The dissolution of uranium oxides: Thermodynamic and kinetic investigations

被引：5

作者：

Bensmain, Belkacem ^{[1
,2
]}

Chegrouche, Salah ^{[1
]}

Barkat, Mahfoud ^{[1
]}

Mellah, Abdelhamid ^{[1
]}

Nibou, Djamel ^{[2
]}

机构：

[1] Algerian Atom Energy Commiss, Nucl Res Ctr Draria, BP 43, Algiers 16003, Algeria

[2] USTHB, Mat Technol Lab, BP 32, Algiers 16111, Algeria

来源：

HYDROMETALLURGY | 2016年 / 160卷

关键词：

Uranium oxide; Uranyl nitrate; Thermodynamic study; Kinetic study; NITRIC-ACID SOLUTIONS; DIOXIDE; PRECIPITATION; CARBONATE; POWDERS; PELLETS; NITRATE; AUC;

D O I：

10.1016/j.hydromet.2015.12.003

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

This work investigates the dissolution of various uranium oxides in nitric acid medium and the most predominant occurring reaction was determined on the basis of the thermodynamic and kinetic studies. Six uranium oxides were dissolved and studied. The Gibbs free energies of all the reactions Delta(r)G degrees(T) were analyzed by Ulich model (Ulich, 1930) and the predominant dissolution reaction was found to be: 3U(3)O(8(s)) + 20HNO(3(aq)) -> 9 UO2 (NO3)(2(aq)) + 2NO((g)) + 10H(2)O Three reaction order rate models namely the first, the second and the third order were applied on the predominant reaction reported above. According to the kinetics results, our reaction best fits the second order equation rate. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：73 / 78

页数：6

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