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Gold Science and Technology ›› 2013, Vol. 21 ›› Issue (5): 93-96.

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Research on Ammonia Leaching of Pingding Gold Ore in Pressure Oxidation Process

XIA Guangxiang,DUAN Dongping,ZHOU E,CHEN Siming,LI Ting   

  1. Institute of Process Engineering,Chinese Academy of Sciences,Beijing   100190,China
  • Received:2013-08-26 Revised:2013-09-19 Online:2013-10-28 Published:2014-04-02

Abstract:

Pingding gold ore,which containing high level of carbon,arsenic(orpiment and(or) realgar),is a refractory gold.Its gold extraction ratio is very low by common treatment process.The gold extraction ratio increases up to 92% after treating by pressure oxidation of ammonia leaching process,invented by authors.By adding sulfur, realgar could convert to orpiment in ammonia,and could dissolve in ammonia and be removal.At last,an insoluble sulfur film formatted by arsenic removal on gold ore particle oxidizes by Cu2+ catalyst.The costs of equipment and operation are significantly reduced than those of traditional pressure oxidation process because of its ammonia environment.Profitability could be achieved within two years.

Key words: arsenic refractory gold, pressure oxidation of ammonia leaching of gold, realgar conversion, Cu2+catalysis, Pingding gold ore, Gansu Province

CLC Number: 

  • TF831

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