Chlorine Gold Extraction
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Chlorine Gold Extraction

Gold extraction by chlorination using a pyrometallurgical ...

Abstract. The feasibility to recover the gold present in alluvial material, by means of a chlorination process, using chlorine as a reactive agent, has been studied. The influence of temperature ...

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Gold extraction by chlorination using a pyrometallurgical ...

2009-3-1  The objective of this research was, on one hand, to study gold extraction from an alluvial material, through a pyrometallurgical process, using chlorine gas as a reactant, and, on the other hand, to characterize the initial material and chlorination residues, using X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electronic ...

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Chlorine extraction of gold - DUNN; WENDELL E.

Chlorine extraction of gold . United States Patent 4353740 . Abstract: A process for treating a particulated gold bearing ore to recover the gold therein is disclosed. The process includes roasting the ore to remove sulfides as sulfur dioxide followed by chlorination of the ore at a temperature of about 350° C. in the presence of iron to form ...

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Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3  oxide, which has a great affinity with chlorine at working temper-atures (573–673 K). In the case of gold, this fact might be respon-sible for the increase in the gold volatilization from mineral since in the presence of iron chloride, a binary complex AuCl 3.FeCl 3 would be formed. Then, the following reactions for gold extraction might be ...

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US4353740A - Chlorine extraction of gold - Google Patents

A process for treating a particulated gold bearing ore to recover the gold therein is disclosed. The process includes roasting the ore to remove sulfides as sulfur dioxide followed by chlorination of the ore at a temperature of about 350° C. in the presence of iron to form a mixture of volatile gold chlorides and volatile gold-iron chlorides in the chlorine off gases followed by condensing ...

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Extraction of Gold

Bromine acts more energetically than chlorine, and has also been employed in the extraction. The recovery of the gold is effected similarly, and the bromine is then liberated by the action of chlorine, but it is impossible to prevent loss of bromine. Cyanide-process The extraction of gold by the cyanide-method is of great technical importance.

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Cyanide-free gold leaching in exceptionally mild chloride ...

2019-10-10  The oxidation agent was observed to affect gold extraction. In a slightly more concentrated chloride solution (2.8 M) gold extraction was 93–94% when minor cupric (0.1 M and 0.02 M) was used as oxidation agent. In ferric leaching, the gold extraction was slightly lower 85–89% (with ferric concentration of 0.1 M and 0.04 M).

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The Chemistry of the Extraction of Gold - SAIMM

2011-5-29  The Chemistry of the Extraction of Gold M.J. Nicol, C.A. Fleming and R.L. Paul 1S.1 General Principles 15.1.1 The chemistry of gold compounds Gold is the most noble of all the metals and this .is the key to both its eternal romance and its many practical uses in industry. It is the only metal, for

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Chemical feedbacks during magma degassing control

2021-3-19  For example, increasing melt chlorine concentration from 500 to 3000 ppm imparts an almost eight-fold increase in copper extraction efficiency (Fig. 4d); minor improvement (5–10% relative) in ...

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Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3  oxide, which has a great affinity with chlorine at working temper-atures (573–673 K). In the case of gold, this fact might be respon-sible for the increase in the gold volatilization from mineral since in the presence of iron chloride, a binary complex AuCl 3.FeCl 3 would be formed. Then, the following reactions for gold extraction might be ...

More

Extraction of Gold

Bromine acts more energetically than chlorine, and has also been employed in the extraction. The recovery of the gold is effected similarly, and the bromine is then liberated by the action of chlorine, but it is impossible to prevent loss of bromine. Cyanide-process The extraction of gold by the cyanide-method is of great technical importance.

More

Mechanism of selective gold extraction from multi-metal ...

2020-3-19  Mechanism of selective gold extraction from multi-metal chloride solutions by electrodeposition-redox replacement†. Ivan Korolev ab, Stylianos Spathariotis c, Kirsi Yliniemi d, Benjamin P. Wilson a, Andrew P. Abbott c and Mari Lundström * a a Hydrometallurgy and Corrosion, Department of Chemical and Metallurgical Engineering, Aalto University, 02150 Espoo, Finland.

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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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The iGoli mercury-free gold extraction process

The extraction of gold using 0.1% gold concentrate (1000 g/t) in chloride solution by producing Cl 2 in situ from the reaction between HCl and NaOCl (Equation 1) was studied (Mahlatsi, 2006). The ...

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How does gold react with chlorine? Gold Refining

2008-7-26  In wiki under gold(III) chloride it says it can be made by direct chlorination at high temperatures, but on the same page it says that it begins to decompose above 160*C to form gold(I) chloride and chlorine. So does that mean that chlorine + gold at a temperature below 160*C will form...

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Mechanism of selective gold extraction from multi-metal ...

The electrodeposition-redox replacement (EDRR) process is a promising method for a selective extraction of minor metals from complex mixtures. When it is performed in a benign medium (such as sodium chloride solution or deep eutectic solvent), the EDRR method provides a non-toxic alternative for a convention 2020 Green Chemistry Hot Articles

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The Chemistry of the Extraction of Gold - SAIMM

2011-5-29  The Chemistry of the Extraction of Gold M.J. Nicol, C.A. Fleming and R.L. Paul 1S.1 General Principles 15.1.1 The chemistry of gold compounds Gold is the most noble of all the metals and this .is the key to both its eternal romance and its many practical uses in industry. It is the only metal, for

More

Iron(II)-chloride for precipitation Gold Refining ...

2013-12-24  The two best known reagent to test gold in solution would be stannous chloride, and ferrous sulfate, the stannous chloride gives the violet color of colloidal gold purple of Cassius, the stannous chloride has s fairly short shelf life, especially depending on how it is made and stored, if stored in absence of air or oxygen, and with a piece of ...

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Chemical feedbacks during magma degassing control

2021-3-19  For example, increasing melt chlorine concentration from 500 to 3000 ppm imparts an almost eight-fold increase in copper extraction efficiency (Fig. 4d); minor improvement (5–10% relative) in ...

More

Recovery of gold from chloride solution with ion exchange ...

The extraction of gold from chloride solutions by ion exchange is examined. It is shown that at initial gold concentrations between 1-5 ppm, 20 g/l Cl-and pH 5, the kinetics of loading on weak base resins are slightly slower than those observed with activated charcoal. Equilibrium loading of auric chloride varies considerably as a function of pH from one resin to another.

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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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Gold refining by solvent extraction—the Minataur™

2009-8-26  A solvent-extraction route developed at Mintek for the chemical refining of gold from chloride media has shown considerable promise for the selective extraction of gold from silver, platinum-group metals (PGMs), and base metals, and has potential applications in the refining of gold from various feed materials. During the past year, two pilot-plant

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Rapid solvent extraction of gold(III) with high molecular ...

2017-8-29  Solvent extraction of gold(III) by the chloride salt of the tertiary amine Hostarex A 327 (10) in n-decane has been studied. The extraction reaction is found to be exothermic and the extraction equilibrium depends on the ionic strength. Methods have been developed for the extraction of gold(III) with phosphorus-containing extractants such

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Chlorine ≥99.5% 7782-50-5

Chlorine gas has been used to generate chlorine atoms via photolysis for molecular halogen photochemical experiments. It can be used: As a reactant for the extraction of gold from an alluvial material via a pyrometallurgical process. To synthesize carbide

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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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Mechanism of selective gold extraction from multi-metal ...

The electrodeposition-redox replacement (EDRR) process is a promising method for a selective extraction of minor metals from complex mixtures. When it is performed in a benign medium (such as sodium chloride solution or deep eutectic solvent), the EDRR method provides a non-toxic alternative for a convention 2020 Green Chemistry Hot Articles

More

How does gold react with chlorine? Gold Refining

2008-7-26  In wiki under gold(III) chloride it says it can be made by direct chlorination at high temperatures, but on the same page it says that it begins to decompose above 160*C to form gold(I) chloride and chlorine. So does that mean that chlorine + gold at a temperature below 160*C will form...

More

Iron(II)-chloride for precipitation Gold Refining ...

2013-12-24  The two best known reagent to test gold in solution would be stannous chloride, and ferrous sulfate, the stannous chloride gives the violet color of colloidal gold purple of Cassius, the stannous chloride has s fairly short shelf life, especially depending on how it is made and stored, if stored in absence of air or oxygen, and with a piece of ...

More

Chemical feedbacks during magma degassing control

2021-3-19  For example, increasing melt chlorine concentration from 500 to 3000 ppm imparts an almost eight-fold increase in copper extraction efficiency (Fig. 4d); minor improvement (5–10% relative) in ...

More
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