carbonaceous matter in gold ore processing



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Fungal-transformation of surrogate sulphides and ,
Fungal-transformation of surrogate sulphides and ,

Abstract In the recovery of gold from refractory gold ores, pretreatment is required to decompose sulphides and liberate occluded gold before cyanidation, and to deactivate carbonaceous matter and prevent it from adsorbing dissolved gold

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Research status of carbonaceous matter in carbonaceous ,
Research status of carbonaceous matter in carbonaceous ,

deleterious effects on gold extraction: the carbonaceous matter can lock up gold to inhibit leaching; the carbonaceous matter can absorb dissolved gold from precious solution [19,20] The elemental carbon has been discovered in almost all carbonaceous gold ores, which are the natural activated carbon between anthracite and graphite [8,21]

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PREG-ROBBING CARBONACEOUS MATTER: AN EVALUATION ,
PREG-ROBBING CARBONACEOUS MATTER: AN EVALUATION ,

Gold losses related to carbonaceous matter (CM) during processing are a significant problem in the gold processing industry Inherent CM in gold ores can behave similarly to activated carbon in its ability to adsorb gold cyanide This phenomenon is termed preg-robbing as the surface adsorbed gold cannot, for the most part, be recovered

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Carbonaceous ore body - studentsrepoumedumy
Carbonaceous ore body - studentsrepoumedumy

44 Carbonaceous matter and the genesis of gold mineralization , Plant processing can be affected by carbon level in the ore feed to the plant and process recovery can drop significantly as a result of preg-robbing activity At 05% carbon content in an ore, plant process recovery with a chemical reagent is around 90% .

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Treatment of carbonaceous refractory gold ores
Treatment of carbonaceous refractory gold ores

Refractory carbonaceous gold ores pose challenges during cyanidation of gold due to the presence of carbonaceous matter (CM) which preg-robs dissolved gold, and this results in a decreased recovery

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Double-Refractory Carbonaceous Sulfidic Gold Ores ,
Double-Refractory Carbonaceous Sulfidic Gold Ores ,

The presence of carbonaceous matter in the ore has also been identified as a cause for the refractory behavior of some gold or Like activated carbon, the carbonaceous matter can adsorb the gold cyanide complex, thus reducing the recovery of gold in a cyanide-based process

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SIMULTANEOUS BIOTRANSFORMATION OF ,
SIMULTANEOUS BIOTRANSFORMATION OF ,

SIMULTANEOUS BIOTRANSFORMATION OF CARBONACEOUS MATTER AND SULFIDES IN DOUBLE REFRACTORY GOLD ORES USING THE FUNGUS, PHANEROCHAETE CHRYSOSPORIUM A Dissertation in Energy and Mineral Engineering by Grace Ofori-Sarpong 2010 Grace Ofori-Sarpong Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy August 2010

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Enzymatic Pre-Treatment of Carbonaceous Matter in Preg ,
Enzymatic Pre-Treatment of Carbonaceous Matter in Preg ,

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 .

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Assessing the Parameters for Optimum Biotransformation of ,
Assessing the Parameters for Optimum Biotransformation of ,

Refractory carbonaceous gold ores pose challenges during cyanidation of gold due to the presence of carbonaceous matter (CM) which preg-robs dissolved gold, and this results in a decreased recovery In an on-going study, the fungus, Phanerochaete chrysosporium has been used to deactivate CM and decrease its ability to preg-rob aurocyanide

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Ammoniacal thiosulfate and sodium cyanide leaching of preg ,
Ammoniacal thiosulfate and sodium cyanide leaching of preg ,

carbonaceous matter by examining gold-cyanide complex recovery during leaching of the carbona-ceous matter with sodium cyanide and ammoniacal thiosulfate Although autoclaving is used during ore processing, Stenebraten et al 8 only examined˚ wx carbonaceous matter from non-autoclaved ore; thus, carbonaceous matters from autoclaved and non-auto-

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Bioleaching Carbonaceous Gold Ores - 911metallurgist
Bioleaching Carbonaceous Gold Ores - 911metallurgist

The previous tests demonstrated the use of facultative and extreme thermophiles for refractory sulfide gold ores and flotation concentrat The following tests were conducted on carbonaceous gold ores to evaluate response to bioleaching Facultative Thermophile Bioleaching of Carbonaceous Gold Ore The facultative thermophile S1I was used to pretreat a carbonaceous gold ore under CSTR conditions

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STUDY ON SURFACTANTS FOR PASSIVATION OF NATURALLY ,
STUDY ON SURFACTANTS FOR PASSIVATION OF NATURALLY ,

chemical compounds can passivate the carbonaceous matter by selective adsorption or wetting of its surface Treatments of carbonaceous ores with chemical surfactants (blanking reagents) have shown promising results but at the same time have demonstrated that, if not properly used, could have a strong detrimental effect on the gold recovery process

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An investigation of the carbonaceous component of preg ,
An investigation of the carbonaceous component of preg ,

AN INVESTIGATION OF THE CARBONACEOUS COMPONENT OF PREG-ROBBING GOLD ORES 139 Introduction For many years carbonaceous gold ores have been identified as having the ability to adsorb gold (I) cyanide from leach solutions1-14 This phenomenon, known as preg-robbing, is responsible for poor recoveries as the

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US4919715A - Treating refractory gold ores via oxygen ,
US4919715A - Treating refractory gold ores via oxygen ,

Gold-containing ores, having refractory sulfidic matter or a combination of refractory sulfidic matter and refractory carbonaceous matter, are processed to recover their gold valu The process uses an ore roasting procedure that utilizes a two-state, fluidized bed roaster The process also employs a pure oxygen atmosphere during roasting

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Carbonaceous Gold Ores Treatment Process - Hydrometallurgy ,
Carbonaceous Gold Ores Treatment Process - Hydrometallurgy ,

It is good with fine gold in sulphid Pyrite may not need to oxidize completely in this process It works well with telluride gold ores such as at Certej in Romania General mineralogy affects the process choice (sulfide content, carbonate content and composition, organic matter and so forth) as well as economics, infrastructure, climate .

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Adsorption of aurocyanide complexes onto carbonaceous ,
Adsorption of aurocyanide complexes onto carbonaceous ,

uptake capacity of Goldstrike ore carbonaceous matter and the preg-robbing behavior of the parent ore The effect of varying contact time between the aqueous gold–cyanide and the carbonaceous matter on the uptake of aurocyanide complexes was , solutions during the processing of carbonaceous or

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The behaviour of carbonaceous matter in cyanide leaching ,
The behaviour of carbonaceous matter in cyanide leaching ,

Carbonaceous gold ore is a kind of refractory gold ore resource, the processing of which is impacted by "preg-robbing" behavior and the inhibition of Au dissolution by carbonaceous matter [4,[8][9 .

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Treatment of carbonaceous refractory gold ores - ScienceDirect
Treatment of carbonaceous refractory gold ores - ScienceDirect

Minerals Engineering, Vol 4, Nos 7-11, pp 1043-1055, 1991 0892-6875/91 $300 + 000 Printed in Great Britain 1991 Pergamon Press plc TREATMENT OF CARBONACEOUS REFRACTORY GOLD ORES PM AFENYA Dept of Mining Engineering, UniversityofTechnology, Lae, Papua New Guinea ABSTRACT Gold ores can be categorized into two types - free milling and refractory

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