cyanidation of a pyrrhotite bearing gold ore
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cyanidation of a pyrrhotite bearing gold ore

(PDF) Cyanidation of a pyrrhotite-bearing gold ore

Effect of oxygen on gold leaching of a pyrrhotite-bearing gold ore (Cyanidation: pH 11.2, 200g/t Pb(NO 3 ) 2 , 32h)

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Cyanidation of a pyrrhotite-bearing gold ore

2015-12-27  The Musselwhite Mine in Canada processes a free milling gold ore at 5.5-5.8g/t Au and 4.2% pyrrhotite. A laboratory investigation was conducted to improve cyanidation. The pyrrhotite was determined to be 50% monoclinic and 50% hexagonal. A leach using 8ppm dissolved oxygen yielded only 82.3% gold extraction with a 0.29kg/t NaCN consumed.

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cyanidation of a pyrrhotite bearing gold ore

Cyanidation of a pyrrhotite-bearing gold ore 2015-12-27 The Musselwhite Mine in Canada processes a free milling gold ore at 5.5-5.8g/t Au and 4.2% pyrrhotite. A laboratory investigation was conducted to improve cyanidation. The

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Advances in the Cyanidation of Gold - ScienceDirect

2016-1-1  Effect of lead nitrate and oxygen addition on the leaching of a pyrrhotite-bearing gold ore with addition of lead nitrate (preleaching: pH 11.2, 0.5 h, 8 ppm O

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Effect of oxygen and lead nitrate on the cyanidation

1995-8-1  The highest gold recovery was 96.0% at pH 10.5 with a cyanide consumption of 0.70 kg/t (Table 3). The gold recovery was reduced to 91.2% and the cyanide consumption to 0.52 kg/t at pH 11.5. pH 10.5 demonstrated to be more interesting in spite of the higher cyanide consumption.

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Gold recovery from a refractory pyrrhotite ore by ...

The aim of the present investigation was to study the biooxidation of a refractory gold-bearing pyrrhotite, in order to increase the gold recovery during the subsequent conventional cyanidation. Bacterial cultures utilised in the biological test consisted predominantly of Thiobacillus genus. Tests were conducted at

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Cyanide Leaching and Decomposition of Pyrrhotite

2015-10-14  Thus, pyrrhotite is not only a cyanicide but it also consumes oxygen in solution necessary for gold dissolution. Pyrrhotite, if kept dry, is stable but in the presence of water and air, it breaks down rapidly forming such compounds as sulphuric acid, ferrous sulphate, basic iron sulphates, ferrous carbonates

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Reactions of gold and sulfide minerals in cyanide

2002-11-1  The effect of pyrite, pyrrhotite, chalcopyrite, realgar and arsenopyrite on gold dissolution in cyanide media was investigated. The cyanidation of synthetic gold ores in the presence of various concentrations of sulfides was studied under constant experimental conditions. A mineralogical analysis of the minerals was performed.

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Characterization of refractory behaviour of complex

cyanidation of pyrrhotite produced by py ... a new diagnostic approach including alkaline leaching to characterize the refractoriness of iron oxy/hydroxide bearing gold/silver ore was developed by ...

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(PDF) Cyanidation of Refractory Gold Ores: A Review

2, 3 Poor cyanidation results are often obtained when sulfide minerals are present in gold ores. 4 Common sulfide minerals associated with gold ores are pyrite, pyrrhotite,

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Cyanide Leaching and Decomposition of Pyrrhotite

2015-10-14  An EXAMPLE ore deposit is know for its gold bearing pyrite concentrate containing pyrrhotite and chalcopyrite is preaerated in a high lime solution ahead of cyanidation. Optimum results as regards gold extraction and cyanide consumption are

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Reactions of gold and sulfide minerals in cyanide

2002-11-1  The effect of pyrite, pyrrhotite, chalcopyrite, realgar and arsenopyrite on gold dissolution in cyanide media was investigated. The cyanidation of synthetic gold ores in the presence of various concentrations of sulfides was studied under constant experimental conditions. A mineralogical analysis of the minerals was performed. The leaching kinetics were determined.

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(PDF) Reactions of gold and sulfide minerals in

Cyanidation of a pyrrhotite-bearing gold ore. Article. Full-text available. Jan 2003; G. Deschênes; D Hall; M. Fulton; The Musselwhite Mine in Canada processes a free milling gold ore at 5.5-5.8g ...

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The effects of dissolved oxygen and cyanide dosage

The results of cyanidation of a pre-oxidized pyrrhotite-rich gold ore in laboratory leaching experiments and in plant trials are presented to highlight the effects of particle size, oxygen and cyanide concentrations during pre-oxidation and cyanidation on the overall gold extraction. The Multi Mix Systems (MMS) unit for oxygen injection significantly enhances the mass transfer of reagents and ...

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Characterization of refractory behaviour of complex

cyanidation of pyrrhotite produced by py ... a new diagnostic approach including alkaline leaching to characterize the refractoriness of iron oxy/hydroxide bearing gold/silver ore was developed by ...

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Control of lead nitrate addition in gold recovery - Her ...

Deschênes “Cyanidation of a Pyrrhotite-Bearing Gold Ore from Musselwhite Mine”; Ann. Mtg. Cdn. Min. Proc., Canada, Jan., 2002, 735-755. Primary Examiner: BOS, STEVEN J . Attorney, Agent or Firm: Aventum IP Law LLP (Kanata, ON, CA) Claims: What is claimed is: 1. A method for improving the efficiency of a gold cyanidation leach process by ...

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(PDF) Cyanidation of Refractory Gold Ores: A Review

In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur were ...

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Treatment of copper-rich gold ore by cyanide leaching ...

2015-3-2  sulphide minerals during cyanidation of gold [13,14,16]. Preleaching of ore can be undertaken to remove reactive copper minerals prior to cyanide leaching of gold. SCERESINI and STAUNTON [17] proposed the removal of copper by cyanide leaching without aeration prior to gold extraction and then adsorption of copper on activated carbon.

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Gold Cyanidation Process - 911 Metallurgist

2015-8-12  The Cyanidation Process or CYANIDE LEACHING is ‘most notably used in the recovery of gold. Safety and environmental concerns are of prime importance in the operation of a cyanidation plant. As we get farther into this type of recovery you will see why. The preparation of the ore

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[Biooxidation of gold-bearing sulfide ore and

Gold and silver recovery rates from unoxidized ore (control experiment) by cyanidation were 20.9 and 26.8%, respectively. Thiosulfate leaching of unoxidized ore allowed the extraction of 38.8 and 24.2% of the gold and silver, respectively. Cyanidation residues were treated with bacteria of the genus Alcaligenes in order to destruct cyanide.

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Characterization of refractory behaviour of complex

cyanidation of pyrrhotite produced by py ... a new diagnostic approach including alkaline leaching to characterize the refractoriness of iron oxy/hydroxide bearing gold/silver ore was developed by ...

More

Treatment of copper-rich gold ore by cyanide leaching ...

2015-3-2  sulphide minerals during cyanidation of gold [13,14,16]. Preleaching of ore can be undertaken to remove reactive copper minerals prior to cyanide leaching of gold. SCERESINI and STAUNTON [17] proposed the removal of copper by cyanide leaching without aeration prior to gold extraction and then adsorption of copper on activated carbon.

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Characterization of refractory behaviour of complex gold ...

2009-6-10  1.3% to 2.4% of the gold was leachable with direct cyanidation and approximately 95% of Au in ore was extracted by means of selective destruction of gold-bearing minerals with nitric and sulphuric acids. TEAGUE et al[22] studied diagnostic leaching of a refractory gold ore containing 5.9% pyrrhotite

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Recovery of gold from sedimentary gold-bearing ores ...

Abstract: Gold-bearing ore of sedimentary origin containing organic carbonaceous material and gold-bearing sulfides is treated to increase the recovery of the gold content thereof by standard cyanidation practice. An aqueous slurry of the finely ground ore is first subjected to a preliminary oxidation treatment wherein air or oxygen is bubbled ...

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[Biooxidation of gold-bearing sulfide ore and

Gold and silver recovery rates from unoxidized ore (control experiment) by cyanidation were 20.9 and 26.8%, respectively. Thiosulfate leaching of unoxidized ore allowed the extraction of 38.8 and 24.2% of the gold and silver, respectively. Cyanidation residues were treated with bacteria of the genus Alcaligenes in order to destruct cyanide.

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M. Fulton's research works Natural Resources Canada ...

Cyanidation of a pyrrhotite-bearing gold ore. Article. Full-text available. Jan 2003; G. Deschênes. D Hall. M Fulton. The Musselwhite Mine in Canada processes a free milling gold ore at 5.5-5.8g ...

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(PDF) Refractory gold-bearing ores: a review of

Hydrometallurgy, 34 (1994) 383-395 383 Elsevier Science B.V., A m s t e r d a m Refractory gold-bearing ores: a review of treatment methods and recent advances in biotechnological techniques Nieves Iglesias and Francisco Carranza Chemical Engineering Department, Universityof Sevilla, 41012 Sevilla, Spain (Received January 10, 1993; revised version accepted March 16, 1993) ABSTRACT The problem ...

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The effects of dissolved oxygen and cyanide dosage

The results of cyanidation of a pre-oxidized pyrrhotite-rich gold ore in laboratory leaching experiments and in plant trials are presented to highlight the effects of particle size, oxygen and cyanide concentrations during pre-oxidation and cyanidation on the overall gold extraction. The Multi Mix Systems (MMS) unit for oxygen injection significantly enhances the mass transfer of reagents and ...

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Release of arsenic from cyanidation tailings

At a gold mine in northern Sweden, gold occurring as inclusions in pyrrhotite and arsenopyrite is leached by cyanidation of the ore. The main sulphide minerals in the ore are pyrrhotite and arsenopyrite. Effluents from the cyanidation process are treated with Fe2(SO4)3 to form Fe-precipitates suitable for the co-precipitation of As.

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Beneficiation and Characterization of Gold from

2014-7-24  O. D. Ogundare et al. 303 In Figure 1(a), which shows the gold ore, about eighteen (18) peaks starting from 2= 15˚ to 2θ θ = 100˚ were observed while the extracted gold shown in Figure 1(b) revealed about five (5) peaks starting from 2θ = 45˚ to 2θ = 100˚. The SEM (Plate 1(a) and Plate 1(c)) shows that the morphology of the particles of gold ore from Itagunmodi

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