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cyanidation of a pyrrhotite bearing gold ore

(PDF) Cyanidation of a pyrrhotite-bearing gold ore

Effect of lead nitrate addition on the leaching of a pyrrhotite-bearing gold ore (Cyanidation: pH 11.2, 380ppm NaCN, 8ppm O 2,32h) Figure 5 illustrates the

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Cyanidation of a pyrrhotite-bearing gold ore

2015-12-27  Cyanidation of a pyrrhotite-bearing gold ore G. Deschênes1*, D. Hall2 and M. Fulton1 1 Mining and Mineral Sciences Laboratories, CANMET, Natural Resources Canada, 555 Booth Street, Ottawa, Ontario, K1A 0G1 Canada 2 Placer Dome Canada, Musselwhite Mine, P.O. Box 7500,Thunder Bay, Ontario, P7B 6S8 Canada Received 30 July 2002; accepted 21

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Gold recovery from a refractory pyrrhotite ore by

The gold content of the ore sample, coming from Bolivia, was of 10 g t −1 Au. After 24 h leaching time by direct cyanidation, low gold recovery was obtained (<20% Au), with a high reagent consumption. On the other hand, a high gold recovery was achieved for the biooxidated samples: after 24 h cyanidation gold dissolution reached about 91% Au.

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Advances in the Cyanidation of Gold ScienceDirect

2016-1-1  The Musselwhite Mine treats a pyrrhotite-bearing ore containing mostly free gold (5.5–5.8 g/t Au, 4.2% pyrrhotite). The pyrrhotite is both monoclinic (50%) and hexagonal (50%). Cyanidation with the addition of lead nitrate was already part of the plant strategy at the beginning of the project.

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Effect of oxygen and lead nitrate on the cyanidation of a

1995-8-1  The pre-leach dissolves and oxidizes soluble sulphides from pyrite, pyrrhotite and chalcopyrite dissolution to sulphate according to: S2 + 202 -4 S042 100 90 80 70 60 50 W 40 30 10 n,t i Leach Pre-leach Leach + Oz + Pb(NO,)p 24 12 Time (h) 36 48 Fig.2 Effect of pre-leaching and oxidants on leaching of gold from a sulphide bearing gold ore

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pyrrhotite bearing gold ore daikichisushi.fr

Cyanidation of a pyrrhotite-bearing gold ore162 Кб The average calculated gold content of the overall sample (obtained from all the tests) is 5.75g/t with a variance of 0.05.and cyanide consumption during the cyanidation of a pyrrhotite-bearing gold ore as a function of lead nitrate addition The mass balance calculation on cyanide showed that

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The effects of dissolved oxygen and cyanide dosage on

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

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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

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Cyanidation of a copper-gold ore ScienceDirect

1997-8-1  Effect of lead nitrate on gold leaching of a copper-gold ore. Pre-leaching: 30 min; cyanidation: pH 10.5, NaCN 710 mg/L, 02 15 ppm, 48 h. Pb (NO3)2 to 97.8% with 300 g/t Pb (NO3)2 (tests 4 to 6). The gold recovery remains the same for Pb (NO3)2 concentrations greater than 300 g/t (test 7).

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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

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phyrrotite cyanidation effect foodforneighbours.nl

2019-12-11  Cyanidation Of A Pyrrhotitebearing Gold Ore 911. An electrochemical study indicated that pyrrhotite oxidation is much slower than the cyanidation of gold and is an unlikely reaction to significantly consume dissolved oxygen and cyanide dunn et al 1995 pyrrhotite is in much higher concentration than gold in a gold ore .

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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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The effects of dissolved oxygen and cyanide dosage on

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

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Effect of Oxygen on Gold Leaching

2015-12-25  The pH conditions for gold dissolution to occur the Eh-pH diagram for the gold-cyanide aqueous system. The area above the O2/H2O line represents the Eh-pH range under which oxygen reduction can occur (and corresponding oxidation of gold). Cyanidation of a pyrrhotite-bearing gold ore

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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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G. DESCHÊNES Principal Engineer, Precious metals

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

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Preg-robbing phenomena in the cyanidation of sulphide

In this study, the preg-robbing characteristics of a copper-rich gold ore and a pyritic gold ore were evaluated based on the adsorption of gold by ore from the spiked solutions (0-5 mg/L Au).

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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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Cyanide Leaching Chemistry & Gold Cyanidation

2015-2-6  Cyanide Leaching Chemistry. In a relatively simple system of this type the gold dissolves readily. The only requirements are that the gold be free and clean, that the cyanide solution contain no impurities that might inhibit the reaction, and that an

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Cyanidation of gold ores c.pdf Free Download PDF Ebook

2018-6-15  The results of gold recovery and cyanide consumption versus variation of time and temperature of roasting process are presented in Table 6. cyanide consumption increased for ore and its gold and arsenic grades were 10.5 4000 3650 97. Despite the difference in rate.16 min− 1 for the first and second samples.65 10.

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The effects of dissolved oxygen and cyanide dosage on

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

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The effects of dissolved oxygen and cyanide dosage on

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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G. DESCHÊNES Principal Engineer, Precious metals

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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Preg-robbing phenomena in the cyanidation of sulphide

In this study, the preg-robbing characteristics of a copper-rich gold ore and a pyritic gold ore were evaluated based on the adsorption of gold by ore from the spiked solutions (0-5 mg/L Au).

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Gold Cyanidation Process Mineral Processing & Metallurgy

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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Cyanide Leaching Chemistry & Gold Cyanidation

2015-2-6  Cyanide Leaching Chemistry. In a relatively simple system of this type the gold dissolves readily. The only requirements are that the gold be free and clean, that the cyanide solution contain no impurities that might inhibit the reaction, and that an

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Cyanidation of gold ores c.pdf Free Download PDF Ebook

2018-6-15  The results of gold recovery and cyanide consumption versus variation of time and temperature of roasting process are presented in Table 6. cyanide consumption increased for ore and its gold and arsenic grades were 10.5 4000 3650 97. Despite the difference in rate.16 min− 1 for the first and second samples.65 10.

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Resin-in-leach cyanidation of a carbonaceous gold ore

Resin-in-leach (RIL) cyanidation experiments were performed on a refractory carbonaceous gold ore. The objective of this investigation was to determine if strong-base ion exchange resins could adsorb the soluble aurocyanide complex in preference to natural “preg robbing” organic constituents. Direct cyanidation of the carbonaceous gold ore used in this study resulted in less than 2% gold

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Biooxidation of gold-bearing sulfide ore and subsequent

2016-7-27  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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8 Types of Gold Ore- Properties and Ways to Process

2021-7-12  Gold mainly appears in the form of natural gold and minerals in the ore such as pyrite, tellurium ore, sphalerite, and gold in gangue, etc. About 70% to 75% of the gold in the deposit is in the form of natural gold, while the other 20% occurs in the form of telluride.

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