海洋深層水からのリチウム回収を目的としたパラオおよびフィジー海域における海洋調査とその評価(Oceanic research and possible evaluation of lithium recovery from deep ocean waters near Palau and Fiji islands)
- 標題
- 海洋深層水からのリチウム回収を目的としたパラオおよびフィジー海域における海洋調査とその評価(Oceanic research and possible evaluation of lithium recovery from deep ocean waters near Palau and Fiji islands)
- 作者
- 和嶋 隆昌, 吉塚 和治, 志水 倫恵, 浦田 和也, 中岡 勉, 一瀬 純弥, 田淵 清春, 鎌野 忠, 池上 康之(Takaaki Wajima, Kazuharu Yoshizuka, tomoes Shimizu)
- 文件屬性
- 日本研究
- 知識分類
- 礦物質分離
- 出版年
- 2006
- 刊名
- 海洋深層水研究
- 卷
- 7
- 期
- 1
- 頁
- P 17-22
- 點閱數
- 2847
摘要
海洋深層水からのリチウム回収を目的としてパラオおよびフィジー海域における海水中のLi+分布の調査およびLi+回収において妨害となる海水中の主要イオン分布の調査を行った.両海域の各地点においてLi+濃度は約0.15-0.16mg/Lの一定濃度で鉛直方向に分布していた.海水中の主要共存イオンであるNa+, K+, Mg2+, Ca2+, Cl-, Br-, SO42-についても同様に鉛直方向に一定であった.これらの海域の海水は実証試験に用いた伊万里湾表層水の化学組成とほぼ等しかった.実証試験に用いたλ-MnO2吸着剤は, 低温である海洋深層水から表層海水よりも効率的なLi+吸着を示した.これらのことより, パラオおよびフィジー海域中には, Li+及び共存主要イオンはほぼ一様の分布をしており, 低温のパラオおよびフィジーの海洋深層水から, λ-MnO2吸着剤を用いて効率的なリチウム回収が期待できる.
We investigated ion components (Li+, Na+, K+, Mg2+, Ca2+, Cl-, Br-, SO42-), and their vertical distributions through seawater close to Palau and Fiji islands, for the possible evaluation of recovery of valuable ion components, especially lithium ion. At all sites of both seas, Li+ concentrations were 0.15-0.16 mg/L, and kept constant through out the vertical depth, and main ion components in both seawaters also agreed with each other. The ion compositions of seawaters adjacent to Palau and Fiji were almost the same as those in Imari Bay in Japan. λ-MnO2 adsorbent, which has been used for our benchmark plant experiment for Li+ recovery from seawater, could effectively adsorb Li+ from deep seawater with low temperature compared with surface seawater with high temperature. These results demonstrate that Li+ can be effectively recovered from the deep ocean water near Palau and Fiji islands using the adsorption technique with λ-MnO2 adsorbent.
We investigated ion components (Li+, Na+, K+, Mg2+, Ca2+, Cl-, Br-, SO42-), and their vertical distributions through seawater close to Palau and Fiji islands, for the possible evaluation of recovery of valuable ion components, especially lithium ion. At all sites of both seas, Li+ concentrations were 0.15-0.16 mg/L, and kept constant through out the vertical depth, and main ion components in both seawaters also agreed with each other. The ion compositions of seawaters adjacent to Palau and Fiji were almost the same as those in Imari Bay in Japan. λ-MnO2 adsorbent, which has been used for our benchmark plant experiment for Li+ recovery from seawater, could effectively adsorb Li+ from deep seawater with low temperature compared with surface seawater with high temperature. These results demonstrate that Li+ can be effectively recovered from the deep ocean water near Palau and Fiji islands using the adsorption technique with λ-MnO2 adsorbent.