An experimental design approach for the separation of thorium from rare earth elements
Küçük Resim Yok
Tarih
2018
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
As a part of technological evaluation of Eskisehir-Beylikahir thorium ore of Turkey, a novel study on the separation of thorium from oxalate concentrate including Th, La, Ce, Pr, Nd, Sm, Eu, Gd were carried out. As a first step, thorium-rare earth elements (REEs) oxalate concentrate was precipitated from nitric acid solution by the addition of 100% excess of oxalic acid amount necessary for stoichiometry. The concentrations of Th and REEs in the oxalate concentrate were chosen to simulate the oxalate intermediate product previously obtained from leach liqueur. Separation of thorium from REEs is mainly based on their significant solubility differences in ammonium oxalate solution. The dissolution conditions of thorium-REEs oxalate concentrate were investigated using central composite design (CCD) with three independent variables at five levels. The effect of independent variables such as contact time, amount of precipitate and the concentration of ammonium oxalate (AOX) solution on the thorium dissolution yield (%) were investigated. Analysis of variance (ANOVA) revealed that the effect of precipitate amount and the effect of ammonium oxalate concentration were found significant on the separation of thorium from Th-REEs concentrate. Probability F-value (F = 7 x 10(-6)) and correlation coefficient (R-2 = 0.96) indicate that a proposed model fits the experimental data well. At the optimum conditions the thorium dissolution yield was achieved to 96.66 +/- 2.16%.
Açıklama
Anahtar Kelimeler
Thorium, Rare earth elements, Ammonium oxalate, Separation, Experimental design
Kaynak
Hydrometallurgy
WoS Q Değeri
Q1
Scopus Q Değeri
N/A
Cilt
178
