A fundamental study of gold leaching in a thiosulfate ...
The impact of other parameters on the gold leach rate in a thiosulfate‑oxygen‑copper system was also studied using gold power leaching. It has been found that the presence of copper and the use of an elevated temperature (up to 50 °C) are both beneficial for the leaching.
Thiosulfate leaching of gold - A review | Request PDF
In this article, a comprehensive review of fundamental studies of leaching of gold from different ores in ammonia-free thiosulfate solutions is presented with special emphasis on factors that ...
(PDF) Gold dissolution in non-ammoniacal thiosulphate ...
Gold dissolution in non-ammoniacal thiosulphate solutions: comparison of fundamentals and leaching studies ... of gold using ammoniacal thiosulfate leach liquors (a review) ... lixiviant for gold ...
A fundamental study of the alkaline sulfide leaching of gold
A fundamental study of the alkaline sulfide leaching of gold ... It can be seen from Figure 1 that the gold/silver leach rate increases as a function of time, ... standard potentials for the oxidation of gold to gold thiosulfate and gold sulfide are 0.15V and –0.46V respectively (Hiskey and Atluri, 1986). ...
Fundamental aspects of gold leaching in thiosulfate solutions
The effect of concentration of different reagents, applied potential, pH, temperature, and electrode rotating velocity on the gold leaching rate have been investigated. The effect of solution copper species on the anodic reaction of gold dissolution in thiosulfate solution was elucidated using the REQCM.
Associated Sulfide Minerals in Thiosulfate Leaching of ...
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 ... Fundamental principles required for plotting Eh-pH diagrams.....25 3.1.2. Eh-pH diagram of ...
A fundamental study of gold leaching in a thiosulfate ...
Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system in the absence of activated carbon was very slow, with only 2% gold dissolved over 24 h. In contrast, in the presence of activated carbon as an additive the gold leach recovery was dramatically improved to over 95% in the same period.
Cyanidation carbon in pulp gold extraction process - YouTube
Jan 04, 2018 · Cyanidation machine supply please contact email: [email protected]
A fundamental study of ferric oxalate for dissolving gold ...
Jun 01, 2005 · A fundamental study was undertaken of the dissolution of gold using a novel thiosulfate leaching system that utilises ferric oxalate as the oxidant in place of the traditional cupric ammine. The key advantage of the ferric oxalate system is that the thiosulfate consumption is negligible compared to the cupric ammine system.
Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate ...
Ammonia is required to stabilize the catalyst and modify the pH. The toxicity of ammonia weighted exposure average limit is 35 mg/dm3 .10) However, there are some problems in commercializing the thiosulfate process in the gold milling industry. One of major reasons is the uncertainty in the gold recovery from the leach solution.
Fundamental aspects of thiosulfate leaching of silver ...
fundamental aspects of thiosulfate leaching of silver sulfide in the presence of additives by jared luke deutsch b.sc., university of alberta, 2010 a thesis submitted in partial fulfillment of the requirements for the degree of master of applied science in the faculty of graduate studies (materials engineering) the university of british columbia
A fundamental study of the alkaline sulfide leaching of gold
Thus, the slope of the kinetic plot is a measure of the leaching rate. It can be seen from Figure 1 that the gold/silver leach rate increases as a function of time, eventually reaching a steady state value after 350s. At steady state, the leaching rate for gold/silver is calculated to be 2.3x10-5mol/m2s.
THE INCREASED ACTIVITY IN THE DEVELOPMENT OF …
preferential Cu(I)/Cu(II) couple for copper-ammonia-thiosulfate leach solutions or the Fe(II)/Fe(III) couple for Fe-EDTA-thiosulfate leach solutions. The development of thiosulfate based processes has been hindered by the poor adsorption of the gold thiosulfate complex onto activated carbon and thus does not offer a simple replacement for
Thiosulfate Leaching of Gold from Copper Bearing Ores
Thiosulfate leaching of gold and silver has been known since 1858. In the Patera process, which was used for silver recovery for many years (Lidell 1945), silver was extracted from silver chloride by sodium thiosulfate leaching of chloridizing-roasted ores and concentrates.
US8097227B2 - Method for thiosulfate leaching of precious ...
US8097227B2 US12/683,967 US68396710A US8097227B2 US 8097227 B2 US8097227 B2 US 8097227B2 US 68396710 A US68396710 A US 68396710A US 8097227 B2 US8097227 B2 US 8097227B2 Authority US United States Prior art keywords precious metal thiosulfate calcium leach solution pregnant leach Prior art date 2002-11-15 Legal status (The legal status is an assumption and …
The deportment of mercury during thiosulfate leaching and ...
Nov 01, 2010 · This stone reports on the behavior of mercury and its compounds during the thiosulfate leaching and recovery of gold. Thiosulfate solutions are shown to dissolve Hg0 and Hg2Cl2 to a similar extent as cyanide, but the leaching of HgS is significantly slower in thiosulfate solutions compared to cyanide. Hence, the use of thiosulfate may be an option for treating ores containing high levels of ...
The role of ligands and oxidants in thiosulfate leaching ...
A fundamental study on the use of iron(III)-oxalate-thiosulfate-thiourea for gold leaching has also been reported (36). Figures 1-6 clearly show the complex behaviour of thiosulfate leaching of gold from different ores under different conditions and highlights the importance of fundamental studies for a proper understanding of leaching
sodium thiosulfate | sigmaaldrich.com
Adfor choosing a leading LifeScience, & High Tech Company for your research needs