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Reagent decontamination of the finely dispersed fraction of soils

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Abstract

The possibilities of reagent treatment of the finely dispersed (<0.1 mm) fraction of soils by agitation leaching at 80°C for 7 h at the liquid to solid ratio of 2: 1 were examined. The reagents were 2–8 M H2SO4 and mixtures of H2SO4 with H3PO4 and NH4F. The maximal attained decontamination factor (DF) does not exceed 8–10, and the soil loss for the dissolution does not exceed ∼12%. Reagent treatment with 1–5 M sulfuric acid in a pressure vessel in the temperature range 80–140°C allowed the maximal DF value of ∼70 to be attained, with the soil weight loss reaching 15% and acid consumption, 3 mol per kilogram of soil. The reagent treatment of the finely dispersed fraction can be successfully combined with the decontamination method based on separation of the finely dispersed fraction by gravity sedimentation in water, especially at a high content of the finely dispersed substance.

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Authors and Affiliations

  1. Joint Environmental, Technological, and Research Center for Radioactive Waste Management and Environment Protection (Radon Moscow Research and Production Association State Unitary Enterprise), 7-i Rostovskii per. 2/14, Moscow, 119121, Russia

    S. A. Dmitriev, A. S. Barinov & V. M. Kuptsov

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  1. S. A. Dmitriev
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  2. A. S. Barinov
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  3. V. M. Kuptsov
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Correspondence to S. A. Dmitriev.

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Original Russian Text © S.A. Dmitriev, A.S. Barinov, V.M. Kuptsov, 2011, published in Radiokhimiya, 2011, Vol. 53, No. 6, pp. 565–567.

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Dmitriev, S.A., Barinov, A.S. & Kuptsov, V.M. Reagent decontamination of the finely dispersed fraction of soils. Radiochemistry 53, 669–672 (2011). https://doi.org/10.1134/S1066362211060178

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  • DOI: https://doi.org/10.1134/S1066362211060178

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