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  • Author or Editor: A. Haggag x
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Abstract  

A systematic investigation was carried out on the extraction of Sb(III) and (V) with HDEHP from various acidic, neutral and alkaline solutions. Antimony(III) is best extracted from neutral or slightly acidic solutions, and the E values are nearly the same in the forward and backward extractions. Antimony(V) extraction is high only from concentrated HCl and HClO4, and the E values are much larger in the backward direction. Extraction and separation of Sb(III) and (V) was studied as a function of acidity, alkalinity, anion and water-miscible organic additives in the aqueous phase, as well as the diluent used and HDEHP molarity. Separation factors obtained for Sb(III) and (V) were higher than when using isopropyl ether as solvent, which was hitherto used for this purpose.

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Abstract  

Very economical, rapid and pure methods for the production of115mIn and113mIn from115Cd and113Sn, respectively are described. The methods are based on the extraction of115mIn by o-xylene from 7.2M H2SO4 −0.06M HBr, and its reextraction with ≈11M H2SO4 −0.06M HBr from n-hexane. The γ-spectra of the generated115mIn and113mIn indicate that they are free from any other interferences.

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Abstract  

A rapid method for the production of115mIn from irradiated cadmium is described. The procedure of the method is based on the extraction of115mIn by bis(2-ethyl hexyl) phosphoric acid (HDEHP) from 0.1N sulphuric acid. Accumulated115mIn can then be reextracted into diluted hydrochloric, hydrobromic, nitric or sulphuric acid solutions with a concentration of 1N or higher. A summary on the behaviour of cadmium and indium extraction with the solvent was given as a preliminary step in the present study. The produced115mIn was found to be free from any cadmium as well as from any other foreign activity.

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Abstract  

A systematic study is presented on the extraction of60Co and65Zn bromides and chlorides from H2SO4 with tri-n-butyl phosphate (TBP) and Amberlite LA-2. It has been found that the presence of a little HBr or HCl enhances the extraction of the two isotopes with both solvents. The extractions of60Co and65Zn have been studied as functions of the acidity (HBr, HCl or H2SO4) in the aqueous phase, and of the diluent and solvent concentrations in the organic phase. The presence of water-miscible alcohols or acetone enhances extraction. A suggested extraction mechanism is presented in the light of the obtained results.

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Abstract  

The extraction of Fe, Zn and In by La2HCl from H2SO4 solutions has been studied. The formation of the aqueous complexes H2Fe(SO4)2HSO4, HZn(SO4)HSO4 and HInSO4(HSO4)2 is discussed. The formation of mixed ligand species H2Fe(SO4)2Cl, HZnSO4Cl and HInSO4Cl2 from the interaction of Cl+ in aqueous solution or in LA2HCl before extraction is explained. The reactions in the system to produce the extractable species are discussed. The possible separations are given.

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Abstract  

A systematic study on the extraction of tantalum fluoride from various acidic solutions and mixed media has been given using HDEHP, TBP and LA-2 as solvents. The results obtained for these three solvents clarify the ionic behaviour of tantalum. The separation of tantalum from other elements is discussed.

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Abstract  

The equilibrium and rate of solvent extraction of FeCl3 complexes from HCl solutions into benzene solutions of tributyl phosphate (TBP) has been studied. The extracted species was found to be FeCl3·3TBP. The results show that the extraction is first order in both Fe(III) and TBP. The rate constant of adduct formation equals ∼1.24M min−1. The reaction order is zero for the aqueous phase acidity. The rate-controlling steps are discussed in the light of the results.

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Abstract  

A systematic study on the extraction of99Mo and its daughter99mTc by pure organic diluents and dinonylnaphthalinesulfonic acid (DNNS) is described. The aqueous phases used are H2SO4, HCl, KI and their binary mixture solutions. The effect of alcohols on the distribution coefficient has been investigated. As a result of the study, a simple and rapid generator is built for the production of pure99mTc from99Mo.

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Abstract  

The extraction of Fe(III) and Fe(II) from various aqueous acidic solutions, with nitrobenzene, Amberlite LA-2, TBP and HDEHP is described. Conditions are given for the separation of Fe(III) from Fe(II). The extraction and separation of Fe(III) and Fe(II) is most adequate from HCl solutions, using the four solvents. The extraction of iron halides from H2SO4 solutions has been studied. The effect of water-miscible alcohols on the distribution of Fe(III) and Fe(II) was also studied. Extraction equilibria and mechanisms were proposed on the basis of the obtained results.

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Abstract  

The extraction of Eu with Amberlite LA-2, TBP and HDEHP from HF, HCl, HBr, H2SO4, CH3 COOH and KI solutions was investigated. The extraction of Eu with TBP and LA-2 is small over a wide range of concentrations. The extraction of Eu with HDEHP from HCl, HBr, and H2SO4 is inversely proportional to the third power of the acid concentration, while the extraction from KI is proportional to the square of the extractant concentration. The extraction by the three extractants from H2SO4 in presence of small amounts of hydrogen halides is small. These extraction data can be used to separate Eu from Th and many of the fission products. The presence of water-miscible alcohols and acetone generally increases the extraction of Eu from H2SO4 and KI solutions.

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