Recovery of uranium

1. A process for recovering uranium comprising

(A) bringing a solution (A) into contact with a resin (A) to produce a mixture of solution (B) comprising dissolved uranium and uranium-depleted resin (B), wherein the solution (A) is an aqueous solution comprising dissolved sodium carbonate, sodium bicarbonate, or a mixture thereof, and wherein the resin (A) is a strong acid cation exchange resin that comprises one or more cationic moiety that comprises uranium and one or more cationic moiety that comprises iron, and

(B) separating the solution (B) from the resin (B);

wherein the strong acid cation exchange resin is a polymer wherein 50 mole % or more of the polymerized units comprise one or more covalently bonded sulfonate group, and wherein the sulfonate group is present in protonated form, in a neutralized form involving one or more cations other than H + , in ionic form, or in a mixture thereof.

2. The process of claim 1 , wherein the process further comprises the steps, prior to step (A), of

(W) bringing a solution (W) into contact with a resin (W) to produce a mixture of a solution (X) comprising water and sufficient ammonium hydroxide or sodium hydroxide to raise its pH to at least 8 and a resin (X),

wherein the resin (W) is a strong acid cation exchange resin that comprises one or more cationic moiety that comprises uranium, one or more cationic moiety that comprises iron, and one or more cationic moiety that is a hydrogen atom,

wherein the solution (W) is an aqueous solution that has pH of 8 or higher and that comprises dissolved NaOH or dissolved NH4OH or a mixture thereof;

(X) separating the solution (X) from the resin (X); and

(Y) after the step (X), using the resin (X) as the resin (A) in the step (A).

3. The process of claim 2 , wherein the process further comprises the steps, prior to the step (W), of

(R) bringing a solution (R) into contact with a resin (R) to produce a mixture of a uranium-depleted solution (S) and a resin (S) comprising uranium, wherein the solution (R) is an aqueous solution that comprises 30 to 200 g/L sulfuric acid and that comprises 1 to 50 g/L uranium, and wherein the resin (R) is a strong acid cation exchange resin,

(S) separating the solution (S) from the resin (S);

(T) after the step (S), using the resin (S) as the resin (W) in the step (W).

4. The process of claim 1 , wherein the process further comprises the steps, prior to the step (A), of

(R) bringing a solution (R) into contact with a resin (R) to produce a mixture of a uranium-depleted solution (S) and a resin (S) comprising uranium, wherein the solution (R) is an aqueous solution that comprises 30 to 200 g/L sulfuric acid and that comprises 1 to 50 g/L uranium, and wherein the resin (R) is a strong acid cation exchange resin;

(S) separating the solution (S) from the resin (S); and

(T) after the step (S), using the resin (S) as the resin (A) in the step (A).

5. The process of claim 1 , wherein the process further comprises the steps, after the step (A), of

(C) bringing a solution (C) into contact with the resin (B) to produce a mixture of a solution (D) comprising iron and an iron-depleted resin (C), wherein the solution (C) is an aqueous solution that comprises dissolved H 2 SO 4 and dissolved Na 2 SO 4 , and

(D) separating the solution (D) from the resin (C).

6. The process of claim 1 , wherein the process further comprises the steps, subsequent to the step (B), of

(E) forming a mixture of a solution (E) and said solution (B), to form a mixture of a solution (F) comprising a metal carbonate and a precipitate (F) comprising a diuranate salt, wherein the solution (E) is an aqueous solution that comprises dissolved sodium hydroxide, dissolved ammonium hydroxide, or a mixture thereof; and

(F) separating the solution (F) from the precipitate (F).