The plating solution of rare earth metal ion extraction method

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SOLUTION : The present invention relates to a method for the extraction and removal of rare earth metal ions included as contaminants in plating solution, in which : extraction liquid of lower density than the plating solution, which results from dissolving a rare earth metal ion extractant into water-insoluble organic solvent, is jetted out in the form of particulates, through the plating solution stored in an extraction tank from the bottom part of the extraction tank; the plating solution to be processed is jetted out in the form of particulates through the extraction liquid stored on the plating solution in the extraction tank from the upper part of the extraction tank; the plating solution in the form of particulates is contacted to the extraction liquid; and rare earth metal ion contaminants in the plating solution are extracted and removed by the extractant.EFFECT : In the present invention, the results before and after the processing of plating solution being compared, it is possible to perfectly extract rare earth metal components without affecting the principal components of the plating solution.SELECTED DRAWING : Figure 1