CN113842742B - Method for ex-situ absorption of waste lithium battery carbon heat extraction lithium waste gas - Google Patents
Method for ex-situ absorption of waste lithium battery carbon heat extraction lithium waste gas Download PDFInfo
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- CN113842742B CN113842742B CN202111234329.0A CN202111234329A CN113842742B CN 113842742 B CN113842742 B CN 113842742B CN 202111234329 A CN202111234329 A CN 202111234329A CN 113842742 B CN113842742 B CN 113842742B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 43
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002699 waste material Substances 0.000 title claims abstract description 26
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 22
- 239000002912 waste gas Substances 0.000 title claims abstract description 21
- 238000000605 extraction Methods 0.000 title claims abstract description 17
- 238000011066 ex-situ storage Methods 0.000 title claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000003546 flue gas Substances 0.000 claims abstract description 65
- 239000000779 smoke Substances 0.000 claims abstract description 52
- 239000007774 positive electrode material Substances 0.000 claims abstract description 46
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 32
- 239000010405 anode material Substances 0.000 claims abstract description 26
- 238000006722 reduction reaction Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000011946 reduction process Methods 0.000 claims abstract description 9
- 238000011049 filling Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000012855 volatile organic compound Substances 0.000 description 23
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000004321 preservation Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 150000001335 aliphatic alkanes Chemical class 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(2+);cobalt(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/502—Carbon monoxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- Treating Waste Gases (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of lithium battery recovery, in particular to a method for ectopic absorption of waste lithium battery carbon heat extraction lithium waste gas, which comprises the following steps: s1, filling a positive electrode material into a smoke absorption device; s2, introducing the flue gas in the carbothermic reduction process into a flue gas absorbing device, wherein the flue gas absorbing device maintains a certain temperature; s3, when the concentration of carbon monoxide and VOC at the outlet of the flue gas absorbing device exceeds the standard, replacing the positive electrode material filled in the flue gas absorbing device with the positive electrode material which does not absorb the flue gas; s4, mixing the replaced positive electrode material absorbing the smoke with carbon powder, performing carbothermic reduction reaction, and enabling the generated smoke to enter S2; s5, preheating the positive electrode material to be filled in the flue gas absorbing device by the flue gas exhausted from the flue gas absorbing device, and enabling the preheated positive electrode material to enter S1. The invention has the beneficial effects that: 1) The utilization rate of the carbon source is high; 2) The reduction efficiency of the anode material is high; 3) The flue gas treatment cost is low.
Description
Technical Field
The invention relates to the technical field of lithium battery recovery, in particular to a method for ex-situ absorbing waste lithium battery carbon heat extraction waste gas.
Background
With the popularization of electric automobiles and portable electronic devices, the use of lithium batteries is increasing. However, the life of lithium batteries is only 3-7 years, and a large number of lithium batteries have been in the scrapped period in recent years. The waste lithium ion battery contains a fluorine-containing electrolyte which is easy to volatilize and decompose and heavy metal elements such as copper, cobalt, nickel, manganese and the like, and if the waste lithium ion battery is not properly treated, the waste lithium ion battery is easy to cause environmental problems and is harmful to human health. In addition, lithium, cobalt, nickel, manganese and the like in the waste lithium ion battery are important valuable resources and strategic resources. The recovery of the waste lithium ion battery can relieve the dependence of China on imported raw materials, stabilize the price fluctuation of the raw materials and reduce environmental pollution, and is an important part in the development process of new energy industry.
The carbothermic reduction method is characterized in that carbon sources such as graphite, activated carbon, lignite and the like are uniformly mixed with the anode material in the waste lithium battery, and then the mixture is reacted under the anaerobic and high-temperature conditions, so that lithium in the anode material is converted into lithium carbonate, and water leaching recovery is carried out. However, harmful waste gases such as carbon monoxide, alkane and the like are generated in the reaction process, so that secondary pollution is easy to generate, and waste of carbon sources is also caused, as described in the following patent documents: "CN 109786739B" is a method for recovering lithium battery anode material by molten salt assisted carbothermic reduction ", and" CN111430829B "is a method for recovering and regenerating waste lithium battery anode material with the assistance of biomass waste. The main modes for purifying the carbon monoxide and alkane waste gas are high-temperature incineration, catalytic oxidation and the like, and the modes have high cost and cannot realize resource utilization of the carbon monoxide and alkane waste gas, and the method is described in the following patent documents: "CN 208995145U" a carbon monoxide purifying device "," CN110013858B preparation method of cobaltosic oxide monolithic catalyst for carbon monoxide purification "," CN210568481U "a carbon monoxide purifying incinerator". There is a need for a method that can purify and recycle carbothermic reduction exhaust gas.
Disclosure of Invention
The invention aims to solve the technical defects and provides a method for ectopic absorption of waste lithium battery carbon thermal extraction lithium waste gas, which realizes low-cost treatment of flue gas generated in the carbon thermal reduction process.
The invention discloses a method for ectopic absorption of waste lithium battery carbon heat extraction lithium waste gas, which comprises the following steps:
s1, filling a positive electrode material into a smoke absorption device;
s2, introducing the flue gas in the carbothermic reduction process into a flue gas absorbing device filled with anode materials, wherein the flue gas absorbing device keeps a certain temperature;
s3, detecting the concentration of carbon monoxide and VOC at the outlet of the flue gas absorbing device, and when the concentration exceeds a certain standard, replacing the anode material filled in the flue gas absorbing device with the anode material which does not absorb the flue gas;
s4, mixing the replaced positive electrode material absorbing the smoke with carbon powder, performing carbothermic reduction reaction, and enabling the generated smoke to enter S2;
s5, preheating the positive electrode material to be filled in the flue gas absorbing device by the flue gas exhausted from the flue gas absorbing device, and enabling the preheated positive electrode material to enter S1.
In the step S2, the temperature of the flue gas absorbing device is maintained at 600 ℃ to 900 ℃ (such as 600 ℃, 640 ℃, 650 ℃, 680 ℃, 750 ℃, 780 ℃, 800 ℃, 880 ℃, 900 ℃ and the like). The elevated temperature is beneficial to improving the reducibility of carbon monoxide and VOCs and improving the absorption efficiency, but the excessive temperature can increase the energy consumption. More preferably, the temperature is 650 ℃ to 800 ℃.
In the step S3, when the concentration of carbon monoxide in the flue gas at the outlet of the flue gas absorbing device exceeds 5-20mg/m 3 And/or the concentration of VOC exceeds 0.05-0.5mg/m 3 And when the smoke absorbing device is used, the positive electrode material filled in the smoke absorbing device is replaced by the positive electrode material which does not absorb the smoke. Specifically: for example, the concentration of carbon monoxide exceeds 5mg/m 3 、8mg/m 3 、10mg/m 3 、12mg/m 3 、15mg/m 3 、18mg/m 3 、20mg/m 3 When the concentration of VOC exceeds 0.05mg/m 3 、0.07mg/m 3 、0.09mg/m 3 、0.2mg/m 3 、0.3mg/m 3 、0.35mg/m 3 、0.45mg/m 3 、0.5mg/m 3 And replacing the positive electrode material filled in the smoke absorbing device with the positive electrode material which does not absorb the smoke. Wherein, the positive electrode material needs to be replaced if one of the two indexes of the carbon monoxide concentration and the VOC concentration exceeds a specified value.
In the step S4, the mass ratio of the positive electrode material to the carbon powder is 3:1-15:1, such as 3: 1. 9: 2. 6: 1. 8: 1. 9: 1. 27: 2. 15:1, etc., the mass ratio of the positive electrode material to the carbon powder is reduced, which is favorable for the carbothermic reaction, but when the mass ratio of the positive electrode material to the carbon powder is too low, the concentration of carbon monoxide and VOC is greatly increased, which is unfavorable for the absorption of flue gas. More preferably, the mass ratio of the positive electrode material to the carbon powder is 4:1-5:1.
in the step S4, the temperature of the reaction system is maintained at 600-950 ℃ during the carbothermal reaction, such as 600 ℃, 640 ℃, 650 ℃, 680 ℃, 750 ℃, 780 ℃, 800 ℃, 880 ℃, 900 ℃, 930 ℃, 950 ℃ and the like. The elevated temperature is favorable for the carbothermic reaction, but when the temperature exceeds 750 ℃, the concentration of carbon monoxide and VOC is greatly increased, which is unfavorable for the absorption of flue gas. More preferably, the reaction temperature is 650 ℃ to 750 ℃.
In the step S5, the flue gas discharged from the flue gas absorbing device preheats the positive electrode material to be charged into the flue gas absorbing device to 400-700 ℃, such as 400 ℃, 430 ℃, 480 ℃, 550 ℃, 570 ℃, 630 ℃, 700 ℃, and the like. The anode material is preheated, so that the absorption efficiency of the anode material to carbon monoxide and VOC can be improved, and the heating energy consumption during flue gas absorption can be reduced.
The method for ectopic absorption of the waste lithium battery carbon heat extraction lithium waste gas has the following beneficial effects:
1) The utilization rate of the carbon source is high;
2) The reduction efficiency of the anode material is high;
3) The flue gas treatment cost is low.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.
Example 1:
as shown in fig. 1, the invention discloses a method for ex situ absorbing waste lithium battery carbon heat extraction lithium waste gas,
1) Filling the anode material preheated to 700 ℃ into a smoke absorption device;
2) Passing the flue gas in the carbothermic reduction process to a flue gas absorbing device filled with positive electrode materials, wherein the flue gas absorbing device is kept at 850 ℃;
3) Detecting the concentration of carbon monoxide and VOC at the outlet of the flue gas absorbing device, when the concentration of carbon monoxide exceeds 5mg/m 3 Or VOC concentrations exceeding 0.1mg/m 3 Replacing the positive electrode material filled in the smoke absorbing device with a positive electrode material which does not absorb smoke;
4) And mixing the replaced positive electrode material with carbon powder according to a mass ratio of 6:1, mixing and carrying out carbothermic reduction reaction under the condition of 750 ℃;
5) And carrying out heat preservation treatment on the smoke discharged from the smoke absorbing device, and preheating the anode material to be filled in the smoke absorbing device by using the smoke.
In the scheme, the removal rate of carbon monoxide and VOC in the waste gas can reach 99.6 percent.
Example 2:
as shown in fig. 1, the invention discloses a method for ex situ absorbing waste lithium battery carbon heat extraction lithium waste gas,
1) Filling the anode material preheated to 500 ℃ into a smoke absorption device;
2) Passing the flue gas in the carbothermic reduction process to a flue gas absorbing device filled with positive electrode materials, wherein the flue gas absorbing device is kept at 750 ℃;
3) Detecting the concentration of carbon monoxide and VOC at the outlet of the flue gas absorbing device, when the concentration of carbon monoxide exceeds 5mg/m 3 Or VOC concentrations exceeding 0.2mg/m 3 Replacing the positive electrode material filled in the smoke absorbing device with a positive electrode material which does not absorb smoke;
4) The replaced positive electrode material and carbon powder are mixed according to the mass ratio of 10:1, mixing and carrying out carbothermic reduction reaction at 800 ℃;
5) And carrying out heat preservation treatment on the smoke discharged from the smoke absorbing device, and preheating the anode material to be filled in the smoke absorbing device by using the smoke.
In the scheme, the removal rate of carbon monoxide and VOC in the waste gas can reach 99.2 percent.
Example 3:
as shown in fig. 1, the invention discloses a method for ex situ absorbing waste lithium battery carbon heat extraction lithium waste gas,
1) Filling the anode material preheated to 650 ℃ into a smoke absorption device;
2) Passing the flue gas in the carbothermic reduction process to a flue gas absorbing device filled with anode materials, wherein the flue gas absorbing device is kept at 800 ℃;
3) Detecting the concentration of carbon monoxide and VOC at the outlet of the flue gas absorbing device, when the concentration of the carbon monoxide exceeds 15mg/m 3 Or VOC concentrations exceeding 0.3mg/m 3 Replacing the positive electrode material filled in the smoke absorbing device with a positive electrode material which does not absorb smoke;
4) And mixing the replaced positive electrode material with carbon powder according to a mass ratio of 5:1, mixing and carrying out carbothermic reduction reaction at 800 ℃;
5) And carrying out heat preservation treatment on the smoke discharged from the smoke absorbing device, and preheating the anode material to be filled in the smoke absorbing device by using the smoke.
In the scheme, the removal rate of carbon monoxide and VOC in the waste gas can reach 99.8 percent.
Example 4:
as shown in fig. 1, the invention discloses a method for ex situ absorbing waste lithium battery carbon heat extraction lithium waste gas,
1) Filling the anode material preheated to 450 ℃ into a smoke absorption device;
2) Passing the flue gas in the carbothermic reduction process to a flue gas absorbing device filled with positive electrode materials, wherein the flue gas absorbing device is kept at 700 ℃;
3) Detecting the concentration of carbon monoxide and VOC at the outlet of the flue gas absorbing device, when the concentration of the carbon monoxide exceeds 20mg/m 3 Or VOC concentrations exceeding 0.4mg/m 3 Replacing the positive electrode material filled in the smoke absorbing device with a positive electrode material which does not absorb smoke;
4) And mixing the replaced positive electrode material with carbon powder according to a mass ratio of 3:1, mixing and carrying out carbothermic reduction reaction under the condition of 750 ℃;
5) And carrying out heat preservation treatment on the smoke discharged from the smoke absorbing device, and preheating the anode material to be filled in the smoke absorbing device by using the smoke.
In the scheme, the removal rate of carbon monoxide and VOC in the waste gas can reach 99.1 percent.
Example 5:
as shown in fig. 1, the invention discloses a method for ex situ absorbing waste lithium battery carbon heat extraction lithium waste gas,
1) Filling the anode material preheated to 600 ℃ into a smoke absorption device;
2) Passing the flue gas in the carbothermic reduction process to a flue gas absorbing device filled with positive electrode materials, wherein the flue gas absorbing device is kept at 770 ℃;
3) The concentration of carbon monoxide and VOC at the outlet of the flue gas absorbing device is detectedWhen the concentration of carbon monoxide exceeds 5mg/m 3 Or VOC concentrations exceeding 0.05mg/m 3 Replacing the positive electrode material filled in the smoke absorbing device with a positive electrode material which does not absorb smoke;
4) And mixing the replaced positive electrode material with carbon powder according to a mass ratio of 6:1, mixing and carrying out carbothermic reduction reaction under the condition of 700 ℃;
5) And carrying out heat preservation treatment on the smoke discharged from the smoke absorbing device, and preheating the anode material to be filled in the smoke absorbing device by using the smoke.
In the scheme, the removal rate of carbon monoxide and VOC in the waste gas can reach 99.5%.
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (5)
1. A method for ex-situ absorption of waste lithium battery carbon heat extraction lithium waste gas is characterized by comprising the following steps: the method comprises the following steps:
s1, filling a positive electrode material into a smoke absorption device;
s2, introducing the flue gas in the carbothermic reduction process into a flue gas absorbing device filled with anode materials, wherein the flue gas absorbing device keeps a certain temperature;
s3, detecting the concentration of carbon monoxide and VOC at the outlet of the flue gas absorbing device, and when the concentration exceeds a certain standard, replacing the anode material filled in the flue gas absorbing device with the anode material which does not absorb the flue gas;
s4, mixing the replaced positive electrode material absorbing the smoke with carbon powder, performing carbothermic reduction reaction, and enabling the generated smoke to enter S2;
s5, preheating the positive electrode material to be filled in the flue gas absorbing device by the flue gas exhausted from the flue gas absorbing device, and enabling the preheated positive electrode material to enter S1;
wherein in the step S2, the temperature of the flue gas absorbing device is kept at 600-900 ℃.
2. The method for ex situ absorption of waste lithium battery carbon heat extraction lithium exhaust gas according to claim 1, wherein the method comprises the following steps: in the step S3, when the concentration of carbon monoxide in the flue gas at the outlet of the flue gas absorbing device exceeds 5-20mg/m 3 And/or the concentration of VOC exceeds 0.05-0.5mg/m 3 And when the smoke absorbing device is used, the positive electrode material filled in the smoke absorbing device is replaced by the positive electrode material which does not absorb the smoke.
3. The method for ex situ absorption of waste lithium battery carbon heat extraction lithium exhaust gas according to claim 1, wherein the method comprises the following steps: in the step S4, the mass ratio of the positive electrode material to the carbon powder is 3:1-15:1.
4. the method for ex situ absorption of waste lithium battery carbon heat extraction lithium exhaust gas according to claim 1, wherein the method comprises the following steps: in the step S4, the temperature of a reaction system is kept at 600-950 ℃ in the carbothermic reaction process.
5. The method for ex situ absorption of waste lithium battery carbon heat extraction lithium exhaust gas according to claim 1, wherein the method comprises the following steps: in the step S5, the flue gas discharged from the flue gas absorbing device preheats the anode material to be filled into the flue gas absorbing device to 400-700 ℃.
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