Method and system for purifying waste gas generated in lithium battery recovery and recovering resources

Abstract

The invention discloses a system for purifying waste gas generated in lithium battery recovery and recovering resources. The system comprises a pyrolysis device, a second dust removal device, a gas mixer, a combustion chamber and a boiler, which are connected in sequence; a splitting device, a first dust removal device and a gas mixer are sequentially communicated; and a hydration tower, a first-stage phosphoric acid catcher, an acid mixing tank, a second-stage phosphoric acid catcher, a hydrofluoric acid recovery tower and a purification tower are sequentially communicated. The invention alsodiscloses a method for purifying waste gas generated in lithium battery recovery and recovering resources. The method has the advantages that the separation and purification of P2O5 and HF are realized, the combustion energy of carbonic ester organic matters is utilized, and byproducts such as phosphoric acid, hydrofluoric acid or ammonium fluoride are extracted in a grading manner, so that the treatment difficulty of wastewater and waste residues is greatly reduced, and the method is environment-friendly. In addition, due to the fact that byproducts are high in market value at present, the environment-friendly project has good economic benefits in operation, and resources are saved.

Description

technical field [0001] The invention relates to the field of lithium battery recycling waste gas treatment, in particular to a method and system for lithium battery recycling waste gas purification and resource recovery. Background technique [0002] In recent years, with the development of electronic products and electric vehicle industry, the production and consumption of lithium batteries have been increasing. According to reports, in 2018, China's battery production increased by 26.17% year-on-year to 102Gwh. In 2020, China's lithium-ion battery market output will be Reaching 205.33Gwh, that is to say, in 2020, China's lithium battery output will be about 680,000 tons per year. If lithium batteries end their service life, if they are discarded at will, it will cause very serious pollution to the environment. The best way now is to dispose of waste lithium batteries Recycling, recycling methods are divided into dry method and wet method, but no matter which method, the ba...

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Problems solved by technology

[0007] The Chinese patent with the patent number CN108736091A discloses "a process for dismantling and recycling lithium batteries". In this method, the battery is first pulverized, the metal shell and the contents of the battery are screened, and then the metal is decomposed by pyrolysis. The foil is separated from the electrode binder and volatile gas. The metal foil is sorted to obtain copper foil and aluminum foil. The volatile gas is discharged after heat storage combustion and dust removal. This patent does not recycle the components in the tail gas. The concentration of organic matter in the exhaust gas is 10mg / m 3 ,polluted environment

[0008] Through the description and analysis of the above existing technologies, for the waste gas treatment in the lithium battery recycling process, everyone only pays attention to the removal of gas components that will seriously pollute the environment in the tail gas, and does not recycle the two substances of phosphorus and fluorine. In this way, on the one hand, it will cause waste of resources and pollute the air; on the other hand, it will increase the difficulty in the treatment of back-end wastewater and waste residues, causing a heavy economic burden on recycling companies

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