Leaching of Rare Earth Elements from Gibbsite-bearing Shale of Southwestern Sinai, Egypt using Ammonium Sulfate via Ion Exchange Mechanism
Gamal, H., Mohrez, W., Abdelkareem, A., Mashaal, H., Abde El-Aziz, H., abd El-fatah, H. (2023). Leaching of Rare Earth Elements from Gibbsite-bearing Shale of Southwestern Sinai, Egypt using Ammonium Sulfate via Ion Exchange Mechanism. EKB Journal Management System, 66(12), 505-510. doi: 10.21608/ejchem.2023.198156.7691
Hany Gamal; Waleed A Mohrez; Ahmed Abdelkareem; Heba Mashaal; hussein M. Abde El-Aziz; Hasan abd El-fatah. "Leaching of Rare Earth Elements from Gibbsite-bearing Shale of Southwestern Sinai, Egypt using Ammonium Sulfate via Ion Exchange Mechanism". EKB Journal Management System, 66, 12, 2023, 505-510. doi: 10.21608/ejchem.2023.198156.7691
Gamal, H., Mohrez, W., Abdelkareem, A., Mashaal, H., Abde El-Aziz, H., abd El-fatah, H. (2023). 'Leaching of Rare Earth Elements from Gibbsite-bearing Shale of Southwestern Sinai, Egypt using Ammonium Sulfate via Ion Exchange Mechanism', EKB Journal Management System, 66(12), pp. 505-510. doi: 10.21608/ejchem.2023.198156.7691
Gamal, H., Mohrez, W., Abdelkareem, A., Mashaal, H., Abde El-Aziz, H., abd El-fatah, H. Leaching of Rare Earth Elements from Gibbsite-bearing Shale of Southwestern Sinai, Egypt using Ammonium Sulfate via Ion Exchange Mechanism. EKB Journal Management System, 2023; 66(12): 505-510. doi: 10.21608/ejchem.2023.198156.7691

Leaching of Rare Earth Elements from Gibbsite-bearing Shale of Southwestern Sinai, Egypt using Ammonium Sulfate via Ion Exchange Mechanism

Egyptian Journal of Chemistry
Volume 66, Issue 12, December 2023, Page 505-510  XML PDF (436.15 K)
Document Type: Original Article
DOI: 10.21608/ejchem.2023.198156.7691
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Authors
Hany Gamal1; Waleed A Mohrez2; Ahmed Abdelkareem3; Heba Mashaal email 4; hussein M. Abde El-Aziz5; Hasan abd El-fatah6
1nuclear materials authoity
2Nuclear Materials Authority
3nuclear materials authority
4Nuclear Material Authority
5Alazher univeristy , fuclty of engeneering
6fuclty of engeneering , alazher univeristy
Abstract
Gibbsite-bearing shale ore, South Western Sinai, Egypt has been identified as containing physically adsorbed rare earth elements (REEs). The investigated material mainly contains an average rare earth elements (REEs) concentration of 6350 ppm. In spite of low grade compared to other rare earth elements (REEs) sources, the low mining cost and the ease of exploitation make it a promising source of rare earth elements (REEs). In this study, experiments were conducted to investigate desorption of rare earth elements (REEs) via ion-exchange mechanism using monovalent electrolyte solution of ammonium sulfate. All laboratory experiments were conducted at ambient temperature by using a batch leaching technique. The impact process factors that affect the leaching of rare earth elements (REEs) such as the ionic strength of (NH4)2SO4, the solution’s pH, liquid/solid (L/S) ratio and the reaction contact time have been optimized. Rare earth elements (REEs) maximum leaching efficiency of 93.8% was achieved with combination of 0.5 M (NH4)2SO4, 30 minutes contact time, L/S ratio of 3:1 at pH 5. The selectivity of REEs has been enhanced and improved as a result of the fast-leaching rate and the ease of the ion exchange process. The simplicity with which REEs can be desorbed from gibbsite surface by ion exchange is due to that the rare earth cations are more hydrated than 〖NH〗_4^+ monovalent cation which results in attachment of 〖NH〗_4^+ to gibbsite surface and desorption of rare earth cations to the liquid phase.
Keywords
Rare earth elements; ion-exchange; ammonium sulfate; rare earth desorption; gibbsite
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