Lithium battery recycling processing equipment sorting lithium iron phosphate cathode sheet material reuse
Release Time：2022-12-16 Source：Battery Recycling Machine Share：
Currently the vast majority of commercialized lithium-ion power battery cathode materials are generally ternary materials, lithium manganate and lithium iron phosphate, of which the ternary material battery and lithium iron phosphate battery market share of about 45%. End-of-life lithium-ion batteries usually contain Co 5% to 20%, Ni 5% to 10%, Li 5% to 7%, other metals (Cu, Al, Fe, etc.) 5% to 10%, organic matter 15% and plastic 7%. The content of valuable metals is higher than the ore itself or even processed ore concentrate, waste lithium-ion batteries are known as a veritable "metal mine". Compared with other batteries, lithium-ion batteries are usually considered clean, green energy, but because lithium-ion batteries contain heavy metal ions, lithium hexafluorophosphate, organic carbonate and other toxic and harmful substances, if not properly treated still cause pollution to water quality, soil and atmosphere. Therefore, the harmless treatment of waste lithium ion and the green recycling of resources is the way to a circular economy, with significant resources, economic and environmental benefits.
Lithium battery recycling processing equipment physical sorting is based on the waste lithium-ion battery components in particle size, specific gravity, magnetism, wettability, friction charge and other physical properties of the differences to achieve the separation and purification of each component [, including sieving sorting, gravity sorting, magnetic sorting and flotation, etc.. With the advantages of economy, environmental protection, short process, simplifying the subsequent metallurgical treatment process, physical sorting in practice is mostly used as a pretreatment process in the recycling process of waste lithium-ion batteries, used to pre-enrich the high content of the material.
Lithium battery recycling processing equipment crushing, screening and sorting. Crushing is the key link in the recycling process of waste lithium-ion battery resources, after the battery is discharged by cutting, shearing or impact crushing reduces the size of the metal shell and internal components of the battery, the components of waste lithium-ion batteries are often crushed in a specific particle size will produce enrichment, showing obvious selective crushing characteristics. After primary impact crushing and sieving of waste lithium batteries, the metal shell and large diaphragm are enriched in the +2 mm crushing product, the metal foil and fibrous diaphragm are enriched in the 0.25-2 mm crushing product, and the electrode active material lithium cobaltate and graphite are enriched in the -0.25 mm crushing product. Zhou Xu et al  used hammer vibration crushing and vibratory screening for waste lithium-ion battery anode materials, and obtained a copper grade of 92.4% in the +0.250 mm particle size, a carbon powder grade of 96.6% in the -0.125 mm particle size, and an effective separation of copper and carbon powder by airflow sorting from -0.125 to +0.250 mm particle size.
In response to the problems of insignificant particle size difference and uneven particle size distribution in the traditional crushing method, the lithium battery recycling equipment adopts the rule crushing method, and the particle size difference between the negative electrode material and aluminum foil and copper foil in the crushed product is great, and the nature of the diaphragm does not change significantly, and the separation of positive and negative electrode material from aluminum foil and copper foil is realized by sieving.
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