liquid in the second spray tower is transported to multiple second spray parts through the second circulation pipeline and output by the multiple second spray parts, so that the pure ammonia and tail gas can fully contact with the absorption liquid, not only can the pure ammonia be absorbed and utilized, but also the carbon dioxide in the tail gas can be absorbed and reacted to generate ammonium bicarbonate. At the same time, the cobalt powder entrained in the tail gas of the tetracobalt rotary kiln is washed away by the absorption liquid, so that the tail gas of the cobalt tetroxide production can be recovered and reused, avoiding the situation that the ammonia and carbon dioxide generated in the cobalt tetroxide production process are discharged into the atmosphere.
[0055] 3. The absorption liquid in the second spray tower is subjected to multiple cycles of absorption treatment in the second circulation pipeline to form an ammonium bicarbonate mixed slurry. The ammonium bicarbonate mixed slurry is transported from the second spray tower to the filter assembly for filtering operation. The generated ammonium bicarbonate filtrate can be reused as a production raw material for cobalt tetroxide, and the generated cobalt powder filter residue is transported by the filter assembly to the ceramic cobalt rotary kiln for cobalt powder recovery treatment, thereby realizing the recovery and reuse of tail gas resources and recovering the cobalt powder entrained in the tail gas.
[0056] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.
Claims
1. A cobalt tetraoxide production tail gas recovery and treatment device (10), characterized in that: include: An alkali spray assembly (100), the alkali spray assembly (100) comprising a first spray tower (110), a first circulation pipeline (120) and a plurality of first spray parts (130), the air inlet end of the first spray tower (110) being respectively connected to the tail gas discharge end of the carbon ammonium compounding room (400) and the tail gas discharge end of the cobalt carbonate synthesis reactor (500), the liquid inlet end of the first circulation pipeline (120) being connected to the liquid outlet end of the first spray tower (110), the plurality of first spray parts (130) being evenly arranged in the first spray tower (110) along the air inlet direction, and the liquid inlet end of each of the first spray parts (130) being connected to the liquid outlet end of the first circulation pipeline (120); A tail gas absorption component (200), the tail gas absorption component (200) comprising a second spray tower (210), a second circulation pipeline (220) and a plurality of second spray elements (230), the air inlet end of the second spray tower (210) being in communication with the air outlet end of the first spray tower (110) and the tail gas discharge end of the tetracobalt rotary kiln (600), the liquid inlet end of the second circulation pipeline (220) being in communication with the liquid outlet end of the second spray tower (210), the plurality of second spray elements (230) being evenly arranged in the second spray tower (210) along the air inlet direction, the liquid inlet end of each second spray element (230) being in communication with the liquid outlet end of the second circulation pipeline (220); A filter assembly (300), wherein the liquid inlet end of the filter assembly (300) is connected to the liquid outlet end of the second spray tower (210), and the material outlet end of the filter assembly (300) is connected to the material feed end of the ceramic cobalt rotary kiln (700).
2. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 1, characterized in that: The alkali spray assembly (100) further comprises an air filter (140), and the air filter (140) is arranged on a pipeline connecting the first spray tower (110) and the ammonium bicarbonate preparation room (400).
3. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 2 is characterized in that: The first circulation pipeline (120) comprises a first main pipeline (1210), a first circulation pump (1220) and a plurality of first branch pipelines (1230); the liquid inlet end of the first main pipeline (1210) is connected to the liquid outlet end of the first spray tower (110); the first circulation pump (1220) is arranged on the first main pipeline (1210); the liquid outlet end of the first main pipeline (1210) is respectively connected to the liquid inlet ends of the plurality of first branch pipelines (1230); and the liquid outlet end of each of the first branch pipelines (1230) is connected to the liquid inlet end of the corresponding first spray element (130).
4. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 3 is characterized in that: The alkali spray assembly (100) further comprises a sodium hydroxide liquid adding pipeline (150), a first liquid discharge pipeline (160) and a first liquid discharge pump (170); the liquid outlet end of the sodium hydroxide liquid adding pipeline (150) is connected to the liquid inlet end of the first main pipeline (1210); the liquid inlet end of the first liquid discharge pipeline (160) is connected to the liquid outlet end of the first spray tower (110); the liquid outlet end of the first liquid discharge pipeline (160) is connected to the alkali washing liquid recovery and processing device; and the first liquid discharge pump (170) is arranged on the first liquid discharge pipeline (160).
5. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 1, characterized in that: The second circulation pipeline (220) comprises a second main pipeline (2210), a second circulation pump (2220) and a plurality of second branch pipelines (2230); the liquid inlet end of the second main pipeline (2210) is connected to the liquid outlet end of the second spray tower (210); the second circulation pump (2220) is arranged on the second main pipeline (2210); the liquid outlet end of the second main pipeline (2210) is respectively connected to the liquid inlet ends of the plurality of second branch pipelines (2230); and the liquid outlet end of each second branch pipeline (2230) is connected to the liquid inlet end of the corresponding second spray element (230).
6. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 5, characterized in that: The tail gas absorption component (200) further comprises a main liquid replenishment pipeline (240), a low-salt wastewater liquid addition pipeline (250) and an ammonia liquid addition pipeline (260); the liquid outlet end of the main liquid replenishment pipeline (240) is connected to the liquid inlet end of the second spray tower (210); the liquid inlet end of the main liquid replenishment pipeline (240) is respectively connected to the liquid outlet end of the low-salt wastewater liquid addition pipeline (250) and the liquid outlet end of the ammonia liquid addition pipeline (260).
7. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 6, characterized in that: The second spray tower (210) is provided with an overflow drain port; The tail gas absorption component (200) further comprises an overflow drainage pipe (270), the liquid inlet end of the overflow drainage pipe (270) being in communication with the overflow drainage port, and the liquid outlet end of the overflow drainage pipe (270) being in communication with the liquid inlet end of the filter component (300).
8. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 7, characterized in that: The tail gas absorption component (200) further comprises a bicarbonate ion detector (280), and the bicarbonate ion detector (280) is arranged on the overflow drainage pipe (270).
9. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 7, characterized in that: The filter assembly (300) comprises a filter press (310) and a security filter (320); the liquid inlet end of the filter press (310) is connected to the liquid outlet end of the overflow drainage pipe (270); the material outlet end of the filter press (310) is connected to the material feed end of the ceramic cobalt rotary kiln (700); and the liquid inlet end of the security filter (320) is connected to the liquid outlet end of the filter press (310).
10. The cobalt tetroxide production tail gas recovery and treatment device (10) according to claim 9, characterized in that: The filter assembly (300) further comprises a second liquid discharge pipe (330), a second liquid discharge pump (340) and a wash water storage tank (350); the liquid inlet end of the second liquid discharge pipe (330) is connected to the liquid outlet end of the security filter (320); the second liquid discharge pump (340) is arranged on the second liquid discharge pipe (330); and the liquid inlet end of the wash water storage tank (350) is connected to the liquid outlet end of the second liquid discharge pipe (330).