Experimental Study on Bacterial Oxidation-Gold Extraction of Paodaoling Refractory Gold Concentrate
Received date: 2017-07-11
Revised date: 2017-08-22
Online published: 2018-05-19
Paodaoling gold mine is a typical arsenic-bearing refractory gold deposit，for its gold concentrate，combined with ore properties，the effect of biooxidation pretreatment was investigated.The experiment results showed that this kind of gold ore contains 20.30 g/t gold，3.39% arsenic，29.8% sulfur and 4.10% iron，and a 30% leaching rate of the gold concentrate can be obtained by direct cyanidation.The main metallic minerals in the gold ore are pyrite，arsenopyrite and realgar.The gangue minerals include feldspar，calcite，quartz，sericite and so on，and it belongs to the refractory gold ore.After 8 days of biooxidation process by HQ0211 bactreium，the arsenic removal rate was 46.25%.The oxidation residue contains 32.1 g/t gold and the weightloss rate was 42.53%.The gold cyanidation process of oxidation residue was conducted under ventilation conditions.The sodium cyanide was 0.1% and pH was 10.5~11.After cyaniding for 48 hours，the weight of gold ore was reduced from 300 g to 290 g，and the residue yield was 96.67%.According to the analysis results of cyanidation residue，the gold content reduced from 32.1 g/t to 2.7 g/t and the gold leaching rate was 91.59%，which was greatly improved.The consumption of sodium cyanide in cyanidation process was 13.53 kg/t.The gold cyanidation effect of Paodaoling gold mine was remarkable after pretreatment by HQ0211 bacterium，it provide reliable data for treatment process of this gold ore and provide reference for effective utilization of this kind of mineral.
LI Jiafeng , YANG Hongying , TONG Linlin , JIN Zhenan , ZHANG Dengchao . Experimental Study on Bacterial Oxidation-Gold Extraction of Paodaoling Refractory Gold Concentrate[J]. Gold Science and Technology, 2018 , 26(2) : 248 -253 . DOI: 10.11872/j.issn.1005-2518.2018.02.248
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