Abstract
Due to lithium's high energy along with other exceptional characteristics, lithium demand across many industries is rising, specifically for Li-batteries. Therefore, a sufficient supply of high purity lithium is vital in order for these significant technologies to develop. In the current work, industrial grade lithium chloride has been successfully treated with four simple precipitation steps to obtain a high purity battery grade lithium carbonate of >99.95%. The LiCl starting solutions contained K, Na, Mg, Ca, Cu, Ni, and Fe chloride contaminants and solutions of 2.5 to 10 M were simulated. The heavier metals and the majority of Mg were removed in a single step with an increase in pH. The removal of Ca and remaining Mg was executed by sodium oxalate addition where the calcium levels of the 10 M were able to be reduced to 5–6 ppm in solution. It appeared that the higher molarity and ionic strength of the LiCl solution aided in obtained higher degrees of impurity removal. Finally, high purity Li 2 CO 3 was obtained by first precipitating from brine solution, followed by a second purification step with pressurized CO 2 . The second step allowed for the removal of entrapped Na and K after the first precipitation, resulting in >99.95 wt% purity Li 2 CO 3 .
| Original language | English |
|---|---|
| Pages (from-to) | 168-173 |
| Number of pages | 6 |
| Journal | Separation and Purification Technology |
| DOIs | |
| State | Published - May 1 2019 |
Funding
This work was supported by the Y-12 National Security Complex through a subcontract to the Oak Ridge National Laboratory . Y-12 is managed by Consolidated Nuclear Security, LLC, under contract DE-NA0001942 for the Department of Energy. Special thanks to Sandy MacPherson for aiding in the publication.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Oak Ridge National Laboratory | DE-NA0001942 |
Keywords
- Hydrometallurgy
- Lithium carbonate
- Lithium recovery
- Selective precipitation