Mechanism of extraction of Fe (III) from sulphate solution by primary amine N1923 and stripping of Fe loaded organic phase with dilute H_2SO_4 was investigated. The organic phase was characterized by FT-IR and photon ...Mechanism of extraction of Fe (III) from sulphate solution by primary amine N1923 and stripping of Fe loaded organic phase with dilute H_2SO_4 was investigated. The organic phase was characterized by FT-IR and photon correlation spectroscopy. The composition of extracted species as well as the content of H_2O in organic phase were determined. The dependence of both the rate of extraction and stripping on the formation of reverse micelle in primary amine (N1923)system has been confirmed. It is shown that the extraction of Fe(III) by primary amine sulphate may be related to the adduct formation or cation exchange reaction under different concentrations of H_2SO_4 in aqueous solution.展开更多
Separation of Th4+ and RE3+ was investigated by hollow fiber membrane extraction with N1923 in countercurrent recirculating operation. The effect of H+ concentration in aqueous phase and flow rates of aqueous and orga...Separation of Th4+ and RE3+ was investigated by hollow fiber membrane extraction with N1923 in countercurrent recirculating operation. The effect of H+ concentration in aqueous phase and flow rates of aqueous and organic phases on mass transfer coefficient was tested. Then the extraction of Th4+ from RE sulfate obtained from Baotou ore was carried out. The results obtained show that the mass transfer coefficient of Th4+ changes with the flow rate of aqueous phase, but does not change with the flow rate of organic phase and H+ concentration in aqueous phase, which suggests that the mass transfer rate of Th4+ is controlled by that in the water critical layer. The mass transfer rate of RE3+ does not change with the flow rate of water phase, changes a little with the flow rate of organic phase, and changes with H+ concentration, which suggests that the mass transfer rate is controlled by their reaction rate with N1923. Th4+ could be extracted completely in 8 h from RE sulfate solution of Baotou ore withrelatively less extraction of RE3+. So the separation of radioactive element under the sealed condition could be done.展开更多
The interfacial properties of extractants (or surfactants) such as primary amine N 1923 ,trioctylamine (TOA), Tri n octylphosphine Oxide (TOPO),tributyl phosphate(TBP) and sodium dodecyle sulphonate (SDS),were studied...The interfacial properties of extractants (or surfactants) such as primary amine N 1923 ,trioctylamine (TOA), Tri n octylphosphine Oxide (TOPO),tributyl phosphate(TBP) and sodium dodecyle sulphonate (SDS),were studied at (294±1)K.The interfacial adsorption parameters, c min , A I,were calculated respectively.The effect of additives on the interfacial tensions were discussed.These results could be used to explain and assume the extraction rate or mechanism.展开更多
文摘Mechanism of extraction of Fe (III) from sulphate solution by primary amine N1923 and stripping of Fe loaded organic phase with dilute H_2SO_4 was investigated. The organic phase was characterized by FT-IR and photon correlation spectroscopy. The composition of extracted species as well as the content of H_2O in organic phase were determined. The dependence of both the rate of extraction and stripping on the formation of reverse micelle in primary amine (N1923)system has been confirmed. It is shown that the extraction of Fe(III) by primary amine sulphate may be related to the adduct formation or cation exchange reaction under different concentrations of H_2SO_4 in aqueous solution.
文摘Separation of Th4+ and RE3+ was investigated by hollow fiber membrane extraction with N1923 in countercurrent recirculating operation. The effect of H+ concentration in aqueous phase and flow rates of aqueous and organic phases on mass transfer coefficient was tested. Then the extraction of Th4+ from RE sulfate obtained from Baotou ore was carried out. The results obtained show that the mass transfer coefficient of Th4+ changes with the flow rate of aqueous phase, but does not change with the flow rate of organic phase and H+ concentration in aqueous phase, which suggests that the mass transfer rate of Th4+ is controlled by that in the water critical layer. The mass transfer rate of RE3+ does not change with the flow rate of water phase, changes a little with the flow rate of organic phase, and changes with H+ concentration, which suggests that the mass transfer rate is controlled by their reaction rate with N1923. Th4+ could be extracted completely in 8 h from RE sulfate solution of Baotou ore withrelatively less extraction of RE3+. So the separation of radioactive element under the sealed condition could be done.
文摘The interfacial properties of extractants (or surfactants) such as primary amine N 1923 ,trioctylamine (TOA), Tri n octylphosphine Oxide (TOPO),tributyl phosphate(TBP) and sodium dodecyle sulphonate (SDS),were studied at (294±1)K.The interfacial adsorption parameters, c min , A I,were calculated respectively.The effect of additives on the interfacial tensions were discussed.These results could be used to explain and assume the extraction rate or mechanism.
