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The paper investigates the removing of cations praseodymium (III) in the form of dodecyl sulfates from nitrates solution with cations of the REE by calculation the separation coefficients by ion flotation process. The dependences of the distribution coefficients and the degree of recovery dodecyl sulfate praseodymium (III) on the pH of the equilibrium aqueous phase are received. Experimental results, obtained in the above process, the possible applications results in technological processes and conclusions about t...