sodium thiosulfate gold leaching
Sodium Thiosulphate Gold Leaching - 911 Metallurgist
Mar 17, 2017 ... 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...read more
Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate Gold ...
Mar 19, 2017 ... Thiosulfate Gold Extraction. The fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold ores. The gold will dissolve only in small quantities. According to researchers, if gold leaf is treated for a time with sodium hyposulphite solutions of varying strengths,'...read more
A Review of Thiosulfate Leaching of Gold: Focus on ... - MDPI
Jun 15, 2017 ... including calcium, sodium, and ammonium, on the leaching of a pyrite concentrate has been studied by Feng and Van Deventer , and the results showed that calcium thiosulfate and sodium thiosulfate have the best effect on gold leaching and thiosulfate consumption, respectively. S4O62− + SO32− +...read more
COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING ...
The conventional cyanidation process in gold leaching has been used since 1887. It is currently the main gold leaching process in the world. However, gold cyanidation process has serious environmental risks if an accident occurs in the process because of the toxicity of cyanide. After some serious cyanide accidents some...read more
Patent US6632264 - Gold recovery from thiosulfate leaching ...
Oct 14, 2003 ... 11. The process of claim 10 wherein the eluant comprises about 68 g/L sodium tetrathionate, about 75 g/L ammonium thiosulfate and about 32 g/L of sodium sulfite. 12. A process for recovering gold from a slurry, wherein the slurry comprises a solid ore residue and a gold-bearing thiosulfate leach solution...read more
Patent US6344068 - Process for recovering gold from thiosulfate ...
Feb 5, 2002 ... As an optional measure to minimize reagent loss and minimize reduction in gold recovery through oxidation of thiosulfate to tetrathionate, trithionate, sulfate and other oxidized species, sulfite can be added to the leach slurry in the form of sodium metabisulfite or sulfur dioxide at concentrations in the range...read more
Thiosulphate Stability In Gold Leaching Process - Bibliothèque et ...
extraction capacity. Sulphide minerals were responsible for lower gold extraction and thiosulphate consumptioe The increase of oxlde minerais consumes more thiosulp hate. Roasting the sulphides increases the ...... Cumes. -4-3 9. Figure 4-6 Effect Of Sodium Sulphite Concentrations On Thiosulphate Decornposit ion.read more
Gold leaching by organic base polythionates: new non-toxic and ...
Apr 7, 2014 ... Keywords: Polythionate, Organic base polythionate, Smolyaninov reaction, Gold leaching, Thiosulfate leaching, Cyanide leaching .... pentanthionic acid with acidifying the aqueous solution of sodium thiosulfate and the organic base salt enables us to arrive at some general conclusions (Smolyaninov et al.read more
thiosulphate leaching – an alternative to cyanidation in gold - SGS
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 advantages including its lower toxicity and greater efficiency with gold deposits associated with preg-robbing ores. The.read more
Thiosulfate-copper-ammonia leaching of pure gold and pressure ...
Apr 26, 2017 ... ammonia concentration to values <180 mV vs. SHE, not favourable to gold dissolution. Ratios of NH3:S2O3 = 3 resulted in an initial redox potential of 260 – 280. mV vs. SHE, which were suitable for batch reactor leaching. In the batch reactor experiments, sodium thiosulfate pentahydrate (99%), ammonia.read more
Innovative process for the recovery of gold from mining waste - Cnr
influence of the concentration of ammonia and the concentration of thiosulfate on gold dissolution, using reagent of analytical degrees and distilled water. The leaching solutions consist of sodium thiosulfate (Na2S2O3 · 5H2O), used as active leaching agent, ammonia (NH4OH 30%) - for the control of pH - and copper (II)...read more
There's a first time for everything - Barrick Beyond Borders
Apr 13, 2015 ... One of the first things visitors to the thiosulfate processing area see is 14 new stainless steel tanks, some as high as 55 feet and 50 feet in diameter. This is the new resin-in-leach circuit, a critical component of the thiosulfate process. Gold-bearing ore is pumped here from the autoclaves in the form of a...read more
Associated Sulfide Minerals in Thiosulfate Leaching of Gold - QSpace
thought that thiosulfate leaching might provide an alternative option for the leach of copper-bearing ores, which are not economical in cyanidation. Another fact that has to be considered is that ammonium thiosulfate (US$0.1-0.15/kg) is about. 10 times cheaper than sodium cyanide (US$1.8-2.0/kg) in bulk chemical market.read more
Abstract This paper described the current commonly e-waste gold leaching methods, their advantages and disadvantages, and analyzed research status of e-waste thiosulfate gold leaching. Gold leaching from waste integrated circuit (IC) using the alkaline sodium thiosulfate solution with copper iron was investigated.read more
Adsorption of Copper from an Ammonia-Thiosulfate Media Using ...
Oct 11, 2016 ... Adsorption, Desorption, Copper, Ion Exchange Resin, Ammonia-Thiosulfate. 1. Introduction. The study of copper adsorption on anion exchange resins has to do with the recovery of gold as. (. ) −. 3. 2. 3 2. Au S O present in the solutions produced by leaching gold ores in an ammonia-thiosulfate media...read more
The Study and Application of Hydrometallurgical Gold Leaching in ...
gold leaching process to finding the optimum reaction conditions of melting gold and palladium in each process. Under the optimum condition, the determination amount of gold and palladium in aqua regia—hydrofluoric acid, Sodium thiosulfate, and potassium iodide reaches 2.87g/kg and 8.34 g/kg, 2.39g/kg and 8.12 g/kg,...read more
Fundamental aspects of thiosulfate leaching of ... - Open Collections
The leaching of silver sulfide by cupric-ammonia thiosulfate can occur either by the substitution of cupric or cuprous ...... for 10 mM ammonium thiosulfate (pH=9.5) and 10 mM sodium thiosulfate (pH=7) ........... 60 ..... leach gold and silver (Molleman and Dreisinger, 2002); however thiosulfate quickly degrades to tetrathionate...read more
innovative and sustainable gold extraction method|Eco-Goldex Gold ...
Unlike gold leaching meachanism in sodium cyanide solution that CN- is the only powerful component that attacks (dissolves) gold and forms soluble complex Au(CN)− 2 ion, in Eco-goldex solution, several components , though each individual component is not as strong as CN -, involve gold dissolving process and form...read more
Gold cyanidation - Wikipedia
To prevent the creation of toxic hydrogen cyanide during processing, slaked lime (calcium hydroxide) or soda (sodium hydroxide) is added to the extracting solution to ensure that the acidity during cyanidation is maintained over pH 10.5 - strongly basic. Lead nitrate can improve gold leaching speed and quantity recovered,...read more
Gold leaching in thiosulfate solutions and its environmental effects ...
Nowadays, keeping mining and the environment sustainable is a major concern all over the world. Using toxic chemicals such as cyanide and mercury in the gold leaching process is one of the main factors that need to be considered in terms of the environment. Finding alternative lixiviants is one solution that would...read more
Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate ...
Copper catalyzed ammonium thiosulfate leaching process has been proposed as an alternative gold extraction process to cyanidation. In ... Our previous study has demonstrated that nickel catalyzed ammonium thiosulfate solution for gold extraction has the .... copper sulfate, nickel sulfate and gold sodium thiosulfate salt.read more
An Electrochemical and SERS Study of the Gold-Thiosulfate ...
the behavior and composition of the passive layer formed at the gold-thiosulfate interface in the presence of copper. Raman studies of three different cationic (calcium, ammonium and sodium) thiosulfate leaching solutions showed that the concentrations of sulfate, thiosulfate, trithionate and tetrathionate remained constant.read more
Basement Chemistry for the Prospector - Cyanide Leaching
Cyanide is destroyed by sodium thiosulfate or sodium nitrite. An average fatal dose of HCN is about 50-60 milligrams. Cyanide dissolves both gold and silver from alkaline solution. Cyanide is a very "clean" extraction system, as it does not extract many of the base metals such as iron. This is in contrast to halide extraction,...read more
Adsorption of gold from thiosulfate solutions with chemically ...
Mar 20, 2017 ... (2001) also studied sorption recovery of gold from thiosulfate solutions with a concentration of 9.5–17.9 mgl−1 after leaching of products. The maximum recovery percentage of gold on AC was 16.9%, possibly because of the high anionic charge of the thiosulfate complex and the bulkiness of the thiosulfate...read more
Alternative Gold Leaching Methods - January 2014 (Vol. 83, No. 5 ...
The base chemical normally used is either sodium or ammonium thiosulfate. The ammonium sulfate has the advantage of contributing some of the ammonia needed to stabilize the mixture. The ammonia does not really affect the rate at which gold dissolves, but enhances the functionality of the system by reducing the...read more
based on thiosulphate leaching and resin in pulp
of gold, so it can only be carried out after gold recovery. This is illustrated by the data in Table I, which were obtained by treating a thiosulphate leach liquor with sodium hydrogen sulphide. The intentions had been to reduce tetra and trithionate back to thiosulphate prior to gold recovery by resin in pulp. The results show that...read more
Adsorption of Copper Complexes on Anion Exchange Resin in Non ...
The leaching of copper using thiosulfate reagent as an alternative reagent to cyanide has been investigated since it is almost presented in gold thiosulfate leaching ... Leaching solution 200 ml was prepared, consisting of 20 mM (NH4)S2O3 (ammonium thiosulfate), 5 mM sodium trithionate (Na2S3O6), 2 mM cupric sulphate...read more
Leaching of gold and silver from printed circuit board of mobile ph...
tive reagents for cyanide, such as sodium and ammonium thiosulfate. These reagents. are less harmful to the environment and worker health. The ﬁrst characterization of. gold and silver was performed with aqua regia. The results show 86.26g Au/ton of. PCBs and 123.85g Ag/ton of PCBs. The second characterization was...read more
the alkaline sulfide hydrometallurgical separation, recovery and ...
Hydrometallurgical methods can be employed for treatment of gold, arsenic, antimony, tin and mercury containing materials, ... and sodium thiosulfate (Na. 2. S. 2. O. 3. ) are created along with .... Also the waste alkaline sulfide solutions can be recycled for further gold leaching or further processed with low temperature...read more
Tunability and stability of gold nanoparticles obtained from ...
Jun 22, 2012 ... 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. In the gold-leaching process, sodium thiosulfate works as a complexing agent. The reaction is complicated but can be briefly expressed as the...read more
T-6 leaching ormes [Archive] - Alchemy Forums
There is one more chemical, containing sulfur, that may have a potential to capture ormes. Sodium thiosulfate is already used by industry for gold extraction and it can be found/synthesized fairly easy (http://en.wikipedia.org/wiki/Sodium_thiosulfate). I remember reading somewhere on gold refining forums...read more
Leaching of Gold from the Waste Mobile Phone Printed Circuit ...
It is observed that the gold recovery increases up to 0.1M thiosulfate thereafter on further increase in thiosulfate concentration there is a decrease in the leaching of gold. This indicates that the higher thiosulfate concentration promotes the formation of unfavourable products such...read more
University of Nevada, Reno Barrick Thiosulfate Leaching of Double ...
Barrick requests the Leaching Team to optimize the thiosulfate leaching process for double refractory ores. ... of thiosulfate leaching, 63 weight% of gold was recovered of the original pre-autoclave ore. The goal, always ...... https://www.fishersci.com/shop/products/sodium-thiosulfate-crystalline-usp-fcc-fisher- chemical-3/p-...read more
Sciencemadness Discussion Board - Leaching Gold with Lugol's ...
It is a fairly rich deposit of gold a few millimeters thick on the upper surface of the clay. The method I am attempting is leaching with Lugol's Solution. Reputedly, it is a selective leach and will only dissolve gold, leaving the base metals. Lugol's Solution (iodine, sodium iodide, water) is not the most popular...read more
Leaching and Adsorption of Gold from Waste Printed Circuit Boards ...
Aug 1, 2016 ... The iodine consumption in the processes of gold leaching and gold adsorption was evaluated by a redox titration method which is based on the oxidation of iodide into iodine in the presence of sodium thiosulfate and starch indicator [20, 21]. The redox reaction in the solution can be illustrated as below:.read more
Barrick invests heavily in new processing | nnbw.com
Mar 10, 2014 ... The new process uses tiny resin beads to recover the gold and eliminates the use of cyanide leaching. ... They've honed the process in the lab and in a pilot test plant, but the unique chemistry of using a sodium thiosulfate compound instead of cyanide may pose additional and unforeseeable challenges...read more
Fast and Effective Gold Leaching from a Desulfurized Gold Ore ...
Nov 1, 2013 ... The effects of various leaching conditions for gold extraction from sulfur-containing gold ore using acidic sodium chlorate solution were investigated. The contents of gold and sulfur from the ... Selective Electrochemical Gold Recovery from Leaching Solutions of Thiosulfate. José Adrián Tamayo , Sebastián...read more
on the solubility of gold in copper leach solutions__________________. 19. Abundance of chlorine, bromine, and iodine and ... Solubility of leaf gold in 0.0124 M sodium thiosulfate solu- tions adjusted to various pH .... 6 from gold cyanide, 4 from gold thiocyanate, and 3 from gold thiosulfate. Acidic oxidation of pyritic gold...read more
The role of ligands and oxidants in thiosulfate leaching of gold
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...read more PRE Post:south african gold mining minerals process
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