Nickel electroplating solution in a rare earth removal of impurities

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A method for removing rare earth impurities from a nickel-electroplating solution by keeping a nickel-electroplating solution containing rare earth impurities and having pH of 4.0-5.1 at 60° C. or higher for a certain period of time, and then removing precipitate generated by the heating from the nickel-electroplating solution by sedimentation and/or filtration.