Tri-n-butyl phosphate as an extracting agent for inorganic nitrates—VI Further results for the rare earth nitrates

Hesford, E.; Jackson, E.; McKay, H.A.C.

doi:10.1016/0022-1902(59)80232-3

Cited by 110 publications

(30 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The series gradation of Eq. (15), thus provides information on the different trends of the gain of hydrations of lanthanides with varying water content.…”

Section: Different Hydration In Various Inorganic Solutionsmentioning

confidence: 99%

See 1 more Smart Citation

Distribution Equilibrium of Lanthanides in the Liquid-Liquid Extraction System of TBP and Molten Ca(N0₃)₂ · 4 H₂0

Yamana¹,

Kaibuki²,

Moriyama³

1999

Radiochimica Acta

View full text Add to dashboard Cite

Lanthanide / TBP / Hydrate melt / Hydration / Solvent extraction / Calcium nitrate tetra-hydrate SummaryDistributions of lanthanides between tri-butyl phosphate solution and molten calcium nitrate tetrahydrate (Ca(NO,) 2 · 4 H 2 0) were radiochemical^ studied. The apparent equilibrium constants of the extraction reactions of lanthanides were determined and their characteristic systematics along the lanthanide series was studied. In comparison with the similar systematics reported for the extraction systems using nitric acid solutions, the characteristics of the hydration of lanthanides under water-deficient condition of calcium nitrate tetrahydrate was discussed.

show abstract

“…The series gradation of Eq. (15), thus provides information on the different trends of the gain of hydrations of lanthanides with varying water content.…”

Section: Different Hydration In Various Inorganic Solutionsmentioning

confidence: 99%

“…The difference of these two is described by Eq. (15). log K\ -log K'j = (log K 3t -log K 3 ) (15) -(log K hydl -log K hydj ) + (const, -const,)…”

Section: Different Hydration In Various Inorganic Solutionsmentioning

confidence: 99%

Distribution Equilibrium of Lanthanides in the Liquid-Liquid Extraction System of TBP and Molten Ca(N0₃)₂ · 4 H₂0

Yamana¹,

Kaibuki²,

Moriyama³

1999

Radiochimica Acta

View full text Add to dashboard Cite

show abstract

“…The formation of such species was discussed in analysis of data on extraction of REEs with TBP from concentrated aqueous HNO 3 [12]. Figure 6 shows that, at 70% TIAP content in dodecane and with neat TIAP, the minimum in the plot of log D Sc vs. [HNO 3 ] disappears.…”

Section: Resultsmentioning

confidence: 95%

Extraction of Scandium from Various Media with Triisoamyl Phosphate: 1. Extraction of Sc and Impurity Metals from Aqueous Nitric Acid Solutions

et al. 2005

View full text Add to dashboard Cite

The main features of extraction of Sc from aqueous nitric acid solutions with triisoamyl phosphate (TIAP) were studied. It was shown that Sc passes into the organic phase in the form of Sc(NO 3 ) 3 . 3TIAP. The extraction isotherms of Sc from its aqueous HNO 3 solutions and from those containing salting-out agents (LiNO 3 , NH 4 NO 3 ) with TIAP in dodecane were obtained. The distribution factor of Sc was studied in relation to the concentrations of TIAP, salting-out agent, and HNO 3 . The extraction of Sc and impurity metals (Zr, Th, REE) with TIAP was studied at widely varied HNO 3 concentration in the aqueous phase. The separation factors of Sc from impurity metals were determined. Scandium, a rare metal, finds application in various modern branches of science and industry. However, high price of scandium caused by complicated technique of its recovery from very lean ores hinders wide-scale application of this metal. Therefore, the development of techniques ensuring the efficient recovery and purification of this metal is an urgent problem.It is known that the main industrial process for recovery of rare metals, among them scandium, is extraction. This technique is characterized by high performance, relative simplicity of equipment and process control, high selectivity, and other advantages.As a rule, rare metals are extracted with neutral organophosphorus compounds (mainly TBP) and organophosphorus acids, e.g., di(2-ethylhexyl) hydrogen phosphate (HDEHP).A new organophosphorus reagent, triisoamyl phosphate (TIAP), recently became available. It was reported [1, 2] that, in extraction of REEs and other metals, this extractant shows certain advantages.TIAP in inert solvents ensures higher stability of the organic extract with respect to its separation into two organic phases in recovery of metals and acids from their concentrated aqueous solutions. The solubility of TIAP in water is approximately twenty times lower than that of TBP. Low solubility of TIAP in water is especially important in preparing high-purity scandium and other metals, since it decreases the contamination of raffinate with phosphorus and facilitates the regeneration of solutions to be discharged and evaporated.No data have been reported on extraction of Sc and impurity metals with TIAP. In this work we studied these questions to estimate the suitability of TIAP for extractive recovery and purification of scandium to obtain high-purity metal. EXPERIMENTALIn our experiments we used commercial triisoamyl phosphate, TU (Technical Specification) 6-02-13-203 83. This reagent contained more than 98% main compound, 0.06% isoamyl alcohol, and less than 0.002% isoamyl hydrogen phosphate. The density of this reagent was 0.952 g cm !3 . Before extraction, TIAP was triply treated with aqueous Na 2 CO 3 and then washed with distilled water to neutral reaction. Dodecane (pure grade) was used as diluent.The Sc-containing salt solutions were prepared by dissolving scandium oxide (99.9% purity) in the required amount of aqueous mineral acid. The mineral acids ...

show abstract

“…The phosphate groups were linked not only to surface titanol but to silanol groups as well. Approximately 40% of the P species were surface titanium(IV) (alkyl)phosphates (3, 4, 6) and 30-49% were surface silicon (alkyl)phosphates (1, 2, 5).The titanium(IV) hydrogenphosphate (7) and pyrophosphate (8), representing the remaining 20% P species, most probably existed in quasi-amorphous state rather than being covalently linked to the surface. 36 The results indicated that the phosphate grafting rate was higher for titanium(IV) than silicon, since the overall surface silanol groups were more abundant than titanol groups according to the elemental analysis and 29 Si NMR spectra.…”

Section: Synthesis and Characterisationmentioning

confidence: 99%

Titanium alkylphosphate functionalised mesoporous silica for enhanced uptake of rare-earth ions

et al. 2017

View full text Add to dashboard Cite

show abstract

Tri-n-butyl phosphate as an extracting agent for inorganic nitrates—VI Further results for the rare earth nitrates

Cited by 110 publications

References 10 publications

Distribution Equilibrium of Lanthanides in the Liquid-Liquid Extraction System of TBP and Molten Ca(N0₃)₂ · 4 H₂0

Distribution Equilibrium of Lanthanides in the Liquid-Liquid Extraction System of TBP and Molten Ca(N0₃)₂ · 4 H₂0

Extraction of Scandium from Various Media with Triisoamyl Phosphate: 1. Extraction of Sc and Impurity Metals from Aqueous Nitric Acid Solutions

Titanium alkylphosphate functionalised mesoporous silica for enhanced uptake of rare-earth ions

Contact Info

Product

Resources

About

Tri-n-butyl phosphate as an extracting agent for inorganic nitrates—VI Further results for the rare earth nitrates

Cited by 110 publications

References 10 publications

Distribution Equilibrium of Lanthanides in the Liquid-Liquid Extraction System of TBP and Molten Ca(N03)2 · 4 H20

Distribution Equilibrium of Lanthanides in the Liquid-Liquid Extraction System of TBP and Molten Ca(N03)2 · 4 H20

Extraction of Scandium from Various Media with Triisoamyl Phosphate: 1. Extraction of Sc and Impurity Metals from Aqueous Nitric Acid Solutions

Titanium alkylphosphate functionalised mesoporous silica for enhanced uptake of rare-earth ions

Contact Info

Product

Resources

About

Distribution Equilibrium of Lanthanides in the Liquid-Liquid Extraction System of TBP and Molten Ca(N0₃)₂ · 4 H₂0

Distribution Equilibrium of Lanthanides in the Liquid-Liquid Extraction System of TBP and Molten Ca(N0₃)₂ · 4 H₂0