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Fluorapatite Gypsum Apatite sample 0.5 M H2SO4 1 M H2SO4 2 M H2SO4 3 M H2SO4 6 M H2SO4 10 20 30 40 50 60 2q (degree) FIG. 59 XRD patterns of the Phalabowra apatite concentrate and the residues obtained from leach- ing tests at various H2SO4 concentrations. After Ogata, T., Narita, H., Tanaka, M., Hoshino, M., Kon, Y., Watanabe, Y., 2016. Selective recovery of heavy rare earth elements from apatite with an adsorbent bearing immobilized tridentate amido ligands. Sep. Purif. Technol. 159, 157–160. 100 80 60 40 20 0 0246 H2O4 concentration (mol/L) Y La Ce Pr Nd Sm Eu Gd Dy Er Yb FIG. 60 Effect of H2SO4 concentration on REE leaching efficiency for Phalabowra apatite con- centrates. Modified from Ogata, T., Narita, H., Tanaka, M., Hoshino, M., Kon, Y., Watanabe, Y., 2016. Selective recovery of heavy rare earth elements from apatite with an adsorbent bearing immobilized tridentate amido ligands. Sep. Purif. Technol. 159, 157–160. Leaching (%) Intensity (a.u.)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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