Electrode process kinetics of oxidation behavior difference between pyrite and arsenopyrite

被引：1

作者：

Li X. ^{[1
,2
]}

Jiao F. ^{[1
,2
]}

Qin W. ^{[1
,2
]}

Cui Y. ^{[1
,2
]}

Li J. ^{[1
,2
]}

机构：

[1] School of Minerals Processing& Bioengineering, Central South University, Changsha

[2] Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 08期

关键词：

arsenopyrite; electrode process; kinetic; pyrite;

D O I：

10.11817/j.issn.1672-7207.2023.08.001

中图分类号：

学科分类号：

摘要：

The oxidation process of pyrite and arsenopyrite at the electrode was studied by means of potentiodynamic scanning, cyclic voltammetry and potentiostatic step method to enhance the flotation separation of arsenopyrite and pyrite. The different of kinetic behavior between pyrite and arsenopyrite was analyazed. The results show that when pH=11, hydrophilic substances such as Fe(OH)3 and SO24- are formed in the surface oxidation products of arsenopyrite and pyrite. The initial oxidation potential of pyrite is higher than that of arsenopyrite, but the current density of the corresponding oxidation peak is lower than that of arsenopyrite, which shows that arsenopyrite is easier to oxidize than pyrite, and the surface of arsenopyrite can form hydrophilic surface more quickly and easily. The corrosion potential of arsenopyrite is lower than that of pyrite under the condition of pH.At pH 4, 6.86, 9.18 and 11, and the oxidation rates of arsenopyrite are 0.83, 1.40, 2.57, and 1.52 times of pyrite, respectively. When pH=11, the oxidation kinetic equation of pyrite is η=0.248 logit→0+1.346, i0=3.8 μA/cm2, the oxidation kinetic equation of arsenopyrite is η=0.291 logit→0+1.515, i0=6.18 μA/cm2, which is consistent with the results of Tafel. © 2023 Central South University of Technology. All rights reserved.

引用

页码：2965 / 2972

页数：7

共 22 条

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