Method and system for recycling lithium iron phosphate

Abstract

The present application relates to the field of lithium iron phosphate technology, and in particular to a method and system for recovering lithium iron phosphate. The present application provides a method and system for recovering lithium iron phosphate, and the method for recovering lithium iron phosphate includes: subjecting a first solution containing at least phosphate and iron ions to a first separation treatment to obtain a second solution containing iron ions and a third solution containing lithium ions; adding iron to the second solution containing iron ions for a reduction reaction to obtain a fourth solution containing ferrous ions; adding oxalic acid to the fourth solution containing ferrous ions for a solid phase reaction and a second separation treatment to obtain a precipitate containing ferrous oxalate and a fifth solution. Different from the traditional method of recovering lithium carbonate and iron phosphate from lithium iron phosphate, the present method innovatively proposes to recover lithium dihydrogen phosphate and ferrous oxalate from lithium iron phosphate, which not only avoids the risk of product oversupply, but also broadens the channels for preparing raw materials for lithium iron phosphate.

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