(400ay) Enrichment of Critical Metals from Unconventional Feeds Using Microwave-Assisted Liquid Contactor

Addressing the supply challenges of critical metals materials (CMMs), particularly rare earth elements (REEs), requires exploring alternative secondary resources. Characterization results show that unconventional feedstocks can provide enough CMMs for domestic uses. For example, bauxite residue (red mud) from the aluminum industry contains approximately 0.3 wt% (3000 ppm) of REEs and Gallium.

This study focuses on the extraction of critical metals, including REEs, from unconventional resources such as mine tailings or solid wastes. Systematic leaching experiments will be conducted using acid/base solutions and deep eutectic solvents. To further enhance leaching efficiency, a novel microwave-based pretreatment process will be employed. This innovative approach aims to unlock the technological potential for REE recovery from secondary resources.