KINETICS OF LEACHING PROCESS OF SELLA URANIUM ORE MATERIAL, SOUTH EASTERN DESERT, EGYPT

Document Type : Original Article

Authors

Nuclear Materials Authority,Cairo, Egypt

Abstract

The leaching of uranium from Sella uranium ore using hydrochloric acid solution has been studied. The
effect of different parameters such as leaching time, hydrochloric acid concentration, liquid/ solid mass
ratio, reaction temperature, mechanical stirring speed are investigated in order to optimize various process
parameters for maximizing the recovery of uranium. The maximum percentage uranium leaching of 96 %
is achieved after 15 min of contact time leaching using 3.0 M hydrochloric acid and 4/ 1 liquid/ solid mass
ratio at 26 °C with 400 rpm mechanical stirring speed.
The experimental data are well interpreted with a shrinking core model with diffusion control through
a porous product layer. By using the Arrhenius expression, the apparent activation energy for the uranium
leaching reaction is evaluated.