leaching gold with thioaulphate

Associated Sulfide Minerals in Thiosulfate Leaching of

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 within 3 0 hours

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sodium thiosulphate And hypochloride leaching Gold

Jun 14, 2019 Concentrate particle size can present a problem if the particles encapsulate the gold, if the leach cannot contact the gold it cannot leach it Always keep in mind that if you have sulfides present in the ore you have to keep a close eye on the leach pH Litmus papers will work as well as a pH meter for this type of leach

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Gold dissolution in non ammoniacal thiosulphate solutions

Thiosulphate has received much attention as an alternative non cyanide lixiviant for gold recovery over the last three decades In particular, a number of studies have shown that an ammoniacal copperII/thiosulphate system offers fast leaching kinetics, but there are difficulties in controlling the complex solution chemistry and there are concerns over the use of ammonia

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A Review of Ammoniacal Thiosulfate Leaching of Gold: An

The factors affecting gold leaching such as pH, temperature, and oxidants in leaching solutions, reagent concentrations, and foreign ions are presented to update the current understanding on gold dissolution in a CuII NH 3 S 2 O 3 2 system

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Gold Recovery from Kaletaș Turkey Ore by Thiosulphate

In this study, thiosulphate leaching of gold from the refractory Kaletaș ore was evaluated as an alternative to cyanide leaching The extraction of gold in the thiosulphate leaching system was similar to that in cyanide leaching system with the highest gold extraction of 69 6 in thiosulphate medium

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WO2005017215A1 Improved thiosulphate leach process

An improved thiosulphate leach process for the recovery of gold from ores and other gold bearing materials, characterised in that the leach solution comprises thiosulphate, thiourea or a reagent chemically related thereto, and an oxidant that does not oxidise thiosulphate, the process producing a pregnant leach solution from which gold may be recovered

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Thiosulphate Leaching Mining SGS

Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign

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Cyanide free gold recovery CSIRO

Aug 02, 2019 Thiosulphate dissolves the fine gold out of ores the gold that has not recovered by gravity at similar rates to conventional techniques It's safe and lowers environmental impacts The method has undergone intensive testing in the laboratory to understand its leaching performance in association with reagent recovery and recycle

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How to leach gold with sodium thiosulfate Quora

May 27, 2017 Crush your ore to the consistency of fine sand in a rod mill, then transfer it into a large vat with a strong solution of sodium thiosulfate and agitate it with paddles for a day to a week, depending on the size of your vat Finally, filter and di

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Substitution Recovery of Gold from Copper Ethylenediamine

Abstract The substitution method of recovering gold from thiosulfate ethylenediamine en Cu 2+ leaching solution using copper powder was studied The effects of reaction time, stirring speed, pH, thiosulfate concentration, en/Cu 2+ molar ratio, Cu/Au + mass ratio, and temperature on gold recovery were systematically examined The experimental results showed that reaction time,

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Importance of Solution Chemistry for Thiosulphate Leaching

Gold recovery by catalytic copper ammonium thiosulphate solution has been studied Such a process strategy is very attractive for leaching certain difficult to treat ores and presents lessened lixiviant toxicity compared to cyanide Newmont Gold Company has evaluated the ammonium thiosulphate heap leach process for gold recovery from low grade carbonaceous sulphidic refractory ores following

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Thiosulfate leaching of gold A review Request PDF

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

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THIOSULPHATE LEACHING AN ALTERNATIVE TO

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 thiosulphate leaching

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AMMONIACAL THIOSULPHATE LEACHING OF A COPPER

In this study, copper assisted ammoniacal thiosulphate leaching of a copper rich gold ore was studied A cyanide leaching test was also carried out for comparison The experiments were designed using a Taguchi L9 3 3 design for the evaluation of the effects of initial concentrations of thiosulphate, ammonia and copper on gold extraction

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Gold strike with thiosulphate CSIRO

Gold produced with a cyanide free thiosulphate process is adding value to a US gold operation Roger Nicoll reports that the process incorporates patented technology developed through a collaboration between Barrick Gold Corporation and CSIRO

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Fundamental aspects of gold leaching in thiosulfate

The kinetics and mechanism of gold leaching in the ammonia thiosulfate copper ATS Cu system have been studied using the rotating electrochemical quartz crystal microbalance REQCM Anodic polarization, cathodic polarization and leaching experiments were included in

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The study of the kinetics of gold leaching in the ammonium

The gold leaching rate in ammonium thiosulfate in the presence of copper species is mainly controlled by the cathodic process, which is under diffusion or mixed kinetics control The results of the rotating gold disk leaching study are consistent with those from the electrochemical study

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COMPARISON OF CYANIDE AND THIOSULPHATE

cons which have been discussed in this work The topics of this work are gold ores and their suitability for leaching processes, pretreatment of concentrate, leaching chemistry and reagent consumption, leaching kinetics, gold recovery from leaching liquors

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Thiosulfate leaching of goldA review ScienceDirect

Thiosulfate leaching can be considered a non toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous type ores In addition, thiosulfate can be cheaper than cyanide

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US6632264B2 Gold recovery from thiosulfate leaching

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 reduce tetrathionate concentration in the thiosulfate solution prior to

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A Review of Ammoniacal Thiosulfate Leaching of Gold: An

The factors affecting gold leaching such as pH, temperature, and oxidants in leaching solutions, reagent concentrations, and foreign ions are presented to update the current understanding on gold dissolution in a CuII NH 3 S 2 O 3 2 system

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Gold strike with thiosulphate MINING COM

The first gold bar produced with the thiosulphate process was poured in late 2014 at Barricks Goldstrike plant in Nevada, USA and operations are ramping up to recover gold

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Thiosulphate Stability In Gold Leaching Process

Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide 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

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Leaching of gold, silver and accompanying metals from

Acta Montanistica Slovaca Ročník 16 2011, číslo 2, 128 131 128 Leaching of gold, silver and accompanying metals from circuit boards PCBs waste Jana Ficeriová1, Peter Baláž1 and Eberhard Gock2 Au Ag noble metal wastes represent a wide range of waste types and forms, with various accompanying metallic elements

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Gold strike with thiosulphate CSIRO

Gold produced with a cyanide free thiosulphate process is adding value to a US gold operation Roger Nicoll reports that the process incorporates patented technology developed through a collaboration between Barrick Gold Corporation and CSIRO

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Sodium Thiosulphate Gold Leaching

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 which can make cyanide unattractive in some circumstances

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PRETREATMENT PROCESSES IN GOLD RECOVERY BY

gold leaching processing Accordingly, a number of studies have been carried out to develop a useful and economically profitable process for gold leaching by thiosulphate Concentrate pretreatment is necessary in thiosulphate leaching process when gold appears in company with sulphidic or carbonaceous ores They both have the

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Effect of additives on thiosulfate leaching of a gold ore

leaching, but gold was not stable in solution There was an optimum CMC dosage, and beyond this, further addition of CMC hindered gold leaching The surfactant sodium dodecyl sulfate SDS had a similar effect to CMC At an agitation speed of 250 r/min, 100 leach recovery of gold was achieved with 0 03 M fresh ammonium thiosulfate, 2 mM EDTA

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Cyanide free gold recovery CSIRO

Aug 02, 2019 Thiosulphate dissolves the fine gold out of ores the gold that has not recovered by gravity at similar rates to conventional techniques It's safe and lowers environmental impacts The method has undergone intensive testing in the laboratory to understand its leaching performance in association with reagent recovery and recycle

Get Price

Thiosulphate Dropped Testing for PM? Page 2 Gold

Jan 11, 2012 If leaching gold with this thiosulfate leach, and maintaining leach in favorable conditions was like trying to juggle a basket full of rotten tomatoes while standing on your head, then trying to leaching gold from copper metal pins may just upset your balance and you can make something similar to Cambells toe mater soup

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PDF Ammoniacal thiosulphate leaching of gold ore

PDF Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non toxic and environmentally safe as compared to the toxic cyanide system for gold

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Substitution Recovery of Gold from Copper Ethylenediamine

Abstract The substitution method of recovering gold from thiosulfate ethylenediamine en Cu 2+ leaching solution using copper powder was studied The effects of reaction time, stirring speed, pH, thiosulfate concentration, en/Cu 2+ molar ratio, Cu/Au + mass ratio, and temperature on gold recovery were systematically examined The experimental results showed that reaction time, stirring speed

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Thiosulfate leaching of goldA review ScienceDirect

Thiosulfate leaching can be considered a non toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous type ores

Get Price

PDF Ammoniacal thiosulfate leaching of gold from a

Thiosulphate as an alternative to cyanide for gold processingissues and impediments, Mineral Processing and Extractive Metallurgy, 113, 1 11 Senanayake, G , 2005 Gold leaching by thiosulphate solutions: a critical review on copperII thiosulphate oxygen

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