Isolation of Uranyl peroxide from Uranium Ore

Crush 4400 g of American type uranium ore to 300 g pieces, dissolve the ore in about 8-9 L of hydrochloric acid, the uranium ore should be completely covered with hydrochloric acid, mix the solution many times and leave to react for 5 days, the solution should be neutral or acidic after completion. To get all of the uranium from the ore, 10.5% sodium hypochlorite is added with stirring, this step will make the uranium in (IV) state to (VI) state, add sodium hypochlorite excess until no more chlorine is produced, leave it to react for 1h. You may neutralize the solution to pH 0 with HCl. About 2.8 L of concentrated ammonia is added with stirring to precipitate the uranium, pH should be about 10-11 after addition. Filter the solution, discard the solution. Scope the insoluble uraniferous precipitate to 1000 mL 40% sodium carbonate solution, keep it 70°C with stirring for 4h, remove the heat source and leave it to react for 24h with stirring filter with multiple washing and discard the insoluble matter. Bring the pH of the uranyl carbonate solution to pH 4 with HCl. Start adding a huge excess of concentrated hydrogen peroxide with heating to boiling hot, until no more uranyl peroxide precipitates let it settle for 4h. Filter and dry the uranyl peroxide.

Leaching: U(IV): UO2(s) + Cl2(aq) → (UO2)2+(aq) + 2Cl(aq)

Oxidation: U(VI): UO3(s) + 2H+(aq) → (UO2)2+(aq) + H2O(l)

Neutralization: 6H+(aq) + UO2(CO3)34-(aq) → (UO2)2+(aq) + 3CO2(g) + 3H2O(l)

Precipitation: (UO2)2+(aq) + H2O2(l) → UO4·2H2O(s) + 2H+(aq) + 2H2O(l)

Source

Dissolving the ore in the acid

Addition of the hypochlorite

Addition of the ammonia

Filtration to obtain uraniferous sludge

Dissolving the uraniferous sludge in sodium carbonate solution

Filtration of the mixture to obtain uranylcarbonate solution

Acidification of the solution

Addition of the hydrogen peroxide with heating

 The pure dried product

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