HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS

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HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS ( handbook-onphysics-and-chemistry-rare-earths )

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FIG. 35 Distribution map of ion-adsorption type REE deposits and prospects in southern China and neighboring countries (Myanmar and Vietnam). Modified after Yuan, Z.X., Li, J.K., Wang, D.H., Zheng, Z.C., 2013. Metallogenic Regularity of Rare Earth Deposits in China. Dizhi Publisher, Beijing, 1–116 (in Chinese); Wang, D.H., Zhao, Z., Yu, Y., Zhao, T., Li, J.K., Dai, J.J., Liu, X.X., He, H.H., 2013. Progress, problems and research orientation of ion-adsorption type rare earth resources. Rock Miner. Anal. 32, 796–802 (in Chinese with English abstract); Sanematsu, K., 2015. REE deposits and prospective areas in Southeast Asia. Proceedings of PACRIM 2015 Congress, Hong Kong, China, 671–677. 1–4 wt% (NH4)2SO4 solution Oxalic acid (COOH)2 Inhibit-impurities additive NH4HCO3 Ion-adsorption ore Leaching (Ion-exchange) Leachate Tailings (piled, vegetation) Precipitation Precipitation REE oxalate Crystallization Washing REE carbonate Roasting Roasting Mixed REE oxide FIG. 36 Simplified flow of REE leaching from ion-adsorption ores. Partly modified after Chi, R.A., Tian, J., 2009. Weathered Crust Elution-Deposited Rare Earth Ores. Nova Science Publishers, New York. 288 p.

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