how to use sodium thiosulfate to leach gold

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Thiosulphate Leaching 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...

Effect of additives on thiosulfate leaching of a gold ore

In a resin-in-leach system full gold recovery was also achievable with sufficient resin after 24 h leach with 006 M fresh ammonium thiosulfate and 2 mM EDTA at an agitation speed of 250 r/min Key words Gold leaching Thiosulfate Additives Leaching kinetics Thiosulfate stability...

thiosulfate leaching of gold

Oct 29 2019 0183 32 thiosulphate leaching an alternative to cyanidation in gold - sgsthiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide although not as aggressive a leaching agent asusing nickel as a catalyst in ammonium thiosulfate leaching for for extracting gold from the copper bearing sulfide ore a higher ammonia and thiosulfate concentrations...

Improved thiosulfate leaching of a refractory gold

One of the major problems of thiosulfate leaching was the high consumption of thiosulfate In this work additive was used to reduce thiosulfate consumption and simultaneously increase gold leaching Thiosulfate leaching without additive was not effective to treat a refractory gold concentrate calcine with high iron sulfur and arsenic due to its low gold extraction 727 and high...

P H O P Invited Review A review of gold extraction using

thiosulfate produced by this process can be used in certain leaching processes for precious metals Zhou et al 48 pre-pared a mixed solution containing sodium thiosulfate and sodium polysulfide The leaching efficiency of gold using such a sulfur-containing solution is highly dependent on the...

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 circumstanc However there are also...

Study on mechanism of gold leaching by thiourea in the

The linear potential sweep voltammetry and electrochemical methods were used to study the mechanism and kinetics of gold dissolution in thiourea solution in the absence and presence of sodium sulphite The results show that in the absence of sodium sulfite the dissolution rate of gold in thiourea solution is relatively slow and it increases with the increase of the concentration of thiourea...

Thiosulfate leaching of gold

Feb 25 2021 0183 32 Thiosulfate leaching can be considered a non-toxic process the gold dissolution rates can be faster than conventional cyanidation and due to...

US6632264B2

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...

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...

Leaching of gold and silver from printed circuit board of

Leaching of PCB s with sodium thiosulfate and ammonium thiosulfate In this step sodium and ammonium thiosulfate were used to extract gold and silver of whole PCBs In both leachates the effect of adding copper as a catalyst agent and hydrogen peroxide as the oxidizing agent to...

The role of ligands and oxidants in thiosulfate leaching

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 003 M copper sulfate 03 M sodium thiosulfate and 3 M ammonia pH 102 in the...

Optimizing and evaluating the operational factors

In order to find the optimum conditions of gold leaching with the highest rate of extraction gold recovery numerical optimization was carried out using DX software which is demonstrated in figure 7 It was found that the maximum gold recovery could be obtained of approximately 915 with a desirable value of 100 by numerical optimization...

THIOSULFATE LEACHING OF SILVER FROM A SOLID

Thiosulfate leaching is one of the promising alternative to the cyanide leaching method with regard to its low toxicity and high efficiency of ores and concentrates leaching Another benefit of this method is relatively low price of chemical agents used as the leaching medium in the process Briones and Lapidus 1998 Mahmoud 2015...

Thiosulfate

Electrochemical gold leaching experiments were performed in three series that consisted of 10 measurements Table 2 The first two series were carried out using sodium thiosulfate and the third using ammonium thiosulfate Three variables were chosen for factorial analysis temperature 20 30 40 176 C applied potential of the...

Gold adsorption and elution in thiosulfate leaching system

The gold loaded MNPs were easily separated from the solution using an external magnetic field Proposing a novel adsorbent with characteristically easy solid-liquid separation to recover gold from synthetic thiosulfate leaching solutions and gold elution...

Study on Gold Extraction from Thiosulfate

Mar 25 2020 0183 32 thiosulfate used in this test was used to examine its effect on leaching of gold The leaching conditions are as follows the copper ion concentration is selected as 0005mol/L the ethylenediamine concentration is selected as 005mol/ L the pH value is adjusted to about 10 the...

WO2005017215A1

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...

Recovery of gold from solution by reduction

A process as claimed in claim 1 3 or 4 wherein the acidic solution is a leach solution obtained in the final recovery step of the acidified thiourea leaching of gold ore or concentrate in the presence of carbon followed by elution of the carbon by thiosulfate or thiocyanate...

A Method for Leaching or Dissolving Gold from Ores or

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 borosilicate glass and equipped with a condenser was used The gold coupon...

Sodium Thiosulfate Formula Properties Risks and Uses

Sodium thiosulfate is a component used as an alternative leaching agent to cyanide for the extraction of gold However it forms a strong soluble complex with the ions gold I Au S 2 OR 3 2 3-...

Thiosulphate Dropped

Jan 11 2012 0183 32 A little copper sulfate not a lot helps catalyze the ammonium thiosulfate leach With the sodium thiosulfate leach a little bit again not a lot of peroxide followed by aeration bubbling air through the solution helps a lot Don t use peroxide if using...

A novel thiosulfate system for leaching gold without the

The thiosulfate lixiviant system for leaching of gold has been under extensive investigation for nearly two decades and consists of ammonium thiosulfate copper and ammonia...

The modes of gold loss in the calcium thiosulfate leaching

Barrick Gold recently commercialized a unique calcium thiosulfate leaching plant to treat these problematic ores after an autoclave pre-treatment with simultaneous recovery of the dissolved gold-thiosulfate complex onto anion exchange resins Nonetheless this new process can experience unexpected losses in gold from solution...

Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate

Thiosulfate Gold Extraction The fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold or The gold will dissolve only in small quantiti According to researchers if gold leaf is treated for a time with sodium hyposulphite solutions...

Improved thiosulfate leaching of a refractory gold

Feb 01 2015 0183 32 Base on the above the thiosulfate leaching of a refractory gold concentrate calcine with several additives including sodium chloride sodium sulfite CMC CMS sodium carboxymethyl starch and HA sodium humic acid has been studied in this paper to investigate a possible increase in gold extraction and/or decrease in thiosulfate consumption...

What are the Cyanide

The study of gold recovery from primary ore by bromine-sodium bromide solution immersion method shows that the leaching rate of gold reaches 82 after immersion for 15-20 days and chlorine can be used to regenerate bromine Using sodium chloride-bromine to leaching sulfur-containing gold ore calcine the gold recovery rate can reach more than 79...

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 this study The effect of concentration of different reagents applied potential pH temperature and electrode rotating...

Gold recovery from thiosulfate leaching

FIG 1 is a flow sheet illustrating a process for recovering gold from ammonium thiosulfate ATS leach solutions using resin-in-pulp RIP FIG 2 is a flow sheet showing an alternative process for recovering gold from ammonium thiosulfate ATS leach solutions using a resin column DETAILED DESCRIPTION OF THE INVENTION...

Method of gold extraction from sulphide gold

The advantage of this method is used for leaching gold less toxic reagent than cyanide but quite toxic ammonia and sulphur dioxide however this method has the disadvantage that during the processing of hard raw materials gold leaching with thiosulfate and ammonium in the presence of copper allows you to extract the gold by only 60...

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