Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 32    No. 11    November 2022

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Galvanic effect of magnetite on electrochemical oxidation of arsenopyrite in acidic culture medium
Sha DENG1, Guo-hua GU2, Tao LONG1, Wei XIAO1, Wei YANG1

1. School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:The galvanic interaction of arsenopyrite-magnetite in acidic culture medium was investigated by electro- chemical measurements, X-ray photoelectron spectroscopy characterization and leaching experiments. The results indicated that the rest potential of magnetite was 321 mV, which was more anodic than 223 mV of arsenopyrite, and the galvanic current was 7.40 μA, verifying the existence of the galvanic interaction between arsenopyrite and magnetite. The galvanic potential and polarization curves suggested that the redox behaviors of arsenopyrite dominated the overall galvanic interaction. The galvanic interaction enhanced the electrochemical dissolution of arsenopyrite with the generation of more oxidation products (S0, SO32-, SO42- and AsO33-) on arsenopyrite and an increase in the chemical reactivity of the surface. Leaching experiments of 6 days showed that the presence of magnetite improved the arsenic release from arsenopyrite by 30 mg/L, and further confirmed the enhanced oxidation of arsenopyrite when coupled with magnetite.

 

Key words: arsenopyrite; magnetite; galvanic interaction; electrochemistry; surface properties; leaching

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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