PROCESS FOR PRODUCING RARE METAL

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Residue solutions produced from leaching a mineral resource and extracting a primary target therefrom may contain impurities such as Fe and Al. The present invention relates to a process for extracting rare-earth metals from residue solutions with reduced impurities. The process comprises : recovering a residue solution; adjusting the pH from 3-5 to generate and remove a precipitate; extracting a rare-earth metal ion with at least one of a cation exchange resin and an organic solvent; back extracting the rare-earth metal ion to an eluent; adding oxalic acid in the eluant to precipitate a rare-earth metal oxalate; recovering the rare-earth metal oxalate and then converting it into a rare-earth metal oxide; and electrolyzing the rare-earth metal oxide in a molten salt to collect in a metallic state a rare-earth metal at a cathode.