Preliminary communication
https://doi.org/10.17794/rgn.2024.1.3
IMPACTS OF AMMONIUM SULFATE LEACHING ON ION ADSORPTION RARE EARTHS AND SOIL MECHANICAL PROPERTIES
Amirul Asyraf Mohd Hamka
; School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia 14300 Nibong Tebal, Pulau Pinang, Malaysia
Meisam Saleki
; School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia 14300 Nibong Tebal, Pulau Pinang, Malaysia
*
Zohreh Nabavi
; Department of Mining Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
Hesam Dehghani
; Mining Engineering Faculty, Hamedan University of Technology, Hamedan, Iran
* Corresponding author.
Abstract
In-situ leaching (ISL) has gained prominence as a non-destructive method for rare earth element (REE) extraction, particularly in regions like China. However, concerns over the environmental impact and soil stability due to ISL activities have surfaced following a landslide incident. This article distills the essence of a comprehensive research endeavor that delves into the effects of ammonium sulfate ISL leaching, employing concentrations of 0.05M, 0.1M, and 0.5M, on soil mechanical properties. The study encompasses physicochemical, physical, and mechanical tests, unveiling substantial alterations in shear strength, cohesion, angle of internal friction, zeta potential, liquid limit, plastic limit, and plasticity index following leaching. XRF and XRD analyses reveal the presence of REEs and distinctive mineral phases in the soil samples. Overall, ISL induces a weakening of the soil, raising concerns about potential slope failures and emphasizing the need for a deeper understanding of ISL’s impact on soil properties in the context of REE mining.
Keywords
in-situ leaching (ISL); soil mechanical properties; rare earth elements (REEs); ammonium sulfate leaching; environmental impact
Hrčak ID:
314806
URI
Publication date:
1.3.2024.
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