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US8894740B2 Process for the recovery of gold from an

A process and system for recovery of gold from an ore having the steps of i) providing the ore containing the gold to be recovered, ii) leaching the ore in an oxidative chloride medium, including a nitrogen species to produce a solution comprising gold; and iii) recovering the gold from the solution. The gold in a preferred embodiment is recovered from refractory and carbonaceous ores.

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EP2536860A1 Process for the recovery of gold from an

The present invention relates to a process and system for recovery of gold from an ore comprising the steps of i) providing the ore containing the gold to be recovered, ii) leaching the ore in an oxidative chloride medium, comprising a nitrogen species to produce a solution comprising gold; and iii) recovering the gold from the solution.

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AP201206410A0 Process for the recovery of gold from an

ore gold recovery nitrogen species chloride medium Prior art date 2010-02-18 Application number AP201206410A Inventor Carl White Bryn Harris Original Assignee Neomet Technologies Inc Priority date (The priority date is an assumption and is not a legal conclusion.

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WO2011100821A1 Process for the recovery of gold from

Discuss; 239000010931 gold Substances 0.000 title claims abstract description 136; 229910052737 gold Inorganic materials 0.000 title claims abstract description 127; PCHJSUWPFVWCP

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Process for the recovery of gold from refractory ores by

A process for recovering precious metals from a refractory ore by forming a slurry which is heated to a temperature in excess of about 150° C. at an oxygen partial pressure in excess of about 10 psia for an effective amount of time to form a partially oxidized slurry which is then subjected to carbon-in-leach treatment to separate the precious metals.

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The recovery of gold from refractory ores by the use of

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology

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Electrochemical recovery of minor concentrations of gold

2018-6-10  A novel process for gold recovery from chloride leaching solutions is proposed. • The method uses spontaneous redox replacement reactions between gold and copper. • No chemical addition is required to obtain high selectivity of the process. • Concentration of gold in final product increased 1000 times compared to initial.

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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 sluggish gold leaching kinetics, taking twice

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Gold Recovery from Chloride Leaching Solutions by

2019-9-27  process and is suitable for elemental gold recovery from chloride leaching solution. In this paper, cupric chloride solution from ore leaching was tested for applicability of the EDRR method. Obtained results demonstrate that gold can be recovered from industrial process solutions

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The recovery of gold from refractory ores by the use of

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology

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(PDF) Electro-Hydrometallurgical Chloride Process For

2021-9-1  Overall, after 150 h of pilot experiment, 83% of dissolved gold was recovered from solution on the cathode, resulting in 68.5% holistic recovery of gold from ore. Furthermore, process simulation

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Electrochemical recovery of minor concentrations of gold

2018-6-10  A novel process for gold recovery from chloride leaching solutions is proposed. • The method uses spontaneous redox replacement reactions between gold and copper. • No chemical addition is required to obtain high selectivity of the process. • Concentration of gold in final product increased 1000 times compared to initial.

get price

Electro-hydrometallurgical chloride process for selective

Furthermore, process simulation model was built, and it suggested that closed-loop operation of cupric chloride leaching EDRR recovery copper precipitation process can recover in total over 84% of gold from refractory telluride ore to the cathode product, providing further evidence of true potential of EDRR in sustainable gold extraction.

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Challenges and opportunities in the recovery of gold from

A two-step process with Cu and Au recovery efficiencies of 98% and 44%, respectively was reported in which copper leaching is accomplished with the chemolithotrops Acidithiobacillus ferrovorans and Acidithiobacillus thiooxidans followed by gold

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Chlorine extraction of gold DUNN; WENDELL E.

The process of claims 2 or 3 wherein the spent ore is leached to separate from the spent ore silver chloride. 5. The process of claim 4 wherein the spent ore is leached with an ammonical solution. 6. The process of claim 1 wherein metallic gold is separated by dissolving the halide salt-gold chloride mixture in water followed by contacting the

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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 sluggish gold leaching kinetics, taking twice

get price

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

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Development of Mixed-Chloride Hydrometallurgical

2015-12-12  A mixed-chloride process flowsheet for the recovery of Au from gold-bearing materials is shown in Fig. 10 . This process has several advantages such as (i) it is environmentally friendly as no cyanidation is involved and it can be applied in jurisdictions where use of cyanide is not permitted, (ii) selective extraction of Au from pregnant leach

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Gold Recovery from Chloride Leaching Solutions by

2019-9-27  process and is suitable for elemental gold recovery from chloride leaching solution. In this paper, cupric chloride solution from ore leaching was tested for applicability of the EDRR method. Obtained results demonstrate that gold can be recovered from industrial process solutions

get price

US Patent for Chloride process for the leaching of gold

2013-4-8  A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent

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Electro-hydrometallurgical chloride process for selective

Furthermore, process simulation model was built, and it suggested that closed-loop operation of cupric chloride leaching EDRR recovery copper precipitation process can recover in total over 84% of gold from refractory telluride ore to the cathode providing further evidence of true potential of EDRR in sustainable gold extraction.

get price

The recovery of gold from refractory ores by the use of

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology

get price

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

get price

Development of Mixed-Chloride Hydrometallurgical

2015-12-12  A mixed-chloride process flowsheet for the recovery of Au from gold-bearing materials is shown in Fig. 10 . This process has several advantages such as (i) it is environmentally friendly as no cyanidation is involved and it can be applied in jurisdictions where use of cyanide is not permitted, (ii) selective extraction of Au from pregnant leach

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Electrolytic gold recovery and separation process

The recovery of gold from its ores is commonly accomplished by one of a number of methods including flotation, amalgamation with mercury or by the cyanide process. Where the gold content of the ore is high, smelting is economical; the cyanide process is employed for the lower concentrations of gold.

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Treatment of Refractory Gold Ores SpringerLink

Abstract. Problem ores that yield low (say less than 80%) gold recovery by cyanidation when “normally ground” are defined as refractory. The term, as well as the technical methods used to treat such ores, are relatively new. Rose and Newman’s very comprehensive book, The Metallurgy of Gold, does not even contain the term refractory in its

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Hydrometallurgical Processes for the Recovery of Rare

2017-2-8  Process Research ORTECH Inc. (PRO) has developed innovative mixed chloride leaching processes for the recovery of REEs from alumino-silicate ores, and nickel and cobalt from laterite ores.

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CHEMICAL REFINING PROCESS FOR Pb, Au AND Ag

2018-12-20  subsequent recovery of Pb and the precious metals Ag and Au. The residue is first treated with a saturated sodium chloride solution, whereupon a chloride solution of lead (NaPbCl3) is obtained. From the chloride solution, lead was deposited in the form of lead carbonate, followed by reductive melting, whereupon lead anode was obtained.

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