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Apr 08, 2017· A piece of porcelain cup with gilding was placed in a glass, 23 ml of water was added, then 2.5 ml of concentrated sulfuric acid was added and mixed. Then added 1.5 ml of "Whiteness" (sodium ...
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Jan 01, 2015· The gold extraction yield was about 89%. Gold recovery by activated carbon adsorption was about 49.852%. Keywords: gold ore, leaching, hypochlorite-choride, activated carbon 1. Introduction Gold leaching from ores by hydrometallurgy .
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The reactions between gold and hypochlorite leach solutions containing hydrochloric acid and sodium chloride are demonstrated below: 4Au + 16NaOCl + 10H2O → 4HAuCl4 ...
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Initial bisulfide-leaching tests using the YES process attained 25–31% gold extraction from a bio-oxidized Nevada ore compared with 88% by conventional cyanide leaching (Hunter et al., 1998). At the same time, 39–81% silver was recovered compared to 86% with cyanide.
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Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 65 Fig. 3. Particles size analysis of gold concentrate Fig. 4. XRD analysis of gold concentrate obtained by flotation Table 1. Major elements composition of the ore and floated concentrate
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HYPOCHLORITE LEACHING OF GOLD ORE 7 1 Free Milling Gold Ore The free milling gold ore used in this study contains sulphide minerals, such as chalcopyrite and pyrite. Conventional cyanidation resulted in 95 % of the gold being extracted under strong leaching conditions, i.e., a grind of 90 % minus 200 mesh, leach with 1 g5 NaCN at pH 11.0 for
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ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold recovery by direct cyanide leaching, after fine grinding of mineral indicates a refractory mineral [1]. The refrac- tory ore must be destroyed or attacked by chemical means with the use of oxidative processes, such as oxida-
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1992-9-15process for recovery of gold from gold ores using a complexing pretreatment and sulfurous acid leaching the ground ore is blended with an oxidizing agent such as calcium hypochlorite and then with a gold-complexing agenthe ore blend is slurried in water, the process can replace cyanide as the leaching agent for some gold orest the.
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An oxide gold ore from Placer, Surigao Del Norte was subjected to chloride-hypochlorite and cyanide leaching at room temperature at 3 different hours – 4 hours, 12 hours and 24 hours. This project characterized the ore used and assessed the effects
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from the dissociation of the complex is used to leach gold from the ore. The stepwise dissociation of cyanide from copper-cyanide complexes can also be used to leach gold from a variety of oxide and sulphide ores. The copper cyanide's fourth ligand readily dissociates at low cyanide concentrations for use in gold leaching.
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Hypochlorite Leaching of Gold Ore. 2019-11-24 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 leaching solution containing 1 g/L NaCl, 1 % HCl and 2 % NaOCl, nearly 90 % of the gold was extracted in only 30 minutes.
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The drawback of the proposed methods is the low degree of extraction with treatment resistant gold-bearing ores. Known methods of processing of gold-silver ores and concentrates containing natural sorbents and sulfides. Thus, in A.S. No. 1356481 SU ore is treated with a mixture of kerosene and thiocarbamide, and then spend cyanide leaching.
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Hypochlorite Leaching of Gold Ore. 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 leaching solution containing 1 g/L NaCl, 1 % HCl and 2 % NaOCl, nearly 90 % of the gold was extracted in only 30 minutes.
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An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to
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Hypochlorite pretreatment of a refractory carbonaceous gold ore showed promise as a method for oxidizing sulfidic and carbonaceous materials prior to conventional cyanide heap leaching. However, previous studies showed hypochlorite consumption is high and gold extraction is proportional to hypochlorite consumption.
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How To Leach Gold Ore With Chlorination Sciencing . Apr 25 2017 how to leach gold ore with chlorination the mixture should be 15 percent sodium hypochlorite and 33 percent hydrochloric acid the mixture should cover the rocks so multiply the mixture until the rock is covered aerating the mixture speeds up the leaching process because it. More ...
Get Pricegold ore hypochlorite oxidation leaching Prior art date 2012-02-24 Application number RU2012106810/02A Other languages Russian (ru) Other versions RU2012106810A (en Inventor Александр Иванович Заболоцкий Геннадий Сергеевич Гребнев Александр Дмитриевич Федотов
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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.
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Gold recovery by activated carbon adsorption was about 49.852%. Keywords: gold ore, leaching, hypochlorite-choride, activated carbon 1. Introduction Gold leaching from ores by hydrometallurgy method has been developed using several reagents. One of the most commercial reagents used for the gold extraction from the ore is cyanide solution1,2,3 ...
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An oxide gold ore was subjected to chloride hypochlorite leaching at room temperature concentration, and HCl concentration on gold leaching performance were investigated kinetics, taking twice the time (46 h) to achieve maximum gold recovery of 58% compared to sodium hypochlorite
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Recovery of the Gold Now we have our ore with a nice red-brown solution of iodine and, hopefully, a whole bunch of dissolved gold in the solution. We can't sell it that way. Got to get it out and make it look like gold. First we have to get rid of all the material that we have been extracting.
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In this paper, gold leaching of a refractory sulfide concentrate by chloride–hypochlorite solution was investigated and effects of stirring speed, temperature and particle size on the leaching ...
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Jun 01, 2007· An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice ...
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alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in stirred tank reactors or heaps, the size and type of equipment needed for a thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our
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