Method for removing aluminum from lithium iron phosphate black powder

During the recycling process of lithium iron phosphate battery, the lithium iron phosphate black powder is roasted and the aluminum removal treatment is carried out in the ferrous sulfate solution. The replacement reaction between iron and aluminum is used to solve the problems of high iron and phosphorus loss and equipment corrosion in the traditional methods, and a more efficient recycling process is achieved.

CN119797299APending Publication Date: 2025-04-11CHANGZHOU DAOBO INTELLIGENT TECHNOLOGY CO LTD +1
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Patent Information

Application Number
CN202510013091.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-06
Publication Date
2025-04-11

AI Technical Summary

Technical Problem

In the recycling process of lithium iron phosphate batteries, the removal of aluminum impurities in traditional methods will cause excessive loss of iron and phosphorus, and the use of chloride ions or organic acids will cause corrosion to the equipment and increase recycling costs.

Method used

A method is adopted to mechanically crush the lithium iron phosphate black powder in an inert atmosphere, and then add it to the ferrous sulfate solution for aluminum removal. This method uses the replacement reaction between iron and aluminum to remove aluminum, and then extracts phosphorus, iron and lithium through acid leaching, avoiding the use of chloride salt.

Benefits of technology

It effectively reduces the loss of iron and phosphorus during the removal of aluminum impurities, and the overall loss does not exceed 2.08%. Since no chloride salt is used, equipment corrosion is avoided and recycling costs are reduced.

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Abstract

The invention belongs to the field of lithium battery material recovery, and particularly relates to a method for removing aluminum from lithium iron phosphate black powder, which comprises the following steps: S1, discharging a lithium iron phosphate battery to be recovered, and then mechanically crushing and screening out the lithium iron phosphate black powder; s2, the lithium iron phosphate black powder is added into a first-section leaching tank to be leached, and first-section leaching liquid and first-section leaching residues are obtained; s3, acid leaching is adopted for second-stage leaching, and second-stage leaching residues and second-stage leaching liquid are obtained through separation after leaching; s4, heating and precipitating the phosphorus, iron and lithium lixivium to obtain hydrated iron phosphate solid and lithium-containing lixivium; and S5, precipitating the lithium-containing leachate to obtain a lithium carbonate solid.
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