Преподаватели и сотрудники

Бояринцев Александр Валентинович

Занимаемые должности

Доцент (Кафедра технологии редких элементов и наноматериалов на их основе)

Телефон

8-495-496-68-42

Сайт https://muctr.ru
Уровень образования Высшее
Квалификация

Инженер

Преподаваемые дисциплины

Химия и технология редких металлов и урана

Учёная степень

Кандидат химических наук

Наименование направления подготовки и (или) специальности

Химическая технология материалов современной энергетики

Общий стаж работы 49 лет (с 01.09.1970)
Стаж работы по специальности 23 года (с 04.10.1996)

Публикации

Reprocessing of simulated voloxidized uraniumeoxide snf in the carbex process / A. V. Boyarintsev, S. I. Stepanov, G. V. Kostikova et al. // Nuclear Engineering and Technology. — 2019. — Vol. 51. — P. 1799–1804. The concept of a new method, the CARBEX (CARBonate EXtraction) process, was proposed for reprocessing of spent uranium oxide fuel. The proposed process is based on use of water solutions of Na2CO3 or (NH4)2CO3 and solvent extraction (SE) by the quaternary ammonium compounds for selective recovery and purification of U from the fission products (FPs). Applying of SE allows to reach high degree of purification of U from FPs. Carrying out the processes in poorly aggressive alkaline carbonate media leads to increasing safety of SNF's reprocessing and better selectivity of separation of lanthanides and actinides. Moreover carbonate reprocessing media allows to carry out a recycling and regeneration of reagents. We have been done laboratory scale experiments on the extraction components of simulated voloxidated spent fuel in the solutions of NaOH or Na2CO3eH2O2 and recovery of U from carbonate solutions by SE method using carbonate of methyltrioctylammonium in toluene. It was shown that the purification factors of U from impurities of simulated FPs reached values 103e105. The received results support our opinion that CARBEX after the further development can become more safe, simple and profitable method of spent fuel reprocessing. [ DOI ]

Carbonate extraction-based refining of uranium. separation of u(vi), ce(iv) and ln(iii) from aqueous carbonate solutions with methyltrioctylammonium carbonate / A. V. Boyarintsev, L. M. Abashev, S. I. Stepanov et al. // Doklady Chemistry. — 2017. — Vol. 473, no. 2. — P. 70–73. The extraction of U(VI), Ce(IV), La(III), Nd(III), Sm(III), and Y(III) from an aqueous solution of Na2CO3 (0.25 mol/L) resulting from oxidative dissolution of U(IV) in the presence of H2O2 into a solution of methyltrioctylammonium (MTOА) carbonate (0.25 mol/L) in toluene. It was found that U(VI)/Ln(III) values vary from ∼8 to 3290 as the O : W ratio changes from 2 : 1 to 10 : 1, while U(VI)/Ce(IV) varies from ∼1.5 to 10, which allows for the extraction separation of U(VI) from Ce(IV) in a 8- to 10-stage counter-current extraction cascade and from Ln(III) in 2- to 3-stage cascade under the same conditions. [ DOI ]

Chemistry of the carbex process. identification of absorption bands of the ligands in the electronic spectra of u(vi) extracts with methyltrioctylammonium carbonate / S. I. Stepanov, A. V. Boyarintsev, A. A. Chekhlov et al. // Doklady Chemistry. — 2017. — Vol. 473, no. 1. — P. 63–66. The electronic absorption bands of extracts of the Na4[UO2(O2)(CO3)2] complex with methyltrioctylammonium (MTOA) carbonate were assigned taking into account hydration, hydrolysis, dissociation, polymerization, and ligand exchange, which occur in aqueous and organic solutions. It was shown that the extractable compound, (R4N)4[UO2(O2)(CO3)2], present in low concentrations in the organic phase partly dissociates by one step to give the (R4N)3[UO2(O2)(CO3)2]– anions, while at high concentrations, it is converted to polynuclear complex. [ DOI ]

Chemistry of the carboftorex process. identification of the absorption bands of the ligands in the electronic spectra of aqueous solutions of u(vi) fluoride carbonate complexes / A. V. Boyarintsev, S. I. Stepanov, A. A. Chekhlov et al. // Doklady Chemistry. — 2017. — Vol. 473, no. 1. — P. 43–48. The electronic absorption bands of U(VI) fluoride carbonate and fluoride hydroxide complexes were assigned taking account of dissociation, hydration, association, and ligand exchange. The absorption in the range of 190–400 nm was found to be related to the formation of neutral and dissociated anionic U(VI) fluoride carbonate and fluoride hydroxide complexes and the polynuclear Na2n[(UO2–O–UO2)F4(OH)2n – 1 ⋅ kH2O] complex. [ DOI ]

Chemistry of the carboftorex process. identification of the absorption bands of the ligands in the electronic spectra of aqueous solutions of uranyl fluoride / S. I. Stepanov, A. V. Boyarintsev, A. A. Chekhlov et al. // Doklady Chemistry. — 2017. — Vol. 473, no. 1. — P. 37–42. Abstract—The electronic absorption bands of aqueous solutions of the [UO2F2(H2O)n] complex were assigned taking into account dissociation, hydration, association, and ligand exchange. The absorption in the range of 190–400 nm was found to be related to the formation of cationic, neutral, and anionic complex species,[UO2F2(H2O)n]. [ DOI ]

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