LEACHING GOLD BY LOW

1 INTRODUCTION A growing interest has emerged in leach ing gold with thiosulfate solution instead of cyanide dependent methods yielding high gold recoveries without toxicity and at a fast leach ing rate Particulary for sulfide gold ores am moniacal thiosulfate method has some advan tages ofits own 39 Over the past nbsp

thiosulfate leaching of silver from a solid residue after pressure

19 Nov 2014 Noble metals such as silver platinum group metals PGM and gold are recovered from primary and secondary resources by means of leaching The richest sources of these metals being a feed for leaching are noble metals ores by products of nonferrous metals processing anodic slimes from copper nbsp

Thiosulfate Wikipedia

Thiosulfate S 2O2− 3 is an oxyanion of sulfur The prefix thio indicates that the thiosulfate ion is a sulfate ion with one oxygen replaced by sulfur Thiosulfate has a tetrahedral molecular shape with C3v symmetry Thiosulfate occurs naturally and is produced by certain biochemical processes It rapidly dechlorinates water nbsp

Gold Ore Processing Volume 15 2nd Edition Elsevier

Thiosulfate as an Alternative Lixiviant to Cyanide for Gold Ores 1 Introduction 2 Thiosulfate Leaching Chemistry 3 Copper Ammoniacal Thiosulfate System 4 Influence of Mineralogy on Thiosulfate Leaching 5 Impact of Certain Cations and Anions Species on Precious Metal Dissolution and Thiosulfate Degradation 6

The treatment of copper–gold ores by ammonium thiosulfate leaching

Ammonium thiosulfate is particularly attractive as an alternative to cyanide for the treatment of copper–gold ores The presence of copper is desirable in a thiosulfate leach whereas it is detrimental in a cyanide leach Moreover it might be possible to recover both gold and copper provided enough lixiviant and economical nbsp

The leaching of gold silver and their alloys in alkaline glycine

which is comparable to gold leaching rate after six days in thiosulphate–EDTA or thiosulphate–oxalate systems in the presence of thiourea 0 22–0 25 μmol m2 s In alkaline glycine–hydrogen peroxide solutions it has been found that gold leach rate from gold–silver 50 Ag alloy is about 6 times higher than rate from nbsp

Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching for

On a 100 mass 75 μm of silicate type gold ore containing 16 g t Au and 0 2 mass of Fe and C the nickel catalyzed ammonium thiosulfate solution could extract 95 of gold with the 1 2 kg t ore of ammonium thiosulfate consumption in 24 hours at the most favorable reagent combination of 0 0001 mol dm3 NiSO4 0 05 nbsp

THE TREATMENT OF COPPER GOLD ORES BY Open Collections

The application of ammonium thiosulfate for the treatment of copper gold ores has been investigated Leaching studies were conducted with copper minerals copper minerals with gold addition to solution and copper gold samples of different copper and gold grades The behaviour of thiosulfate tetrathionate and sulfate in nbsp

Sodium Thiosulphate Gold Leaching Mineral

Sodium Thiosulphate Gold Leaching Previous Next The gold industry has been Ammoniacal thiosulphate leaching of gold ore

Adsorption of Copper from an Ammonia Thiosulfate Media Using

The study of copper adsorption on anion exchange resins has to do with the recovery of gold as present in the solutions produced by leaching gold ores in an ammonia thiosulfate media where copper is the main impurity in the system The ammonia thiosulfate system with copper offers high gold leaching rates compared nbsp

use of thiosulfate in gold leaching apcngi org

THIOSULPHATE LEACHING to the experimental design of the sulfuric acid leaching of gold copper ore important chemicals in the gold leaching process is

Leach Gold using Hyposulphite Of Sodium AKA

Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate Gold the treatment of gold or silver ore Hyposulphite Of Sodium AKA Thiosulfate Gold

SGS Australia Thiosulphate Leaching Mining

Thiosulphate leaching provides a less toxic alternative to cyanidation in the recovery of gold from ore SGS can help ensure regulatory compliance and good gold recovery

Gold strike with thiosulphate MINING com

Gold strike with thiosulphate The first gold bar produced with the thiosulphate process 13 400 tons of ore can be processed daily with leaching taking

Thiosulphate Leaching Transportation SGS

Thiosulfate leaching provides a less toxic alternative to cyanidation in the recovery of gold from ore SGS can help ensure regulatory compliance and good gold recovery

GOLD EXTRACTION FROM A COPPER BEARING ORE J Stage

Gold extraction by cyanidation is reduced to less than 30 as the copper content in the ore is higher than 0 3 Cu Thiosulphate leaching process could overcome this problem The effect of the variables on the gold extraction have been investigated Under the optimun leaching conditions 0 4 M thiosulphate 0 2 M nbsp

Patent US6632264 Gold recovery from thiosulfate leaching

14 Oct 2003 Processes for recovering gold from copper gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed The processes include subjecting the gold bearing and copper bearing thiosulfate solution to a pH and or temperature adjustment to nbsp

Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching for

nickel as catalyst on the copper bearing sulfide ore was about 1 5 kg t ore less than that using copper as catalyst Received March 17 2003 Accepted December 1 2003 Keywords ammonium thiosulfate leaching cementation nickel gold 1 Introduction The solubility of gold in a diluted solution of potassium cyanide nbsp

Thiosulfate leaching of gold A review PDF

Thiosulfate leaching of gold The application to different ore types and process options have also been discussed The thiosulfate leaching process it catalysed

The role of ligands and oxidants in thiosulfate leaching of gold

Many researchers have identified that thiosulfate leaching is the most likely alternative to cyanidation due to nontoxicity low cost and other benefits This article describes the current information on stoichiometric relationships equilibria reaction rates and mechanisms related to anodic or chemical oxidation of gold in nbsp

Ammoniacal thiosulfate and sodium cyanide leaching of preg

www elsevier nlrlocaterhydromet Ammoniacal thiosulfate and sodium cyanide leaching of preg robbing Goldstrike ore carbonaceous matter Philip A Schmitz a Saskia Duyvesteynb William P Johnsona Larry Enloe c Jaques McMullend a Department of Geology and Geophysics UniÕersity of Utah Salt Lake City UT nbsp

A Review of Ammoniacal Thiosulfate Leaching of Gold An Update

2 Aug 2016 This literature review provides an update of ammoniacal thiosulfate as a potential lixiviant of gold the history of thiosulfate leaching and recent progress on thiosulfate leaching of gold as well as the production oxidation and stabilization of thiosulfate The leaching results of different types of gold ores nbsp

The treatment of copper–gold ores by

The experiments indicate that aeration is a key control parameter during the leaching of a copper–gold ore in gold ores by ammonium thiosulfate leaching MASc

thiosulfate leach of gold plate YouTube

24 Feb 2014 recovered powders from a sodium thiosulfate leach of gold plated pins if all my experiments can be perfected i will have a safe non toxic process to remov

Recent Advances in the Development of an Alternative to the

A process based on thiosulphate leaching followed by resin in pulp gold extraction has been developed to treat the carbonaceous preg robbing ores of Barrick 39 s Goldstrike orebody in the Carlin Trend of Nevada USA These ores have proven to be amenable to thiosulphate leaching under mild conditions gold leaches nbsp

Thiosulfate Leaching of the Auriferous Ore from Castromil Deposit A

Ammoniacal thiosulfate leaching is one of the most important alternatives to cyanidation In this article some experimental studies carried out in order to assess the feasibility of thiosulfate as a leaching agent for the ore from the unexploited Portuguese gold mine of Castromil It became clear that the process depends on the nbsp

COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING

cyanide for gold leaching These two lixiviants have been compared based on the information available in scientific literature Thiosulphate leaching can be considered as a non toxic process It has its own pros and cons which have been discussed in this work The topics of this work are gold ores and their suitability for nbsp

Thiosulphate Stability In Gold Leaching Process Bibliothèque et

The current problem of thiosulphate gold leaching is the high reagent consumption To understand the decomposition chemistry of thiosulphate solution stability tests were conducted in open and sealed vessek mder ambient temperature and normal pressure conditions A low grade mild refiacto ry copper bearing gold ore

Leaching of Gold DocCopper

Leaching of Gold with Various Lixiviants or Complexing Agents All of these lixiviants have shown promise but the most promising appear to the halides and thiosulfate based on the number of technical articles that have been generated about these lixiviants The purpose of this investigation was to collect and review a nbsp

Leaching of Ovacık gold ore with cyanide thiourea and thiosulphate

In this study leaching kinetics of Ovacık gold ore which is the first project of what is potentially a large new mining industry in Turkey has been investigated and major parameters have been determined using cyanide thiourea and thiosulphate The dissolution of gold is discussed in terms of extraction rates and reagent nbsp

Method for thiosulfate leaching of precious metal containing materials

27 Jun 2006 EP0316094 1989 05 17 Separation process EP0522978 1993 01 13 Biooxidation process for recovery of metal values from sulfur containing ore materials EP1433860 2004 06 30 Process for regenerating thiosulphate from a spent thiosulphate gold leachant GB2180829A 1987 04 08 GB2310424A nbsp

Leaching of Gold from the Waste Mobile Phone Printed Circuit

2 Jan 2012 Thiourea is a non cyanide lixiviant for gold leaching which efficiently recovers gold3 but this is not an economical route for the gold leaching due to its high consumption and cost Thiosulfate leaching to recover gold from ores is known for several decades but extensive researches have been started only for nbsp

Gold leaching in thiosulfate solutions and its environmental effects

Leaching of a selected gold ore using thiosulfate solutions for 24 hours suggested the optimum conditions to leach the ore to be 0 2 – 0 4 M thiosulfate 400 mM NH3 10 20 mM Cu II 30 ºC 300 rpm no air supplied solid liquid ratio 20 and mean particle size of lt 106 μm Finally the study showed that mercury dissolves nbsp

Associated Sulfide Minerals in Thiosulfate Leaching of Gold QSpace

Abstract The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore In the leaching test on the reference gold ore about 93 of gold was extracted

Thiosulfate leaching of gold A review

The ammoniacal thiosulfate leaching process for gold and silver S K and Sohn Y S Extraction of gold from a gold ore by ammonium thiosulphate leaching

thiosulphate leaching – an alternative to cyanidation in gold SGS

Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide Although not as aggressive a leaching agent as cyanide thiosulphate offers several technological advantages including its lower toxicity and greater efficiency with gold deposits associated with preg robbing ores The

Patent US6632264 Gold recovery from

All patents patent applications Abbruzzese C et al Thiosulphate Leaching for Gold Study of the Thiosulphate Leaching of Gold from Carbonaceous Ore and

Thiosulfate leaching of gold A review ResearchGate

Request PDF Thiosulfate leaching The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism thermodynamics thiosulfate stability and gold recovery options The application to different ore types and process options have also been discussed

Going for gold Alternative processing methods Australian Mining

17 Jan 2014 Thiosulfate was chosen for in situ or in place leaching of gold as it is more environmentally friendly than cyanide however its stability and rate of gold recovery is typically not as good as cyanide But when it is used with copper ammonia as an oxidant for treating gravity concentrates the gold leach rate nbsp

SGS Singapore Thiosulphate Leaching

Thiosulfate leaching provides a less toxic alternative to cyanidation in the recovery of gold from ore SGS can help ensure regulatory compliance and good gold recovery

Determination of the potential gold electrowinning from an

5 Oct 2015 The use of thiosulphate in the leaching of gold ores has been widely studied These studies show that the efficiency of thiosulphate as a leaching agent depends on the type of mineral to which gold is associated The results indicated that for some types of gold ores the leaching rates were better than those nbsp

Gold strike with thiosulphate MINING com

19 Jun 2015 As part of the thiosulphate process at Goldstrike gold bearing ore is heated as a thick slurry of ore air water and limestone in large pressure chambers or autoclaves and then pumped into the new 39 resin in leach 39 circuit that takes place inside large stainless steel tanks Within the tanks the slurry interacts nbsp

Recovery of Gold from Thiosulfate Solutions and Pulps with Anion

THIOSULFATE LEACH SOLUTIONS AND PULPS 34 2 1 INTRODUCTION 34 2 2 REDUCTION OF THE GOLD THIOSULFATE COMPLEX 35 2 2 1 Cementation of Gold on Copper Iron Zinc or Aluminium 35 2 2 2 Chemical Reduction 37 2 2 3 Electrowinning 39 2 3 CHEMICAL PRECIPITATION 41 2 4 SOLVENT nbsp

There 39 s a first time for everything Barrick Beyond Borders

13 Apr 2015 In fact it marked the first time any company in the western world had successfully produced gold using thiosulfate Long viewed as a potential alternative to cyanide which is typically used to recover gold that is trapped inside ore thiosulfate is a difficult chemical to master Barrick spent more than two nbsp

SGS China Thiosulphate Leaching Mining

Thiosulfate leaching provides a less toxic alternative to cyanidation in the recovery of gold from ore SGS can help ensure regulatory compliance and good gold recovery

‎ DOC ‎Thiourea Leaching of Gold Imperial Spiral Imperial College London

Cyanide ions CN are the active ingredients in the gold leaching process which dissolve the gold contained in the ore by complexation see below forming a 61 used a mildly refractory gold ore containing pyrite and chalcopyrite to determine the feasibility of thiosulphate as an alternative heap leaching technology

Thiosulfate copper ammonia leaching of pure gold and pressure

of Mineral Processing www minproc pwr wroc pl journal ISSN 1643 1049 print ISSN 2084 4735 online Received July 11 2016 reviewed accepted April 26 2017 Thiosulfate copper ammonia leaching of pure gold and pressure oxidized concentrate Antti Porvali Lotta Rintala Jari Aromaa Tommi Kaartinen Olof nbsp

Gold leaching by organic base polythionates new non toxic and

7 Apr 2014 2002 Matthew 2007 Thiosulfate leaching of gold represents a potentially attractive alternative to a respective cyanation process at least for three types of auriferous ores Firstly in auriferous ores containing an organic carbon material the recovery of gold by thiosulfate leaching is generally significantly nbsp

A Review of Thiosulfate Leaching of Gold Focus on MDPI

15 Jun 2017 a copper bearing gold ore The main reasons for excessive thiosulfate consumption are as follows thiosulfate itself is metastable and easily oxidized by Cu II and furthermore certain associated minerals can accelerate its oxidation 7 14 2 1 Electrochemical Catalytic Mechanism of Thiosulfate Leaching

Sodium Thiosulphate Gold Leaching 911 Metallurgist

17 Mar 2017 The gold industry has been seeking alternative reagents for leaching gold from low grade ores for the past 25 years The cost and transport of cyanide the poor recovery of gold from carbonaceous ores the lack of selectivity of cyanide towards copper minerals and the cost of waste treatment are real factors nbsp

Leaching of gold and silver from printed circuit board of mobile phones

Thus this study investigated the possibilities of extracting gold and silver present in PCB 39 s from mobile phones by leaching with thiosulfate solutions 2 Materials and methods The mobile phones used in this research damaged or obsolete were collected in multi technical assistance shops However only equipment of nbsp

Leaching of Gold Tripod com

Leaching of Gold with Various Lixiviants or Complexing Agents

An Electrochemical and SERS Study of the Gold Thiosulfate

Cyanide is by far the most widely used lixiviant or leaching reagent in use today for extraction of gold from its ores 3 6 However due to recent concerns over its toxicity and environmental impact there has been an increased interest in alternative leaching reagents 3 6 Stable thiosulfate gold complexes have been known nbsp

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