EXTRACTION OF MO(VI) FROM NITRIC-ACID SOLUTIONS BY DIPHENYL[DIBUTYLCARBAMOYLMETHYL]PHOSPHINE OXIDE

Extraction of Mo(VI) and Am(III) from nitric acid solutions by solutio ns of diphenyl[dibutylcarbamoylmethyl]phosphine oxide in fluoropol has been studied as a function of the phase contact time and concentratio ns of nitric acid, reagent, and molybdenum. Two different mechanisms o f extraction of macroamounts of Mo(VI) are observed, depending on the acid concentration: from weakly acidic solutions the polymeric forms o f molybdenum are predominantly extracted, whereas from strongly acidic solutions the monomeric nitrate complexes are extracted; equilibrium is attained within 9 h and 3 min, respectively. The possibility has be en demonstrated of americium(III) separation from molybdenum(VI) durin g reextraction with solutions of acetohydroxamic acid in 1 M nitric ac id.