Researchers at China’s Guangzhou Institute of Geochemistry have developed a new technique, electrokinetic mining, for the green and efficient recovery of rare earth elements from weathering crusts.
, electrokinetic mining , for the green and efficient recovery of rare earth elements from weathering crusts.
To get to those figures, the scientists first carried out bench-scale experiments in a homemade prototype with a simulated IAD. Results suggested that the REE recovery efficiency achieved by the EKM technique was 2.6 times higher than that achieved by the commonly used ammonium leaching technique.Then, they carried out scaled-up experiments at the kilogram scale in a larger EKM setup.
The group, thus, decided to further explore the mechanisms underlying the high REE recovery efficiency of the EKM. They noticed that the applied electric field that accelerates REEs and water migration unidirectionally towards the designed place via electromigration and electroosmosis is the key to enhancing REE recovery efficiency.
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