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Gold Science and Technology ›› 2014, Vol. 22 ›› Issue (4): 108-112.doi: 10.11872/j.issn.1005-2518.2014.04.108

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Experimental Study on the Leaching of Gold from a Refractory Gold Concentrate by Chloride-hypochlorite Solution

LI Chao1，2，LI Hongxu1，2 ，YANG Xie1，2，WANG Shuai1，2   

  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:2014-04-26 Revised:2014-06-17 Online:2014-08-28 Published:2014-12-24

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Abstract:

In this research，sodium hypochlorite solution was used for leaching gold from a refractory gold concentrate.The influence of NaCl and NaClO concentration，and reaction time to the leaching rate were investigated in this experiment.The raw materials and the leaching residue were characterized by a series of analysis methods such as XRD，XRF，SEM and EDS，and the reaction mechanism are analyzed in this paper.Results indicate that the leaching rate and the desulfurization rate can be achieved 96.26% and 98% respectively at most optimum conditions as follows：NaCl concentration 50 g/L，NaClO concentration 200 g/L，liquid-solid ratio 10∶1，the best reaction time was 150 mins，and these conditions should be guaranteed pH<8.0，Eh>900 mV.Experimental results show that the method of chloride-hypochlorite leaching has the advantages of short process，low pollution and higher in reaction rate compared with the traditional cyanidation method.

Key words: non-cyanide reagent, refractory gold concentrate, chloride-hypochlorite solution, leaching

CLC Number: 

  • TF831

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