Journal
CHEMICAL ENGINEERING JOURNAL
Volume 377, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.08.211
Keywords
Lithium recovery; Electrically switched ion exchange; Adsorption
Categories
Funding
- National Key R&D Program of China [2018YFC0604805]
- NSFC [U1407120, U1707601]
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The manganese loss of lithium ion-sieves was high in the acid desorption process. Thus, electrically switched ion exchange (ESIX) has been investigated attempting to recover Li+ from brine in recent years. A new high-efficiency process for Li+ recovery from solutions was successfully applied in this study based on LiMn2O4/lambda-MnO2 structures. The adsorption and desorption happened simultaneously at positive and negative electrodes, respectively. The adsorption rates increased with the increasing operating voltages. The adsorption capacity was 3.5 mmol.g(-1) under the optimal voltage (0.75 V). Besides, the adsorption rates and adsorption capacities were mainly affected by operating temperatures, initial Li+ concentrations in adsorption solutions, and initial Li+ concentrations in desorption solutions, respectively. All the experiments results showed lower manganese losses (less than 0.05%) in desorption than traditional methods (1.2%-2.5%). The XRD results denoted that the lambda-MnO2 electrode converted into the LiMn2O4 electrode after adsorption. On the contrary, the LiMn2O4 electrode converted back into the lambda-MnO2 electrode after desorption. Cyclic experiments indicated that the electrodes in the adsorption-desorption process exhibited excellent regenerability.
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