how to make thiosulfate leaching of gold

MINING

Cyanide alternative leaching reagents for gold recovery

an efficient gold recovery via thiosulfate leaching requires a strict process control which is hardly manageable when a complex input material like crushed e-waste is used. In superficial leaching ex-periments of holistic RAM’s a formation of a passive layer was observed which hindered or slowed

Method for thiosulfate leaching of precious metal

Li J. et al.; “Important Solution Chemistry Factors That Influence the Copper-Catalyzed Ammonium Thiosulfate Leaching of Gold” Presented at the 125th SME Annual Meeting held in Phoenix Arizona Mar. 11-14 1996 pp. 1-20. Li J. et al.; “Copper Catalyzed Ammoniacal Thiosulfate Leaching of Gold and Silver—Solution Chemistry” 34 pages.

Non-cyanide gold leaching agent The Nile Co. Ltd.

Non-cyanide gold leaching agent also can be called Non-cyanide gold dressing agent or Non-cyanide gold dissolving agent is mainly applicable to heap leaching tank leaching and carbon paste agitation leaching processes of fine grind gold and silver ore.

PDF Ammoniacal thiosulphate leaching of gold ore

effect of ammonia effect of cupric ions and few other variables affecting the gold leaching have been studied. The ammoniacal thiosulphate leaching of gold is dependant on both ammonia and thiosulphate concentration. The leaching is improved significantly at a particular ratio of ammonia to thiosulphate

US6632264B2 - Gold recovery from thiosulfate leaching

Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper alyzed 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 Extraction of Gold from E-waste by Hydrometallurgy

In other words less than 2 % of the gold remained in the gold leach solution. Then the organic phase which is charged with 2 M ammonium hydroxide solution and 0.5 M sodium thiosulfate was transferred. The results were not positive and 3.13 and 15.26 % of gold was transferred from organic to …

Thiosulphate Stability In Gold Leaching Process

Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide. The current problem of thiosulphate gold leaching is the high reagent consumption To understand the decomposition chemistry of thiosulphate solution stability tests were conducted in open and sealed vessek mder ambient temperature

How to Improve the Effect of Gold Cyanide Leaching?-prm

Physical mineral processing method: Refueling and floating gold ore when the carbon content is high; When the carbon content is low adding the moderate organic matter such as kerosene or coal tar before the leaching according to the hydrophobicity of carbon mineral surface which can make the carbon mineral surface form a layer that inhibits the adsorption of dissolved gold weaken the

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.Cited by: 69

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

PDF THIOSULPHATE LEACHING – AN ALTERNATIVE TO …

The leach process involves a chemical reaction between metallic gold and the thiosulphate anion with oxygen as the oxidant and ammonium and copper ions as unconsumed alysts in the reaction. One possible scheme for the overall reaction is presented below: 4Au 8S. 2. O.

Improved thiosulfate leaching of a refractory gold

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 72.7% and high thiosulfate consumption 42.4% .

Leaching and recovery of gold using ammoniacal …

A review is presented summarising the leaching of gold with ammoniacal thiosulfate solutions and evaluating the current use and development of ion exchange resins for the recovery of gold and silver from such leach liquors. Comparisons are also made with other recovery processes including carbon adsorption solvent extraction electrowinning and precipitation.

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

How gold is extracted by Cyanidation Process - Refresh …

6/17/2020& 0183;& 32;The removal of silver from its ores also uses the sodium cyanide process just like gold. Gold Leaching. Leaching is used in situations where gold cannot be concentrated for smelting. The most common process used in the cyanide process. However a type of leaching known as thiosulfate leaching is the best on gold ores with highly soluble copper

FUNDAMENTAL ASPECTS OF GOLD LEACHING IN THIOSULFATE

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

how to leach gold with sodium thiosulfate? Yahoo …

9/4/2011& 0183;& 32;I have a few pieces of computer parts that I would like to extract the gold from. I heard that you can leach it out with sodium thiosulfate which makes a strong complex of gold ions to make Au S2O3 2 3−. Is there a way you can get it out of this form? P.S. I know there is a way because it is used in gold leaching as an alternative to cyanide in mining operations.

GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF …

In the sodium thiosulfate and ammonium thiosulfate tests it was possible to extract 70 and 75% of the gold contained in the PCB respectively using solutions containing 0.12 M of sodium or ammonium thiosulfate 0.2 M of ammonium and 20 mM of copper sulfate in 4 hours of leaching at a temperature of 30 2 C and pH 10.

How gold is extracted by Cyanidation Process - Refresh …

The removal of silver from its ores also uses the sodium cyanide process just like gold. Gold Leaching. Leaching is used in situations where gold cannot be concentrated for smelting. The most common process used in the cyanide process. However a type of leaching known as thiosulfate leaching is the best on gold ores with highly soluble copper

How to Improve the Effect of Gold Cyanide Leaching? - …

Its purpose is to expose the gold fully and improve the rate of gold cyanide leaching. 5. The gold and copper are recycled together. In order to make full use of the mineral resources on the premise of comprehensive recovery the different gold leaching methods can be considered to adopt when the fine powder is a gold-copper fine powder. Solution:

A Review of Thiosulfate Leaching of Gold: Focus on

The total reaction of thiosulfate leaching of pure gold is indi ed in Equation 1 and the values of standard Gibbs free energy for Equations 1 – 13 were all calculated based on the

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 hodic polarization and leaching experiments were included in this study. The effect of concentration of different reagents applied potential pH temperature and electrode rotating

WO2005017215A1 - Improved thiosulphate leach process

Gold powder prepared by reduction precipitation from a AuCI "solution was leached using an oxygenated sodium thiosulphate solution 0.1 mole/L containing thiourea 0.01 …

How many steps are there from Seven Trust ore to gold ingot in …

IV Stirring leaching and countercurrent carbon adsorption The characteristic of the carbon leaching method is that the gold leaching and adsorption operations are carried out at the same time and the number of leaching stages is generally 6-10 stages the size and number of leaching tanks are determined by the processing capacity of the processing plant .

how to prepare sodium gold thiosulphate ? - Gold Refining

Jul 27 2012& 0183;& 32;Sodium thiosulfate will leach gold dissolve gold in the use of sodium thiosulfate to leach ore they use air or oxygen many times ammonia is added many time’s copper is used as a alyst for the reaction keeping the pH regulated is also important for the leach to work.

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how to make thiosulfate leaching of gold