Separation and purification of Th from U by ammonium molybdophosphate from nitric solutions

2002 ◽  
Vol 90 (5) ◽  
Author(s):  
A. M. I. Ali ◽  
H. G. Nowier
Keyword(s):  
Nitric Acid ◽  
Acid Concentration ◽  
Nitric Acid Concentration ◽  
Acid Solutions ◽  
Separation And Purification ◽  
Retention Capacity ◽  
Nitric Acid Solutions ◽  
Ammonium Molybdophosphate ◽  
Saturation Capacity

SummaryAmmonium molybdophosphate(AMP) was synthesized and characterized. The AMP was found to be insoluble in water or nitric acid solutions of different concentrations. The sorption of Th and U from nitric acid by AMP has been investigated. The effect of shaking time on the sorption of Th was studied. The effect of nitric acid, Th concentration and AMP on the sorption of Th were also studied. Studies on the retention capacity of AMP showed that its capacity decreased by increasing the nitric acid concentration of Th. The saturation capacity was found to be 120 mg Th/g

Selective separation of silver(I) by novel substituted thiourea

2007 ◽  
Vol 95 (8) ◽  
Author(s):  
Aslam Khan
Keyword(s):  
Experimental Data ◽  
Nitric Acid ◽  
Acid Concentration ◽  
Organic Phase ◽  
High Selectivity ◽  
Nitric Acid Concentration ◽  
Equilibration Time ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Species Effect

The extraction of silver(I) from nitric acid solutions using naphthyl substituted thiourea such as 1-naphthylthiourea (ANTU) has been studied. Different variables: equilibration time, aqueous pH, chloride and extractant concentrations and organic phase diluent that could affect the extraction system were evaluated at 28.0 ± 2.0 °C. It was found that silver is quantitatively extractred by ANTU over the entire studied range of nitric acid concentration. Extraction of silver by ANTU is fast and equilibration was achieved in less than five minutes. Experimental data relating to silver have been analysed to determine the stoichiometry of the extracted species. Effect of foreign ions on the extraction of silver was carried out. Recycling capacity of the extractant was also studied. Thiourea and EDTA solutions were found suitable for > 99% stripping of extracted silver(I). The reagent has been found to have high selectivity for silver against copper, cadmium, nickle, cobalt, halfnium, zircomium and europium.

Evaluation of selectivity and radiolysis behavior of some promising isonicotinamids and dipicolinamides as extractants

2007 ◽  
Vol 95 (9) ◽  
Author(s):  
E. A. Mowafy
Keyword(s):  
Nitric Acid ◽  
Acid Concentration ◽  
Nitric Acid Concentration ◽  
Acid Solutions ◽  
Salting Out ◽  
Nitric Acid Solutions ◽  
Long Chain

A series of long chain isonicotinamides (pyridine-4-carboxamides) and dipicolinamides (pyridine-2,6-dicarboxamides) have been prepared with different substituting groups and the extracting ability for Fe(III), Am(III), Eu(III), Sr(II), Co(II) and Cs(I) from nitric acid solutions has been studied. Distribution ratios of Fe(III) as function of nitric acid concentration, extractants concentration and salting-out agent have been measured by using

Metal extraction by N,N′-dialkyl-N,N′-diaryl-dipicolinamides from nitric acid solutions

2007 ◽  
Vol 95 (4) ◽  
Author(s):  
V. A. Babain ◽  
M. Yu. Alyapyshev ◽  
R. N. Kiseleva
Keyword(s):  
Nitric Acid ◽  
Acid Concentration ◽  
Alkyl Radical ◽  
Dipicolinic Acid ◽  
Nitric Acid Concentration ◽  
Metal Extraction ◽  
Acid Solutions ◽  
Concentration Increase ◽  
Nitric Acid Solutions ◽  
Radical Length

A study of americium, uranium and europium extraction by various dialkyl-diarylamides of 2,6-pyridine-dicarboxylic (dipicolinic) acid has shown that maximum extractability is achieved by using polar fluorine-substituted diluents. Generally, the diamide extractability is found to increase with the alkyl radical length. We have demonstrated the possibility to separate Am and Eu in solutions with a nitric acid concentration of 0.5–2 mol/l. The extractability of these diamides with respect to the three metals rises with the acid concentration increase to 6 mol/l.

Behaviour of uranyl ion in nitric acid solutions with ammonium molybdophosphate

1970 ◽  
Vol 32 (2) ◽  
pp. 671-679 ◽  
Author(s):  
M.T. Ganzerli Valentini ◽  
V. Maxia ◽  
M.A. Rollier ◽  
M. Barbaro Forleo
Keyword(s):  
Nitric Acid ◽  
Uranyl Ion ◽  
Acid Solutions ◽  
Nitric Acid Solutions ◽  
Ammonium Molybdophosphate
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