oxidation of gold ores
Microbial oxidation of gold ores and gold bioleaching
1994-6-1 Bio-oxidation of gold ores may be a less costly, less polluting alternative to other ox- idative pretreatments such as roasting and pres- sure oxidation. Recently, bio-oxidation of gold
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Microbial oxidation of gold ores and gold bioleaching
1994-6-1 Abstract. Much recent work in the field of biohydrometallurgy has been directed to the study of bio-oxidation of gold ores by acidophilic iron and sulfur oxidizing microorganisms. This
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[Oxidation of gold-antimony ores by a thermoacidophilic
The ores differed significantly in the content of the major metal sulfides (%): Sb(S), 0.84 to 29.95; Fe(S), 0.47 to 2.5, and As(S), 0.01 to 0.4. Independent on the Sb(S) concentration in the
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Pressure Oxidation of a Refractory Sulfide
2018-8-11 Pressure oxidation of the refractory sulfide/carbonaceous ores has gained world-wide acceptance. Compared with roasting, pressure oxidation
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Improving gold recovery from refractory gold ores
2017-3-1 Refractory gold concentrates used in the investigations were obtained by flotation of high-sulfidation and low sulfidation gold ores originally from Sumatra and Sulawesi Region, in
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Pore Evolution in Refractory Gold Ore Formed by
2022-1-20 Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by
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Gold Sulphide Ore Oxidation by Alkaline Pressure
2017-10-20 The alkaline pressure oxidation of sulfidic gold ores is advantageous due to its relatively mild operating conditions of 100° C and 40 psig oxygen pressure. This translates to simpler and possibly cheaper materials of
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Flotation of Gold and Gold-Bearing Ores ScienceDirect
2016-1-1 Mercaptobenzothiazole (MBT, Aeropromoter 404) is a fairly specialized collector ( Finkelstein and Poling, 1977) and is the preferred collector for the flotation of gold and gold
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Enhanced Gold Recovery from Alkaline Pressure Oxidized
2022-1-10 Pressure oxidation is a widely accepted method to treat refractory gold ores. Gold recovery is generally lower from alkaline than acidic pressure oxidation discharge due to
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Processing of refractory gold ores ScienceDirect
1991-1-1 Processing of refractory gold ores 1037 The oxidation tanks themselves are often configured in four stages with additional tanks employed in the first stage to accommodate the
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Microbial oxidation of gold ores and gold bioleaching
1994-6-1 Abstract. Much recent work in the field of biohydrometallurgy has been directed to the study of bio-oxidation of gold ores by acidophilic iron and sulfur oxidizing microorganisms. This work has been done worldwide and has resulted in several pilot plant and commercial scale operations for gold ore bio-oxidation.
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Gold Sulphide Ore Oxidation by Alkaline Pressure
2017-10-20 The alkaline pressure oxidation of sulfidic gold ores is advantageous due to its relatively mild operating conditions of 100° C and 40 psig oxygen pressure. This translates to simpler and possibly cheaper materials of
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PRESSURE OXIDATION OF REFRACTORY GOLD ORES:
2016-7-5 Pressure oxidation test work was conducted in North America and in Australia on concentrates containing 2.8 3.8 g/t gold, 100 117 g/t silver, 24 26% iron and 27 29% sulfur. The results of this work and a high level presentation of their impact on engineering outcomes are presented in this paper. ALTA 2014 Gold-PM Proceedings 1
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Pressure oxidation, gold Big Chemical Encyclopedia
Pressure oxidation, gold A list of the mines where different processing of gold ores is carried out is shown in Table 5.12. Although the pressure oxidation process appears to be the current leading technology, selection of the optimum route depends on several factors. Bruckard, W. J. Sparrow, G. J. Woodcock, J. T. Gold and silver extraction from Hellyer lead-zinc flotation middlings using
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Microbial oxidation of gold ores and gold bioleaching
Abstract Much recent work in the field of biohydrometallurgy has been directed to the study of bio-oxidation of gold ores by acidophilic iron and sulfur oxidizing microorganisms. This work has been done worldwide and has resulted in several pilot plant and commercial scale operations for gold ore bio-oxidation. Bioleaching of gold by metabolic
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Pore Evolution in Refractory Gold Ore Formed by
2022-1-20 Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction are used to explore
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Oxidation of gold-antimony ores by a thermoacidophilic
2014-1-29 The ores differed significantly in the content of the major metal sulfides (%): Sb S, 0.84 to 29.95; Fe S, 0.47 to 2.5, and As S, 0.01 to 0.4. Independent of the Sb S concentration in the experimental sample, after adaptation to a specific ore and pulp compaction, the microorganisms grew actively and leached/oxidized all gold-antimony ores at
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Bacterial Oxidation of Refractory Ores
2018-9-21 Stability of Precipitates. The bacterial oxidation (BIOX) process for the pre-treatment of refractory ores for gold recovery was developed by the Genmin Process Research laboratory. Early work started in the late 1950’s
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Atmospheric Alkaline Pre-Oxidation of Refractory
2018-11-13 Results of this study show that aerated pre-oxidation of three of the four ores tested increased gold extraction compared to conventional cyanidation. Higher caustic dosages may have led to increased oxidation and were symptomatic of elevated release of sulphuric acid due to sulphide oxidation. Gold
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Pressure Oxidation Pretreatment of Refractory Gold
Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented. The chemistry of the
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(PDF) Oxidation of gold-antimony ores by a
2013-11-1 ore and pulp compaction, the microorganisms grew acti vely and leached/oxidized all gold–antimony ores at 39 ± 1°C. The lower was the content of iron and arsenic sulfides, the higher w as
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Gold Sulphide Ore Oxidation by Alkaline Pressure
2017-10-20 The alkaline pressure oxidation of sulfidic gold ores is advantageous due to its relatively mild operating conditions of 100° C and 40 psig oxygen pressure. This translates to simpler and possibly cheaper materials of
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Atmospheric alkaline pre-oxidation of refractory sulphide
1999. Abstract Accumulation of elemental sulfur during pyrite oxidation lowers the efficiency of coal desulfurization and bioleaching. In the case of pyrite bioleaching by Leptospirillum ferrooxidans, an. 95. On the solution chemistry of cyanidation of gold and silver bearing sulphide ores. A critical evaluation of thermodynamic calculations.
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Atmospheric alkaline pre-oxidation of refractory sulphide
Results of this study show that aerated pre-oxidation of three of the four ores tested increased gold extraction compared to conventional cyanidation. Higher caustic dosages may have led to increased oxidation and were symptomatic of elevated release of sulphuric acid due to sulphide oxidation. Gold extraction was seen to rise in most cases
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Bacterial Oxidation of Refractory Sulfide Ores for Gold
2008-9-27 Abstract. The microbiological leaching of refractory sulfide ores (pyrite, arsenopyrite) for recovery of gold is reviewed in this article. The underlying physiological, biochemical, and genetic fundamentals of the bacteria involved (Thiobacillus and Sulfolobus spp.) are complex and have yet to be elucidated in depth.The chemistry of acid and biological leaching of pyrite and
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Pore Evolution in Refractory Gold Ore Formed by
2022-1-20 Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction are used to explore
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Economic evaluation of biooxidation of gold ores
Abstract. Biooxidation of gold ores or concentrates could be a very attractive alternative to pressure oxidation (POX) or roasting to liberate the gold grains from various sulfides. Crushed heap bioleaching was successful in US and many operations using tank bioleaching of gold concentrate are currently running around the world.
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Pressure Oxidation Pretreatment of Refractory Gold
Pressure oxidation of gold containing concentrates and ores is an effective pretreatment for liberating refractory gold. This is particularly true when an appreciable portion of the gold is associated with sulfides and is not amenable to conventional cyanidation. A brief review of the literature on pressure oxidation of refractory gold materials is presented. The chemistry of the
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Oxidation of Gold-Bearing Pyrite by Ammonium Persulfate
2021-8-9 Abstract Advanced oxidation processes (AOPs) are widely used in water treatment. Thus, we applied an FeSO4–S2O82− system to the oxidation pretreatment of Carlin-type primary gold ore. Based on this research, we have continued to explore the initiator (nZVI/FeO/FeSO4) in the ammonium persulfate (APS) system. In this study, when the concentration of nano-zero
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The BIOX® Process for Biooxidation of Gold-Bearing Ores
GENCOR S.A. Ltd. has pioneered the commercialization of biooxidation of refractory gold ores. Development of the BIOX ® process started in the late 197os at GENCOR Process Research, in Johannesburg, South Africa. The early work was championed by Eric Livesey-Goldblatt, the manager of GENCOR Process Research who directed pioneering and innovative research into
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