Studies show eggshells can help extract rare earth elements sustainably
Researchers from Trinity College Dublin and iCRAG have published their findings in ACS Omega, highlighting the increasing demand for rare earth elements (REEs) in electric vehicles and wind turbines. Current extraction methods are harmful, prompting scientists to find more sustainable alternatives.
Through their research, scientists discovered that calcium carbonate in eggshells can effectively absorb and separate REEs from water. By placing eggshells in REE solutions at different temperatures and durations, they found that the elements diffuse through the shell, forming new minerals on its surface.
At 90 °C, monazite was formed on the shell’s surface, while at 205 °C, the shell transformed into bastnäsite — a stable rare earth carbonate mineral used in industry for extraction.
This innovative approach demonstrates that eggshell waste can be utilized as a cost-effective and eco-friendly solution to meet the rising demand for REEs. The shells retain individual rare earth elements, making them accessible for extraction.
