Novel two-step process to improve efficiency of bio-oxidation of Axi high-sulfur refractory gold concentrates

In order to improve the bio-oxidation efficiency of Axi refractory gold concentrate, a two-step process including a high temperature chemical oxidation and a subsequent bio-oxidation, combined with pH control during the bio-oxidation step was used. The results revealed that the optimum mode was to m...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2015-12, Vol.25 (12), p.4119-4125
Main Authors: LIU, Xin-xing, WANG, Guo-hua, HUO, Qiang, XIE, Jian-ping, LI, Shou-peng, WU, Hai-yan, GUO, Yu-jie
Format: Article
Language:English
Subjects:
bio-oxidation
Concentrates
Culture
Dealing
Gold
gold concentrate
Optimization
Oxidation
pH control
Refractories
two-step oxidation
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Summary:In order to improve the bio-oxidation efficiency of Axi refractory gold concentrate, a two-step process including a high temperature chemical oxidation and a subsequent bio-oxidation, combined with pH control during the bio-oxidation step was used. The results revealed that the optimum mode was to maintain solution pH at 1.0-1.2 during the biological oxidation stage. Under this condition, the activity of mixed culture could be sustained and the formation of jarosite could be diminished, thus the oxidation efficiency was improved. The oxidation levels of iron and sulfur were improved by 12.50% and 15.49%, and the gold recovery was increased by 21.02%. Therefore, the two-step process combined with pH control is an effective method for oxidizing the biohydrometallurgical process of Axi gold concentrate, and it will have a broad prospect of application in dealing with complex refractory gold concentrate.
ISSN:1003-6326
DOI:10.1016/S1003-6326(15)64063-8