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Leaching plays an important role in the recovery of rare earth elements. A study on optimizing the relevant parameters such agitation, leaching time and temperature in the dissolution of these elements in HCl, H2SO4 and HNO3 acids were carried out. The recovery of the rare earths is much depended upon the type of acid used in the leaching system. The H2SO4 system shows the highest leached with a rate of 82% while the leaching rate recorded for HCl and HNO3 system were lower at 67% and 59% respectively. Comparative rate of leaching study was also done on the light and heavy rare earths for the three different acid leaching systems and the result shows that the light group has a better rate of leaching than the heavy group.