Iron sulfamate solvent extraction

The kerosene fraction is now subjected to a second solvent extraction. Addition of iron(II) sulfamate, Fe(NH2S03)2, and shaking of the kerosene fraction with water, results in the formation of plutonium(III) nitrate which is partitioned into the aqueous layer. [U02][N03]2 resists reduction, is com-plexed by TBP and remains in the organic layer. Separation of the two solvent fractions thus separates the uranium and plutonium salts repeated extractions result in a highly efficient separation. The extraction of [U02][N03]2 from kerosene back into an aqueous phase can be achieved by adding nitric acid under these conditions, the uranium-TBP complex dissociates and [U02][N03]2 returns to the aqueous layer. 

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