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Gold Science and Technology ›› 2014, Vol. 22 ›› Issue (4): 72-77.doi: 10.11872/j.issn.1005-2518.2014.04.072

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Study on Surface Reaction Mechanism of Pyrite in Alkaline Environment

XU Tao1,2,ZHONG Shuiping1,2,YIN Zhigang3   

  1. 1.Zijin Mining Group Co.,Ltd.,Shanghang   364200,Fujian,China;
    2.State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Shanghang   364200,Fujian,China;
    3.Chengdu Departmental Comprehensive Rock Ore Testing Center,Sichuan Provincial Bureau of Geology and Mineral Resources,Chengdu   610000,Sichuan,China
  • Received:2013-05-16 Revised:2014-06-27 Online:2014-08-28 Published:2014-12-24

Abstract:

The surface mechanism of pyrite in alkaline environment was investigated by SEM,XPS and frontier orbital theory calculation.The results reveal that S,Fe,Cu atoms of pyrite crystal structure shifted into the surface and were oxidized to sulfate,hydroxide and sulphur.The oxidation products on the surface of pyrite increased with processing time.Pyrite surface was totally oxidized after 4 hours.Cu substitution in pyrite crystal structure changed receiving and losing electron between Fe and S atoms in HOMO orbital.As a result,the oxidation of Fe and S atoms are more easily than Cu atom.That may explain the experimental phenomenon that iron and sulfur compounds first appeared and then copper oxidation products are discovered on the pyrite surface.

Key words: pyrite, surface reaction mechanism, XPS, frontier orbital theory, refractory gold ores

CLC Number: 

  • TD951

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