Bio-Oil Assisted Clay Modification and Lithium Recovery

The U.S. agricultural sector produces vast quantities of residues each year from livestock operations, algae cultivation, and other biomass streams. While rich in nitrogen, oxygen, and carbon-containing compounds, much of this material remains underutilized or treated as waste, creating both economic and environmental burdens for rural communities. At the same time, national demand for critical minerals such as lithium is accelerating due to their central role in clean energy technologies, particularly electric vehicle batteries and grid-scale storage. Conventional lithium recovery from clay deposits relies significantly on mineral acid (e.g. sulfuric and hydrochloric) leaching, processes that are energy-intensive, environmentally disruptive, and increasingly constrained by volatile acid supply chains caused by geopolitical events, transportation bottlenecks, labor shortages, rising costs, and trade policy shifts.

 

Researchers at Arizona State University have developed a budget-friendly, eco-friendly way to extract lithium from hectorite and other lithium-rich clays. The method uses waste-derived bio-oils to break apart clay mineral layers through a process called exfoliation, releasing trapped lithium ions. By replacing energy-intensive, solvent-heavy acid leaching with mild salt treatments, this approach lowers both operating costs and environmental impact. Additionally, it supports a circular economy by turning biomass waste into valuable bio-oils.

 

This technology uses biomass-derived bio-oils and mild salt treatments to release lithium from hectorite clay to reduce the environmental and energy costs of conventional extraction.