Comparison of hollow fiber membrane and solvent extraction techniques for extraction of cerium and preparation of ceria by stripping precipitation (original) (raw)
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Extraction of cerium(IV) using tributyl phosphate impregnated resin from nitric acid medium
Transactions of Nonferrous Metals Society of China, 2012
Tributyl phosphate (TBP) solvent was used for impregnation into Amberlite XAD−16 nonionic polymeric resin beads using the wet method to prepare solvent impregnated resin (SIR). Undiluted TBP in a ratio to the resin support (volume to mass) of 6.0 at room temperature (RT) in 24 h was impregnated the resin with a mass ratio of 1.944, while the prepared gross sample of SIR at the ratio of solvent to resin of 3.0 was impregnated with a mass ratio of 1.88. Cerium(IV) oxide concentrate, prepared from crude Egyptian monazite sand, containing 37% cerium, 1.6% thorium and about 40% the other trivalent rare earth oxides, was used to prepare cerium(IV) nitrate solution for extraction using the prepared SIR. The impregnated resin was satisfactory for Ce(IV) extraction from nitric acid medium at room temperature. Cerium loading capacity of the impregnated resin reached 95.6% of the calculated theoretical capacity (173 g/kg (Ce/SIR)) under the conditions of 51.57 g/L cerium and 2.48 g/L thorium, 5.0 mol/L free nitric acid, solution to resin ratio of 10.0 and contacting the phases for 5.0 min. The loading capacity reached 98.75% when cerium concentration was increased to 91.43 g/L under the same conditions.
Emulsion Liquid Membrane Extraction of Cerium Ions from Acidic Solution Using Cyanex 301
ALGERIAN JOURNAL OF NATURAL PRODUCTS, 2015
Membrane processes for separation of chemical species from a mixture are gaining in importance and are emerging as a viable alternative to conventional separation processes. The emulsion liquid membrane (ELM) technique was regarded as an emerging separation technology and was extensively examined for potential applications in such fields as hydrometallurgy, environmental engineering, biochemical engineering, pharmaceutical engineering, and food technology. In the present work, the removal of Cerium ions from acidic solution by using an emulsion liquid membrane (ELM) technique was investigated and we obtained > 98% efficiency with the treatment. For the transport of Ce(III) ions using Cyanex 301 as extractant, the effects of extractant and surfactant concentrations, mixing speed, concentration and type of stripping solution, phase ratio, treatment ratio, and nature of diluent on the extraction rate were studies. Under the optimum conditions, solvent extraction and stripping of ...
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Recovery and Recycling of Cerium from Primary and Secondary Resources- a Critical Review
Mineral Processing and Extractive Metallurgy Review, 2019
Various processes for the recovery of cerium from metallurgical, non-metallurgical and secondary sources are reviewed. Cerium is present as a major constituent of primary resources like monazite, bastnäsite, etc. Various secondary resources of cerium include phosphogypsum, red mud, blast furnace slag, NiMH batteries, FCC catalyst, glass films, CFLs, catalytic converters, etc. This review encompasses the research carried out for the extraction of cerium by pyro-hydrometallurgical methods followed by separation and purification with flowsheets. Also are enlisted in various processes like solvent extraction, ion exchange, membrane adsorption, ionic liquids, carbon-based nanomaterials, used for purification of cerium from the solution. Besides, the alternate methods to prepare cerium salts like fused salt electrolysis and metallothermic reduction are described.
A new and advantageous extraction procedure was developed for extraction of cerium (IV) from nitric acid with din -butylsulfoxide (DBSO) in perchloric acid. The extracted Ce (IV) was determined spectrophotometrically using 0.01 % solution of arsenazo-III in 3 M per-chloric acid. Various parameters such as equilibration time, metal ion concentration, effect of temperature and diverse ions on the extraction of the Ce (IV) were established. U (VI), Th (IV) and Pb (II) interfere whereas only phosphate and fluoride suppress the extraction among anions. The stoichiometric composition of the cerium complex with DBSO was determined by slope analysis and found to be 1:4. The process of extraction was found to be exothermic. Deionized water was the most appropriate solvent for back extraction of cerium. This method is easier and more sensitive than many of the reported procedures.