| 摘要 |
Aq. H3PO4 solns. of U are extd. with solns. of alkyl pyrophosphates in org. solvents in a succession of stages, in each of which the solns. are emulsified with a shear coeff. >=5000/S and the emulsion is broken. The total time for the 2 operations is <=20 min. Thus, an aq. soln. of P2O5 360 and U 120mg/L is reduced with powd. Fe and extd. at 200L/h with 20L/h kerosine soln. cobtg. 30g/L octylpyrophosphate in 4 stages, using a centrifuged extractor at 2800 rpm to give a total extn. time in each stage of 6 min. Residual U in the H3PO4 is 2mg/L, and the make up requirement of pyrophosphate is 2.5g/L-cycle.
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