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Bio-Oxidation and Biocyanidation of Refractory Mineral

In addition, the role of the microbial community in the bio-oxidation of refractory ores for removal of base metal impurities and in the recovery of Au based on biocyanidation is

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oxidation of refractory minerals in angola

2021-10-13  pyrite mineral oxidation. Pressure oxidation of pyrite-arsenopyrite refractory gold concentrate177 Кб Minerals recognized from the concentrate with XRD were pyrite 24.7%, arsenopyrite 27.1%, quartz 10.7LONG, H., DIXON, D.G., 2004, Pressure oxidation of pyrite in

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PRESSURE OXIDATION OF REFRACTORY GOLD ORES:

2014-10-1  The refractory nature of the concentrate requires a pressure oxidation (POX) step to oxidise the sulfide minerals and unlock the value metals. The oxidation of sulfides is a highly exothermic reaction. The energy generated by the reaction of the sulfide minerals is such that the autoclave temperature can exceed the 210 230°C operating

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OXIDATION OF REFRACTORY GOLD CONCENTRATES

2013-7-9  oxidation of arsenopyrite with air or oxygen has shown that the initial rate of arsenopyrite oxidation is proportional to the concentration of dissolved oxygen. A reaction mechanism for the oxidation of arsenopyrite has been proposed, which involves an anodic oxidation of the mineral involving hydroxyl ions coupled to a cathodic process

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Bio-Oxidation and Biocyanidation of Refractory Mineral

2014-10-6  (2015). Bio-Oxidation and Biocyanidation of Refractory Mineral Ores for Gold Extraction: A Review. Critical Reviews in Environmental Science and Technology: Vol. 45, No. 15, pp. 1611-1643.

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Leachox Refractory Process Maelgwyn Mineral Services

2019-5-14  Oxidation . ABSTRACT . The Leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale. In this paper the successful implementation of the process, from initial testing through to commissioning at one of the world’s largest refractory gold mines is described.

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Laboratory-scale continuous bio-oxidation of a gold

2002-5-1  The sulphide coating of most refractory ores contain mineral species such as pyrite (FeS 2) and arsenopyrite (FeAsS), but very few contain enargite (Cu 3 AsS 4) as some Chilean minerals do. Because this is an uncommon sulphide, information on its behaviour under bio-oxidation conditions is scarcely found in the literature.

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Sun High Pressure Oxidation Of Refractory Gold Minerals

Ore Gold Oxidation Lijmbeekstraat. Pressure oxidation was developed for processing refractory ores where gold is occluded in the sulfide minerals typically pyrite or arsenopyrite Oxidation of the sulfides at elevated temperatures and pressures liberates the gold allowing it to be economically recovered by conventional circuits. Learn More.

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Developments in the pretreatment of refractory gold

2009-11-20  processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid. These processes include the high-pressure and the atmospheric-pressure oxidation methods. High-pressure oxidation processes are difficult to carry out, because they require high-capital cost autoclaves.

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Refractory Gold Ore Treatment Methods

2016-7-14  Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and certain other minerals

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PRESSURE OXIDATION OF REFRACTORY GOLD ORES:

2014-10-1  The refractory nature of the concentrate requires a pressure oxidation (POX) step to oxidise the sulfide minerals and unlock the value metals. The oxidation of sulfides is a highly exothermic reaction. The energy generated by the reaction of the sulfide minerals is such that the autoclave temperature can exceed the 210 230°C operating

get price

OXIDATION OF REFRACTORY GOLD CONCENTRATES

2010-12-21  The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures and pressures without the addition of cyanide has been studied.

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oxidation of refractory minerals in angola

2021-10-13  pyrite mineral oxidation. Pressure oxidation of pyrite-arsenopyrite refractory gold concentrate177 Кб Minerals recognized from the concentrate with XRD were pyrite 24.7%, arsenopyrite 27.1%, quartz 10.7LONG, H., DIXON, D.G., 2004, Pressure oxidation of pyrite in

get price

Oxidation of refractory gold concentrates and

The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures and pressures without the addition of cyanide has been studied. It involves the following aspects: the chemistry of the oxidation of pure arsenopyrite and pyrite minerals in aerated alkaline solutions; the kinetics of

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Effect of Initial Cell Concentration on Bio-Oxidation of

2021-7-31  Bio-oxidation of refractory sulfidic gold minerals has been applied at the commercial scale as a pre-treatment to improve gold yields and reduce chemical consumption during gold cyanidation.

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Leachox Refractory Process Maelgwyn Mineral Services

2019-5-14  Oxidation . ABSTRACT . The Leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale. In this paper the successful implementation of the process, from initial testing through to commissioning at one of the world’s largest refractory gold mines is described.

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Gold recovery from refractory gold concentrates by

2019-3-1  Gold recovery from refractory gold concentrates by pressure oxidation pre-treatment and thiosulfate leaching Li Yu 1, Shimei Li 1, Quanjun Liu 1*, Jiushuai Deng 2,1*, Bin Luo 1, Yuanqin Liang 1, Liuchuang acid generatione from the oxidation reaction of

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Supergene Oxidation of Copper Deposits: Zoning and

2011-5-30  Pyrite is a relatively refractory mineral in the replacement sequence; marcasite oxidizes more quickly than pyrite (Mason and Berry, 1968), and pyrrhotite oxidation is as much as two orders of magnitude faster than oxidation of pyrite (Nicholson and Scharer, 1994). Laboratory observations of Fe sulfide oxidation are corroborated by the para-

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Basic Iron Sulphate in Pressure Oxidation Processing

refractory gold sulphide hosts are arsenopyrite and pyrite, and in order to achieve acceptable gold recoveries, it is generally necessary to break down the host mineral chemically. This is done by roasting, bacterial oxidation or pressure oxidation . processes, in which the sulphide component of the host mineral is oxidized with oxygen to elemental

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Improving Gold Recovery from Refractory Gold Ores

The use of acidic and neutral SOB together by performing oxidation in a 2-stage process utilizing acidophilic and neutrophilic bacteria consecutively has led to increased oxidation for refractory

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Bio-Oxidation and Biocyanidation of Refractory Mineral

In addition, the role of the microbial community in the bio-oxidation of refractory ores for removal of base metal impurities and in the recovery of Au based on biocyanidation is reviewed. They

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Bio-Oxidation and Biocyanidation of Refractory Mineral

2014-10-6  (2015). Bio-Oxidation and Biocyanidation of Refractory Mineral Ores for Gold Extraction: A Review. Critical Reviews in Environmental Science and Technology: Vol. 45, No. 15, pp. 1611-1643.

get price

OXIDATION OF REFRACTORY GOLD CONCENTRATES

2010-12-21  oxidation of arsenopyrite with air or oxygen has shown that the initial rate of arsenopyrite oxidation is proportional to the concentration of dissolved oxygen. A reaction mechanism for the oxidation of arsenopyrite has been proposed, which involves an anodic oxidation of the mineral involving hydroxyl ions coupled to a cathodic process

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Oxidation of a refractory gold concentrate using pressure

The gold group at SGS Minerals Metallurgy (Malaga, Western Australia) has conducted a test programme in which a refractory gold ore sample was beneficiated by bench-scale floatation to generate a bulk sulphide concentrate grading 10.6 g/t Au, 13.1% S, 11.4% Fe, 0.18% C and 2.36% As. Mineralogical analyses determined that gold in the ore was

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Bio-Oxidation of a Double Refractory Gold Ore and

Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a mixed culture containing A. ferrooxidans and L

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PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE

2012-10-4  perature, oxygen partial pressure and slurry density on oxidation kinetics and conver-sion were studied using batch tests in an autoclave. Experimental Refractory gold concentrate was supplied from pyrite-arsenopyrite mineralization in northern Finland.

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Oxidation of refractory gold concentrates and

The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures and pressures without the addition of cyanide has been studied. It involves the following aspects: the chemistry of the oxidation of pure arsenopyrite and pyrite minerals in aerated alkaline solutions; the kinetics of

get price

Leachox Refractory Process Maelgwyn Mineral Services

2019-5-14  Oxidation . ABSTRACT . The Leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale. In this paper the successful implementation of the process, from initial testing through to commissioning at one of the world’s largest refractory gold mines is described.

get price

oxidation of gold ores eutradeprotect.pl

Pressure oxidation was developed for processing refractory ores where gold is occluded in the sulfide minerals, typically pyrite or arsenopyrite. Oxidation of the sulfides at elevated temperatures and pressures liberates the gold, allowing it to be economically recovered by conventional circuits. Get More.

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Refractory Gold Ore Treatment Methods

2016-7-14  Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold

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