Abstract
The extraction of lanthanum (La) and cerium (Ce) from a bastnasite ore by direct acidic leaching
 was investigated. The effects of acid concentration and leaching temperature on the extraction of
 La and Ce from the ore were tested. Using nitric (NHO3), more than 85% of the La and Ce were
 simultaneously extracted into leach solution whereas the La and Ce dissolutions were determined
 as less than 85% by using sulfuric acid (H2SO4). The La dissolution exceeded 90% by using
 hydrochloric acid (HCl); however, the Ce dissolution remained below 85% under the following
 conditions: solid-to-liquid ratio of 20% (w/v), the acid concentration of 20%, leaching temperature
 of 25 °C and leaching time of 1 h. The result revealed that HNO3 could be used as a solvent for
 the maximum simultaneous extraction of the La and Ce from the bastnasite ore. The leaching
 temperature had no crucial effect on the dissolution of La and Ce when HNO3 or HCl solutions
 were preferred as a solvating agent. However, the leaching temperature had a slight positive effect
 on the dissolutions of La and Ce when H2SO4 was used as a solvent.
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