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Abstract: Arsenopyrite was artificially added into the thiosulfate leaching solution to clarify the role of arsenopyrite on the thiosulfate leaching of gold. The effect of arsenopyrite on the thiosulfate leaching of gold was studied by the thermodynamic calculation, mineral dissolution test, leaching test .
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, nontoxic process to remove gold from gold .
Cyanide is destroyed by sodium thiosulfate or sodium nitrite. An average fatal dose of HCN is about 5060 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.
Associated Sulfide Minerals in Thiosulfate Leaching of Gold: Problems and Solutions by ... Abstract The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ... thiosulfate leaching strategies, satisfactory gold extractions and thiosulfate ...
There has been extensive research on thiosulfate leaching for gold extraction since the –31,34–41) Ammonium thiosulfate leaching process is also applicable for the heap leaching,31) However, there are problems in commercializing the thiosulfate process in the gold milling industry, the problems are the most notably high ...
The gold industry has been seeking alternative reagents for leaching gold from lowgrade 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.
Request PDF on ResearchGate | Extraction of Gold and Copper from a Gold Ore Thiosulfate Leachate by Use of Functionalized Magnetic Nanoparticles | Gold and copper thiosulfate adsorption from an ...
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 .
Sep 04, 2011· 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? I know there is a way because it is used in gold leaching as an alternative to cyanide in mining operations.
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 thiosulfategold complex on a highly basic anion exchanger and by isolation of the highly basic anion exchanger, the sorption being carried out 210 hours after the leaching. Then the ...
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...
Sodium thiosulfate is used in gold mining, water treatment, analytic chemistry, the development of silverbased photographic film and prints, and medicine. The medical uses of sodium thiosulfate include treatment of cyanide poisoning and pityriasis. It is on the World Health Organization''s List .
In thiosulfate gold leaching, Cu2+ ions are commonly used as oxidizing agents, while the thiosulfate ion acts as a ligand forming a soluble gold thiosulfateammonia complex (Aylmore and Muir, 2001). It was suggested that gold leaching in the absence of Cu2+ ions, with an external current acting as a oxidizer, is not possible
Formula and uses of sodiumthiosulphate ... which is the standard technique used in gold cyanidation to separate the gold complex from the ore slurry. Analytical chemistry. Sodium thiosulfate is also used in analytical chemistry. It can, when heated with a sample containing aluminum cation, produce a .
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 M copper sulfate, M sodium thiosulfate and 3 M ammonia (pH ) in the
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.
Processes for recovering gold from coppergold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the goldbearing and copperbearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an .
lurgical gold extraction routes utilize a leaching step to produce a goldbearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolution of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious
Gold leaching was primarily limited by the volume of lixiviant contacting the carbonaceous matter; however, a slight kinetic limitation was observed in ammoniacal thiosulfate leaching at higher flow rates. The percentage of gold leached by sodium cyanide from carbonaceous matter demineralized from autoclaved Goldstrike ore was
Thiosulfate leaching can be considered a nontoxic 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 carbonaceoustype ores.
This process is a nontoxic alternative gold cyanidation. The advantage to ammonium thiosulfate is that the pyrolysis of its silver complexes leaves a residue solely of silver sulfide, in contrast to complexes derived from sodium thiosulfate. Other. Ammonium thiosulfate can be used as a fertilizer.
Nov 09, 2015· i am using sodium cyanide for gold leaching,i know that it is very dangerous and harmful to envoirnment,so i want to know about other chemical which can leach gold and silver i want to know how about thioleaching. Top. ... I have never used the thiosulfate leach, that is why I said I suspect, it was just based on an assumption, of how ...
Keywords: gold, zinc, copper, aluminium, thiosulfate, cementation 1. Introduction Ammonium thiosulfate leaching is an alternative gold extraction method to cyanidation because of its low –7) However, the gold recovery method from the leach solution was not widely studied. In our study of gold leaching,8) an
Jan 30, 2019· Sodium thiosulfate may be used to lessen some of the side effects of cisplatin (a cancer medicine). It is also used with another medicine in the emergency treatment of cyanide poisoning. Sodium thiosulfate is to be administered only by or under the immediate supervision of your doctor.
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