Processing NPP Bottoms by Ferrocyanide Precipitation Page: 5 of 9
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WM'02 Conference, February 24-28, 2002, Tucson, AZ
Bottoms after ozonization of the first set were investigated also on cleaning from 137Cs and 60Co
depending on pH at separate filtering of a deposit after ozonization and ferrocyanide precipitation.
A filtration after ozonization was carried out at pH 12,3, and after ferrocyanide precipitation at
different pH. Both filtrations were carried out through the double paper filter a blue tape .
Ferrocyanide precipitation was carried out in stoichiometry of reagents. The factors of cleaning
from 137Cs and 60Co in a range pH 8,7 - 10,4 varied unsignificantly and amounted 170 - 280 on
137Cs, and - 450 - 590 on 60Co. At pH 11,5 cleaning of bottoms from 137Cs and 60Co was much
The release of 137Cs at ferrocyanide precipitation with a different ratios of reagents was
investigated. Ferrocyanide precipitation was carried out in four various conditions:
1 - 50 % surplus of Ni(NO3)2 at pH=9;
2 - 50 % surplus K4Fe(CN)6 at pH=9;
3 - in stoichiometry of reagents at pH=9;
4 - introduction of reagents at pH=12,1, and then correction up to pH=9.
As a result of these experiments was established, that:
* The separation of deposits after ozonization and ferrocyanide precipitation can be
carried out both separately, and jointly;
* ferrocyanide precipitation allows to diminish specific activity of bottoms on Cs137
after ozonization more than in 100 times;
" Sufficient concentration of a ferrocyanide deposit is 1 g/l;
" pH = 8, 7 - 10;
" For simplification of deposit separation it is necessary to carry out precipitation at
surplus of Ni(NO3)2;
* The introduction of reagents and correction of pH can be carried out in any
To carry out experiments on additional cleaning with sorbent after ozonization and ferrocyanide
precipitation ozonied bottoms were filtered through the double filter a blue tape , then pH was
corrected by a nitric acid up to 9, K4Fe(CN)6 and Ni(NO3)2 with surplus of Ni were added at 1 g/l
of a deposit. The formed deposit was separated on the double filter blue tape . The specific
activity of filtrate was equal to: 137Cs - 1,2*105 Ci/1, 60Co - 3,9*10-8 Ci/1.
But, as the further experiments on sorption Cs from bottoms after ozonization and ferrocyanide
precipitation shown, the filtration on blue tape is unsufficient. At realization of sorption on
Termoxid-35 through two consequently connected columns factor of cleaning from Cs constituted
only 30 - 200 on two columns (see table. III).
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Savkin, A. E.; T., Slastennikov Y. & G., Sinyakin O. Processing NPP Bottoms by Ferrocyanide Precipitation, article, February 25, 2002; Tucson, Arizona. (digital.library.unt.edu/ark:/67531/metadc785551/m1/5/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.