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Gold Science and Technology ›› 2012, Vol. 20 ›› Issue (6): 58-61.

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Experimental Study on Raising the Cyanide Leaching Efficiency of Gold by Acid Leaching

HE Ye1，BAI Pengcheng1，HUANG Guanyin1，ZHANG Xianjun1，CHEN Fangfang2，SUN Meifen2   

  1. 1.Hunan Central South Gold Smelting Co.，Ltd.，Pingjiang   414507，Hunan，China；
    2.Key Laboratory Green Process and Engineering，National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology，Institute of Process and Engineering，Chinese Academy of Sciences，Beijing   100190，China
  • Received:2012-08-23 Revised:2012-11-04 Online:2012-12-28 Published:2013-06-21

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543

Abstract:

For high arsenic containing gold ore，two stage roasting technology for pretreatment in the research and production practice are usually used to obtain higher leaching rate of gold by removing arsenic and sulphur.The key technical problem should be resolved urgently in the research and production is how to adopt low-cost pretreatment method to further reducing the rate of gold in tailing.The research on raising the cyanide leaching efficiency of gold by acid leaching was carried out on the basis of chemical analysis，mineral composition analysis and the gold occurrence state analysis of the second segment calcine.The effects of experimental conditions，such as the grinding size， the volume of concentrated sulfuric acid，leaching temperature and leaching time were investigated.After being milled for 1 hour，the second segment calcine was leached at 95 ℃ for 2.5 hours by using concentrated sulfuric acid dosage 2 tons per ton（to second segment calcine），and the cyanide leaching efficiency 97.86% of gold was achieved.

Key words: Acid leaching, Cyaniding, Leaching efficiency, Refractory gold ore

CLC Number: 

  • TF83/TD953

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