Method for ex-situ absorption of waste gas produced during carbothermic lithium extraction of waste lithium batteries

Abstract

The invention relates to the technical field of lithium battery recovery, in particular to a method for ex-situ absorption of waste gas produced during carbothermic lithium extraction of waste lithium batteries. The method comprises the following steps: S1, filling a flue gas absorption device with a positive electrode material; S2, introducing flue gas produced in a carbothermic reduction process into a flue gas absorption device, wherein the flue gas absorption device is kept at a certain temperature; S3, when the concentration of carbon monoxide and VOC at the outlet of the flue gas absorption device exceeds the standard, replacing the positive electrode material in the flue gas absorption device with a positive electrode material which does not absorb the flue gas; S4, mixing the replaced positive electrode material which absorbs the flue gas with carbon powder, carrying out a carbothermic reaction, and allowing generated flue gas to enter the step S2; and S5, preheating the positive electrode material to be packed into the flue gas absorption device with the flue gas exhausted from the flue gas absorption device, and allowing the preheated positive electrode material to enter the step S1. The method has the beneficial effects that 1) a carbon source utilization rate is high; 2) the reduction efficiency of a positive electrode material is high; and 3) flue gas treatment cost is low.

Description

technical field [0001] The invention relates to the technical field of lithium battery recycling, in particular to a method for ectopically absorbing waste lithium battery carbon heat to extract lithium waste gas. Background technique [0002] With the popularity of electric vehicles and portable electronic devices, the use of lithium batteries continues to increase. However, the life of lithium batteries is only 3-7 years, and a large number of lithium batteries have entered the scrapping period in recent years. Waste lithium-ion batteries contain volatile and easily decomposed fluorine-containing electrolytes and heavy metal elements such as copper, cobalt, nickel, and manganese. If they are not properly disposed of, they will easily cause environmental problems and endanger human health. In addition, lithium, cobalt, nickel, manganese, etc. in waste lithium-ion batteries are important valuable and strategic resources. Recycling waste lithium-ion batteries can alleviate ...

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Problems solved by technology

However, harmful exhaust gases such as carbon monoxide and alkanes will be generated during the reaction, which not only easily produces secondary pollution, but also causes waste of carbon sources, as described in the following patent documents: "CN109786739B A kind of molten salt assisted carbothermal reduction recovery lithium battery The method of cathode material", "CN111430829B A kind of waste lithium battery cathode material recycling method under the assistance of biomass waste"

The main ways to purify carbon monoxide and alkane waste gas are high-temperature incineration, catalytic oxidation, etc. These methods not only have high costs, but also cannot resource utilization of carbon monoxide and alkane waste gas, as described in the following patent documents: "CN208995145U A kind of carbon monoxide Purification device", "CN110013858B preparation method of cobalt tetraoxide monolithic catalyst for carbon monoxide purification", "CN210568481U a kind of carbon monoxide purification incinerator"

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