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Gold Science and Technology ›› 2014, Vol. 22 ›› Issue (2): 77-82.doi: 10.3969/j.issn.1005-2518.2014.02.077

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Analysis of Potential-pH Diagrams for Refractory Gold Concentrate Bio-leaching Systems

LI Chao1，2，ZHANG Zhiqian1，LI Hongxu1，2   

  1. 1.School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China
    2.Beijing Key Laboratory of Green Recovery and Extraction of  Precious Metals，Beijing    100083，China
  • Received:2013-12-17 Revised:2014-02-24 Online:2014-04-28 Published:2014-08-26

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Abstract:

Potential-pH（Eh-pH） diagram is an important means for thermodynamic analysis，it can reflect the various thermodynamic equilibriums in directly ways and help to determine the trends of chemical reactions.So the Eh-pH diagram plays an important guiding role in biological leaching refractory gold concentrate.In this article，the Eh-pH diagrams of FeS2-H2O，FeAsS-H2O system under the condition of 313 K，pH=0~7.0，E=-1.2~1.2 V were drawn by thermodynamic calculation and analyzed briefly.Results indicated that the stability zone of pyrite and arsenopyrite was respectively under potential of 0.336 V and 0.133 V in acidic solution，which means that arsenopyrite would be oxidized and dissolved at low potential.

Key words: Eh-pH diagrams, refractory gold concentrate, bio-leaching, thermodynamic analysis

CLC Number: 

  • TF18

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