Patent ID: 9399828
Filing Date: 2016-07-26
CPC Classification: B01D,C22B,C25D

Claim Text:
1. A method for extracting and removing rare earth metal ions from a plating solution in an extraction tank using an extracting solution, the extraction tank including a lower zone filled with the plating solution and an upper zone filled with the extracting solution, the plating solution containing rare earth metal ions as impurities, the extracting solution containing an extractant in a water-insoluble organic solvent and having a lower specific gravity than the plating solution, said method comprising the steps of: atomizing the extracting solution from a lower position in the extraction tank, into the plating solution in the tank lower zone, and atomizing the plating solution from an upper position in the extraction tank, into the extracting solution in the tank upper zone, for thereby bringing the plating solution in contact with the extracting solution to extract rare earth metal ions from the plating solution into the extractant for removal.