Dynamic tests of cesium-137 recovery from the Mayak model alkaline HLW using p-isononylcalix[6]arene based extractant

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The article presents the results of studies on composition optimization, properties, and laboratory dynamic tests of extraction mixtures based on p-isononylcalix[6]arene for the alkaline HLW purification to remove 137Cs. The distribution of 137Cs among the products of the technological scheme is presented and the coefficients of raffinate purification to remove 137Cs are determined. It was revealed that, in the case of using nitric acid as a stripping solution, nitrosation of p-isononylcalix[6]arene is possible in the technological process. The composition of the resulting product was determined. To prevent nitrosation of p-isononylcalix[6]arene, formic acid was used in the stripping stage, which ensured stable operation of the extraction stand for 48 h with 137Cs extraction from model alkaline HLW at a level of 99.7%.

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作者简介

A. Yumaguen

St. Petersburg State University; Mayak Production Association; Ozyorsk Institute of Technology

编辑信件的主要联系方式.
Email: cpl@po-mayak.ru
俄罗斯联邦, St. Petersburg; Ozyorsk; Ozyorsk

E. Babitova

St. Petersburg State University; Khlopin Radium Institute

Email: cpl@po-mayak.ru
俄罗斯联邦, St. Petersburg; St. Petersburg

M. Logunov

Mayak Production Association

Email: cpl@po-mayak.ru
俄罗斯联邦, Ozyorsk

M. Karavan

St. Petersburg State University; Khlopin Radium Institute

Email: cpl@po-mayak.ru
俄罗斯联邦, St. Petersburg; St. Petersburg

P. Kozlov

Mayak Production Association; Ozyorsk Institute of Technology

Email: cpl@po-mayak.ru
俄罗斯联邦, Ozyorsk; Ozyorsk

A. Konnikov

Mayak Production Association

Email: cpl@po-mayak.ru
俄罗斯联邦, Ozyorsk

I. Smirnov

St. Petersburg State University; Khlopin Radium Institute

Email: igor_smirnov@khlopin.ru
俄罗斯联邦, St. Petersburg; St. Petersburg

参考

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2. Fig. 1. Structural formula of IN6.

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3. Fig. 2. Mass spectrum of IN6 (m/z 1417 – molecular peak [C96H144O6Na]+).

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4. Fig. 3. IR spectrum of IN6 (ν – stretching, δ – deformation, ω – fan, t – torsional, ρ – pendulum, Ar – vibrations of the aromatic system).

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5. Fig. 4. Laboratory extraction unit of the “mixer-settler” type.

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6. Fig. 5. Schematic diagram of the power supply unit.

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7. Fig. 6. Extraction of cesium from aqueous solutions (pH 13.6) with organic phases containing from 0 to 15 vol% solubilizer.

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8. Fig. 7. Dependences of the metal distribution coefficient on the pH of the initial aqueous phase during their extraction with a solution of 40 g/dm3 IN6 in C2Cl4.

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9. Fig. 8. Isotherm of cesium extraction with a 40 g/dm3 solution of IN6 in C2Cl4 (a) and the dependence of lgDCs on lgC(IN6) at pH 13.64 and constant ionic strength (b).

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10. Fig. 9. Distribution of 137Cs by technological products.

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11. Fig. 10. Content of 137Cs in technological products.

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12. Fig. 11. Distribution of 137Cs in products by stages and its distribution coefficients in extraction (a) and re-extraction (b) blocks.

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13. Fig. 12. IR-ATR spectra of p-quinone, nitrosated and initial IN6.

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