Panda, Rekha and Kumari, Archana and Jha, Manis K and Hait, Jhumki and Kumar, Vinay and Kumar, J Rajesh and Lee, Jin-Young (2014) Leaching of rare earth metals (REMs) from Korean monazite concentrate. Journal of Industrial and Engineering Chemistry, 20(4) (IF-2.063). pp. 2035-2042.
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Systematic scientific studies for dephosphorization and acid leaching of Korean monazite are reported here. 50% NaOH (w/v) solubilizes 99.99% phosphate, at 170 8C, 100 g/L pulp density in 4 h. Kinetics of phosphate leaching fitted well with model ‘‘chemical reaction control,’’ i.e. 1 (1 X)1/2 = kct, Ea = 58.04 kJ/mol. Further, rare earth hydroxides (REHs) was leached using 6 N HCl at 90 8C, 60 g/L pulp density for 2 h 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.
|Uncontrolled Keywords:||Korean monazite, Leaching, Phosphate, Rare earth hydroxides (REHs), HCl|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Ms. Rekha Panda|
|Deposited On:||16 Apr 2014 16:38|
|Last Modified:||04 May 2016 14:36|
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