活性アルミナによる溶融塩中リチウムイオンの選択吸着

概要

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Selective adsorption of lithium ions from molten NaNO_3 containing a slight amount of lithium ions was examined using various inorganic adsorbents. Conse quently, activated alumina was found to be the most promising adsorbent for adsorption of lithium ions be cause of its high recovery. Adsorption by activated alu mina involved chemisorption with the activation energy of 70.7 kJ/mol. It was confirmed that activated alumina showed high stability when mixed with molten salt because no changes of specific pore volume, surface area, or pore size distribution were observed throughout adsorption at high temperatures. Since the adsorption of lithium ions by activated alumina obeyed Freundlich's equation, it was found that the adsorp tion can be treated as that of lithium ions in dilute solu tion. The enrichment of lithium ions on activated alumi na was much higher than that of sodium ions, indicat ing that the selective adsorption of lithium ions from molten salt by activated alumina is feasible.
社団法人日本セラミックス協会の論文
1994-10-01