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Rare earth metal sepn. by solvent extn. - by contacting with water-immiscible organic solvent contg. 2-ethyl-hexyl phosphonic mono-2-ethyl-hexyl ester as extractant
Rare earth metal sepn. by solvent extn. - by contacting with water-immiscible organic solvent contg. 2-ethyl-hexyl phosphonic mono-2-ethyl-hexyl ester as extractant
Rare earth metals are sepd. from each other by solvent extn. by contacting a rare earth metals-contg. aq. soln. with a water-immiscible organic solvent, e.g. kerosene, etc., contg. as an extracting agent 2-ethylhexylphosphonic mono-2-ethylhexyl ester to extract =1 rare earth metal from the aq. phase due to the formation of a water-insol. and organic phase-soluble complex salt between the rare earth metal(s) and the extracting agent, and subsequently contacting the organic phase with an aq. inorganic acid-contg. phase to transfer by back-extn. the rare earth metal(s) to the aq. phase. The H+ concn. of the aq. phase is kept under lower value in the extn. procedure, and kept under higher value in the back-extraction. procedure, thereby the amt. of the inorganic acid, e.g. HCl, necessitated for the back-extn. is lowered in a large extent. Process is applied for the sepn. of the rare earth metals from other difficult-extractable metals.
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机译：稀土金属为sepd。通过溶剂萃取彼此分离。通过接触稀土金属接触。水soln。与水不混溶的有机溶剂，例如煤油等，续作为萃取剂2-乙基己基膦酸单-2-乙基己酯从水溶液中萃取> = 1的稀土金属。由于水溶胶的形成而形成相。在稀土金属和萃取剂之间形成有机相可溶的络合盐，随后使有机相与碳酸氢钠水溶液接触。含无机酸的相通过反向扩展进行传输。水溶液中的稀土金属。相。 H +浓度的水相位在外部保持较低的值。程序，并在反提取中保持较高的价值。程序，从而进行修改。无机酸如HCl，用于反萃取。在很大程度上降低了。该过程适用于sepn。来自其他难提取金属的稀土金属。
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