sodium thiosulfate use for gold leaching

sodium thiosulfate use for gold leaching

Sodium Thiosulphate Gold Leaching

2016-6-2  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.

Leach Gold using Hyposulphite Of Sodium AKA

2016-1-11  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

Thiosulfate leaching of gold—A review - ScienceDirect

2001-2-1  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. ... deposit Izu. Buz. Tsyv. Metallurgy, 1960, 2, 6-13.(Russian) (Abstract). Umetsu, Y. and Tosawa, K., Dissolution of gold in ammoniacal sodium thiosulfate ...

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.

THIOSULPHATE LEACHING – AN ALTERNATIVE TO

2016-2-17  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

Method for thiosulfate leaching of precious metal ...

Where gold is the precious metal, thiosulfate leaching techniques have typically relied on the use of copper ions to catalyze and accelerate the oxidation of gold, ammonia to facilitate the formation and stabilization of cupric ammine ions and/or a pH at pH 9 or above to maintain a region of stability where both the cupric ammine and gold ...

GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS

The use of alternative leaching agents (sodium thiosulfate and ammonium thiosulfate) has as its major advantages the low toxicity and rates of extraction of gold close to those when using cyanide. The disadvantage of the process is the great complexity of the reactions involved, where some points of the process are not fully understood, and the ...

US6632264B2 - Gold recovery from thiosulfate

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 ion ...

Gold Sodium Thiosulfate Allergy Facts Answer The Itch

Check all gold-appearing jewelry for a stamp that indicates the purity (1-999 or .1-.999) or the karat (10K, 14K, 18K, 22K, or 24K). Also avoid all gold-plated jewelry. Inform your healthcare providers, including dental providers, that you are allergic to gold sodium thiosulfate. Ask that they use

A Method for Leaching or Dissolving Gold from Ores or ...

2009-1-1  The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using hazardous chemicals such as sodium cyanide or aqua regia. These chemicals represent health and safety risks for workers and a serious threat for the

Use of the System S2o3(2-)-O2 for the Leaching of

On the other hand, the use of sodium thiosulfate as a leaching reagent has a good effect for the recovery of gold and palladium, getting recoveries of 90% and 85 %, respectively. In the case of Platinum, the used reagent has no effect on its recovery. Finally, for the case of silver, a rapid leaching could be appreciated; but after

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

2017-8-28  The complexity of thiosulfate leaching of gold is exemplified in Figure 1 (14). It shows that sulfite, sulfide, sulfate glycine and ethylenediaminetetracetic acid (EDTA) have beneficial effects on gold extraction, compared to standard thiosulfate leaching with 0.03 M copper sulfate, 0.3 M sodium thiosulfate and 3 M ammonia (pH 10.2) in the

Biooxidation‒thiosulfate leaching of refractory gold ...

2019-7-21  The gold leaching efficiency of this biooxidation‒thiosulfate process increased by 25.2% and 56.5% compared with those of direct cyanidation and direct thiosulfate leaching of the concentrate. Biooxidation pretreatment followed by ammoniacal thiosulfate leaching technology is highly suitable for gold extraction from high-sulfur fine-sized ...

Method for thiosulfate leaching of precious metal ...

Where gold is the precious metal, thiosulfate leaching techniques have typically relied on the use of copper ions to catalyze and accelerate the oxidation of gold, ammonia to facilitate the formation and stabilization of cupric ammine ions and/or a pH at pH 9 or above to maintain a region of stability where both the cupric ammine and gold ...

GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS

The use of alternative leaching agents (sodium thiosulfate and ammonium thiosulfate) has as its major advantages the low toxicity and rates of extraction of gold close to those when using cyanide. The disadvantage of the process is the great complexity of the reactions involved, where some points of the process are not fully understood, and the ...

“Surface-enhanced Raman spectroscopy studies of the ...

2013-11-19  Complementary electrochemical and spectroscopic techniques were used to characterize the behavior and composition of the passive layer formed at the gold surface in a thiosulfate electrolyte in the presence of cupric ions. Raman studies of three different cationic (calcium, ammonium, and sodium) thiosulfate leaching solutions revealed that the concentrations of thiosulfate, trithionate ...

(PDF) SULPHIDE PRECIPITATION OF GOLD AND

2016-10-19  Thiosulfate leaching of roasted concentrate resulted in 98% gold and 93% silver recovery after 48 hours.Under the conditions used in this study, reagent consumption was high ranging from 36

The Kinetics of the Disproportionation of Sodium ...

2019-5-25  A review of factors affecting gold leaching in non-ammoniacal thiosulfate solutions including degradation and in-situ generation of thiosulfate. Hydrometallurgy 2018, 178 , 151-175. ... Effects of Sodium Thiosulfate and Sodium Sulfide on the Corrosion Behavior of Carbon Steel in an MDEA-Based CO2 Capture Process.

A review of gold extraction using noncyanide lixiviants ...

Furthermore, the feasibility of using thiosulfate for gold leaching at elevated temperatures and pressures in the absence of copper and ammonia was confirmed using the potential–pH diagram of the Au–S–H 2 O system . 3.2. Electrochemistry and kinetics of gold leaching 3.2.1. Electrochemical dissolution of gold

Gold Sodium Thiosulfate Allergy Facts Answer The Itch

Check all gold-appearing jewelry for a stamp that indicates the purity (1-999 or .1-.999) or the karat (10K, 14K, 18K, 22K, or 24K). Also avoid all gold-plated jewelry. Inform your healthcare providers, including dental providers, that you are allergic to gold sodium thiosulfate. Ask that they use

Investigation into the Use of Electrochemical Extraction ...

2018-12-21  Abstract: This paper studies the possibility of extracting gold by electrochemical leaching through the use of a sodium thiosulfate solution. In this regard, the requirements for environmentally sound technologies play a huge and vital role. Low extraction ratios and metal losses increase the cost of this process significantly and therefore it is

Use of the System S2o3(2-)-O2 for the Leaching of

On the other hand, the use of sodium thiosulfate as a leaching reagent has a good effect for the recovery of gold and palladium, getting recoveries of 90% and 85 %, respectively. In the case of Platinum, the used reagent has no effect on its recovery. Finally, for the case of silver, a rapid leaching could be appreciated; but after

Dissolution of Gold in Ammoniacal

It is known that thiosulfate ions are produced during ammonia pressure leaching of sulfide ores. Therefore, we have considered the use of these thiosulfate ions to extract gold and silver in the leaching residue. The following reaction occurs, when gold dissolves in thiosulfate solutions in the presence of oxygen : [chemical formula] Studies of ...

Method for thiosulfate leaching of precious metal ...

Where gold is the precious metal, thiosulfate leaching techniques have typically relied on the use of copper ions to catalyze and accelerate the oxidation of gold, ammonia to facilitate the formation and stabilization of cupric ammine ions and/or a pH at pH 9 or above to maintain a region of stability where both the cupric ammine and gold ...

GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS

The use of alternative leaching agents (sodium thiosulfate and ammonium thiosulfate) has as its major advantages the low toxicity and rates of extraction of gold close to those when using cyanide. The disadvantage of the process is the great complexity of the reactions involved, where some points of the process are not fully understood, and the ...

Gold recovery from thiosulfate leaching - The

We claim: 1. A process for loading gold onto an ion exchange resin from a gold-bearing thiosulfate solution having an initial tetrathionate concentration, the process comprising: (a) adjusting the pH of the gold-bearing thiosulfate solution for a sufficient period of time to produce a gold-bearing loading solution having a tetrathionate concentration reduced relative to the initial ...

Tunability and stability of gold nanoparticles obtained ...

2012-6-22  The most common methods use sodium citrate, sodium borohydrate, and ascorbic acid and usually produce spherical GNPs. Sodium thiosulfate, as a common reagent, has been used in many applications, such as silver recovery in photographic process and leaching of gold from mines.

The Kinetics of the Disproportionation of Sodium ...

2019-5-25  A review of factors affecting gold leaching in non-ammoniacal thiosulfate solutions including degradation and in-situ generation of thiosulfate. Hydrometallurgy 2018, 178 , 151-175. ... Effects of Sodium Thiosulfate and Sodium Sulfide on the Corrosion Behavior of Carbon Steel in an MDEA-Based CO2 Capture Process.

What are the Cyanide-Free Gold Recovery Methods?

2020-12-23  Many gold mine owners have to study the use of cyanide-free gold recovery methods for production. However, for the established gold cyanidation plants, if the original gold recovery method is changed, there will be huge equipment loss. Many gold cyanidadtion plant owners have begun to look for gold leaching chemicals that can replace sodium ...

Gold Sodium Thiosulfate Allergy Facts Answer The Itch

Check all gold-appearing jewelry for a stamp that indicates the purity (1-999 or .1-.999) or the karat (10K, 14K, 18K, 22K, or 24K). Also avoid all gold-plated jewelry. Inform your healthcare providers, including dental providers, that you are allergic to gold sodium thiosulfate. Ask that they use