Uranium extraction process

A process for extracting uranium from a wet process phosphoric acid containing uranium, which process comprises contacting said phosphoric acid, which contains 35-60% by weight of P.sub.2 O.sub.5 and uranium at least some of which is in the hexavalent state, with a solution in an inert non polar water immiscible organic solvent of a neutral phosphorus compound of formula ##STR3## where each of a, b and c, which are the same or different, is 0 or 1, and each of R.sup.1, R.sup.2 and R.sup.3, which are the same or different, is an alkyl, cycloalkyl or alkenyl group, and an acid ester of formula (R.sup.4 O).sub.2 PO(OH), where R.sup.4 is as defined for R.sup.1 -R.sup.3, and wherein said phosphoric acid containing uranium contains nitrate ion in an amount between 0.05 and 10% to form an organic extract phase containing uranium and an aqueous phosphoric acid, which are separated.