Practical Study on the Simultaneous Recovery System of Rare Metals from Deep Ocean Water

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In this study, the simultaneous recovery system of rare metals from seawater has been developed by hybridizing the mutual recovery system of lithium, strontium, rubidium and molybdenum with individual adsorbents. We have the following results.(1) Development of inorganic ion size-recognizable adsorbents for Sr, Rb and Mo Zeolitic adsorbent for Sr, MnO_2 type adsorbent for Rb and hematite type adsorbent for Mo were developed, respectively.(2) Elucidation of adsorption mechanism by measuring the adsorption equilibria and kinetics of metallic ionsThe dependencies of pH and concentrations of metallic ions and adsorbent amount on adsorption rates of metallic ions were elucidated by measuring the time courses of the adsorption amount of metallic ions.(3) Development of novel granulation method of adsorbentsA novel granulation method of powder adsorbents were developed by using inorganic binders suchas silica and alumina.(4) Fundamental study of mutual recovery of rare metals from simulated d … More eep ocean waterIndividual selective recovery of Li, Sr, Rb and Mo were carried out by using simulated deep ocean water. The simulated deep ocean water was prepared by referring the component analysis results of deep ocean water sampled at Okino-Torishima site in Tokyo at the end of 2005. The optimization of operation conditions such as flow rate of supplying solution, scrubbing and elution processes were carried out for suppressing the impediment of coexisting ions(5) Fundamental study of simultaneous recovery of rare metals from simulated deep ocean waterSimultaneous selective recovery of four elements from simulated deep ocean water was carried out by using the lab-scale experimental apparatus. In these elements, Li and Sr were recovered with high recovery efficiencies, while Rb and Mo were limited to low recovery efficiency. This is still continuing to study the enhancement of efficiencies.(6) Practical study of simultaneous selective recovery of rare metals from seawaterPractical experiments of simultaneous recovery of Li, Sr, Rb and Mo were carried out by using a pilot plant of rare metal recovery from seawater in Institute of Ocean Energy of Saga University at Imari, Saga for evaluating the time course of recovery efficiencies of adsorbents, disabilities. In these elements, Li were recovered with high recovery efficiencies, while Sr, Rb and Mo were limited to low recovery efficiency. This is still continuing to study the enhancement of efficiencies. Less