fundamental of thiosulfate leach of gold
fundamental of thiosulfate leach of gold
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fundamental of thiosulfate leach of gold

thiosulfate leaching - Gold Refining Forum

May 19, 2011  This is a perfect example of what I was referring to,we do not know what solution your precipitants came from.If I were to assume that they came from a thio-based solution,then you need to heat your precipitants in clean water,just below a boil,for a couple of minutes,let the powder settle to the bottom,decant(pour off) the clear water,and repeat.After your last decanting,you can proceed with ...

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. However there are also ...

A fundamental study of the alkaline sulfide leaching of gold

gold electrode (m2), and t is the time elapsed (s). Thus, the slope of the kinetic plot is a measure of the leaching rate. It can be seen from Figure 1 that the gold/silver leach rate increases as a function of time, eventually reaching a steady state value after 350s. At steady state, the leaching rate for gold/silver is

THIOSULPHATE LEACHING – AN ALTERNATIVE TO

alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in stirred tank reactors or heaps, the size and type of equipment needed for a thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our

A fundamental study of gold leaching in a thiosulfate ...

Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system in the absence of activated carbon was very slow, with only 2% gold dissolved over 24 h. In contrast, in the presence of activated carbon as an additive the gold leach recovery was dramatically improved to over 95% in the same period.

FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

2.2 Stability of thiosulfate solution 16 2.3 Leaching of gold in thiosulfate system 19 2.4 Research on the kinetics and mechanism 25 2.4.1 Passivation phenomena 25 2.4.2 Kinetics study of gold thiosulfate leaching 27 2.4.3 Mechanism of gold thiosulfate leaching 37 2.5 Additives studies 44 3. EXPERIMENTAL APPROACH 48 3.1 Introduction 48

fundamental of thiosulfate leach of gold

Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper , Gold recovery from thiosulfate leaching , Fundamentals, Technology .... Patent WO2005017215A1 Examples 1 to 4 described the technical details of the improved thiosulfate leaching process and , gold from thiosulfate leach solutions , patents: Kind code ...

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.

Barrick Thiosulfate Leaching of Double Refractory Ore

the Leaching Team to optimize the thiosulfate leaching process for double refractory ores. In addition, the Leaching Team analyzed the thiosulfate leaching process compared to the traditional cyanide process. They found that the profit of the thiosulfate leaching process was similar to that of the traditional cyanide method.

Thiosulfate Leaching Kinetics of Gold in the Presence of ...

The leaching of gold from a gold concentrate calcine using a novel thiosulfate leaching method that utilizes cobalt-ammonia complex as the oxidant in place of the traditional copper-ammonia ...

Thiosulfate leaching of gold—A 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.

Thiosulfate Leaching Kinetics of Gold in the Presence of ...

The leaching of gold from a gold concentrate calcine using a novel thiosulfate leaching method that utilizes cobalt-ammonia complex as the oxidant in place of the traditional copper-ammonia ...

Barrick Thiosulfate Leaching of Double Refractory Ore

the Leaching Team to optimize the thiosulfate leaching process for double refractory ores. In addition, the Leaching Team analyzed the thiosulfate leaching process compared to the traditional cyanide process. They found that the profit of the thiosulfate leaching process was similar to that of the traditional cyanide method.

fundamental of thiosulfate leach of gold

Thiosulfate leaching-resin adsorption recovery, an environmentally friendly process, has been developed to efficiently extract gold from an oxide gold concentrate. 80.5% of gold extraction could be achieved by thiosulfate leaching under the conditions of (NH 4) 2 S 2 O 3 0.2 mol/L, CuSO 4 0.025 mol/L, NH 3 1.5 mol/L and leaching time 8 h, and ...

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.

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.

Fundamental aspects of gold leaching in thiosulfate ...

Title: Fundamental aspects of gold leaching in thiosulfate solutions: Creator: Li, Cheng: Date Issued: 2003: Description: The kinetics and mechanism of gold leaching in the ammonia-thiosulfate-copper (ATS-Cu) system have been studied using the rotating

Thiosulfate leaching kinetics of gold in the presence of ...

This can be attributed to passivation of the gold surface by the products of the copper(II)-thiosulfate reaction. Optimum leach conditions derived from this study are 0.4M ammonia, 0.1M thiosulfate, pH > 11.4, and temperature at 30°C.

COMPARISON OF CYANIDE AND THIOSULPHATE

leach significant quantities of gold without consuming excessive quantities of reagents. Thiosulphate is a more effective lixiviant of preg-robbing and high-copper ores than cyanide because ammoniacal thiosulphate leaching is less sensitive than cyanidation to

Gold recovery from ammonia-thiosulfate leaching solution ...

The general consensus is that the optimum conditions for leaching gold depends on the nature of the ore to be treated. The recovery of gold from thiosulfate will only be maximized through a complete understanding of the chemistry of thiosulfate leaching of gold. 1.2. Recovery of gold from thiosulfate leaching solution

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.

A fundamental study of ferric oxalate for dissolving gold ...

A fundamental study was undertaken of the dissolution of gold using a novel thiosulfate leaching system that utilises ferric oxalate as the oxidant in place of the traditional cupric ammine.

thiosulfate leach of gold plate - YouTube

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

(PDF) Gold dissolution in non-ammoniacal thiosulphate ...

In this article, a comprehensive review of fundamental studies of leaching of gold from different ores in ammonia-free thiosulfate solutions is presented with special emphasis on factors that ...

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.

thiosulfate leach of gold plate - YouTube

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 plated objects and ...

(PDF) Gold dissolution in non-ammoniacal thiosulphate ...

In this article, a comprehensive review of fundamental studies of leaching of gold from different ores in ammonia-free thiosulfate solutions is presented with special emphasis on factors that ...

Fundamental aspects of thiosulfate leaching of silver ...

fundamental aspects of thiosulfate leaching of silver sulfide in the presence of additives by jared luke deutsch b.sc., university of alberta, 2010 a thesis submitted in partial fulfillment of the requirements for the degree of master of applied science in the faculty of graduate studies (materials engineering) the university of british columbia

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...

Non cyanide gold leaching. Test. - YouTube

Nov 15, 2017  Recycle Gold CPU Computer Scrap How to Recover Gold from Chips Gold Recovery Gold Extraction - Duration: 18:55. Precious Metal Recovery 1,087,955 views 18:55

Fundamental aspects of thiosulfate leaching of silver ...

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.

A fundamental study of gold leaching in a thiosulfate ...

Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system in the absence of activated carbon was very slow, with only 2% gold dissolved over 24 h. In contrast, in the presence of activated carbon as an additive the gold leach recovery was dramatically improved to over 95% in the same period.

Fundamentals of thiosulphate leaching of gold and Silver ...

Request PDF Fundamentals of thiosulphate leaching of gold and Silver-Part I Today, the most common (>%90) method preferred for production of gold from ores is cyanide leaching. Cyanide ...

process for thiourea and thiosulphate leaching - Gold ...

Nov 09, 2015  I have only done small experiments with thiosulfate myself. I was able to strip gold plating from pins but had a hard time getting the gold back from solution. I believe that I eventually got some gold back but it was in the form of gold sulfide. It precipitated as a dark brown powder that turned black when it was heated.

Iodide Pressure Oxidation Gold Leaching - Autoclave

The gold plate was suspended in the leach liquor when the experiment was carried out. Leaching solution of 300 ml was used in each experiment and was prepared by dissolving known amounts of reagent grade chemicals in distilled water. Before leaching experiment was conducted, gold plate and leaching solution were placed in the autoclave.

(PDF) Thiosulfate leaching of gold from waste mobile ...

Thiosulfate leaching of gold from waste mobile phones

Thiosulfate leaching kinetics of gold in the ... - DeepDyve

Sep 01, 2000  Thiosulfate leaching kinetics of gold in the presence of copper and ammonia Breuer, P.L.; Jeffrey, M.I. 2000-09-01 00:00:00 In recent years a significant amount of research has focused on thiosulfate as an alternative lixiviant for gold. However few fundamental studies have been undertaken due to the complexity of the solution chemistry.

THE INCREASED ACTIVITY IN THE DEVELOPMENT OF

preferential Cu(I)/Cu(II) couple for copper-ammonia-thiosulfate leach solutions or the Fe(II)/Fe(III) couple for Fe-EDTA-thiosulfate leach solutions. The development of thiosulfate based processes has been hindered by the poor adsorption of the gold thiosulfate complex onto activated carbon and thus does not offer a simple replacement for

Iodide Pressure Oxidation Gold Leaching - Autoclave

The gold plate was suspended in the leach liquor when the experiment was carried out. Leaching solution of 300 ml was used in each experiment and was prepared by dissolving known amounts of reagent grade chemicals in distilled water. Before leaching experiment was conducted, gold plate and leaching solution were placed in the autoclave.

(PDF) Thiosulfate leaching of gold from waste mobile ...

Thiosulfate leaching of gold from waste mobile phones

Thiosulfate leaching kinetics of gold in the ... - DeepDyve

Sep 01, 2000  Thiosulfate leaching kinetics of gold in the presence of copper and ammonia Breuer, P.L.; Jeffrey, M.I. 2000-09-01 00:00:00 In recent years a significant amount of research has focused on thiosulfate as an alternative lixiviant for gold. However few fundamental studies have been undertaken due to the complexity of the solution chemistry.

THE INCREASED ACTIVITY IN THE DEVELOPMENT OF

preferential Cu(I)/Cu(II) couple for copper-ammonia-thiosulfate leach solutions or the Fe(II)/Fe(III) couple for Fe-EDTA-thiosulfate leach solutions. The development of thiosulfate based processes has been hindered by the poor adsorption of the gold thiosulfate complex onto activated carbon and thus does not offer a simple replacement for

A fundamental study of ferric oxalate for dissolving gold ...

Jun 01, 2005  A fundamental study was undertaken of the dissolution of gold using a novel thiosulfate leaching system that utilises ferric oxalate as the oxidant in place of the traditional cupric ammine. The key advantage of the ferric oxalate system is that the thiosulfate consumption is negligible compared to the cupric ammine system. The gold leaching kinetics were measured using the rotating ...

Effect of additives on thiosulfate leaching of a gold ore

Effect of additives on thiosulfate leaching of a gold ore *S.J. Dai, P.C. Li, Q.Q. Wang , D.W. Feng University of Science and Technology, Liaoning, Anshan, China Received August 15, 2017, Revised November 15, 2017 The effect of additives on gold leaching was investigated using ammonium thiosulfate or calcium 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

The role of ligands and oxidants in thiosulfate leaching ...

possible application of iron(III)-EDTA-thiosulfate-thiourea as a leaching agent for gold, to achieve a much higher gold extraction (> 90%) under ambient leaching conditions and neutral solutions (pH 6-7) (35). A fundamental study on the use of iron(III)-oxalate-thiosulfate-thiourea for gold leaching has also been reported (36).

Bisulfide Gold Leaching - fotovoltaicipulizia.it

A fundamental study of the alkaline sulfide leaching of gold. A fundamental study of the alkaline sulfide leaching of gold M.I. Jeffrey1* and C.G Anderson2 1 Department of Chemical Engineering, Monash University, Vic., 3800, Australia 2 The Center for Advanced Mineral and Metallurgical Processing, Montana Tech of the University of Montana, Butte, Montana, 59701, USA

A Review of Ammoniacal Thiosulfate Leaching of Gold: An ...

(2016). A Review of Ammoniacal Thiosulfate Leaching of Gold: An Update Useful for Further Research in Non-cyanide Gold Lixiviants. Mineral Processing and Extractive Metallurgy Review: Vol. 37, No. 6,

Thiosulphate Gold Leaching - Hydrometallurgy: Leaching in ...

Thiosulfate is one of alternative reagents to cyanide; many plants still uses cyanide as the primary reagent for gold leaching even though its side effects to environment are well known. While thiosulfate is a potential option, you do need to look at the mineralogy of the deposit.

Ammonium thiosulfate - Wikipedia

Ammonium thiosulfate (ammonium thiosulphate in British English) is an inorganic compound with the formula (NH 4) 2 S 2 O 3.It is white crystalline solid with ammonia odor, readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether.

Thiosulfate Leaching of Gold a Review - [PDF Document]

Jul 16, 2016  For clarity, the different components in the thiosulfate leaching system are discussed separately. Thiosulfate leaching . In alkaline or near neutral solution of thiosulfate, gold dissolves slowly in the presence of a mild oxidant (White, 1905). The dissolution of the gold can be described as follows where oxygen is the oxidant and thiosulfate the

A review of gold extraction using noncyanide lixiviants ...

Although researchers have extensively investigated the fundamentals of thiosulfate leaching, progress toward its commercial application remains slow because of several main obstacles, which include high thiosulfate consumption, gold passivation, and immature subsequent processing of gold recovered from leached solutions [29 – 30].