Method for removing rare earth impurities from nickel-electroplating solution
View Patent ↗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.
1. A method for removing rare earth impurities from a nickel-electroplating solution, consisting essentially of
keeping a nickel-electroplating solution containing rare earth impurities and having pH of 4.0-4.5 without pH adjustment with heating at 60° C. or higher for 6 hours or more; and then
removing a precipitate generated by said heating from said nickel-electroplating solution by sedimentation and/or filtration.
2. The method for removing rare earth impurities from a nickel-electroplating solution according to claim 1 , wherein said nickel-electroplating solution is stirred while heating.
3. The method for removing rare earth impurities from a nickel-electroplating solution according to claim 2 , wherein the solution is stirred by air, rotating stirring blades, or circulation by a pump.