Kinetics and mechanism of MnO2 dissolution in H2SO4 in the presence of pyrite

被引：55

作者：

Nayak, BB ^{[1
]}

Mishra, KG ^{[1
]}

Paramguru, RK ^{[1
]}

机构：

[1] CSIR, Reg Res Lab, Bhubaneswar 751013, Orissa, India

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 1999年 / 29卷 / 02期

关键词：

cyclic redox reaction; dissolution; kinetics; manganese dioxide; mechanism; pyrite;

D O I：

10.1023/A:1003490810114

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

This paper describes a study of the kinetics and mechanism of MnO2 dissolution in H2SO4 in the presence of pyrite through leaching and electrochemical parameters. Manganese(IV) was found to dissolve mainly through reduction by the ferrous ion generated during oxidation of pyrite by the ferric ion. The oxidation which is slower and rate controlling may proceed through two different reactions, one producing SO and the other SO42-. Manganese dissolution runs at the same rate as that of pyrite oxidation by maintaining ferrous ion concentration at a much lower level than that of ferric. Kinetic equations based on corrosion coupling principles are developed to explain the observed leaching behaviour.

引用

页码：191 / 200

页数：10

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