Harmless treatment method for retired lithium battery pyrolysis tail gas

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 ...

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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

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