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(PDF) Chloride hypochlorite oxidation and leaching of

This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface methodcentral composite design (RSM CCD) as a

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Leaching and Adsorption of Gold from Lape Sumbawa Rocks

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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Hypochlorite Leaching of Gold Ore Hydrochloric Acid

The hypochlorite on the gold extraction from a chemical composition of the two ores is carbonaceous ore in Nevada by heap shown below: leaching. Extractions of greater than 70 per cent were attained from three ores.

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Leaching of gold containing ores with application of

These ores are characterized with the presence of free, very fine gold uniformly distributed in the ore . There are three main ways to process raw materials depending on the mineralogical composition of the ores and the size of gold in them: gravity concentration; flotation recovery; gold leaching with pre 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

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Gold Refining with hypochlorite Gold Refining Metal

29/12/2021· 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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Leach Gold Ore with Chlorination Gold Refining Metal

05/10/2015· If the reading is less than 1000mv you need to add hypochlorite to get it up to 1000mv. 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.

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Sodium hypochlorite pretreatment for heap leaching gold ore

Gold extraction was shown to be dependent on sodium hypochlorite concentration, heap leach flowrate, temperature and leaching time or bed volumes. Optimum leaching conditions were 10°C and below utilizing a 1.0 percent sodium hypochlorite solution at a flowrate of 15 gal/ft2 day or greater for 2 to 13 bed volumes depending on the effluent

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Leaching and Adsorption of Gold from Lape Sumbawa Rocks

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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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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sodium thiosulphate And hypochloride leaching Gold

27/10/2016· This leach type is difficult to use with an ore having appreciable levels of sulfides. These sulfides will consume hypochlorite and lower the pH, this means needing more care with process control. Especially if run as a vat leach it is a commercial contender for leaching of ores, depending on the ore.

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sodium thiosulphate And hypochloride leaching Gold

27/10/2016· This leach type is difficult to use with an ore having appreciable levels of sulfides. These sulfides will consume hypochlorite and lower the pH, this means needing more care with process control. Especially if run as a vat leach it is a commercial contender for leaching of ores, depending on the ore.

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Leaching of an oxide gold ore with chloride/hypochlorite

Gold leaching by hypochlorite has been studied by Baghalha (2007) and Yen et al. (1990), who suggest that an oxidative pretreatment should be adopted

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Sodium hypochlorite pretreatment for heap leaching gold ore

Laboratory leaching experiments were conducted to ascertain the effectiveness of sodium hypochlorite solution, NaOCl, as a pretreatment for oxidizing the carbonaceous matter and dissolving gold from finely disseminated gold ores. The ores tested were from the Jerritt Canyon ore body (oxide, carbonaceous) in Elko County, Nevada, USA and

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(PDF) Chloride hypochlorite oxidation and leaching of

Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction.

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

After 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 refractory gold ore (Saba et al., 2011).

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Hypochlorite Leaching of Gold

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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Leaching of an oxide gold ore with chloride/hypochlorite

01/06/2007· Calcium hypochlorite produced a sluggish gold leaching kinetics, requiring twice more time (46 h) to achieve the maximum gold recovery of 58% compared to sodium hypochlorite. To have a reasonable gold leaching kinetics, it was found that OCl in solution must be equal or higher than 10 g/L. The amount of HCl added and hence initial pH was found

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Leaching of an oxide gold ore with chloride/hypochlorite

This retrograde adsorption trend is due 1992). Leaching of gold with hypochlorous acid follows to a shift in dominance from AuCl4 at pH = 4 to adsorbed Reaction (3). hydroxyl substituted species (such as AuCl (OH)3) at higher pH values (Machfsky et al., 1991).

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Hypochlorite Leaching of Gold Ore Hydrochloric Acid

The hypochlorite on the gold extraction from a chemical composition of the two ores is carbonaceous ore in Nevada by heap shown below: leaching. Extractions of greater than 70 per cent were attained from three ores.

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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 chlorine to extract 97 % of the gold from the ore.

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Prospects for use of chlorine containing leaching

work. Potassium and sodium hypochlorite obtained by electrolysis and gaseous chlorine are used as a solvent in the Ural deposits. . In work , the results of studies on the leaching of gold from crushed ore to a size of 12 + 0 mm are given. The use of sodium acetate as a chemical additive in leaching gold on bottle

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Leaching of an oxide gold ore with chloride/hypochlorite

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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gold leaching with hypochlorite

HYPOCHLORITE LEACHING OF GOLD ORE W.T.Yen, R.A.Pindred and M.P.Lam Mining Engineering, Queen's University Kingston, Ontario, Canada K7L 3N6 ABSTRACT Cyanide is a conventional lixiviant for gold extraction but its' toxicity is

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Prospects for use of chlorine containing leaching

work. Potassium and sodium hypochlorite obtained by electrolysis and gaseous chlorine are used as a solvent in the Ural deposits. . In work , the results of studies on the leaching of gold from crushed ore to a size of 12 + 0 mm are given. The use of sodium acetate as a chemical additive in leaching gold on bottle

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Hypochlorite Pretreatment of a Low Grade Carbonaceous Gold

06/04/2007· 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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Stage activation leaching of oxidized coppergold ore

The article emphasizes the urgent need of heap leaching in the current geotechnical conditions. The application prospects for heap leaching are connected with preliminary oxidation of refractory ore. Another important requirement is geo engineering typification of ore through geotechnical mapping. An alternative of cyanide in gold leaching is chlorine compounds.

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Leaching of an oxide gold ore with chloride/hypochlorite

The performance of chloride/hypochlorite solution for gold leaching also depends on major minerals pres ent in the ore. Goldchloride 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 gold

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METHOD OF OXIDATIVE LEACHING OF SULFIDE ORES AND/OR

The optimum leaching conditions of Artvin Murgul chalcopyrite ore in hypochlorite solution, SAU Fen Bilimleri Enstitusu Dergisi 9, Cilt 2, 2005, Page 6 11. Jeffrey et al. A kinetic study that compares the leaching of gold in cyanide, thiosulfate, and chloride systems. Metallurgical and Materials Transactions B, 2001, Vol 32B, Page 979 986.

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Chloridehypochlorite 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, 178186. 5. BAGHALHA M., 2012, The leaching kinetics of an oxide gold ore with iodide/iodine solutions, Hydro metallurgy 113114, 4250. 6.

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