Stoichiometric relation for extraction of uranium from UO2 powder using TBP complex with HNO3 and H2O in supercritical CO2

被引：22

作者：

Sawada, K ^{[1
]}

Uruga, K

Koyama, T

Shimada, T

Mori, Y

Enokida, Y

Yamamoto, I

机构：

[1] Nagoya Univ, Chikusa Ku, Nagoya, Aichi 4648603, Japan

[2] Japan Nucl Cycle Dev Inst, Ibaraki 3191194, Japan

[3] Mitsubishi Heavy Inds Ltd, Nucl Energy Syst Engn Ctr, Nishi Ku, Yokohama, Kanagawa 2208401, Japan

来源：

JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY | 2005年 / 42卷 / 03期

关键词：

supercritical carbon dioxide; uranium dioxide; TBP complex with HNO3 and H2O; stoichiometry; dissolution;

D O I：

10.3327/jnst.42.301

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The stoichiometry of UO2 dissolution with a tri-n-butylphosphate (TBP) complex with HNO3 and H2O was experimentally determined in supercritical carbon dioxide (SF-CO2) at 25 MPa, 323 K to estimate the required amount of the complex for a process design calculation. The molecular ratio of TBP:HNO3:H2O was determined as 1.0:1.8:0.6 when prepared as an organic phase after vigorous mixing of concentrated HNO3 and TBP. The HNO3 consumption was approximately 4 times the amount of extracted uranium. In designing a supercritical fluid extraction process, the following equation can be used to describe the overall dissolution of UO2 using the TBP complex with HNO3 and H2O in SF-CO2: UO2 + 4HNO(3) + 2TBP → UO2(NO3)(2) (.) 2TBP + 2NO(2) + 2H(2)O.

引用

页码：301 / 304

页数：4

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