Extraction of Lanthanides(III) with N,N'-dimethyl-N,N'-dioctyl-3-oxy-glutaramide from Hydrochloric Acid Medium

The extraction performance and mechanism of Lanthanides(Ⅲ) with N,N′-dimethyl-N,N′-dioctyl-3-oxy-glutaramide(DMDODGA) in kerosene/n-octanol(7:3,V/V) from hydrochloric acid medium were studied.The influence of the concentration of hydrochloric acid,DMDODGA and the temperature on the extraction had been investigated.The results show that the extraction distribution ratio of Lanthanides(Ⅲ) firstly increases and then decreases with the increase in the concentration of hydrochloric acid.Extraction distribution increases with the increase in extractant concentration.The stoichiometries of the extracted species are MCl3·2DMDODGA(M=Sm,Gd,Dy) or MCl3·DMDODGA(M=Er,Lu).The distribution ratio decreases with the increase in the temperature,and the extraction reaction is exothermic.The IR spectra of the extracted species indicates that the carbonyl oxygen and etheric oxygen of DMDODGA are all coordinated with lanthanide ions.