Solvent Extraction of Zinc from Acidic Calcium Chloride Solutions by Cyanex 923

2000 ◽  
Vol 2000 (4) ◽  
pp. 188-189 ◽  
Author(s):  
Susana Martínez ◽  
Francisco José Alguacil
Keyword(s):  
Experimental Data ◽  
Solvent Extraction ◽  
Calcium Chloride ◽  
Phosphine Oxide ◽  
Zinc Chloride ◽  
Chloride Ions ◽  
Extraction Mechanism ◽  
Chloride Solutions ◽  
Slope Analysis ◽  
Cyanex 923

The reaction of zinc chloride with Cyanex 923 (phosphine oxide) in Solvesso 100 has been studied from acidic calcium chloride solutions. The distribution coeffient of zinc is independent of equilibrium pH, thus, suggesting a solvation extraction mechanism. Experimental data indicate that the reaction is exothermic (Δ H° = −55.2 kJmol−1). Slope analysis for the system at various Cyanex 923 concentrations reveals the formation in the loaded organic phases of species which probable 1:2 (Zn: Cyanex 923) stoichiometries. The stoichiometric factor of water in the extraction reaction was found to be 0, 1 or 2, whereas experimental data indicated that two chloride ions are involved for each metal extracted.

scholarly journals Extraction and separation of U(VI) and Th(IV) from hydrobromic acid media using Cyanex-923 extractant

2010 ◽  
Vol 75 (11) ◽  
pp. 1549-1557 ◽  
Author(s):  
Snehal Ghag ◽  
Suresh Pawar
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Organic Phase ◽  
Phosphine Oxide ◽  
Hydrobromic Acid ◽  
Analysis Method ◽  
Acid Media ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923

A systematic study of the solvent extraction of uranium(VI) and thorium(IV) from hydrobromic acid media was performed using the neutral phosphine oxide extractant Cyanex-923 in toluene. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the acidity range 5x10-5-1x10-4 M and 5x10-5-5x10-3 M, respectively, and they are stripped from the organic phase with 7.0 M HClO4 and 2.0- 4.0 M HCl, respectively. The effect of the equilibrium period, diluents, diverse ions and stripping agent on the extraction of U(VI) and Th(IV) was studied. The stoichiometry of the extracted species of these metal ions was determined based on the slope analysis method. The extraction reactions proceed by solvation and their probable extracted species found in the organic phase were UO2Br2?2Cyanex-923 and ThBr4?2Cyanex-923. Based on these results, a sequential procedure for their separation from each other was developed.

Solvent extraction of Au(CN)2−1 with mixtures of the amine Primene JMT and the phosphine oxide Cyanex 923

1997 ◽  
Vol 44 (3) ◽  
pp. 359-369 ◽  
Author(s):  
F.J. Alguacil ◽  
C. Caravaca ◽  
J. Mochón ◽  
A. Sastre
Keyword(s):  
Solvent Extraction ◽  
Phosphine Oxide ◽  
Cyanex 923

Solvent extraction of titanium(IV) from acidic chloride solutions by Cyanex 923

1999 ◽  
Vol 51 (1) ◽  
pp. 9-18 ◽  
Author(s):  
K. Saji John ◽  
J. Saji ◽  
M.L.P. Reddy ◽  
T.R. Ramamohan ◽  
T.P. Rao
Keyword(s):  
Solvent Extraction ◽  
Chloride Solutions ◽  
Acidic Chloride ◽  
Cyanex 923

Recovery and partitioning of Ir(IV) and Ru(III) from chloride solutions by solvent extraction using Cyanex 923/kerosene

2006 ◽  
Vol 82 (1-2) ◽  
pp. 40-47 ◽  
Author(s):  
C.S. Kedari ◽  
M.T. Coll ◽  
A. Fortuny ◽  
E. Goralska ◽  
A.M. Sastre
Keyword(s):  
Solvent Extraction ◽  
Chloride Solutions ◽  
Cyanex 923

Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajesh B. Gujar ◽  
Parveen K. Verma ◽  
Prasanta K. Mohapatra ◽  
Mudassir Iqbal ◽  
Jurriaan Huskens ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Extraction Efficiency ◽  
Minor Actinide ◽  
Acid Solutions ◽  
Extraction Mechanism ◽  
Nitrate Ion ◽  
Nitric Acid Solutions ◽  
Actinide Ions ◽  
Acid Extractant

Abstract Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np4+ and NpO2 2+ was studied using three multiple diglycolamide (DGA) extractants with n-propyl, n-octyl and 3-pentyl substituents termed as L I , L II and L III , respectively, in a mixed diluent of 5% isodecanol and 95% n-dodecane. For comparison purpose, the extraction of Pu4+ and UO2 2+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: L II  > L I  > L III , which changed to L III  > L II  > L I for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10−5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu4+ was better extracted than Np4+, while NpO2 2+ was marginally better extracted then UO2 2+. A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO3)4·mL and MO2(NO3)2·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

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