Lithium iron phosphate waste treatment technology

Abstract

The invention discloses a lithium iron phosphate waste treatment technology. The lithium iron phosphate waste treatment technology comprises the following steps: (1), discharging a waste lithium battery until the voltage is 0, then destroying an outer shell of the waste lithium battery in the case of air isolation, separating out an electrolyte, the outer shell and electrode lugs to obtain a dry core package, separating out a positive electrode sheet from the dry core package, crushing to obtain lithium iron phosphate waste, adding the lithium iron phosphate waste into an alkali solution, stirring for dissolving the lithium iron phosphate waste at 75 DEG C for 5 hours, and then filtering to obtain an aluminum-containing solution and a first filter residue; (2), adding the first filter residue into a sulfuric acid solution, stirring for reaction at 88 DEG C for 5 hours, continuously adding iron powder at a constant rate during the reaction, and reacting until the pH of the solution is 2.5. By the lithium iron phosphate waste treatment technology, the design is reasonable, the cost is low and the technological flow is short; in addition, battery-grade iron phosphate and battery-gradelithium carbonate can be obtained, so that recycling of all components is achieved; moreover, and recycled products are high in added values and are all raw materials of the lithium iron phosphate; the recycling rate of each component is high.

Description

Technical field [0001] The invention belongs to the technical field of chemical engineering, and specifically relates to a process for treating lithium iron phosphate waste. Background technique [0002] With the development of electric vehicles, the recycling of used lithium iron phosphate batteries and lithium iron phosphate waste in the production process has become the focus of attention. At present, the recycling of waste lithium iron phosphate mainly includes the following: [0003] (1) Directly use waste lithium iron phosphate with new lithium iron phosphate after screening. Although this method is simple, the performance of the lithium iron phosphate obtained after matching is reduced and can only be used in low-end industries; [0004] (2) After dissolving lithium iron phosphate, iron precipitates to obtain iron oxide red, lithium recovery, and phosphate recovery, but this process is long and the added value of the product is low. Summary of the invention [0005] 1. Technic...

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Problems solved by technology

[0003] (1) The waste lithium iron phosphate is directly screened and used with new lithium iron phosphate. Although this method is simple, the performance of the lithium iron phosphate obtained after matching is reduced and can only be used in low-end industries;

[0004] (2) After dissolving lithium iron phosphate, iron is precipitated to obtain iron oxide red, lithium recovery, and phosphate recovery, but this process is long and the added value of the product is low

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