Enzymatic Pre-Treatment of Carbonaceous Matter in Preg-Robbing Gold Ores: Effect of Ferrous Ion Additives

Kojo T. Konadu; Keiko Sasaki; Kwadwo Osseo-Asare; Takashi Kaneta

doi:10.4028/www.scientific.net/SSP.262.43

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Linking Microbial Community Dynamics in BIOX^® Leaching Tanks to Process Conditions: Integrating Lab and Commercial Experience
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HomeSolid State PhenomenaSolid State Phenomena Vol. 262Enzymatic Pre-Treatment of Carbonaceous Matter in...

Enzymatic Pre-Treatment of Carbonaceous Matter in Preg-Robbing Gold Ores: Effect of Ferrous Ion Additives

Abstract:

The bio-treatment of double refractory gold ores (DRGO) to reduce preg-robbing needs to account for the heterogeneity of the ore so as to acquire a much more complete picture of the system. To this end, the effects of ferrous ion additives on the degradation of powdered activated carbon (PAC) by cell-free spent medium (CFSM) was studied. Au(CN)₂^- adsorption and Raman spectrometric results suggest that the ferrous salt could have possibly reacted with some biogenic hydrogen peroxide to aid in the degradation of PAC. The bio-treatment produced mixed solid residues containing some partially degraded aromatic compounds which were soluble in alkaline solutions. Ultimately, biodegradation of PAC using CFSM in the presence of 50 µM FeSO₄.7H₂O for 7 days followed by washing with 3 mM NaOH reduced Au(CN)₂^- uptake by 80%.

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Solid State Phenomena (Volume 262)

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43-47

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https://doi.org/10.4028/www.scientific.net/SSP.262.43

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Online since:

August 2017

Authors:

Kojo T. Konadu, Keiko Sasaki, Kwadwo Osseo-Asare, Takashi Kaneta

Keywords:

Bio-Treatment, Carbonaceous Matter, Gold Ore

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