Chloride–hypochlorite leaching of gold from a

2013-6-1  Among these species, hypochlorous acid is the most effective oxidizing agent (Jeffrey et al., 2001). This oxidant can also oxidize pyrite (Ghobeiti Hasab et al., in press, Ikiz et al., 2006, Ravinder et al., 2010). Oxidation of pyrite and leaching of gold by hypochlorous acid may be expressed as Eqs.,.

Chloride–hypochlorite leaching and hydrochloric acid

2014-2-1  1. Introduction. Hypochlorite solution has been recognized as a strong oxidizing reagent to oxidize metal sulfides (Ikiz et al., 2006).In this solution depending on pH, various species of hypochlorite ion (pH > 7.5), hypochlorous acid (3.5 < pH < 7.5) and chlorine gas (pH < 3.5) are produced.Among these species, hypochlorous acid (HOCl) is the most effective oxidant to leach gold as the [AuCl

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING

2012-10-4  Leaching of gold with hypochlorous acid follows reaction (1) (Jeffrey et al., 2001): +2Au + 3HOCl + 3H + 5Cl¯ 2[AuCl 4]¯ + 3H 2 O. (1) Controlling solution pH and Eh is important for stabilizing the gold complex. Fail-ing to do this would cause the gold to reprecipitate, after it is dissolved from the ores

Leaching of an oxide gold ore with chloride/hypochlorite

The leaching of gold in chloride/hypochlorous acid system has been already reported [44] [45] [46]. Fig. 9(a) and Table 4 show the changes in the dissolution rate constant of gold-wire in HCl

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 sluggish gold leaching kinetics, taking twice

Leaching of an oxide gold ore with chloride/hypochlorite

found to have a major effect on gold leaching kinetics and maximum gold recovery. A high level of 9 g/L of added HCl causes HClO to be very reactive, producing very fast kinetics, reaching 67% gold extraction in 4 h. It also causes a faster consumption of hypochlorous acid, through catalytic decomposition (by NiO and CuO) and disproportionation.

(PDF) Chloride-hypochlorite oxidation and leaching of

2013-1-1  Results showed that after 30 min leaching, 100% of gold was extracted from a 45 min-milled sample while only 37.2% of gold was obtained from the un-milled sample after 480 min leaching

Simultaneous sulfide oxidation and gold leaching of a

2013-9-1  Among these species, hypochlorous acid is the most effective oxidant (Jeffrey et al., 2001). Oxidation of sulfides by hypochlorous acid has the advantage of sulfate formation instead of elemental sulfur (reaction ) (Ikiz et al., 2006). In hypochlorous acid solution, gold is dissolved and [AuCl 4]

Recovery of silver and gold WHITNEY; JOHN W.

The gold is recovered by leaching the solid residue remaining after the ferric chloride-acid brine leach with a hypochlorous acid solution. The reactions taking place are as follows: 2Au+Cl 2 2AuCl(c) 2AuCl(c)+Cl AuCl 2 (aq) 2AuCl(c)+Cl +Cl 2 AuCl 4 (aq)

Gold from bleach,vineger and hydrogen peroxide Gold

2018-5-6  Bleach and vinegar will generate some hypochlorous acid (chlorine gas dissolved in water), chlorine gas Cl2, and sodium acetate, acetic acid, sodium chloride, oxygen, along with others in an organic carbon based compound. this does not mean just because we have chemical or compounds that can oxidize gold that it is a good idea to do so with them.

Leaching of an oxide gold ore with chloride/hypochlorite

The leaching of gold in chloride/hypochlorous acid system has been already reported [44] [45] [46]. Fig. 9(a) and Table 4 show the changes in the dissolution rate constant of gold-wire in HCl

Chloride–hypochlorite leaching and hydrochloric acid

Results showed that after 30 min leaching, 100% of gold was extracted from a 45 min-milled sample while only 37.2% of gold was obtained from the un-milled sample after 480 min leaching (at 25 °C

(PDF) Leaching of an oxide gold ore with chloride

Leaching of an oxide gold ore with chloride/hypochlorite solutions. Download. Related Papers. A Comparative Study of Cyanide and Chloride Hypochlorite Gold Leaching of Oxide Ore from Placer, Surigao Del Norte. By Renee Alexis Taladua. Application of Alternative Lixiviants for Secondary Heap Leaching of Gold.

(PDF) Leaching and Adsorption of Gold from Lape

Removing this layer by hydrochloric acid and further leaching by chloride–hypochlorite increased the gold recovery. It also causes a faster consumption of hypochlorous acid, through

Leaching and Adsorption of Gold from Lape-Sumbawa

2017-1-29  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

(DOC) A Comparative Study of Cyanide and Chloride

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

Recovery of silver and gold WHITNEY; JOHN W.

The gold is recovered by leaching the solid residue remaining after the ferric chloride-acid brine leach with a hypochlorous acid solution. The reactions taking place are as follows: 2Au+Cl 2 2AuCl(c) 2AuCl(c)+Cl AuCl 2 (aq) 2AuCl(c)+Cl +Cl 2 AuCl 4 (aq)

Optimization Process of the Refractory Gold Ore Extraction

2021-1-8  Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. 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 condition of gold extraction from refractory gold ore. The studied

Chlorination Leaching of Refractory Ores

2021-9-15  Direct leaching of ores becomes very expensive using chlorine systems. I have tested leaching of gold in worked out mining areas using thiourea in an acid environment results, leaching and absorption onto carbon was remarkable. The problem however was the environmental issues associated with thiourea. There is a lot of literature on this.

Effect of Pretreatment of Sulfide Refractory Concentrate

2013-12-24  rite. Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. A clear boundary between refractory and non-refractory 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

Optimization Process of the Refractory Gold Ore Extraction

2021-1-8  Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. 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 condition of gold extraction from refractory gold ore. The studied

Recovery of silver and gold WHITNEY; JOHN W.

The gold is recovered by leaching the solid residue remaining after the ferric chloride-acid brine leach with a hypochlorous acid solution. The reactions taking place are as follows: 2Au+Cl 2 2AuCl(c) 2AuCl(c)+Cl AuCl 2 (aq) 2AuCl(c)+Cl +Cl 2 AuCl 4 (aq)

Gold Recovery Process from Primary and Secondary

Thus, formed hypochlorous acid functions as a strong oxidation agent, converting solid metals into metal ions, dissolving into hydrochloric acid solution, where the metal ions give rise to stable chloro-complexes interacting with chloride ions; e.g., gold(III) is present as AuCl 4 −, anionic species. However, because the hypochlorous acid

Gold from bleach,vineger and hydrogen peroxide Gold

2018-5-6  Bleach and vinegar will generate some hypochlorous acid (chlorine gas dissolved in water), chlorine gas Cl2, and sodium acetate, acetic acid, sodium chloride, oxygen, along with others in an organic carbon based compound. this does not mean just because we have chemical or compounds that can oxidize gold that it is a good idea to do so with them.

US5147617A Process for recovery of gold from gold ores

A process for recovering gold from gold-bearing ores includes the steps of forming a slurry of ground ore and treating the ore with an oxidizing and complexing agent such as hydrogen sulfide or a sulfide salt. A chelating agent, SO 2,air, and an anion exchange resin are added to the slurry to subject the ore to a simultaneous sulfurous acid leaching and anion exchange resin adsorption step

Hydrochloric acid HCl PubChem

Hydrochloric acid, solution is a colorless watery liquid with a sharp, irritating odor. Consists of hydrogen chloride, a gas, dissolved in water.Sinks and mixes with water.Produces irritating vapor.

acid used to leach gold thehollandbakery.co.za

A statistical approach to the experimental design of A statistical approach to the experimental design of the sulfuric acid leaching of gold-copper ore . Inquire Now; Gold cyanidation Wikipedia. Despite being used in 90% of gold production: gold cyanidation is controversial due to

Chapter L HYDROMETALLURGY & SOLUTION MINING

2013-5-9  Most common leaching agent used in gold salvation in anode slime in aqueous media such as aqua regia (Wk Wang et al,1981), cyanide (Su Jianhua et al, 2002), thiourea (Omer Yavuz et al, 2007), hydrochloric acid (J. Biswas et al, 1998), hydrochloric acid and hydrogen peroxide (Rw Stanley, 1987), hydrochloric acid, and

CN101157986A nontoxic gold extracting method

The invention relates to a wet gold extraction method, and is a quick and non-toxic gold extraction method. The method uses the solution of sodium bromate, sodium chloride and vitriol as the gold leaching solution, polyurethane foam as the substance to absorb gold, sodium sulfite solution as a desorption agent, oxalic acid as a reducing agent, hydrochloride solution as recycling agent of

Sulphide Leaching Mineral Processing & Metallurgy

2015-6-24  4. Concentrated sulphuric acid: Most sulphides are oxidized to sulphate. From the sulphated ore, all of the zinc, copper and iron can be leached with water while lead, silver, gold and antimony will remain in the insoluble residue. Leaching of an Arsenical Copper Sulfide