| Extraction of La, Ce, and Nd using an ionic liquid and its application to rare earth leachate derived from phosphogypsum |
| Paper ID : 1087-ISCH |
| Authors |
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HESHAM MOSTAFA HASAB ALLA * Kafrelginina, elmahlla elkubra, gharbia |
| Abstract |
| Rare earth elements (REEs) were extracted from phosphogypsum (PG) using an indirect leaching method that produces CaCO3. The carbonation process transforms PG into CaCO3. The calcium carbonate byproduct is rich in REEs . Calcium carbonate, a byproduct of PG carbonation and a rich source of REEs, could dissolve in nitric acid to produce a calcium nitrate leach solution that contains RE nitrate. Subsequently, the most widely used solvent extraction technique can make use of an environmentally benign nitrate ionic liquid. Cyphos IL 101 (trihexyl(tetradecyl)phosphonium chloride) is transformed into trihexyl(tetradecyl)phosphonium nitrate ([P66614][NO3]) ionic liquid by adding 2.5 mol/L potassium nitrate. The extraction examinations were tested by equilibration of 2 mL of [P66614][NO3] with 2 mL of a synthetic solution of 1000 mg/L of individual La, Ce, and Nd to gain the optimal extraction conditions. The high extraction efficiency of La, Ce, and Nd was gained by stirring a 1/1 aqueous/organic phase ratio and 3 mol/L NH4NO3 (as salting out) at 800 r/min for 40 min at 50 °C to decrease the viscosity of [P66614][NO3]. The La(III), Ce(III), and Nd(III) stripping efficiencies were examined from their loaded [P66614][NO3] ionic liquid by 1/1 A/O ratio of acidified water, 800 r/min stirring speed, and 25 °C. After nine cycles, the extraction and stirring efficiency for the La, Ce, and Nd drop to about 80%. The extraction and stripping parameters are applied to the RE leachate from PG to gain the RE oxide with an assay of 92.67%. |
| Keywords |
| Rare earth elements/Phosphogypsum/ionic liquids/solvent extraction |
| Status: Abstract Accepted (Poster Presentation) |