leaching of silver sulfide with

The leaching of silver sulfide with the thiosulfate ...

01-11-1998  The leaching of silver sulfide with the thiosulfate–ammonia–cupric ion system 1. Introduction. The extraction of precious metals using sodium cyanide solutions was patented in 1887. Among the... 2. Experimental method. The operating conditions for the group of experiments were selected to guarantee ...

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Leaching of silver sulfide with ferricyanide–cyanide ...

01-08-2007  Leaching of silver sulfide with ferricyanide–cyanide has been investigated with the purpose of increasing the silver extraction. Ferricyanide proved to be an effective oxidant to dissolve silver sulfide in cyanide solution.

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Leaching of silver sulfide with ferricyanide–cyanide ...

Leaching of silver sulfide with ferricyanide–cyanide has been investigated with the purpose of increasing the silver extraction. Ferricyanide proved to be

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Silver sulfide leaching with thiosulfate in the presence ...

01-05-2013  The leaching of silver sulfide by a copper–ammonia thiosulfate solution occurs either by the substitution of cupric or cuprous for silver. The cupric reaction is favored due to a thermodynamic barrier to the cuprous reaction.

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Silver sulfide leaching with thiosulfate in the presence ...

01-05-2013  Ferric–citrate effectively leached silver sulfide, but consumed more thiosulfate than ferric–EDTA due to the lower pH used. The potential utility of ferric–EDTA and ferric–oxalate for leaching silver sulfide has been confirmed in this work.

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Silver sulfide leaching with a copper-thiosulfate solution ...

26-03-2011  Leaching from silver sulfide using a copper-thiosulfate solution in the absence of ammonia was investigated. It is found that silver sulfide could be effectively dissolved in the copper-thiosulfate system without ammonia.

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Sulphide Leaching - 911 Metallurgist

24-06-2015  Most sulphides are oxidized to sulphate. From the sulphated ore, all of the zinc, copper and iron can be leached with water while lead, silver, gold and antimony will remain in the insoluble residue. Leaching of an Arsenical Copper Sulfide Concentrate

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Recovery of Silver, Gold, and Lead From a Complex Sulfide ...

tion is usually low with complex sulfide gold-silver ores. A procedure to extract silver from sulfide ores with FeC13 was patented by Hey in 1922 (6). Considera­ ble work was completed by-Wong (7) to re­ cover lead from a galena concentrate with a combined FeC13-NaCl leach solution. Because both lead and silver

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THIOSULFATE LEACHING OF SILVER FROM A SOLID RESIDUE

Berezowsky and Sefton (1979) investigated silver recoveries from oxidation leach residues of copper sulfide concentrates in different leaching systems, including cyanide, thiourea, chloride and thiosulfate solutions. The results of thiosulfate leaching showed that the presence of copper in the solution enhanced silver extraction

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Direct Leaching of sulfides: Chemistry and applications ...

The sulfide minerals associated with copper, nickel, zinc, lead, and molybdenum concentrates are described according to their thermodynamic stability zones on Eh-pH diagrams. From these zones, the chemistry associated with various thermodynamically feasible decomposition paths is discussed, and process developments associated with the most favorable decomposition paths are briefly reviewed.

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The leaching of silver sulfide with the thiosulfate ...

Abstract In recent years, there has been renewed interest in the use of thiosulfate as a substitute for cyanide in gold and silver leaching. Copper has been recognized to act as a catalyst in the process, and ammonia to stabilize the system. However, discrepancies exist in the literature concerning the oxidizing agent and, specifically in the case of silver sulfide (argentite), whether the ...

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Silver sulfide leaching with a copper-thiosulfate

26-03-2011  Leaching from silver sulfide using a copper-thiosulfate solution in the absence of ammonia was investigated. It is found that silver sulfide could be effectively dissolved in the copper-thiosulfate system without ammonia. The effects of thiosulfate concentration, copper- to-thiosulfate ratio, agitation vigorousness, pH values, and dissolved gases on the leaching of silver sulfide with the ...

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(PDF) Silver sulfide leaching with a copper-thiosulfate ...

Eng., 2001, 14 (6): 615. mum silver sulfide extraction ratio of 95.1% was achieved [10] Ayata S. and Yildiran H., Optimization of extraction of silver by leaching at room temperature with a solution of the 0.12 from silver sulphide concentrates by thiosulphate leaching

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Catalytic Leaching of Silver with Ferricyanide Cyanide ...

The leaching kinetics of mixed sulfide minerals in ferricyanide-cyanide solutions showed that non-silver sulfide minerals decrease silver extraction from syntheti c silver sulfide to different extents. A significant decrease on silver extraction is observed in the presence of chalcopyrite and pyrrhotite.

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Fundamental aspects of thiosulfate leaching of silver ...

conventional cyanidation for silver sulfide leaching. The leaching of silver sulfide by cupric-ammonia thiosulfate can occur either by the substitution of cupric or cuprous for silver. The cupric catalyzed reaction is favored due to a thermodynamic barrier to the cuprous reaction. Rotating disk experiments demonstrate that

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Atomic scale study of silver sulfide leaching with cyanide ...

In this work, the outcome of leaching synthetic acanthite –a surrogate for a silver-containing sulfide ore- with both cyanide ion and thiourea are studied with DFT considering solvent effects. The results are correlated to the experimental percentage of silver extracted with each of the leaching agents under similar conditions of molar concentration, temperature and percentage of solids.

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Influences of silver sulfide on the bioleaching of ...

The effects of silver sulfide (Ag2S) on the bioleaching of chalcopyrite and pyrite were investigated in this paper. It has been shown that Ag2S enhanced the yields of bioleaching of chalcopyrite but inhibited the bio-oxidation of pyrite. The addition of Ag2S selectively increased the copper dissolution from the chalcopyrite-containing ores in shake flasks with a recovery of 85.3% compared with ...

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Direct Leaching of sulfides: Chemistry and applications ...

The sulfide minerals associated with copper, nickel, zinc, lead, and molybdenum concentrates are described according to their thermodynamic stability zones on Eh-pH diagrams. From these zones, the chemistry associated with various thermodynamically feasible decomposition paths is discussed, and process developments associated with the most favorable decomposition paths are briefly reviewed.

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Gold and Silver Leaching by Cyanidation - 911 Metallurgist

18-04-2016  Introduction to Gold and Silver Leaching. The cyanide leaching process is the most important method ever developed for extracting gold from its ores. The early development of the process is attributed to a Scotchman, John Stewart Mac Arthur, in collaboration with the Forrest brothers. The method was introduced into South Africa in 1890.

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GALVANIC INTERACTIONS OF SULFIDE MINERALS IN LEACHING

copper leaching. Electrochemical nature of sulfides flotation (Chanturija and Vigdergauz, 2009) and leaching along with electrocatalytic properties of pyrite has already been described (Majima and Peters, 1968; Nowak et al., 1984; Holmes and Crundwell, 1995) and used for leaching of copper sulphidic concentrates in the

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The leaching of silver sulfide with the thiosulfate ...

Abstract In recent years, there has been renewed interest in the use of thiosulfate as a substitute for cyanide in gold and silver leaching. Copper has been recognized to act as a catalyst in the process, and ammonia to stabilize the system. However, discrepancies exist in the literature concerning the oxidizing agent and, specifically in the case of silver sulfide (argentite), whether the ...

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leaching of silver ore and with lanced chemical reaction

Chemical Leaching Of Silver Lead Ore. Silver is found in lead inc gold and copper ore deposits. The most important ore mineral of silver is argentite Ag2S silver sulfide. Silver is commonly extracted from ore by smelting or chemical leaching. Uses. Silver has been used for thousands of years for jewelry and decorative items of all types.

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Atomic scale study of silver sulfide leaching with cyanide ...

In this work, the outcome of leaching synthetic acanthite –a surrogate for a silver-containing sulfide ore- with both cyanide ion and thiourea are studied with DFT considering solvent effects. The results are correlated to the experimental percentage of silver extracted with each of the leaching agents under similar conditions of molar concentration, temperature and percentage of solids.

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THE FUNDAMENTAL DISSOLUTION KINETICS OF SILVER SULFIDE

Silver sulfide was practically leaching unaffected by pH and dissolved oxygen concentrations while mercury sulfide was sensitive to both leaching parameters. Dissolution rates of both species increased linearly with cyanide concentration and

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Influences of silver sulfide on the bioleaching of ...

The effects of silver sulfide (Ag2S) on the bioleaching of chalcopyrite and pyrite were investigated in this paper. It has been shown that Ag2S enhanced the yields of bioleaching of chalcopyrite but inhibited the bio-oxidation of pyrite. The addition of Ag2S selectively increased the copper dissolution from the chalcopyrite-containing ores in shake flasks with a recovery of 85.3% compared with ...

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Chloride leaching of silver and lead from a solid residue ...

Chloride leaching of silver and lead from a solid residue after atmospheric leaching ... the feed as silver sulfide and was also present as an admixture in the crystallographic lattice of other minerals such as pyrite, chalcopyrite, sphalerite (Puvvada and Murthy, 2000).

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Direct Leaching of sulfides: Chemistry and applications ...

The sulfide minerals associated with copper, nickel, zinc, lead, and molybdenum concentrates are described according to their thermodynamic stability zones on Eh-pH diagrams. From these zones, the chemistry associated with various thermodynamically feasible decomposition paths is discussed, and process developments associated with the most favorable decomposition paths are briefly reviewed.

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redox - Reaction of solid silver sulfide on warming with ...

07-07-2018  The distinct colors of the various phases involved in this system (black silver sulfide ($\ce{Ag2S}$), brown silver sulphide sulphate ($\ce{Ag6S3O4}$), white to light yellow silver sulfate ($\ce{Ag2SO4}$) and bright yellow sulfur($\ce{S}$)) are a further indicator of this behaviour; the leach went from brown ($\ce{Ag6S3O4}$) to white ($\ce{Ag2SO4}$) with increased pressure and

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Sulfides, Selenides and Tellurides: rebellious and ...

Many sulfide minerals also contain things like copper or antimony that can react with the cyanide, preventing the cyanide from leaching out the gold and silver. For information on methods to deal with and extract gold, silver and base metals from these refractory ores, I

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GALVANIC INTERACTIONS OF SULFIDE MINERALS IN LEACHING

copper leaching. Electrochemical nature of sulfides flotation (Chanturija and Vigdergauz, 2009) and leaching along with electrocatalytic properties of pyrite has already been described (Majima and Peters, 1968; Nowak et al., 1984; Holmes and Crundwell, 1995) and used for leaching of copper sulphidic concentrates in the

More

The leaching of silver sulfide with the thiosulfate ...

Abstract In recent years, there has been renewed interest in the use of thiosulfate as a substitute for cyanide in gold and silver leaching. Copper has been recognized to act as a catalyst in the process, and ammonia to stabilize the system. However, discrepancies exist in the literature concerning the oxidizing agent and, specifically in the case of silver sulfide (argentite), whether the ...

More

Catalytic leaching of silver with ferricyanide-cyanide ...

Significantly lower silver extraction than gold has been commonly observed in gold-silver cyanidation plants, especially in heap leaching operations. The different mineralogy of gold and silver in the ores is suspected to be the main reason, e.g., the occurrence of low solubility acanthite may result in low overall silver extraction. Leaching of silver sulfide with ferricyanide and its ...

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leaching of silver ore and with lanced chemical reaction

Chemical Leaching Of Silver Lead Ore. Silver is found in lead inc gold and copper ore deposits. The most important ore mineral of silver is argentite Ag2S silver sulfide. Silver is commonly extracted from ore by smelting or chemical leaching. Uses. Silver has been used for thousands of years for jewelry and decorative items of all types.

More

THE FUNDAMENTAL DISSOLUTION KINETICS OF SILVER SULFIDE

Silver sulfide was practically leaching unaffected by pH and dissolved oxygen concentrations while mercury sulfide was sensitive to both leaching parameters. Dissolution rates of both species increased linearly with cyanide concentration and

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Chloride leaching of silver and lead from a solid residue ...

Chloride leaching of silver and lead from a solid residue after atmospheric leaching ... the feed as silver sulfide and was also present as an admixture in the crystallographic lattice of other minerals such as pyrite, chalcopyrite, sphalerite (Puvvada and Murthy, 2000).

More

GALVANIC INTERACTIONS OF SULFIDE MINERALS IN LEACHING

copper leaching. Electrochemical nature of sulfides flotation (Chanturija and Vigdergauz, 2009) and leaching along with electrocatalytic properties of pyrite has already been described (Majima and Peters, 1968; Nowak et al., 1984; Holmes and Crundwell, 1995) and used for leaching of copper sulphidic concentrates in the

More

Sulfides, Selenides and Tellurides: rebellious and ...

Many sulfide minerals also contain things like copper or antimony that can react with the cyanide, preventing the cyanide from leaching out the gold and silver. For information on methods to deal with and extract gold, silver and base metals from these refractory ores, I

More

Establishing thE ProcEss MinEralogy of gold orEs

direct cyanide leaching. Some epithermal deposits may be free-milling (such as the oxidized portion) but more commonly contain significant amounts of sulfides in which gold occurs as tiny inclusions or submicroscopic gold and are therefore refractory. Silver-rich ores and copper sulfide ores: Silver-rich ores and copper sulfide ores are

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Gold Recovery 101 - Sepro Systems

Various minerals can interfere with the leaching process by consuming cyanide or dissolved oxygen. In the case of pyrrhotite, a notorious oxygen consumer, pre-aeration of the leach slurry before cyanide addition can passivate the sulfide mineral and allow the leach to proceed normally. Both sulfide and

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Effect of Pretreatment on Leaching Primary Copper Sulfide ...

Silver and gold were then accessible for cyanidation. The result indicates that the recovery of silver and gold improves with pretreatment. Chen et al. [16] pretreated spent auto-catalyst samples to recovery Rh using O2, CO and H2 at different temperatures and flow rates. The samples pretreated were then leached with acidic sodium chlorate.

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