Gas-Phase Conversion of Oxide Phases of Lanthanides and Uranium to Water-Soluble Compounds

被引：0

作者：

Nevolin, Yu. M. ^{[1
,2
]}

Kulyukhin, S. A. ^{[1
]}

Gordeev, A. V. ^{[1
]}

Bessonov, A. A. ^{[1
]}

Kalmykov, S. N. ^{[1
]}

机构：

[1] Russian Acad Sci, Frumkin Inst Phys Chem & Electrochem, Moscow 119071, Russia

[2] Lomonosov Moscow State Univ, Moscow 119991, Russia

来源：

RADIOCHEMISTRY | 2020年 / 62卷 / 03期

基金：

俄罗斯基础研究基金会;

关键词：

uranium; rare-earth elements; oxides; gas-phase conversion; nitric acid; nitrogen oxides; SPENT NUCLEAR-FUEL; THERMAL-DECOMPOSITION; ZR OXIDES; SR; MO; ZIRCONIUM; STATE; UO2; XPS;

D O I：

10.1134/S1066362220030042

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Gas-phase conversion to water-soluble compounds of individual rare-earth element (REE) (La, Ce, Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm, Lu) oxides and oxide systems (U,Ce)O(x)and (U,Nd)O(x)in the atmospheres HNO3(vapor)-air and NOx-H2O (vapor)-air was examined. It was shown that water-soluble compounds are formed in the gas-phase conversion of REE oxides in the atmosphere of both HNO(3)vapor and NO(x)gases. In the case of (U,Ce)O(x)in the atmosphere of HNO3(vapor)-air, water-soluble compounds of uranium are formed, with a part of cerium remaining in the phase of the water-insoluble precipitate. The conversion of (U,Nd)O(x)under the same conditions yields water-soluble compounds of both uranium and neodymium. It was found that these gas media can be used in principle to extract uranium from fuel systems containing rare-earth elements.

引用

页码：317 / 330

页数：14

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