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thiourea thiocyanate leaching system for gold

Thiourea–thiocyanate leaching system for gold ScienceDirect

Feb 01, 2011· Research Highlights Initial gold leaching rate of the order of 10 − 9 mol cm − 2 s − 1 was obtained in the mixed thiourea–thiocyanate solution and higher than either lixiviant alone. The synergistic effect was attributed to the formation of mixed ligand complex Au(Tu) 2 SCN. Open circuit potentials show that thiocyanate concentration has a great effect on the leaching process.

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Thiourea–thiocyanate leaching system for gold Request PDF

The leaching of gold in thiourea–thiocyanate solutions has been studied by the rotating-disc technique using ferric sulfate as oxidant. The effects of initial concentrations of ferric, thiourea

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Thiourea Gold Leaching

Table of ContentsAdsorption Gold Thiourea & Cation Exchange ResinThiourea ConcentrationThiourea Consumption during Gold Leaching The use of thiourea, (CS(NH2)2 as a complexing/extracting agent for gold and other precious metals has shown promise for implementation in the mining/metals industry. Laboratory testing of this reagent has indicated that a thiourea process for gold extraction has

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Thiocyanate hydrometallurgy for the recovery of gold

Feb 01, 2012· The effect of thiocyanate concentration on the rate of gold leaching was examined in the thiocyanate concentration range of 0.05–0.2 M. The results are presented in Fig. 2.It is understood from Fig. 2 that the initial rate of gold leaching is quite slow and most interestingly, almost insensitive to thiocyanate concentration (0.05–0.2 M). The rate decreases with an increase in the leaching

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(PDF) Leaching of gold in thiocyanate solutions. Part 1

Sep 17, 2020· The effects of roasting temperature, initial concentrations of thiocyanate, thiourea and ferric as well as pH value, leaching temperature and time on the leaching rate of gold were investigated.

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Thiourea–thiocyanate leaching system for gold

A possible alternative reagent to cyanide for gold leaching is thiocyanate, as fi rst reported by White (1905). However, it was not until 1986 that research on the subject was resumed by Fleming (1986), followed by a thermodynamics study of the thiocyanate system for leaching of gold and silver ores published by Barbosa-Filho and Monhemius (1989).

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Cyanide and Other Lixiviant Leaching Systems for Gold with

Jun 10, 2010· Acid leaching systems (pH ⩾ 3)may contain thiourea, thiocyanate, chlorine, aqua regia, or ferric chloride. Chloride is the ligand in the last three systems and the oxidants include chlorine, ferric chloride, hydrogen peroxide, and nitric acid which produce Au(III) anionic complexes, e.g. [AuClJ".

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Alternative Lixiviants to Cyanide for Leaching Gold Ores

Jan 01, 2016· Iron could be used for gold cementation in thiocyanate solutions where ferric iron is used as an oxidant in thiocyanate gold-leaching systems. The barren thiocyanate solutions left after gold cementation can be recycled back to the leaching step and reused (

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Dual lixiviant leaching process for extraction and

A comprehensive investigation of Au leaching from gold ores with a solution containing thiourea and ammonium thiocyanate was performed. A gold ore A with 18 g/t of Au and 1.15 wt.% of sulfur and another gold ore B with 55.7 g/t of Au and 11.67 wt.% of sulfur were used. The percentages of extracted Au were 57%, 66% and 95% for the leaching

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Thiourea–thiocyanate leaching system for gold

Thiourea–thiocyanate leaching system for gold Free download as PDF File (.pdf), Text File (.txt) or read online for free.

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Iodide—thiocyanate leaching system for gold SpringerLink

The instability of these intermediate species towards hydrolysis is a major drawback of the iron(III)-thiocyanate leaching system, which can be overcome by additions of small amounts of I-and/or I 2. Experiments revealed a synergistic effect of the thiocyanate-iodide mixture on the dissolution of gold.

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Thiocyanate leaching of gold UBC Library Open Collections

This study focused on evaluating sodium thiocyanate as an alternative reagent to the conventional cyanidation process for leaching of gold ores. Goldcorp’s Coffee project in Yukon-Canada supplied three mineral samples namely, Supremo Oxide 68151, Supremo oxide 68151, Supremo Composite 72142 for this study. As a baseline for comparison with thiocyanate extraction results, cyanidation tests

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Metals leaching from waste printed circuit boards. Part II

The leaching of gold in thiourea–thiocyanate solutions has been studied by the rotating-disc technique using ferric sulfate as oxidant. lixiviant system. The gold leaching rate in the mixed

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gold leaching thiocyanate whipped-cakes

Thiourea–thiocyanate leaching system for gold . Feb 01 2011 · The leaching of gold in thioureathiocyanate solutions has been studied by the rotating-disc technique using ferric sulfate as oxidant. The effects of initial concentrations of ferric thiourea (Tu) and thiocyanate as well as temperature and pH on gold leaching rates were studied.

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Cyanide and Other Lixiviant Leaching Systems for Gold with

Jun 10, 2010· Acid leaching systems (pH ⩾ 3)may contain thiourea, thiocyanate, chlorine, aqua regia, or ferric chloride. Chloride is the ligand in the last three systems and the oxidants include chlorine, ferric chloride, hydrogen peroxide, and nitric acid which produce Au(III) anionic complexes, e.g. [AuClJ".

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A REVIEW OF GOLD LEACHING IN ACID THIOUREA SOLUTIONS

Aug 31, 2006· Since the initial report of thiourea as a complexing reagent for gold leaching, considerable research has been directed toward the use of thiourea as an alternative to cyanide for gold extraction from different auriferous mineral resources. At the same time, some fundamental investigations of the system have been reported.

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Dual lixiviant leaching process for extraction and

A comprehensive investigation of Au leaching from gold ores with a solution containing thiourea and ammonium thiocyanate was performed. A gold ore A with 18 g/t of Au and 1.15 wt.% of sulfur and another gold ore B with 55.7 g/t of Au and 11.67 wt.% of sulfur were used. The percentages of extracted Au were 57%, 66% and 95% for the leaching

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Thiourea H2NCSNH2 PubChem

Thiourea, also known as thiocarbamid or aminothioamide, belongs to the class of organic compounds known as thioureas. These are organic compounds containing the thiourea functional group, a derivative of urea with the general structure (R1(N)R2C(=S)(R3)R4, R1-R4=H, alkyl, aryl), obtained by replacing the carbonyl group of urea with a thiocarbonyl group.

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IH 2010-001 Reply Impacts of Gold Extraction in the EU

6 European Commission EUROSTAT Information Hub Impacts of Gold Extraction in the EU April 2010 1. 1. 2. TERMINOLOGY • Cyanide is hydrocyanic acid, or any of its salts or derivatives • Leaching is a widely used extractive metallurgy technique which converts metals into soluble salts in

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Gold Leaching Using Thiourea from Uranium Tailing Material

The objective of this study was to investigate thiourea leaching of gold present in the uranium tailings. Sulfuric acid treatment for raw material is important in order to dissolve uranium as well as to remove easily leachable metals. The acidic thiourea solution was proposed as a non-toxic possible alternative process route to cyanide in gold dissolution. The acidic system of thiourea-sodium

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DISSOLUTION OF GOLD WITH CYANIDE REPLACING REAGENTS

Thiocyanate Thiourea Cyanide Ammonium thiosulfate Bisulfide Iodide Ammonia Bromide Hypochlorite Fig. 1. Potential-pH diagram showing typical operating windows for gold lixiviants (after Aylmore, 2005) In leaching of gold a complexing ligand and oxidant are needed. Dissolution of gold in cyanide solution is shown in Eq. 1.

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