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Gold Science and Technology ›› 2016, Vol. 24 ›› Issue (1): 108-112.doi: 10.11872/j.issn.1005-2518.2016.01.108

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Recovery of Gold and Silver from Pressure Oxidative Slag of Refractory Gold Ore

DING Wentao，CAI Chuangkai，GUO Jinyi，XU Xiaoyang   

  1. Xiamen Zijin Mining & Metallurgy Technology Co.，Ltd.，Xiamen   361101，Fujian，China
  • Received:2015-11-06 Revised:2015-12-14 Online:2016-02-29 Published:2016-04-05

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Abstract:

After acidic pressure oxidation of refractory gold ore containing copper，copper were basically leached into the solution and eliminated the influence  on cyanide process，while silver in the pressure oxidation process could combine with jarosite to generate [AgFe3（SO4）2（OH）6].The gold and silver recovery rate reached respectively over 99% and less than 10% in conventional cyanide process.This paper investigated the effect of pulp density，dosage of sodium cyanide and lime，pretreatment temperature and time，cyanide time and carbon density to leaching rate for gold and silver，finally the optimum leaching condition was determined.The silver recovery was improved substantially after silver pretreatment on the condition of 85~90 ℃，pulp concentration of  40% and lime dosage of  40 kg/t which achieved about 85%，meanwhile，the gold leaching rate also remain above 99%.

Key words: refractory gold ore, pressure oxidation, pretreatment, rate of recovery

CLC Number: 

  • TF831

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