Liberation of different pyrite types in refractory gold ores

2021 ◽  
Author(s):  
◽  
Ditend Tesh
Keyword(s):  
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.

scholarly journals Pretreatment Process on Refractory Gold Ores with As

2014 ◽  
Vol 54 (3) ◽  
pp. 543-547 ◽  
Author(s):  
Xin-yuan Nan ◽  
Xin Cai ◽  
Jun Kong
Keyword(s):  
Gold Ores ◽  
Refractory Gold Ores ◽  
Refractory Gold

Bio-Modification of Carbonaceous Matters in Gold Ore: Model Experiments Using Powdered Activated Charcoal and Cell-Free Extracts of Phanerochaete chrysosporium

2015 ◽  
Vol 1130 ◽  
pp. 109-113
Author(s):  
Kojo Twum Konadu ◽  
Keiko Sasaki ◽  
Grace Ofori-Sarpong ◽  
Kwadwo Osseo-Asare ◽  
Takashi Kaneta
Keyword(s):  
Bond Cleavage ◽  
High Ratio ◽  
Carbonaceous Matter ◽  
Gold Ores ◽  
Aliphatic Compounds ◽  
Model Experiments ◽  
Refractory Gold Ores ◽  
Refractory Gold ◽  
Work Model ◽  
C Nmr

The detailed mechanism behind the bio-decomposition of carbonaceous matter in refractroy goold ore byPhanerocheate chrysosporiumto facilitate improved cyanidation of gold is as yet undersdtood. To gain a better understanding of this mechanism, the present work model experiments using powdery activated carbon (PAC) and cell-free extracts ofP.chrysosporiumto simulate and focus on the biotransformation of carbonaceous matters in refractory gold ores. The results of solid characterization using SEM and XRD indicated a more non-uniform surface and smaller crystal sizes for PAC treaded with cell-free extracts for 72 hours. The significant decomposition of aromatic compounds into aliphatic compounds were observed in13C-NMR and FTIR results for the high ratio of cell-free extract volume to mass of PAC. This results support the theory that one of the fundamental mechanisms behind the bio-decomposition process is aromatic bond cleavage by biomolecules produced byP.chrysosporium.

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