Harmless treatment method for retired lithium battery pyrolysis tail gas

A harmless treatment, lithium battery technology, applied in the direction of lithium batteries, chemical instruments and methods, separation methods, etc., can solve the problems of low value of recycled products, complicated treatment process, difficult practical application, etc., to achieve easy control and amplification, The effect of simple process and strong applicability

Active Publication Date: 2021-10-22
NANCHANG HANGKONG UNIVERSITY
View PDF14 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN108666643A proposes a lithium-ion battery positive electrode material recovery method and device, the patent is to crush the lithium-ion battery positive electrode material to be recovered, and after obtaining the material powder, the material powder is sorted by a sieving machine and a wind shaker to obtain a viscous Aluminum foil powder with lithium cobalt oxide impurities. The positive electrode active material obtained by this method has high content of aluminum foil and binder, which will cause problems such as long process flow and low value of recycled products.
CN111841232 A proposes a method for purifying waste lithium battery multi-stage furnace pyrolysis tail gas. In this method, the tail gas discharged from waste lithium battery pyrolysis first passes through a cyclone separator, a flue gas cooler, a bag filter and a first / second / third stage Washing tower treatment; then incinerate the tail gas, and then spray quicklime powder and activated carbon powder into the exhaust tail gas pipeline in sections to remove fluoride, sulfide and dioxin in the tail gas, and finally pass the exhaust gas through the bag filter Non-polluting discharge after dust removal, the treatment process of this method is complicated, it is difficult to be practically applied, and the organic waste gas needs to be incinerated, and the treatment cost is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Harmless treatment method for retired lithium battery pyrolysis tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Perform air pyrolysis on the decommissioned nickel-cobalt-lithium manganese oxide battery material obtained by discharging and dismantling, mix the positive electrode active powder in the pyrolyzed material with potassium pyrosulfate at a mixing mass ratio of 1:2, and then roast at 700°C. The roasted product is leached in pure water at room temperature with a solid-to-liquid ratio of 50g / L, and filtered to obtain a solid cobalt / manganese-based catalyst; the tail gas discharged from pyrolysis is condensed to recover the pyrolysis oil, and then passed through the calcium hydroxide solution to intercept the fluorine in the tail gas compounds; the tail gas after alkali treatment is passed into a fixed-bed catalytic oxidation reactor filled with 60 mg of cobalt / manganese-based catalyst at 50 ml / min for catalytic degradation treatment at 200 ° C.

Embodiment 2

[0027] Perform air pyrolysis on the decommissioned lithium manganate battery material obtained by discharging and dismantling, mix the positive electrode active powder and sulfuric acid in the pyrolyzed material evenly at a mixing mass ratio of 4:1, and then roast at 750°C, and then roast the roasted product with Solid-to-liquid ratio 100g / L, pure water leaching treatment at room temperature, filtration to obtain solid manganese-based catalyst; tail gas discharged from pyrolysis is condensed to recover pyrolysis oil, and then passed through sodium hydroxide solution to intercept fluoride in the tail gas; lye treatment The final tail gas is passed into a fixed-bed catalytic oxidation reactor filled with 80 mg of cobalt / manganese-based catalyst at 70 ml / min for catalytic degradation treatment at 250° C.

Embodiment 3

[0029] The decommissioned lithium cobalt oxide battery material obtained by discharging and dismantling was subjected to air pyrolysis, the positive electrode active powder in the pyrolysis material was mixed with sodium pyrosulfate at a mixing mass ratio of 1:3, and then roasted at 600°C, and the roasted product was Solid-to-liquid ratio 50g / L, pure water leaching treatment at room temperature, and filtration to obtain solid cobalt-based catalyst; tail gas discharged from pyrolysis is condensed to recover pyrolysis oil, and then passed through calcium hydroxide solution to intercept fluoride in tail gas; lye treatment The final tail gas is passed into a fixed-bed catalytic oxidation reactor filled with 90 mg of cobalt-based catalyst at 80 ml / min for catalytic degradation treatment at 150° C.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a harmless treatment method for retired lithium battery pyrolysis tail gas, which relates to the field of comprehensive recycling of waste lithium batteries. The harmless treatment method specifically comprises the following steps of crushing a retired lithium battery electrode material, putting the crushed retired lithium battery electrode material into a pyrolyzing furnace for air pyrolysis, and recovering pyrolysis oil from oil gas discharged by pyrolysis through condensation, enabling the tail gas to pass through alkali liquor to intercept fluoride in the tail gas, enabling positive active powder of the retired lithium battery to be subjected to sulfuration roasting-water immersion to prepare a cobalt/manganese-based catalyst, and then enabling the tail gas treated by the alkali liquor to enter a fixed bed catalytic oxidation reactor filled with the cobalt/manganese-based catalyst recycled from the retired lithium battery to be subjected to catalytic degradation treatment. The catalyst prepared from the retired lithium battery is used for treating the organic waste gas generated by pyrolysis treatment, and is suitable for treating various retired lithium batteries such as lithium cobalt oxide, lithium manganate and nickel cobalt lithium manganate, and the applicability is extremely high; the harmless treatment process of the organic waste gas has the advantages of low temperature, simple process, good operation environment, easiness in control and amplification and the like.

Description

technical field [0001] The invention relates to the field of comprehensive recycling of waste lithium ion batteries, in particular to a method for harmless treatment of pyrolysis tail gas of decommissioned old lithium batteries. Background technique [0002] Due to the advantages of high efficiency, high power, and high energy density, lithium-ion batteries have become an attractive energy storage technology and are undergoing expansive development. However, the service life of lithium-ion batteries is only 2-3 years. If a large number of lithium batteries are not properly disposed of after retirement, the toxic substances contained in them will cause serious environmental hazards. At the same time, decommissioned lithium batteries contain a large number of valuable strategic metal resources. Therefore, the recycling of decommissioned lithium batteries has dual meanings of environmental protection and resource conservation. [0003] At present, there are various recycling ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M10/052B01J23/889B01D53/86
CPCB01D53/8687H01M10/54H01M10/052B01J23/8892Y02W30/84Y02E60/10
Inventor 刘春力米雪刘鹏飞姬海燕罗旭彪曾桂生杨利明邵鹏辉石慧
Owner NANCHANG HANGKONG UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap