Silver Leaching Thiosulfate Nitrite

Study of thiosulfate leaching of silver sulfide in the ...

In recent year, some researchers have found that the kinetics of leaching of silver using thiosulfate are controlled by the mass transfer of oxygen to the solidliquid interface (Rivera et al., 2015).

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Fundamental aspects of thiosulfate leaching of silver ...

FUNDAMENTAL ASPECTS OF THIOSULFATE LEACHING OF SILVER SULFIDE IN THE PRESENCE OF ADDITIVES by Jared Luke Deutsch, University of Alberta, 2010 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF ... nitrates/nitrites and hydroxylamine derivatives which generally only form in the presence of

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1Ammonium Thiosulfate Ecological Viable Alternative to ...

leaching gold and silver, easy to get and manipulate. This work is done in the Technological Institute of Parral in a lowgrade ore from the southern region of the state of Chihuahua. This document has been enriched presented in the IMEC 2014, with the increase of series V and VI. Key words: Leaching, cyanide, ammonium thiosulfate. 1. Introduction

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USB2

USB2 US12/683,967 USA USB2 US B2 US B2 US B2 US A US A US A US B2 US B2 US B2 Authority US United States Prior art keywords thiosulfate precious metal calcium lixiviant leach solution Prior art date Legal status (The legal status is an assumption and is not a .

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Silver sodium thiosulphate

Aug 12, 2021 · Silver sodium thiosulphate is a silver complex used as a postharvest conditioner. A nonvolatile aqueous solution of silver and thiosulphate ions. No significant human health concerns identified. No significant environmental concerns highlighted relateddirectly to its use however wastes must not reach the public sewer as there is a risk to ...

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Table 1 from INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING .

DOI: /PPMP140207 Corpus ID: . INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF GOLD AND SILVER FROM TURKISH GOLD ORES article{Sayiner2014INFLUENCEOL, title={INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF GOLD AND SILVER FROM TURKISH GOLD ORES}, author={B. Sayiner}, .

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CAA1

silver leaching copper gold thiosulfate Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Abandoned Appliion number CA

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Silver dissolution in a novel leaching system: Reaction ...

 · Effective silver recovery is usually restricted by either environmental pollution or high recovery costs. To tackle the issues, this study introduces a novel method for the effective recovery of silver by utilizing the alkaline sodium thiosulfatepotassium ferricyanide leaching system. The reaction kinetics of silver dissolution in this system was investigated via the rotating disk electrode ...

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Chemical Leaching of Silver from Diverse ...

Leaching with the mixture of thiosulfatenitritesulfitecopper G. AlvaradoMacías et al. 32) investigated silver leaching with the system of thiosulfatenitritecopper ions. It was found that the complexes of copper and ammonia can alyze the silver dissolution.

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Nitric acid leaching of silver sulphide precipitates ...

Leaching of silver sulphide precipitates with nitric acid was performed at a variety of temperatures, pressures, acid concentrations and solids concentrations, with a maximum extraction of % ...

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THIOSULFATE LEACHING OF SILVER FROM A SOLID RESIDUE .

respectively. It confirms the possibility of thiosulfate leaching appliion 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 and mol/dm 3, respectively.

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Dissolution of Gold and Silver with Ammonium Thiosulfate ...

 · In the second stage, leaching of gold and silver values with ammonium thiosulfate was performed, and this yielded a removal of % silver and gold % with a liquid–solid ratio of 2:1. Thiosulfate consumption was g/L, which is economically affordable for this head ore with gold and silver content of g/ton and 310 g/ton, respectively.

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Recovery of Silver from the Nitrate Leaching Solution of ...

 · Silver is recovered from the leaching solution of the spent Ag/αAl 2 O 3 alyst by solvent extraction. Most of the silver in the spent alyst was dissolved by using HNO 3 solution. The parameters such as concentration of lixiviant, reaction temperature, pulp density, and stirring speed, which might affect the dissolution of silver from the spent alyst, were investigated.

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Minerals | Free FullText | Determination of Dissolution ...

The leaching of silver sulfide with the thiosulfate–ammonia–cupric ion system. Hydrometallurgy 1998, 50, 243–260. [Google Scholar] AlvaradoMacías, G.; FuentesAceituno, ; NavaAlonso, F. Study of silver leaching with the thiosulfatenitritecopper alternative system: Effect of thiosulfate concentration and leaching temperature.

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Silver sulfide leaching with a copperthiosulfate solution ...

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

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Cyanide Leaching

· Cyanide is destroyed by sodium thiosulfate or sodium nitrite. · An average fatal dose of HCN is about 5060 milligrams. · Cyanide dissolves both gold and silver from alkaline solution. · Cyanide is a very "clean" extraction system, as it does not extract many of the base metals such as iron.

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Method for thiosulfate leaching of precious metal ...

What is claimed is: 1. A process for recovering a precious metal from a precious metalcontaining material, comprising: (a) contacting the precious metalcontaining material with a thiosulfate lixiviant at superatmospheric pressure in the substantial or complete absence of added ammonia to solubilize the precious metal and form a pregnant thiosulfate leach solution containing the solubilized ...

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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, cupricammonia, ferricethylenediaminetetraacetic acid (EDTA), ferricoxalate and ferriccitrate are tested with ...

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silver leaching thiosulfate nitrite

Silver leaching with the nitritecopper novel system A . Mar 01, 0183;32;In this work a novel leaching system involving NO 2Cu species is presented, which is able to oxidize and complex the silver metal without the presence of thiosulfate or cyanide.

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EPA1

A method for the production of silver nitrate solution without substantial generation of oxides of nitrogen comprises reacting metailic silver with nitric acid and hydrogen peroxide at between 20 and 30% excess hydrogen peroxide over the stoichiometric requirement.

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Thiosulphate as an Alternative to Cyanide for Gold Processing

electrochemical aspects of gold and silver leaching with ammoniacal thiosulphate and compares alternative lixiviants such as cyanide and chloride/hypochlorite. In general, the rate of leaching with M thiosulphate containing 10 mM Cu(II) and M NH3 was similar to the rate with air saturated 5 mM

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THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION .

thiosulphate complex), it can yield substantially better recovery than cyanide. • The thiosulphate leaching of gold ores has great potential to reduce the impact on the environment compared to the cyanidation process. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulphate leaching process are benign, and

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Silver leaching with the nitrite–copper novel system: A ...

Nitritecopper is a totally new and promising silver leaching system. • NO 2 –Cu 2 + system is capable of complexing silver metal without thiosulfate.. Nitrite ions act as a complexing as well as oxidizing agent. • Leaching is controlled by chemical reaction of lixiviant at the Ag surface.

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