Reduction and Sulfur-fixing Roasting and Combination of Beneficiation and Metallurgy for Extraction of Gold-stibnite Concentrate

Zhen OUYANG; Yifeng CHEN; Yujie HU; Chaobo TANG; Yongming CHEN; Longgang YE

doi:10.11872/j.issn.1005-2518.2019.03.449

2019 , Vol. 27 >Issue 3: 449 - 457

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.03.449

Mining Technology and Mine Management

Reduction and Sulfur-fixing Roasting and Combination of Beneficiation and Metallurgy for Extraction of Gold-stibnite Concentrate

Zhen OUYANG ^,¹ ,
Yifeng CHEN ¹ ,
Yujie HU ¹ ,
Chaobo TANG ² ,
Yongming CHEN ² ,
Longgang YE ^,¹

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1. School of Metallurgical and Material Engineering，Hunan University of Technology，Zhuzhou 412007，Hunan，China
2. School of Metallurgy and Environment，Central South University，Changsha 410083，Hunan，China

Received date: 2018-07-11

Revised date: 2018-11-12

Online published: 2019-07-09

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Highlights

Antimony-bearing gold ore is a kind of refractory gold deposit.Because gold is generally shown in microscopic particles wrapped in antimony，iron and arsenic sulfide，the general gold leaching method is not very effective in dealing with this mine.In views of the extraction difficulty of antimony-bearing gold ore，a new process based on the reduction and sulfur-fixing roasting and combination of beneficiation and metallurgy was proposed.Using ZnO and carbon as sulfur fixing agent and reductant，antimony sulfide is transformed to metal Sb and ZnS，and the gold is gathered in the former.Then the mixture is separated by mineral separation method.Gold enter the crude antimony powder following antimony.Crude antimony powder has been refined to obtain fine antimony powder，while zinc sulfide concentrate can be directly used in the smelting of zinc to produce metal zinc.The mechanism of the roasting process were investigated in detail，and the results show that overall reaction contained two steps.When the temperature is below 800 ℃，the main reaction are performed between Sb₂S₃ and ZnO to yield Sb₂O₃.Less antimony oxide is reduced and no more metal antimony is obtained.When the temperature is higher than 800 ℃，a large amount of the Sb₂O₃ is reduced to metallic antimony.The particle of antimony and zinc sulfide distributed respective without parcel.Both sulfur-fixing and reducing reactions are engaged completely，and with the increase of temperature，the sulfur-fixing rate and the production rate of metal antimony increased.The sulfur-fixing rate of ZnO and generation rate of antimony reached 98.96% and 92.99% respectively at 1 000 ℃.In a gravity separation and flotation test of the roasting product of Sb-bearing gold concentrate，Sb could be extracted with a direct recovery rate of 90.57%，while the grade of cured antimony and content of gold were 92.06% and 134×10^-6，meanwhile，the sulfur-fixing rate reached 94.35%.So the new process is feasibility with the advantages of low temperature and low carbon，cleaning and environmental process.

Cite this article

Zhen OUYANG , Yifeng CHEN , Yujie HU , Chaobo TANG , Yongming CHEN , Longgang YE . Reduction and Sulfur-fixing Roasting and Combination of Beneficiation and Metallurgy for Extraction of Gold-stibnite Concentrate[J]. Gold Science and Technology, 2019 , 27(3) : 449 -457 . DOI: 10.11872/j.issn.1005-2518.2019.03.449

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