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Pyrite oxidation mechanism in aqueous medium
Author(s) -
Feng Jiling,
Tian Hua,
Huang Yaling,
Ding Zhiying,
Yin Zhoulan
Publication year - 2019
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201800368
Subject(s) - pyrite , chemistry , dissolution , sulfide , ferrous , aqueous solution , x ray photoelectron spectroscopy , redox , electrochemistry , inorganic chemistry , fourier transform infrared spectroscopy , sulfate , raman spectroscopy , mineral , iron sulfide , sulfur , chemical engineering , mineralogy , electrode , organic chemistry , physics , optics , engineering
The mineral pyrite is considered the most common form of the sulfide minerals. Its oxidation is a very important process in nature, which involves in the redox recycling of iron. However, because of the growing need for the industrial production, sulfide oxidation produces more and more acid mine (or rock) drainage. This acid drainage has become a heavy economic and environmental problem. This review describes the oxidation mechanism of pyrite in an aqueous medium, including general oxidation and microbial oxidation, where sulfate, ferrous ion, S 0 , polysulfides, iron[III], and some intermediate species are formed. Also included is recent evidence on the electrochemical oxidation determined using the electrochemical method, X‐ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and other techniques. In addition, the factors that influence the oxidation and dissolution rate, and the descriptive approaches for different species are discussed.