The dynamic leaching of lanthanides from a west desert phosphate ore,Egypt(Abu Tartur)by hydrochloric acid,nitric add and sulfuric acid solutions was investigated in this study as a function of acid concentration,flow rate and the presence of some additives such as boric acid.Also the kinetics of leaching of lanthanides was investigated as a function of temperature.It was found that the leaching process could be described by a shrinking-core model,with activation energy about 5.9,13.8 and 21.9 kJ/M for leaching by HCl,HNO3 and H2SO4,respectively.Based on the experimental results,an empirical equation relatedto the rate constant of lanthanides leaching to leaching temperature was established for the purpose of process design.
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