extracted gold from ore by the thiosulfat

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.

Gold Extraction in Carbonaceous Ore using Thiosulfate

increasing gold extraction to allow for direct comparison with thiosulfate consumption. It is immediately apparent that under the proper conditions thiosulfate is a much better lixiviant for extracting gold from this carbonaceous ore than cyanide.

Extraction of Gold and Copper from a Gold Ore Thiosulfate ...

The extraction of gold from thiosulfate solutions with amine oxide and its mixture with amines has been studied, the results show that the amine oxide (TRAO) has a higher extraction ability for ...

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.

Gold extraction - Wikipedia

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 ...

Gold Extraction - an overview | ScienceDirect Topics

The effect of pH value on gold extraction for various ore types is shown in Figure 28.4.Greatly increasing pH value has a beneficial effect on gold extraction for both oxide and sulfide ores and stabilizes ∼pH 9.5–10.0, whereas for some carbonaceous ores, pH value has no apparent effect.

Effect of additives on thiosulfate leaching of a gold ore

of thiosulfate and gold thiosulfate is a problem in natural ores where amorphous silica and iron oxide are present. Because of this, the use of surfactants to manipulate the mineral particle surface properties to reduce the catalytic decomposition of thiosulfate and gold thiosulfate is necessary. In addition, the

Gold Extraction and Recovery Processes

available for the extraction of gold metal from its ores. Amongst these methods, cyanidation is the most common method used in the leaching of gold from the ore. This process involves the dissolution of gold containing ores in dilute cyanide solution in the presence of lime and oxygen. For refractory ores such as

Gold has been extracted from carbonaceous ore by using ...

Jan 24, 2019· Gold has been extracted from carbonaceous ore by using cyanide, a chemical which is highly toxic to organisms, since 1887. Conversely, a less toxic method to extract gold from carbonaceous ores was researched and developed, utilising knowledge from the 1970s and further refining the information to achieve the desired outcome. This new method uses thiosulfate, […]

The treatment of copper–gold ores by ammonium thiosulfate ...

The application of ammonium thiosulfate for the treatment of copper–gold ores has been investigated. Copper minerals and copper–gold samples were leached in an ammonium thiosulfate solution under varying experimental conditions, i.e. aeration, temperature and reagent addition.

Cited by: 114Gold has been extracted from carbonaceous ore by using ...

Jan 24, 2019· Gold has been extracted from carbonaceous ore by using cyanide, a chemical which is highly toxic to organisms, since 1887. Conversely, a less toxic method to extract gold from carbonaceous ores was researched and developed, utilising knowledge from the 1970s and further refining the information to achieve the desired outcome. This new method uses thiosulfate, […]

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 …

Effect of inorganic additives on gold thiosulfate leaching ...

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/liquid ratio and o0.05 to 0.2 5M thiosulfate at40 to 60 C and pH 7 to 10Air was injected at the . flowrate of 0.1 L/min/L slurry, and Cu2+, as copper sulfate, was added as the oxidant.

CN101760628B - Thiosulfate gold extracting method taking ...

The invention provides a thiosulfate gold extracting method taking diethylenetriamine as an additive, which is characgerized by comprising the following steps of: adding 0.03-3 mol/dm<3> of thiosulfate leaching agents to ore pulp which is subjected to wet grinding and has the mass concentration of 40 percent by water volume; then adding a diethylenetriamine and copper (II) coordination ion ...

GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING ...

leaching in the ammoniacal thiosulfate solution. Gold leaching drastically decreased as the concentration of copper(II) increased 0.2 mM due to the degradation of S 2 O 3 2-. Keywords: gold, extraction, leaching, thiosulfate, Saudi ore Introduction Gold dissolution in an alkaline cyanide solution was first reported by Elsner in 1846.

Published in: Physicochemical Problems of Mineral Processing · 2015Authors: Mohamed H H Mahmoud · Hesham M Awad · Osman ElhabibAbout: Thiosulfate · LeachingGold and silver extraction by ammoniacal thiosulfate ...

title = "Gold and silver extraction by ammoniacal thiosulfate leaching from a rhyolite ore", abstract = "An investigation has been carried out to identify the parameters of importance in the dissolution of gold and silver values from an ore using ammoniacal thiosulfate solutions containing copper.

thiosulfate leaching - Gold Refining Forum

May 19, 2011· out if Thiosulfate is a viable process for extracting gold. I would like to hear the facts,from someone that has used it in a real mining situation.Bits and pieces of information are what is dangerous with any process. I have edited this to include some information that may help the forum members in the future, and one in particular.

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.

Improvement of thiosulfate stability in gold leaching ...

To leach a mild-refractory copper-bearing gold ore, the authors used a reagent combination of 0.3M (NH 4) 2 S 2 O 3, 0.03M CuSO 4 and 3M NH 3 at pH 10.2 for 24 hours. In the testing, thiosulfate consumption was 30 kg/t of ore. Dissolved oxygen and copper species were found to be responsible for the rapid decomposition of thiosulfate.

Barrick Thiosulfate Leaching of Double Refractory Ore

refractory ore. Double refractory ore is comprised of sulfidic and carbonaceous materials. The use of thiosulfate solution combats the preg-robbing process caused by cyanide treatment on double refractory ores. The thiosulfate forms a complex with the gold that is not absorbed by the carbonaceous material as shown in Eq. 6.

Thiosulfate Leaching Gold Process

Gold cyanidation (also known as the cyanide process or the MacArthurForrest process) is a hydrometallurgical technique for extracting gold from lowgrade ore by converting the gold to a watersoluble coordination complex. It is the most commonly used leaching process for gold extraction…

Production of Gold - West Virginia University

of high-grade ore per year for 8 years. The deposit contains 0.12 ounces of gold per ton of high-grade ore and can be acquired at a cost of $10 per ton of ore (cost of mining ore at site). A sodium cyanide process is used to extract the gold from the ore, and various other processing techniques are used to produce 99.9% pure gold bullion from ...

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.

Extracting gold without cyanide - Chemical Engineering ...

Oct 01, 2018· The first gold using a process without cyanide and without mercury has been produced using technology from CSIRO Minerals Technology (csiro.au) at a demonstration plant in the Western Australian goldfields town of Menzies. Cyanide is used in more than 90% of global gold production, but producers ...

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.

Thiosulfate Leaching Gold Process

Gold cyanidation (also known as the cyanide process or the MacArthurForrest process) is a hydrometallurgical technique for extracting gold from lowgrade ore by converting the gold to a watersoluble coordination complex. It is the most commonly used leaching process for gold extraction…

Production of Gold - West Virginia University

of high-grade ore per year for 8 years. The deposit contains 0.12 ounces of gold per ton of high-grade ore and can be acquired at a cost of $10 per ton of ore (cost of mining ore at site). A sodium cyanide process is used to extract the gold from the ore, and various other processing techniques are used to produce 99.9% pure gold bullion from ...

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.

Extracting gold without cyanide - Chemical Engineering ...

Oct 01, 2018· The first gold using a process without cyanide and without mercury has been produced using technology from CSIRO Minerals Technology (csiro.au) at a demonstration plant in the Western Australian goldfields town of Menzies. Cyanide is used in more than 90% of global gold production, but producers ...

How to Use Bleach on Gold Ore to Remove Gold | Sciencing

Apr 24, 2017· How to Use Bleach on Gold Ore to Remove Gold ... When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from gold ore. This was the first commercial method used for gold extraction. Place the ore into the mortar and grind it to the size of sand stones. Put the ore stones into a plastic bowl.

Thiosulfate leaching of gold—A review, Minerals ...

Feb 01, 2001· Thiosulfate leaching of gold—A review Thiosulfate leaching of gold—A review Aylmore, M.G; Muir, D.M 2001-02-01 00:00:00 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 …

Published in: Minerals Engineering · 2001Authors: Mark G Aylmore · D M MuirAffiliation: Commonwealth Scientific and Industrial Research OrganisationAbout: Lessivage · Copper · Leaching · Thermodynamics · Thiosulfate · Activated carbonPROCESS OF EXTRACTING GOLD AND SILVER FROM ORES …

Feb 16, 2017· According to the patent no. US 2003/0051581, the solubilization of gold in ores is carried out with a solution of 0.1 m ammonium thiosulfate and 0.5 g/l Cu 2+, and extraction of metals gold, silver and copper from the solution is carried out by absorption on ion exchange resins—IRA 93, IRA 400.The concentration of gold in the resin may ...

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 ...

The treatment of copper-gold ores by ammonium thiosulfate ...

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.

Published in: Hydrometallurgy · 2002Authors: Ellen Molleman · David DreisingerAffiliation: University of British ColumbiaAbout: Ion chromatography · Copper · Lessivage · Hydrometallurgy · Leaching · ThiosulfatesGold recovery from refractory gold concentrates by ...

be exposed. Mohammadi et al. investigated ammoniacal thiosulfate leaching of refractory oxide gold ore, and they obtained maximum gold extraction of 55% (Mohammadi et al., 2017). Shen et al. had researched the direct thiosulfate leaching of gold from refractory ore, and they achieved gold recovery of only 70% (Shen et al., 2013).

Gold extraction from thiosulfate solution using ...

Apr 01, 2004· Read "Gold extraction from thiosulfate solution using trioctylmethylammonium chloride, Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Published in: Hydrometallurgy · 2004Authors: Liu Kejun · Wan Tai Yen · Atsushi Shibayama · Toshio Miyazaki · Toyohisa FujitaAffiliation: Akita University · Queen S University · University of TokyoAbout: Ammonia · Trioctylmethylammonium chloride · Reagent · Concentration effect · Thios…The role of ligands and oxidants in thiosulfate leaching ...

The widely used cyanidation technology is not applicable to some gold ores due to economic or technical reasons when the cyanidation gives very low gold extractions. Despite the fact that the gold mining industry accounts for only 13% of total cyanide consumption there is growing public concern over the use of toxic cyanide for gold extraction.

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 ...