|About this Abstract
||Part C-3: Processing of Critical Metals
||Study of the Deportment of REEs in Ion Adsorption Clays towards the Development of an In-situ Leaching Strategy
||Cody Burcher-Jones, Sfiso Mkhize, Megan Becker, Rahul Ram, Jochen Petersen
|On-Site Speaker (Planned)
The recovery of rare earth elements (REEs) through heap leach/in-situ techniques from so-called ion adsorption clays (IACs) is attractive due to their inherent simplicity. However, the underlying mechanisms of these processes are poorly understood. In this study the deportment of REEs in a typical IAC material has been instigated and was found to concentrate in the phyllo-layers of the clays, especially hallyosite. This understanding informed the testing of a variety of suitable ion-exchange reagents to liberate them. Further, the leaching of REEs from a bed of clay material was investigated over time to understand the rate of transport through the stagnant material. Results indicate that REE release is largely controlled by diffusion through the clay material, while dissolution is rapid. The successful exploitation of this type of IAC deposit would require reasonable perforation of the clay material and potentially a leaching regime of different reagents rather than just one.
||Planned: At-meeting proceedings