Rare Earth and Phosphorus Leaching from a Flotation Tailings of Florida Phosphate Rock
Abstract
:1. Introduction
2. Materials and Methods
2.1. Flotation Tailings Sample and Chemical Reagents
2.2. Leaching Studies
3. Results
3.1. Effect of Leaching Time
3.2. Effect of Initial Phosphoric Acid Concentration in Pulp
3.3. Effect of Temperature
3.4. Effect of H2SO4/CaO Ratio
3.5. Effect of Weight Ratio of Liquid to Solid
4. Discussion
5. Conclusions
Authors Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Product | Yield/% | REE Content/ppm | P2O5 Content/% | Recovery/% | |
---|---|---|---|---|---|
REEs | P2O5 | ||||
Concentrate | 10.43 | 866.31 | 11.74 | 55.84 | 40.97 |
Tailings | 89.57 | 79.79 | 1.97 | 44.16 | 59.03 |
Calculated feed | 100.00 | 161.82 | 2.99 | 100.00 | 100.00 |
Component | P2O5 | CaO | Fe2O3 | MgO | Al2O3 | ||||
---|---|---|---|---|---|---|---|---|---|
Content (%) | 11.74 | 18.62 | 1.64 | 0.12 | 0.44 | ||||
Element | Sc | Y | La | Ce | Pr | Nd | Sm | Eu | Gd |
Content (ppm) | 9.18 | 187.38 | 131.86 | 251.23 | 29.96 | 164.23 | 0.00 | 3.87 | 28.02 |
Element | Tb | Dy | Ho | Er | Tm | Yb | Lu | Total REEs | |
Content (ppm) | 2.44 | 23.23 | 4.11 | 10.93 | 6.38 | 12.03 | 1.46 | 866.31 |
Screen Mesh | Size (um) | Yield (%) | Content of Chemical Component (%) | |||||
---|---|---|---|---|---|---|---|---|
P2O5 | CaO | MgO | Fe2O3 | Al2O3 | Total REEs (ppm) | |||
+35 | +500 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
−35 + 60 | −500 + 250 | 0.40 | 8.27 | 11.10 | 0.23 | 1.52 | 1.25 | 246.32 |
−60 + 80 | −250 + 180 | 1.84 | 7.87 | 8.93 | 0.12 | 1.02 | 0.63 | 239.54 |
−80 + 120 | −180 + 125 | 23.59 | 10.14 | 22.05 | 0.12 | 0.98 | 0.41 | 707.56 |
−120 + 150 | −125 + 100 | 21.93 | 17.74 | 26.81 | 0.16 | 1.36 | 0.48 | 910.16 |
−150 + 200 | −100 + 75 | 42.34 | 10.65 | 15.25 | 0.12 | 1.68 | 0.43 | 794.47 |
−200 + 270 | −75 + 53 | 8.51 | 7.04 | 10.10 | 0.11 | 3.25 | 0.34 | 1436.11 |
−270 + 350 | −53 + 45 | 0.85 | 6.21 | 7.80 | 0.12 | 5.11 | 0.29 | 1799.29 |
−350 | −45 | 0.54 | 4.35 | 4.28 | 0.14 | 7.12 | 0.18 | 3404.82 |
Total/Weighted average | 100.00 | 11.64 | 18.70 | 0.13 | 1.62 | 0.43 | 864.18 |
REE | Ksp0 of LnPO4 | Calculated REE Concentration in LnPO4-H3PO4Aqueous Solution with [PO43−] = (0.70–2.18) × 10−20 mol/L | Analyzed REE Concentration in Leaching Solution | |
---|---|---|---|---|
×10−6 mol/L | ppm | ×10−6 mol/L | ||
Y | 9.55 × 10−26 | 4.38–13.74 | 41.71 | 551.72 |
La | 1.78 × 10−26 | 0.82–2.56 | 20.40 | 172.72 |
Ce | 5.37 × 10−27 | 0.25–0.77 | 36.95 | 310.12 |
Pr | 3.72 × 10−27 | 0.17–0.53 | 2.78 | 23.20 |
Nd | 6.31 × 10−27 | 0.29–0.91 | 33.26 | 271.17 |
Sm | 6.46 × 10−27 | 0.30–0.93 | 0.00 | 0.00 |
Eu | 1.10 × 10−26 | 0.50–1.58 | 1.18 | 9.13 |
Gd | 2.40 × 10−26 | 1.10–3.45 | 4.38 | 32.76 |
Tb | 4.07 × 10−26 | 1.87–5.86 | 0.63 | 4.66 |
Dy | 6.61 × 10−26 | 3.03–9.50 | 4.63 | 33.51 |
Ho | 8.51 × 10−26 | 3.90–12.24 | 0.77 | 5.49 |
Er | 7.41 × 10−26 | 3.40–10.66 | 4.15 | 29.18 |
Tm | 9.33 × 10−26 | 4.28–13.42 | 1.06 | 7.38 |
Yb | 1.29 × 10−25 | 5.91–18.53 | 3.19 | 21.68 |
Lu | 1.78 × 10−25 | 8.16–25.58 | 0.51 | 3.43 |
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Liang, H.; Zhang, P.; Jin, Z.; DePaoli, D.W. Rare Earth and Phosphorus Leaching from a Flotation Tailings of Florida Phosphate Rock. Minerals 2018, 8, 416. https://doi.org/10.3390/min8090416
Liang H, Zhang P, Jin Z, DePaoli DW. Rare Earth and Phosphorus Leaching from a Flotation Tailings of Florida Phosphate Rock. Minerals. 2018; 8(9):416. https://doi.org/10.3390/min8090416
Chicago/Turabian StyleLiang, Haijun, Patrick Zhang, Zhen Jin, and David W. DePaoli. 2018. "Rare Earth and Phosphorus Leaching from a Flotation Tailings of Florida Phosphate Rock" Minerals 8, no. 9: 416. https://doi.org/10.3390/min8090416