Leach Gold by Sodium Hypochlorite / Chlorine & … - Hypochlorite Leaching of Gold Ore - Metallurgist
HYPOCHLORITE LEACHING OF GOLD ORE W.T.Yen R.A.Pindred and M.P.Lam Mining Engineering Queens University Kingston Ontario Canada K7L 3N6 ABSTRACT Cyanide is a conventional lixiviant for gold extraction but its toxicity is a major concern for the environmentalist There are many alternative non-cyanide lixiviants such383. Sep 26, 2015. #2. 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.
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How you can Leach Gold Ore With Chlorination - CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF …
University of Nevada, Reno Login; Toggle navigation. View Item ScholarWorks | University of Nevada, RenoAfter 24 hours, direct cyanide leaching of the initial ore resulted in only 54.8% gold recovery. However, cyanidation after dissolving the ore sample in hydrochloric acid (HCl), sulfuric acid (H 2 SO 4), ferric chloride (FeCl 3) and nitric acid (HNO 3), re-spectively, increased the gold recovery to 98.1%. This shows that the ore is a sulfide ...
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Advances in Gold and Silver Processing - samin-na - Leach Gold Ore with Chlorination
hypochlorite on the gold extraction from a carbonaceous ore in Nevada by heap leaching. Extractions of greater than 70 per cent were attained from three ores. When the hypochlorite pretreatment was followed by cyanidation greater than 85 per cent gold extraction was achieved. Many investigators, Eisele at al. (1970,Hypochlorite Leaching of Gold Ore. 08/11/2017 For a refractory ore, pretreatment is required in order to expose the gold surface to the leach solution. An acidic hypochlorite solution can be added to the autoclave for pressure oxidation and extraction of the gold at the same time. It required 50 % sodium hypochlorite or 120 kg/t available ...
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Hypochlorite pretreatment in heap leaching of a low grade … - Hypochlorite pretreatment in heap leaching of a low …
The performance of chloride/hypochlorite solution for gold leaching also depends on major minerals pres-ent in the ore. Gold–chloride complex is rather unstable and may re-precipitate upon contact with a reductant, such as sulfidic materials of ore. Puvvada and Murthy (2000) used chloride/hypochlorite solution to leach goldHYPOCHLORITE 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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Sodium hypochlorite pretreatment for heap leaching gold ore - Optimization Process of the Refractory Gold Ore …
Hypochlorite pretreatment in heap leaching of a low grade carbonaceous gold ore M. Ahmadiantehrani, J.L. Hendrix and G. Ramadorai Abstract-The concept of hypochlorite treatment prior to cyanidation in the heap leaching of low grade carbonaceous gold ores is discussed. Laboratory column leach tests using aCombining sulfide oxidation and gold leaching using chloride/hypochlorite solution was used for a refractory sulfide concentrate containing 20.45 ... Leaching of an oxide gold ore with chloride/hypochlorite solutions. International Journal of Mineral Processing, 82 (2007), pp. 178-186.
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Gold Refining with hypochlorite - Leaching of an oxide gold ore with chloride/hypochlorite solutions ...
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.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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Chloride–hypochlorite leaching of gold from oxidized ores of the - Hypochlorite Leaching Of Gold Ore - HeNan Mining Heavy …
Fig. 7. Percent Ca and Mg leached from ankerite during test #1. Based on simple mass balance calculations, ankerite in the ore has the composition Ca(Fe0.71, Mg0.29)(CO3)2. Weight percentage of this compound in the ore is estimated to be roughly 23%- "Leaching of an oxide gold ore with chloride/hypochlorite solutions"The hypochlorite to leach 1 mole of chalcopyrite with 1 g of consumption ratio was as high as 57.6 with 1 g of the mineral was 45.88 and that with 10 g was 4.59. These the mineral and decreased to 12.9 with 10 g of the values correspond to 5.4 and 0.54 times as much as the mineral. ... Leaching of an oxide gold ore with chloride/hypochlorite ...
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Hypochlorite Leaching of Gold Ore - 911metallurgist - hypochlorite leaching of gold ores
After pressure oxidation of the concentrate and subsequent hypochlorite leaching, the recoveries increased to 90% for gold and 93% for silver. In contrary to reducing ores and concentrates, some ores may naturally contain oxidizing agents, such as MnO 2. Gold in these types of materials can be leached with an NaCl/acid solution only.Gold recoveries of 10% and 80% are achieved at 12 and 167 lb/ton hypochlorite consumption, respectively. Increasing hypochlorite concentration increases the rate of extraction. Fora given hypochlorite consumption, gold extraction increased with decreasing ore bed height.
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Chloride-hypochlorite oxidation and leaching of … - Leaching Processes: A Case-Based Reasoning Application
This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum ...Sep 28, 2020. #1. I have a problem. I used 35% hydrochloric acid and 15% sodium hypochlorite acid on a roasted refractory gold ore directly. The ore was roasted at 650 degrees C for half an hour and cooled before it was submerge with acid mix. Kept it in for 4 hours and adding 15ml sodium hypochlorite every 20 minutes to keep oxidation at 1100mV.
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Advances in Gold and Silver Processing - xuminghu - hypochlorite leaching of gold ores|Mining and Rock Technology
The initial gold content of ore is 0.8–0.95 g/t. Extraction of gold was carried out using freshly primed chloride–hypochloride solution The solution was prepared by electrolysis of a sodium chloride solution (NaCl) at a concentration of 20 g/dm3 with the addition of 0.1 N hydrochloric acid (HCl). ... Direct hypochlorite leaching resulted in ...The Leaching of Gold-silver from Refractory Gold Concentrate by Chlorine-hypochlorite Solution. Leaching experiments of gold and silver from roasted concentrate were carried out using a chlorine-hypochlorite solution. The leaching rate of gold was 75% at 1.5:1 ratio of chlorine and hypochlorite….
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Chlorine leach of refractory gold ore | Gold Refining & Metal - Leaching of an oxide gold ore with chloride/hypochlorite …
Due to formation of CaOCl+ complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice the time (46 h) to achieve maximum gold...minerals Article Assessing the Similarity of Cyanide-Free Gold Leaching Processes: A Case-Based Reasoning Application Maria Leikola 1,*, Christian Sauer 2, Lotta Rintala 1,3, Jari Aromaa 1 and Mari Lundström 1 1 Department of Chemical and Metallurgical Engineering, Aalto University, 02150 Espoo, Finland; [email protected].fi (L.R.); [email protected].fi (J.A.); …
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Optimization Process of the Refractory Gold Ore Extraction by - hypochlorite leaching of gold ore 6821 - naturavertical.es
Fig. 6. Eh–pH diagram of chloride/hypochlorite system at 25 °C. Total Cl concentration=2 M. This diagram was produced with HSC Chemistry software (Outokumpu Research, Pori, Finland)- "Leaching of an oxide gold ore with chloride/hypochlorite solutions"5 Dec 2006 In 1969, the heap leaching concept was applied to low-grade gold and on hypochlorite was developed to increase the recovery of gold from . Sodium hypochlorite - Gold Refining Wiki Sodium hypochlorite together with hydrochloric acid has been used for gold ore leaching. For example in the iGoli method.
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Simultaneous sulfide oxidation and gold leaching of a refractory gold … - sodium thiosulphate And hypochloride leaching | Page 2 | Gold …
Gold Refining Processes. Chemical Processes & Chemical Discussion . sodium thiosulphate And hypochloride leaching. Thread starter labalkeny; Start date Oct 15, 2016 ... . sodium thiosulphate And hypochloride leaching. Thread starter labalkeny; Start date Oct 15 ...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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