Aeration pretreatment of low grade refractory gold ores

1990 ◽  
Vol 7 (1) ◽  
pp. 22-29 ◽  
Author(s):  
R. W. Bartlett
Keyword(s):  
Low Grade ◽  
Gold Ores ◽  
Refractory Gold Ores ◽  
Refractory Gold

scholarly journals The effect of iron and oxidizing flux addition on the fire assay of low grade pyritic refractory gold ores

2011 ◽  
Vol 47 (2) ◽  
pp. 219-227 ◽  
Author(s):  
A. Turan ◽  
O. Yucel
Keyword(s):  
Precious Metals ◽  
Low Grade ◽  
Fire Assay ◽  
Gold Ores ◽  
Refractory Gold Ores ◽  
Gold Silver ◽  
Refractory Gold ◽  
Pre Treatment ◽  
Comparison Of The Results ◽  
Additional Iron

In this study, experiments were conducted to understand the effects of different quantities of additional iron and oxidizing flux (Na2O2) on the direct fire assay of low grade pyritic refractory gold ores instead of performing any pre-treatment like roasting before fire assay. A portion of the pyritic ore was primarily roasted using a rotary kiln to remove sulphur content for the comparison of the results obtained from direct fire assay of the pyritic ore. Then, fire assay process was performed to the roasted ore and gold and silver content in the ore was determined. Unroasted ore specimens were fused by using fluxes and PbO, which accumulates the precious metals, with various quantities of iron. Correlation between the quantity of additional iron and the recovery of gold-silver were investigated. Various quantities of Na2O2, as an oxidizing flux, were added to the smelting charge with iron additions, from which the highest gold and silver recoveries were obtained from previous experiments. From the results, it was clear that the increase in additional iron and Na2O2 quantities was the reason for the increase in the recovered amounts of lead, gold and silver during the process.

Investigations of accelerating parameters for the biooxidation of low-grade refractory gold ores

2000 ◽  
Vol 13 (14-15) ◽  
pp. 1543-1553 ◽  
Author(s):  
T.L Deng ◽  
M.X Liao ◽  
M.H Wang ◽  
Y.-W Chen ◽  
N Belzile
Keyword(s):  
Low Grade ◽  
Gold Ores ◽  
Refractory Gold Ores ◽  
Refractory Gold

scholarly journals Refractory gold ores and concentrates part 1: mineralogical and physico-chemical characteristics

2019 ◽  
pp. 1-13 ◽  
Author(s):  
Richmond K. Asamoah ◽  
Massimiliano Zanin ◽  
Jason Gascooke ◽  
William Skinner ◽  
Jonas Addai-Mensah
Keyword(s):  
Chemical Characteristics ◽  
Gold Ores ◽  
Refractory Gold Ores ◽  
Physico Chemical ◽  
Refractory Gold

scholarly journals Analysis of the Microbial Community Associated with a Bioprocess System for Bioremediation of Thiocyanate- and Cyanide-Laden Mine Water Effluents

2015 ◽  
Vol 1130 ◽  
pp. 614-617 ◽  
Author(s):  
Robert J. Huddy ◽  
Rose Kantor ◽  
Wynand van Zyl ◽  
Robert P. van Hille ◽  
Jillian F. Banfield ◽  
...  
Keyword(s):  
Microbial Culture ◽  
Process Optimisation ◽  
Gold Extraction ◽  
Mixed Microbial Culture ◽  
Metabolic Potential ◽  
Gold Ores ◽  
Refractory Gold Ores ◽  
Refractory Gold ◽  
Key Microorganisms ◽  
Activated Sludge Processes

Gold extraction by cyanidation from refractory gold ores results in the formation of thiocyanate-and cyanide-contaminated wastewater effluents that must be treated before recycle or discard. Activated sludge processes, such as ASTERTM, can be used for biodegradation of these effluent streams. The destruction of these compounds is catalyzed by a mixed microbial culture, however, very little is known about the community composition and metabolic potential of the thiocyanate-and cyanide-degrading microorganisms within the community. Here we describe our on-going attempts to better understand the key microorganisms, within the ASTERTM bioprocess, that contribute to the destruction of thiocyanate and cyanide, and how this knowledge relates to further process optimisation.

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