Jc. Wang et Cl. Song, Hot test of partitioning strontium from high-level liquid waste (HLLW) by dicyclohexano-18crown-6 (DCH18C6), RADIOCH ACT, 89(3), 2001, pp. 151-154
The crown ether strontium extraction(CESE) process for partitioning stronti
um from HLLW was studied. A hot test was carried out in a counter current m
ode with genuine HLLW by using a miniature centrifugal contactor set. 0.1 m
ol/L DCH18C6 in 1-octanol was used as extractant. The feed solution was the
HLLW raffinate of TRPO process after removing TRU elements. Acidity of the
feed was 1.45 mol/L HNO3. In the hot test 10 extraction stages and 2 scrub
bing stages were used in the extraction section. Four stripping stages were
used in the backextraction section. The results of the hot test were very
attractive. More than 99.96% of strontium were extracted from the feed solu
tion and above 99.84% strontium was stripped out of the organic phase. Non
of the TRU elements was extracted with strontium by the extractant. Only ab
out 0.4% of Cs were extracted and found in the Sr stripping stream. The hot
test result proved that the CESE process was a promising process to remove
strontium from HLLW.