gold leaching with hypochlorite
Hypochlorite Leaching of Gold Ore
2017-11-8 · 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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Leaching of an oxide gold ore with chloride/hypochlorite ...
kinetics, taking twice the time (46 h) to achieve maximum gold recovery of 58% compared to sodium hypochlorite. 10 g/L of total initial hypochlorite species in solution produces reasonable gold recoveries. The amount of added HCl and hence the initial pH was found to have a major effect on gold leaching kinetics and maximum gold recovery.
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Leaching of an oxide gold ore with chloride/hypochlorite ...
2007-6-1 · 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
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Advances in Gold and Silver Processing
2016-8-3 · HYPOCHLORITE LEACHING OF GOLD ORE 69 Overall reaction of equations (I), (2) and (3) can be summarized as follows: It is obvious that both hydrochloric acid and sodium chloride have affected the gold dissolution in hypochlorite solution. RESULTS AND DISCUSSION Gold Precipitate The dissolution of gold in dilute hypochlorite solution is very slow.
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Leaching of an oxide gold ore with chloride/hypochlorite ...
2021-12-28 · 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 ...
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Gold Leaching by Sodium Chloride and Calcium
2018-8-19 · Therefore, the current work aims at investigating gold leaching from an oxidized material by means of a solution comprising calcium hypochlorite and sodium chlorite. The sample used in the current research contained 66.1% Fe 2 O 3 , 20.4% SiO 2 , and 35.7 g/t of Au.
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(PDF) Chloride-hypochlorite oxidation and leaching of ...
2022-1-21 · Direct hypochlorite leaching yielded gold and silver recoveries of 42.7% and 45.0%, respectively. With aqueous pressure oxidation followed
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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING
2012-10-4 · Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig. 1. The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig. 2.
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Dissolution of Silver and Gold with Sodium Hypochlorite ...
2020-4-15 · Two-stage leaching was carried out: first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4) and a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl); the results show extraction around 96% for Mn and 98.73% and 83% of Ag and Au ...
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Leaching of gold-containing ores with application of ...
2019-9-18 · 85.7% with preliminary oxidation using calcium hypochlorite increasing the gold recovery degree by 8.4%, when leaching the gravity tailings using calcium hypochlorite -73.1%, sodium peroxide - 75.6%, Ascor oxidation activator (AS-45102) - 71.9%. Key words: gold-bearing rock, leaching, gravity concentrates, gravity tailings, recovery, oxidation ...
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Leaching of an oxide gold ore with chloride/hypochlorite ...
Abstract 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
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Chloride–hypochlorite leaching of gold from oxidized ores ...
The gold analysis was carried out by atomic absorption spectroscopy (AAC). Direct hypochlorite leaching resulted in gold recovery of 23.0 % in 4 hours and 72.7 % in 24 hours. After pre-oxidation and subsequent leaching with hypochlorite, the recovery was 80.2 % and 98.8 % in 4 and 24 hours, respectively.
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gold leaching with hypochlorite - hurtownia-apex.pl
gold leaching with hypochlorite - Mineral Processing EPC. Oct 24, 2013· The fact that with chlorine in very acidic conditions where gold is oxidized by chlorine, and also noting that HOCl can also be in a solution with chlorine, at fairly low pH, with about pH one, and that it looks like a solution could be a mix of chlorine and hypochlorite, and at a slightly higher pH where gold will
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Leaching of gold-containing ores with application of ...
2019-9-18 · 85.7% with preliminary oxidation using calcium hypochlorite increasing the gold recovery degree by 8.4%, when leaching the gravity tailings using calcium hypochlorite -73.1%, sodium peroxide - 75.6%, Ascor oxidation activator (AS-45102) - 71.9%. Key words: gold-bearing rock, leaching, gravity concentrates, gravity tailings, recovery, oxidation ...
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Gold Refining with hypochlorite | Gold Refining & Metal ...
2021-12-29 · The excess, after dissolution of the gold is complete, can be removed by gently boiling the solution. Hypochlorite is destroyed at temps above 112°F. The solution should be brought to a low boil for a couple of hours and allowed to cool. Expect a white precipitate of sodium chloride to form when cooled.
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Comparison of Cyanide and Chloride-Hypochlorite
In this research, cyanide and chloride–hypochlorite leaching of gold from a pyritic concentrate (particle size: −75+53 µm, gold content: 27.15 g/t) were compared. It was shown that only 13.6 % of gold was extracted after 24 h leaching by
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Leach Gold Ore with Chlorination | Gold Refining & Metal ...
2015-10-5 · When you add hypochlorite you will raise the pH so you will need to add HCl to get the pH back into range. If the redox is less than 1000mv you will start preferentially leaching base metals and will also precipitate out some of the already leached gold. Any sulfides present will be digested by the chlorine and the gold will all be leached from ...
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次氯酸钠浸金电化学及难浸金矿浸出实验研究 - j ...
2017-12-29 · Electrochemical Profile of Leaching Gold with Sodium Hypochlorite and Experiment on Leaching A Refractory Gold Ore CHEN Liang 1, 2, TANG Daowen 1, 2 *, GUAN Guichao 1, GAO Peng 1, YAN Pu 1, LIU Xianchao 1 (1. College of Materials and Metallurgy2.
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Prospects for use of chlorine-containing leaching ...
2021-10-11 · hypochlorite leaching resulted in 23.0% gold recovery in 4 hours and 72.7% in 24 hours. After preoxidation followed by leaching with hypochlorite, gold recovery was 80.2% and 98.8% in 4 and 24 hours, respectively. After ultrasonic treatment, the
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DISSOLUTION OF GOLD WITH CYANIDE REPLACING
2014-9-8 · queries. The aim of this paper is to study leaching of gold with cyanide replacing alternatives such as ammonium thiosulfate, chloride-hypochlorite, thiourea and thiocyanate to provide new cases for the tool. The behaviour of gold was examined with electrochemical tests and weight loss measurements a using
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Colorimetric Determination of Hypochlorite Based on the ...
Hypochlorite plays a critical role in killing microorganisms in the water. However, it can also cause cardiovascular diseases, neuron degeneration, and cancer to humans. Although traditional methods feature excellent sensitivity and reliability in detecting hypochlorite, the expensive instruments an
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Investigation on the recovery of gold from pretreated
2019-12-26 · With calcium hypochlorite for chlorination leaching, under suitable conditions of calcium hypochlorite: adding amount 8%, chlorination temperature 333 K and chlorination time 2 h, gold was effectively recovered, the leaching rate is 81%.
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KINETIC STUDIES FOR GOLD LEACHING OF A
2022-1-30 · concentrate using chloride/hypochlorite media" Iranian Journal of Materials Science & Engineering Vol. Il, Number 2, June 2014 controllea. Witn aecreasmg or p H (resultea rom precious metals leacnmg trom a chalcopyrite hypochlorite ion is the dominant oxidant species; therefore, leaching rate of gold is chemically 185-190.
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Chloride–hypochlorite oxidation and leaching of refractory ...
4. BAGHALHA M., 2007, Leaching of an oxide gold ore with chloride/hypochlorite solutions, International Journal of Mineral Processing, 82, 178–186. 5. BAGHALHA M., 2012, The leaching kinetics of an oxide gold ore with iodide/iodine solutions, Hydro-metallurgy 113–114, 42–50. 6.
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Comparison of Cyanide and Chloride
In this research, cyanide and chloride–hypochlorite leaching of gold from a pyritic concentrate (particle size: −75+53 µm, gold content: 27.15 g/t) were compared. It was shown that only 13.6 % of gold was extracted after 24 h leaching by
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金矿非氰化浸金研究进展
2020-11-15 · Hasab M G, Rashchi F, Raygan S. Simultaneous sulfide oxidation and gold leaching of a refractory gold concentrate by chloride-hypochlorite solution. Miner Eng, 2013, 50-51: 140 [50] Hasab M G, Rashchi F, Raygan S. Chloride-hypochlorite leaching and
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Prospects for use of chlorine-containing leaching ...
2021-10-11 · hypochlorite leaching resulted in 23.0% gold recovery in 4 hours and 72.7% in 24 hours. After preoxidation followed by leaching with hypochlorite, gold recovery was 80.2% and 98.8% in 4 and 24 hours, respectively. After ultrasonic treatment, the
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次氯酸钠浸金电化学及难浸金矿浸出实验研究 - j ...
2017-12-29 · Electrochemical Profile of Leaching Gold with Sodium Hypochlorite and Experiment on Leaching A Refractory Gold Ore CHEN Liang 1, 2, TANG Daowen 1, 2 *, GUAN Guichao 1, GAO Peng 1, YAN Pu 1, LIU Xianchao 1 (1. College of Materials and Metallurgy2.
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Leach Gold Ore with Chlorination | Gold Refining & Metal ...
2015-10-5 · When you add hypochlorite you will raise the pH so you will need to add HCl to get the pH back into range. If the redox is less than 1000mv you will start preferentially leaching base metals and will also precipitate out some of the already leached gold. Any sulfides present will be digested by the chlorine and the gold will all be leached from ...
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「sodium hypochlorite gold leaching」
Leaching of an oxide gold ore with chloride/hypochlorite . 11/17/2020· In this research, effect of mechanical activation on the chloride hypochlorite leaching of gold from a refractory pyritic concentrate containing ca. 27 g/t gold was investigated for the first time.
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