Phase separation rate is a critical character in determining the usefulness of a solvent extraction system in hydrometallurgy. A survey of the synergistic mixture containing dinonylnaphthalene sulfonic acid (HDNNS) an...Phase separation rate is a critical character in determining the usefulness of a solvent extraction system in hydrometallurgy. A survey of the synergistic mixture containing dinonylnaphthalene sulfonic acid (HDNNS) and 2-ethylhexly 4-pyridinecarboxylate ester (4PC) for the extraction of cobalt from acidic single metal sulfate solution was carried out to suggest how the physicochemical properties and the morphology of the reverse micelles in the loaded organic phase affect the phase separation. The results show that effective parameters affecting the phase separation are the viscosity and the excess water uptake of the loaded organic phase. It is obvious that the specific settling rate (SSR) decreases with the apparent increase of these two parameters. The measurement of small angle X-ray scattering (SAXS) proves that the morphology of the reversed micelles in the loaded organic phase changes evidently with the change of the specific settling rate (SSR).展开更多
The microemulsion behaviors of europium and sodium salts of naphthenic acid were studied using fluorescence measurements. It was found that 5D0 decay coefficient of europium was 2.08 ms-1 for 100%europium naphthenate,...The microemulsion behaviors of europium and sodium salts of naphthenic acid were studied using fluorescence measurements. It was found that 5D0 decay coefficient of europium was 2.08 ms-1 for 100%europium naphthenate, and the coefficients were 1.56, 1.08 and 0.83 ms-1 for 75%, 50% and 20%europium salt of sodium saponified acid respectively. It can be seen that the decay coefficients were also 2.08 ms-1 at the inflexion of curves in the 75%, 50%and 20%europium naphthenate systems with water content. The data reveal that, if there is enough water in the microemulsion, the coordination condition of europium ion in the above microemulsion is similar. It was also found that, for the 75%、60%、50%、40%and 20%europium naphthenate microemulsion systems, the relative fluorescence intensities sharply decrease with the increase of water content and reach a steady values at the same water content.展开更多
基金Project(2014CB643401) supported by the National Basic Research Program of ChinaProject(51674294) supported by the National Natural Science Foundation of ChinaProject(2016TP1007) supported by the Hunan Provincial Science and Technology Plan,China
文摘Phase separation rate is a critical character in determining the usefulness of a solvent extraction system in hydrometallurgy. A survey of the synergistic mixture containing dinonylnaphthalene sulfonic acid (HDNNS) and 2-ethylhexly 4-pyridinecarboxylate ester (4PC) for the extraction of cobalt from acidic single metal sulfate solution was carried out to suggest how the physicochemical properties and the morphology of the reverse micelles in the loaded organic phase affect the phase separation. The results show that effective parameters affecting the phase separation are the viscosity and the excess water uptake of the loaded organic phase. It is obvious that the specific settling rate (SSR) decreases with the apparent increase of these two parameters. The measurement of small angle X-ray scattering (SAXS) proves that the morphology of the reversed micelles in the loaded organic phase changes evidently with the change of the specific settling rate (SSR).
文摘The microemulsion behaviors of europium and sodium salts of naphthenic acid were studied using fluorescence measurements. It was found that 5D0 decay coefficient of europium was 2.08 ms-1 for 100%europium naphthenate, and the coefficients were 1.56, 1.08 and 0.83 ms-1 for 75%, 50% and 20%europium salt of sodium saponified acid respectively. It can be seen that the decay coefficients were also 2.08 ms-1 at the inflexion of curves in the 75%, 50%and 20%europium naphthenate systems with water content. The data reveal that, if there is enough water in the microemulsion, the coordination condition of europium ion in the above microemulsion is similar. It was also found that, for the 75%、60%、50%、40%and 20%europium naphthenate microemulsion systems, the relative fluorescence intensities sharply decrease with the increase of water content and reach a steady values at the same water content.
