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Rare earth elements (REEs) indicate the fifteen lanthanides (with atomic number from 57 to 71) and scandium (Sc) and yttrium (Y). REEs have attractive physical and chemical properties. REEs are used as pigments, optical materials, magnetic materials and thermoelectric materials [1-6]. Tamagawa hot spring (Akita, Japan) is acidic in nature (pH 1.2) that contains very low concentration of REEs (1 to 70 μ g/L) [7-9]. However, output water from Tamagawa hot spring is very high (ca. 9,000 L/min). Thus, generated REEs amount will be over 1 t/yr. The hot spring water does not have high REEs concentration for application to REEs refining process, but be used as REEs resources after enrichment process. However, other components in the hot spring water (e.g. iron (Fe), aluminum (Al) etc.) should be removed from hot spring water, because these are impurity in refining process. For the direct recovery and refining of REEs from hot spring water, an effective enrichment process is required. The current study was focused on the enrichment of REEs from Tamagawa hot spring water by adsorption and precipitation process. In this study, cation exchange resins were used for selective recovery of REEs and 6M HCl was used as stripping reagent from the resins. After, stripping REEs was concentrated by pH control using NaOH. In this study, we have achieved very high enrichment of REEs from Tamagawa hot spring water using adsorption and precipitation technique. Definitely this type of work would throw more light into the REEs recovery from hot spring water and new resource of REEs. 2 EXPERIMENTS

A Study of Enrichment Process of Rare Earth Elements from Tamagawa Hot Spring Water