Pre-oxidation of high-sulfur and high-arsenic refractory gold concentrate by ozone and ferric ions in acidic media

2009 ◽  
Vol 97 (1-2) ◽  
pp. 61-66 ◽  
Author(s):  
Qingcui Li ◽  
Dengxin Li ◽  
Fangjun Qian
Keyword(s):  
Ferric Ions ◽  
Acidic Media ◽  
Refractory Gold ◽  
High Arsenic

scholarly journals Bio-oxidation of a refractory gold bearing high arsenic sulphide concentrate: A pilot study

1993 ◽  
Vol 11 (1-3) ◽  
pp. 243-252 ◽  
Author(s):  
J.T. Chapman ◽  
P.B. Marchant ◽  
R.W. Lawrence ◽  
R. Knopp
Keyword(s):  
Pilot Study ◽  
Refractory Gold ◽  
High Arsenic ◽  
Gold Bearing

Biooxidation of Carbonaceous Refractory Gold Ores by an Iron-Sulfur-Oxidizing Mixotrophic Bacterium at Neutral pH

2015 ◽  
Vol 1130 ◽  
pp. 440-444 ◽  
Author(s):  
R. Winarko ◽  
M. Zaki Mubarok ◽  
I.N. Rizki ◽  
Siti Khodijah Chaerun
Keyword(s):  
Extracellular Polymeric Substances ◽  
Extraction Yield ◽  
Ionic Form ◽  
Ferric Ions ◽  
Gold Extraction ◽  
Cyanide Ion ◽  
Solution Ph ◽  
Iron Sulfur ◽  
Refractory Gold ◽  
Sulfur Oxidizing

The ability of an iron-sulfur-oxidizing mixotrophic bacterium to treat two types of sulfide-rich carbonaceous refractory gold concentrates from Sulawesi and Sumatra in Indonesia was studied in comparison with an acidophilic chemolithotrophic bacterium Acidithiobacillus ferrooxidans. Over the course of the biooxidation experiments, the pH of the solution tended to rise (pH>5) due to the high content of acid-consuming minerals such as carbonates in both concentrates. Ferric ions were frequently observed to precipitate due to high solution pH. The BIOXskc employed in this study was able to increase the gold extraction from low sulfidic carbonaceous refractory gold concentrates by ~15% higher than that by using At. ferrooxidans. It was also capable of treating carbonaceous matters which causes preg-robbing effect and retaining iron in ionic form due presumably to the production of extracellular polymeric substances (EPS) under high solution pH. Nevertheless, BIOXskc also reduced the gold extraction yield of high sulfidic gold concentrates because of passivation effect. It is suggested that the precipitation of iron and sulfur on the surface of sulfide minerals during biooxidation may prevent cyanide ion contact with gold.

Study on the Gold Leaching Process by Potassium Ferricyanide

2015 ◽  
Vol 814 ◽  
pp. 273-277
Author(s):  
Ping Tang ◽  
Jing Liu ◽  
Min Wei Song ◽  
Hai Ping Yu ◽  
Xu Zhang
Keyword(s):  
Room Temperature ◽  
Potassium Ferricyanide ◽  
Process Conditions ◽  
Leaching Rate ◽  
Gold Leaching ◽  
Solid Ratio ◽  
Leaching Process ◽  
Refractory Gold ◽  
Object Of Study ◽  
High Arsenic

The traditional gold leaching method is cyanidation, which carries serious security and environmental problems. More and more attention is paid to the research on non-cyanide process. A high-arsenic-and-sulphur refractory gold concentrate in Sichuan was taken as the object of study. After the roasting-oxidation pretreatment of the sample, potassium ferricyanide was adopted to carry on the process experiment on gold-leaching. The leaching results as well as correlative process conditions were both investigated. The results showed that good leaching effects could be achieved by potassium ferricyanide. When the amount of potassium ferricyanide was 60g/L, the concentration of NaOH 0.2mol/L, the liquid-solid ratio 6:1 and the leaching process at room temperature lasted for 20h, the gold leaching rate reached 88.1%. If the leaching aid CaO2 is added simultaneously, it can contribute to the gold leaching. When the amount of CaO2 was 3g/L, the gold leaching rate increased to more than 94%, the amount of potassium ferricyanide decreased to 50g/L and the leaching time reduced to 14h.

Arsenic removal from high-arsenic water by enhanced coagulation with ferric ions and coarse calcite

2006 ◽  
Vol 40 (2) ◽  
pp. 364-372 ◽  
Author(s):  
S. Song ◽  
A. Lopez-Valdivieso ◽  
D.J. Hernandez-Campos ◽  
C. Peng ◽  
M.G. Monroy-Fernandez ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Ferric Ions ◽  
Enhanced Coagulation ◽  
High Arsenic

Bio-oxidation of a high-sulfur and high-arsenic refractory gold concentrate using a two-stage process

2018 ◽  
Vol 120 ◽  
pp. 94-101 ◽  
Author(s):  
Guohua Wang ◽  
Shuibo Xie ◽  
Xinxing Liu ◽  
Yonghong Wu ◽  
Yingjiu Liu ◽  
...  
Keyword(s):  
Two Stage ◽  
Refractory Gold ◽  
Stage Process ◽  
High Arsenic

Kinetics of high-sulphur and high-arsenic refractory gold concentrate oxidation by dilute nitric acid under mild conditions

2009 ◽  
Vol 22 (2) ◽  
pp. 111-115 ◽  
Author(s):  
Guolong Gao ◽  
Dengxin Li ◽  
Yong Zhou ◽  
Xianhao Sun ◽  
Wen Sun
Keyword(s):  
Nitric Acid ◽  
Mild Conditions ◽  
Refractory Gold ◽  
Kinetics Of ◽  
Dilute Nitric Acid ◽  
High Arsenic
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