| 摘要 |
PROBLEM TO BE SOLVED: To provide a device which removes relatively easily and efficiently rare earth impurities dissolved in the plating solution in plating a rare earth magnet because ingredients of the rare earth magnet dissolve in the plating solution and becomes a possible cause for poor plating.SOLUTION: Rare earth impurities are precipitated by warming a nickel electroplating solution containing dissolved rare earth impurities by the warming means 7 in a plating tank provided with warming means 7, cooling means 8 and separation removal means 9. After the warmed plating solution is cooled to a temperature for plating treatment by the cooling means 8, the plating solution after separation removal of the precipitation of rare earth impurities by the separation removal means 9 is circulated, while the concentration of the impurities in the plating solution in the plating tank is decreased. |
