Kinetics of Dissolution of Cobalt Oxides in Acidic Media

被引：10
|
作者：
Yakusheva, E. A. [1 ]
Gorichev, I. G. [2 ]
Atanasyan, T. K. [2 ]
Lainer, Yu. A. [3 ]
机构：
[1] Bauman State Tech Univ, Vtoraya Baumanskaya Ul 5, Moscow 107005, Russia
[2] Moscow State Pedag Univ, Moscow, Russia
[3] Russian Acad Sci, Baikov Inst Met & Mat Sci, Moscow 119991, Russia
来源：
RUSSIAN METALLURGY | 2010年 / 01期
关键词：
D O I：
10.1134/S0036029510010040
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The kinetics of dissolution of cobalt oxides Co2O3 and Co3O4 in aqueous solutions of acids (H2SO4, EDTA(1)) is experimentally studied. Dissolution rate W increases with the temperature or the EDTA concentration. The reaction orders of dissolution for hydrogen ions in sulfuric acid and EDTA (dlogW/dpH = 0.5 +/- 0.1) and for anions (dlogW/dlog[An(-)] = 0.5 +/- 0.1) are determined. A specific feature of the dissolution kinetics in EDTA is a maximum in the dissolution rate of the cobalt oxides at pH -1. The activation energy of the process Ea is 70 kJ/mol in H2SO4 and 60 kJ/mol in EDTA. The modeling of the process shows that the CoOH+ ion is a surface particle controlling the dissolution rate in mineral acids and the CoHY- ion, in the complexone.
引用
收藏
页码：18 / 23
页数：6
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