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262 Handbook on the Physics and Chemistry of Rare Earths AB C OO O NH2 O HN NH O O O N O O H 100 mm SiO2 EDASi SiO2 EDASiDGA CH2Cl2, 298 K O O OH OO O HN O NO Dy3+ OO O NO H SiO2 O O OH FIG. 58 Mg, so it is very important for adsorbents to capture REEs selectively in such a complex solution. For apatite ore from Phalaborwa, Ogata et al. (2016) carried out decompo- sition and REE adsorption experiments using 0.5–6 M H2SO4 and EDA- SiDGA on lab-scale. The apatite ores contain about 8000ppm REEs (Table 14). Gypsum was detected in all of the decomposition experiments (Fig. 59). Leaching ratios for REEs are relatively high in low H2SO4 concen- tration conditions (<2 M H2SO4) (Fig. 60). This means that REE leaching from apatite ores by using low concentration H2SO4 is possible and the Photographs of EDASiDGA (A, B). (C) Preparation of an adsorbent and adsorption model of Dy (HREE) by EDASiDGA. Modified from Ogata, T., Narita, H., Tanaka, M., 2014. Immobilization of diglycol amic acid on silica gel for selective recovery of rare earth elements. Chem. Lett. 43, 1414–1416.PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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