Alkali Treatment of Acidic Solution from Hanford K Basin Sludge Dissolution

Technical Report · Tue Dec 22 04:00:00 EST 1998

DOI:https://doi.org/10.2172/2507· OSTI ID:2507

Bessonov, AA ^[1]; Yusov, AB; Fedoseev, AM; Gelis, AV; Garnov, AY; Delegard, CH; Plavnik, GM; Astafurova, LN; Grigoriev, MS; Budantseva, NA; Krot, NN; Nikitenko, SI; Puraeva, TP; Perminov, VP; Shilov, VP

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1. PNNL

Nitric acid solutions will be created from the dissolution of Hanford K Basin sludge. These acidic dissolver solutions must be made alkaline by treatment with NaOH solution before they are disposed to ~ the Tank Waste Remediation System on the Hanford Site. During the alkali treatments, sodium diuranate, hydroxides of iron and aluminum, and radioelements (uranium, plutonium, and americium) will precipitate from the dissolver solution. Laboratory tests, discussed here, were pefiormed to provide information on these precipitates and their precipitation behavior that is important in designing the engineering flowsheet for the treatment process. Specifically, experiments were conducted to determine the optimum precipitation conditions; the completeness of uranium, plutonium, and americium precipitation; the rate of sedimentation; and the physico-chemical characteristics of the solids formed by alkali treatment of simulated acidic dissolver solutions. These experiments also determined the redistribution of uranium, plutonium, and americium flom the sodium di~ate and iron and al&inurn hydroxide precipitates upon contact with carbonate- and EDTA-bearing simulated waste solutions. Note: EDTA is the tetrasodium salt of ethylenediaminetetraacetate.

• Research Organization: Pacific Northwest National Laboratory, Richland, WA
• Sponsoring Organization: USDOE
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 2507
• Report Number(s): PNNL-11944; ON: DE00002507
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS CHEMISTRY
40
Dissolution
Radioactive Wastes
Sludges