Method and system for treating lithium iron phosphate battery powder

The invention discloses a method and system for treating lithium iron phosphate battery powder, and belongs to the technical field of lithium iron phosphate recovery treatment. The method comprises the following steps: preparing lithium iron phosphate battery powder containing impurity metals into first slurry, and performing first oxidation treatment in an electrolytic oxidation manner until lithium iron phosphate is completely changed into iron phosphate to obtain second slurry; reducing the pH value of the second slurry and carrying out secondary oxidation treatment to dissolve impurity metals in the second slurry; carrying out solid-liquid separation to obtain iron phosphate slag and a solution containing impurity metals; wherein the impurity metal comprises at least one of aluminum and copper; the mode of the second oxidation treatment comprises electrolytic oxidation or chemical oxidation. The method is easy to operate and mild in condition, iron phosphate and impurity metal in the lithium iron phosphat