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Selective recovery of lithium from seawater using a novel MnO2 type adsorbent. II – Enhancement of lithium ion selectivity of the adsorbent

Kitajou A., Suzuki T., Nishihama S., Yoshizuka K.

Ars Separatoria Acta

2003

No. 2

97-106

A novel spinel-type manganese dioxide adsorbent has been developed for the selective recovery of Li+ from seawater. The adsorbent can be prepared from a lithium-rich component of spinel-type lithium dimanganese tetraoxide Li1.5Mn2O4, followed by ion exchange of Li+ by H+ with diluted hydrochloric acid. The X-ray analysis of the adsorbent suggests the adsorption-elution cycle of Li+ progresses under γ expansion-shrinking mechanism of the adsorbent. The adsorption of Li+ progresses via cation exchange, and the selective recovery of Li+ can be carried out, even when the large amount of Na+ coexists in seawater. The chromatographic selective recovery of Li+ from the artificial seawater shows that Li+ can be selectively adsorbed with remaining most of Na+ in the feed solution in the break through step, while Li+ of high purity can recover and concentrate into the elutant in the elution step.

Selective recovery of lithium from seawater using a novel MnO2 type adsorbent

Yoshizuka K., Fukui K., Inoue K.

Ars Separatoria Acta

2002

No. 1

79-86

A novel ?-type manganese dioxide (?-MnO2) adsorbent has been developed for selectively recovering Li+ from seawater. This adsorbent can be prepared from spinel-type lithium di manganese tetra-oxide (LiMn2O4) using ion exchange of Li+ by hydrogen ion. In batch adsorption, ?-MnO2 adsorbent can effectively adsorb Li+ at elevated pH (like seawater; pH=8.1) with quite high selectivity for Li+ vs. Na+ (molar ratio of Li+/Na+ exceeding 800). In chromatographic separation, Li+ can be effectively adsorbed on the adsorbent packed into column, while Na+ is only scarcely adsorbed. In elution stage, Li+ can be concentrated more than 75 times compared to its initial concentration in the feed solution of adsorption stage, while little Na+ was eluted. The molar selectivity coefficient of Li+/Na+ to 2300 can be achieved.