Rare earth double sulfates from pre-concentrated bastnasite

By M. Kul, Y. Topkaya, I. Karakaya. 2008

155 citations recorded by the source corpus.

Abstract A mixture of rare earth double sulfates was produced from a Turkish bastnasite-containing pre-concentrate (low grade concentrate) by sulfuric acid baking, subsequent water leaching and precipitation with sodium sulfate. The results of acid baking and leaching indicated that recoveries of rare earth elements up to 90% were readily obtained and the recovery of hydrofluoric acid as a by-product was also possible. Reasonable decontamination of the rare earth double sulfate salt from impurities such as Th, Fe, Al and Mg was possible by rapid precipitation at 50 °C using 1.25 times the stoichiometric amount of Na2SO4. The total rare earth double sulfate content (TREDS) was > 90% and analysed 17.3% La, 15.6% Ce, 3.2% Nd, 1.1% Pr, 0.3% Sm, 0.03% Eu, 0.01% Yb and 0.02% Y together with about 0.7% Ca, Fe, Al and other impurities.

Subfields: Biomaterials, Electronic, Optical and Magnetic Materials, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/edec8e0db27aaaae0137541baa13d9fd7a6854f0

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Citations in the corpus

Leaching of rare earth elements (REEs) and impurities from phosphogypsum: A preliminary insight for further recovery of critical raw materials (2019, background): “Rare earth double sulfates exhibited poor solubility, even in acidic 372 aqueous solution (Kul et al., 2008), thus the precipitation of these phases may have 373 limited the REE solubility.”