Cerium concentrate and mixed rare earth chloride by the oxidative decomposition of bastnaesite in molten sodium hydroxide
- Tohoku Univ., Sendai (Japan)
Bastnaesite was treated in molten NaOH at 623-777 K for 10-60 min under atmosphere. Cerium-(III) in the ore was easily oxidized 95% or more within 30 min to give an oxidation product composed of solid solutions of CeO[sub 2]-rich and CeO[sub 2]-lean phases and Ce-free rare earth oxide phase. Simultaneously fluoride ion was removed 97% or more. Cerium concentrate was prepared from the oxidation product by leaching with 0.1-3 M HCl solution. The yield of cerium concentrate and the CeO[sub 2] content reached 55-57% and 70-72%, respectively. Mixed rare earth chloride is composed of about 90% rare earth chloride and 10% alkaline earth chloride, and the contents of CeCl[sub 3], LaCl[sub 3], NdCl[sub 3], and PrCl[sub 3] are 11.5, 58.5, 14.4, and 5.4%, respectively. The particle size of resulting cerium concentrate was fairly uniform and about 0.1 [mu]m.
- OSTI ID:
- 6483564
- Journal Information:
- Industrial and Engineering Chemistry Research; (United States), Vol. 32:4; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CERIUM
SEPARATION PROCESSES
BASTNAESITE
CERIUM OXIDES
CHEMICAL COMPOSITION
CHLORIDES
FLUORIDES
HEAT TREATMENTS
LEACHING
ORE PROCESSING
OXIDATION
RARE EARTH COMPOUNDS
REMOVAL
SODIUM HYDROXIDES
YIELDS
ALKALI METAL COMPOUNDS
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
DISSOLUTION
ELEMENTS
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
MATERIALS
METALS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
RARE EARTHS
SODIUM COMPOUNDS
THORIUM MINERALS
400105* - Separation Procedures