Recycling Method and Treatment Technology of Lithium Battery
The recycling process of waste lithium batteries mainly includes pretreatment, secondary treatment and advanced treatment. Since the waste battery still has some power, the pretreatment process includes deep discharge process, breakage and physical separation. The purpose of the secondary treatment is to achieve separation of the active material of the anode and the substrate. Generally, the complete separation of the two is achieved by heat treatment, organic solvent dissolution, lye dissolution, electrolysis, etc. The advanced treatment mainly includes two processes of leaching and separation and purification to extract valuable metal materials. According to the classification of extraction process, the battery recovery method can be divided into three technologies: dry recovery, wet recovery and biological recovery.
Dry recovery refers to the direct recovery of materials or petroleum metals without passing through media such as solutions. The main methods used are physical separation and high temperature pyrolysis.
Physical separation method refers to the decomposition of batteries, crushing electrode active materials, current collectors, battery boxes and other battery packs, filtration, magnetic separation, fine crushing, classification, to obtain valuable high-content substances. The physical separation process includes crushing, screening, magnetic separation, fine crushing and classification. The experiment uses a shredder with rotating and fixed leaves to crush, uses sieves with different apertures to classify the material, and uses magnetic separation for further processing to prepare for the subsequent chemical leaching process.
Lithium battery recycling equipment can obtain copper foil, graphite powder, aluminum foil, and lithium cobalt oxide powder through 18650/26650 cylindrical lithium batteries, steel shell/aluminum shell batteries, soft packaging batteries, and partial heat treatment.
Lithium-ion batteries mainly rely on lithium ions inserted into the anode cathode material, degassing energy delivery. According to the applicable equipment and location, lithium-ion batteries have cylindrical, long rod, square, but all are composed of five parts: anode, cathode, electrolyte, organic separator and housing.
How to recycle used lithium batteries?
At this stage, lithium battery recycling equipment is used to physically crush the positive and negative materials of lithium batteries, classify the raw material characteristics of raw materials copper and carbon powder, and separate and recycle the negative raw materials of waste lithium batteries by hammer crushing, vibration screening and cyclone screening. Common waste lithium battery recycling methods include chemical process, ice metallurgy industry and mechanical equipment physics method. Compared with the wet method and ice method, the mechanical equipment physical method does not use chemicals, low energy consumption, is an environmentally friendly and efficient method.
The core choice of lithium battery processing equipment has the characteristics of low-carbon environmental protection, environmental protection and sustainability, no secondary pollution, and has the economic benefits of economic development and environmental protection. Lithium battery recycling can complete the use of valuable components and is harmless to harmful components. The whole recycling process department has processed more than 99% of the value components of scrapped lithium batteries with industrial automation, recycling efficiency, processing capacity and lithium battery processing equipment.