Details

Autor(en) / Beteiligte

• Panda, Rekha
• Kumari, Archana
• Jha, Manis Kumar
• Hait, Jhumki
• Kumar, Vinay
• Rajesh Kumar, J.
• Lee, Jin Young

Titel

Leaching of rare earth metals (REMs) from Korean monazite concentrate

Ist Teil von

• Journal of Industrial and Engineering Chemistry, 2014, 20(4), , pp.2035-2042

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• Systematic scientific studies for dephosphorization and acid leaching of Korean monazite are reported here. 50% NaOH (w/v) solubilizes 99.99% phosphate, at 170°C, 100g/L pulp density in 4h. Kinetics of phosphate leaching fitted well with model “chemical reaction control,” i.e. 1−(1−X)1/2=kct, Ea=58.04kJ/mol. Further, rare earth hydroxides (REHs) was leached using 6N HCl at 90°C, 60g/L pulp density for 2h to recover ∼95% REMs. Leach liquor generated can be further processed using solvent extraction/ion exchange techniques. From the pure solutions, metal/salts could be obtained using evaporation, precipitation, etc.