Studies on the Extraction of Uranium and Rare Earth Elements from El-Erediya Ore Material, Central Eastern Desert - Egypt
El Sayed Aly El Sayed Aly Haggag;
Abstract
The present work deals with a low-grade Egyptian ore obtained from El-Erediya mineralized rocks area, lies at about 30 km, south Qena-Safaga road at a sign 85 km midway between Safaga, on the red Sea coast and Qena in the Nile Valley to prepare crude yellow cake and rare earth elements concentrate.
El-Erediya mineralized ore was subjected to several hydrometallurgical processes included the leaching step followed by the uranium separation through the extraction by using anion exchange resin Ambersep 400 SO4 then the elution step and finally precipitation of the crude yellow cake. Additional procedure was applied upon the raffinate solution after the uranium extraction step to prepare rare earth elements concentrate as a by-product by precipitation of REEs by sodium hydroxide. The optimum adsorption parameters affecting the extraction of rare earths by using cation exchange resin Dowex 50X8 from chloride medium was studied then the elution step of Dowex 50X8 and finally the eluate solution subjected to selective precipitation of the rare earths constituents by using oxalic acid.
The leaching process of uranium-REEs ore from El-Erediya in a sulfuric acid solution using hydrogen peroxide as an oxidant was investigated. The leaching conditions of temperature, acid type, hydrogen peroxide concentration, sulfuric acid concentration, contact time, particle size, solid-liquid ratio and agitation rate were studied. The optimum process operating parameters were: ore particle size 100-63 µm; acid type sulfuric acid; sulfuric acid concentration 1.5 M; contact time 120 min; solid-liquid ratio 1:3; H2O2 concentration 1.0 M and agitation rate 600 rpm at temperature 25°C. The uranium leaching efficiency was about 95.2% while the leaching efficiency of REEs and the iron oxide (III) were about 83.6% and 14.52% respectively. The experimental data were well interpreted with a shrinking core model with diffusion control through a porous product layer. The leaching process follows the kinetic model: 1-3 (1-X) 2/3 + 2 (1-X) = k1t
El-Erediya mineralized ore was subjected to several hydrometallurgical processes included the leaching step followed by the uranium separation through the extraction by using anion exchange resin Ambersep 400 SO4 then the elution step and finally precipitation of the crude yellow cake. Additional procedure was applied upon the raffinate solution after the uranium extraction step to prepare rare earth elements concentrate as a by-product by precipitation of REEs by sodium hydroxide. The optimum adsorption parameters affecting the extraction of rare earths by using cation exchange resin Dowex 50X8 from chloride medium was studied then the elution step of Dowex 50X8 and finally the eluate solution subjected to selective precipitation of the rare earths constituents by using oxalic acid.
The leaching process of uranium-REEs ore from El-Erediya in a sulfuric acid solution using hydrogen peroxide as an oxidant was investigated. The leaching conditions of temperature, acid type, hydrogen peroxide concentration, sulfuric acid concentration, contact time, particle size, solid-liquid ratio and agitation rate were studied. The optimum process operating parameters were: ore particle size 100-63 µm; acid type sulfuric acid; sulfuric acid concentration 1.5 M; contact time 120 min; solid-liquid ratio 1:3; H2O2 concentration 1.0 M and agitation rate 600 rpm at temperature 25°C. The uranium leaching efficiency was about 95.2% while the leaching efficiency of REEs and the iron oxide (III) were about 83.6% and 14.52% respectively. The experimental data were well interpreted with a shrinking core model with diffusion control through a porous product layer. The leaching process follows the kinetic model: 1-3 (1-X) 2/3 + 2 (1-X) = k1t
Other data
| Title | Studies on the Extraction of Uranium and Rare Earth Elements from El-Erediya Ore Material, Central Eastern Desert - Egypt | Other Titles | دراسات عن إستخلاص اليورانيوم والعناصر الأرضية النادرة من خام العرضية وسط الصحراء الشرقية - مصر | Authors | El Sayed Aly El Sayed Aly Haggag | Issue Date | 2017 |
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