End-of-life lithium iron phosphate battery recycling treatment
Release Time：2022-10-28 Source：Lithium battery recycling equipment Share：
Used lithium battery recycling equipment is now very popular, not only because of the need to recycle a lot of used lithium batteries, and used lithium battery recycling equipment can be used to recycle the valuable metals inside the lithium battery, has economic significance. Lithium iron phosphate positive materials with high specific energy, long cycle life, good safety performance and other advantages, is widely used in a variety of new energy vehicles, especially the high safety requirements of pure electric bus power battery.
At present, most of the waste lithium iron phosphate battery recycling research is aimed at positive material, which is mainly composed of lithium iron phosphate, conductive carbon black, PVDF and so on. Used lithium iron phosphate positive material is rich in iron, lithium and other metals, which has a recovery value of the element is lithium, iron also has a certain recovery value, the other parts of the recovery value is low. As the used lithium iron phosphate positive material does not contain cobalt, nickEnd-of-life lithium iron phosphate battery recycling treatmentel and other high-value metals, its recovery value is relatively low compared to other types of used lithium-ion batteries such as NCM ternary materials. Therefore, the waste lithium iron phosphate batteries on the recycling process, low-cost requirements are higher. The current treatment methods for waste lithium iron phosphate batteries are as follows.
The use of wet metallurgy to recover the valuable metal elements in the positive material of used lithium iron phosphate batteries. Used lithium iron phosphate positive material after leaching agent leaching, lithium, iron and phosphorus elements in the form of ions into the solution, the leachate after purification, separation and recovery of lithium, iron elements. Lithium is generally recovered in the form of lithium carbonate and lithium phosphate, while iron is generally recovered in the form of iron phosphate and iron hydroxide. Leaching agent is mainly inorganic acids, such as sulfuric acid, nitric acid and hydrochloric acid, etc., but also organic acid leaching; oxidizing agent is usually used hydrogen peroxide. The useful metals of used lithium iron phosphate can be recovered using a wet process