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Sodium thiosulfate (0.01 mol) was then added to the Erlenmeyer flask. Next, the Erlenmeyer flask was placed in a constant temperature water bath with a mechanical stirrer set to 25 °C for leaching at 350 rpm for 12 h. Finally, the leached ore pulp was filtered to obtain the Cu–NH 3 –thiosulfate gold-leaching solution. The obtained …
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The application of pressure oxidation (POX) followed by thiosulfate gold leaching is an efficient method used to extract gold from double refractory gold ores containing both sulfide and carbonaceous matter. This process is expected to result in high gold recovery rates, as it liberates gold from sulfides and eliminates the preg-robbing …
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Thiosulfate leaching has been regarded as a promising alternative to cyanidation, but it still faces the challenge of the recovery of low content of gold from …
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The reason for this is uncertain. It can be seen from Figures 11 and 12 that the effect of pH on the copper-thiosulfate reaction is more dramatic than the effect on the gold leaching reaction. Hence thiosulfate leaching should be carried out at pH values above I 1.4 to minimise the consumption ofthiosulfate. 1080 P.L. Breuer and M. 1.
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Some sedimentary minerals have attractive contents of gold and silver, like a sedimentary exhalative ore available in the eastern of Hidalgo in Mexico. The gold and silver contained represent an interesting opportunity for processing by non-toxic and aggressive leaching reagents like thiosulfate. The preliminary kinetic study indicated that the leaching …
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Numerous non-cyanide leaching lixiviants have been developed, among which thiosulfate is considered the most promising alternative to cyanide due to its non-toxicity, low price, high leaching rate and excellent characteristics in dealing with …
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Thiosulfate is a lixiviant with potential applications for extraction of precious metals with lower environmental impact. As an alternative leaching reagent to cyanide, thiosulfate has promising gold extraction efficiency with much lower risk to operators and the environment. Thiosulfate is often produced at high temperatures via processes utilizing sulfide or …
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Sodium thiosulfate can be used to leach gold from black sand by creating a solution with the black sand and then adding sodium thiosulfate to dissolve the gold.
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sand making machine thiosulfate gold from black sand. on sodium thiosulfate leach for gold. thiosulfate leach of gold plateYouTube. 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 plated objects and .
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15/12/2020 · black sand leaching on thiosulfate Leach compound for gold using sodium thiosulfate on black sand »More detailed. Sodium thiosulfate Wikipedia, the free encyclopedia. There are limited data on this method with few recommendations. in foot baths for prophylaxis of ringworm, and as a topical Sodium thiosulfate is also used: …
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This chapter reviews different leaching methods for gold recovery from mine wastes, including cyanide, thiosulfate, thiourea and halides. It also discusses the …
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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 ...
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The acid-insoluble metal sulfides FeS2, MoS2, and WS2 are chemically attacked by iron(III) hexahydrate ions, generating thiosulfate, which is oxidized to sulfuric acid. Other metal sulfides are attacked by iron(III) ions and by protons, resulting in the formation of elemental sulfur via intermediary …
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The leaching behavior of mercuric sulfide with cuprous-thiosulfate solutions has been investigated with the purpose to leach mercury from mercury-contaminated solid waste. The initial pH, [Cu]/[S 2 O 3 2− ] ratio, and temperature may exhibit significant effect on both the stability of cuprous-thiosulfate solutions and the mercury leaching.
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The influence of cations, including calcium, sodium, and ammonium, on the leaching of a pyrite concentrate has been studied by Feng and Van Deventer [49], and the results showed that calcium thiosulfate and sodium thiosulfate have the best effect on gold leaching and thiosulfate consumption, respectively.
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Learn about the diverse applications and impacts of microbial research in this peer-reviewed journal of ASM.
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This article reviews the thiosulfate leaching of gold, a promising alternative to cyanidation, and discusses the challenges and …
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Elemental mercury was used in all leaching experiments. Hydrochloric acid solution was prepared through dilution, and it was used as the pH adjustment solution in hypochlorite leaching experiments. Thiosulfate solution was prepared by dissolving sodium thiosulfate powder (Alfa Aesar Chemical 99% anhydrous) using de-ionized water.
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The data indicate that thiosulfate, trithionate, tetrathionates, and disulfane-monosulfonic acid are key intermediate sulfur compounds in oxidative pyrite degradation, and a novel (cyclic) leaching mechanism is proposed which basically is indirect. In the case of pyrite bioleaching by Leptospirillum ferrooxidans, an organism without sulfur-oxidizing …
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Leach compound for gold using sodium thiosulfate on black sand? Updated: 6/8/2024. Wiki User. ∙ 16y ago. Study now. See answers (2) Best Answer. Copy.
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Precious metals recovery from secondary sources is a novel alternative since they hold higher contents of several metals than average ores. In this research gold and silver were recovered from Waste Printed Circuit Boards (WPCBs) with the use of ammonia-thiosulfate solutions and the MTA 5011 ion exchange resin.
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Would Sodium Thiosulfate leach be safer faster and eazier . Reply. B. Blacktoadd Active member. Joined Jul 14, 2008 ... Type in Gold from black sand and you will find lots of articles on getting it. I was also told, black sand and Iron is always found around gold, but gold is not always found around black sand. Heating up the sand in …
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Gold leaching using the copper–ethylenediamine–thiosulfate (Cu2+-en-S2O32−) system, which contains copper–ethylenediamine complexes, instead of the use of …
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Thiosulfate is a divalent type 'A' soft ligand, which tends to form more stable complexes with low-spin d 8 {Pd II, Pt II, Au III} and d 10 {Cu I, Ag I, Au I, Hg II} metal ions Livingstone, 1965, Wilkinson, 1987monly, the thiosulfate ion acts as a unidentate ligand via the terminal sulfur atom, establishing strong σ-bonds with a metal ion which …
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The thiosulfate leaching reduces the load onto environment since the chemical reagents used in this process are already used in agriculture. As shown in the literature (Smolyaninov et al. 2012), the gold-thiosulfate complex is eluted by polithionates that are produced with the use of iodine, bromine, and hydrogen peroxide as oxidants. …
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Thiosulfate leaching can be effectively improved by a lot of additives including sulfate, sulfite, chloride, phosphate, EDTA, amino acids, guar Gempolym M47, ... After being polished with a 2000 grid sand paper, washed by acetone twice and rinsed with deionized water, gold foil was suspended in the upper part of pulp by a nylon thread in …
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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. The application to different ore types and process options have also been discussed.
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Thiosulfate is a green gold lixiviant that has promise to replace cyanide at the gold mining industry. Hexaamminecobalt(III) (Co(NH 3) 6 3+) is effective in catalyzing the thiosulfate leaching of gold from ores, but the electrochemical behavior and catalytic leaching mechanisms remain unclear.This paper reports an in-depth investigation into …
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I expect Iron content will have a profound effect on a thiosulfate leach. ... Butcher No problem,I use Thio for leaching ore,and black sand. Once you understand it,the thiosulfate is a fantastic leach. Reply. P. Platdigger Well-known member Supporting Member. Joined Jul 26, 2007 Messages 1,662
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