Phosphorus and/or removal of the fluororesin, and a method for the recovery of valuable metals from

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PROBLEM TO BE SOLVED : To provide a method for removing phosphorus and/or fluorine for recovering high-quality valuable metal by preventing the formation of salt with the valuable metal by efficiently removing phosphorus and fluorine from the leachate of a positive electrode active material, and to provide a method for recovering valuable metal using the removing method.SOLUTION : At least one compound selected from the group consisting of a Ca compound, Mg compound, Al compound, and rare earth compound is added to the leachate obtained by leaching the positive electrode active material of a lithium ion battery using an acidic solution. Adjustment is performed so that pH of the leachate is 2-4.