ore dressing thiosulfate leaching of gold

  • 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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  • Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate

    Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate Solutions and Ion Flotation for Gold Recovery 84 were added up to the iodine solution became colorless. The spent sample volume was measured for determining the amount of thiosulfate that was needed to add into the pulp. Once an experiment finished the pulp was filtered in a press filter.

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  • Ammoniacal thiosulfate and sodium cyanide leaching of

    Gold leaching was primarily limited by the volume of lixiviant contacting the carbonaceous matter; however a slight kinetic limitation was observed in ammoniacal thiosulfate leaching at higher flow rates. The percentage of gold leached by sodium cyanide from carbonaceous matter demineralized from autoclaved Goldstrike ore was

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  • Study on the Gold Leaching Process by Potassium Ferricyanide

    Leaching of middle refractory gold ore show that both of the consumption of thiosulfate and leaching rate was decreased compare to the traditional copperammonia thiosulfate system. Thiourea is not stable in base solution but it was found that gold dissolution rates can be increased with a little thiourea the mechanism is still unclear.

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  • thiosulfate

    May 19 2011· Has anyone here actually used thiosulfate for leaching gold ore and had positive results that can be repeatable as a real leaching process? Has anyone found a real working precipitation process to recover the gold that works well and is dependable? Also getting the gold out of the precipitates seems to be a real pain.

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  • Patents Assigned to Barrick Gold Corporation Justia

    Apr 04 2000· The oxidized ore slurry is mixed with a thiosulfate salt lixiviant which mixture is maintained at a pH between 7 and 8.7 while the slurry is agitated in a stirred tank reactor system having agitated leach tanks. Gold is recovered from the gold bearing leachate by cementation adsorption on an adsorbent or cyanidation.

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  • Thiosulphate Dropped Testing for PM? GOLD REFINING FORUM

    Jan 11 2012· Thus to prepare an acidic thiosulfate leach (pH lower than 7) is impossible. To clear the situation you can do a simple experiment. Take a sample of freshly prepared unused thiosulfate leach solution without leaching an ore sample treat it with ferrous sulfate exactly the same way you did with your test samples and look what happens.

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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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  • A Review of Ammoniacal Thiosulfate Leaching of Gold An

    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 including oxide sulfide

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  • A Method for Leaching or Dissolving Gold from Ores or

    lurgical gold extraction routes utilize a leaching step to produce a gold bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu tion of the precious metal. Therefore A Method for Leaching or Dissolving Gold from Ores or Precious

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  • The effect of solution parameters on the thiosulfate

    In recent years leaching of refractory gold ores has received much attention due to the depletion of oxide ores. Since the gold is usually associated with or encapsulated in sulfide minerals such as pyrite arsenopyrite and chalcopyrite research in this field has focused mainly on these phases. However the main sulfide mineral in Zarshouran gold mine (Iran) is orpiment which has received

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  • Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate

    Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate Solutions and Ion Flotation for Gold Recovery 84 were added up to the iodine solution became colorless. The spent sample volume was measured for determining the amount of thiosulfate that was needed to add into the pulp. Once an experiment finished the pulp was filtered in a press filter.

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  • Thiosulfate leaching of goldA review ScienceDirect

    An alternative approach is to use thiosulfate to leach gold from ores. Thiosulfate is considered a non toxic alternative to cyanide and can leach gold faster than cyanide. In the conventional cyanide process the recovery of gold and silver from ores is hindered by a variety of metal impurities like copper arsenic antimony zinc and nickel

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  • GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING

    thiosulfate leaching of gold (Chen 2008). This shows how much a mineralogical investigation is important to be performed before leaching study of any gold ore by the thiosulfate process. Several gold localities are scattered in the Arabian Shield of the kingdom of Saudi Arabia which has about 20 million tons of recoverable gold ores.

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  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING 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

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  • Barrick Gold Corporation Processing Innovation Nets

    In gold mining terms failing to get it right means that gold recovery rates can be unpredictable and thiosulfate consumption can be very high pushing up costs. However by trialing the process in a demonstration plant for 16 months Barrick's team made gold recovery economically feasible.

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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 contacting with an

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  • Gold recovery from refractory gold concentrates by

    researched the direct thiosulfate leaching of gold from refractory ore and they achieved gold recovery of only 70% (Shen et al. 2013). Li et al. studied the best conditions of roasting and oxidizing refractory gold bearing sulfur concentrates in the muffle furnace and the optimized technological parameters for thiosulfate leaching were

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  • Gold extraction

    Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution mineral processing hydrometallurgical and pyrometallurgical processes to be performed on the ore Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing resulting in direct recovery of

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  • Associated Sulfide Minerals in Thiosulfate Leaching of

    Barrick Thiosulfate Leaching of Double Refractory Ore. refractory ores which contain only sulfides In general the cyanide solution pulls the gold out of the ore and into solution However when the standard cyanide leaching solution is used to recover gold from double refractory ores instead of single refractory ores gold has a strong

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  • Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate

    Thiosulfate Gold Extraction Leach These solutions have very little solving action upon the natural sulphide contained in gold bearing ore and should be suitable solutions for the treatment of gold or silver ore as they have a greater solving power than cyanide of potash are not poisonous and can be obtained in very large quantities at a

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  • A Review of Ammoniacal Thiosulfate Leaching of Gold An

    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 including oxide sulfide

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  • Going for gold Alternative processing methods

    Jan 17 2014· Going for gold Alternative processing methods. Thiosulfate and bromide are used to leach the gold in a similar way to cyanide whilst the alpha cyclodextrin is used in a

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  • A Review on Alternative Gold Recovery Reagents to Cyanide

    Chlorination Aqua Regia Bromine Thiocyanate Thiosulfate and Thiourea leaching.For this pro pose the gold leaching reagents are described and discussed in terms of their environmental and economical points of view. As result of this comparison thiourea stands out as the most promising alternative gold leaching reagent to cya nide. Keywords

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  • Gold cyanidation

    Gold cyanidation (also known as the cyanide process or the MacArthur Forrest process) is a hydrometallurgical technique for extracting gold from low grade ore by converting the gold to a water soluble coordination complex. It is the most commonly used leaching process for gold extraction.

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  • The role of ligands and oxidants in thiosulfate leaching

    The role of ligands and oxidants in thiosulfate leaching of gold Gamini Senanayake A.J. Parker Cooperative Research Centre for Hydrometallurgy Department of Mineral Science and Extractive Metallurgy Murdoch University Perth WA 6150 Australia Abstract The widely used cyanidation technology is not applicable to some gold ores due to economic or

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  • Gold strike with thiosulphate CSIRO

    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 from four million tonnes of stockpiled ore that was uneconomic to process by traditional methods. CSIRO's Danielle Hewitt

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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 contacting with an

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  • Leaching Gold From Concentrates and Black Sands

    Feb 20 2014· TCB International LLC is a Phoenix Arizona based company specializing in the processing of precious metal ores. Our state of the art plant contains an in house laboratory and leaching

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  • Effect of inorganic additives on gold thiosulfate leaching

    method and the gold recovery is lower than expectations often in the range of 40 to 60% Au recovery. The aim of this study was to evaluate the effect of selected inorganic additives on the gold extraction from oxidized ores with thiosulfate leach process. The thiosulfate leaching tests were conducted for 24 h under conditions of 100 g/L solid

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  • Leaching of Gold from the Waste Mobile Phone Printed

    A leaching of 56.7% gold was obtained under the optimum condition of 0.1M ammonium thiosulfate 40 mM copper sulfate pH 10 10.5 pulp density 10 g/L at room temperature and stirring speed of 250 rpm in 8h duration. The maximum leaching of gold in the pH range 10 10.5 may be attributed to the higher stability of the ammonium thiosulfate.

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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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  • Gold leaching by organic base polythionates new non toxic

    The proposed method of the gold recovery comprises leaching with a solution of a mixture of sodium and ammonium hydrosulfite and thiosulfate by sorption of the thiosulfate gold complex on a highly basic anion exchanger and by isolation of the highly basic anion exchanger the sorption being carried out 2 10 hours after the leaching. Then the

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  • Gold recovery from refractory gold concentrates by

    researched the direct thiosulfate leaching of gold from refractory ore and they achieved gold recovery of only 70% (Shen et al. 2013). Li et al. studied the best conditions of roasting and oxidizing refractory gold bearing sulfur concentrates in the muffle furnace and the optimized technological parameters for thiosulfate leaching were

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  • Improvement of thiosulfate stability in gold leaching

    Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However the major problem with this leaching method has been the high consumption of reagents. To leach a mild refractory copper bearing gold ore the authors used a reagent combination of 0.3M (NH4)2S2O3 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. In the testing thiosulfate consumption was 30 kg/t of ore.

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  • thiosulfate leach of gold plate

    Feb 24 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 remove gold from gold

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  • Study on the Gold Leaching Process by Potassium Ferricyanide

    Leaching of middle refractory gold ore show that both of the consumption of thiosulfate and leaching rate was decreased compare to the traditional copperammonia thiosulfate system. Thiourea is not stable in base solution but it was found that gold dissolution rates can be increased with a little thiourea the mechanism is still unclear.

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  • 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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  • 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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  • ALTA MetBytes What's Happening in Gold Ore Processing

    CSIRO Australia has developed a thiosulfate based reagent system for gold leaching that has excellent stability and shown broad applicability in the laboratory compared to the thiosulfate system commercially implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada USA.

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  • Leaching of Gold from the Waste Mobile Phone Printed

    A leaching of 56.7% gold was obtained under the optimum condition of 0.1M ammonium thiosulfate 40 mM copper sulfate pH 10 10.5 pulp density 10 g/L at room temperature and stirring speed of 250 rpm in 8h duration. The maximum leaching of gold in the pH range 10 10.5 may be attributed to the higher stability of the ammonium thiosulfate.

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  • Improvement of thiosulfate stability in gold leaching

    Ammonium thiosulfate is a noncyanide lixiviant for gold leaching. However the major problem with this leaching method has been the high consumption of reagents. To leach a mild refractory copper bearing gold ore the authors used a reagent combination of 0.3M (NH4)2S2O3 0.03M CuSO4 and 3M NH3 at pH 10.2 for 24 hours. In the testing thiosulfate consumption was 30 kg/t of ore.

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  • Barrick Thiosulfate Leaching of Double Refractory Ore

    the ore but autoclaves cannot; autoclaves can only remove the sulfides. The thiosulfate gold complex formed in thiosulfate leaching is not attracted to carbon so this failure to remove the carbon is no longer an issue. Thus the use of thiosulfate with autoclave processed double

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  • Gold cementation with zinc powder from leaching

    The cementation of gold with powder of zinc from solutions with thiosulphate and ammonia was studied. The variables evaluated were thiosulphate concentration ammonia concentration pH copper

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  • Bioleaching

    Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper zinc lead arsenic antimony nickel molybdenum gold silver and cobalt

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  • Copper catalyzed thiosulfate leaching of low grade gold ores.

    Copper catalyzed thiosulfate leaching is being investigated by the U.S. Bureau of Mines as a potentially economical and environmentally safe method for heap leaching or in situ leaching of low grade oxidized gold ores. Six variables were investigated in fractional factorial screening tests

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  • MAXIMISING THE VALUE OF GOLD DIAGNOSTIC LEACHING

    indication of gold recovery could be obtained by conducting fire assays on head and tails samples. Gold Recovery Gold recoveries from cyanide leaching varied significantly across the samples from this gold ore site and ranged from 9100%. This indicates a variability in the refractory nature of gold in

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  • Ammoniacal thiosulfate leaching of refractory oxide gold ore

    Jul 10 2017· Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X ray fluorescence and fire assay analyses the ore contained about 33.01 wt% Si 8.53 wt% Al 7.26 wt% K 3.00 wt% Fe and 2.80 ppm Au.

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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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  • Gold strike with thiosulphate

    Within the tanks the slurry interacts with thiosulfate and a fine bead like material called resin that collects the gold. At full capacity 13 400 tons of ore can be processed daily with

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