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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 48 лет (с 01.09.1970)
Стаж работы по специальности 22 года (с 04.10.1996)

Публикации

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 ]

High-temperature interaction of components of spent uranium nuclear fuel with alkali metal carbonates in the course of voloxidation in the carbex process / A. M. Chekmarev, M. V. Vazhenkov, S. I. Stepanov et al. // Radiochemistry. — 2017. — Vol. 59, no. 4. — P. 341–344. Interaction of UO2, U3O8, ZrO2, Nb2O5, CeO2, Ce2O3, Pr6O11, Eu2O3, Yb2O3, Tb7O12, and Rb metal with lithium, sodium, and potassium carbonates in the temperature interval 300–900oС was studied using methods of thermal analysis and X-ray diffraction. The major products of the high-temperature reactions are alkali metal uranates and diuranates, and in the case of ZrO2, Nb2O5, and lanthanide oxides, oxides of metals in higher oxidation states and salts of the corresponding metal-containing acids, formed by reactions of the oxides with sodium carbonate. [ DOI ]

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