Research on Acidic Oxidation Pretreatment of Arsenic and Sulfur-bearing Gold Concentrate at Tianmashan Mine，Tongling
Received date: 2014-12-26
Revised date: 2015-02-03
Online published: 2015-11-16
Gold cyanide leaching for a arsenic and sulfur-bearing gold concentrate at Tianmashan，Tongling，was difficult due to the fine disseminated grain sizes and large amounts of the gold mineral wrapped by sulfides.In order to improve the efficiency of cyanide leaching，some of tests regarding acidic oxidation pretreatment in the systems of HCl-H2O2-addictive were carried out under the conditions that the proportion of grinding fineness at -0.048 mm was 90%，pulp density at 40 g/L，stirring speed at 400 r/min，reaction temperature at 60 ℃，reaction time at 4 h，dosage of HCl at 0.7 mol/L，dosage of H2O2 at 0.5 mol/L and dosage of ethylene glycol at 9 mL/L.As a result，the dissolution rates of iron，arsenic and copper were 48.1%，99.3% and 89.76%，respectively.What’s more，the leaching rate of cyanide leached gold increased 33.6% than that of cyanide leached directly after oxidation pretreatment to gold concentrate.It was evident that the crystal structure of sulfide was destructed after oxidation pretreatment，meanwhile，the As，Cu and other ingredients were dissolved.Thus，the gold cyanide leaching rate increased.Finally，some guidance for other similar arsenic and sulfur-bearing refractory gold concentrate processing is provided，which is expected to be meaningful for applicability and development of the oxidation pretreatment with the HCl-H2O2-ethylene glycol.
MA Yingqiang , HUANG Falan , YIN Wanzhong , HONG Jongsu . Research on Acidic Oxidation Pretreatment of Arsenic and Sulfur-bearing Gold Concentrate at Tianmashan Mine，Tongling[J]. Gold Science and Technology, 2015 , 23(3) : 83 -88 . DOI: 10.11872/j.issn.1005-2518.2015.03.083
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