Electro-Hydrometallurgical Chloride Process For Selective Gold Recovery From Refractory Telluride Gold Ores: A Mini-Pilot Study February 2022 Chemical Engineering Journal 429(5):132283
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Gold is an almost non-reactive metal, but halogens — chlorine, bromine, fluorine and iodine — can dissolve it. Chlorine is the cheapest and lightest product that can achieve this. Bleach is the chemical compound sodium hypochlorite. When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from gold ore. This was the first commercial …
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In this work, leaching of gold from mobile phone PCBs by electro-generated chlorine and enriching the concentration of purified gold solution from the hydrochloric acid …
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Chloride (complexant)–hypochlorite (oxidant) mixtures were also used to selectively leach gold and silver from a chalcopyrite concentrate containing 26% sulphur (Puvvada and Murthy, 2000).As found with most refractory or sulphide concentrates, gold cannot be directly leached by cyanidation (Ximing et al., 1992).These refractory materials have to be pre-treated …
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More than 83 per cent of the world's gold is extracted via cyanidation because of its convenient operation, low cost, and high leaching rate. However, cyanide has a high biological toxicity and poor leaching performance in refractory gold ores (containing copper and carbon) (Nunan et al., 2017, Nwaila et al., 2019).Hence, extensive studies have been conducted on …
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An electrochemical reactor with three electrodes was employed for the leaching experiments on copper using electro-generated chlorine. Fig. 1 shows the schematic diagram of the leaching apparatus used in this study (Kim et al. 2008a).The electrochemical reactor of 20 cm × 10 cm × 10 cm rectangular vessel was divided into two compartments by an anion exchange …
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In a leach solution containing 20 % HCl and 20 g/L NaCl, 97 % of the gold was extracted in 6 hours with 90 kg/t available chlorine and 95 % of the gold was extracted in 18 hours with 45 kg/t available chlorine. For a refractory ore, pretreatment is required in order to expose the gold surface to the leach solution.
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Cyclic voltammetry experiments applied to aqua regia leach solutions from PCBs have demonstrated that pure gold can be electro-deposited directly from solution without interference from the other metal ions present. 95 Gold extraction …
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The chlorine reacts with the gold inside the ore to form gold chloride. Filter the ore and bleach solution to remove all the impurities, such as soil and rock fragments. Collect the …
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Much work has been undertaken to develop alternatives to cyanide leaching. 43,53–55 Thiocyanate has been found to leach gold as [Au ... resulted in 99% gold recovery. 83 An advanced technology for the selective recovery of gold …
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Cooler temperature will keep more chlorine gas in solution, while heat can assist in how fast the reaction proceeds (two-edged sword). bubbling chlorine gas would not form sodium salts and increased acid consumption as would the bleach with its sodium hydroxide component to make it basic and to keep the chlorine gas dissolved in the water.
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Any sulfides present will be digested by the chlorine and the gold will all be leached from them. If there was no free gold visible at the start of the leach then you are looking at a …
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Gold is so widely distributed in nature and is so much desired on account of its value that the metallurgy of gold is not only one of the most fascinating but. ... 15 per cent sodium chloride 100 c.c., potassium bromide 2 grams; 15 per cent sodium chloride 100 c.c., chromic acid 2 grams; 15 per cent sodium chloride 100 c.c., potassium cyanide 2 ...
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The process consisted of a chloridizing roast in a Holt-Dern furnace, followed by a percolation leach with a nearly saturated solution of common salt acidified with sulphuric acid. The silver was recovered by precipitation on detinned scrap iron. ... and this was decomposed into metallic gold and chlorine at temperatures below 300°C. If this ...
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Analysis of leach residue The leach residue obtained from the electro-generated chlorine leaching of waste PCBs sample in the separate reactor with 2.0 mol/L HCl at a current density of 714 A/m2 and 298 K temperature was Fig. 6.
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If you are wanting to carry out an actual chlorine leach on an ore the procedure is as follows. Mill the ore down to around 100# or 150 microns top particle size. You will probably wear out a concrete mixer before you get rock pieces down to this size. ... Any sulfides present will be digested by the chlorine and the gold will all be leached ...
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Recently, an emerging electrodeposition-redox replacement (EDRR) method was demonstrated to provide exceptionally efficient gold recovery from cyanide-free hydrometallurgical solutions. However, the effect of electrode material and its corrosion resistance in this process was overlooked, even though the EDRR process is carried out in extremely corrosive, acidic …
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Leaching pure gold with an acidic sodium hypochlorite solution has been demonstrated to be effective. The initial rate of gold dissolution was extremely rapid. In a …
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In the present study, sustainable recycling of gold from the secondary stream of waste printed circuit boards using brine leaching with electro-Cl2 and solvo-chemical strategies was investigated.
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Gold chloride complexes are less stable compared to bromide; stability being strongly dependent on the solution pH (Aylmore, 2005) and redox potential (Hasab et al., 2013).Gold chloride complexes are known to suffer from re-precipitation upon contact with a reductant such as a sulfidic mineral, metals (Aylmore, 2005), silicates (Mohammafnejad et al., …
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et al., 2016). As gold(I) and/or gold(III) exist as anionic complexes in cyanide, thiosulfate and chloride media (Senanayake, 2005), either phosphorus esters or amine extractants have been employed to separate gold from the other metal ions present in the solution (Alguacil, 2003; Sarkar and Dhadke, 2000). In hydrochloric acid solution, the ...
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i am wondering if anyone tried to do a chlorine leach in a batch type system. we have some micron gold that might require crushing. It seems that there is at least a bit of limestone in this gravel glacier deposit. ... I been reading about ssn leach and will be trrying it soon. gold to day was 1800+ per oz . wow BRYAN IN DENVER COLORADO 303 503 ...
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Chlorine was added over an 8-hr period at the rate of 3,5 lb per ton per hr initially, and decreased to 1.5 lb per ton per hr over the last 2.5 hr. Gold extractions of 89 pct (0.035 oz gold per ton tails) were obtained using 38 lb chlorine per ton.
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In the present study, sustainable recycling of gold from the secondary stream of waste printed circuit boards using brine leaching with electro-Cl 2 and solvo-chemical strategies was investigated. More than 99% of gold was leached in 2.0 mol. L −1 NaCl solution at pH, 1.0; electro-Cl 2 rate, 0.62 mmol min −1; temperature, 50 °C; and time, 75 min.. The kinetic data …
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I have used the SWAN Leach and Iodine Leach. I am now going to use the Chlorine Leach. Make my own chlorine (or Clorox) and adjust the pH to 8.5. I always mesh out my sands and cone and quarter. I then work with one kilo or two pound samples. Zinc can be used when the pH is adjusted back from 8.5. Its not cheap.
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In the 2nd stage gold was mostly leached out (93% recovery, ∼67 mg/L) from the residue of the 1st stage by the electro-generated chlorine in 0.1 mol/L HCl. Gold recovery from the leach liquor by ...
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Treatment of carbonaceous gold ores from north central Nevada with sodium hypochlorite or chlorine, or by electrolytic oxidation resulted in favorable gold recovery by …
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Cyclic voltammograms obtained from the blank solution (175 g/L NaCl and 1.2 g/L Cu) and gold-containing solution (175 g/L NaCl, 1.2 g/L Cu and 100 ppm Au): v ¼ 50 mV/s, E start ¼ 0 mV, E 1 ...
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There is a vast amount of globally underutilized low-grade mine tailings and leach residues, including those from primary processing of gold. In this research, the target is to recover the remaining gold (10.9 g/t) from weathered refractory iron-rich residue that had previously been subject to autoclave oxidation, subsequent cyanidation in a conventional carbon-in-leach (CIL) …
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