Thiocyanate hydrometallurgy for the recovery of gold Part III: Thiocyanate stability

被引：12
|
作者：
Li, Jinshan [1 ]
Safarzadeh, M. Sadegh [1 ]
Moats, Michael S. [1 ]
Miller, Jan D. [1 ]
LeVier, K. Marc [2 ]
Dietrich, Meg [2 ]
Wan, Rong Yu
机构：
[1] Univ Utah, Coll Mines & Earth Sci, Dept Met Engn, Salt Lake City, UT 84112 USA
[2] Newmt Min Corp, Plato Malozemoff Tech Facil, Englewood, CO 80112 USA
来源：
HYDROMETALLURGY | 2012年 / 113卷
关键词：
Thiocyanate; Oxidation; Sulfide minerals; Activation energy; Activated carbon;
D O I：
10.1016/j.hydromet.2011.11.009
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effects of metal ions, minerals, temperature, thiocyanate concentration, activated carbon, and pH on the rate of thiocyanate oxidation were determined. The rate of ferrous ion generation from the redox reaction between thiocyanate and ferric ion was found to be significant at 50 degrees C. The reaction constant (k) at 25 degrees C was found to be 1.43 x 10(-5) LOA mol(-0.4) m(-1). Ferric oxidation of thiocyanate was sensitive to temperature with an activation energy of 76.4 kJ/mol, typical of homogenous chemical reactions. Based on the kinetic data, the empirical rate equation for thiocyanate consumption and/or ferrous ion generation was found to have the following form: d[Fe2+]/dt = -8 d[SCN-]/dt = k[SCN-](1.36) [Fe3+](0) [H+](0) = k[SCN-](1.36) Oxide minerals did not have a profound effect on the oxidation of thiocyanate by ferric ion. Sulfide minerals, especially pyrite and galena catalyzed the redox reaction. The addition of cupric ion resulted in the oxidation of thiocyanate and formation of an insoluble cuprous thiocyanate compound. (C) 2011 Elsevier B.V All rights reserved.
引用
收藏
页码：19 / 24
页数：6
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