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

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

doi:10.1016/j.jiec.2013.09.028

Cited by 98 publications

(46 citation statements)

References 12 publications

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“…The estimated global demand of RE oxides is 0.125 Mt (2013), 0.136 Mt (2014), 0.148 Mt (2015 and 0.160 Mt (2016) (IMCOA, 2013). Thus, interest in the recovery of REs from low grade ores, clays, slags, and secondary sources such as spent batteries and electronic waste has also gathered momentum due to increasing demand and scarcity as well as the need for reducing environmental pollution caused by the discarded waste (Fernandes et al, 2013;Jordens et al, 2013;Kim and Osseo-Asare, 2012;Kim et al, 2014;Kul et al, 2008;Kuzmin et al, 2012;Li et al, 2009;Lister et al, 2014;Moldoveanu et al, 2012Moldoveanu et al, , 2013Panda et al, 2014;Resende and Morais, 2010;Tunsu et al, 2014;Wang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Leachability of rare-earth, calcium and minor metal ions from natural Fluorapatite in perchloric, hydrochloric, nitric and phosphoric acid solutions: Effect of proton activity and anion participation

Bandara

Senanayake

2015

Hydrometallurgy

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A C C E P T E D M A N U S C R I P T C was conducted using particles of size range 150-180 µm, 5% (w/w) solids and a stirring rate of 1100 rpm. The similarities and differences in leaching efficiencies of metal ions are rationalised on the basis of proton activity of acids and the participation of anions due to complexation with metal ions. The leaching efficiency of calcium, phosphate, fluoride, sodium and strontium reached 80-100% after 5-10 min in hydrochloric, perchloric and nitric acid compared to lower leaching efficiencies (<40%) in phosphoric acid. Despite the low solubility products of phosphates of iron(III) and calcium (pK SP ≈ 24, 31), the higher pH, and lower proton activity of phosphoric acid, the higher leaching efficiencies of calcium and iron (≥80%) suggest the formation of complex species of these metal ions with phosphate ions. The leaching efficiencies of lanthanum, cerium and neodymium were low in all acids and showed a descending order: HClO 4 (54-63%) > HCl (21-13%) > HNO 3 (5-7%). The RE leaching efficiency in HClO 4 remained relatively unaffected with time, but the low leaching efficiencies in other acids after 30 min (<20%) indicates the precipitation of RE-phosphates and prospect of selective leaching of FAP. The slope of linear correlation of leaching efficiency of REs was close to unity in HClO 4 , HCl and HNO 3 indicating similar behaviour. A higher slope for La-Ce leaching efficiency correlation of 1.8 compared to 0.9 for Nd-Ce in H 3 PO 4 warrants further studies. ACCEPTED MANUSCRIPT

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Section: Introductionmentioning

confidence: 99%

Leachability of rare-earth, calcium and minor metal ions from natural Fluorapatite in perchloric, hydrochloric, nitric and phosphoric acid solutions: Effect of proton activity and anion participation

Bandara

Senanayake

2015

Hydrometallurgy

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“…Sulfuric acid and alkali caustic soda was used for processing monazite [15][16][17] . The former method was more used and also applied in a pilot plant in NMA project to produce a monazite sulfate solution of U, Th, and REEs while silica, zircon or other admixed gangue minerals are left insoluble.…”

Section: Introductionmentioning

confidence: 99%

Application of Commercial Adsorbent for Rare earth elements - Uranium Mutual Separation and Purification

et al. 2017

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The treatment of rare earths sulfate liquor contaminated with traces of uranium as radioactive contaminates utilizing lewatit mono plus M500 was studied. Adsorption behavior was studied by batch experiments to determine the optimum conditions for uranium removal. The obtained equilibrium data were found to be satisfactory fitted with Langmuir isotherm and the second order rate equation. Also, elution process was achieved by 2M NaCl/1M HCl solution and the reuse of sorbent remains appreciable. A marketable pure product of rare earth oxide was prepared in addition to pure sodium diuranate containing total uranium content of the starting REEs cake.

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“…The use of acid is particularly very common during the leaching of metals from their ores, minerals and concentrates (Sahu et al, 2006;Panda et al, 2014). Metal values from the loaded organic phase in the solvent extraction operation are often stripped using an acid solution.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a novel ionic liquid, Cyphos IL 104 for the solvent extraction of mineral acids

2016

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

Cited by 98 publications

References 12 publications

Leachability of rare-earth, calcium and minor metal ions from natural Fluorapatite in perchloric, hydrochloric, nitric and phosphoric acid solutions: Effect of proton activity and anion participation

Leachability of rare-earth, calcium and minor metal ions from natural Fluorapatite in perchloric, hydrochloric, nitric and phosphoric acid solutions: Effect of proton activity and anion participation

Application of Commercial Adsorbent for Rare earth elements - Uranium Mutual Separation and Purification

Investigation of a novel ionic liquid, Cyphos IL 104 for the solvent extraction of mineral acids

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