Comparative feasibility of lithium extraction technologies in U.S. oilfields

The increasing demand for lithium, driven by the expansion of electric vehicle (EV) markets and energy storage solutions, has emphasized the need for sustainable lithium extraction methods. Produced water from oil and gas operations presents a promising domestic lithium source, potentially reducing dependence on conventional sources such as salt lakes and hard rock mining. This study evaluates different lithium extraction technologies from U.S. oilfileds, including adsorption, chemical precipitation, solvent extraction, electrochemical methods, and membranes. Adsorption, chemical precipitation, and solvent extraction emerged as the most practical methods for lithium recovery from produced water, based on efficiency, environmental impact, and cost. Adsorption has shown significant promise for low-lithium concentrations found in oilfield brines, such as those from the Bakken and Delaware Basin, due to its selective nature and moderate environmental impact, making it a viable option for further development. Chemical precipitation was more efficient for high-lithium-concentration sources, such as those found in the Smackover Formation and Fox Creek. However, challenges such as adsorbent regeneration, competing ion selectivity, and potential environmental impacts of chemical precipitation still require further investigation. This study also underscores the economic and environmental benefits of using produced water as a lithium source, potentially contributing to oilfield sustainability through resource recycling and reducing freshwater demand in hydraulic fracturing.