• Leaching of silver sulfide with ferricyanide–cyanide ...

    2007-8-1  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

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  • The leaching of silver sulfide with the thiosulfate ...

    1998-11-1  Flett et al. investigated silver sulfide (argentite) leaching using solutions of thiosulfate which contained copper sulfate and proposed a reaction mechanism that emphasizes the importance of the presence or absence of air for the formation of the product as cupric or cuprous sulfide.

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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 an effective oxidant to

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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 sulfide with ferricyanide–cyanide ...

    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 (Ag2S) typically results in low overall silver extraction. Leaching of silver sulfide with ferricyanide–cyanide has been investigated with the purpose of increasing the silver

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  • Silver sulfide leaching with thiosulfate in the presence ...

    2013-5-1  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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  • STUDY ON THE LEACHING OF SILVER SULFIDE WITH

    The leaching behavious of silver sulfide with chloride solution are studied by using of thermodynamic analysis and kinetics calculation with a PC-1500 computr. The thermodynamic posibility of the. leaching of silver sulfide by ferric chloride-sodium chloride solution is determined by the E-log [Cl~-] diagram. The influences of particle size of Ag_2S, the initial pH values of the leaching ...

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  • Silver sulfide leaching with a copper-thiosulfate

    2011-3-26  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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  • Fundamental aspects of thiosulfate leaching of silver ...

    2017-5-26  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

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  • Recovery of Silver, Gold, and Lead From a Complex

    cover gold, silver, and byproduct lead from a complex lead-zinc sulfide ore. A ferric chloride (FeCI3 ) preleach, at 40° C in 6 h, extracted about 50 pct of the zinc and formed insoluble silver and lead chlorides. Subsequent acid thiourea leaching, for 1 to 3 h at 40° C, extracted

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  • Silver sulfide leaching with thiosulfate in the presence ...

    Abstract Thiosulfate is a promising alternative for the hydrometallurgical treatment of silver sulfide ores. In this study, the copper–ammonia catalyzed thiosulfate leaching of a silver sulfide rotating disk is investigated. The leaching of silver sulfide by a copper–ammonia thiosulfate solution occurs either by the substitution of cupric or cuprous for silver.

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  • STUDY ON THE LEACHING OF SILVER SULFIDE WITH

    The leaching behavious of silver sulfide with chloride solution are studied by using of thermodynamic analysis and kinetics calculation with a PC-1500 computr. The thermodynamic posibility of the. leaching of silver sulfide by ferric chloride-sodium chloride solution is determined by the E-log [Cl~-] diagram. The influences of particle size of Ag_2S, the initial pH values of the leaching ...

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

    【摘要】: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 ...

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

    Effect of ammonia concentration The residue of silver sulfide leaching with the copper- The effect of ammonia concentration between 0 and 2.5 thiosulfate solution in the absence of ammonia is a kind of mol/L on the thiosulfate leaching of silver sulfide was in- black powder, which is cuprous sulfide (Cu2S) identified vestigated.

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  • Fundamental aspects of thiosulfate leaching of silver ...

    2017-5-26  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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  • Thiourea Silver Leaching - 911 Metallurgist

    2018-4-15  In a neutral medium (pH 5-7), silver sulfide forms a nonprotective layer on the silver chloride surface. This layer of silver sulfide gradually dissolves in the thiourea. Early workers such as Plaksin and Kozhukhova (1941) used thiourea to dissolve gold and silver in H2SO4 and H2O2. They observed similar leaching

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  • Fundamental aspects of thiosulfate leaching of silver ...

    Thiosulfate is a promising alternative for leaching silver sulfide ores such as those at the epithermal Yanacocha deposit. These ores suffer from low silver recovery, high mercury extraction and environmental challenges when treated with conventional cyanide. In this study, cupric-ammonia, ferric-ethylenediaminetetraacetic acid (EDTA), ferric-oxalate and ferric-citrate are tested with ...

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  • Role of oxygen and ammonium ions in silver leaching

    2013-8-6  Thiosulfate leaching was developed in 1800 for the recovery of silver from high grade ores. In 1885, Russel added copper sulfate to the process making possible the leaching of silver as sulfide, arsenide, and antimonite. Berezowski and Sefton reported that the addition of ammonia improved the leaching of gold and silver from ore residues.

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  • THIOSULFATE LEACHING OF SILVER FROM A SOLID

    2015-5-22  respectively. It confirms the possibility of thiosulfate leaching application for silver extraction. The effect of Cu(II) ions addition on silver leaching from solid residue after pressure leaching was investigated at thiosulfate and ammonia concentrations of 0.5 and 0.6 mol/dm 3, respectively. The concentration of Cu(II) was 0.1 mol/dm .

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  • Highly efficient and selective leaching of silver from ...

    A system composed of persulfate salt and ammonia in highly alkaline aqueous solution is developed and examined for leaching metallic silver from elements of the electronic waste materials (e-scrap). Strong base activates persulfate ions providing in situ generation of highly reactive oxygen molecules. The oxidized metal forms then well soluble complex ions with ammonia ligands.

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

    Effect of ammonia concentration The residue of silver sulfide leaching with the copper- The effect of ammonia concentration between 0 and 2.5 thiosulfate solution in the absence of ammonia is a kind of mol/L on the thiosulfate leaching of silver sulfide was in- black powder, which is cuprous sulfide (Cu2S) identified vestigated.

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  • The leaching of silver sulphide in ferric ion media ...

    Abstract The leaching of synthetic Ag2S in FeCl3-HCl and Fe2(SO4)3-H2SO4 media was investigated using the rotating disk technique. The Ag2S dissolved relatively rapidly in FeCl3-HCl media over the temperature range 40–95°C, and with predominantly elemental sulphur formation. The dissolution kinetics consistently obeyed the parabolic rate law.

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  • Catalytic Leaching of Silver with Ferricyanide Cyanide ...

    2016-2-15  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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  • Atomic scale study of silver sulfide leaching with

    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 ...

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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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  • Fundamental aspects of thiosulfate leaching of silver ...

    Thiosulfate is a promising alternative for leaching silver sulfide ores such as those at the epithermal Yanacocha deposit. These ores suffer from low silver recovery, high mercury extraction and environmental challenges when treated with conventional cyanide. In this study, cupric-ammonia, ferric-ethylenediaminetetraacetic acid (EDTA), ferric-oxalate and ferric-citrate are tested with ...

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  • Role of oxygen and ammonium ions in silver leaching

    2013-8-6  Thiosulfate leaching was developed in 1800 for the recovery of silver from high grade ores. In 1885, Russel added copper sulfate to the process making possible the leaching of silver as sulfide, arsenide, and antimonite. Berezowski and Sefton reported that the addition of ammonia improved the leaching of gold and silver from ore residues.

  • Get Price
  • chemically leaching silver

    There have been a number of studies on the leaching of silver-sulfide with thiosulfate solutions (Alonso-Gómez and Lapidus, 2009, Briones and Lapidus, 1998, Flett et al., 1983), but more work investigating the application of this promising system is necessary to improve understanding of the complicated chemical and physical interactions. Learn ...

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  • Chloride Leaching of Silver Iodide Precipitation ...

    2017-7-3  Silver iodide precipitation experiments were conducted on a pregnant solution obtained by ferrous chloride-oxygen leaching of a copper-silver-bearing sulfide concentrate. The composition of the major elements contained in this chloride

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  • Highly efficient and selective leaching of silver from ...

    A system composed of persulfate salt and ammonia in highly alkaline aqueous solution is developed and examined for leaching metallic silver from elements of the electronic waste materials (e-scrap). Strong base activates persulfate ions providing in situ generation of highly reactive oxygen molecules. The oxidized metal forms then well soluble complex ions with ammonia ligands.

  • Get Price