Leaching of pyrite with hydrogen peroxide in sulphuric acid

被引：122

作者：

Antonijevic, MM

Dimitrijevic, M

Jankovic, Z

机构：

来源：

HYDROMETALLURGY | 1997年 / 46卷 / 1-2期

关键词：

D O I：

10.1016/S0304-386X(96)00096-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The kinetics of leaching pyrite with hydrogen peroxide in sulphuric acid were investigated. The parameters studied were: stirring speed, temperature, particle size and concentrations of H2O2 and H2SO4. The effects of SO42- and H+ additions were also investigated. The leaching race decreases with increasing stirring speed and H2SO4 concentration. The kinetics of pyrite dissolution are described by means of the surface reaction control shrinking core model. This is supported by an activation energy of 68 kJ/mol and a linear relationship between the rate constant and the inverse of the particle radius. The consumption of H2O2 is greater than that stoichiometrically required, due to its catalytic decomposition. The leaching rate is first order with respect to H2O2. Additions of SO42- have a negative influence on the leaching rate, whereas H+ additions have a beneficial effect. A reaction mechanism is proposed.

引用

页码：71 / 83

页数：13

共 21 条

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