Experimental Study on the Leaching of Gold from a Refractory Gold Concentrate by Chloride-hypochlorite Solution
Received date: 2014-04-26
Revised date: 2014-06-17
Online published: 2014-12-24
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.
LI Chao , LI Hongxu , YANG Xie , WANG Shuai . Experimental Study on the Leaching of Gold from a Refractory Gold Concentrate by Chloride-hypochlorite Solution[J]. Gold Science and Technology, 2014 , 22(4) : 108 -112 . DOI: 10.11872/j.issn.1005-2518.2014.04.108
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