Adsorption-extraction mechanism of heavy rare earth by Cyanex272-P507 impregnated resin

Instrument of IR spectrometer and methods of saturation, equimolar series change and slope were applied to study the extraction mechanism of Cyanex272-P507 impregnated resin for heavy rare earths from hydrochloric acid solution. The results show that the molar ratio of Cyanex272-P507 to rare earth in the extraction complex is 3. Chlorine ions do not participate in coordination. The extraction reaction can be expressed as RE3+(a)+3/2 HA(r)+3/2HL(r) = [REA(3/2)L(3/2)](r)+3H(+) (a) (where HA represents Cyanex272 and HL represents P507). The synergic extractant formed in extraction chromatography is in a form of monopolymer and with a chemical structure of REA(3/2)L(3/2).