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Gold Science and Technology ›› 2016, Vol. 24 ›› Issue (5): 115-120.doi: 10.11872/j.issn.1005-2518.2016.05.115

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XIAO Li 1，2，LV Cuicui 1，2，WANG Yongliang 1，2，YE Shufeng 1，2   

  1. 1.Institute of Process Engineering，Chinese Academy of Sciences，Beijing    100190，China；
    2.University of Chinese Academy of Sciences，Beijing    100049，China
  • Received:2016-06-28 Revised:2016-07-19 Online:2016-10-28 Published:2016-12-27

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Abstract:

The leaching of silver with the environmental effective sodium thiosulfate-potassium ferricyanide-sodium ferrocyanide alternative system has been studied.The thiosulfate leaching system was used to replace the widely-used cyanide.In this new thiosulfate leaching system，the more stable potassium ferricyanide was used to replace the traditional tetra-amine copper as oxidant.The effect of thiosulfate concentration，ratio of ferricyanide to ferrocyanide，pH，and temperature on silver leaching has been investigated.The results showed  that this leaching system was quietly efficient to the dissolution of silver，the silver leaching rate was extremely fast when the ferricyanide acted as oxidation in the initial stage.After the complete consumption of potassium ferricyanide，silver dissolution was driven by oxygen and leaching rate decreased.A high silver leaching rate could be achieved in the case of a slight excess of lixiviant.In the leaching of sulfuric acid residue，leaching conditions were 0.05 M Na2S2O3·5H2O，1 mM  K3Fe（CN）6，at pH=7，the extraction rate of gold and silver were 88% and 92%  respectively after a leaching time of 48 hours.

Key words: sodium thiosulfate, potassium ferricyanide, sulfuric acid residue, gold and silver leaching

CLC Number: 

  • TF831 

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