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2010121 · The leaching of gold from the pyrite concentrate was the lowest in the sodium thiosulphate solution. This is in accordance with the observation in the pure gold leaching system. Similarly, the gold extraction rates increased at higher concentrations of different thiosulphate salts (Fig. 5). Download : Download full-size image; Fig. 5.
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202211 · The “polycyano” could not dissociate to form free cyanide anions (CN –) in alkaline solutions but still played a similar role as the CN – in leaching gold (Eq. (3)) (Li et al., 2018, Liu et al., 2018b, Yin and Miao, 2019), which explains why its toxicity is much lower than that of cyanide.
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2001126 · as the metal is leached, and this decrease can be related to of compressed air. To demonstrate this effect, the gold/silver the dissolution rate through Eq. [2]: leaching kinetics were measured under varying levels of dissolved oxygen. These levels were simply achieved by r 5 1 MA dm dt [2] either increasing the partial pressure of oxygen to 1 ...
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201811 · Gold dissolution was investigated in ferric chloride solution, being one alternative cyanide-free leaching media of increasing interest. The effect of process variables ( [Fe3+] = 0.02–1.0 M, [Cl−] = 2–5 M, pH = 0–1.0, T = 25–95 °C) on reaction mechanism and kinetics were studied electrochemically using rotating disk electrode with ...
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The goal of the work is to test the leaching of gold in the gold-bearing scraps in hydrochloric acid solutions saturated by chlorine gas in situ-generated. 2 Experimental Figure 1: Reaction temperature effect on the gold leaching. The gold scraps provided from jewellers are first sieved at 187.5 µm average particle size to use in the experiments.
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20211210 · 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 the …
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Global warming potential (GWP), in units of kg CO 2 eq.; terrestrial acidification potential (TAP), in units of kg SO 2 eq.; and water consumption ... After gold leaching and recovery from solution, a metal powder is obtained that is analogous to the anode slime recovered during the pyrometallurgical process. Purification of the anode slime ...
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201661 · Kinetics plot of gold leaching in 25 g L −1 sulfide, and 25 g L −1 polysulfide solution at 50 °C. As the leach rate was relatively low (1.9 × 10 −5 mol m −2 s −1) compared to the cyanidation process, further studies were conducted using 50 g L −1, while the polysulfide concentration was kept constant at 25 g L −1.
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201231 · Gold leaching in thiosulphate media has attracted renewed interest of many researchers over the last three decades due to fast kinetics in the presence of some oxidants/ligands and its adaptability to gold ores which are unsuitable for direct cyanidation. The acidity (pH) and the concentrations of copper(II), ammonia, thiosulphate and …
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2020121 · Using only lime as a pH modifier was tested and it was found the gold recovery was 81.4% compared with 85.1% using a dual (caustic-lime) pH modifier. The lime consumption during the lime-only test was 12.6 kg/t. The lower gold recovery with high lime use may be attributed to the precipitation of calcium oxalate (Eq. 10) on the gold surface. …
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