| Popis: |
In the present work, a process for the treatment of Abu Tartur phosphate rock for the recovery of lanthanides without interfering with the normal route proposed for fertilizer production, is proposed using HNO3 as a leaching agent. Further, an attempt was made to defluorinate the leach solution in order to upgrade the fertilizer and, at the same time, recover the fluorine. A significant benefit of Abu Tartur phosphate rock processes for the recovery of the lanthanides lies in their relatively high content of lanthanides (averaging 0.11%), while the produced fertilizer would pollute the environment less with radioactive materials due to the low uranium content (averaging 25 mg/kg). A further advantage of phosphate rock as a source of rare earth products is the absence of radioactive thorium, the safe disposal of which is vexatious to monazite-based processes. |
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