Method for separating praseodymium and neodymium through liquid-liquid-liquid three-phase external push-pull system
A system and three-phase technology, applied in chemical instruments and methods, improvement of process efficiency, inorganic chemistry, etc., can solve problems such as inability to separate, inability to separate with praseodymium and neodymium, and inability to obtain a three-layer liquid phase coexistence system, to achieve The effect of high separation coefficient and wide application range
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Embodiment 1
[0041] Dissolve the oxides of praseodymium and neodymium in 100mL of nitric acid solution with a concentration of 0.1mol / L, and prepare a mixed aqueous solution containing praseodymium and neodymium ions (the initial concentration of praseodymium ions is 30mmol / L, and the initial concentration of neodymium ions is 10mmol / L). At room temperature, add sodium nitrate, the ratio of the added molar amount to the molar amount of praseodymium ions in the initial aqueous solution is 200:1, adjust the pH value of the mixed aqueous solution to 1, and mix thoroughly. Then, 20 g of tributylmethylammonium nitrate was added to the mixed aqueous solution, and after being thoroughly mixed at room temperature, the phases were separated by centrifugation to obtain an ionic liquid two-phase aqueous system in which upper and lower liquid phases coexist. Then, add the n-dodecane solution of 10mL P507 to this ionic liquid two-phase aqueous system, the volume percent of P507 in the n-dodecane solutio...
Embodiment 2
[0043] Dissolve the oxides of praseodymium and neodymium with 100mL of hydrochloric acid aqueous solution with a concentration of 0.1mol / L, and prepare a mixed aqueous solution containing praseodymium and neodymium ions (the initial concentration of praseodymium ions is 10mmol / L, and the initial concentration of neodymium ions is 30mmol / L). At room temperature, add lithium nitrate, the ratio of the added molar amount to the molar amount of neodymium ions in the initial aqueous solution is 300:1, adjust the pH value of the mixed aqueous solution to 3, and mix thoroughly. Then, 40 g of 1-ethyl-3-methylimidazolium tetrafluoroborate was added to the mixed aqueous solution, mixed thoroughly at room temperature and then centrifuged to separate phases to obtain an ionic liquid two-phase aqueous system in which upper and lower liquid phases coexist. Then, add 3mL of n-octane solution of P204 to this ionic liquid two-phase aqueous system, the volume percentage of P204 in n-octane soluti...
Embodiment 3
[0045]Dissolve the oxides of praseodymium and neodymium with 100mL of nitric acid aqueous solution with a concentration of 0.1mol / L, and prepare a mixed aqueous solution containing praseodymium and neodymium ions (the initial concentration of praseodymium ions is 100mmol / L, and the initial concentration of neodymium ions is 100mmol / L). At room temperature, add ammonium nitrate, the ratio of the added molar amount to the molar amount of praseodymium ions in the initial aqueous solution is 60:1, adjust the pH value of the mixed aqueous solution to 2, and mix thoroughly. Then, 10 g of tributylmethylammonium nitrate was added to the mixed aqueous solution, and after being thoroughly mixed at room temperature, the phases were separated by centrifugation to obtain an ionic liquid two-phase aqueous system in which upper and lower liquid phases coexist. Then, add the n-dodecane solution of 5mL Cyanex272 to this ionic liquid two-phase aqueous system, the volume percent of Cyanex272 in n...
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