Synthesis of Lithium Ion-sieve with Fractional Steps

摘要

To meet increasing demand for lithium, it is very essential for exploiting the lithium resources dissolved in seawater, groundwater and brine. It's prospected that extracting lithium from solution with lithium ion-sieve, that is, spinel lithium magnesium oxides. Preparing high effective lithium ion-sieve is the heart of the technology. Magnesium oxide (MnOOH), the precursor (Li{sub}1.6Mn{sub}1.6O{sub}4) and the lithium ion-sieve were prepared successively, and their structure and properties were characterized with AAS, XRD and SEM. The results show that fibrous MnOOH is synthesized via hydrothermal reaction of KMnO{sub}4 and ethanol at 120°C for 24h, and brown Li{sub}1.6Mn{sub}1.6O{sub}4 with little impurity is prepared with the Li/Mn mole ratio 4 after hydrothermal reaction of MnOOH and 4mol/L LiOH at 120°C for 24h and roast 4h at 400°C, then lithium ion-sieve is obtained after washing 24h with 0.5mol/L HC1 solutions and its adsorption capacity for Li{sup}+ reaches 38.26mg/g, which has considerable potentiality comparing to its theory value. All these suggested that synthesis of single phase Li{sub}1.6Mn{sub}1.6O{sub}4 should be essential for next study on extraction lithium with lithium ion-sieve from seawater, groundwater and brine.